1 /* subst.c -- The part of the shell that does parameter, command, arithmetic,
2 and globbing substitutions. */
4 /* ``Have a little faith, there's magic in the night. You ain't a
5 beauty, but, hey, you're alright.'' */
7 /* Copyright (C) 1987-2010 Free Software Foundation, Inc.
9 This file is part of GNU Bash, the Bourne Again SHell.
11 Bash is free software: you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation, either version 3 of the License, or
14 (at your option) any later version.
16 Bash is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with Bash. If not, see <http://www.gnu.org/licenses/>.
27 #include "bashtypes.h"
29 #include "chartypes.h"
30 #if defined (HAVE_PWD_H)
36 #if defined (HAVE_UNISTD_H)
41 #include "posixstat.h"
48 #include "execute_cmd.h"
52 #include "mailcheck.h"
57 #include "builtins/getopt.h"
58 #include "builtins/common.h"
60 #include "builtins/builtext.h"
62 #include <tilde/tilde.h>
63 #include <glob/strmatch.h>
69 /* The size that strings change by. */
70 #define DEFAULT_INITIAL_ARRAY_SIZE 112
71 #define DEFAULT_ARRAY_SIZE 128
77 #define VT_ARRAYMEMBER 3
80 #define VT_STARSUB 128 /* $* or ${array[*]} -- used to split */
82 /* Flags for quoted_strchr */
83 #define ST_BACKSL 0x01
84 #define ST_CTLESC 0x02
85 #define ST_SQUOTE 0x04 /* unused yet */
86 #define ST_DQUOTE 0x08 /* unused yet */
88 /* Flags for the `pflags' argument to param_expand() */
89 #define PF_NOCOMSUB 0x01 /* Do not perform command substitution */
90 #define PF_IGNUNBOUND 0x02 /* ignore unbound vars even if -u set */
91 #define PF_NOSPLIT2 0x04 /* same as W_NOSPLIT2 */
93 /* These defs make it easier to use the editor. */
99 #if defined (HANDLE_MULTIBYTE)
104 /* Evaluates to 1 if C is one of the shell's special parameters whose length
105 can be taken, but is also one of the special expansion characters. */
106 #define VALID_SPECIAL_LENGTH_PARAM(c) \
107 ((c) == '-' || (c) == '?' || (c) == '#')
109 /* Evaluates to 1 if C is one of the shell's special parameters for which an
110 indirect variable reference may be made. */
111 #define VALID_INDIR_PARAM(c) \
112 ((posixly_correct == 0 && (c) == '#') || (posixly_correct == 0 && (c) == '?') || (c) == '@' || (c) == '*')
114 /* Evaluates to 1 if C is one of the OP characters that follows the parameter
115 in ${parameter[:]OPword}. */
116 #define VALID_PARAM_EXPAND_CHAR(c) (sh_syntaxtab[(unsigned char)c] & CSUBSTOP)
118 /* Evaluates to 1 if this is one of the shell's special variables. */
119 #define SPECIAL_VAR(name, wi) \
120 ((DIGIT (*name) && all_digits (name)) || \
121 (name[1] == '\0' && (sh_syntaxtab[(unsigned char)*name] & CSPECVAR)) || \
122 (wi && name[2] == '\0' && VALID_INDIR_PARAM (name[1])))
124 /* An expansion function that takes a string and a quoted flag and returns
125 a WORD_LIST *. Used as the type of the third argument to
126 expand_string_if_necessary(). */
127 typedef WORD_LIST *EXPFUNC __P((char *, int));
129 /* Process ID of the last command executed within command substitution. */
130 pid_t last_command_subst_pid = NO_PID;
131 pid_t current_command_subst_pid = NO_PID;
133 /* Variables used to keep track of the characters in IFS. */
136 unsigned char ifs_cmap[UCHAR_MAX + 1];
138 #if defined (HANDLE_MULTIBYTE)
139 unsigned char ifs_firstc[MB_LEN_MAX];
140 size_t ifs_firstc_len;
142 unsigned char ifs_firstc;
145 /* Sentinel to tell when we are performing variable assignments preceding a
146 command name and putting them into the environment. Used to make sure
147 we use the temporary environment when looking up variable values. */
148 int assigning_in_environment;
150 /* Used to hold a list of variable assignments preceding a command. Global
151 so the SIGCHLD handler in jobs.c can unwind-protect it when it runs a
152 SIGCHLD trap and so it can be saved and restored by the trap handlers. */
153 WORD_LIST *subst_assign_varlist = (WORD_LIST *)NULL;
155 /* Extern functions and variables from different files. */
156 extern int last_command_exit_value, last_command_exit_signal;
157 extern int subshell_environment, line_number;
158 extern int subshell_level, parse_and_execute_level, sourcelevel;
159 extern int eof_encountered;
160 extern int return_catch_flag, return_catch_value;
161 extern pid_t dollar_dollar_pid;
162 extern int posixly_correct;
163 extern char *this_command_name;
164 extern struct fd_bitmap *current_fds_to_close;
165 extern int wordexp_only;
166 extern int expanding_redir;
167 extern int tempenv_assign_error;
169 #if !defined (HAVE_WCSDUP) && defined (HANDLE_MULTIBYTE)
170 extern wchar_t *wcsdup __P((const wchar_t *));
173 /* Non-zero means to allow unmatched globbed filenames to expand to
175 int allow_null_glob_expansion;
177 /* Non-zero means to throw an error when globbing fails to match anything. */
178 int fail_glob_expansion;
181 /* Variables to keep track of which words in an expanded word list (the
182 output of expand_word_list_internal) are the result of globbing
183 expansions. GLOB_ARGV_FLAGS is used by execute_cmd.c.
184 (CURRENTLY UNUSED). */
185 char *glob_argv_flags;
186 static int glob_argv_flags_size;
189 static WORD_LIST expand_word_error, expand_word_fatal;
190 static WORD_DESC expand_wdesc_error, expand_wdesc_fatal;
191 static char expand_param_error, expand_param_fatal;
192 static char extract_string_error, extract_string_fatal;
194 /* Tell the expansion functions to not longjmp back to top_level on fatal
195 errors. Enabled when doing completion and prompt string expansion. */
196 static int no_longjmp_on_fatal_error = 0;
198 /* Set by expand_word_unsplit; used to inhibit splitting and re-joining
199 $* on $IFS, primarily when doing assignment statements. */
200 static int expand_no_split_dollar_star = 0;
202 /* A WORD_LIST of words to be expanded by expand_word_list_internal,
203 without any leading variable assignments. */
204 static WORD_LIST *garglist = (WORD_LIST *)NULL;
206 static char *quoted_substring __P((char *, int, int));
207 static int quoted_strlen __P((char *));
208 static char *quoted_strchr __P((char *, int, int));
210 static char *expand_string_if_necessary __P((char *, int, EXPFUNC *));
211 static inline char *expand_string_to_string_internal __P((char *, int, EXPFUNC *));
212 static WORD_LIST *call_expand_word_internal __P((WORD_DESC *, int, int, int *, int *));
213 static WORD_LIST *expand_string_internal __P((char *, int));
214 static WORD_LIST *expand_string_leave_quoted __P((char *, int));
215 static WORD_LIST *expand_string_for_rhs __P((char *, int, int *, int *));
217 static WORD_LIST *list_quote_escapes __P((WORD_LIST *));
218 static char *make_quoted_char __P((int));
219 static WORD_LIST *quote_list __P((WORD_LIST *));
221 static int unquoted_substring __P((char *, char *));
222 static int unquoted_member __P((int, char *));
224 #if defined (ARRAY_VARS)
225 static SHELL_VAR *do_compound_assignment __P((char *, char *, int));
227 static int do_assignment_internal __P((const WORD_DESC *, int));
229 static char *string_extract_verbatim __P((char *, size_t, int *, char *, int));
230 static char *string_extract __P((char *, int *, char *, int));
231 static char *string_extract_double_quoted __P((char *, int *, int));
232 static inline char *string_extract_single_quoted __P((char *, int *));
233 static inline int skip_single_quoted __P((const char *, size_t, int));
234 static int skip_double_quoted __P((char *, size_t, int));
235 static char *extract_delimited_string __P((char *, int *, char *, char *, char *, int));
236 static char *extract_dollar_brace_string __P((char *, int *, int, int));
237 static int skip_matched_pair __P((const char *, int, int, int, int));
239 static char *pos_params __P((char *, int, int, int));
241 static unsigned char *mb_getcharlens __P((char *, int));
243 static char *remove_upattern __P((char *, char *, int));
244 #if defined (HANDLE_MULTIBYTE)
245 static wchar_t *remove_wpattern __P((wchar_t *, size_t, wchar_t *, int));
247 static char *remove_pattern __P((char *, char *, int));
249 static int match_upattern __P((char *, char *, int, char **, char **));
250 #if defined (HANDLE_MULTIBYTE)
251 static int match_wpattern __P((wchar_t *, char **, size_t, wchar_t *, int, char **, char **));
253 static int match_pattern __P((char *, char *, int, char **, char **));
254 static int getpatspec __P((int, char *));
255 static char *getpattern __P((char *, int, int));
256 static char *variable_remove_pattern __P((char *, char *, int, int));
257 static char *list_remove_pattern __P((WORD_LIST *, char *, int, int, int));
258 static char *parameter_list_remove_pattern __P((int, char *, int, int));
260 static char *array_remove_pattern __P((SHELL_VAR *, char *, int, char *, int));
262 static char *parameter_brace_remove_pattern __P((char *, char *, int, char *, int, int, int));
264 static char *process_substitute __P((char *, int));
266 static char *read_comsub __P((int, int, int *));
269 static arrayind_t array_length_reference __P((char *));
272 static int valid_brace_expansion_word __P((char *, int));
273 static int chk_atstar __P((char *, int, int *, int *));
274 static int chk_arithsub __P((const char *, int));
276 static WORD_DESC *parameter_brace_expand_word __P((char *, int, int, int, arrayind_t *));
277 static WORD_DESC *parameter_brace_expand_indir __P((char *, int, int, int *, int *));
278 static WORD_DESC *parameter_brace_expand_rhs __P((char *, char *, int, int, int *, int *));
279 static void parameter_brace_expand_error __P((char *, char *));
281 static int valid_length_expression __P((char *));
282 static intmax_t parameter_brace_expand_length __P((char *));
284 static char *skiparith __P((char *, int));
285 static int verify_substring_values __P((SHELL_VAR *, char *, char *, int, intmax_t *, intmax_t *));
286 static int get_var_and_type __P((char *, char *, arrayind_t, int, int, SHELL_VAR **, char **));
287 static char *mb_substring __P((char *, int, int));
288 static char *parameter_brace_substring __P((char *, char *, int, char *, int, int));
290 static int shouldexp_replacement __P((char *));
292 static char *pos_params_pat_subst __P((char *, char *, char *, int));
294 static char *parameter_brace_patsub __P((char *, char *, int, char *, int, int));
296 static char *pos_params_casemod __P((char *, char *, int, int));
297 static char *parameter_brace_casemod __P((char *, char *, int, int, char *, int, int));
299 static WORD_DESC *parameter_brace_expand __P((char *, int *, int, int, int *, int *));
300 static WORD_DESC *param_expand __P((char *, int *, int, int *, int *, int *, int *, int));
302 static WORD_LIST *expand_word_internal __P((WORD_DESC *, int, int, int *, int *));
304 static WORD_LIST *word_list_split __P((WORD_LIST *));
306 static void exp_jump_to_top_level __P((int));
308 static WORD_LIST *separate_out_assignments __P((WORD_LIST *));
309 static WORD_LIST *glob_expand_word_list __P((WORD_LIST *, int));
310 #ifdef BRACE_EXPANSION
311 static WORD_LIST *brace_expand_word_list __P((WORD_LIST *, int));
313 #if defined (ARRAY_VARS)
314 static int make_internal_declare __P((char *, char *));
316 static WORD_LIST *shell_expand_word_list __P((WORD_LIST *, int));
317 static WORD_LIST *expand_word_list_internal __P((WORD_LIST *, int));
319 /* **************************************************************** */
321 /* Utility Functions */
323 /* **************************************************************** */
327 dump_word_flags (flags)
333 fprintf (stderr, "%d -> ", f);
334 if (f & W_ASSIGNASSOC)
337 fprintf (stderr, "W_ASSIGNASSOC%s", f ? "|" : "");
342 fprintf (stderr, "W_HASCTLESC%s", f ? "|" : "");
347 fprintf (stderr, "W_NOPROCSUB%s", f ? "|" : "");
352 fprintf (stderr, "W_DQUOTE%s", f ? "|" : "");
354 if (f & W_HASQUOTEDNULL)
356 f &= ~W_HASQUOTEDNULL;
357 fprintf (stderr, "W_HASQUOTEDNULL%s", f ? "|" : "");
362 fprintf (stderr, "W_ASSIGNARG%s", f ? "|" : "");
367 fprintf (stderr, "W_ASSNBLTIN%s", f ? "|" : "");
369 if (f & W_ASSNGLOBAL)
372 fprintf (stderr, "W_ASSNGLOBAL%s", f ? "|" : "");
374 if (f & W_COMPASSIGN)
377 fprintf (stderr, "W_COMPASSIGN%s", f ? "|" : "");
382 fprintf (stderr, "W_NOEXPAND%s", f ? "|" : "");
387 fprintf (stderr, "W_ITILDE%s", f ? "|" : "");
392 fprintf (stderr, "W_NOTILDE%s", f ? "|" : "");
397 fprintf (stderr, "W_ASSIGNRHS%s", f ? "|" : "");
402 fprintf (stderr, "W_NOCOMSUB%s", f ? "|" : "");
404 if (f & W_DOLLARSTAR)
407 fprintf (stderr, "W_DOLLARSTAR%s", f ? "|" : "");
412 fprintf (stderr, "W_DOLLARAT%s", f ? "|" : "");
417 fprintf (stderr, "W_TILDEEXP%s", f ? "|" : "");
422 fprintf (stderr, "W_NOSPLIT2%s", f ? "|" : "");
427 fprintf (stderr, "W_NOGLOB%s", f ? "|" : "");
432 fprintf (stderr, "W_NOSPLIT%s", f ? "|" : "");
437 fprintf (stderr, "W_GLOBEXP%s", f ? "|" : "");
439 if (f & W_ASSIGNMENT)
442 fprintf (stderr, "W_ASSIGNMENT%s", f ? "|" : "");
447 fprintf (stderr, "W_QUOTED%s", f ? "|" : "");
452 fprintf (stderr, "W_HASDOLLAR%s", f ? "|" : "");
454 fprintf (stderr, "\n");
459 #ifdef INCLUDE_UNUSED
461 quoted_substring (string, start, end)
466 register char *result, *s, *r;
470 /* Move to string[start], skipping quoted characters. */
471 for (s = string, l = 0; *s && l < start; )
483 r = result = (char *)xmalloc (2*len + 1); /* save room for quotes */
485 /* Copy LEN characters, including quote characters. */
487 for (l = 0; l < len; s++)
501 #ifdef INCLUDE_UNUSED
502 /* Return the length of S, skipping over quoted characters */
526 /* Find the first occurrence of character C in string S, obeying shell
527 quoting rules. If (FLAGS & ST_BACKSL) is non-zero, backslash-escaped
528 characters are skipped. If (FLAGS & ST_CTLESC) is non-zero, characters
529 escaped with CTLESC are skipped. */
531 quoted_strchr (s, c, flags)
539 if (((flags & ST_BACKSL) && *p == '\\')
540 || ((flags & ST_CTLESC) && *p == CTLESC))
544 return ((char *)NULL);
550 return ((char *)NULL);
553 /* Return 1 if CHARACTER appears in an unquoted portion of
554 STRING. Return 0 otherwise. CHARACTER must be a single-byte character. */
556 unquoted_member (character, string)
564 slen = strlen (string);
566 while (c = string[sindex])
574 ADVANCE_CHAR (string, slen, sindex);
580 ADVANCE_CHAR (string, slen, sindex);
584 sindex = skip_single_quoted (string, slen, ++sindex);
588 sindex = skip_double_quoted (string, slen, ++sindex);
595 /* Return 1 if SUBSTR appears in an unquoted portion of STRING. */
597 unquoted_substring (substr, string)
598 char *substr, *string;
601 int sindex, c, sublen;
604 if (substr == 0 || *substr == '\0')
607 slen = strlen (string);
608 sublen = strlen (substr);
609 for (sindex = 0; c = string[sindex]; )
611 if (STREQN (string + sindex, substr, sublen))
619 ADVANCE_CHAR (string, slen, sindex);
623 sindex = skip_single_quoted (string, slen, ++sindex);
627 sindex = skip_double_quoted (string, slen, ++sindex);
631 ADVANCE_CHAR (string, slen, sindex);
638 /* Most of the substitutions must be done in parallel. In order
639 to avoid using tons of unclear goto's, I have some functions
640 for manipulating malloc'ed strings. They all take INDX, a
641 pointer to an integer which is the offset into the string
642 where manipulation is taking place. They also take SIZE, a
643 pointer to an integer which is the current length of the
644 character array for this string. */
646 /* Append SOURCE to TARGET at INDEX. SIZE is the current amount
647 of space allocated to TARGET. SOURCE can be NULL, in which
648 case nothing happens. Gets rid of SOURCE by freeing it.
649 Returns TARGET in case the location has changed. */
651 sub_append_string (source, target, indx, size)
652 char *source, *target;
659 srclen = STRLEN (source);
660 if (srclen >= (int)(*size - *indx))
663 n = (n + DEFAULT_ARRAY_SIZE) - (n % DEFAULT_ARRAY_SIZE);
664 target = (char *)xrealloc (target, (*size = n));
667 FASTCOPY (source, target + *indx, srclen);
669 target[*indx] = '\0';
678 /* Append the textual representation of NUMBER to TARGET.
679 INDX and SIZE are as in SUB_APPEND_STRING. */
681 sub_append_number (number, target, indx, size)
688 temp = itos (number);
689 return (sub_append_string (temp, target, indx, size));
693 /* Extract a substring from STRING, starting at SINDEX and ending with
694 one of the characters in CHARLIST. Don't make the ending character
695 part of the string. Leave SINDEX pointing at the ending character.
696 Understand about backslashes in the string. If (flags & SX_VARNAME)
697 is non-zero, and array variables have been compiled into the shell,
698 everything between a `[' and a corresponding `]' is skipped over.
699 If (flags & SX_NOALLOC) is non-zero, don't return the substring, just
700 update SINDEX. If (flags & SX_REQMATCH) is non-zero, the string must
701 contain a closing character from CHARLIST. */
703 string_extract (string, sindex, charlist, flags)
715 slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 0;
718 while (c = string[i])
727 #if defined (ARRAY_VARS)
728 else if ((flags & SX_VARNAME) && c == '[')
731 /* If this is an array subscript, skip over it and continue. */
732 ni = skipsubscript (string, i, 0);
733 if (string[ni] == ']')
737 else if (MEMBER (c, charlist))
743 ADVANCE_CHAR (string, slen, i);
746 /* If we had to have a matching delimiter and didn't find one, return an
747 error and let the caller deal with it. */
748 if ((flags & SX_REQMATCH) && found == 0)
751 return (&extract_string_error);
754 temp = (flags & SX_NOALLOC) ? (char *)NULL : substring (string, *sindex, i);
760 /* Extract the contents of STRING as if it is enclosed in double quotes.
761 SINDEX, when passed in, is the offset of the character immediately
762 following the opening double quote; on exit, SINDEX is left pointing after
763 the closing double quote. If STRIPDQ is non-zero, unquoted double
764 quotes are stripped and the string is terminated by a null byte.
765 Backslashes between the embedded double quotes are processed. If STRIPDQ
766 is zero, an unquoted `"' terminates the string. */
768 string_extract_double_quoted (string, sindex, stripdq)
770 int *sindex, stripdq;
776 char *temp, *ret; /* The new string we return. */
777 int pass_next, backquote, si; /* State variables for the machine. */
781 slen = strlen (string + *sindex) + *sindex;
782 send = string + slen;
784 pass_next = backquote = dquote = 0;
785 temp = (char *)xmalloc (1 + slen - *sindex);
789 while (c = string[i])
791 /* Process a character that was quoted by a backslash. */
794 /* XXX - take another look at this in light of Interp 221 */
797 ``The backslash shall retain its special meaning as an escape
798 character only when followed by one of the characters:
801 If STRIPDQ is zero, we handle the double quotes here and let
802 expand_word_internal handle the rest. If STRIPDQ is non-zero,
803 we have already been through one round of backslash stripping,
804 and want to strip these backslashes only if DQUOTE is non-zero,
805 indicating that we are inside an embedded double-quoted string. */
807 /* If we are in an embedded quoted string, then don't strip
808 backslashes before characters for which the backslash
809 retains its special meaning, but remove backslashes in
810 front of other characters. If we are not in an
811 embedded quoted string, don't strip backslashes at all.
812 This mess is necessary because the string was already
813 surrounded by double quotes (and sh has some really weird
815 The returned string will be run through expansion as if
816 it were double-quoted. */
817 if ((stripdq == 0 && c != '"') ||
818 (stripdq && ((dquote && (sh_syntaxtab[c] & CBSDQUOTE)) || dquote == 0)))
823 COPY_CHAR_I (temp, j, string, send, i);
827 /* A backslash protects the next character. The code just above
828 handles preserving the backslash in front of any character but
837 /* Inside backquotes, ``the portion of the quoted string from the
838 initial backquote and the characters up to the next backquote
839 that is not preceded by a backslash, having escape characters
840 removed, defines that command''. */
858 /* Pass everything between `$(' and the matching `)' or a quoted
859 ${ ... } pair through according to the Posix.2 specification. */
860 if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE)))
865 if (string[i + 1] == LPAREN)
866 ret = extract_command_subst (string, &si, 0);
868 ret = extract_dollar_brace_string (string, &si, Q_DOUBLE_QUOTES, 0);
871 temp[j++] = string[i + 1];
873 /* Just paranoia; ret will not be 0 unless no_longjmp_on_fatal_error
875 if (ret == 0 && no_longjmp_on_fatal_error)
878 ret = string + i + 2;
881 for (t = 0; ret[t]; t++, j++)
883 temp[j] = string[si];
898 /* Add any character but a double quote to the quoted string we're
901 goto add_one_character;
915 /* Point to after the closing quote. */
923 /* This should really be another option to string_extract_double_quoted. */
925 skip_double_quoted (string, slen, sind)
932 int pass_next, backquote, si;
935 pass_next = backquote = 0;
937 while (c = string[i])
942 ADVANCE_CHAR (string, slen, i);
955 ADVANCE_CHAR (string, slen, i);
964 else if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE)))
967 if (string[i + 1] == LPAREN)
968 ret = extract_command_subst (string, &si, SX_NOALLOC);
970 ret = extract_dollar_brace_string (string, &si, Q_DOUBLE_QUOTES, SX_NOALLOC);
977 ADVANCE_CHAR (string, slen, i);
990 /* Extract the contents of STRING as if it is enclosed in single quotes.
991 SINDEX, when passed in, is the offset of the character immediately
992 following the opening single quote; on exit, SINDEX is left pointing after
993 the closing single quote. */
995 string_extract_single_quoted (string, sindex)
1004 /* Don't need slen for ADVANCE_CHAR unless multibyte chars possible. */
1005 slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 0;
1007 while (string[i] && string[i] != '\'')
1008 ADVANCE_CHAR (string, slen, i);
1010 t = substring (string, *sindex, i);
1020 skip_single_quoted (string, slen, sind)
1029 while (string[c] && string[c] != '\'')
1030 ADVANCE_CHAR (string, slen, c);
1037 /* Just like string_extract, but doesn't hack backslashes or any of
1038 that other stuff. Obeys CTLESC quoting. Used to do splitting on $IFS. */
1040 string_extract_verbatim (string, slen, sindex, charlist, flags)
1048 #if defined (HANDLE_MULTIBYTE)
1056 if (charlist[0] == '\'' && charlist[1] == '\0')
1058 temp = string_extract_single_quoted (string, sindex);
1059 --*sindex; /* leave *sindex at separator character */
1065 /* See how the MBLEN and ADVANCE_CHAR macros work to understand why we need
1066 this only if MB_CUR_MAX > 1. */
1067 slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 1;
1069 #if defined (HANDLE_MULTIBYTE)
1070 clen = strlen (charlist);
1073 while (c = string[i])
1075 #if defined (HANDLE_MULTIBYTE)
1078 if ((flags & SX_NOCTLESC) == 0 && c == CTLESC)
1083 /* Even if flags contains SX_NOCTLESC, we let CTLESC quoting CTLNUL
1084 through, to protect the CTLNULs from later calls to
1085 remove_quoted_nulls. */
1086 else if ((flags & SX_NOESCCTLNUL) == 0 && c == CTLESC && string[i+1] == CTLNUL)
1092 #if defined (HANDLE_MULTIBYTE)
1093 mblength = MBLEN (string + i, slen - i);
1097 mblength = mbtowc (&wc, string + i, slen - i);
1098 if (MB_INVALIDCH (mblength))
1100 if (MEMBER (c, charlist))
1108 len = mbstowcs (wcharlist, charlist, 0);
1111 wcharlist = (wchar_t *)xmalloc (sizeof (wchar_t) * (len + 1));
1112 mbstowcs (wcharlist, charlist, len + 1);
1115 if (wcschr (wcharlist, wc))
1121 if (MEMBER (c, charlist))
1124 ADVANCE_CHAR (string, slen, i);
1127 #if defined (HANDLE_MULTIBYTE)
1131 temp = substring (string, *sindex, i);
1137 /* Extract the $( construct in STRING, and return a new string.
1138 Start extracting at (SINDEX) as if we had just seen "$(".
1139 Make (SINDEX) get the position of the matching ")". )
1140 XFLAGS is additional flags to pass to other extraction functions. */
1142 extract_command_subst (string, sindex, xflags)
1147 if (string[*sindex] == LPAREN)
1148 return (extract_delimited_string (string, sindex, "$(", "(", ")", xflags|SX_COMMAND)); /*)*/
1151 xflags |= (no_longjmp_on_fatal_error ? SX_NOLONGJMP : 0);
1152 return (xparse_dolparen (string, string+*sindex, sindex, xflags));
1156 /* Extract the $[ construct in STRING, and return a new string. (])
1157 Start extracting at (SINDEX) as if we had just seen "$[".
1158 Make (SINDEX) get the position of the matching "]". */
1160 extract_arithmetic_subst (string, sindex)
1164 return (extract_delimited_string (string, sindex, "$[", "[", "]", 0)); /*]*/
1167 #if defined (PROCESS_SUBSTITUTION)
1168 /* Extract the <( or >( construct in STRING, and return a new string.
1169 Start extracting at (SINDEX) as if we had just seen "<(".
1170 Make (SINDEX) get the position of the matching ")". */ /*))*/
1172 extract_process_subst (string, starter, sindex)
1177 return (extract_delimited_string (string, sindex, starter, "(", ")", 0));
1179 #endif /* PROCESS_SUBSTITUTION */
1181 #if defined (ARRAY_VARS)
1182 /* This can be fooled by unquoted right parens in the passed string. If
1183 each caller verifies that the last character in STRING is a right paren,
1184 we don't even need to call extract_delimited_string. */
1186 extract_array_assignment_list (string, sindex)
1193 slen = strlen (string); /* ( */
1194 if (string[slen - 1] == ')')
1196 ret = substring (string, *sindex, slen - 1);
1204 /* Extract and create a new string from the contents of STRING, a
1205 character string delimited with OPENER and CLOSER. SINDEX is
1206 the address of an int describing the current offset in STRING;
1207 it should point to just after the first OPENER found. On exit,
1208 SINDEX gets the position of the last character of the matching CLOSER.
1209 If OPENER is more than a single character, ALT_OPENER, if non-null,
1210 contains a character string that can also match CLOSER and thus
1211 needs to be skipped. */
1213 extract_delimited_string (string, sindex, opener, alt_opener, closer, flags)
1216 char *opener, *alt_opener, *closer;
1222 int pass_character, nesting_level, in_comment;
1223 int len_closer, len_opener, len_alt_opener;
1226 slen = strlen (string + *sindex) + *sindex;
1227 len_opener = STRLEN (opener);
1228 len_alt_opener = STRLEN (alt_opener);
1229 len_closer = STRLEN (closer);
1231 pass_character = in_comment = 0;
1236 while (nesting_level)
1247 ADVANCE_CHAR (string, slen, i);
1251 if (pass_character) /* previous char was backslash */
1254 ADVANCE_CHAR (string, slen, i);
1258 /* Not exactly right yet; should handle shell metacharacters and
1259 multibyte characters, too. See COMMENT_BEGIN define in parse.y */
1260 if ((flags & SX_COMMAND) && c == '#' && (i == 0 || string[i - 1] == '\n' || shellblank (string[i - 1])))
1263 ADVANCE_CHAR (string, slen, i);
1267 if (c == CTLESC || c == '\\')
1274 /* Process a nested command substitution, but only if we're parsing an
1275 arithmetic substitution. */
1276 if ((flags & SX_COMMAND) && string[i] == '$' && string[i+1] == LPAREN)
1279 t = extract_command_subst (string, &si, flags|SX_NOALLOC);
1284 /* Process a nested OPENER. */
1285 if (STREQN (string + i, opener, len_opener))
1287 si = i + len_opener;
1288 t = extract_delimited_string (string, &si, opener, alt_opener, closer, flags|SX_NOALLOC);
1293 /* Process a nested ALT_OPENER */
1294 if (len_alt_opener && STREQN (string + i, alt_opener, len_alt_opener))
1296 si = i + len_alt_opener;
1297 t = extract_delimited_string (string, &si, alt_opener, alt_opener, closer, flags|SX_NOALLOC);
1302 /* If the current substring terminates the delimited string, decrement
1303 the nesting level. */
1304 if (STREQN (string + i, closer, len_closer))
1306 i += len_closer - 1; /* move to last byte of the closer */
1308 if (nesting_level == 0)
1312 /* Pass old-style command substitution through verbatim. */
1316 t = string_extract (string, &si, "`", flags|SX_NOALLOC);
1321 /* Pass single-quoted and double-quoted strings through verbatim. */
1322 if (c == '\'' || c == '"')
1325 i = (c == '\'') ? skip_single_quoted (string, slen, si)
1326 : skip_double_quoted (string, slen, si);
1330 /* move past this character, which was not special. */
1331 ADVANCE_CHAR (string, slen, i);
1334 if (c == 0 && nesting_level)
1336 if (no_longjmp_on_fatal_error == 0)
1338 report_error (_("bad substitution: no closing `%s' in %s"), closer, string);
1339 last_command_exit_value = EXECUTION_FAILURE;
1340 exp_jump_to_top_level (DISCARD);
1345 return (char *)NULL;
1349 si = i - *sindex - len_closer + 1;
1350 if (flags & SX_NOALLOC)
1351 result = (char *)NULL;
1354 result = (char *)xmalloc (1 + si);
1355 strncpy (result, string + *sindex, si);
1363 /* Extract a parameter expansion expression within ${ and } from STRING.
1364 Obey the Posix.2 rules for finding the ending `}': count braces while
1365 skipping over enclosed quoted strings and command substitutions.
1366 SINDEX is the address of an int describing the current offset in STRING;
1367 it should point to just after the first `{' found. On exit, SINDEX
1368 gets the position of the matching `}'. QUOTED is non-zero if this
1369 occurs inside double quotes. */
1370 /* XXX -- this is very similar to extract_delimited_string -- XXX */
1372 extract_dollar_brace_string (string, sindex, quoted, flags)
1374 int *sindex, quoted, flags;
1378 int pass_character, nesting_level, si, dolbrace_state;
1384 slen = strlen (string + *sindex) + *sindex;
1386 /* The handling of dolbrace_state needs to agree with the code in parse.y:
1387 parse_matched_pair(). The different initial value is to handle the
1388 case where this function is called to parse the word in
1389 ${param op word} (SX_WORD). */
1390 dolbrace_state = (flags & SX_WORD) ? DOLBRACE_WORD : DOLBRACE_PARAM;
1391 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && (flags & SX_POSIXEXP))
1392 dolbrace_state = DOLBRACE_QUOTE;
1395 while (c = string[i])
1400 ADVANCE_CHAR (string, slen, i);
1404 /* CTLESCs and backslashes quote the next character. */
1405 if (c == CTLESC || c == '\\')
1412 if (string[i] == '$' && string[i+1] == LBRACE)
1422 if (nesting_level == 0)
1428 /* Pass the contents of old-style command substitutions through
1433 t = string_extract (string, &si, "`", flags|SX_NOALLOC);
1438 /* Pass the contents of new-style command substitutions and
1439 arithmetic substitutions through verbatim. */
1440 if (string[i] == '$' && string[i+1] == LPAREN)
1443 t = extract_command_subst (string, &si, flags|SX_NOALLOC);
1449 /* Pass the contents of single-quoted and double-quoted strings
1450 through verbatim. */
1451 if (c == '\'' || c == '"')
1454 i = (c == '\'') ? skip_single_quoted (string, slen, si)
1455 : skip_double_quoted (string, slen, si);
1456 /* skip_XXX_quoted leaves index one past close quote */
1459 #else /* XXX - bash-4.2 */
1460 /* Pass the contents of double-quoted strings through verbatim. */
1464 i = skip_double_quoted (string, slen, si);
1465 /* skip_XXX_quoted leaves index one past close quote */
1471 /*itrace("extract_dollar_brace_string: c == single quote flags = %d quoted = %d dolbrace_state = %d", flags, quoted, dolbrace_state);*/
1472 if (posixly_correct && shell_compatibility_level > 41 && dolbrace_state != DOLBRACE_QUOTE && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
1473 ADVANCE_CHAR (string, slen, i);
1477 i = skip_single_quoted (string, slen, si);
1484 /* move past this character, which was not special. */
1485 ADVANCE_CHAR (string, slen, i);
1487 /* This logic must agree with parse.y:parse_matched_pair, since they
1488 share the same defines. */
1489 if (dolbrace_state == DOLBRACE_PARAM && c == '%' && (i - *sindex) > 1)
1490 dolbrace_state = DOLBRACE_QUOTE;
1491 else if (dolbrace_state == DOLBRACE_PARAM && c == '#' && (i - *sindex) > 1)
1492 dolbrace_state = DOLBRACE_QUOTE;
1493 else if (dolbrace_state == DOLBRACE_PARAM && c == '/' && (i - *sindex) > 1)
1494 dolbrace_state = DOLBRACE_QUOTE;
1495 else if (dolbrace_state == DOLBRACE_PARAM && c == '^' && (i - *sindex) > 1)
1496 dolbrace_state = DOLBRACE_QUOTE;
1497 else if (dolbrace_state == DOLBRACE_PARAM && c == ',' && (i - *sindex) > 1)
1498 dolbrace_state = DOLBRACE_QUOTE;
1499 else if (dolbrace_state == DOLBRACE_PARAM && strchr ("#%^,~:-=?+/", c) != 0)
1500 dolbrace_state = DOLBRACE_OP;
1501 else if (dolbrace_state == DOLBRACE_OP && strchr ("#%^,~:-=?+/", c) == 0)
1502 dolbrace_state = DOLBRACE_WORD;
1505 if (c == 0 && nesting_level)
1507 if (no_longjmp_on_fatal_error == 0)
1509 report_error (_("bad substitution: no closing `%s' in %s"), "}", string);
1510 last_command_exit_value = EXECUTION_FAILURE;
1511 exp_jump_to_top_level (DISCARD);
1516 return ((char *)NULL);
1520 result = (flags & SX_NOALLOC) ? (char *)NULL : substring (string, *sindex, i);
1526 /* Remove backslashes which are quoting backquotes from STRING. Modifies
1527 STRING, and returns a pointer to it. */
1529 de_backslash (string)
1532 register size_t slen;
1533 register int i, j, prev_i;
1536 slen = strlen (string);
1539 /* Loop copying string[i] to string[j], i >= j. */
1542 if (string[i] == '\\' && (string[i + 1] == '`' || string[i + 1] == '\\' ||
1543 string[i + 1] == '$'))
1546 ADVANCE_CHAR (string, slen, i);
1548 do string[j++] = string[prev_i++]; while (prev_i < i);
1559 /* Replace instances of \! in a string with !. */
1561 unquote_bang (string)
1565 register char *temp;
1567 temp = (char *)xmalloc (1 + strlen (string));
1569 for (i = 0, j = 0; (temp[j] = string[i]); i++, j++)
1571 if (string[i] == '\\' && string[i + 1] == '!')
1577 strcpy (string, temp);
1582 #define CQ_RETURN(x) do { no_longjmp_on_fatal_error = 0; return (x); } while (0)
1584 /* This function assumes s[i] == open; returns with s[ret] == close; used to
1585 parse array subscripts. FLAGS & 1 means to not attempt to skip over
1586 matched pairs of quotes or backquotes, or skip word expansions; it is
1587 intended to be used after expansion has been performed and during final
1588 assignment parsing (see arrayfunc.c:assign_compound_array_list()). */
1590 skip_matched_pair (string, start, open, close, flags)
1592 int start, open, close, flags;
1594 int i, pass_next, backq, si, c, count;
1599 slen = strlen (string + start) + start;
1600 no_longjmp_on_fatal_error = 1;
1602 i = start + 1; /* skip over leading bracket */
1604 pass_next = backq = 0;
1605 ss = (char *)string;
1606 while (c = string[i])
1613 ADVANCE_CHAR (string, slen, i);
1626 ADVANCE_CHAR (string, slen, i);
1629 else if ((flags & 1) == 0 && c == '`')
1635 else if ((flags & 1) == 0 && c == open)
1641 else if (c == close)
1649 else if ((flags & 1) == 0 && (c == '\'' || c == '"'))
1651 i = (c == '\'') ? skip_single_quoted (ss, slen, ++i)
1652 : skip_double_quoted (ss, slen, ++i);
1653 /* no increment, the skip functions increment past the closing quote. */
1655 else if ((flags&1) == 0 && c == '$' && (string[i+1] == LPAREN || string[i+1] == LBRACE))
1658 if (string[si] == '\0')
1661 if (string[i+1] == LPAREN)
1662 temp = extract_delimited_string (ss, &si, "$(", "(", ")", SX_NOALLOC|SX_COMMAND); /* ) */
1664 temp = extract_dollar_brace_string (ss, &si, 0, SX_NOALLOC);
1666 if (string[i] == '\0') /* don't increment i past EOS in loop */
1672 ADVANCE_CHAR (string, slen, i);
1678 #if defined (ARRAY_VARS)
1680 skipsubscript (string, start, flags)
1684 return (skip_matched_pair (string, start, '[', ']', flags));
1688 /* Skip characters in STRING until we find a character in DELIMS, and return
1689 the index of that character. START is the index into string at which we
1690 begin. This is similar in spirit to strpbrk, but it returns an index into
1691 STRING and takes a starting index. This little piece of code knows quite
1692 a lot of shell syntax. It's very similar to skip_double_quoted and other
1693 functions of that ilk. */
1695 skip_to_delim (string, start, delims, flags)
1701 int i, pass_next, backq, si, c, invert, skipquote, skipcmd;
1703 char *temp, open[3];
1706 slen = strlen (string + start) + start;
1707 if (flags & SD_NOJMP)
1708 no_longjmp_on_fatal_error = 1;
1709 invert = (flags & SD_INVERT);
1710 skipcmd = (flags & SD_NOSKIPCMD) == 0;
1713 pass_next = backq = 0;
1714 while (c = string[i])
1716 /* If this is non-zero, we should not let quote characters be delimiters
1717 and the current character is a single or double quote. We should not
1718 test whether or not it's a delimiter until after we skip single- or
1719 double-quoted strings. */
1720 skipquote = ((flags & SD_NOQUOTEDELIM) && (c == '\'' || c =='"'));
1726 ADVANCE_CHAR (string, slen, i);
1739 ADVANCE_CHAR (string, slen, i);
1748 else if (skipquote == 0 && invert == 0 && member (c, delims))
1750 else if (c == '\'' || c == '"')
1752 i = (c == '\'') ? skip_single_quoted (string, slen, ++i)
1753 : skip_double_quoted (string, slen, ++i);
1754 /* no increment, the skip functions increment past the closing quote. */
1756 else if (c == '$' && ((skipcmd && string[i+1] == LPAREN) || string[i+1] == LBRACE))
1759 if (string[si] == '\0')
1762 if (string[i+1] == LPAREN)
1763 temp = extract_delimited_string (string, &si, "$(", "(", ")", SX_NOALLOC|SX_COMMAND); /* ) */
1765 temp = extract_dollar_brace_string (string, &si, 0, SX_NOALLOC);
1767 if (string[i] == '\0') /* don't increment i past EOS in loop */
1772 #if defined (PROCESS_SUBSTITUTION)
1773 else if (skipcmd && (c == '<' || c == '>') && string[i+1] == LPAREN)
1776 if (string[si] == '\0')
1778 temp = extract_process_subst (string, (c == '<') ? "<(" : ">(", &si);
1780 if (string[i] == '\0')
1785 #endif /* PROCESS_SUBSTITUTION */
1786 #if defined (EXTENDED_GLOB)
1787 else if ((flags & SD_EXTGLOB) && extended_glob && string[i+1] == LPAREN && member (c, "?*+!@"))
1790 if (string[si] == '\0')
1796 temp = extract_delimited_string (string, &si, open, "(", ")", SX_NOALLOC); /* ) */
1799 if (string[i] == '\0') /* don't increment i past EOS in loop */
1805 else if ((skipquote || invert) && (member (c, delims) == 0))
1808 ADVANCE_CHAR (string, slen, i);
1814 #if defined (READLINE)
1815 /* Return 1 if the portion of STRING ending at EINDEX is quoted (there is
1816 an unclosed quoted string), or if the character at EINDEX is quoted
1817 by a backslash. NO_LONGJMP_ON_FATAL_ERROR is used to flag that the various
1818 single and double-quoted string parsing functions should not return an
1819 error if there are unclosed quotes or braces. The characters that this
1820 recognizes need to be the same as the contents of
1821 rl_completer_quote_characters. */
1824 char_is_quoted (string, eindex)
1828 int i, pass_next, c;
1832 slen = strlen (string);
1833 no_longjmp_on_fatal_error = 1;
1842 if (i >= eindex) /* XXX was if (i >= eindex - 1) */
1844 ADVANCE_CHAR (string, slen, i);
1853 else if (c == '\'' || c == '"')
1855 i = (c == '\'') ? skip_single_quoted (string, slen, ++i)
1856 : skip_double_quoted (string, slen, ++i);
1859 /* no increment, the skip_xxx functions go one past end */
1862 ADVANCE_CHAR (string, slen, i);
1869 unclosed_pair (string, eindex, openstr)
1874 int i, pass_next, openc, olen;
1878 slen = strlen (string);
1879 olen = strlen (openstr);
1880 i = pass_next = openc = 0;
1886 if (i >= eindex) /* XXX was if (i >= eindex - 1) */
1888 ADVANCE_CHAR (string, slen, i);
1891 else if (string[i] == '\\')
1897 else if (STREQN (string + i, openstr, olen))
1902 else if (string[i] == '\'' || string[i] == '"')
1904 i = (string[i] == '\'') ? skip_single_quoted (string, slen, i)
1905 : skip_double_quoted (string, slen, i);
1910 ADVANCE_CHAR (string, slen, i);
1915 /* Split STRING (length SLEN) at DELIMS, and return a WORD_LIST with the
1916 individual words. If DELIMS is NULL, the current value of $IFS is used
1917 to split the string, and the function follows the shell field splitting
1918 rules. SENTINEL is an index to look for. NWP, if non-NULL,
1919 gets the number of words in the returned list. CWP, if non-NULL, gets
1920 the index of the word containing SENTINEL. Non-whitespace chars in
1921 DELIMS delimit separate fields. */
1923 split_at_delims (string, slen, delims, sentinel, flags, nwp, cwp)
1927 int sentinel, flags;
1930 int ts, te, i, nw, cw, ifs_split, dflags;
1931 char *token, *d, *d2;
1932 WORD_LIST *ret, *tl;
1934 if (string == 0 || *string == '\0')
1940 return ((WORD_LIST *)NULL);
1943 d = (delims == 0) ? ifs_value : delims;
1944 ifs_split = delims == 0;
1946 /* Make d2 the non-whitespace characters in delims */
1951 #if defined (HANDLE_MULTIBYTE)
1952 size_t mblength = 1;
1956 slength = strlen (delims);
1957 d2 = (char *)xmalloc (slength + 1);
1961 #if defined (HANDLE_MULTIBYTE)
1962 mbstate_t state_bak;
1964 mblength = MBRLEN (delims + i, slength, &state);
1965 if (MB_INVALIDCH (mblength))
1967 else if (mblength > 1)
1969 memcpy (d2 + ts, delims + i, mblength);
1972 slength -= mblength;
1976 if (whitespace (delims[i]) == 0)
1977 d2[ts++] = delims[i];
1985 ret = (WORD_LIST *)NULL;
1987 /* Remove sequences of whitespace characters at the start of the string, as
1988 long as those characters are delimiters. */
1989 for (i = 0; member (string[i], d) && spctabnl (string[i]); i++)
1991 if (string[i] == '\0')
1997 dflags = flags|SD_NOJMP;
2000 te = skip_to_delim (string, ts, d, dflags);
2002 /* If we have a non-whitespace delimiter character, use it to make a
2003 separate field. This is just about what $IFS splitting does and
2004 is closer to the behavior of the shell parser. */
2005 if (ts == te && d2 && member (string[ts], d2))
2008 /* If we're using IFS splitting, the non-whitespace delimiter char
2009 and any additional IFS whitespace delimits a field. */
2011 while (member (string[te], d) && spctabnl (string[te]))
2014 while (member (string[te], d2))
2018 token = substring (string, ts, te);
2020 ret = add_string_to_list (token, ret);
2024 if (sentinel >= ts && sentinel <= te)
2027 /* If the cursor is at whitespace just before word start, set the
2028 sentinel word to the current word. */
2029 if (cwp && cw == -1 && sentinel == ts-1)
2032 /* If the cursor is at whitespace between two words, make a new, empty
2033 word, add it before (well, after, since the list is in reverse order)
2034 the word we just added, and set the current word to that one. */
2035 if (cwp && cw == -1 && sentinel < ts)
2037 tl = make_word_list (make_word (""), ret->next);
2043 if (string[te] == 0)
2047 while (member (string[i], d) && (ifs_split || spctabnl(string[i])))
2056 /* Special case for SENTINEL at the end of STRING. If we haven't found
2057 the word containing SENTINEL yet, and the index we're looking for is at
2058 the end of STRING (or past the end of the previously-found token,
2059 possible if the end of the line is composed solely of IFS whitespace)
2060 add an additional null argument and set the current word pointer to that. */
2061 if (cwp && cw == -1 && (sentinel >= slen || sentinel >= te))
2063 if (whitespace (string[sentinel - 1]))
2066 ret = add_string_to_list (token, ret);
2077 return (REVERSE_LIST (ret, WORD_LIST *));
2079 #endif /* READLINE */
2083 /* Extract the name of the variable to bind to from the assignment string. */
2085 assignment_name (string)
2091 offset = assignment (string, 0);
2093 return (char *)NULL;
2094 temp = substring (string, 0, offset);
2099 /* **************************************************************** */
2101 /* Functions to convert strings to WORD_LISTs and vice versa */
2103 /* **************************************************************** */
2105 /* Return a single string of all the words in LIST. SEP is the separator
2106 to put between individual elements of LIST in the output string. */
2108 string_list_internal (list, sep)
2112 register WORD_LIST *t;
2114 int word_len, sep_len, result_size;
2117 return ((char *)NULL);
2119 /* Short-circuit quickly if we don't need to separate anything. */
2120 if (list->next == 0)
2121 return (savestring (list->word->word));
2123 /* This is nearly always called with either sep[0] == 0 or sep[1] == 0. */
2124 sep_len = STRLEN (sep);
2127 for (t = list; t; t = t->next)
2130 result_size += sep_len;
2131 result_size += strlen (t->word->word);
2134 r = result = (char *)xmalloc (result_size + 1);
2136 for (t = list; t; t = t->next)
2138 if (t != list && sep_len)
2142 FASTCOPY (sep, r, sep_len);
2149 word_len = strlen (t->word->word);
2150 FASTCOPY (t->word->word, r, word_len);
2158 /* Return a single string of all the words present in LIST, separating
2159 each word with a space. */
2164 return (string_list_internal (list, " "));
2167 /* An external interface that can be used by the rest of the shell to
2168 obtain a string containing the first character in $IFS. Handles all
2169 the multibyte complications. If LENP is non-null, it is set to the
2170 length of the returned string. */
2172 ifs_firstchar (lenp)
2178 ret = xmalloc (MB_LEN_MAX + 1);
2179 #if defined (HANDLE_MULTIBYTE)
2180 if (ifs_firstc_len == 1)
2182 ret[0] = ifs_firstc[0];
2184 len = ret[0] ? 1 : 0;
2188 memcpy (ret, ifs_firstc, ifs_firstc_len);
2189 ret[len = ifs_firstc_len] = '\0';
2192 ret[0] = ifs_firstc;
2194 len = ret[0] ? 0 : 1;
2203 /* Return a single string of all the words present in LIST, obeying the
2204 quoting rules for "$*", to wit: (P1003.2, draft 11, 3.5.2) "If the
2205 expansion [of $*] appears within a double quoted string, it expands
2206 to a single field with the value of each parameter separated by the
2207 first character of the IFS variable, or by a <space> if IFS is unset." */
2209 string_list_dollar_star (list)
2213 #if defined (HANDLE_MULTIBYTE)
2214 # if defined (__GNUC__)
2215 char sep[MB_CUR_MAX + 1];
2223 #if defined (HANDLE_MULTIBYTE)
2224 # if !defined (__GNUC__)
2225 sep = (char *)xmalloc (MB_CUR_MAX + 1);
2226 # endif /* !__GNUC__ */
2227 if (ifs_firstc_len == 1)
2229 sep[0] = ifs_firstc[0];
2234 memcpy (sep, ifs_firstc, ifs_firstc_len);
2235 sep[ifs_firstc_len] = '\0';
2238 sep[0] = ifs_firstc;
2242 ret = string_list_internal (list, sep);
2243 #if defined (HANDLE_MULTIBYTE) && !defined (__GNUC__)
2249 /* Turn $@ into a string. If (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
2250 is non-zero, the $@ appears within double quotes, and we should quote
2251 the list before converting it into a string. If IFS is unset, and the
2252 word is not quoted, we just need to quote CTLESC and CTLNUL characters
2253 in the words in the list, because the default value of $IFS is
2254 <space><tab><newline>, IFS characters in the words in the list should
2255 also be split. If IFS is null, and the word is not quoted, we need
2256 to quote the words in the list to preserve the positional parameters
2259 string_list_dollar_at (list, quoted)
2264 #if defined (HANDLE_MULTIBYTE)
2265 # if defined (__GNUC__)
2266 char sep[MB_CUR_MAX + 1];
2269 # endif /* !__GNUC__ */
2275 /* XXX this could just be ifs = ifs_value; */
2276 ifs = ifs_var ? value_cell (ifs_var) : (char *)0;
2278 #if defined (HANDLE_MULTIBYTE)
2279 # if !defined (__GNUC__)
2280 sep = (char *)xmalloc (MB_CUR_MAX + 1);
2281 # endif /* !__GNUC__ */
2284 if (ifs_firstc_len == 1)
2286 sep[0] = ifs_firstc[0];
2291 memcpy (sep, ifs_firstc, ifs_firstc_len);
2292 sep[ifs_firstc_len] = '\0';
2301 sep[0] = (ifs == 0 || *ifs == 0) ? ' ' : *ifs;
2305 /* XXX -- why call quote_list if ifs == 0? we can get away without doing
2306 it now that quote_escapes quotes spaces */
2307 tlist = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES|Q_PATQUOTE))
2309 : list_quote_escapes (list);
2311 ret = string_list_internal (tlist, sep);
2312 #if defined (HANDLE_MULTIBYTE) && !defined (__GNUC__)
2318 /* Turn the positional paramters into a string, understanding quoting and
2319 the various subtleties of using the first character of $IFS as the
2320 separator. Calls string_list_dollar_at, string_list_dollar_star, and
2321 string_list as appropriate. */
2323 string_list_pos_params (pchar, list, quoted)
2331 if (pchar == '*' && (quoted & Q_DOUBLE_QUOTES))
2333 tlist = quote_list (list);
2334 word_list_remove_quoted_nulls (tlist);
2335 ret = string_list_dollar_star (tlist);
2337 else if (pchar == '*' && (quoted & Q_HERE_DOCUMENT))
2339 tlist = quote_list (list);
2340 word_list_remove_quoted_nulls (tlist);
2341 ret = string_list (tlist);
2343 else if (pchar == '*')
2345 /* Even when unquoted, string_list_dollar_star does the right thing
2346 making sure that the first character of $IFS is used as the
2348 ret = string_list_dollar_star (list);
2350 else if (pchar == '@' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
2351 /* We use string_list_dollar_at, but only if the string is quoted, since
2352 that quotes the escapes if it's not, which we don't want. We could
2353 use string_list (the old code did), but that doesn't do the right
2354 thing if the first character of $IFS is not a space. We use
2355 string_list_dollar_star if the string is unquoted so we make sure that
2356 the elements of $@ are separated by the first character of $IFS for
2358 ret = string_list_dollar_at (list, quoted);
2359 else if (pchar == '@')
2360 ret = string_list_dollar_star (list);
2362 ret = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (list) : list);
2367 /* Return the list of words present in STRING. Separate the string into
2368 words at any of the characters found in SEPARATORS. If QUOTED is
2369 non-zero then word in the list will have its quoted flag set, otherwise
2370 the quoted flag is left as make_word () deemed fit.
2372 This obeys the P1003.2 word splitting semantics. If `separators' is
2373 exactly <space><tab><newline>, then the splitting algorithm is that of
2374 the Bourne shell, which treats any sequence of characters from `separators'
2375 as a delimiter. If IFS is unset, which results in `separators' being set
2376 to "", no splitting occurs. If separators has some other value, the
2377 following rules are applied (`IFS white space' means zero or more
2378 occurrences of <space>, <tab>, or <newline>, as long as those characters
2379 are in `separators'):
2381 1) IFS white space is ignored at the start and the end of the
2383 2) Each occurrence of a character in `separators' that is not
2384 IFS white space, along with any adjacent occurrences of
2385 IFS white space delimits a field.
2386 3) Any nonzero-length sequence of IFS white space delimits a field.
2389 /* BEWARE! list_string strips null arguments. Don't call it twice and
2390 expect to have "" preserved! */
2392 /* This performs word splitting and quoted null character removal on
2395 (((separators)[0]) ? ((separators)[1] ? isifs(c) \
2396 : (c) == (separators)[0]) \
2400 list_string (string, separators, quoted)
2401 register char *string, *separators;
2406 char *current_word, *s;
2407 int sindex, sh_style_split, whitesep, xflags;
2410 if (!string || !*string)
2411 return ((WORD_LIST *)NULL);
2413 sh_style_split = separators && separators[0] == ' ' &&
2414 separators[1] == '\t' &&
2415 separators[2] == '\n' &&
2416 separators[3] == '\0';
2417 for (xflags = 0, s = ifs_value; s && *s; s++)
2419 if (*s == CTLESC) xflags |= SX_NOCTLESC;
2420 else if (*s == CTLNUL) xflags |= SX_NOESCCTLNUL;
2424 /* Remove sequences of whitespace at the beginning of STRING, as
2425 long as those characters appear in IFS. Do not do this if
2426 STRING is quoted or if there are no separator characters. */
2427 if (!quoted || !separators || !*separators)
2429 for (s = string; *s && spctabnl (*s) && issep (*s); s++);
2432 return ((WORD_LIST *)NULL);
2437 /* OK, now STRING points to a word that does not begin with white space.
2438 The splitting algorithm is:
2439 extract a word, stopping at a separator
2440 skip sequences of spc, tab, or nl as long as they are separators
2441 This obeys the field splitting rules in Posix.2. */
2442 slen = (MB_CUR_MAX > 1) ? strlen (string) : 1;
2443 for (result = (WORD_LIST *)NULL, sindex = 0; string[sindex]; )
2445 /* Don't need string length in ADVANCE_CHAR or string_extract_verbatim
2446 unless multibyte chars are possible. */
2447 current_word = string_extract_verbatim (string, slen, &sindex, separators, xflags);
2448 if (current_word == 0)
2451 /* If we have a quoted empty string, add a quoted null argument. We
2452 want to preserve the quoted null character iff this is a quoted
2453 empty string; otherwise the quoted null characters are removed
2455 if (QUOTED_NULL (current_word))
2457 t = alloc_word_desc ();
2458 t->word = make_quoted_char ('\0');
2459 t->flags |= W_QUOTED|W_HASQUOTEDNULL;
2460 result = make_word_list (t, result);
2462 else if (current_word[0] != '\0')
2464 /* If we have something, then add it regardless. However,
2465 perform quoted null character removal on the current word. */
2466 remove_quoted_nulls (current_word);
2467 result = add_string_to_list (current_word, result);
2468 result->word->flags &= ~W_HASQUOTEDNULL; /* just to be sure */
2469 if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))
2470 result->word->flags |= W_QUOTED;
2473 /* If we're not doing sequences of separators in the traditional
2474 Bourne shell style, then add a quoted null argument. */
2475 else if (!sh_style_split && !spctabnl (string[sindex]))
2477 t = alloc_word_desc ();
2478 t->word = make_quoted_char ('\0');
2479 t->flags |= W_QUOTED|W_HASQUOTEDNULL;
2480 result = make_word_list (t, result);
2483 free (current_word);
2485 /* Note whether or not the separator is IFS whitespace, used later. */
2486 whitesep = string[sindex] && spctabnl (string[sindex]);
2488 /* Move past the current separator character. */
2492 ADVANCE_CHAR (string, slen, sindex);
2495 /* Now skip sequences of space, tab, or newline characters if they are
2496 in the list of separators. */
2497 while (string[sindex] && spctabnl (string[sindex]) && issep (string[sindex]))
2500 /* If the first separator was IFS whitespace and the current character
2501 is a non-whitespace IFS character, it should be part of the current
2502 field delimiter, not a separate delimiter that would result in an
2503 empty field. Look at POSIX.2, 3.6.5, (3)(b). */
2504 if (string[sindex] && whitesep && issep (string[sindex]) && !spctabnl (string[sindex]))
2507 /* An IFS character that is not IFS white space, along with any
2508 adjacent IFS white space, shall delimit a field. (SUSv3) */
2509 while (string[sindex] && spctabnl (string[sindex]) && isifs (string[sindex]))
2513 return (REVERSE_LIST (result, WORD_LIST *));
2516 /* Parse a single word from STRING, using SEPARATORS to separate fields.
2517 ENDPTR is set to the first character after the word. This is used by
2518 the `read' builtin. This is never called with SEPARATORS != $IFS;
2519 it should be simplified.
2521 XXX - this function is very similar to list_string; they should be
2524 get_word_from_string (stringp, separators, endptr)
2525 char **stringp, *separators, **endptr;
2529 int sindex, sh_style_split, whitesep, xflags;
2532 if (!stringp || !*stringp || !**stringp)
2533 return ((char *)NULL);
2535 sh_style_split = separators && separators[0] == ' ' &&
2536 separators[1] == '\t' &&
2537 separators[2] == '\n' &&
2538 separators[3] == '\0';
2539 for (xflags = 0, s = ifs_value; s && *s; s++)
2541 if (*s == CTLESC) xflags |= SX_NOCTLESC;
2542 if (*s == CTLNUL) xflags |= SX_NOESCCTLNUL;
2548 /* Remove sequences of whitespace at the beginning of STRING, as
2549 long as those characters appear in IFS. */
2550 if (sh_style_split || !separators || !*separators)
2552 for (; *s && spctabnl (*s) && isifs (*s); s++);
2554 /* If the string is nothing but whitespace, update it and return. */
2560 return ((char *)NULL);
2564 /* OK, S points to a word that does not begin with white space.
2565 Now extract a word, stopping at a separator, save a pointer to
2566 the first character after the word, then skip sequences of spc,
2567 tab, or nl as long as they are separators.
2569 This obeys the field splitting rules in Posix.2. */
2571 /* Don't need string length in ADVANCE_CHAR or string_extract_verbatim
2572 unless multibyte chars are possible. */
2573 slen = (MB_CUR_MAX > 1) ? strlen (s) : 1;
2574 current_word = string_extract_verbatim (s, slen, &sindex, separators, xflags);
2576 /* Set ENDPTR to the first character after the end of the word. */
2578 *endptr = s + sindex;
2580 /* Note whether or not the separator is IFS whitespace, used later. */
2581 whitesep = s[sindex] && spctabnl (s[sindex]);
2583 /* Move past the current separator character. */
2587 ADVANCE_CHAR (s, slen, sindex);
2590 /* Now skip sequences of space, tab, or newline characters if they are
2591 in the list of separators. */
2592 while (s[sindex] && spctabnl (s[sindex]) && isifs (s[sindex]))
2595 /* If the first separator was IFS whitespace and the current character is
2596 a non-whitespace IFS character, it should be part of the current field
2597 delimiter, not a separate delimiter that would result in an empty field.
2598 Look at POSIX.2, 3.6.5, (3)(b). */
2599 if (s[sindex] && whitesep && isifs (s[sindex]) && !spctabnl (s[sindex]))
2602 /* An IFS character that is not IFS white space, along with any adjacent
2603 IFS white space, shall delimit a field. */
2604 while (s[sindex] && spctabnl (s[sindex]) && isifs (s[sindex]))
2608 /* Update STRING to point to the next field. */
2609 *stringp = s + sindex;
2610 return (current_word);
2613 /* Remove IFS white space at the end of STRING. Start at the end
2614 of the string and walk backwards until the beginning of the string
2615 or we find a character that's not IFS white space and not CTLESC.
2616 Only let CTLESC escape a white space character if SAW_ESCAPE is
2619 strip_trailing_ifs_whitespace (string, separators, saw_escape)
2620 char *string, *separators;
2625 s = string + STRLEN (string) - 1;
2626 while (s > string && ((spctabnl (*s) && isifs (*s)) ||
2627 (saw_escape && *s == CTLESC && spctabnl (s[1]))))
2635 /* Split STRING into words at whitespace. Obeys shell-style quoting with
2636 backslashes, single and double quotes. */
2638 list_string_with_quotes (string)
2644 int c, i, tokstart, len;
2646 for (s = string; s && *s && spctabnl (*s); s++)
2648 if (s == 0 || *s == 0)
2649 return ((WORD_LIST *)NULL);
2653 list = (WORD_LIST *)NULL;
2664 i = skip_single_quoted (s, s_len, ++i);
2666 i = skip_double_quoted (s, s_len, ++i);
2667 else if (c == 0 || spctabnl (c))
2669 /* We have found the end of a token. Make a word out of it and
2670 add it to the word list. */
2671 token = substring (s, tokstart, i);
2672 list = add_string_to_list (token, list);
2674 while (spctabnl (s[i]))
2682 i++; /* normal character */
2684 return (REVERSE_LIST (list, WORD_LIST *));
2688 /********************************************************/
2690 /* Functions to perform assignment statements */
2692 /********************************************************/
2694 #if defined (ARRAY_VARS)
2696 do_compound_assignment (name, value, flags)
2701 int mklocal, mkassoc;
2704 mklocal = flags & ASS_MKLOCAL;
2705 mkassoc = flags & ASS_MKASSOC;
2707 if (mklocal && variable_context)
2709 v = find_variable (name);
2710 list = expand_compound_array_assignment (v, value, flags);
2712 v = make_local_assoc_variable (name);
2713 else if (v == 0 || (array_p (v) == 0 && assoc_p (v) == 0) || v->context != variable_context)
2714 v = make_local_array_variable (name);
2715 assign_compound_array_list (v, list, flags);
2718 v = assign_array_from_string (name, value, flags);
2724 /* Given STRING, an assignment string, get the value of the right side
2725 of the `=', and bind it to the left side. If EXPAND is true, then
2726 perform parameter expansion, command substitution, and arithmetic
2727 expansion on the right-hand side. Perform tilde expansion in any
2728 case. Do not perform word splitting on the result of expansion. */
2730 do_assignment_internal (word, expand)
2731 const WORD_DESC *word;
2734 int offset, appendop, assign_list, aflags, retval;
2735 char *name, *value, *temp;
2737 #if defined (ARRAY_VARS)
2743 if (word == 0 || word->word == 0)
2746 appendop = assign_list = aflags = 0;
2747 string = word->word;
2748 offset = assignment (string, 0);
2749 name = savestring (string);
2750 value = (char *)NULL;
2752 if (name[offset] == '=')
2754 if (name[offset - 1] == '+')
2757 name[offset - 1] = '\0';
2760 name[offset] = 0; /* might need this set later */
2761 temp = name + offset + 1;
2763 #if defined (ARRAY_VARS)
2764 if (expand && (word->flags & W_COMPASSIGN))
2766 assign_list = ni = 1;
2767 value = extract_array_assignment_list (temp, &ni);
2771 if (expand && temp[0])
2772 value = expand_string_if_necessary (temp, 0, expand_string_assignment);
2774 value = savestring (temp);
2779 value = (char *)xmalloc (1);
2783 if (echo_command_at_execute)
2786 name[offset - 1] = '+';
2787 xtrace_print_assignment (name, value, assign_list, 1);
2789 name[offset - 1] = '\0';
2792 #define ASSIGN_RETURN(r) do { FREE (value); free (name); return (r); } while (0)
2795 aflags |= ASS_APPEND;
2797 #if defined (ARRAY_VARS)
2798 if (t = mbschr (name, '[')) /*]*/
2802 report_error (_("%s: cannot assign list to array member"), name);
2805 entry = assign_array_element (name, value, aflags);
2809 else if (assign_list)
2811 if ((word->flags & W_ASSIGNARG) && (word->flags & W_ASSNGLOBAL) == 0)
2812 aflags |= ASS_MKLOCAL;
2813 if (word->flags & W_ASSIGNASSOC)
2814 aflags |= ASS_MKASSOC;
2815 entry = do_compound_assignment (name, value, aflags);
2818 #endif /* ARRAY_VARS */
2819 entry = bind_variable (name, value, aflags);
2821 stupidly_hack_special_variables (name);
2824 /* Return 1 if the assignment seems to have been performed correctly. */
2825 if (entry == 0 || readonly_p (entry))
2826 retval = 0; /* assignment failure */
2827 else if (noassign_p (entry))
2829 last_command_exit_value = EXECUTION_FAILURE;
2830 retval = 1; /* error status, but not assignment failure */
2835 if (entry && retval != 0 && noassign_p (entry) == 0)
2836 VUNSETATTR (entry, att_invisible);
2838 ASSIGN_RETURN (retval);
2841 VUNSETATTR (entry, att_invisible);
2843 ASSIGN_RETURN (entry ? ((readonly_p (entry) == 0) && noassign_p (entry) == 0) : 0);
2847 /* Perform the assignment statement in STRING, and expand the
2848 right side by doing tilde, command and parameter expansion. */
2850 do_assignment (string)
2855 td.flags = W_ASSIGNMENT;
2858 return do_assignment_internal (&td, 1);
2862 do_word_assignment (word, flags)
2866 return do_assignment_internal (word, 1);
2869 /* Given STRING, an assignment string, get the value of the right side
2870 of the `=', and bind it to the left side. Do not perform any word
2871 expansions on the right hand side. */
2873 do_assignment_no_expand (string)
2878 td.flags = W_ASSIGNMENT;
2881 return (do_assignment_internal (&td, 0));
2884 /***************************************************
2886 * Functions to manage the positional parameters *
2888 ***************************************************/
2890 /* Return the word list that corresponds to `$*'. */
2892 list_rest_of_args ()
2894 register WORD_LIST *list, *args;
2897 /* Break out of the loop as soon as one of the dollar variables is null. */
2898 for (i = 1, list = (WORD_LIST *)NULL; i < 10 && dollar_vars[i]; i++)
2899 list = make_word_list (make_bare_word (dollar_vars[i]), list);
2901 for (args = rest_of_args; args; args = args->next)
2902 list = make_word_list (make_bare_word (args->word->word), list);
2904 return (REVERSE_LIST (list, WORD_LIST *));
2910 register WORD_LIST *list;
2913 for (n = 0; n < 9 && dollar_vars[n+1]; n++)
2915 for (list = rest_of_args; list; list = list->next)
2920 /* Return the value of a positional parameter. This handles values > 10. */
2922 get_dollar_var_value (ind)
2929 temp = dollar_vars[ind] ? savestring (dollar_vars[ind]) : (char *)NULL;
2930 else /* We want something like ${11} */
2933 for (p = rest_of_args; p && ind--; p = p->next)
2935 temp = p ? savestring (p->word->word) : (char *)NULL;
2940 /* Make a single large string out of the dollar digit variables,
2941 and the rest_of_args. If DOLLAR_STAR is 1, then obey the special
2942 case of "$*" with respect to IFS. */
2944 string_rest_of_args (dollar_star)
2947 register WORD_LIST *list;
2950 list = list_rest_of_args ();
2951 string = dollar_star ? string_list_dollar_star (list) : string_list (list);
2952 dispose_words (list);
2956 /* Return a string containing the positional parameters from START to
2957 END, inclusive. If STRING[0] == '*', we obey the rules for $*,
2958 which only makes a difference if QUOTED is non-zero. If QUOTED includes
2959 Q_HERE_DOCUMENT or Q_DOUBLE_QUOTES, this returns a quoted list, otherwise
2960 no quoting chars are added. */
2962 pos_params (string, start, end, quoted)
2964 int start, end, quoted;
2966 WORD_LIST *save, *params, *h, *t;
2970 /* see if we can short-circuit. if start == end, we want 0 parameters. */
2972 return ((char *)NULL);
2974 save = params = list_rest_of_args ();
2976 return ((char *)NULL);
2978 if (start == 0) /* handle ${@:0[:x]} specially */
2980 t = make_word_list (make_word (dollar_vars[0]), params);
2984 for (i = start ? 1 : 0; params && i < start; i++)
2985 params = params->next;
2987 return ((char *)NULL);
2988 for (h = t = params; params && i < end; i++)
2991 params = params->next;
2994 t->next = (WORD_LIST *)NULL;
2996 ret = string_list_pos_params (string[0], h, quoted);
3001 dispose_words (save);
3005 /******************************************************************/
3007 /* Functions to expand strings to strings or WORD_LISTs */
3009 /******************************************************************/
3011 #if defined (PROCESS_SUBSTITUTION)
3012 #define EXP_CHAR(s) (s == '$' || s == '`' || s == '<' || s == '>' || s == CTLESC || s == '~')
3014 #define EXP_CHAR(s) (s == '$' || s == '`' || s == CTLESC || s == '~')
3017 /* If there are any characters in STRING that require full expansion,
3018 then call FUNC to expand STRING; otherwise just perform quote
3019 removal if necessary. This returns a new string. */
3021 expand_string_if_necessary (string, quoted, func)
3032 /* Don't need string length for ADVANCE_CHAR unless multibyte chars possible. */
3033 slen = (MB_CUR_MAX > 1) ? strlen (string) : 0;
3037 if (EXP_CHAR (string[i]))
3039 else if (string[i] == '\'' || string[i] == '\\' || string[i] == '"')
3041 ADVANCE_CHAR (string, slen, i);
3046 list = (*func) (string, quoted);
3049 ret = string_list (list);
3050 dispose_words (list);
3055 else if (saw_quote && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0))
3056 ret = string_quote_removal (string, quoted);
3058 ret = savestring (string);
3063 static inline char *
3064 expand_string_to_string_internal (string, quoted, func)
3072 if (string == 0 || *string == '\0')
3073 return ((char *)NULL);
3075 list = (*func) (string, quoted);
3078 ret = string_list (list);
3079 dispose_words (list);
3088 expand_string_to_string (string, quoted)
3092 return (expand_string_to_string_internal (string, quoted, expand_string));
3096 expand_string_unsplit_to_string (string, quoted)
3100 return (expand_string_to_string_internal (string, quoted, expand_string_unsplit));
3104 expand_assignment_string_to_string (string, quoted)
3108 return (expand_string_to_string_internal (string, quoted, expand_string_assignment));
3112 expand_arith_string (string, quoted)
3116 return (expand_string_if_necessary (string, quoted, expand_string));
3119 #if defined (COND_COMMAND)
3120 /* Just remove backslashes in STRING. Returns a new string. */
3122 remove_backslashes (string)
3127 r = ret = (char *)xmalloc (strlen (string) + 1);
3128 for (s = string; s && *s; )
3140 /* This needs better error handling. */
3141 /* Expand W for use as an argument to a unary or binary operator in a
3142 [[...]] expression. If SPECIAL is 1, this is the rhs argument
3143 to the != or == operator, and should be treated as a pattern. In
3144 this case, we quote the string specially for the globbing code. If
3145 SPECIAL is 2, this is an rhs argument for the =~ operator, and should
3146 be quoted appropriately for regcomp/regexec. The caller is responsible
3147 for removing the backslashes if the unquoted word is needed later. */
3149 cond_expand_word (w, special)
3157 if (w->word == 0 || w->word[0] == '\0')
3158 return ((char *)NULL);
3160 w->flags |= W_NOSPLIT2;
3161 l = call_expand_word_internal (w, 0, 0, (int *)0, (int *)0);
3167 r = string_list (l);
3171 qflags = QGLOB_CVTNULL;
3173 qflags |= QGLOB_REGEXP;
3174 p = string_list (l);
3175 r = quote_string_for_globbing (p, qflags);
3187 /* Call expand_word_internal to expand W and handle error returns.
3188 A convenience function for functions that don't want to handle
3189 any errors or free any memory before aborting. */
3191 call_expand_word_internal (w, q, i, c, e)
3197 result = expand_word_internal (w, q, i, c, e);
3198 if (result == &expand_word_error || result == &expand_word_fatal)
3200 /* By convention, each time this error is returned, w->word has
3201 already been freed (it sometimes may not be in the fatal case,
3202 but that doesn't result in a memory leak because we're going
3203 to exit in most cases). */
3204 w->word = (char *)NULL;
3205 last_command_exit_value = EXECUTION_FAILURE;
3206 exp_jump_to_top_level ((result == &expand_word_error) ? DISCARD : FORCE_EOF);
3213 /* Perform parameter expansion, command substitution, and arithmetic
3214 expansion on STRING, as if it were a word. Leave the result quoted. */
3216 expand_string_internal (string, quoted)
3223 if (string == 0 || *string == 0)
3224 return ((WORD_LIST *)NULL);
3227 td.word = savestring (string);
3229 tresult = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL);
3235 /* Expand STRING by performing parameter expansion, command substitution,
3236 and arithmetic expansion. Dequote the resulting WORD_LIST before
3237 returning it, but do not perform word splitting. The call to
3238 remove_quoted_nulls () is in here because word splitting normally
3239 takes care of quote removal. */
3241 expand_string_unsplit (string, quoted)
3247 if (string == 0 || *string == '\0')
3248 return ((WORD_LIST *)NULL);
3250 expand_no_split_dollar_star = 1;
3251 value = expand_string_internal (string, quoted);
3252 expand_no_split_dollar_star = 0;
3258 remove_quoted_nulls (value->word->word);
3259 value->word->flags &= ~W_HASQUOTEDNULL;
3261 dequote_list (value);
3266 /* Expand the rhs of an assignment statement */
3268 expand_string_assignment (string, quoted)
3275 if (string == 0 || *string == '\0')
3276 return ((WORD_LIST *)NULL);
3278 expand_no_split_dollar_star = 1;
3280 td.flags = W_ASSIGNRHS;
3281 td.word = savestring (string);
3282 value = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL);
3285 expand_no_split_dollar_star = 0;
3291 remove_quoted_nulls (value->word->word);
3292 value->word->flags &= ~W_HASQUOTEDNULL;
3294 dequote_list (value);
3300 /* Expand one of the PS? prompt strings. This is a sort of combination of
3301 expand_string_unsplit and expand_string_internal, but returns the
3302 passed string when an error occurs. Might want to trap other calls
3303 to jump_to_top_level here so we don't endlessly loop. */
3305 expand_prompt_string (string, quoted, wflags)
3313 if (string == 0 || *string == 0)
3314 return ((WORD_LIST *)NULL);
3317 td.word = savestring (string);
3319 no_longjmp_on_fatal_error = 1;
3320 value = expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL);
3321 no_longjmp_on_fatal_error = 0;
3323 if (value == &expand_word_error || value == &expand_word_fatal)
3325 value = make_word_list (make_bare_word (string), (WORD_LIST *)NULL);
3333 remove_quoted_nulls (value->word->word);
3334 value->word->flags &= ~W_HASQUOTEDNULL;
3336 dequote_list (value);
3341 /* Expand STRING just as if you were expanding a word, but do not dequote
3342 the resultant WORD_LIST. This is called only from within this file,
3343 and is used to correctly preserve quoted characters when expanding
3344 things like ${1+"$@"}. This does parameter expansion, command
3345 substitution, arithmetic expansion, and word splitting. */
3347 expand_string_leave_quoted (string, quoted)
3354 if (string == 0 || *string == '\0')
3355 return ((WORD_LIST *)NULL);
3357 tlist = expand_string_internal (string, quoted);
3361 tresult = word_list_split (tlist);
3362 dispose_words (tlist);
3365 return ((WORD_LIST *)NULL);
3368 /* This does not perform word splitting or dequote the WORD_LIST
3371 expand_string_for_rhs (string, quoted, dollar_at_p, has_dollar_at)
3373 int quoted, *dollar_at_p, *has_dollar_at;
3378 if (string == 0 || *string == '\0')
3379 return (WORD_LIST *)NULL;
3381 td.flags = W_NOSPLIT2; /* no splitting, remove "" and '' */
3383 tresult = call_expand_word_internal (&td, quoted, 1, dollar_at_p, has_dollar_at);
3387 /* Expand STRING just as if you were expanding a word. This also returns
3388 a list of words. Note that filename globbing is *NOT* done for word
3389 or string expansion, just when the shell is expanding a command. This
3390 does parameter expansion, command substitution, arithmetic expansion,
3391 and word splitting. Dequote the resultant WORD_LIST before returning. */
3393 expand_string (string, quoted)
3399 if (string == 0 || *string == '\0')
3400 return ((WORD_LIST *)NULL);
3402 result = expand_string_leave_quoted (string, quoted);
3403 return (result ? dequote_list (result) : result);
3406 /***************************************************
3408 * Functions to handle quoting chars *
3410 ***************************************************/
3414 A string with s[0] == CTLNUL && s[1] == 0 is a quoted null string.
3415 The parser passes CTLNUL as CTLESC CTLNUL. */
3417 /* Quote escape characters in string s, but no other characters. This is
3418 used to protect CTLESC and CTLNUL in variable values from the rest of
3419 the word expansion process after the variable is expanded (word splitting
3420 and filename generation). If IFS is null, we quote spaces as well, just
3421 in case we split on spaces later (in the case of unquoted $@, we will
3422 eventually attempt to split the entire word on spaces). Corresponding
3423 code exists in dequote_escapes. Even if we don't end up splitting on
3424 spaces, quoting spaces is not a problem. This should never be called on
3425 a string that is quoted with single or double quotes or part of a here
3426 document (effectively double-quoted). */
3428 quote_escapes (string)
3431 register char *s, *t;
3433 char *result, *send;
3434 int quote_spaces, skip_ctlesc, skip_ctlnul;
3437 slen = strlen (string);
3438 send = string + slen;
3440 quote_spaces = (ifs_value && *ifs_value == 0);
3442 for (skip_ctlesc = skip_ctlnul = 0, s = ifs_value; s && *s; s++)
3443 skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL;
3445 t = result = (char *)xmalloc ((slen * 2) + 1);
3450 if ((skip_ctlesc == 0 && *s == CTLESC) || (skip_ctlnul == 0 && *s == CTLNUL) || (quote_spaces && *s == ' '))
3452 COPY_CHAR_P (t, s, send);
3459 list_quote_escapes (list)
3462 register WORD_LIST *w;
3465 for (w = list; w; w = w->next)
3468 w->word->word = quote_escapes (t);
3474 /* Inverse of quote_escapes; remove CTLESC protecting CTLESC or CTLNUL.
3476 The parser passes us CTLESC as CTLESC CTLESC and CTLNUL as CTLESC CTLNUL.
3477 This is necessary to make unquoted CTLESC and CTLNUL characters in the
3478 data stream pass through properly.
3480 We need to remove doubled CTLESC characters inside quoted strings before
3481 quoting the entire string, so we do not double the number of CTLESC
3484 Also used by parts of the pattern substitution code. */
3486 dequote_escapes (string)
3489 register char *s, *t, *s1;
3491 char *result, *send;
3498 slen = strlen (string);
3499 send = string + slen;
3501 t = result = (char *)xmalloc (slen + 1);
3503 if (strchr (string, CTLESC) == 0)
3504 return (strcpy (result, string));
3506 quote_spaces = (ifs_value && *ifs_value == 0);
3511 if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL || (quote_spaces && s[1] == ' ')))
3517 COPY_CHAR_P (t, s, send);
3523 /* Return a new string with the quoted representation of character C.
3524 This turns "" into QUOTED_NULL, so the W_HASQUOTEDNULL flag needs to be
3525 set in any resultant WORD_DESC where this value is the word. */
3527 make_quoted_char (c)
3532 temp = (char *)xmalloc (3);
3547 /* Quote STRING, returning a new string. This turns "" into QUOTED_NULL, so
3548 the W_HASQUOTEDNULL flag needs to be set in any resultant WORD_DESC where
3549 this value is the word. */
3551 quote_string (string)
3556 char *result, *send;
3560 result = (char *)xmalloc (2);
3568 slen = strlen (string);
3569 send = string + slen;
3571 result = (char *)xmalloc ((slen * 2) + 1);
3573 for (t = result; string < send; )
3576 COPY_CHAR_P (t, string, send);
3583 /* De-quote quoted characters in STRING. */
3585 dequote_string (string)
3588 register char *s, *t;
3590 char *result, *send;
3593 slen = strlen (string);
3595 t = result = (char *)xmalloc (slen + 1);
3597 if (QUOTED_NULL (string))
3603 /* If no character in the string can be quoted, don't bother examining
3604 each character. Just return a copy of the string passed to us. */
3605 if (strchr (string, CTLESC) == NULL)
3606 return (strcpy (result, string));
3608 send = string + slen;
3618 COPY_CHAR_P (t, s, send);
3625 /* Quote the entire WORD_LIST list. */
3630 register WORD_LIST *w;
3633 for (w = list; w; w = w->next)
3636 w->word->word = quote_string (t);
3638 w->word->flags |= W_HASQUOTEDNULL; /* XXX - turn on W_HASQUOTEDNULL here? */
3639 w->word->flags |= W_QUOTED;
3645 /* De-quote quoted characters in each word in LIST. */
3651 register WORD_LIST *tlist;
3653 for (tlist = list; tlist; tlist = tlist->next)
3655 s = dequote_string (tlist->word->word);
3656 if (QUOTED_NULL (tlist->word->word))
3657 tlist->word->flags &= ~W_HASQUOTEDNULL;
3658 free (tlist->word->word);
3659 tlist->word->word = s;
3664 /* Remove CTLESC protecting a CTLESC or CTLNUL in place. Return the passed
3667 remove_quoted_escapes (string)
3674 t = dequote_escapes (string);
3682 /* Perform quoted null character removal on STRING. We don't allow any
3683 quoted null characters in the middle or at the ends of strings because
3684 of how expand_word_internal works. remove_quoted_nulls () turns
3685 STRING into an empty string iff it only consists of a quoted null,
3686 and removes all unquoted CTLNUL characters. */
3688 remove_quoted_nulls (string)
3691 register size_t slen;
3692 register int i, j, prev_i;
3695 if (strchr (string, CTLNUL) == 0) /* XXX */
3696 return string; /* XXX */
3698 slen = strlen (string);
3703 if (string[i] == CTLESC)
3705 /* Old code had j++, but we cannot assume that i == j at this
3706 point -- what if a CTLNUL has already been removed from the
3707 string? We don't want to drop the CTLESC or recopy characters
3708 that we've already copied down. */
3709 i++; string[j++] = CTLESC;
3713 else if (string[i] == CTLNUL)
3720 ADVANCE_CHAR (string, slen, i);
3723 do string[j++] = string[prev_i++]; while (prev_i < i);
3733 /* Perform quoted null character removal on each element of LIST.
3734 This modifies LIST. */
3736 word_list_remove_quoted_nulls (list)
3739 register WORD_LIST *t;
3741 for (t = list; t; t = t->next)
3743 remove_quoted_nulls (t->word->word);
3744 t->word->flags &= ~W_HASQUOTEDNULL;
3748 /* **************************************************************** */
3750 /* Functions for Matching and Removing Patterns */
3752 /* **************************************************************** */
3754 #if defined (HANDLE_MULTIBYTE)
3755 #if 0 /* Currently unused */
3756 static unsigned char *
3757 mb_getcharlens (string, len)
3761 int i, offset, last;
3768 ret = (unsigned char *)xmalloc (len);
3769 memset (ret, 0, len);
3770 while (string[last])
3772 ADVANCE_CHAR (string, len, offset);
3773 ret[last] = offset - last;
3781 /* Remove the portion of PARAM matched by PATTERN according to OP, where OP
3782 can have one of 4 values:
3783 RP_LONG_LEFT remove longest matching portion at start of PARAM
3784 RP_SHORT_LEFT remove shortest matching portion at start of PARAM
3785 RP_LONG_RIGHT remove longest matching portion at end of PARAM
3786 RP_SHORT_RIGHT remove shortest matching portion at end of PARAM
3789 #define RP_LONG_LEFT 1
3790 #define RP_SHORT_LEFT 2
3791 #define RP_LONG_RIGHT 3
3792 #define RP_SHORT_RIGHT 4
3794 /* Returns its first argument if nothing matched; new memory otherwise */
3796 remove_upattern (param, pattern, op)
3797 char *param, *pattern;
3802 register char *p, *ret, c;
3804 len = STRLEN (param);
3809 case RP_LONG_LEFT: /* remove longest match at start */
3810 for (p = end; p >= param; p--)
3813 if (strmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3816 return (savestring (p));
3823 case RP_SHORT_LEFT: /* remove shortest match at start */
3824 for (p = param; p <= end; p++)
3827 if (strmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3830 return (savestring (p));
3836 case RP_LONG_RIGHT: /* remove longest match at end */
3837 for (p = param; p <= end; p++)
3839 if (strmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3842 ret = savestring (param);
3849 case RP_SHORT_RIGHT: /* remove shortest match at end */
3850 for (p = end; p >= param; p--)
3852 if (strmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3855 ret = savestring (param);
3863 return (param); /* no match, return original string */
3866 #if defined (HANDLE_MULTIBYTE)
3867 /* Returns its first argument if nothing matched; new memory otherwise */
3869 remove_wpattern (wparam, wstrlen, wpattern, op)
3880 case RP_LONG_LEFT: /* remove longest match at start */
3881 for (n = wstrlen; n >= 0; n--)
3883 wc = wparam[n]; wparam[n] = L'\0';
3884 if (wcsmatch (wpattern, wparam, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3887 return (wcsdup (wparam + n));
3893 case RP_SHORT_LEFT: /* remove shortest match at start */
3894 for (n = 0; n <= wstrlen; n++)
3896 wc = wparam[n]; wparam[n] = L'\0';
3897 if (wcsmatch (wpattern, wparam, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3900 return (wcsdup (wparam + n));
3906 case RP_LONG_RIGHT: /* remove longest match at end */
3907 for (n = 0; n <= wstrlen; n++)
3909 if (wcsmatch (wpattern, wparam + n, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3911 wc = wparam[n]; wparam[n] = L'\0';
3912 ret = wcsdup (wparam);
3919 case RP_SHORT_RIGHT: /* remove shortest match at end */
3920 for (n = wstrlen; n >= 0; n--)
3922 if (wcsmatch (wpattern, wparam + n, FNMATCH_EXTFLAG) != FNM_NOMATCH)
3924 wc = wparam[n]; wparam[n] = L'\0';
3925 ret = wcsdup (wparam);
3933 return (wparam); /* no match, return original string */
3935 #endif /* HANDLE_MULTIBYTE */
3938 remove_pattern (param, pattern, op)
3939 char *param, *pattern;
3946 if (*param == '\0' || pattern == NULL || *pattern == '\0') /* minor optimization */
3947 return (savestring (param));
3949 #if defined (HANDLE_MULTIBYTE)
3952 wchar_t *ret, *oret;
3954 wchar_t *wparam, *wpattern;
3957 n = xdupmbstowcs (&wpattern, NULL, pattern);
3958 if (n == (size_t)-1)
3960 xret = remove_upattern (param, pattern, op);
3961 return ((xret == param) ? savestring (param) : xret);
3963 n = xdupmbstowcs (&wparam, NULL, param);
3964 if (n == (size_t)-1)
3967 xret = remove_upattern (param, pattern, op);
3968 return ((xret == param) ? savestring (param) : xret);
3970 oret = ret = remove_wpattern (wparam, n, wpattern, op);
3971 /* Don't bother to convert wparam back to multibyte string if nothing
3972 matched; just return copy of original string */
3977 return (savestring (param));
3984 xret = (char *)xmalloc (n + 1);
3985 memset (&ps, '\0', sizeof (mbstate_t));
3986 n = wcsrtombs (xret, (const wchar_t **)&ret, n, &ps);
3987 xret[n] = '\0'; /* just to make sure */
3994 xret = remove_upattern (param, pattern, op);
3995 return ((xret == param) ? savestring (param) : xret);
3999 /* Match PAT anywhere in STRING and return the match boundaries.
4000 This returns 1 in case of a successful match, 0 otherwise. SP
4001 and EP are pointers into the string where the match begins and
4002 ends, respectively. MTYPE controls what kind of match is attempted.
4003 MATCH_BEG and MATCH_END anchor the match at the beginning and end
4004 of the string, respectively. The longest match is returned. */
4006 match_upattern (string, pat, mtype, sp, ep)
4012 register char *p, *p1, *npat;
4016 /* If the pattern doesn't match anywhere in the string, go ahead and
4017 short-circuit right away. A minor optimization, saves a bunch of
4018 unnecessary calls to strmatch (up to N calls for a string of N
4019 characters) if the match is unsuccessful. To preserve the semantics
4020 of the substring matches below, we make sure that the pattern has
4021 `*' as first and last character, making a new pattern if necessary. */
4022 /* XXX - check this later if I ever implement `**' with special meaning,
4023 since this will potentially result in `**' at the beginning or end */
4025 if (pat[0] != '*' || (pat[0] == '*' && pat[1] == LPAREN && extended_glob) || pat[len - 1] != '*')
4027 p = npat = (char *)xmalloc (len + 3);
4029 if (*p1 != '*' || (*p1 == '*' && p1[1] == LPAREN && extended_glob))
4033 if (p1[-1] != '*' || p[-2] == '\\')
4039 c = strmatch (npat, string, FNMATCH_EXTFLAG);
4042 if (c == FNM_NOMATCH)
4045 len = STRLEN (string);
4048 mlen = umatchlen (pat, len);
4053 for (p = string; p <= end; p++)
4055 if (match_pattern_char (pat, p))
4058 for (p1 = end; p1 >= p; p1--)
4060 p1 = (mlen == -1) ? end : p + mlen;
4061 /* p1 - p = length of portion of string to be considered
4062 p = current position in string
4063 mlen = number of characters consumed by match (-1 for entire string)
4065 we want to break immediately if the potential match len
4066 is greater than the number of characters remaining in the
4071 for ( ; p1 >= p; p1--)
4074 c = *p1; *p1 = '\0';
4075 if (strmatch (pat, p, FNMATCH_EXTFLAG) == 0)
4084 /* If MLEN != -1, we have a fixed length pattern. */
4095 if (match_pattern_char (pat, string) == 0)
4099 for (p = end; p >= string; p--)
4101 for (p = (mlen == -1) ? end : string + mlen; p >= string; p--)
4105 if (strmatch (pat, string, FNMATCH_EXTFLAG) == 0)
4114 /* If MLEN != -1, we have a fixed length pattern. */
4124 for (p = string; p <= end; p++)
4126 for (p = end - ((mlen == -1) ? len : mlen); p <= end; p++)
4129 if (strmatch (pat, p, FNMATCH_EXTFLAG) == 0)
4136 /* If MLEN != -1, we have a fixed length pattern. */
4148 #if defined (HANDLE_MULTIBYTE)
4149 /* Match WPAT anywhere in WSTRING and return the match boundaries.
4150 This returns 1 in case of a successful match, 0 otherwise. Wide
4151 character version. */
4153 match_wpattern (wstring, indices, wstrlen, wpat, mtype, sp, ep)
4161 wchar_t wc, *wp, *nwpat, *wp1;
4164 int n, n1, n2, simple;
4166 simple = (wpat[0] != L'\\' && wpat[0] != L'*' && wpat[0] != L'?' && wpat[0] != L'[');
4167 #if defined (EXTENDED_GLOB)
4169 simple &= (wpat[1] != L'(' || (wpat[0] != L'*' && wpat[0] != L'?' && wpat[0] != L'+' && wpat[0] != L'!' && wpat[0] != L'@')); /*)*/
4172 /* If the pattern doesn't match anywhere in the string, go ahead and
4173 short-circuit right away. A minor optimization, saves a bunch of
4174 unnecessary calls to strmatch (up to N calls for a string of N
4175 characters) if the match is unsuccessful. To preserve the semantics
4176 of the substring matches below, we make sure that the pattern has
4177 `*' as first and last character, making a new pattern if necessary. */
4178 len = wcslen (wpat);
4179 if (wpat[0] != L'*' || (wpat[0] == L'*' && wpat[1] == WLPAREN && extended_glob) || wpat[len - 1] != L'*')
4181 wp = nwpat = (wchar_t *)xmalloc ((len + 3) * sizeof (wchar_t));
4183 if (*wp1 != L'*' || (*wp1 == '*' && wp1[1] == WLPAREN && extended_glob))
4185 while (*wp1 != L'\0')
4187 if (wp1[-1] != L'*' || wp1[-2] == L'\\')
4193 len = wcsmatch (nwpat, wstring, FNMATCH_EXTFLAG);
4196 if (len == FNM_NOMATCH)
4199 mlen = wmatchlen (wpat, wstrlen);
4201 /* itrace("wmatchlen (%ls) -> %d", wpat, mlen); */
4205 for (n = 0; n <= wstrlen; n++)
4208 n2 = simple ? (*wpat == wstring[n]) : match_pattern_wchar (wpat, wstring + n);
4210 n2 = match_pattern_wchar (wpat, wstring + n);
4215 for (n1 = wstrlen; n1 >= n; n1--)
4217 n1 = (mlen == -1) ? wstrlen : n + mlen;
4221 for ( ; n1 >= n; n1--)
4224 wc = wstring[n1]; wstring[n1] = L'\0';
4225 if (wcsmatch (wpat, wstring + n, FNMATCH_EXTFLAG) == 0)
4234 /* If MLEN != -1, we have a fixed length pattern. */
4245 if (match_pattern_wchar (wpat, wstring) == 0)
4249 for (n = wstrlen; n >= 0; n--)
4251 for (n = (mlen == -1) ? wstrlen : mlen; n >= 0; n--)
4254 wc = wstring[n]; wstring[n] = L'\0';
4255 if (wcsmatch (wpat, wstring, FNMATCH_EXTFLAG) == 0)
4264 /* If MLEN != -1, we have a fixed length pattern. */
4274 for (n = 0; n <= wstrlen; n++)
4276 for (n = wstrlen - ((mlen == -1) ? wstrlen : mlen); n <= wstrlen; n++)
4279 if (wcsmatch (wpat, wstring + n, FNMATCH_EXTFLAG) == 0)
4282 *ep = indices[wstrlen];
4286 /* If MLEN != -1, we have a fixed length pattern. */
4297 #endif /* HANDLE_MULTIBYTE */
4300 match_pattern (string, pat, mtype, sp, ep)
4305 #if defined (HANDLE_MULTIBYTE)
4308 wchar_t *wstring, *wpat;
4310 size_t slen, plen, mslen, mplen;
4313 if (string == 0 || *string == 0 || pat == 0 || *pat == 0)
4316 #if defined (HANDLE_MULTIBYTE)
4320 slen = STRLEN (string);
4321 mslen = MBSLEN (string);
4322 plen = STRLEN (pat);
4323 mplen = MBSLEN (pat);
4324 if (slen == mslen && plen == mplen)
4326 if (mbsmbchar (string) == 0 && mbsmbchar (pat) == 0)
4328 return (match_upattern (string, pat, mtype, sp, ep));
4330 n = xdupmbstowcs (&wpat, NULL, pat);
4331 if (n == (size_t)-1)
4332 return (match_upattern (string, pat, mtype, sp, ep));
4333 n = xdupmbstowcs (&wstring, &indices, string);
4334 if (n == (size_t)-1)
4337 return (match_upattern (string, pat, mtype, sp, ep));
4339 ret = match_wpattern (wstring, indices, n, wpat, mtype, sp, ep);
4349 return (match_upattern (string, pat, mtype, sp, ep));
4353 getpatspec (c, value)
4358 return ((*value == '#') ? RP_LONG_LEFT : RP_SHORT_LEFT);
4360 return ((*value == '%') ? RP_LONG_RIGHT : RP_SHORT_RIGHT);
4363 /* Posix.2 says that the WORD should be run through tilde expansion,
4364 parameter expansion, command substitution and arithmetic expansion.
4365 This leaves the result quoted, so quote_string_for_globbing () has
4366 to be called to fix it up for strmatch (). If QUOTED is non-zero,
4367 it means that the entire expression was enclosed in double quotes.
4368 This means that quoting characters in the pattern do not make any
4369 special pattern characters quoted. For example, the `*' in the
4370 following retains its special meaning: "${foo#'*'}". */
4372 getpattern (value, quoted, expandpat)
4374 int quoted, expandpat;
4381 /* There is a problem here: how to handle single or double quotes in the
4382 pattern string when the whole expression is between double quotes?
4383 POSIX.2 says that enclosing double quotes do not cause the pattern to
4384 be quoted, but does that leave us a problem with @ and array[@] and their
4385 expansions inside a pattern? */
4387 if (expandpat && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *tword)
4390 pat = string_extract_double_quoted (tword, &i, 1);
4396 /* expand_string_for_rhs () leaves WORD quoted and does not perform
4398 l = *value ? expand_string_for_rhs (value,
4399 (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? Q_PATQUOTE : quoted,
4400 (int *)NULL, (int *)NULL)
4402 pat = string_list (l);
4406 tword = quote_string_for_globbing (pat, QGLOB_CVTNULL);
4414 /* Handle removing a pattern from a string as a result of ${name%[%]value}
4415 or ${name#[#]value}. */
4417 variable_remove_pattern (value, pattern, patspec, quoted)
4418 char *value, *pattern;
4419 int patspec, quoted;
4423 tword = remove_pattern (value, pattern, patspec);
4430 list_remove_pattern (list, pattern, patspec, itype, quoted)
4433 int patspec, itype, quoted;
4439 for (new = (WORD_LIST *)NULL, l = list; l; l = l->next)
4441 tword = remove_pattern (l->word->word, pattern, patspec);
4442 w = alloc_word_desc ();
4443 w->word = tword ? tword : savestring ("");
4444 new = make_word_list (w, new);
4447 l = REVERSE_LIST (new, WORD_LIST *);
4448 tword = string_list_pos_params (itype, l, quoted);
4455 parameter_list_remove_pattern (itype, pattern, patspec, quoted)
4458 int patspec, quoted;
4463 list = list_rest_of_args ();
4465 return ((char *)NULL);
4466 ret = list_remove_pattern (list, pattern, patspec, itype, quoted);
4467 dispose_words (list);
4471 #if defined (ARRAY_VARS)
4473 array_remove_pattern (var, pattern, patspec, varname, quoted)
4477 char *varname; /* so we can figure out how it's indexed */
4487 /* compute itype from varname here */
4488 v = array_variable_part (varname, &ret, 0);
4491 a = (v && array_p (v)) ? array_cell (v) : 0;
4492 h = (v && assoc_p (v)) ? assoc_cell (v) : 0;
4494 list = a ? array_to_word_list (a) : (h ? assoc_to_word_list (h) : 0);
4496 return ((char *)NULL);
4497 ret = list_remove_pattern (list, pattern, patspec, itype, quoted);
4498 dispose_words (list);
4502 #endif /* ARRAY_VARS */
4505 parameter_brace_remove_pattern (varname, value, ind, patstr, rtype, quoted, flags)
4506 char *varname, *value;
4509 int rtype, quoted, flags;
4511 int vtype, patspec, starsub;
4512 char *temp1, *val, *pattern;
4516 return ((char *)NULL);
4518 this_command_name = varname;
4520 vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val);
4522 return ((char *)NULL);
4524 starsub = vtype & VT_STARSUB;
4525 vtype &= ~VT_STARSUB;
4527 patspec = getpatspec (rtype, patstr);
4528 if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT)
4531 /* Need to pass getpattern newly-allocated memory in case of expansion --
4532 the expansion code will free the passed string on an error. */
4533 temp1 = savestring (patstr);
4534 pattern = getpattern (temp1, quoted, 1);
4537 temp1 = (char *)NULL; /* shut up gcc */
4541 case VT_ARRAYMEMBER:
4542 temp1 = remove_pattern (val, pattern, patspec);
4543 if (vtype == VT_VARIABLE)
4547 val = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
4548 ? quote_string (temp1)
4549 : quote_escapes (temp1);
4554 #if defined (ARRAY_VARS)
4556 temp1 = array_remove_pattern (v, pattern, patspec, varname, quoted);
4557 if (temp1 && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0))
4559 val = quote_escapes (temp1);
4566 temp1 = parameter_list_remove_pattern (varname[0], pattern, patspec, quoted);
4567 if (temp1 && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0))
4569 val = quote_escapes (temp1);
4580 /*******************************************
4582 * Functions to expand WORD_DESCs *
4584 *******************************************/
4586 /* Expand WORD, performing word splitting on the result. This does
4587 parameter expansion, command substitution, arithmetic expansion,
4588 word splitting, and quote removal. */
4591 expand_word (word, quoted)
4595 WORD_LIST *result, *tresult;
4597 tresult = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL);
4598 result = word_list_split (tresult);
4599 dispose_words (tresult);
4600 return (result ? dequote_list (result) : result);
4603 /* Expand WORD, but do not perform word splitting on the result. This
4604 does parameter expansion, command substitution, arithmetic expansion,
4605 and quote removal. */
4607 expand_word_unsplit (word, quoted)
4613 expand_no_split_dollar_star = 1;
4614 #if defined (HANDLE_MULTIBYTE)
4615 if (ifs_firstc[0] == 0)
4617 if (ifs_firstc == 0)
4619 word->flags |= W_NOSPLIT;
4620 word->flags |= W_NOSPLIT2;
4621 result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL);
4622 expand_no_split_dollar_star = 0;
4624 return (result ? dequote_list (result) : result);
4627 /* Perform shell expansions on WORD, but do not perform word splitting or
4628 quote removal on the result. Virtually identical to expand_word_unsplit;
4629 could be combined if implementations don't diverge. */
4631 expand_word_leave_quoted (word, quoted)
4637 expand_no_split_dollar_star = 1;
4638 #if defined (HANDLE_MULTIBYTE)
4639 if (ifs_firstc[0] == 0)
4641 if (ifs_firstc == 0)
4643 word->flags |= W_NOSPLIT;
4644 word->flags |= W_NOSPLIT2;
4645 result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL);
4646 expand_no_split_dollar_star = 0;
4651 #if defined (PROCESS_SUBSTITUTION)
4653 /*****************************************************************/
4655 /* Hacking Process Substitution */
4657 /*****************************************************************/
4659 #if !defined (HAVE_DEV_FD)
4660 /* Named pipes must be removed explicitly with `unlink'. This keeps a list
4661 of FIFOs the shell has open. unlink_fifo_list will walk the list and
4662 unlink all of them. add_fifo_list adds the name of an open FIFO to the
4663 list. NFIFO is a count of the number of FIFOs in the list. */
4664 #define FIFO_INCR 20
4671 static struct temp_fifo *fifo_list = (struct temp_fifo *)NULL;
4673 static int fifo_list_size;
4676 copy_fifo_list (sizep)
4681 return (char *)NULL;
4685 add_fifo_list (pathname)
4688 if (nfifo >= fifo_list_size - 1)
4690 fifo_list_size += FIFO_INCR;
4691 fifo_list = (struct temp_fifo *)xrealloc (fifo_list,
4692 fifo_list_size * sizeof (struct temp_fifo));
4695 fifo_list[nfifo].file = savestring (pathname);
4703 if ((fifo_list[i].proc == -1) || (kill(fifo_list[i].proc, 0) == -1))
4705 unlink (fifo_list[i].file);
4706 free (fifo_list[i].file);
4707 fifo_list[i].file = (char *)NULL;
4708 fifo_list[i].proc = -1;
4720 for (i = saved = 0; i < nfifo; i++)
4722 if ((fifo_list[i].proc == -1) || (kill(fifo_list[i].proc, 0) == -1))
4724 unlink (fifo_list[i].file);
4725 free (fifo_list[i].file);
4726 fifo_list[i].file = (char *)NULL;
4727 fifo_list[i].proc = -1;
4733 /* If we didn't remove some of the FIFOs, compact the list. */
4736 for (i = j = 0; i < nfifo; i++)
4737 if (fifo_list[i].file)
4739 fifo_list[j].file = fifo_list[i].file;
4740 fifo_list[j].proc = fifo_list[i].proc;
4749 /* Take LIST, which is a bitmap denoting active FIFOs in fifo_list
4750 from some point in the past, and close all open FIFOs in fifo_list
4751 that are not marked as active in LIST. If LIST is NULL, close
4752 everything in fifo_list. LSIZE is the number of elements in LIST, in
4753 case it's larger than fifo_list_size (size of fifo_list). */
4755 close_new_fifos (list, lsize)
4763 unlink_fifo_list ();
4767 for (i = 0; i < lsize; i++)
4768 if (list[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1)
4771 for (i = lsize; i < fifo_list_size; i++)
4792 tname = sh_mktmpname ("sh-np", MT_USERANDOM|MT_USETMPDIR);
4793 if (mkfifo (tname, 0600) < 0)
4796 return ((char *)NULL);
4799 add_fifo_list (tname);
4803 #else /* HAVE_DEV_FD */
4805 /* DEV_FD_LIST is a bitmap of file descriptors attached to pipes the shell
4806 has open to children. NFDS is a count of the number of bits currently
4807 set in DEV_FD_LIST. TOTFDS is a count of the highest possible number
4809 static char *dev_fd_list = (char *)NULL;
4811 static int totfds; /* The highest possible number of open files. */
4814 copy_fifo_list (sizep)
4819 if (nfds == 0 || totfds == 0)
4823 return (char *)NULL;
4828 ret = (char *)xmalloc (totfds);
4829 return (memcpy (ret, dev_fd_list, totfds));
4836 if (dev_fd_list == 0 || fd >= totfds)
4841 totfds = getdtablesize ();
4842 if (totfds < 0 || totfds > 256)
4847 dev_fd_list = (char *)xrealloc (dev_fd_list, totfds);
4848 memset (dev_fd_list + ofds, '\0', totfds - ofds);
4851 dev_fd_list[fd] = 1;
4858 return 0; /* used for cleanup; not needed with /dev/fd */
4871 if (dev_fd_list[fd])
4874 dev_fd_list[fd] = 0;
4887 for (i = 0; nfds && i < totfds; i++)
4893 /* Take LIST, which is a snapshot copy of dev_fd_list from some point in
4894 the past, and close all open fds in dev_fd_list that are not marked
4895 as open in LIST. If LIST is NULL, close everything in dev_fd_list.
4896 LSIZE is the number of elements in LIST, in case it's larger than
4897 totfds (size of dev_fd_list). */
4899 close_new_fifos (list, lsize)
4907 unlink_fifo_list ();
4911 for (i = 0; i < lsize; i++)
4912 if (list[i] == 0 && i < totfds && dev_fd_list[i])
4915 for (i = lsize; i < totfds; i++)
4919 #if defined (NOTDEF)
4920 print_dev_fd_list ()
4924 fprintf (stderr, "pid %ld: dev_fd_list:", (long)getpid ());
4927 for (i = 0; i < totfds; i++)
4930 fprintf (stderr, " %d", i);
4932 fprintf (stderr, "\n");
4937 make_dev_fd_filename (fd)
4940 char *ret, intbuf[INT_STRLEN_BOUND (int) + 1], *p;
4942 ret = (char *)xmalloc (sizeof (DEV_FD_PREFIX) + 8);
4944 strcpy (ret, DEV_FD_PREFIX);
4945 p = inttostr (fd, intbuf, sizeof (intbuf));
4946 strcpy (ret + sizeof (DEV_FD_PREFIX) - 1, p);
4952 #endif /* HAVE_DEV_FD */
4954 /* Return a filename that will open a connection to the process defined by
4955 executing STRING. HAVE_DEV_FD, if defined, means open a pipe and return
4956 a filename in /dev/fd corresponding to a descriptor that is one of the
4957 ends of the pipe. If not defined, we use named pipes on systems that have
4958 them. Systems without /dev/fd and named pipes are out of luck.
4960 OPEN_FOR_READ_IN_CHILD, if 1, means open the named pipe for reading or
4961 use the read end of the pipe and dup that file descriptor to fd 0 in
4962 the child. If OPEN_FOR_READ_IN_CHILD is 0, we open the named pipe for
4963 writing or use the write end of the pipe in the child, and dup that
4964 file descriptor to fd 1 in the child. The parent does the opposite. */
4967 process_substitute (string, open_for_read_in_child)
4969 int open_for_read_in_child;
4974 #if defined (HAVE_DEV_FD)
4975 int parent_pipe_fd, child_pipe_fd;
4977 #endif /* HAVE_DEV_FD */
4978 #if defined (JOB_CONTROL)
4979 pid_t old_pipeline_pgrp;
4982 if (!string || !*string || wordexp_only)
4983 return ((char *)NULL);
4985 #if !defined (HAVE_DEV_FD)
4986 pathname = make_named_pipe ();
4987 #else /* HAVE_DEV_FD */
4988 if (pipe (fildes) < 0)
4990 sys_error (_("cannot make pipe for process substitution"));
4991 return ((char *)NULL);
4993 /* If OPEN_FOR_READ_IN_CHILD == 1, we want to use the write end of
4994 the pipe in the parent, otherwise the read end. */
4995 parent_pipe_fd = fildes[open_for_read_in_child];
4996 child_pipe_fd = fildes[1 - open_for_read_in_child];
4997 /* Move the parent end of the pipe to some high file descriptor, to
4998 avoid clashes with FDs used by the script. */
4999 parent_pipe_fd = move_to_high_fd (parent_pipe_fd, 1, 64);
5001 pathname = make_dev_fd_filename (parent_pipe_fd);
5002 #endif /* HAVE_DEV_FD */
5006 sys_error (_("cannot make pipe for process substitution"));
5007 return ((char *)NULL);
5010 old_pid = last_made_pid;
5012 #if defined (JOB_CONTROL)
5013 old_pipeline_pgrp = pipeline_pgrp;
5014 pipeline_pgrp = shell_pgrp;
5016 #endif /* JOB_CONTROL */
5018 pid = make_child ((char *)NULL, 1);
5021 reset_terminating_signals (); /* XXX */
5022 free_pushed_string_input ();
5023 /* Cancel traps, in trap.c. */
5024 restore_original_signals (); /* XXX - what about special builtins? bash-4.2 */
5025 setup_async_signals ();
5026 subshell_environment |= SUBSHELL_COMSUB|SUBSHELL_PROCSUB;
5029 #if defined (JOB_CONTROL)
5030 set_sigchld_handler ();
5031 stop_making_children ();
5032 /* XXX - should we only do this in the parent? (as in command subst) */
5033 pipeline_pgrp = old_pipeline_pgrp;
5034 #endif /* JOB_CONTROL */
5038 sys_error (_("cannot make child for process substitution"));
5040 #if defined (HAVE_DEV_FD)
5041 close (parent_pipe_fd);
5042 close (child_pipe_fd);
5043 #endif /* HAVE_DEV_FD */
5044 return ((char *)NULL);
5049 #if defined (JOB_CONTROL)
5050 restore_pipeline (1);
5053 #if !defined (HAVE_DEV_FD)
5054 fifo_list[nfifo-1].proc = pid;
5057 last_made_pid = old_pid;
5059 #if defined (JOB_CONTROL) && defined (PGRP_PIPE)
5061 #endif /* JOB_CONTROL && PGRP_PIPE */
5063 #if defined (HAVE_DEV_FD)
5064 close (child_pipe_fd);
5065 #endif /* HAVE_DEV_FD */
5070 set_sigint_handler ();
5072 #if defined (JOB_CONTROL)
5073 set_job_control (0);
5074 #endif /* JOB_CONTROL */
5076 #if !defined (HAVE_DEV_FD)
5077 /* Open the named pipe in the child. */
5078 fd = open (pathname, open_for_read_in_child ? O_RDONLY|O_NONBLOCK : O_WRONLY);
5081 /* Two separate strings for ease of translation. */
5082 if (open_for_read_in_child)
5083 sys_error (_("cannot open named pipe %s for reading"), pathname);
5085 sys_error (_("cannot open named pipe %s for writing"), pathname);
5089 if (open_for_read_in_child)
5091 if (sh_unset_nodelay_mode (fd) < 0)
5093 sys_error (_("cannot reset nodelay mode for fd %d"), fd);
5097 #else /* HAVE_DEV_FD */
5099 #endif /* HAVE_DEV_FD */
5101 if (dup2 (fd, open_for_read_in_child ? 0 : 1) < 0)
5103 sys_error (_("cannot duplicate named pipe %s as fd %d"), pathname,
5104 open_for_read_in_child ? 0 : 1);
5108 if (fd != (open_for_read_in_child ? 0 : 1))
5111 /* Need to close any files that this process has open to pipes inherited
5113 if (current_fds_to_close)
5115 close_fd_bitmap (current_fds_to_close);
5116 current_fds_to_close = (struct fd_bitmap *)NULL;
5119 #if defined (HAVE_DEV_FD)
5120 /* Make sure we close the parent's end of the pipe and clear the slot
5121 in the fd list so it is not closed later, if reallocated by, for
5122 instance, pipe(2). */
5123 close (parent_pipe_fd);
5124 dev_fd_list[parent_pipe_fd] = 0;
5125 #endif /* HAVE_DEV_FD */
5127 result = parse_and_execute (string, "process substitution", (SEVAL_NONINT|SEVAL_NOHIST));
5129 #if !defined (HAVE_DEV_FD)
5130 /* Make sure we close the named pipe in the child before we exit. */
5131 close (open_for_read_in_child ? 0 : 1);
5132 #endif /* !HAVE_DEV_FD */
5137 #endif /* PROCESS_SUBSTITUTION */
5139 /***********************************/
5141 /* Command Substitution */
5143 /***********************************/
5146 read_comsub (fd, quoted, rflag)
5150 char *istring, buf[128], *bufp, *s;
5151 int istring_index, istring_size, c, tflag, skip_ctlesc, skip_ctlnul;
5154 istring = (char *)NULL;
5155 istring_index = istring_size = bufn = tflag = 0;
5157 for (skip_ctlesc = skip_ctlnul = 0, s = ifs_value; s && *s; s++)
5158 skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL;
5160 /* Read the output of the command through the pipe. This may need to be
5161 changed to understand multibyte characters in the future. */
5168 bufn = zread (fd, buf, sizeof (buf));
5178 internal_warning ("read_comsub: ignored null byte in input");
5183 /* Add the character to ISTRING, possibly after resizing it. */
5184 RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, DEFAULT_ARRAY_SIZE);
5186 /* This is essentially quote_string inline */
5187 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) /* || c == CTLESC || c == CTLNUL */)
5188 istring[istring_index++] = CTLESC;
5189 /* Escape CTLESC and CTLNUL in the output to protect those characters
5190 from the rest of the word expansions (word splitting and globbing.)
5191 This is essentially quote_escapes inline. */
5192 else if (skip_ctlesc == 0 && c == CTLESC)
5194 tflag |= W_HASCTLESC;
5195 istring[istring_index++] = CTLESC;
5197 else if ((skip_ctlnul == 0 && c == CTLNUL) || (c == ' ' && (ifs_value && *ifs_value == 0)))
5198 istring[istring_index++] = CTLESC;
5200 istring[istring_index++] = c;
5203 #if defined (__CYGWIN__)
5204 if (c == '\n' && istring_index > 1 && istring[istring_index - 2] == '\r')
5207 istring[istring_index - 1] = '\n';
5214 istring[istring_index] = '\0';
5216 /* If we read no output, just return now and save ourselves some
5218 if (istring_index == 0)
5223 return (char *)NULL;
5226 /* Strip trailing newlines from the output of the command. */
5227 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
5229 while (istring_index > 0)
5231 if (istring[istring_index - 1] == '\n')
5235 /* If the newline was quoted, remove the quoting char. */
5236 if (istring[istring_index - 1] == CTLESC)
5242 istring[istring_index] = '\0';
5245 strip_trailing (istring, istring_index - 1, 1);
5252 /* Perform command substitution on STRING. This returns a WORD_DESC * with the
5253 contained string possibly quoted. */
5255 command_substitute (string, quoted)
5259 pid_t pid, old_pid, old_pipeline_pgrp, old_async_pid;
5261 int result, fildes[2], function_value, pflags, rc, tflag;
5264 istring = (char *)NULL;
5266 /* Don't fork () if there is no need to. In the case of no command to
5267 run, just return NULL. */
5268 if (!string || !*string || (string[0] == '\n' && !string[1]))
5269 return ((WORD_DESC *)NULL);
5271 if (wordexp_only && read_but_dont_execute)
5273 last_command_exit_value = EX_WEXPCOMSUB;
5274 jump_to_top_level (EXITPROG);
5277 /* We're making the assumption here that the command substitution will
5278 eventually run a command from the file system. Since we'll run
5279 maybe_make_export_env in this subshell before executing that command,
5280 the parent shell and any other shells it starts will have to remake
5281 the environment. If we make it before we fork, other shells won't
5282 have to. Don't bother if we have any temporary variable assignments,
5283 though, because the export environment will be remade after this
5284 command completes anyway, but do it if all the words to be expanded
5285 are variable assignments. */
5286 if (subst_assign_varlist == 0 || garglist == 0)
5287 maybe_make_export_env (); /* XXX */
5289 /* Flags to pass to parse_and_execute() */
5290 pflags = (interactive && sourcelevel == 0) ? SEVAL_RESETLINE : 0;
5292 /* Pipe the output of executing STRING into the current shell. */
5293 if (pipe (fildes) < 0)
5295 sys_error (_("cannot make pipe for command substitution"));
5299 old_pid = last_made_pid;
5300 #if defined (JOB_CONTROL)
5301 old_pipeline_pgrp = pipeline_pgrp;
5302 /* Don't reset the pipeline pgrp if we're already a subshell in a pipeline. */
5303 if ((subshell_environment & SUBSHELL_PIPE) == 0)
5304 pipeline_pgrp = shell_pgrp;
5305 cleanup_the_pipeline ();
5306 #endif /* JOB_CONTROL */
5308 old_async_pid = last_asynchronous_pid;
5309 pid = make_child ((char *)NULL, subshell_environment&SUBSHELL_ASYNC);
5310 last_asynchronous_pid = old_async_pid;
5314 /* Reset the signal handlers in the child, but don't free the
5315 trap strings. Set a flag noting that we have to free the
5316 trap strings if we run trap to change a signal disposition. */
5317 reset_signal_handlers ();
5318 subshell_environment |= SUBSHELL_RESETTRAP;
5321 #if defined (JOB_CONTROL)
5322 /* XXX DO THIS ONLY IN PARENT ? XXX */
5323 set_sigchld_handler ();
5324 stop_making_children ();
5326 pipeline_pgrp = old_pipeline_pgrp;
5328 stop_making_children ();
5329 #endif /* JOB_CONTROL */
5333 sys_error (_("cannot make child for command substitution"));
5339 return ((WORD_DESC *)NULL);
5344 set_sigint_handler (); /* XXX */
5346 free_pushed_string_input ();
5348 if (dup2 (fildes[1], 1) < 0)
5350 sys_error (_("command_substitute: cannot duplicate pipe as fd 1"));
5351 exit (EXECUTION_FAILURE);
5354 /* If standard output is closed in the parent shell
5355 (such as after `exec >&-'), file descriptor 1 will be
5356 the lowest available file descriptor, and end up in
5357 fildes[0]. This can happen for stdin and stderr as well,
5358 but stdout is more important -- it will cause no output
5359 to be generated from this command. */
5360 if ((fildes[1] != fileno (stdin)) &&
5361 (fildes[1] != fileno (stdout)) &&
5362 (fildes[1] != fileno (stderr)))
5365 if ((fildes[0] != fileno (stdin)) &&
5366 (fildes[0] != fileno (stdout)) &&
5367 (fildes[0] != fileno (stderr)))
5371 /* Let stdio know the fd may have changed from text to binary mode, and
5372 make sure to preserve stdout line buffering. */
5373 freopen (NULL, "w", stdout);
5374 sh_setlinebuf (stdout);
5375 #endif /* __CYGWIN__ */
5377 /* The currently executing shell is not interactive. */
5380 /* This is a subshell environment. */
5381 subshell_environment |= SUBSHELL_COMSUB;
5383 /* When not in POSIX mode, command substitution does not inherit
5385 if (posixly_correct == 0)
5386 exit_immediately_on_error = 0;
5388 remove_quoted_escapes (string);
5390 startup_state = 2; /* see if we can avoid a fork */
5391 /* Give command substitution a place to jump back to on failure,
5392 so we don't go back up to main (). */
5393 result = setjmp (top_level);
5395 /* If we're running a command substitution inside a shell function,
5396 trap `return' so we don't return from the function in the subshell
5397 and go off to never-never land. */
5398 if (result == 0 && return_catch_flag)
5399 function_value = setjmp (return_catch);
5403 if (result == ERREXIT)
5404 rc = last_command_exit_value;
5405 else if (result == EXITPROG)
5406 rc = last_command_exit_value;
5408 rc = EXECUTION_FAILURE;
5409 else if (function_value)
5410 rc = return_catch_value;
5414 rc = parse_and_execute (string, "command substitution", pflags|SEVAL_NOHIST);
5418 last_command_exit_value = rc;
5419 rc = run_exit_trap ();
5420 #if defined (PROCESS_SUBSTITUTION)
5421 unlink_fifo_list ();
5427 #if defined (JOB_CONTROL) && defined (PGRP_PIPE)
5429 #endif /* JOB_CONTROL && PGRP_PIPE */
5434 istring = read_comsub (fildes[0], quoted, &tflag);
5438 current_command_subst_pid = pid;
5439 last_command_exit_value = wait_for (pid);
5440 last_command_subst_pid = pid;
5441 last_made_pid = old_pid;
5443 #if defined (JOB_CONTROL)
5444 /* If last_command_exit_value > 128, then the substituted command
5445 was terminated by a signal. If that signal was SIGINT, then send
5446 SIGINT to ourselves. This will break out of loops, for instance. */
5447 if (last_command_exit_value == (128 + SIGINT) && last_command_exit_signal == SIGINT)
5448 kill (getpid (), SIGINT);
5450 /* wait_for gives the terminal back to shell_pgrp. If some other
5451 process group should have it, give it away to that group here.
5452 pipeline_pgrp is non-zero only while we are constructing a
5453 pipline, so what we are concerned about is whether or not that
5454 pipeline was started in the background. A pipeline started in
5455 the background should never get the tty back here. */
5456 if (interactive && pipeline_pgrp != (pid_t)0 && (subshell_environment & SUBSHELL_ASYNC) == 0)
5457 give_terminal_to (pipeline_pgrp, 0);
5458 #endif /* JOB_CONTROL */
5460 ret = alloc_word_desc ();
5461 ret->word = istring;
5468 /********************************************************
5470 * Utility functions for parameter expansion *
5472 ********************************************************/
5474 #if defined (ARRAY_VARS)
5477 array_length_reference (s)
5488 var = array_variable_part (s, &t, &len);
5490 /* If unbound variables should generate an error, report one and return
5492 if ((var == 0 || (assoc_p (var) == 0 && array_p (var) == 0)) && unbound_vars_is_error)
5496 last_command_exit_value = EXECUTION_FAILURE;
5504 /* We support a couple of expansions for variables that are not arrays.
5505 We'll return the length of the value for v[0], and 1 for v[@] or
5506 v[*]. Return 0 for everything else. */
5508 array = array_p (var) ? array_cell (var) : (ARRAY *)NULL;
5509 h = assoc_p (var) ? assoc_cell (var) : (HASH_TABLE *)NULL;
5511 if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']')
5514 return (h ? assoc_num_elements (h) : 0);
5515 else if (array_p (var))
5516 return (array ? array_num_elements (array) : 0);
5518 return (var_isset (var) ? 1 : 0);
5524 akey = expand_assignment_string_to_string (t, 0); /* [ */
5526 if (akey == 0 || *akey == 0)
5528 err_badarraysub (t);
5531 t = assoc_reference (assoc_cell (var), akey);
5535 ind = array_expand_index (t, len);
5538 err_badarraysub (t);
5542 t = array_reference (array, ind);
5544 t = (ind == 0) ? value_cell (var) : (char *)NULL;
5547 len = MB_STRLEN (t);
5550 #endif /* ARRAY_VARS */
5553 valid_brace_expansion_word (name, var_is_special)
5557 if (DIGIT (*name) && all_digits (name))
5559 else if (var_is_special)
5561 #if defined (ARRAY_VARS)
5562 else if (valid_array_reference (name))
5564 #endif /* ARRAY_VARS */
5565 else if (legal_identifier (name))
5572 chk_atstar (name, quoted, quoted_dollar_atp, contains_dollar_at)
5575 int *quoted_dollar_atp, *contains_dollar_at;
5581 if (quoted_dollar_atp)
5582 *quoted_dollar_atp = 0;
5583 if (contains_dollar_at)
5584 *contains_dollar_at = 0;
5588 /* check for $@ and $* */
5589 if (name[0] == '@' && name[1] == 0)
5591 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
5592 *quoted_dollar_atp = 1;
5593 if (contains_dollar_at)
5594 *contains_dollar_at = 1;
5597 else if (name[0] == '*' && name[1] == '\0' && quoted == 0)
5599 if (contains_dollar_at)
5600 *contains_dollar_at = 1;
5604 /* Now check for ${array[@]} and ${array[*]} */
5605 #if defined (ARRAY_VARS)
5606 else if (valid_array_reference (name))
5608 temp1 = mbschr (name, '[');
5609 if (temp1 && temp1[1] == '@' && temp1[2] == ']')
5611 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
5612 *quoted_dollar_atp = 1;
5613 if (contains_dollar_at)
5614 *contains_dollar_at = 1;
5617 /* ${array[*]}, when unquoted, should be treated like ${array[@]},
5618 which should result in separate words even when IFS is unset. */
5619 if (temp1 && temp1[1] == '*' && temp1[2] == ']' && quoted == 0)
5621 if (contains_dollar_at)
5622 *contains_dollar_at = 1;
5630 /* Parameter expand NAME, and return a new string which is the expansion,
5631 or NULL if there was no expansion.
5632 VAR_IS_SPECIAL is non-zero if NAME is one of the special variables in
5633 the shell, e.g., "@", "$", "*", etc. QUOTED, if non-zero, means that
5634 NAME was found inside of a double-quoted expression. */
5636 parameter_brace_expand_word (name, var_is_special, quoted, pflags, indp)
5638 int var_is_special, quoted, pflags;
5655 /* Handle multiple digit arguments, as in ${11}. */
5656 if (legal_number (name, &arg_index))
5658 tt = get_dollar_var_value (arg_index);
5660 temp = (*tt && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
5662 : quote_escapes (tt);
5664 temp = (char *)NULL;
5667 else if (var_is_special) /* ${@} */
5670 tt = (char *)xmalloc (2 + strlen (name));
5671 tt[sindex = 0] = '$';
5672 strcpy (tt + 1, name);
5674 ret = param_expand (tt, &sindex, quoted, (int *)NULL, (int *)NULL,
5675 (int *)NULL, (int *)NULL, pflags);
5678 #if defined (ARRAY_VARS)
5679 else if (valid_array_reference (name))
5681 temp = array_value (name, quoted, 0, &atype, &ind);
5682 if (atype == 0 && temp)
5684 temp = (*temp && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
5685 ? quote_string (temp)
5686 : quote_escapes (temp);
5687 rflags |= W_ARRAYIND;
5691 else if (atype == 1 && temp && QUOTED_NULL (temp) && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
5692 rflags |= W_HASQUOTEDNULL;
5695 else if (var = find_variable (name))
5697 if (var_isset (var) && invisible_p (var) == 0)
5699 #if defined (ARRAY_VARS)
5701 temp = assoc_reference (assoc_cell (var), "0");
5702 else if (array_p (var))
5703 temp = array_reference (array_cell (var), 0);
5705 temp = value_cell (var);
5707 temp = value_cell (var);
5711 temp = (*temp && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
5712 ? quote_string (temp)
5713 : quote_escapes (temp);
5716 temp = (char *)NULL;
5719 temp = (char *)NULL;
5723 ret = alloc_word_desc ();
5725 ret->flags |= rflags;
5730 /* Expand an indirect reference to a variable: ${!NAME} expands to the
5731 value of the variable whose name is the value of NAME. */
5733 parameter_brace_expand_indir (name, var_is_special, quoted, quoted_dollar_atp, contains_dollar_at)
5735 int var_is_special, quoted;
5736 int *quoted_dollar_atp, *contains_dollar_at;
5741 w = parameter_brace_expand_word (name, var_is_special, quoted, PF_IGNUNBOUND, 0);
5743 /* Have to dequote here if necessary */
5746 temp = (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))
5747 ? dequote_string (t)
5748 : dequote_escapes (t);
5752 dispose_word_desc (w);
5754 chk_atstar (t, quoted, quoted_dollar_atp, contains_dollar_at);
5756 return (WORD_DESC *)NULL;
5758 w = parameter_brace_expand_word (t, SPECIAL_VAR(t, 0), quoted, 0, 0);
5764 /* Expand the right side of a parameter expansion of the form ${NAMEcVALUE},
5765 depending on the value of C, the separating character. C can be one of
5766 "-", "+", or "=". QUOTED is true if the entire brace expression occurs
5767 between double quotes. */
5769 parameter_brace_expand_rhs (name, value, c, quoted, qdollaratp, hasdollarat)
5771 int c, quoted, *qdollaratp, *hasdollarat;
5775 char *t, *t1, *temp;
5778 /* If the entire expression is between double quotes, we want to treat
5779 the value as a double-quoted string, with the exception that we strip
5780 embedded unescaped double quotes (for sh backwards compatibility). */
5781 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *value)
5784 temp = string_extract_double_quoted (value, &hasdol, 1);
5789 w = alloc_word_desc ();
5791 /* XXX was 0 not quoted */
5792 l = *temp ? expand_string_for_rhs (temp, quoted, &hasdol, (int *)NULL)
5795 *hasdollarat = hasdol || (l && l->next);
5800 /* The expansion of TEMP returned something. We need to treat things
5801 slightly differently if HASDOL is non-zero. If we have "$@", the
5802 individual words have already been quoted. We need to turn them
5803 into a string with the words separated by the first character of
5804 $IFS without any additional quoting, so string_list_dollar_at won't
5805 do the right thing. We use string_list_dollar_star instead. */
5806 temp = (hasdol || l->next) ? string_list_dollar_star (l) : string_list (l);
5808 /* If l->next is not null, we know that TEMP contained "$@", since that
5809 is the only expansion that creates more than one word. */
5810 if (qdollaratp && ((hasdol && quoted) || l->next))
5814 else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && hasdol)
5816 /* The brace expansion occurred between double quotes and there was
5817 a $@ in TEMP. It does not matter if the $@ is quoted, as long as
5818 it does not expand to anything. In this case, we want to return
5819 a quoted empty string. */
5820 temp = make_quoted_char ('\0');
5821 w->flags |= W_HASQUOTEDNULL;
5824 temp = (char *)NULL;
5826 if (c == '-' || c == '+')
5833 t = temp ? savestring (temp) : savestring ("");
5834 t1 = dequote_string (t);
5836 #if defined (ARRAY_VARS)
5837 if (valid_array_reference (name))
5838 assign_array_element (name, t1, 0);
5840 #endif /* ARRAY_VARS */
5841 bind_variable (name, t1, 0);
5843 /* From Posix group discussion Feb-March 2010. Issue 7 0000221 */
5850 /* Deal with the right hand side of a ${name:?value} expansion in the case
5851 that NAME is null or not set. If VALUE is non-null it is expanded and
5852 used as the error message to print, otherwise a standard message is
5855 parameter_brace_expand_error (name, value)
5861 if (value && *value)
5863 l = expand_string (value, 0);
5864 temp = string_list (l);
5865 report_error ("%s: %s", name, temp ? temp : ""); /* XXX was value not "" */
5870 report_error (_("%s: parameter null or not set"), name);
5872 /* Free the data we have allocated during this expansion, since we
5873 are about to longjmp out. */
5878 /* Return 1 if NAME is something for which parameter_brace_expand_length is
5881 valid_length_expression (name)
5884 return (name[1] == '\0' || /* ${#} */
5885 ((sh_syntaxtab[(unsigned char) name[1]] & CSPECVAR) && name[2] == '\0') || /* special param */
5886 (DIGIT (name[1]) && all_digits (name + 1)) || /* ${#11} */
5887 #if defined (ARRAY_VARS)
5888 valid_array_reference (name + 1) || /* ${#a[7]} */
5890 legal_identifier (name + 1)); /* ${#PS1} */
5893 /* Handle the parameter brace expansion that requires us to return the
5894 length of a parameter. */
5896 parameter_brace_expand_length (name)
5900 intmax_t number, arg_index;
5902 #if defined (ARRAY_VARS)
5906 if (name[1] == '\0') /* ${#} */
5907 number = number_of_args ();
5908 else if ((name[1] == '@' || name[1] == '*') && name[2] == '\0') /* ${#@}, ${#*} */
5909 number = number_of_args ();
5910 else if ((sh_syntaxtab[(unsigned char) name[1]] & CSPECVAR) && name[2] == '\0')
5912 /* Take the lengths of some of the shell's special parameters. */
5916 t = which_set_flags ();
5919 t = itos (last_command_exit_value);
5922 t = itos (dollar_dollar_pid);
5925 if (last_asynchronous_pid == NO_PID)
5926 t = (char *)NULL; /* XXX - error if set -u set? */
5928 t = itos (last_asynchronous_pid);
5931 t = itos (number_of_args ());
5934 number = STRLEN (t);
5937 #if defined (ARRAY_VARS)
5938 else if (valid_array_reference (name + 1))
5939 number = array_length_reference (name + 1);
5940 #endif /* ARRAY_VARS */
5945 if (legal_number (name + 1, &arg_index)) /* ${#1} */
5947 t = get_dollar_var_value (arg_index);
5948 if (t == 0 && unbound_vars_is_error)
5950 number = MB_STRLEN (t);
5953 #if defined (ARRAY_VARS)
5954 else if ((var = find_variable (name + 1)) && (invisible_p (var) == 0) && (array_p (var) || assoc_p (var)))
5957 t = assoc_reference (assoc_cell (var), "0");
5959 t = array_reference (array_cell (var), 0);
5960 if (t == 0 && unbound_vars_is_error)
5962 number = MB_STRLEN (t);
5967 newname = savestring (name);
5969 list = expand_string (newname, Q_DOUBLE_QUOTES);
5970 t = list ? string_list (list) : (char *)NULL;
5973 dispose_words (list);
5975 number = t ? MB_STRLEN (t) : 0;
5983 /* Skip characters in SUBSTR until DELIM. SUBSTR is an arithmetic expression,
5984 so we do some ad-hoc parsing of an arithmetic expression to find
5985 the first DELIM, instead of using strchr(3). Two rules:
5986 1. If the substring contains a `(', read until closing `)'.
5987 2. If the substring contains a `?', read past one `:' for each `?'.
5991 skiparith (substr, delim)
5996 int skipcol, pcount, i;
5999 sublen = strlen (substr);
6000 i = skipcol = pcount = 0;
6003 /* Balance parens */
6004 if (substr[i] == LPAREN)
6010 if (substr[i] == RPAREN && pcount)
6018 ADVANCE_CHAR (substr, sublen, i);
6022 /* Skip one `:' for each `?' */
6023 if (substr[i] == ':' && skipcol)
6029 if (substr[i] == delim)
6031 if (substr[i] == '?')
6037 ADVANCE_CHAR (substr, sublen, i);
6040 return (substr + i);
6043 /* Verify and limit the start and end of the desired substring. If
6044 VTYPE == 0, a regular shell variable is being used; if it is 1,
6045 then the positional parameters are being used; if it is 2, then
6046 VALUE is really a pointer to an array variable that should be used.
6047 Return value is 1 if both values were OK, 0 if there was a problem
6048 with an invalid expression, or -1 if the values were out of range. */
6050 verify_substring_values (v, value, substr, vtype, e1p, e2p)
6052 char *value, *substr;
6054 intmax_t *e1p, *e2p;
6056 char *t, *temp1, *temp2;
6059 #if defined (ARRAY_VARS)
6064 /* duplicate behavior of strchr(3) */
6065 t = skiparith (substr, ':');
6066 if (*t && *t == ':')
6071 temp1 = expand_arith_string (substr, Q_DOUBLE_QUOTES);
6072 *e1p = evalexp (temp1, &expok);
6077 len = -1; /* paranoia */
6081 case VT_ARRAYMEMBER:
6082 len = MB_STRLEN (value);
6085 len = number_of_args () + 1;
6087 len++; /* add one arg if counting from $0 */
6089 #if defined (ARRAY_VARS)
6091 /* For arrays, the first value deals with array indices. Negative
6092 offsets count from one past the array's maximum index. Associative
6093 arrays treat the number of elements as the maximum index. */
6097 len = assoc_num_elements (h) + (*e1p < 0);
6102 len = array_max_index (a) + (*e1p < 0); /* arrays index from 0 to n - 1 */
6108 if (len == -1) /* paranoia */
6111 if (*e1p < 0) /* negative offsets count from end */
6114 if (*e1p > len || *e1p < 0)
6117 #if defined (ARRAY_VARS)
6118 /* For arrays, the second offset deals with the number of elements. */
6119 if (vtype == VT_ARRAYVAR)
6120 len = assoc_p (v) ? assoc_num_elements (h) : array_num_elements (a);
6126 temp2 = savestring (t);
6127 temp1 = expand_arith_string (temp2, Q_DOUBLE_QUOTES);
6130 *e2p = evalexp (temp1, &expok);
6134 if ((vtype == VT_ARRAYVAR || vtype == VT_POSPARMS) && *e2p < 0)
6136 internal_error (_("%s: substring expression < 0"), t);
6139 #if defined (ARRAY_VARS)
6140 /* In order to deal with sparse arrays, push the intelligence about how
6141 to deal with the number of elements desired down to the array-
6142 specific functions. */
6143 if (vtype != VT_ARRAYVAR)
6149 if (*e2p < 0 || *e2p < *e1p)
6151 internal_error (_("%s: substring expression < 0"), t);
6156 *e2p += *e1p; /* want E2 chars starting at E1 */
6167 /* Return the type of variable specified by VARNAME (simple variable,
6168 positional param, or array variable). Also return the value specified
6169 by VARNAME (value of a variable or a reference to an array element).
6170 QUOTED is the standard description of quoting state, using Q_* defines.
6171 FLAGS is currently a set of flags to pass to array_value. If IND is
6172 non-null and not INTMAX_MIN, and FLAGS includes AV_USEIND, IND is
6173 passed to array_value so the array index is not computed again.
6174 If this returns VT_VARIABLE, the caller assumes that CTLESC and CTLNUL
6175 characters in the value are quoted with CTLESC and takes appropriate
6176 steps. For convenience, *VALP is set to the dequoted VALUE. */
6178 get_var_and_type (varname, value, ind, quoted, flags, varp, valp)
6179 char *varname, *value;
6187 #if defined (ARRAY_VARS)
6192 /* This sets vtype to VT_VARIABLE or VT_POSPARMS */
6193 vtype = (varname[0] == '@' || varname[0] == '*') && varname[1] == '\0';
6194 if (vtype == VT_POSPARMS && varname[0] == '*')
6195 vtype |= VT_STARSUB;
6196 *varp = (SHELL_VAR *)NULL;
6198 #if defined (ARRAY_VARS)
6199 if (valid_array_reference (varname))
6201 v = array_variable_part (varname, &temp, (int *)0);
6202 /* If we want to signal array_value to use an already-computed index,
6203 set LIND to that index */
6204 lind = (ind != INTMAX_MIN && (flags & AV_USEIND)) ? ind : 0;
6205 if (v && (array_p (v) || assoc_p (v)))
6207 if (ALL_ELEMENT_SUB (temp[0]) && temp[1] == ']')
6209 /* Callers have to differentiate betwen indexed and associative */
6210 vtype = VT_ARRAYVAR;
6212 vtype |= VT_STARSUB;
6213 *valp = array_p (v) ? (char *)array_cell (v) : (char *)assoc_cell (v);
6217 vtype = VT_ARRAYMEMBER;
6218 *valp = array_value (varname, Q_DOUBLE_QUOTES, flags, (int *)NULL, &lind);
6222 else if (v && (ALL_ELEMENT_SUB (temp[0]) && temp[1] == ']'))
6224 vtype = VT_VARIABLE;
6226 if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))
6227 *valp = dequote_string (value);
6229 *valp = dequote_escapes (value);
6233 vtype = VT_ARRAYMEMBER;
6235 *valp = array_value (varname, Q_DOUBLE_QUOTES, flags, (int *)NULL, &lind);
6238 else if ((v = find_variable (varname)) && (invisible_p (v) == 0) && (assoc_p (v) || array_p (v)))
6240 vtype = VT_ARRAYMEMBER;
6242 *valp = assoc_p (v) ? assoc_reference (assoc_cell (v), "0") : array_reference (array_cell (v), 0);
6247 if (value && vtype == VT_VARIABLE)
6249 if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))
6250 *valp = dequote_string (value);
6252 *valp = dequote_escapes (value);
6261 /******************************************************/
6263 /* Functions to extract substrings of variable values */
6265 /******************************************************/
6267 #if defined (HANDLE_MULTIBYTE)
6268 /* Character-oriented rather than strictly byte-oriented substrings. S and
6269 E, rather being strict indices into STRING, indicate character (possibly
6270 multibyte character) positions that require calculation.
6271 Used by the ${param:offset[:length]} expansion. */
6273 mb_substring (string, s, e)
6278 int start, stop, i, slen;
6282 /* Don't need string length in ADVANCE_CHAR unless multibyte chars possible. */
6283 slen = (MB_CUR_MAX > 1) ? STRLEN (string) : 0;
6286 while (string[start] && i--)
6287 ADVANCE_CHAR (string, slen, start);
6290 while (string[stop] && i--)
6291 ADVANCE_CHAR (string, slen, stop);
6292 tt = substring (string, start, stop);
6297 /* Process a variable substring expansion: ${name:e1[:e2]}. If VARNAME
6298 is `@', use the positional parameters; otherwise, use the value of
6299 VARNAME. If VARNAME is an array variable, use the array elements. */
6302 parameter_brace_substring (varname, value, ind, substr, quoted, flags)
6303 char *varname, *value;
6309 int vtype, r, starsub;
6310 char *temp, *val, *tt, *oname;
6314 return ((char *)NULL);
6316 oname = this_command_name;
6317 this_command_name = varname;
6319 vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val);
6322 this_command_name = oname;
6323 return ((char *)NULL);
6326 starsub = vtype & VT_STARSUB;
6327 vtype &= ~VT_STARSUB;
6329 r = verify_substring_values (v, val, substr, vtype, &e1, &e2);
6330 this_command_name = oname;
6332 return ((r == 0) ? &expand_param_error : (char *)NULL);
6337 case VT_ARRAYMEMBER:
6338 #if defined (HANDLE_MULTIBYTE)
6340 tt = mb_substring (val, e1, e2);
6343 tt = substring (val, e1, e2);
6345 if (vtype == VT_VARIABLE)
6347 if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))
6348 temp = quote_string (tt);
6350 temp = tt ? quote_escapes (tt) : (char *)NULL;
6354 tt = pos_params (varname, e1, e2, quoted);
6355 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) == 0)
6357 temp = tt ? quote_escapes (tt) : (char *)NULL;
6363 #if defined (ARRAY_VARS)
6366 /* we convert to list and take first e2 elements starting at e1th
6367 element -- officially undefined for now */
6368 temp = assoc_subrange (assoc_cell (v), e1, e2, starsub, quoted);
6370 /* We want E2 to be the number of elements desired (arrays can be sparse,
6371 so verify_substring_values just returns the numbers specified and we
6372 rely on array_subrange to understand how to deal with them). */
6373 temp = array_subrange (array_cell (v), e1, e2, starsub, quoted);
6374 /* array_subrange now calls array_quote_escapes as appropriate, so the
6375 caller no longer needs to. */
6379 temp = (char *)NULL;
6385 /****************************************************************/
6387 /* Functions to perform pattern substitution on variable values */
6389 /****************************************************************/
6392 shouldexp_replacement (s)
6397 for (p = s; p && *p; p++)
6408 pat_subst (string, pat, rep, mflags)
6409 char *string, *pat, *rep;
6412 char *ret, *s, *e, *str, *rstr, *mstr;
6413 int rsize, rptr, l, replen, mtype, rxpand, rslen, mlen;
6416 return (savestring (""));
6418 mtype = mflags & MATCH_TYPEMASK;
6420 #if 0 /* bash-4.2 ? */
6421 rxpand = (rep && *rep) ? shouldexp_replacement (rep) : 0;
6427 * 1. A null pattern with mtype == MATCH_BEG means to prefix STRING
6428 * with REP and return the result.
6429 * 2. A null pattern with mtype == MATCH_END means to append REP to
6430 * STRING and return the result.
6431 * These don't understand or process `&' in the replacement string.
6433 if ((pat == 0 || *pat == 0) && (mtype == MATCH_BEG || mtype == MATCH_END))
6435 replen = STRLEN (rep);
6436 l = STRLEN (string);
6437 ret = (char *)xmalloc (replen + l + 2);
6439 strcpy (ret, string);
6440 else if (mtype == MATCH_BEG)
6443 strcpy (ret + replen, string);
6447 strcpy (ret, string);
6448 strcpy (ret + l, rep);
6453 ret = (char *)xmalloc (rsize = 64);
6456 for (replen = STRLEN (rep), rptr = 0, str = string;;)
6458 if (match_pattern (str, pat, mtype, &s, &e) == 0)
6466 mstr = xmalloc (mlen + 1);
6467 for (x = 0; x < mlen; x++)
6470 rstr = strcreplace (rep, '&', mstr, 0);
6471 rslen = strlen (rstr);
6479 RESIZE_MALLOCED_BUFFER (ret, rptr, (l + rslen), rsize, 64);
6481 /* OK, now copy the leading unmatched portion of the string (from
6482 str to s) to ret starting at rptr (the current offset). Then copy
6483 the replacement string at ret + rptr + (s - str). Increment
6484 rptr (if necessary) and str and go on. */
6487 strncpy (ret + rptr, str, l);
6492 strncpy (ret + rptr, rstr, rslen);
6495 str = e; /* e == end of match */
6500 if (((mflags & MATCH_GLOBREP) == 0) || mtype != MATCH_ANY)
6505 /* On a zero-length match, make sure we copy one character, since
6506 we increment one character to avoid infinite recursion. */
6507 RESIZE_MALLOCED_BUFFER (ret, rptr, 1, rsize, 64);
6508 ret[rptr++] = *str++;
6509 e++; /* avoid infinite recursion on zero-length match */
6513 /* Now copy the unmatched portion of the input string */
6516 RESIZE_MALLOCED_BUFFER (ret, rptr, STRLEN(str) + 1, rsize, 64);
6517 strcpy (ret + rptr, str);
6525 /* Do pattern match and replacement on the positional parameters. */
6527 pos_params_pat_subst (string, pat, rep, mflags)
6528 char *string, *pat, *rep;
6531 WORD_LIST *save, *params;
6536 save = params = list_rest_of_args ();
6538 return ((char *)NULL);
6540 for ( ; params; params = params->next)
6542 ret = pat_subst (params->word->word, pat, rep, mflags);
6543 w = alloc_word_desc ();
6544 w->word = ret ? ret : savestring ("");
6545 dispose_word (params->word);
6549 pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@';
6550 qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0;
6553 if ((mflags & (MATCH_QUOTED|MATCH_STARSUB)) == (MATCH_QUOTED|MATCH_STARSUB))
6554 ret = string_list_dollar_star (quote_list (save));
6555 else if ((mflags & MATCH_STARSUB) == MATCH_STARSUB)
6556 ret = string_list_dollar_star (save);
6557 else if ((mflags & MATCH_QUOTED) == MATCH_QUOTED)
6558 ret = string_list_dollar_at (save, qflags);
6560 ret = string_list_dollar_star (save);
6562 ret = string_list_pos_params (pchar, save, qflags);
6565 dispose_words (save);
6570 /* Perform pattern substitution on VALUE, which is the expansion of
6571 VARNAME. PATSUB is an expression supplying the pattern to match
6572 and the string to substitute. QUOTED is a flags word containing
6573 the type of quoting currently in effect. */
6575 parameter_brace_patsub (varname, value, ind, patsub, quoted, flags)
6576 char *varname, *value;
6581 int vtype, mflags, starsub, delim;
6582 char *val, *temp, *pat, *rep, *p, *lpatsub, *tt;
6586 return ((char *)NULL);
6588 this_command_name = varname;
6590 vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val);
6592 return ((char *)NULL);
6594 starsub = vtype & VT_STARSUB;
6595 vtype &= ~VT_STARSUB;
6598 if (patsub && *patsub == '/')
6600 mflags |= MATCH_GLOBREP;
6604 /* Malloc this because expand_string_if_necessary or one of the expansion
6605 functions in its call chain may free it on a substitution error. */
6606 lpatsub = savestring (patsub);
6608 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
6609 mflags |= MATCH_QUOTED;
6612 mflags |= MATCH_STARSUB;
6614 /* If the pattern starts with a `/', make sure we skip over it when looking
6615 for the replacement delimiter. */
6617 if (rep = quoted_strchr ((*patsub == '/') ? lpatsub+1 : lpatsub, '/', ST_BACKSL))
6622 delim = skip_to_delim (lpatsub, ((*patsub == '/') ? 1 : 0), "/", 0);
6623 if (lpatsub[delim] == '/')
6626 rep = lpatsub + delim + 1;
6632 if (rep && *rep == '\0')
6635 /* Perform the same expansions on the pattern as performed by the
6636 pattern removal expansions. */
6637 pat = getpattern (lpatsub, quoted, 1);
6641 if ((mflags & MATCH_QUOTED) == 0)
6642 rep = expand_string_if_necessary (rep, quoted, expand_string_unsplit);
6644 rep = expand_string_to_string_internal (rep, quoted, expand_string_unsplit);
6647 /* ksh93 doesn't allow the match specifier to be a part of the expanded
6648 pattern. This is an extension. Make sure we don't anchor the pattern
6649 at the beginning or end of the string if we're doing global replacement,
6652 if (mflags & MATCH_GLOBREP)
6653 mflags |= MATCH_ANY;
6654 else if (pat && pat[0] == '#')
6656 mflags |= MATCH_BEG;
6659 else if (pat && pat[0] == '%')
6661 mflags |= MATCH_END;
6665 mflags |= MATCH_ANY;
6667 /* OK, we now want to substitute REP for PAT in VAL. If
6668 flags & MATCH_GLOBREP is non-zero, the substitution is done
6669 everywhere, otherwise only the first occurrence of PAT is
6670 replaced. The pattern matching code doesn't understand
6671 CTLESC quoting CTLESC and CTLNUL so we use the dequoted variable
6672 values passed in (VT_VARIABLE) so the pattern substitution
6673 code works right. We need to requote special chars after
6674 we're done for VT_VARIABLE and VT_ARRAYMEMBER, and for the
6675 other cases if QUOTED == 0, since the posparams and arrays
6676 indexed by * or @ do special things when QUOTED != 0. */
6681 case VT_ARRAYMEMBER:
6682 temp = pat_subst (val, p, rep, mflags);
6683 if (vtype == VT_VARIABLE)
6687 tt = (mflags & MATCH_QUOTED) ? quote_string (temp) : quote_escapes (temp);
6693 temp = pos_params_pat_subst (val, p, rep, mflags);
6694 if (temp && (mflags & MATCH_QUOTED) == 0)
6696 tt = quote_escapes (temp);
6701 #if defined (ARRAY_VARS)
6703 temp = assoc_p (v) ? assoc_patsub (assoc_cell (v), p, rep, mflags)
6704 : array_patsub (array_cell (v), p, rep, mflags);
6705 /* Don't call quote_escapes anymore; array_patsub calls
6706 array_quote_escapes as appropriate before adding the
6707 space separators; ditto for assoc_patsub. */
6719 /****************************************************************/
6721 /* Functions to perform case modification on variable values */
6723 /****************************************************************/
6725 /* Do case modification on the positional parameters. */
6728 pos_params_modcase (string, pat, modop, mflags)
6733 WORD_LIST *save, *params;
6738 save = params = list_rest_of_args ();
6740 return ((char *)NULL);
6742 for ( ; params; params = params->next)
6744 ret = sh_modcase (params->word->word, pat, modop);
6745 w = alloc_word_desc ();
6746 w->word = ret ? ret : savestring ("");
6747 dispose_word (params->word);
6751 pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@';
6752 qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0;
6754 ret = string_list_pos_params (pchar, save, qflags);
6755 dispose_words (save);
6760 /* Perform case modification on VALUE, which is the expansion of
6761 VARNAME. MODSPEC is an expression supplying the type of modification
6762 to perform. QUOTED is a flags word containing the type of quoting
6763 currently in effect. */
6765 parameter_brace_casemod (varname, value, ind, modspec, patspec, quoted, flags)
6766 char *varname, *value;
6771 int vtype, starsub, modop, mflags, x;
6772 char *val, *temp, *pat, *p, *lpat, *tt;
6776 return ((char *)NULL);
6778 this_command_name = varname;
6780 vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val);
6782 return ((char *)NULL);
6784 starsub = vtype & VT_STARSUB;
6785 vtype &= ~VT_STARSUB;
6789 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
6790 mflags |= MATCH_QUOTED;
6792 mflags |= MATCH_STARSUB;
6797 x = p && p[0] == modspec;
6798 modop = x ? CASE_UPPER : CASE_UPFIRST;
6801 else if (modspec == ',')
6803 x = p && p[0] == modspec;
6804 modop = x ? CASE_LOWER : CASE_LOWFIRST;
6807 else if (modspec == '~')
6809 x = p && p[0] == modspec;
6810 modop = x ? CASE_TOGGLEALL : CASE_TOGGLE;
6814 lpat = p ? savestring (p) : 0;
6815 /* Perform the same expansions on the pattern as performed by the
6816 pattern removal expansions. FOR LATER */
6817 pat = lpat ? getpattern (lpat, quoted, 1) : 0;
6819 /* OK, now we do the case modification. */
6823 case VT_ARRAYMEMBER:
6824 temp = sh_modcase (val, pat, modop);
6825 if (vtype == VT_VARIABLE)
6829 tt = (mflags & MATCH_QUOTED) ? quote_string (temp) : quote_escapes (temp);
6836 temp = pos_params_modcase (val, pat, modop, mflags);
6837 if (temp && (mflags & MATCH_QUOTED) == 0)
6839 tt = quote_escapes (temp);
6845 #if defined (ARRAY_VARS)
6847 temp = assoc_p (v) ? assoc_modcase (assoc_cell (v), pat, modop, mflags)
6848 : array_modcase (array_cell (v), pat, modop, mflags);
6849 /* Don't call quote_escapes; array_modcase calls array_quote_escapes
6850 as appropriate before adding the space separators; ditto for
6862 /* Check for unbalanced parens in S, which is the contents of $(( ... )). If
6863 any occur, this must be a nested command substitution, so return 0.
6864 Otherwise, return 1. A valid arithmetic expression must always have a
6865 ( before a matching ), so any cases where there are more right parens
6866 means that this must not be an arithmetic expression, though the parser
6867 will not accept it without a balanced total number of parens. */
6869 chk_arithsub (s, len)
6881 else if (s[i] == RPAREN)
6891 ADVANCE_CHAR (s, len, i);
6897 ADVANCE_CHAR (s, len, i);
6901 i = skip_single_quoted (s, len, ++i);
6905 i = skip_double_quoted ((char *)s, len, ++i);
6910 return (count == 0);
6913 /****************************************************************/
6915 /* Functions to perform parameter expansion on a string */
6917 /****************************************************************/
6919 /* ${[#][!]name[[:][^[^]][,[,]]#[#]%[%]-=?+[word][:e1[:e2]]]} */
6921 parameter_brace_expand (string, indexp, quoted, pflags, quoted_dollar_atp, contains_dollar_at)
6923 int *indexp, quoted, *quoted_dollar_atp, *contains_dollar_at, pflags;
6925 int check_nullness, var_is_set, var_is_null, var_is_special;
6926 int want_substring, want_indir, want_patsub, want_casemod;
6927 char *name, *value, *temp, *temp1;
6928 WORD_DESC *tdesc, *ret;
6929 int t_index, sindex, c, tflag, modspec;
6933 temp = temp1 = value = (char *)NULL;
6934 var_is_set = var_is_null = var_is_special = check_nullness = 0;
6935 want_substring = want_indir = want_patsub = want_casemod = 0;
6939 /* ${#var} doesn't have any of the other parameter expansions on it. */
6940 if (string[t_index] == '#' && legal_variable_starter (string[t_index+1])) /* {{ */
6941 name = string_extract (string, &t_index, "}", SX_VARNAME);
6943 #if defined (CASEMOD_EXPANSIONS)
6944 /* To enable case-toggling expansions using the `~' operator character
6945 change the 1 to 0. */
6946 # if defined (CASEMOD_CAPCASE)
6947 name = string_extract (string, &t_index, "#%^,~:-=?+/}", SX_VARNAME);
6949 name = string_extract (string, &t_index, "#%^,:-=?+/}", SX_VARNAME);
6950 # endif /* CASEMOD_CAPCASE */
6952 name = string_extract (string, &t_index, "#%:-=?+/}", SX_VARNAME);
6953 #endif /* CASEMOD_EXPANSIONS */
6960 /* If the name really consists of a special variable, then make sure
6961 that we have the entire name. We don't allow indirect references
6962 to special variables except `#', `?', `@' and `*'. */
6963 if ((sindex == t_index && VALID_SPECIAL_LENGTH_PARAM (string[t_index])) ||
6964 (sindex == t_index - 1 && string[sindex] == '!' && VALID_INDIR_PARAM (string[t_index])))
6968 temp1 = string_extract (string, &t_index, "#%:-=?+/}", 0);
6969 name = (char *)xmalloc (3 + (strlen (temp1)));
6970 *name = string[sindex];
6971 if (string[sindex] == '!')
6973 /* indirect reference of $#, $?, $@, or $* */
6974 name[1] = string[sindex + 1];
6975 strcpy (name + 2, temp1);
6978 strcpy (name + 1, temp1);
6983 /* Find out what character ended the variable name. Then
6984 do the appropriate thing. */
6985 if (c = string[sindex])
6988 /* If c is followed by one of the valid parameter expansion
6989 characters, move past it as normal. If not, assume that
6990 a substring specification is being given, and do not move
6992 if (c == ':' && VALID_PARAM_EXPAND_CHAR (string[sindex]))
6995 if (c = string[sindex])
6998 else if (c == ':' && string[sindex] != RBRACE)
7000 else if (c == '/' && string[sindex] != RBRACE)
7002 #if defined (CASEMOD_EXPANSIONS)
7003 else if (c == '^' || c == ',' || c == '~')
7010 /* Catch the valid and invalid brace expressions that made it through the
7012 /* ${#-} is a valid expansion and means to take the length of $-.
7013 Similarly for ${#?} and ${##}... */
7014 if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 &&
7015 VALID_SPECIAL_LENGTH_PARAM (c) && string[sindex] == RBRACE)
7017 name = (char *)xrealloc (name, 3);
7020 c = string[sindex++];
7023 /* ...but ${#%}, ${#:}, ${#=}, ${#+}, and ${#/} are errors. */
7024 if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 &&
7025 member (c, "%:=+/") && string[sindex] == RBRACE)
7027 temp = (char *)NULL;
7028 goto bad_substitution;
7031 /* Indirect expansion begins with a `!'. A valid indirect expansion is
7032 either a variable name, one of the positional parameters or a special
7033 variable that expands to one of the positional parameters. */
7034 want_indir = *name == '!' &&
7035 (legal_variable_starter ((unsigned char)name[1]) || DIGIT (name[1])
7036 || VALID_INDIR_PARAM (name[1]));
7038 /* Determine the value of this variable. */
7040 /* Check for special variables, directly referenced. */
7041 if (SPECIAL_VAR (name, want_indir))
7044 /* Check for special expansion things, like the length of a parameter */
7045 if (*name == '#' && name[1])
7047 /* If we are not pointing at the character just after the
7048 closing brace, then we haven't gotten all of the name.
7049 Since it begins with a special character, this is a bad
7050 substitution. Also check NAME for validity before trying
7052 if (string[sindex - 1] != RBRACE || (valid_length_expression (name) == 0))
7054 temp = (char *)NULL;
7055 goto bad_substitution;
7058 number = parameter_brace_expand_length (name);
7059 if (number == INTMAX_MIN && unbound_vars_is_error)
7061 last_command_exit_value = EXECUTION_FAILURE;
7062 err_unboundvar (name+1);
7064 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7070 return (&expand_wdesc_error);
7073 ret = alloc_word_desc ();
7074 ret->word = itos (number);
7079 /* ${@} is identical to $@. */
7080 if (name[0] == '@' && name[1] == '\0')
7082 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
7083 *quoted_dollar_atp = 1;
7085 if (contains_dollar_at)
7086 *contains_dollar_at = 1;
7089 /* Process ${!PREFIX*} expansion. */
7090 if (want_indir && string[sindex - 1] == RBRACE &&
7091 (string[sindex - 2] == '*' || string[sindex - 2] == '@') &&
7092 legal_variable_starter ((unsigned char) name[1]))
7097 temp1 = savestring (name + 1);
7098 number = strlen (temp1);
7099 temp1[number - 1] = '\0';
7100 x = all_variables_matching_prefix (temp1);
7101 xlist = strvec_to_word_list (x, 0, 0);
7102 if (string[sindex - 2] == '*')
7103 temp = string_list_dollar_star (xlist);
7106 temp = string_list_dollar_at (xlist, quoted);
7107 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
7108 *quoted_dollar_atp = 1;
7109 if (contains_dollar_at)
7110 *contains_dollar_at = 1;
7113 dispose_words (xlist);
7117 ret = alloc_word_desc ();
7122 #if defined (ARRAY_VARS)
7123 /* Process ${!ARRAY[@]} and ${!ARRAY[*]} expansion. */ /* [ */
7124 if (want_indir && string[sindex - 1] == RBRACE &&
7125 string[sindex - 2] == ']' && valid_array_reference (name+1))
7129 temp1 = savestring (name + 1);
7130 x = array_variable_name (temp1, &x1, (int *)0); /* [ */
7132 if (ALL_ELEMENT_SUB (x1[0]) && x1[1] == ']')
7134 temp = array_keys (temp1, quoted); /* handles assoc vars too */
7137 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
7138 *quoted_dollar_atp = 1;
7139 if (contains_dollar_at)
7140 *contains_dollar_at = 1;
7146 ret = alloc_word_desc ();
7153 #endif /* ARRAY_VARS */
7155 /* Make sure that NAME is valid before trying to go on. */
7156 if (valid_brace_expansion_word (want_indir ? name + 1 : name,
7157 var_is_special) == 0)
7159 temp = (char *)NULL;
7160 goto bad_substitution;
7164 tdesc = parameter_brace_expand_indir (name + 1, var_is_special, quoted, quoted_dollar_atp, contains_dollar_at);
7166 tdesc = parameter_brace_expand_word (name, var_is_special, quoted, PF_IGNUNBOUND|(pflags&PF_NOSPLIT2), &ind);
7171 tflag = tdesc->flags;
7172 dispose_word_desc (tdesc);
7177 #if defined (ARRAY_VARS)
7178 if (valid_array_reference (name))
7179 chk_atstar (name, quoted, quoted_dollar_atp, contains_dollar_at);
7182 var_is_set = temp != (char *)0;
7183 var_is_null = check_nullness && (var_is_set == 0 || *temp == 0);
7185 /* Get the rest of the stuff inside the braces. */
7186 if (c && c != RBRACE)
7188 /* Extract the contents of the ${ ... } expansion
7189 according to the Posix.2 rules. */
7190 value = extract_dollar_brace_string (string, &sindex, quoted, (c == '%' || c == '#' || c =='/' || c == '^' || c == ',' || c ==':') ? SX_POSIXEXP|SX_WORD : SX_WORD);
7191 if (string[sindex] == RBRACE)
7194 goto bad_substitution;
7197 value = (char *)NULL;
7201 /* All the cases where an expansion can possibly generate an unbound
7203 if (want_substring || want_patsub || want_casemod || c == '#' || c == '%' || c == RBRACE)
7205 if (var_is_set == 0 && unbound_vars_is_error && ((name[0] != '@' && name[0] != '*') || name[1]))
7207 last_command_exit_value = EXECUTION_FAILURE;
7208 err_unboundvar (name);
7212 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7216 /* If this is a substring spec, process it and add the result. */
7219 temp1 = parameter_brace_substring (name, temp, ind, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0);
7224 if (temp1 == &expand_param_error)
7225 return (&expand_wdesc_error);
7226 else if (temp1 == &expand_param_fatal)
7227 return (&expand_wdesc_fatal);
7229 ret = alloc_word_desc ();
7231 if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7232 ret->flags |= W_QUOTED|W_HASQUOTEDNULL;
7235 else if (want_patsub)
7237 temp1 = parameter_brace_patsub (name, temp, ind, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0);
7242 if (temp1 == &expand_param_error)
7243 return (&expand_wdesc_error);
7244 else if (temp1 == &expand_param_fatal)
7245 return (&expand_wdesc_fatal);
7247 ret = alloc_word_desc ();
7249 ret = alloc_word_desc ();
7251 if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7252 ret->flags |= W_QUOTED|W_HASQUOTEDNULL;
7255 #if defined (CASEMOD_EXPANSIONS)
7256 else if (want_casemod)
7258 temp1 = parameter_brace_casemod (name, temp, ind, modspec, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0);
7263 if (temp1 == &expand_param_error)
7264 return (&expand_wdesc_error);
7265 else if (temp1 == &expand_param_fatal)
7266 return (&expand_wdesc_fatal);
7268 ret = alloc_word_desc ();
7270 if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7271 ret->flags |= W_QUOTED|W_HASQUOTEDNULL;
7276 /* Do the right thing based on which character ended the variable name. */
7282 last_command_exit_value = EXECUTION_FAILURE;
7283 report_error (_("%s: bad substitution"), string ? string : "??");
7287 return &expand_wdesc_error;
7292 case '#': /* ${param#[#]pattern} */
7293 case '%': /* ${param%[%]pattern} */
7294 if (value == 0 || *value == '\0' || temp == 0 || *temp == '\0')
7299 temp1 = parameter_brace_remove_pattern (name, temp, ind, value, c, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0);
7304 ret = alloc_word_desc ();
7306 if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7307 ret->flags |= W_QUOTED|W_HASQUOTEDNULL;
7314 if (var_is_set && var_is_null == 0)
7316 /* If the operator is `+', we don't want the value of the named
7317 variable for anything, just the value of the right hand side. */
7320 /* XXX -- if we're double-quoted and the named variable is "$@",
7321 we want to turn off any special handling of "$@" --
7322 we're not using it, so whatever is on the rhs applies. */
7323 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
7324 *quoted_dollar_atp = 0;
7325 if (contains_dollar_at)
7326 *contains_dollar_at = 0;
7331 /* From Posix discussion on austin-group list. Issue 221
7332 requires that backslashes escaping `}' inside
7333 double-quoted ${...} be removed. */
7334 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
7335 quoted |= Q_DOLBRACE;
7336 ret = parameter_brace_expand_rhs (name, value, c,
7339 contains_dollar_at);
7340 /* XXX - fix up later, esp. noting presence of
7341 W_HASQUOTEDNULL in ret->flags */
7345 temp = (char *)NULL;
7351 /* Otherwise do nothing; just use the value in TEMP. */
7353 else /* VAR not set or VAR is NULL. */
7356 temp = (char *)NULL;
7357 if (c == '=' && var_is_special)
7359 report_error (_("$%s: cannot assign in this way"), name);
7362 return &expand_wdesc_error;
7366 parameter_brace_expand_error (name, value);
7367 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7371 /* XXX -- if we're double-quoted and the named variable is "$@",
7372 we want to turn off any special handling of "$@" --
7373 we're not using it, so whatever is on the rhs applies. */
7374 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp)
7375 *quoted_dollar_atp = 0;
7376 if (contains_dollar_at)
7377 *contains_dollar_at = 0;
7379 /* From Posix discussion on austin-group list. Issue 221 requires
7380 that backslashes escaping `}' inside double-quoted ${...} be
7382 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
7383 quoted |= Q_DOLBRACE;
7384 ret = parameter_brace_expand_rhs (name, value, c, quoted,
7386 contains_dollar_at);
7387 /* XXX - fix up later, esp. noting presence of
7388 W_HASQUOTEDNULL in tdesc->flags */
7399 ret = alloc_word_desc ();
7406 /* Expand a single ${xxx} expansion. The braces are optional. When
7407 the braces are used, parameter_brace_expand() does the work,
7408 possibly calling param_expand recursively. */
7410 param_expand (string, sindex, quoted, expanded_something,
7411 contains_dollar_at, quoted_dollar_at_p, had_quoted_null_p,
7414 int *sindex, quoted, *expanded_something, *contains_dollar_at;
7415 int *quoted_dollar_at_p, *had_quoted_null_p, pflags;
7417 char *temp, *temp1, uerror[3];
7418 int zindex, t_index, expok;
7423 WORD_DESC *tdesc, *ret;
7427 c = string[++zindex];
7429 temp = (char *)NULL;
7430 ret = tdesc = (WORD_DESC *)NULL;
7433 /* Do simple cases first. Switch on what follows '$'. */
7447 temp1 = dollar_vars[TODIGIT (c)];
7448 if (unbound_vars_is_error && temp1 == (char *)NULL)
7453 last_command_exit_value = EXECUTION_FAILURE;
7454 err_unboundvar (uerror);
7455 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7458 temp = (*temp1 && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7459 ? quote_string (temp1)
7460 : quote_escapes (temp1);
7462 temp = (char *)NULL;
7466 /* $$ -- pid of the invoking shell. */
7468 temp = itos (dollar_dollar_pid);
7471 /* $# -- number of positional parameters. */
7473 temp = itos (number_of_args ());
7476 /* $? -- return value of the last synchronous command. */
7478 temp = itos (last_command_exit_value);
7481 /* $- -- flags supplied to the shell on invocation or by `set'. */
7483 temp = which_set_flags ();
7486 /* $! -- Pid of the last asynchronous command. */
7488 /* If no asynchronous pids have been created, expand to nothing.
7489 If `set -u' has been executed, and no async processes have
7490 been created, this is an expansion error. */
7491 if (last_asynchronous_pid == NO_PID)
7493 if (expanded_something)
7494 *expanded_something = 0;
7495 temp = (char *)NULL;
7496 if (unbound_vars_is_error)
7501 last_command_exit_value = EXECUTION_FAILURE;
7502 err_unboundvar (uerror);
7503 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7507 temp = itos (last_asynchronous_pid);
7510 /* The only difference between this and $@ is when the arg is quoted. */
7511 case '*': /* `$*' */
7512 list = list_rest_of_args ();
7515 /* According to austin-group posix proposal by Geoff Clare in
7516 <20090505091501.GA10097@squonk.masqnet> of 5 May 2009:
7518 "The shell shall write a message to standard error and
7519 immediately exit when it tries to expand an unset parameter
7520 other than the '@' and '*' special parameters."
7523 if (list == 0 && unbound_vars_is_error && (pflags & PF_IGNUNBOUND) == 0)
7528 last_command_exit_value = EXECUTION_FAILURE;
7529 err_unboundvar (uerror);
7530 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7534 /* If there are no command-line arguments, this should just
7535 disappear if there are other characters in the expansion,
7536 even if it's quoted. */
7537 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && list == 0)
7538 temp = (char *)NULL;
7539 else if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES|Q_PATQUOTE))
7541 /* If we have "$*" we want to make a string of the positional
7542 parameters, separated by the first character of $IFS, and
7543 quote the whole string, including the separators. If IFS
7544 is unset, the parameters are separated by ' '; if $IFS is
7545 null, the parameters are concatenated. */
7546 temp = (quoted & (Q_DOUBLE_QUOTES|Q_PATQUOTE)) ? string_list_dollar_star (list) : string_list (list);
7549 temp1 = quote_string (temp);
7551 tflag |= W_HASQUOTEDNULL;
7558 /* We check whether or not we're eventually going to split $* here,
7559 for example when IFS is empty and we are processing the rhs of
7560 an assignment statement. In that case, we don't separate the
7561 arguments at all. Otherwise, if the $* is not quoted it is
7564 # if defined (HANDLE_MULTIBYTE)
7565 if (expand_no_split_dollar_star && ifs_firstc[0] == 0)
7567 if (expand_no_split_dollar_star && ifs_firstc == 0)
7569 temp = string_list_dollar_star (list);
7571 temp = string_list_dollar_at (list, quoted);
7573 temp = string_list_dollar_at (list, quoted);
7575 if (expand_no_split_dollar_star == 0 && contains_dollar_at)
7576 *contains_dollar_at = 1;
7579 dispose_words (list);
7582 /* When we have "$@" what we want is "$1" "$2" "$3" ... This
7583 means that we have to turn quoting off after we split into
7584 the individually quoted arguments so that the final split
7585 on the first character of $IFS is still done. */
7586 case '@': /* `$@' */
7587 list = list_rest_of_args ();
7590 /* According to austin-group posix proposal by Geoff Clare in
7591 <20090505091501.GA10097@squonk.masqnet> of 5 May 2009:
7593 "The shell shall write a message to standard error and
7594 immediately exit when it tries to expand an unset parameter
7595 other than the '@' and '*' special parameters."
7598 if (list == 0 && unbound_vars_is_error && (pflags & PF_IGNUNBOUND) == 0)
7603 last_command_exit_value = EXECUTION_FAILURE;
7604 err_unboundvar (uerror);
7605 return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal);
7609 /* We want to flag the fact that we saw this. We can't turn
7610 off quoting entirely, because other characters in the
7611 string might need it (consider "\"$@\""), but we need some
7612 way to signal that the final split on the first character
7613 of $IFS should be done, even though QUOTED is 1. */
7614 /* XXX - should this test include Q_PATQUOTE? */
7615 if (quoted_dollar_at_p && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7616 *quoted_dollar_at_p = 1;
7617 if (contains_dollar_at)
7618 *contains_dollar_at = 1;
7621 if (pflags & PF_NOSPLIT2)
7622 temp = string_list_internal (quoted ? quote_list (list) : list, " ");
7625 /* We want to separate the positional parameters with the first
7626 character of $IFS in case $IFS is something other than a space.
7627 We also want to make sure that splitting is done no matter what --
7628 according to POSIX.2, this expands to a list of the positional
7629 parameters no matter what IFS is set to. */
7630 temp = string_list_dollar_at (list, quoted);
7632 dispose_words (list);
7636 tdesc = parameter_brace_expand (string, &zindex, quoted, pflags,
7638 contains_dollar_at);
7640 if (tdesc == &expand_wdesc_error || tdesc == &expand_wdesc_fatal)
7642 temp = tdesc ? tdesc->word : (char *)0;
7645 /* Quoted nulls should be removed if there is anything else
7647 /* Note that we saw the quoted null so we can add one back at
7648 the end of this function if there are no other characters
7649 in the string, discard TEMP, and go on. The exception to
7650 this is when we have "${@}" and $1 is '', since $@ needs
7651 special handling. */
7652 if (tdesc && tdesc->word && (tdesc->flags & W_HASQUOTEDNULL) && QUOTED_NULL (temp))
7654 if (had_quoted_null_p)
7655 *had_quoted_null_p = 1;
7656 if (*quoted_dollar_at_p == 0)
7659 tdesc->word = temp = (char *)NULL;
7667 /* Do command or arithmetic substitution. */
7669 /* We have to extract the contents of this paren substitution. */
7670 t_index = zindex + 1;
7671 temp = extract_command_subst (string, &t_index, 0);
7674 /* For Posix.2-style `$(( ))' arithmetic substitution,
7675 extract the expression and pass it to the evaluator. */
7676 if (temp && *temp == LPAREN)
7680 temp2 = savestring (temp1);
7681 t_index = strlen (temp2) - 1;
7683 if (temp2[t_index] != RPAREN)
7689 /* Cut off ending `)' */
7690 temp2[t_index] = '\0';
7692 if (chk_arithsub (temp2, t_index) == 0)
7696 internal_warning (_("future versions of the shell will force evaluation as an arithmetic substitution"));
7701 /* Expand variables found inside the expression. */
7702 temp1 = expand_arith_string (temp2, Q_DOUBLE_QUOTES);
7706 /* No error messages. */
7707 this_command_name = (char *)NULL;
7708 number = evalexp (temp1, &expok);
7713 if (interactive_shell == 0 && posixly_correct)
7715 last_command_exit_value = EXECUTION_FAILURE;
7716 return (&expand_wdesc_fatal);
7719 return (&expand_wdesc_error);
7721 temp = itos (number);
7726 if (pflags & PF_NOCOMSUB)
7727 /* we need zindex+1 because string[zindex] == RPAREN */
7728 temp1 = substring (string, *sindex, zindex+1);
7731 tdesc = command_substitute (temp, quoted);
7732 temp1 = tdesc ? tdesc->word : (char *)NULL;
7734 dispose_word_desc (tdesc);
7740 /* Do POSIX.2d9-style arithmetic substitution. This will probably go
7741 away in a future bash release. */
7743 /* Extract the contents of this arithmetic substitution. */
7744 t_index = zindex + 1;
7745 temp = extract_arithmetic_subst (string, &t_index);
7749 temp = savestring (string);
7750 if (expanded_something)
7751 *expanded_something = 0;
7755 /* Do initial variable expansion. */
7756 temp1 = expand_arith_string (temp, Q_DOUBLE_QUOTES);
7761 /* Find the variable in VARIABLE_LIST. */
7762 temp = (char *)NULL;
7764 for (t_index = zindex; (c = string[zindex]) && legal_variable_char (c); zindex++)
7766 temp1 = (zindex > t_index) ? substring (string, t_index, zindex) : (char *)NULL;
7768 /* If this isn't a variable name, then just output the `$'. */
7769 if (temp1 == 0 || *temp1 == '\0')
7772 temp = (char *)xmalloc (2);
7775 if (expanded_something)
7776 *expanded_something = 0;
7780 /* If the variable exists, return its value cell. */
7781 var = find_variable (temp1);
7783 if (var && invisible_p (var) == 0 && var_isset (var))
7785 #if defined (ARRAY_VARS)
7786 if (assoc_p (var) || array_p (var))
7788 temp = array_p (var) ? array_reference (array_cell (var), 0)
7789 : assoc_reference (assoc_cell (var), "0");
7791 temp = (*temp && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7792 ? quote_string (temp)
7793 : quote_escapes (temp);
7794 else if (unbound_vars_is_error)
7795 goto unbound_variable;
7800 temp = value_cell (var);
7802 temp = (*temp && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)))
7803 ? quote_string (temp)
7804 : quote_escapes (temp);
7812 temp = (char *)NULL;
7815 if (unbound_vars_is_error)
7817 last_command_exit_value = EXECUTION_FAILURE;
7818 err_unboundvar (temp1);
7827 last_command_exit_value = EXECUTION_FAILURE;
7828 return ((unbound_vars_is_error && interactive_shell == 0)
7829 ? &expand_wdesc_fatal
7830 : &expand_wdesc_error);
7841 ret = alloc_word_desc ();
7842 ret->flags = tflag; /* XXX */
7848 /* Make a word list which is the result of parameter and variable
7849 expansion, command substitution, arithmetic substitution, and
7850 quote removal of WORD. Return a pointer to a WORD_LIST which is
7851 the result of the expansion. If WORD contains a null word, the
7852 word list returned is also null.
7854 QUOTED contains flag values defined in shell.h.
7856 ISEXP is used to tell expand_word_internal that the word should be
7857 treated as the result of an expansion. This has implications for
7858 how IFS characters in the word are treated.
7860 CONTAINS_DOLLAR_AT and EXPANDED_SOMETHING are return values; when non-null
7861 they point to an integer value which receives information about expansion.
7862 CONTAINS_DOLLAR_AT gets non-zero if WORD contained "$@", else zero.
7863 EXPANDED_SOMETHING get non-zero if WORD contained any parameter expansions,
7866 This only does word splitting in the case of $@ expansion. In that
7867 case, we split on ' '. */
7869 /* Values for the local variable quoted_state. */
7871 #define PARTIALLY_QUOTED 1
7872 #define WHOLLY_QUOTED 2
7875 expand_word_internal (word, quoted, isexp, contains_dollar_at, expanded_something)
7878 int *contains_dollar_at;
7879 int *expanded_something;
7884 /* The intermediate string that we build while expanding. */
7887 /* The current size of the above object. */
7890 /* Index into ISTRING. */
7893 /* Temporary string storage. */
7896 /* The text of WORD. */
7897 register char *string;
7899 /* The size of STRING. */
7902 /* The index into STRING. */
7905 /* This gets 1 if we see a $@ while quoted. */
7906 int quoted_dollar_at;
7908 /* One of UNQUOTED, PARTIALLY_QUOTED, or WHOLLY_QUOTED, depending on
7909 whether WORD contains no quoting characters, a partially quoted
7910 string (e.g., "xx"ab), or is fully quoted (e.g., "xxab"). */
7914 int had_quoted_null;
7917 int pflags; /* flags passed to param_expand */
7919 int assignoff; /* If assignment, offset of `=' */
7921 register unsigned char c; /* Current character. */
7922 int t_index; /* For calls to string_extract_xxx. */
7928 istring = (char *)xmalloc (istring_size = DEFAULT_INITIAL_ARRAY_SIZE);
7929 istring[istring_index = 0] = '\0';
7930 quoted_dollar_at = had_quoted_null = has_dollar_at = 0;
7931 quoted_state = UNQUOTED;
7933 string = word->word;
7935 goto finished_with_string;
7936 /* Don't need the string length for the SADD... and COPY_ macros unless
7937 multibyte characters are possible. */
7938 string_size = (MB_CUR_MAX > 1) ? strlen (string) : 1;
7940 if (contains_dollar_at)
7941 *contains_dollar_at = 0;
7945 /* Begin the expansion. */
7951 /* Case on toplevel character. */
7955 goto finished_with_string;
7959 #if HANDLE_MULTIBYTE
7960 if (MB_CUR_MAX > 1 && string[sindex])
7962 SADD_MBQCHAR_BODY(temp, string, sindex, string_size);
7967 temp = (char *)xmalloc (3);
7969 temp[1] = c = string[sindex];
7980 istring = sub_append_string (temp, istring, &istring_index, &istring_size);
7986 #if defined (PROCESS_SUBSTITUTION)
7987 /* Process substitution. */
7991 if (string[++sindex] != LPAREN || (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (word->flags & (W_DQUOTE|W_NOPROCSUB)) || posixly_correct)
7993 sindex--; /* add_character: label increments sindex */
7997 t_index = sindex + 1; /* skip past both '<' and LPAREN */
7999 temp1 = extract_process_subst (string, (c == '<') ? "<(" : ">(", &t_index); /*))*/
8002 /* If the process substitution specification is `<()', we want to
8003 open the pipe for writing in the child and produce output; if
8004 it is `>()', we want to open the pipe for reading in the child
8005 and consume input. */
8006 temp = temp1 ? process_substitute (temp1, (c == '>')) : (char *)0;
8010 goto dollar_add_string;
8012 #endif /* PROCESS_SUBSTITUTION */
8015 /* Posix.2 section 3.6.1 says that tildes following `=' in words
8016 which are not assignment statements are not expanded. If the
8017 shell isn't in posix mode, though, we perform tilde expansion
8018 on `likely candidate' unquoted assignment statements (flags
8019 include W_ASSIGNMENT but not W_QUOTED). A likely candidate
8020 contains an unquoted :~ or =~. Something to think about: we
8021 now have a flag that says to perform tilde expansion on arguments
8022 to `assignment builtins' like declare and export that look like
8023 assignment statements. We now do tilde expansion on such words
8024 even in POSIX mode. */
8025 if (word->flags & (W_ASSIGNRHS|W_NOTILDE))
8027 if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c))
8028 goto add_ifs_character;
8032 /* If we're not in posix mode or forcing assignment-statement tilde
8033 expansion, note where the `=' appears in the word and prepare to
8034 do tilde expansion following the first `='. */
8035 if ((word->flags & W_ASSIGNMENT) &&
8036 (posixly_correct == 0 || (word->flags & W_TILDEEXP)) &&
8037 assignoff == -1 && sindex > 0)
8039 if (sindex == assignoff && string[sindex+1] == '~') /* XXX */
8040 word->flags |= W_ITILDE;
8042 else if ((word->flags & W_ASSIGNMENT) &&
8043 (posixly_correct == 0 || (word->flags & W_TILDEEXP)) &&
8044 string[sindex+1] == '~')
8045 word->flags |= W_ITILDE;
8047 if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c))
8048 goto add_ifs_character;
8053 if (word->flags & W_NOTILDE)
8055 if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c))
8056 goto add_ifs_character;
8061 if ((word->flags & (W_ASSIGNMENT|W_ASSIGNRHS|W_TILDEEXP)) &&
8062 string[sindex+1] == '~')
8063 word->flags |= W_ITILDE;
8065 if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c))
8066 goto add_ifs_character;
8071 /* If the word isn't supposed to be tilde expanded, or we're not
8072 at the start of a word or after an unquoted : or = in an
8073 assignment statement, we don't do tilde expansion. */
8074 if ((word->flags & (W_NOTILDE|W_DQUOTE)) ||
8075 (sindex > 0 && ((word->flags & W_ITILDE) == 0)) ||
8076 (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
8078 word->flags &= ~W_ITILDE;
8079 if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c) && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) == 0)
8080 goto add_ifs_character;
8085 if (word->flags & W_ASSIGNRHS)
8087 else if (word->flags & (W_ASSIGNMENT|W_TILDEEXP))
8092 temp = bash_tilde_find_word (string + sindex, tflag, &t_index);
8094 word->flags &= ~W_ITILDE;
8096 if (temp && *temp && t_index > 0)
8098 temp1 = bash_tilde_expand (temp, tflag);
8099 if (temp1 && *temp1 == '~' && STREQ (temp, temp1))
8103 goto add_character; /* tilde expansion failed */
8108 goto add_quoted_string; /* XXX was add_string */
8117 if (expanded_something)
8118 *expanded_something = 1;
8121 pflags = (word->flags & W_NOCOMSUB) ? PF_NOCOMSUB : 0;
8122 if (word->flags & W_NOSPLIT2)
8123 pflags |= PF_NOSPLIT2;
8124 tword = param_expand (string, &sindex, quoted, expanded_something,
8125 &has_dollar_at, "ed_dollar_at,
8126 &had_quoted_null, pflags);
8128 if (tword == &expand_wdesc_error || tword == &expand_wdesc_fatal)
8132 return ((tword == &expand_wdesc_error) ? &expand_word_error
8133 : &expand_word_fatal);
8135 if (contains_dollar_at && has_dollar_at)
8136 *contains_dollar_at = 1;
8138 if (tword && (tword->flags & W_HASQUOTEDNULL))
8139 had_quoted_null = 1;
8142 dispose_word_desc (tword);
8147 case '`': /* Backquoted command substitution. */
8151 temp = string_extract (string, &sindex, "`", SX_REQMATCH);
8152 /* The test of sindex against t_index is to allow bare instances of
8153 ` to pass through, for backwards compatibility. */
8154 if (temp == &extract_string_error || temp == &extract_string_fatal)
8156 if (sindex - 1 == t_index)
8161 report_error (_("bad substitution: no closing \"`\" in %s") , string+t_index);
8164 return ((temp == &extract_string_error) ? &expand_word_error
8165 : &expand_word_fatal);
8168 if (expanded_something)
8169 *expanded_something = 1;
8171 if (word->flags & W_NOCOMSUB)
8172 /* sindex + 1 because string[sindex] == '`' */
8173 temp1 = substring (string, t_index, sindex + 1);
8176 de_backslash (temp);
8177 tword = command_substitute (temp, quoted);
8178 temp1 = tword ? tword->word : (char *)NULL;
8180 dispose_word_desc (tword);
8184 goto dollar_add_string;
8188 if (string[sindex + 1] == '\n')
8194 c = string[++sindex];
8196 if (quoted & Q_HERE_DOCUMENT)
8198 else if (quoted & Q_DOUBLE_QUOTES)
8203 /* From Posix discussion on austin-group list: Backslash escaping
8204 a } in ${...} is removed. Issue 0000221 */
8205 if ((quoted & Q_DOLBRACE) && c == RBRACE)
8207 SCOPY_CHAR_I (twochars, CTLESC, c, string, sindex, string_size);
8209 else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && ((sh_syntaxtab[c] & tflag) == 0))
8211 SCOPY_CHAR_I (twochars, '\\', c, string, sindex, string_size);
8216 sindex--; /* add_character: label increments sindex */
8221 SCOPY_CHAR_I (twochars, CTLESC, c, string, sindex, string_size);
8226 /* BEFORE jumping here, we need to increment sindex if appropriate */
8227 RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size,
8228 DEFAULT_ARRAY_SIZE);
8229 istring[istring_index++] = twochars[0];
8230 istring[istring_index++] = twochars[1];
8231 istring[istring_index] = '\0';
8237 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (word->flags & W_DQUOTE))
8239 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
8244 temp = string_extract_double_quoted (string, &sindex, 0);
8246 /* If the quotes surrounded the entire string, then the
8247 whole word was quoted. */
8248 quoted_state = (t_index == 1 && string[sindex] == '\0')
8254 tword = alloc_word_desc ();
8257 temp = (char *)NULL;
8260 /* Need to get W_HASQUOTEDNULL flag through this function. */
8261 list = expand_word_internal (tword, Q_DOUBLE_QUOTES, 0, &has_dollar_at, (int *)NULL);
8263 if (list == &expand_word_error || list == &expand_word_fatal)
8267 /* expand_word_internal has already freed temp_word->word
8268 for us because of the way it prints error messages. */
8269 tword->word = (char *)NULL;
8270 dispose_word (tword);
8274 dispose_word (tword);
8276 /* "$@" (a double-quoted dollar-at) expands into nothing,
8277 not even a NULL word, when there are no positional
8279 if (list == 0 && has_dollar_at)
8285 /* If we get "$@", we know we have expanded something, so we
8286 need to remember it for the final split on $IFS. This is
8287 a special case; it's the only case where a quoted string
8288 can expand into more than one word. It's going to come back
8289 from the above call to expand_word_internal as a list with
8290 a single word, in which all characters are quoted and
8291 separated by blanks. What we want to do is to turn it back
8292 into a list for the next piece of code. */
8294 dequote_list (list);
8296 if (list && list->word && (list->word->flags & W_HASQUOTEDNULL))
8297 had_quoted_null = 1;
8302 if (contains_dollar_at)
8303 *contains_dollar_at = 1;
8304 if (expanded_something)
8305 *expanded_something = 1;
8310 /* What we have is "". This is a minor optimization. */
8312 list = (WORD_LIST *)NULL;
8315 /* The code above *might* return a list (consider the case of "$@",
8316 where it returns "$1", "$2", etc.). We can't throw away the
8317 rest of the list, and we have to make sure each word gets added
8318 as quoted. We test on tresult->next: if it is non-NULL, we
8319 quote the whole list, save it to a string with string_list, and
8320 add that string. We don't need to quote the results of this
8321 (and it would be wrong, since that would quote the separators
8322 as well), so we go directly to add_string. */
8328 if (quoted_dollar_at && (word->flags & W_NOSPLIT2))
8329 temp = string_list_internal (quote_list (list), " ");
8332 /* Testing quoted_dollar_at makes sure that "$@" is
8333 split correctly when $IFS does not contain a space. */
8334 temp = quoted_dollar_at
8335 ? string_list_dollar_at (list, Q_DOUBLE_QUOTES)
8336 : string_list (quote_list (list));
8337 dispose_words (list);
8342 temp = savestring (list->word->word);
8343 tflag = list->word->flags;
8344 dispose_words (list);
8346 /* If the string is not a quoted null string, we want
8347 to remove any embedded unquoted CTLNUL characters.
8348 We do not want to turn quoted null strings back into
8349 the empty string, though. We do this because we
8350 want to remove any quoted nulls from expansions that
8351 contain other characters. For example, if we have
8352 x"$*"y or "x$*y" and there are no positional parameters,
8353 the $* should expand into nothing. */
8354 /* We use the W_HASQUOTEDNULL flag to differentiate the
8355 cases: a quoted null character as above and when
8356 CTLNUL is contained in the (non-null) expansion
8357 of some variable. We use the had_quoted_null flag to
8358 pass the value through this function to its caller. */
8359 if ((tflag & W_HASQUOTEDNULL) && QUOTED_NULL (temp) == 0)
8360 remove_quoted_nulls (temp); /* XXX */
8364 temp = (char *)NULL;
8366 /* We do not want to add quoted nulls to strings that are only
8367 partially quoted; we can throw them away. */
8368 if (temp == 0 && quoted_state == PARTIALLY_QUOTED && (word->flags & (W_NOSPLIT|W_NOSPLIT2)))
8376 temp = quote_string (temp);
8384 sindex--; /* add_character: label increments sindex */
8392 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (word->flags & W_DQUOTE))
8394 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)))
8399 temp = string_extract_single_quoted (string, &sindex);
8401 /* If the entire STRING was surrounded by single quotes,
8402 then the string is wholly quoted. */
8403 quoted_state = (t_index == 1 && string[sindex] == '\0')
8407 /* If all we had was '', it is a null expansion. */
8411 temp = (char *)NULL;
8414 remove_quoted_escapes (temp); /* ??? */
8416 /* We do not want to add quoted nulls to strings that are only
8417 partially quoted; such nulls are discarded. */
8418 if (temp == 0 && (quoted_state == PARTIALLY_QUOTED))
8421 /* If we have a quoted null expansion, add a quoted NULL to istring. */
8425 sindex--; /* add_character: label increments sindex */
8429 goto add_quoted_string;
8434 /* This is the fix for " $@ " */
8436 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (isexp == 0 && isifs (c)))
8438 if (string[sindex]) /* from old goto dollar_add_string */
8447 #if HANDLE_MULTIBYTE
8453 SADD_MBQCHAR_BODY(temp, string, sindex, string_size);
8458 twochars[0] = CTLESC;
8465 SADD_MBCHAR (temp, string, sindex, string_size);
8468 RESIZE_MALLOCED_BUFFER (istring, istring_index, 1, istring_size,
8469 DEFAULT_ARRAY_SIZE);
8470 istring[istring_index++] = c;
8471 istring[istring_index] = '\0';
8473 /* Next character. */
8478 finished_with_string:
8479 /* OK, we're ready to return. If we have a quoted string, and
8480 quoted_dollar_at is not set, we do no splitting at all; otherwise
8481 we split on ' '. The routines that call this will handle what to
8482 do if nothing has been expanded. */
8484 /* Partially and wholly quoted strings which expand to the empty
8485 string are retained as an empty arguments. Unquoted strings
8486 which expand to the empty string are discarded. The single
8487 exception is the case of expanding "$@" when there are no
8488 positional parameters. In that case, we discard the expansion. */
8490 /* Because of how the code that handles "" and '' in partially
8491 quoted strings works, we need to make ISTRING into a QUOTED_NULL
8492 if we saw quoting characters, but the expansion was empty.
8493 "" and '' are tossed away before we get to this point when
8494 processing partially quoted strings. This makes "" and $xxx""
8495 equivalent when xxx is unset. We also look to see whether we
8496 saw a quoted null from a ${} expansion and add one back if we
8499 /* If we expand to nothing and there were no single or double quotes
8500 in the word, we throw it away. Otherwise, we return a NULL word.
8501 The single exception is for $@ surrounded by double quotes when
8502 there are no positional parameters. In that case, we also throw
8505 if (*istring == '\0')
8507 if (quoted_dollar_at == 0 && (had_quoted_null || quoted_state == PARTIALLY_QUOTED))
8509 istring[0] = CTLNUL;
8511 tword = make_bare_word (istring);
8512 tword->flags |= W_HASQUOTEDNULL; /* XXX */
8513 list = make_word_list (tword, (WORD_LIST *)NULL);
8514 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
8515 tword->flags |= W_QUOTED;
8517 /* According to sh, ksh, and Posix.2, if a word expands into nothing
8518 and a double-quoted "$@" appears anywhere in it, then the entire
8520 else if (quoted_state == UNQUOTED || quoted_dollar_at)
8521 list = (WORD_LIST *)NULL;
8525 tword = make_bare_word (istring);
8526 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
8527 tword->flags |= W_QUOTED;
8528 list = make_word_list (tword, (WORD_LIST *)NULL);
8532 list = (WORD_LIST *)NULL;
8535 else if (word->flags & W_NOSPLIT)
8537 tword = make_bare_word (istring);
8538 if (word->flags & W_ASSIGNMENT)
8539 tword->flags |= W_ASSIGNMENT; /* XXX */
8540 if (word->flags & W_COMPASSIGN)
8541 tword->flags |= W_COMPASSIGN; /* XXX */
8542 if (word->flags & W_NOGLOB)
8543 tword->flags |= W_NOGLOB; /* XXX */
8544 if (word->flags & W_NOEXPAND)
8545 tword->flags |= W_NOEXPAND; /* XXX */
8546 if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
8547 tword->flags |= W_QUOTED;
8548 if (had_quoted_null)
8549 tword->flags |= W_HASQUOTEDNULL;
8550 list = make_word_list (tword, (WORD_LIST *)NULL);
8556 ifs_chars = (quoted_dollar_at || has_dollar_at) ? ifs_value : (char *)NULL;
8558 /* If we have $@, we need to split the results no matter what. If
8559 IFS is unset or NULL, string_list_dollar_at has separated the
8560 positional parameters with a space, so we split on space (we have
8561 set ifs_chars to " \t\n" above if ifs is unset). If IFS is set,
8562 string_list_dollar_at has separated the positional parameters
8563 with the first character of $IFS, so we split on $IFS. */
8564 if (has_dollar_at && ifs_chars)
8565 list = list_string (istring, *ifs_chars ? ifs_chars : " ", 1);
8568 tword = make_bare_word (istring);
8569 if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (quoted_state == WHOLLY_QUOTED))
8570 tword->flags |= W_QUOTED;
8571 if (word->flags & W_ASSIGNMENT)
8572 tword->flags |= W_ASSIGNMENT;
8573 if (word->flags & W_COMPASSIGN)
8574 tword->flags |= W_COMPASSIGN;
8575 if (word->flags & W_NOGLOB)
8576 tword->flags |= W_NOGLOB;
8577 if (word->flags & W_NOEXPAND)
8578 tword->flags |= W_NOEXPAND;
8579 if (had_quoted_null)
8580 tword->flags |= W_HASQUOTEDNULL; /* XXX */
8581 list = make_word_list (tword, (WORD_LIST *)NULL);
8589 /* **************************************************************** */
8591 /* Functions for Quote Removal */
8593 /* **************************************************************** */
8595 /* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the
8596 backslash quoting rules for within double quotes or a here document. */
8598 string_quote_removal (string, quoted)
8603 char *r, *result_string, *temp, *send;
8604 int sindex, tindex, dquote;
8608 /* The result can be no longer than the original string. */
8609 slen = strlen (string);
8610 send = string + slen;
8612 r = result_string = (char *)xmalloc (slen + 1);
8614 for (dquote = sindex = 0; c = string[sindex];)
8619 c = string[++sindex];
8625 if (((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) && (sh_syntaxtab[c] & CBSDQUOTE) == 0)
8630 SCOPY_CHAR_M (r, string, send, sindex);
8634 if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote)
8640 tindex = sindex + 1;
8641 temp = string_extract_single_quoted (string, &tindex);
8652 dquote = 1 - dquote;
8658 return (result_string);
8663 /* Perform quote removal on word WORD. This allocates and returns a new
8666 word_quote_removal (word, quoted)
8673 t = string_quote_removal (word->word, quoted);
8674 w = alloc_word_desc ();
8675 w->word = t ? t : savestring ("");
8679 /* Perform quote removal on all words in LIST. If QUOTED is non-zero,
8680 the members of the list are treated as if they are surrounded by
8681 double quotes. Return a new list, or NULL if LIST is NULL. */
8683 word_list_quote_removal (list, quoted)
8687 WORD_LIST *result, *t, *tresult, *e;
8689 for (t = list, result = (WORD_LIST *)NULL; t; t = t->next)
8691 tresult = make_word_list (word_quote_removal (t->word, quoted), (WORD_LIST *)NULL);
8693 result = (WORD_LIST *) list_append (result, tresult);
8696 result = e = tresult;
8709 /*******************************************
8711 * Functions to perform word splitting *
8713 *******************************************/
8723 ifs_value = (v && value_cell (v)) ? value_cell (v) : " \t\n";
8725 /* Should really merge ifs_cmap with sh_syntaxtab. XXX - doesn't yet
8726 handle multibyte chars in IFS */
8727 memset (ifs_cmap, '\0', sizeof (ifs_cmap));
8728 for (t = ifs_value ; t && *t; t++)
8734 #if defined (HANDLE_MULTIBYTE)
8737 ifs_firstc[0] = '\0';
8743 ifs_len = strnlen (ifs_value, MB_CUR_MAX);
8744 ifs_firstc_len = MBLEN (ifs_value, ifs_len);
8745 if (ifs_firstc_len == 1 || ifs_firstc_len == 0 || MB_INVALIDCH (ifs_firstc_len))
8747 ifs_firstc[0] = ifs_value[0];
8748 ifs_firstc[1] = '\0';
8752 memcpy (ifs_firstc, ifs_value, ifs_firstc_len);
8755 ifs_firstc = ifs_value ? *ifs_value : 0;
8765 /* This splits a single word into a WORD LIST on $IFS, but only if the word
8766 is not quoted. list_string () performs quote removal for us, even if we
8767 don't do any splitting. */
8769 word_split (w, ifs_chars)
8779 xifs = ((w->flags & W_QUOTED) || ifs_chars == 0) ? "" : ifs_chars;
8780 result = list_string (w->word, xifs, w->flags & W_QUOTED);
8783 result = (WORD_LIST *)NULL;
8788 /* Perform word splitting on LIST and return the RESULT. It is possible
8789 to return (WORD_LIST *)NULL. */
8791 word_list_split (list)
8794 WORD_LIST *result, *t, *tresult, *e;
8796 for (t = list, result = (WORD_LIST *)NULL; t; t = t->next)
8798 tresult = word_split (t->word, ifs_value);
8800 result = e = tresult;
8811 /**************************************************
8813 * Functions to expand an entire WORD_LIST *
8815 **************************************************/
8817 /* Do any word-expansion-specific cleanup and jump to top_level */
8819 exp_jump_to_top_level (v)
8822 set_pipestatus_from_exit (last_command_exit_value);
8824 /* Cleanup code goes here. */
8825 expand_no_split_dollar_star = 0; /* XXX */
8826 expanding_redir = 0;
8827 assigning_in_environment = 0;
8829 if (parse_and_execute_level == 0)
8830 top_level_cleanup (); /* from sig.c */
8832 jump_to_top_level (v);
8835 /* Put NLIST (which is a WORD_LIST * of only one element) at the front of
8836 ELIST, and set ELIST to the new list. */
8837 #define PREPEND_LIST(nlist, elist) \
8838 do { nlist->next = elist; elist = nlist; } while (0)
8840 /* Separate out any initial variable assignments from TLIST. If set -k has
8841 been executed, remove all assignment statements from TLIST. Initial
8842 variable assignments and other environment assignments are placed
8843 on SUBST_ASSIGN_VARLIST. */
8845 separate_out_assignments (tlist)
8848 register WORD_LIST *vp, *lp;
8851 return ((WORD_LIST *)NULL);
8853 if (subst_assign_varlist)
8854 dispose_words (subst_assign_varlist); /* Clean up after previous error */
8856 subst_assign_varlist = (WORD_LIST *)NULL;
8859 /* Separate out variable assignments at the start of the command.
8860 Loop invariant: vp->next == lp
8862 lp = list of words left after assignment statements skipped
8863 tlist = original list of words
8865 while (lp && (lp->word->flags & W_ASSIGNMENT))
8871 /* If lp != tlist, we have some initial assignment statements.
8872 We make SUBST_ASSIGN_VARLIST point to the list of assignment
8873 words and TLIST point to the remaining words. */
8876 subst_assign_varlist = tlist;
8877 /* ASSERT(vp->next == lp); */
8878 vp->next = (WORD_LIST *)NULL; /* terminate variable list */
8879 tlist = lp; /* remainder of word list */
8882 /* vp == end of variable list */
8883 /* tlist == remainder of original word list without variable assignments */
8885 /* All the words in tlist were assignment statements */
8886 return ((WORD_LIST *)NULL);
8888 /* ASSERT(tlist != NULL); */
8889 /* ASSERT((tlist->word->flags & W_ASSIGNMENT) == 0); */
8891 /* If the -k option is in effect, we need to go through the remaining
8892 words, separate out the assignment words, and place them on
8893 SUBST_ASSIGN_VARLIST. */
8894 if (place_keywords_in_env)
8896 WORD_LIST *tp; /* tp == running pointer into tlist */
8901 /* Loop Invariant: tp->next == lp */
8902 /* Loop postcondition: tlist == word list without assignment statements */
8905 if (lp->word->flags & W_ASSIGNMENT)
8907 /* Found an assignment statement, add this word to end of
8908 subst_assign_varlist (vp). */
8909 if (!subst_assign_varlist)
8910 subst_assign_varlist = vp = lp;
8917 /* Remove the word pointed to by LP from TLIST. */
8918 tp->next = lp->next;
8919 /* ASSERT(vp == lp); */
8920 lp->next = (WORD_LIST *)NULL;
8933 #define WEXP_VARASSIGN 0x001
8934 #define WEXP_BRACEEXP 0x002
8935 #define WEXP_TILDEEXP 0x004
8936 #define WEXP_PARAMEXP 0x008
8937 #define WEXP_PATHEXP 0x010
8939 /* All of the expansions, including variable assignments at the start of
8941 #define WEXP_ALL (WEXP_VARASSIGN|WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP)
8943 /* All of the expansions except variable assignments at the start of
8945 #define WEXP_NOVARS (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP)
8947 /* All of the `shell expansions': brace expansion, tilde expansion, parameter
8948 expansion, command substitution, arithmetic expansion, word splitting, and
8950 #define WEXP_SHELLEXP (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP)
8952 /* Take the list of words in LIST and do the various substitutions. Return
8953 a new list of words which is the expanded list, and without things like
8954 variable assignments. */
8960 return (expand_word_list_internal (list, WEXP_ALL));
8963 /* Same as expand_words (), but doesn't hack variable or environment
8966 expand_words_no_vars (list)
8969 return (expand_word_list_internal (list, WEXP_NOVARS));
8973 expand_words_shellexp (list)
8976 return (expand_word_list_internal (list, WEXP_SHELLEXP));
8980 glob_expand_word_list (tlist, eflags)
8984 char **glob_array, *temp_string;
8985 register int glob_index;
8986 WORD_LIST *glob_list, *output_list, *disposables, *next;
8989 output_list = disposables = (WORD_LIST *)NULL;
8990 glob_array = (char **)NULL;
8993 /* For each word, either globbing is attempted or the word is
8994 added to orig_list. If globbing succeeds, the results are
8995 added to orig_list and the word (tlist) is added to the list
8996 of disposable words. If globbing fails and failed glob
8997 expansions are left unchanged (the shell default), the
8998 original word is added to orig_list. If globbing fails and
8999 failed glob expansions are removed, the original word is
9000 added to the list of disposable words. orig_list ends up
9001 in reverse order and requires a call to REVERSE_LIST to
9002 be set right. After all words are examined, the disposable
9006 /* If the word isn't an assignment and contains an unquoted
9007 pattern matching character, then glob it. */
9008 if ((tlist->word->flags & W_NOGLOB) == 0 &&
9009 unquoted_glob_pattern_p (tlist->word->word))
9011 glob_array = shell_glob_filename (tlist->word->word);
9013 /* Handle error cases.
9014 I don't think we should report errors like "No such file
9015 or directory". However, I would like to report errors
9016 like "Read failed". */
9018 if (glob_array == 0 || GLOB_FAILED (glob_array))
9020 glob_array = (char **)xmalloc (sizeof (char *));
9021 glob_array[0] = (char *)NULL;
9024 /* Dequote the current word in case we have to use it. */
9025 if (glob_array[0] == NULL)
9027 temp_string = dequote_string (tlist->word->word);
9028 free (tlist->word->word);
9029 tlist->word->word = temp_string;
9032 /* Make the array into a word list. */
9033 glob_list = (WORD_LIST *)NULL;
9034 for (glob_index = 0; glob_array[glob_index]; glob_index++)
9036 tword = make_bare_word (glob_array[glob_index]);
9037 tword->flags |= W_GLOBEXP; /* XXX */
9038 glob_list = make_word_list (tword, glob_list);
9043 output_list = (WORD_LIST *)list_append (glob_list, output_list);
9044 PREPEND_LIST (tlist, disposables);
9046 else if (fail_glob_expansion != 0)
9048 report_error (_("no match: %s"), tlist->word->word);
9049 exp_jump_to_top_level (DISCARD);
9051 else if (allow_null_glob_expansion == 0)
9053 /* Failed glob expressions are left unchanged. */
9054 PREPEND_LIST (tlist, output_list);
9058 /* Failed glob expressions are removed. */
9059 PREPEND_LIST (tlist, disposables);
9064 /* Dequote the string. */
9065 temp_string = dequote_string (tlist->word->word);
9066 free (tlist->word->word);
9067 tlist->word->word = temp_string;
9068 PREPEND_LIST (tlist, output_list);
9071 strvec_dispose (glob_array);
9072 glob_array = (char **)NULL;
9078 dispose_words (disposables);
9081 output_list = REVERSE_LIST (output_list, WORD_LIST *);
9083 return (output_list);
9086 #if defined (BRACE_EXPANSION)
9088 brace_expand_word_list (tlist, eflags)
9092 register char **expansions;
9094 WORD_LIST *disposables, *output_list, *next;
9098 for (disposables = output_list = (WORD_LIST *)NULL; tlist; tlist = next)
9102 if ((tlist->word->flags & (W_COMPASSIGN|W_ASSIGNARG)) == (W_COMPASSIGN|W_ASSIGNARG))
9104 /*itrace("brace_expand_word_list: %s: W_COMPASSIGN|W_ASSIGNARG", tlist->word->word);*/
9105 PREPEND_LIST (tlist, output_list);
9109 /* Only do brace expansion if the word has a brace character. If
9110 not, just add the word list element to BRACES and continue. In
9111 the common case, at least when running shell scripts, this will
9112 degenerate to a bunch of calls to `mbschr', and then what is
9113 basically a reversal of TLIST into BRACES, which is corrected
9114 by a call to REVERSE_LIST () on BRACES when the end of TLIST
9116 if (mbschr (tlist->word->word, LBRACE))
9118 expansions = brace_expand (tlist->word->word);
9120 for (eindex = 0; temp_string = expansions[eindex]; eindex++)
9122 w = make_word (temp_string);
9123 /* If brace expansion didn't change the word, preserve
9124 the flags. We may want to preserve the flags
9125 unconditionally someday -- XXX */
9126 if (STREQ (temp_string, tlist->word->word))
9127 w->flags = tlist->word->flags;
9128 output_list = make_word_list (w, output_list);
9129 free (expansions[eindex]);
9133 /* Add TLIST to the list of words to be freed after brace
9134 expansion has been performed. */
9135 PREPEND_LIST (tlist, disposables);
9138 PREPEND_LIST (tlist, output_list);
9142 dispose_words (disposables);
9145 output_list = REVERSE_LIST (output_list, WORD_LIST *);
9147 return (output_list);
9151 #if defined (ARRAY_VARS)
9152 /* Take WORD, a compound associative array assignment, and internally run
9153 'declare -A w', where W is the variable name portion of WORD. */
9155 make_internal_declare (word, option)
9163 w = make_word (word);
9165 t = assignment (w->word, 0);
9168 wl = make_word_list (w, (WORD_LIST *)NULL);
9169 wl = make_word_list (make_word (option), wl);
9171 return (declare_builtin (wl));
9176 shell_expand_word_list (tlist, eflags)
9180 WORD_LIST *expanded, *orig_list, *new_list, *next, *temp_list;
9181 int expanded_something, has_dollar_at;
9184 /* We do tilde expansion all the time. This is what 1003.2 says. */
9185 new_list = (WORD_LIST *)NULL;
9186 for (orig_list = tlist; tlist; tlist = next)
9188 temp_string = tlist->word->word;
9192 #if defined (ARRAY_VARS)
9193 /* If this is a compound array assignment to a builtin that accepts
9194 such assignments (e.g., `declare'), take the assignment and perform
9195 it separately, handling the semantics of declarations inside shell
9196 functions. This avoids the double-evaluation of such arguments,
9197 because `declare' does some evaluation of compound assignments on
9199 if ((tlist->word->flags & (W_COMPASSIGN|W_ASSIGNARG)) == (W_COMPASSIGN|W_ASSIGNARG))
9203 if (tlist->word->flags & W_ASSIGNASSOC)
9204 make_internal_declare (tlist->word->word, "-A");
9206 t = do_word_assignment (tlist->word, 0);
9209 last_command_exit_value = EXECUTION_FAILURE;
9210 exp_jump_to_top_level (DISCARD);
9213 /* Now transform the word as ksh93 appears to do and go on */
9214 t = assignment (tlist->word->word, 0);
9215 tlist->word->word[t] = '\0';
9216 tlist->word->flags &= ~(W_ASSIGNMENT|W_NOSPLIT|W_COMPASSIGN|W_ASSIGNARG|W_ASSIGNASSOC);
9220 expanded_something = 0;
9221 expanded = expand_word_internal
9222 (tlist->word, 0, 0, &has_dollar_at, &expanded_something);
9224 if (expanded == &expand_word_error || expanded == &expand_word_fatal)
9226 /* By convention, each time this error is returned,
9227 tlist->word->word has already been freed. */
9228 tlist->word->word = (char *)NULL;
9230 /* Dispose our copy of the original list. */
9231 dispose_words (orig_list);
9232 /* Dispose the new list we're building. */
9233 dispose_words (new_list);
9235 last_command_exit_value = EXECUTION_FAILURE;
9236 if (expanded == &expand_word_error)
9237 exp_jump_to_top_level (DISCARD);
9239 exp_jump_to_top_level (FORCE_EOF);
9242 /* Don't split words marked W_NOSPLIT. */
9243 if (expanded_something && (tlist->word->flags & W_NOSPLIT) == 0)
9245 temp_list = word_list_split (expanded);
9246 dispose_words (expanded);
9250 /* If no parameter expansion, command substitution, process
9251 substitution, or arithmetic substitution took place, then
9252 do not do word splitting. We still have to remove quoted
9253 null characters from the result. */
9254 word_list_remove_quoted_nulls (expanded);
9255 temp_list = expanded;
9258 expanded = REVERSE_LIST (temp_list, WORD_LIST *);
9259 new_list = (WORD_LIST *)list_append (expanded, new_list);
9263 dispose_words (orig_list);
9266 new_list = REVERSE_LIST (new_list, WORD_LIST *);
9271 /* The workhorse for expand_words () and expand_words_no_vars ().
9272 First arg is LIST, a WORD_LIST of words.
9273 Second arg EFLAGS is a flags word controlling which expansions are
9276 This does all of the substitutions: brace expansion, tilde expansion,
9277 parameter expansion, command substitution, arithmetic expansion,
9278 process substitution, word splitting, and pathname expansion, according
9279 to the bits set in EFLAGS. Words with the W_QUOTED or W_NOSPLIT bits
9280 set, or for which no expansion is done, do not undergo word splitting.
9281 Words with the W_NOGLOB bit set do not undergo pathname expansion. */
9283 expand_word_list_internal (list, eflags)
9287 WORD_LIST *new_list, *temp_list;
9291 return ((WORD_LIST *)NULL);
9293 garglist = new_list = copy_word_list (list);
9294 if (eflags & WEXP_VARASSIGN)
9296 garglist = new_list = separate_out_assignments (new_list);
9299 if (subst_assign_varlist)
9301 /* All the words were variable assignments, so they are placed
9302 into the shell's environment. */
9303 for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next)
9305 this_command_name = (char *)NULL; /* no arithmetic errors */
9306 tint = do_word_assignment (temp_list->word, 0);
9307 /* Variable assignment errors in non-interactive shells
9308 running in Posix.2 mode cause the shell to exit. */
9311 last_command_exit_value = EXECUTION_FAILURE;
9312 if (interactive_shell == 0 && posixly_correct)
9313 exp_jump_to_top_level (FORCE_EOF);
9315 exp_jump_to_top_level (DISCARD);
9318 dispose_words (subst_assign_varlist);
9319 subst_assign_varlist = (WORD_LIST *)NULL;
9321 return ((WORD_LIST *)NULL);
9325 /* Begin expanding the words that remain. The expansions take place on
9326 things that aren't really variable assignments. */
9328 #if defined (BRACE_EXPANSION)
9329 /* Do brace expansion on this word if there are any brace characters
9331 if ((eflags & WEXP_BRACEEXP) && brace_expansion && new_list)
9332 new_list = brace_expand_word_list (new_list, eflags);
9333 #endif /* BRACE_EXPANSION */
9335 /* Perform the `normal' shell expansions: tilde expansion, parameter and
9336 variable substitution, command substitution, arithmetic expansion,
9337 and word splitting. */
9338 new_list = shell_expand_word_list (new_list, eflags);
9340 /* Okay, we're almost done. Now let's just do some filename
9344 if ((eflags & WEXP_PATHEXP) && disallow_filename_globbing == 0)
9345 /* Glob expand the word list unless globbing has been disabled. */
9346 new_list = glob_expand_word_list (new_list, eflags);
9348 /* Dequote the words, because we're not performing globbing. */
9349 new_list = dequote_list (new_list);
9352 if ((eflags & WEXP_VARASSIGN) && subst_assign_varlist)
9354 sh_wassign_func_t *assign_func;
9355 int is_special_builtin, is_builtin_or_func;
9357 /* If the remainder of the words expand to nothing, Posix.2 requires
9358 that the variable and environment assignments affect the shell's
9360 assign_func = new_list ? assign_in_env : do_word_assignment;
9361 tempenv_assign_error = 0;
9363 is_builtin_or_func = (new_list && new_list->word && (find_shell_builtin (new_list->word->word) || find_function (new_list->word->word)));
9364 /* Posix says that special builtins exit if a variable assignment error
9365 occurs in an assignment preceding it. */
9366 is_special_builtin = (posixly_correct && new_list && new_list->word && find_special_builtin (new_list->word->word));
9368 for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next)
9370 this_command_name = (char *)NULL;
9371 assigning_in_environment = (assign_func == assign_in_env);
9372 tint = (*assign_func) (temp_list->word, is_builtin_or_func);
9373 assigning_in_environment = 0;
9374 /* Variable assignment errors in non-interactive shells running
9375 in Posix.2 mode cause the shell to exit. */
9378 if (assign_func == do_word_assignment)
9380 last_command_exit_value = EXECUTION_FAILURE;
9381 if (interactive_shell == 0 && posixly_correct && is_special_builtin)
9382 exp_jump_to_top_level (FORCE_EOF);
9384 exp_jump_to_top_level (DISCARD);
9387 tempenv_assign_error++;
9391 dispose_words (subst_assign_varlist);
9392 subst_assign_varlist = (WORD_LIST *)NULL;
9396 tint = list_length (new_list) + 1;
9397 RESIZE_MALLOCED_BUFFER (glob_argv_flags, 0, tint, glob_argv_flags_size, 16);
9398 for (tint = 0, temp_list = new_list; temp_list; temp_list = temp_list->next)
9399 glob_argv_flags[tint++] = (temp_list->word->flags & W_GLOBEXP) ? '1' : '0';
9400 glob_argv_flags[tint] = '\0';