1 /* POSIX.2 wordexp implementation.
2 Copyright (C) 1997-2003,2005,2006,2008,2011 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
33 #include <sys/param.h>
36 #include <sys/types.h>
37 #include <sys/types.h>
42 #include <kernel-features.h>
44 #include <bits/libc-lock.h>
47 /* Undefine the following line for the production version. */
48 /* #define NDEBUG 1 */
51 /* Get some device information. */
52 #include <device-nrs.h>
55 * This is a recursive-descent-style word expansion routine.
58 /* These variables are defined and initialized in the startup code. */
59 extern int __libc_argc attribute_hidden;
60 extern char **__libc_argv attribute_hidden;
62 /* Some forward declarations */
63 static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
64 const char *words, size_t *offset, int flags,
65 wordexp_t *pwordexp, const char *ifs,
66 const char *ifs_white, int quoted)
68 static int parse_backtick (char **word, size_t *word_length,
69 size_t *max_length, const char *words,
70 size_t *offset, int flags, wordexp_t *pwordexp,
71 const char *ifs, const char *ifs_white)
73 static int parse_dquote (char **word, size_t *word_length, size_t *max_length,
74 const char *words, size_t *offset, int flags,
75 wordexp_t *pwordexp, const char *ifs,
76 const char *ifs_white)
78 static int eval_expr (char *expr, long int *result) internal_function;
80 /* The w_*() functions manipulate word lists. */
84 /* Result of w_newword will be ignored if it's the last word. */
86 w_newword (size_t *actlen, size_t *maxlen)
88 *actlen = *maxlen = 0;
93 w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
94 /* (lengths exclude trailing zero) */
96 /* Add a character to the buffer, allocating room for it if needed. */
98 if (*actlen == *maxlen)
100 char *old_buffer = buffer;
101 assert (buffer == NULL || *maxlen != 0);
103 buffer = (char *) realloc (buffer, 1 + *maxlen);
111 buffer[*actlen] = ch;
112 buffer[++(*actlen)] = '\0';
120 w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
123 /* Add a string to the buffer, allocating room for it if needed.
125 if (*actlen + len > *maxlen)
127 char *old_buffer = buffer;
128 assert (buffer == NULL || *maxlen != 0);
129 *maxlen += MAX (2 * len, W_CHUNK);
130 buffer = realloc (old_buffer, 1 + *maxlen);
138 *((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0';
147 w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
148 /* (lengths exclude trailing zero) */
150 /* Add a string to the buffer, allocating room for it if needed.
154 assert (str != NULL); /* w_addstr only called from this file */
157 return w_addmem (buffer, actlen, maxlen, str, len);
162 w_addword (wordexp_t *pwordexp, char *word)
164 /* Add a word to the wordlist */
167 bool allocated = false;
169 /* Internally, NULL acts like "". Convert NULLs to "" before
170 * the caller sees them.
174 word = __strdup ("");
180 num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
181 new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
182 if (new_wordv != NULL)
184 pwordexp->we_wordv = new_wordv;
185 pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
186 pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
197 /* The parse_*() functions should leave *offset being the offset in 'words'
198 * to the last character processed.
203 parse_backslash (char **word, size_t *word_length, size_t *max_length,
204 const char *words, size_t *offset)
206 /* We are poised _at_ a backslash, not in quotes */
208 switch (words[1 + *offset])
211 /* Backslash is last character of input words */
219 *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
232 parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
233 const char *words, size_t *offset)
235 /* We are poised _at_ a backslash, inside quotes */
237 switch (words[1 + *offset])
240 /* Backslash is last character of input words */
251 *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
259 *word = w_addchar (*word, word_length, max_length, words[*offset]);
261 *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
275 parse_tilde (char **word, size_t *word_length, size_t *max_length,
276 const char *words, size_t *offset, size_t wordc)
278 /* We are poised _at_ a tilde */
281 if (*word_length != 0)
283 if (!((*word)[*word_length - 1] == '=' && wordc == 0))
285 if (!((*word)[*word_length - 1] == ':'
286 && strchr (*word, '=') && wordc == 0))
288 *word = w_addchar (*word, word_length, max_length, '~');
289 return *word ? 0 : WRDE_NOSPACE;
294 for (i = 1 + *offset; words[i]; i++)
296 if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
297 words[i] == '\t' || words[i] == 0 )
300 if (words[i] == '\\')
302 *word = w_addchar (*word, word_length, max_length, '~');
303 return *word ? 0 : WRDE_NOSPACE;
307 if (i == 1 + *offset)
309 /* Tilde appears on its own */
311 struct passwd pwd, *tpwd;
317 /* POSIX.2 says ~ expands to $HOME and if HOME is unset the
318 results are unspecified. We do a lookup on the uid if
321 home = getenv ("HOME");
324 *word = w_addstr (*word, word_length, max_length, home);
331 buffer = __alloca (buflen);
333 while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
335 buffer = extend_alloca (buffer, buflen, buflen + 1000);
337 if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
339 *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
345 *word = w_addchar (*word, word_length, max_length, '~');
353 /* Look up user name in database to get home directory */
354 char *user = strndupa (&words[1 + *offset], i - (1 + *offset));
355 struct passwd pwd, *tpwd;
357 char* buffer = __alloca (buflen);
360 while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
362 buffer = extend_alloca (buffer, buflen, buflen + 1000);
364 if (result == 0 && tpwd != NULL && pwd.pw_dir)
365 *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
368 /* (invalid login name) */
369 *word = w_addchar (*word, word_length, max_length, '~');
371 *word = w_addstr (*word, word_length, max_length, user);
376 return *word ? 0 : WRDE_NOSPACE;
382 do_parse_glob (const char *glob_word, char **word, size_t *word_length,
383 size_t *max_length, wordexp_t *pwordexp, const char *ifs,
384 const char *ifs_white)
390 error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);
394 /* We can only run into memory problems. */
395 assert (error == GLOB_NOSPACE);
401 /* No field splitting allowed. */
402 assert (globbuf.gl_pathv[0] != NULL);
403 *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
404 for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
406 *word = w_addchar (*word, word_length, max_length, ' ');
408 *word = w_addstr (*word, word_length, max_length,
409 globbuf.gl_pathv[match]);
413 return *word ? 0 : WRDE_NOSPACE;
416 assert (ifs == NULL || *ifs != '\0');
420 *word = w_newword (word_length, max_length);
423 for (match = 0; match < globbuf.gl_pathc; ++match)
425 char *matching_word = __strdup (globbuf.gl_pathv[match]);
426 if (matching_word == NULL || w_addword (pwordexp, matching_word))
439 parse_glob (char **word, size_t *word_length, size_t *max_length,
440 const char *words, size_t *offset, int flags,
441 wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
443 /* We are poised just after a '*', a '[' or a '?'. */
444 int error = WRDE_NOSPACE;
445 int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
447 wordexp_t glob_list; /* List of words to glob */
449 glob_list.we_wordc = 0;
450 glob_list.we_wordv = NULL;
451 glob_list.we_offs = 0;
452 for (; words[*offset] != '\0'; ++*offset)
454 if (strchr (ifs, words[*offset]) != NULL)
458 /* Sort out quoting */
459 if (words[*offset] == '\'')
466 else if (quoted == 1)
472 else if (words[*offset] == '"')
479 else if (quoted == 2)
486 /* Sort out other special characters */
487 if (quoted != 1 && words[*offset] == '$')
489 error = parse_dollars (word, word_length, max_length, words,
490 offset, flags, &glob_list, ifs, ifs_white,
497 else if (words[*offset] == '\\')
500 error = parse_qtd_backslash (word, word_length, max_length,
503 error = parse_backslash (word, word_length, max_length,
512 *word = w_addchar (*word, word_length, max_length, words[*offset]);
517 /* Don't forget to re-parse the character we stopped at. */
521 error = w_addword (&glob_list, *word);
522 *word = w_newword (word_length, max_length);
523 for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
524 error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
525 max_length, pwordexp, ifs, ifs_white);
529 wordfree (&glob_list);
535 parse_squote (char **word, size_t *word_length, size_t *max_length,
536 const char *words, size_t *offset)
538 /* We are poised just after a single quote */
539 for (; words[*offset]; ++(*offset))
541 if (words[*offset] != '\'')
543 *word = w_addchar (*word, word_length, max_length, words[*offset]);
550 /* Unterminated string */
554 /* Functions to evaluate an arithmetic expression */
557 eval_expr_val (char **expr, long int *result)
561 /* Skip white space */
562 for (digit = *expr; digit && *digit && isspace (*digit); ++digit);
566 /* Scan for closing paren */
567 for (++digit; **expr && **expr != ')'; ++(*expr));
575 if (eval_expr (digit, result))
581 /* POSIX requires that decimal, octal, and hexadecimal constants are
582 recognized. Therefore we pass 0 as the third parameter to strtol. */
583 *result = strtol (digit, expr, 0);
592 eval_expr_multdiv (char **expr, long int *result)
597 if (eval_expr_val (expr, result) != 0)
602 /* Skip white space */
603 for (; *expr && **expr && isspace (**expr); ++(*expr));
608 if (eval_expr_val (expr, &arg) != 0)
613 else if (**expr == '/')
616 if (eval_expr_val (expr, &arg) != 0)
629 eval_expr (char *expr, long int *result)
634 if (eval_expr_multdiv (&expr, result) != 0)
639 /* Skip white space */
640 for (; expr && *expr && isspace (*expr); ++expr);
645 if (eval_expr_multdiv (&expr, &arg) != 0)
650 else if (*expr == '-')
653 if (eval_expr_multdiv (&expr, &arg) != 0)
666 parse_arith (char **word, size_t *word_length, size_t *max_length,
667 const char *words, size_t *offset, int flags, int bracket)
669 /* We are poised just after "$((" or "$[" */
676 expr = w_newword (&expr_length, &expr_maxlen);
677 for (; words[*offset]; ++(*offset))
679 switch (words[*offset])
682 error = parse_dollars (&expr, &expr_length, &expr_maxlen,
683 words, offset, flags, NULL, NULL, NULL, 1);
684 /* The ``1'' here is to tell parse_dollars not to
696 error = parse_backtick (&expr, &expr_length, &expr_maxlen,
697 words, offset, flags, NULL, NULL, NULL);
698 /* The first NULL here is to tell parse_backtick not to
709 error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
716 /* I think that a backslash within an
717 * arithmetic expansion is bound to
718 * cause an error sooner or later anyway though.
723 if (--paren_depth == 0)
725 char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
726 long int numresult = 0;
727 long long int convertme;
729 if (bracket || words[1 + *offset] != ')')
738 if (*expr && eval_expr (expr, &numresult) != 0)
746 convertme = -numresult;
747 *word = w_addchar (*word, word_length, max_length, '-');
755 convertme = numresult;
758 *word = w_addstr (*word, word_length, max_length,
759 _itoa (convertme, &result[20], 10, 0));
761 return *word ? 0 : WRDE_NOSPACE;
763 expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
770 if (bracket && paren_depth == 1)
772 char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
773 long int numresult = 0;
776 if (*expr && eval_expr (expr, &numresult) != 0)
783 *word = w_addstr (*word, word_length, max_length,
784 _itoa_word (numresult, &result[20], 10, 0));
786 return *word ? 0 : WRDE_NOSPACE;
802 expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
813 /* Function called by child process in exec_comm() */
815 internal_function __attribute__ ((always_inline))
816 exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
818 const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
820 /* Execute the command, or just check syntax? */
824 /* Redirect output. */
825 if (__builtin_expect (fildes[1] != STDOUT_FILENO, 1))
827 __dup2 (fildes[1], STDOUT_FILENO);
833 /* Reset the close-on-exec flag (if necessary). */
834 # ifndef __ASSUME_PIPE2
835 if (__have_pipe2 > 0)
837 __fcntl (fildes[1], F_SETFD, 0);
841 /* Redirect stderr to /dev/null if we have to. */
846 __close (STDERR_FILENO);
847 fd = __open (_PATH_DEVNULL, O_WRONLY);
848 if (fd >= 0 && fd != STDERR_FILENO)
850 __dup2 (fd, STDERR_FILENO);
853 /* Be paranoid. Check that we actually opened the /dev/null
855 if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0
856 || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
857 #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
858 || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
861 /* It's not the /dev/null device. Stop right here. The
862 problem is: how do we stop? We use _exit() with an
863 hopefully unusual exit code. */
867 /* Make sure the subshell doesn't field-split on our behalf. */
871 __execve (_PATH_BSHELL, (char *const *) args, __environ);
877 /* Function to execute a command and retrieve the results */
878 /* pwordexp contains NULL if field-splitting is forbidden */
881 exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
882 int flags, wordexp_t *pwordexp, const char *ifs,
883 const char *ifs_white)
890 size_t maxnewlines = 0;
891 char buffer[bufsize];
895 /* Don't fork() unless necessary */
900 # ifndef __ASSUME_PIPE2
901 if (__have_pipe2 >= 0)
904 int r = __pipe2 (fildes, O_CLOEXEC);
905 # ifndef __ASSUME_PIPE2
906 if (__have_pipe2 == 0)
907 __have_pipe2 = r != -1 || errno != ENOSYS ? 1 : -1;
909 if (__have_pipe2 > 0)
916 #ifndef __ASSUME_PIPE2
918 if (__have_pipe2 < 0)
920 if (__pipe (fildes) < 0)
926 if ((pid = __fork ()) < 0)
935 exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec);
939 /* If we are just testing the syntax, only wait. */
941 return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid
942 && status != 0) ? WRDE_SYNTAX : 0;
948 /* Quoted - no field splitting */
952 if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
955 if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0)
957 if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
962 maxnewlines += buflen;
964 *word = w_addmem (*word, word_length, max_length, buffer, buflen);
970 /* Not quoted - split fields */
974 * 0 when searching for first character in a field not IFS white space
975 * 1 when copying the text of a field
976 * 2 when searching for possible non-whitespace IFS
977 * 3 when searching for non-newline after copying field
982 if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
985 if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0)
987 if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
992 for (i = 0; i < buflen; ++i)
994 if (strchr (ifs, buffer[i]) != NULL)
996 /* Current character is IFS */
997 if (strchr (ifs_white, buffer[i]) == NULL)
999 /* Current character is IFS but not whitespace */
1002 /* current character
1005 * eg: text<space><comma><space>moretext
1007 * So, strip whitespace IFS (like at the start)
1014 /* fall through and delimit field.. */
1018 if (buffer[i] == '\n')
1020 /* Current character is (IFS) newline */
1022 /* If copying a field, this is the end of it,
1023 but maybe all that's left is trailing newlines.
1024 So start searching for a non-newline. */
1032 /* Current character is IFS white space, but
1035 /* If not either copying a field or searching
1036 for non-newline after a field, ignore it */
1037 if (copying != 1 && copying != 3)
1040 /* End of field (search for non-ws IFS afterwards) */
1045 /* First IFS white space (non-newline), or IFS non-whitespace.
1046 * Delimit the field. Nulls are converted by w_addword. */
1047 if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
1050 *word = w_newword (word_length, max_length);
1053 /* fall back round the loop.. */
1057 /* Not IFS character */
1061 /* Nothing but (IFS) newlines since the last field,
1062 so delimit it here before starting new word */
1063 if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
1066 *word = w_newword (word_length, max_length);
1071 if (buffer[i] == '\n') /* happens if newline not in IFS */
1076 *word = w_addchar (*word, word_length, max_length,
1085 /* Chop off trailing newlines (required by POSIX.2) */
1086 /* Ensure we don't go back further than the beginning of the
1087 substitution (i.e. remove maxnewlines bytes at most) */
1088 while (maxnewlines-- != 0 &&
1089 *word_length > 0 && (*word)[*word_length - 1] == '\n')
1091 (*word)[--*word_length] = '\0';
1093 /* If the last word was entirely newlines, turn it into a new word
1094 * which can be ignored if there's nothing following it. */
1095 if (*word_length == 0)
1098 *word = w_newword (word_length, max_length);
1103 __close (fildes[0]);
1106 /* Check for syntax error (re-execute but with "-n" flag) */
1107 if (buflen < 1 && status != 0)
1116 __kill (pid, SIGKILL);
1117 TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0));
1118 __close (fildes[0]);
1119 return WRDE_NOSPACE;
1124 parse_comm (char **word, size_t *word_length, size_t *max_length,
1125 const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
1126 const char *ifs, const char *ifs_white)
1128 /* We are poised just after "$(" */
1129 int paren_depth = 1;
1131 int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
1134 char *comm = w_newword (&comm_length, &comm_maxlen);
1136 for (; words[*offset]; ++(*offset))
1138 switch (words[*offset])
1143 else if (quoted == 1)
1151 else if (quoted == 2)
1157 if (!quoted && --paren_depth == 0)
1159 /* Go -- give script to the shell */
1162 #ifdef __libc_ptf_call
1163 /* We do not want the exec_comm call to be cut short
1164 by a thread cancellation since cleanup is very
1165 ugly. Therefore disable cancellation for
1167 // XXX Ideally we do want the thread being cancelable.
1168 // XXX If demand is there we'll change it.
1169 int state = PTHREAD_CANCEL_ENABLE;
1170 __libc_ptf_call (pthread_setcancelstate,
1171 (PTHREAD_CANCEL_DISABLE, &state), 0);
1174 error = exec_comm (comm, word, word_length, max_length,
1175 flags, pwordexp, ifs, ifs_white);
1177 #ifdef __libc_ptf_call
1178 __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
1187 /* This is just part of the script */
1195 comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
1197 return WRDE_NOSPACE;
1200 /* Premature end. */
1208 parse_param (char **word, size_t *word_length, size_t *max_length,
1209 const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
1210 const char *ifs, const char *ifs_white, int quoted)
1212 /* We are poised just after "$" */
1216 ACT_RP_SHORT_LEFT = '#',
1217 ACT_RP_LONG_LEFT = 'L',
1218 ACT_RP_SHORT_RIGHT = '%',
1219 ACT_RP_LONG_RIGHT = 'R',
1220 ACT_NULL_ERROR = '?',
1221 ACT_NULL_SUBST = '-',
1222 ACT_NONNULL_SUBST = '+',
1223 ACT_NULL_ASSIGN = '='
1229 size_t start = *offset;
1233 enum action action = ACT_NONE;
1238 int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
1242 int brace = words[*offset] == '{';
1244 env = w_newword (&env_length, &env_maxlen);
1245 pattern = w_newword (&pat_length, &pat_maxlen);
1250 /* First collect the parameter name. */
1252 if (words[*offset] == '#')
1260 if (isalpha (words[*offset]) || words[*offset] == '_')
1262 /* Normal parameter name. */
1265 env = w_addchar (env, &env_length, &env_maxlen,
1270 while (isalnum (words[++*offset]) || words[*offset] == '_');
1272 else if (isdigit (words[*offset]))
1274 /* Numeric parameter name. */
1278 env = w_addchar (env, &env_length, &env_maxlen,
1285 while (isdigit(words[++*offset]));
1287 else if (strchr ("*@$", words[*offset]) != NULL)
1289 /* Special parameter. */
1291 env = w_addchar (env, &env_length, &env_maxlen,
1305 /* Check for special action to be applied to the value. */
1306 switch (words[*offset])
1313 action = ACT_RP_SHORT_LEFT;
1314 if (words[1 + *offset] == '#')
1317 action = ACT_RP_LONG_LEFT;
1322 action = ACT_RP_SHORT_RIGHT;
1323 if (words[1 + *offset] == '%')
1326 action = ACT_RP_LONG_RIGHT;
1331 if (strchr ("-=?+", words[1 + *offset]) == NULL)
1335 action = words[++*offset];
1342 action = words[*offset];
1349 /* Now collect the pattern, but don't expand it yet. */
1351 for (; words[*offset]; ++(*offset))
1353 switch (words[*offset])
1356 if (!pattern_is_quoted)
1361 if (!pattern_is_quoted)
1370 if (pattern_is_quoted)
1371 /* Quoted; treat as normal character. */
1374 /* Otherwise, it's an escape: next character is literal. */
1375 if (words[++*offset] == '\0')
1378 pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
1379 if (pattern == NULL)
1385 if (pattern_is_quoted == 0)
1386 pattern_is_quoted = 1;
1387 else if (pattern_is_quoted == 1)
1388 pattern_is_quoted = 0;
1393 if (pattern_is_quoted == 0)
1394 pattern_is_quoted = 2;
1395 else if (pattern_is_quoted == 2)
1396 pattern_is_quoted = 0;
1401 pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
1403 if (pattern == NULL)
1408 /* End of input string -- remember to reparse the character that we
1413 if (words[start] == '{' && words[*offset] != '}')
1420 /* $# expands to the number of positional parameters */
1422 value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
1427 /* Just $ on its own */
1428 *offset = start - 1;
1429 *word = w_addchar (*word, word_length, max_length, '$');
1430 return *word ? 0 : WRDE_NOSPACE;
1433 /* Is it a numeric parameter? */
1434 else if (isdigit (env[0]))
1438 if (n >= __libc_argc)
1439 /* Substitute NULL. */
1442 /* Replace with appropriate positional parameter. */
1443 value = __libc_argv[n];
1445 /* Is it a special parameter? */
1452 value = _itoa_word (__getpid (), &buffer[20], 10, 0);
1454 /* Is it `${#*}' or `${#@}'? */
1455 else if ((*env == '*' || *env == '@') && seen_hash)
1458 value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
1459 &buffer[20], 10, 0);
1460 *word = w_addstr (*word, word_length, max_length, value);
1463 return *word ? 0 : WRDE_NOSPACE;
1465 /* Is it `$*' or `$@' (unquoted) ? */
1466 else if (*env == '*' || (*env == '@' && !quoted))
1468 size_t plist_len = 0;
1472 /* Build up value parameter by parameter (copy them) */
1473 for (p = 1; __libc_argv[p]; ++p)
1474 plist_len += strlen (__libc_argv[p]) + 1; /* for space */
1475 value = malloc (plist_len);
1480 for (p = 1; __libc_argv[p]; ++p)
1484 end = __stpcpy (end, __libc_argv[p]);
1491 /* Must be a quoted `$@' */
1492 assert (*env == '@' && quoted);
1494 /* Each parameter is a separate word ("$@") */
1495 if (__libc_argc == 2)
1496 value = __libc_argv[1];
1497 else if (__libc_argc > 2)
1501 /* Append first parameter to current word. */
1502 value = w_addstr (*word, word_length, max_length,
1504 if (value == NULL || w_addword (pwordexp, value))
1507 for (p = 2; __libc_argv[p + 1]; p++)
1509 char *newword = __strdup (__libc_argv[p]);
1510 if (newword == NULL || w_addword (pwordexp, newword))
1514 /* Start a new word with the last parameter. */
1515 *word = w_newword (word_length, max_length);
1516 value = __libc_argv[p];
1527 value = getenv (env);
1529 if (value == NULL && (flags & WRDE_UNDEF))
1531 /* Variable not defined. */
1532 error = WRDE_BADVAL;
1536 if (action != ACT_NONE)
1538 int expand_pattern = 0;
1540 /* First, find out if we need to expand pattern (i.e. if we will
1544 case ACT_RP_SHORT_LEFT:
1545 case ACT_RP_LONG_LEFT:
1546 case ACT_RP_SHORT_RIGHT:
1547 case ACT_RP_LONG_RIGHT:
1548 /* Always expand for these. */
1552 case ACT_NULL_ERROR:
1553 case ACT_NULL_SUBST:
1554 case ACT_NULL_ASSIGN:
1555 if (!value || (!*value && colon_seen))
1556 /* If param is unset, or set but null and a colon has been seen,
1557 the expansion of the pattern will be needed. */
1562 case ACT_NONNULL_SUBST:
1563 /* Expansion of word will be needed if parameter is set and not null,
1564 or set null but no colon has been seen. */
1565 if (value && (*value || !colon_seen))
1571 assert (! "Unrecognised action!");
1576 /* We need to perform tilde expansion, parameter expansion,
1577 command substitution, and arithmetic expansion. We also
1578 have to be a bit careful with wildcard characters, as
1579 pattern might be given to fnmatch soon. To do this, we
1580 convert quotes to escapes. */
1586 int quoted = 0; /* 1: single quotes; 2: double */
1588 expanded = w_newword (&exp_len, &exp_maxl);
1589 for (p = pattern; p && *p; p++)
1598 else if (quoted == 0)
1607 else if (quoted == 0)
1617 /* Convert quoted wildchar to escaped wildchar. */
1618 expanded = w_addchar (expanded, &exp_len,
1621 if (expanded == NULL)
1628 error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
1629 &offset, flags, NULL, NULL, NULL, 1);
1644 if (quoted || exp_len)
1648 error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
1664 expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
1666 assert (*p); /* checked when extracted initially */
1667 if (expanded == NULL)
1671 expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);
1673 if (expanded == NULL)
1684 case ACT_RP_SHORT_LEFT:
1685 case ACT_RP_LONG_LEFT:
1686 case ACT_RP_SHORT_RIGHT:
1687 case ACT_RP_LONG_RIGHT:
1693 if (value == NULL || pattern == NULL || *pattern == '\0')
1696 end = value + strlen (value);
1700 case ACT_RP_SHORT_LEFT:
1701 for (p = value; p <= end; ++p)
1705 if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
1710 char *newval = __strdup (p);
1728 case ACT_RP_LONG_LEFT:
1729 for (p = end; p >= value; --p)
1733 if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
1738 char *newval = __strdup (p);
1756 case ACT_RP_SHORT_RIGHT:
1757 for (p = end; p >= value; --p)
1759 if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
1762 newval = malloc (p - value + 1);
1771 *(char *) __mempcpy (newval, value, p - value) = '\0';
1782 case ACT_RP_LONG_RIGHT:
1783 for (p = value; p <= end; ++p)
1785 if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
1788 newval = malloc (p - value + 1);
1797 *(char *) __mempcpy (newval, value, p - value) = '\0';
1815 case ACT_NULL_ERROR:
1816 if (value && *value)
1817 /* Substitute parameter */
1821 if (!colon_seen && value)
1822 /* Substitute NULL */
1826 const char *str = pattern;
1829 str = _("parameter null or not set");
1831 __fxprintf (NULL, "%s: %s\n", env, str);
1838 case ACT_NULL_SUBST:
1839 if (value && *value)
1840 /* Substitute parameter */
1846 if (!colon_seen && value)
1847 /* Substitute NULL */
1850 value = pattern ? __strdup (pattern) : pattern;
1853 if (pattern && !value)
1858 case ACT_NONNULL_SUBST:
1859 if (value && (*value || !colon_seen))
1864 value = pattern ? __strdup (pattern) : pattern;
1867 if (pattern && !value)
1873 /* Substitute NULL */
1878 case ACT_NULL_ASSIGN:
1879 if (value && *value)
1880 /* Substitute parameter */
1883 if (!colon_seen && value)
1885 /* Substitute NULL */
1894 value = pattern ? __strdup (pattern) : pattern;
1897 if (pattern && !value)
1900 __setenv (env, value, 1);
1904 assert (! "Unrecognised action!");
1915 char param_length[21];
1916 param_length[20] = '\0';
1917 *word = w_addstr (*word, word_length, max_length,
1918 _itoa_word (value ? strlen (value) : 0,
1919 ¶m_length[20], 10, 0));
1922 assert (value != NULL);
1926 return *word ? 0 : WRDE_NOSPACE;
1932 if (quoted || !pwordexp)
1934 /* Quoted - no field split */
1935 *word = w_addstr (*word, word_length, max_length, value);
1939 return *word ? 0 : WRDE_NOSPACE;
1943 /* Need to field-split */
1944 char *value_copy = __strdup (value); /* Don't modify value */
1945 char *field_begin = value_copy;
1946 int seen_nonws_ifs = 0;
1951 if (value_copy == NULL)
1956 char *field_end = field_begin;
1959 /* If this isn't the first field, start a new word */
1960 if (field_begin != value_copy)
1962 if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
1968 *word = w_newword (word_length, max_length);
1971 /* Skip IFS whitespace before the field */
1972 field_begin += strspn (field_begin, ifs_white);
1974 if (!seen_nonws_ifs && *field_begin == 0)
1975 /* Nothing but whitespace */
1978 /* Search for the end of the field */
1979 field_end = field_begin + strcspn (field_begin, ifs);
1981 /* Set up pointer to the character after end of field and
1982 skip whitespace IFS after it. */
1983 next_field = field_end + strspn (field_end, ifs_white);
1985 /* Skip at most one non-whitespace IFS character after the field */
1987 if (*next_field && strchr (ifs, *next_field))
1993 /* Null-terminate it */
1996 /* Tag a copy onto the current word */
1997 *word = w_addstr (*word, word_length, max_length, field_begin);
1999 if (*word == NULL && *field_begin != '\0')
2005 field_begin = next_field;
2007 while (seen_nonws_ifs || *field_begin);
2019 error = WRDE_NOSPACE;
2023 error = WRDE_SYNTAX;
2035 parse_dollars (char **word, size_t *word_length, size_t *max_length,
2036 const char *words, size_t *offset, int flags,
2037 wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
2040 /* We are poised _at_ "$" */
2041 switch (words[1 + *offset])
2046 *word = w_addchar (*word, word_length, max_length, '$');
2047 return *word ? 0 : WRDE_NOSPACE;
2050 if (words[2 + *offset] == '(')
2052 /* Differentiate between $((1+3)) and $((echo);(ls)) */
2053 int i = 3 + *offset;
2055 while (words[i] && !(depth == 0 && words[i] == ')'))
2057 if (words[i] == '(')
2059 else if (words[i] == ')')
2065 if (words[i] == ')' && words[i + 1] == ')')
2068 /* Call parse_arith -- 0 is for "no brackets" */
2069 return parse_arith (word, word_length, max_length, words, offset,
2074 if (flags & WRDE_NOCMD)
2078 return parse_comm (word, word_length, max_length, words, offset, flags,
2079 quoted? NULL : pwordexp, ifs, ifs_white);
2083 /* Call parse_arith -- 1 is for "brackets" */
2084 return parse_arith (word, word_length, max_length, words, offset, flags,
2089 ++(*offset); /* parse_param needs to know if "{" is there */
2090 return parse_param (word, word_length, max_length, words, offset, flags,
2091 pwordexp, ifs, ifs_white, quoted);
2097 parse_backtick (char **word, size_t *word_length, size_t *max_length,
2098 const char *words, size_t *offset, int flags,
2099 wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
2101 /* We are poised just after "`" */
2106 char *comm = w_newword (&comm_length, &comm_maxlen);
2108 for (; words[*offset]; ++(*offset))
2110 switch (words[*offset])
2113 /* Go -- give the script to the shell */
2114 error = exec_comm (comm, word, word_length, max_length, flags,
2115 pwordexp, ifs, ifs_white);
2122 error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
2135 error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
2147 squoting = 1 - squoting;
2149 comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
2151 return WRDE_NOSPACE;
2162 parse_dquote (char **word, size_t *word_length, size_t *max_length,
2163 const char *words, size_t *offset, int flags,
2164 wordexp_t *pwordexp, const char * ifs, const char * ifs_white)
2166 /* We are poised just after a double-quote */
2169 for (; words[*offset]; ++(*offset))
2171 switch (words[*offset])
2177 error = parse_dollars (word, word_length, max_length, words, offset,
2178 flags, pwordexp, ifs, ifs_white, 1);
2179 /* The ``1'' here is to tell parse_dollars not to
2180 * split the fields. It may need to, however ("$@").
2188 if (flags & WRDE_NOCMD)
2192 error = parse_backtick (word, word_length, max_length, words,
2193 offset, flags, NULL, NULL, NULL);
2194 /* The first NULL here is to tell parse_backtick not to
2203 error = parse_qtd_backslash (word, word_length, max_length, words,
2212 *word = w_addchar (*word, word_length, max_length, words[*offset]);
2214 return WRDE_NOSPACE;
2218 /* Unterminated string */
2223 * wordfree() is to be called after pwordexp is finished with.
2227 wordfree (wordexp_t *pwordexp)
2230 /* wordexp can set pwordexp to NULL */
2231 if (pwordexp && pwordexp->we_wordv)
2233 char **wordv = pwordexp->we_wordv;
2235 for (wordv += pwordexp->we_offs; *wordv; ++wordv)
2238 free (pwordexp->we_wordv);
2239 pwordexp->we_wordv = NULL;
2242 libc_hidden_def (wordfree)
2249 wordexp (const char *words, wordexp_t *pwordexp, int flags)
2251 size_t words_offset;
2254 char *word = w_newword (&word_length, &max_length);
2258 wordexp_t old_word = *pwordexp;
2260 if (flags & WRDE_REUSE)
2262 /* Minimal implementation of WRDE_REUSE for now */
2263 wordfree (pwordexp);
2264 old_word.we_wordv = NULL;
2267 if ((flags & WRDE_APPEND) == 0)
2269 pwordexp->we_wordc = 0;
2271 if (flags & WRDE_DOOFFS)
2273 pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
2274 if (pwordexp->we_wordv == NULL)
2276 error = WRDE_NOSPACE;
2282 pwordexp->we_wordv = calloc (1, sizeof (char *));
2283 if (pwordexp->we_wordv == NULL)
2285 error = WRDE_NOSPACE;
2289 pwordexp->we_offs = 0;
2293 /* Find out what the field separators are.
2294 * There are two types: whitespace and non-whitespace.
2296 ifs = getenv ("IFS");
2299 /* IFS unset - use <space><tab><newline>. */
2300 ifs = strcpy (ifs_white, " \t\n");
2304 char *whch = ifs_white;
2306 while (*ifsch != '\0')
2308 if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n')
2310 /* Whitespace IFS. See first whether it is already in our
2312 char *runp = ifs_white;
2314 while (runp < whch && *runp != *ifsch)
2326 for (words_offset = 0 ; words[words_offset] ; ++words_offset)
2327 switch (words[words_offset])
2330 error = parse_backslash (&word, &word_length, &max_length, words,
2339 error = parse_dollars (&word, &word_length, &max_length, words,
2340 &words_offset, flags, pwordexp, ifs, ifs_white,
2349 if (flags & WRDE_NOCMD)
2351 error = WRDE_CMDSUB;
2356 error = parse_backtick (&word, &word_length, &max_length, words,
2357 &words_offset, flags, pwordexp, ifs,
2367 error = parse_dquote (&word, &word_length, &max_length, words,
2368 &words_offset, flags, pwordexp, ifs, ifs_white);
2375 error = w_addword (pwordexp, NULL);
2385 error = parse_squote (&word, &word_length, &max_length, words,
2393 error = w_addword (pwordexp, NULL);
2402 error = parse_tilde (&word, &word_length, &max_length, words,
2403 &words_offset, pwordexp->we_wordc);
2413 error = parse_glob (&word, &word_length, &max_length, words,
2414 &words_offset, flags, pwordexp, ifs, ifs_white);
2422 /* Is it a word separator? */
2423 if (strchr (" \t", words[words_offset]) == NULL)
2425 char ch = words[words_offset];
2427 /* Not a word separator -- but is it a valid word char? */
2428 if (strchr ("\n|&;<>(){}", ch))
2431 error = WRDE_BADCHAR;
2435 /* "Ordinary" character -- add it to word */
2436 word = w_addchar (word, &word_length, &max_length,
2440 error = WRDE_NOSPACE;
2447 /* If a word has been delimited, add it to the list. */
2450 error = w_addword (pwordexp, word);
2455 word = w_newword (&word_length, &max_length);
2460 /* There was a word separator at the end */
2461 if (word == NULL) /* i.e. w_newword */
2464 /* There was no field separator at the end */
2465 return w_addword (pwordexp, word);
2469 * free memory used (unless error is WRDE_NOSPACE), and
2470 * set pwordexp members back to what they were.
2475 if (error == WRDE_NOSPACE)
2476 return WRDE_NOSPACE;
2478 if ((flags & WRDE_APPEND) == 0)
2479 wordfree (pwordexp);
2481 *pwordexp = old_word;