1 /* variables.c -- Functions for hacking shell variables. */
3 /* Copyright (C) 1987-2013 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 Bash is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Bash. If not, see <http://www.gnu.org/licenses/>.
23 #include "bashtypes.h"
24 #include "posixstat.h"
25 #include "posixtime.h"
28 # if defined (__QNXNTO__)
29 # include <sys/netmgr.h>
32 # endif /* !__QNXNTO__ */
35 #if defined (HAVE_UNISTD_H)
40 #include "chartypes.h"
41 #if defined (HAVE_PWD_H)
47 #define NEED_XTRACE_SET_DECL
51 #include "execute_cmd.h"
53 #include "mailcheck.h"
62 #include "builtins/getopt.h"
63 #include "builtins/common.h"
64 #include "builtins/builtext.h"
66 #if defined (READLINE)
67 # include "bashline.h"
68 # include <readline/readline.h>
70 # include <tilde/tilde.h>
74 # include "bashhist.h"
75 # include <readline/history.h>
78 #if defined (PROGRAMMABLE_COMPLETION)
79 # include "pcomplete.h"
82 #define TEMPENV_HASH_BUCKETS 4 /* must be power of two */
84 #define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
86 extern char **environ;
88 /* Variables used here and defined in other files. */
89 extern int posixly_correct;
90 extern int line_number, line_number_base;
91 extern int subshell_environment, indirection_level, subshell_level;
92 extern int build_version, patch_level;
93 extern int expanding_redir;
94 extern int last_command_exit_value;
95 extern char *dist_version, *release_status;
96 extern char *shell_name;
97 extern char *primary_prompt, *secondary_prompt;
98 extern char *current_host_name;
99 extern sh_builtin_func_t *this_shell_builtin;
100 extern SHELL_VAR *this_shell_function;
101 extern char *the_printed_command_except_trap;
102 extern char *this_command_name;
103 extern char *command_execution_string;
104 extern time_t shell_start_time;
105 extern int assigning_in_environment;
106 extern int executing_builtin;
107 extern int funcnest_max;
109 #if defined (READLINE)
110 extern int no_line_editing;
111 extern int perform_hostname_completion;
114 /* The list of shell variables that the user has created at the global
115 scope, or that came from the environment. */
116 VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL;
118 /* The current list of shell variables, including function scopes */
119 VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL;
121 /* The list of shell functions that the user has created, or that came from
123 HASH_TABLE *shell_functions = (HASH_TABLE *)NULL;
125 #if defined (DEBUGGER)
126 /* The table of shell function definitions that the user defined or that
127 came from the environment. */
128 HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL;
131 /* The current variable context. This is really a count of how deep into
132 executing functions we are. */
133 int variable_context = 0;
135 /* The set of shell assignments which are made only in the environment
136 for a single command. */
137 HASH_TABLE *temporary_env = (HASH_TABLE *)NULL;
139 /* Set to non-zero if an assignment error occurs while putting variables
140 into the temporary environment. */
141 int tempenv_assign_error;
143 /* Some funky variables which are known about specially. Here is where
144 "$*", "$1", and all the cruft is kept. */
145 char *dollar_vars[10];
146 WORD_LIST *rest_of_args = (WORD_LIST *)NULL;
148 /* The value of $$. */
149 pid_t dollar_dollar_pid;
151 /* Non-zero means that we have to remake EXPORT_ENV. */
152 int array_needs_making = 1;
154 /* The number of times BASH has been executed. This is set
155 by initialize_variables (). */
158 /* An array which is passed to commands as their environment. It is
159 manufactured from the union of the initial environment and the
160 shell variables that are marked for export. */
161 char **export_env = (char **)NULL;
162 static int export_env_index;
163 static int export_env_size;
165 #if defined (READLINE)
166 static int winsize_assignment; /* currently assigning to LINES or COLUMNS */
169 static HASH_TABLE *last_table_searched; /* hash_lookup sets this */
171 /* Some forward declarations. */
172 static void create_variable_tables __P((void));
174 static void set_machine_vars __P((void));
175 static void set_home_var __P((void));
176 static void set_shell_var __P((void));
177 static char *get_bash_name __P((void));
178 static void initialize_shell_level __P((void));
179 static void uidset __P((void));
180 #if defined (ARRAY_VARS)
181 static void make_vers_array __P((void));
184 static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
185 #if defined (ARRAY_VARS)
186 static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
188 static SHELL_VAR *get_self __P((SHELL_VAR *));
190 #if defined (ARRAY_VARS)
191 static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
192 static SHELL_VAR *init_dynamic_assoc_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
195 static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t, char *));
196 static SHELL_VAR *get_seconds __P((SHELL_VAR *));
197 static SHELL_VAR *init_seconds_var __P((void));
199 static int brand __P((void));
200 static void sbrand __P((unsigned long)); /* set bash random number generator. */
201 static void seedrand __P((void)); /* seed generator randomly */
202 static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t, char *));
203 static SHELL_VAR *get_random __P((SHELL_VAR *));
205 static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t, char *));
206 static SHELL_VAR *get_lineno __P((SHELL_VAR *));
208 static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t, char *));
209 static SHELL_VAR *get_subshell __P((SHELL_VAR *));
211 static SHELL_VAR *get_bashpid __P((SHELL_VAR *));
213 #if defined (HISTORY)
214 static SHELL_VAR *get_histcmd __P((SHELL_VAR *));
217 #if defined (READLINE)
218 static SHELL_VAR *get_comp_wordbreaks __P((SHELL_VAR *));
219 static SHELL_VAR *assign_comp_wordbreaks __P((SHELL_VAR *, char *, arrayind_t, char *));
222 #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
223 static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t, char *));
224 static SHELL_VAR *get_dirstack __P((SHELL_VAR *));
227 #if defined (ARRAY_VARS)
228 static SHELL_VAR *get_groupset __P((SHELL_VAR *));
230 static SHELL_VAR *build_hashcmd __P((SHELL_VAR *));
231 static SHELL_VAR *get_hashcmd __P((SHELL_VAR *));
232 static SHELL_VAR *assign_hashcmd __P((SHELL_VAR *, char *, arrayind_t, char *));
234 static SHELL_VAR *build_aliasvar __P((SHELL_VAR *));
235 static SHELL_VAR *get_aliasvar __P((SHELL_VAR *));
236 static SHELL_VAR *assign_aliasvar __P((SHELL_VAR *, char *, arrayind_t, char *));
240 static SHELL_VAR *get_funcname __P((SHELL_VAR *));
241 static SHELL_VAR *init_funcname_var __P((void));
243 static void initialize_dynamic_variables __P((void));
245 static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *));
246 static SHELL_VAR *new_shell_variable __P((const char *));
247 static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *));
248 static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int));
250 static void dispose_variable_value __P((SHELL_VAR *));
251 static void free_variable_hash_data __P((PTR_T));
253 static VARLIST *vlist_alloc __P((int));
254 static VARLIST *vlist_realloc __P((VARLIST *, int));
255 static void vlist_add __P((VARLIST *, SHELL_VAR *, int));
257 static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
259 static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **));
261 static SHELL_VAR **vapply __P((sh_var_map_func_t *));
262 static SHELL_VAR **fapply __P((sh_var_map_func_t *));
264 static int visible_var __P((SHELL_VAR *));
265 static int visible_and_exported __P((SHELL_VAR *));
266 static int export_environment_candidate __P((SHELL_VAR *));
267 static int local_and_exported __P((SHELL_VAR *));
268 static int variable_in_context __P((SHELL_VAR *));
269 #if defined (ARRAY_VARS)
270 static int visible_array_vars __P((SHELL_VAR *));
273 static SHELL_VAR *find_nameref_at_context __P((SHELL_VAR *, VAR_CONTEXT *));
274 static SHELL_VAR *find_variable_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
275 static SHELL_VAR *find_variable_last_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
277 static SHELL_VAR *bind_tempenv_variable __P((const char *, char *));
278 static void push_temp_var __P((PTR_T));
279 static void propagate_temp_var __P((PTR_T));
280 static void dispose_temporary_env __P((sh_free_func_t *));
282 static inline char *mk_env_string __P((const char *, const char *));
283 static char **make_env_array_from_var_list __P((SHELL_VAR **));
284 static char **make_var_export_array __P((VAR_CONTEXT *));
285 static char **make_func_export_array __P((void));
286 static void add_temp_array_to_env __P((char **, int, int));
288 static int n_shell_variables __P((void));
289 static int set_context __P((SHELL_VAR *));
291 static void push_func_var __P((PTR_T));
292 static void push_exported_var __P((PTR_T));
294 static inline int find_special_var __P((const char *));
297 create_variable_tables ()
299 if (shell_variables == 0)
301 shell_variables = global_variables = new_var_context ((char *)NULL, 0);
302 shell_variables->scope = 0;
303 shell_variables->table = hash_create (0);
306 if (shell_functions == 0)
307 shell_functions = hash_create (0);
309 #if defined (DEBUGGER)
310 if (shell_function_defs == 0)
311 shell_function_defs = hash_create (0);
315 /* Initialize the shell variables from the current environment.
316 If PRIVMODE is nonzero, don't import functions from ENV or
319 initialize_shell_variables (env, privmode)
323 char *name, *string, *temp_string;
324 int c, char_index, string_index, string_length, ro;
327 create_variable_tables ();
329 for (string_index = 0; string = env[string_index++]; )
333 while ((c = *string++) && c != '=')
335 if (string[-1] == '=')
336 char_index = string - name - 1;
338 /* If there are weird things in the environment, like `=xxx' or a
339 string without an `=', just skip them. */
343 /* ASSERT(name[char_index] == '=') */
344 name[char_index] = '\0';
345 /* Now, name = env variable name, string = env variable value, and
346 char_index == strlen (name) */
348 temp_var = (SHELL_VAR *)NULL;
350 /* If exported function, define it now. Don't import functions from
351 the environment in privileged mode. */
352 if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4))
354 string_length = strlen (string);
355 temp_string = (char *)xmalloc (3 + string_length + char_index);
357 strcpy (temp_string, name);
358 temp_string[char_index] = ' ';
359 strcpy (temp_string + char_index + 1, string);
361 if (posixly_correct == 0 || legal_identifier (name))
362 parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST);
364 /* Ancient backwards compatibility. Old versions of bash exported
365 functions like name()=() {...} */
366 if (name[char_index - 1] == ')' && name[char_index - 2] == '(')
367 name[char_index - 2] = '\0';
369 if (temp_var = find_function (name))
371 VSETATTR (temp_var, (att_exported|att_imported));
372 array_needs_making = 1;
376 if (temp_var = bind_variable (name, string, 0))
378 VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
379 array_needs_making = 1;
381 last_command_exit_value = 1;
382 report_error (_("error importing function definition for `%s'"), name);
386 if (name[char_index - 1] == ')' && name[char_index - 2] == '\0')
387 name[char_index - 2] = '('; /* ) */
389 #if defined (ARRAY_VARS)
391 /* Array variables may not yet be exported. */
392 else if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')')
395 temp_string = extract_array_assignment_list (string, &string_length);
396 temp_var = assign_array_from_string (name, temp_string);
398 VSETATTR (temp_var, (att_exported | att_imported));
399 array_needs_making = 1;
401 # endif /* ARRAY_EXPORT */
404 else if (legal_identifier (name))
410 if (posixly_correct && STREQ (name, "SHELLOPTS"))
412 temp_var = find_variable ("SHELLOPTS");
413 ro = temp_var && readonly_p (temp_var);
415 VUNSETATTR (temp_var, att_readonly);
417 temp_var = bind_variable (name, string, 0);
420 if (legal_identifier (name))
421 VSETATTR (temp_var, (att_exported | att_imported));
423 VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
425 VSETATTR (temp_var, att_readonly);
426 array_needs_making = 1;
430 name[char_index] = '=';
431 /* temp_var can be NULL if it was an exported function with a syntax
432 error (a different bug, but it still shouldn't dump core). */
433 if (temp_var && function_p (temp_var) == 0) /* XXX not yet */
435 CACHE_IMPORTSTR (temp_var, name);
441 /* Set up initial value of $_ */
442 temp_var = set_if_not ("_", dollar_vars[0]);
444 /* Remember this pid. */
445 dollar_dollar_pid = getpid ();
447 /* Now make our own defaults in case the vars that we think are
448 important are missing. */
449 temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);
451 set_auto_export (temp_var); /* XXX */
454 temp_var = set_if_not ("TERM", "dumb");
456 set_auto_export (temp_var); /* XXX */
459 #if defined (__QNX__)
460 /* set node id -- don't import it from the environment */
463 # if defined (__QNXNTO__)
464 netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name));
466 qnx_nidtostr (getnid (), node_name, sizeof (node_name));
468 temp_var = bind_variable ("NODE", node_name, 0);
469 set_auto_export (temp_var);
473 /* set up the prompts. */
474 if (interactive_shell)
476 #if defined (PROMPT_STRING_DECODE)
477 set_if_not ("PS1", primary_prompt);
479 if (current_user.uid == -1)
480 get_current_user_info ();
481 set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt);
483 set_if_not ("PS2", secondary_prompt);
485 set_if_not ("PS4", "+ ");
487 /* Don't allow IFS to be imported from the environment. */
488 temp_var = bind_variable ("IFS", " \t\n", 0);
491 /* Magic machine types. Pretty convenient. */
494 /* Default MAILCHECK for interactive shells. Defer the creation of a
495 default MAILPATH until the startup files are read, because MAIL
496 names a mail file if MAILPATH is not set, and we should provide a
497 default only if neither is set. */
498 if (interactive_shell)
500 temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60");
501 VSETATTR (temp_var, att_integer);
504 /* Do some things with shell level. */
505 initialize_shell_level ();
509 /* Initialize the `getopts' stuff. */
510 temp_var = bind_variable ("OPTIND", "1", 0);
511 VSETATTR (temp_var, att_integer);
513 bind_variable ("OPTERR", "1", 0);
516 if (login_shell == 1 && posixly_correct == 0)
519 /* Get the full pathname to THIS shell, and set the BASH variable
521 name = get_bash_name ();
522 temp_var = bind_variable ("BASH", name, 0);
525 /* Make the exported environment variable SHELL be the user's login
526 shell. Note that the `tset' command looks at this variable
527 to determine what style of commands to output; if it ends in "csh",
528 then C-shell commands are output, else Bourne shell commands. */
531 /* Make a variable called BASH_VERSION which contains the version info. */
532 bind_variable ("BASH_VERSION", shell_version_string (), 0);
533 #if defined (ARRAY_VARS)
537 if (command_execution_string)
538 bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0);
540 /* Find out if we're supposed to be in Posix.2 mode via an
541 environment variable. */
542 temp_var = find_variable ("POSIXLY_CORRECT");
544 temp_var = find_variable ("POSIX_PEDANTIC");
545 if (temp_var && imported_p (temp_var))
546 sv_strict_posix (temp_var->name);
548 #if defined (HISTORY)
549 /* Set history variables to defaults, and then do whatever we would
550 do if the variable had just been set. Do this only in the case
551 that we are remembering commands on the history list. */
552 if (remember_on_history)
554 name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0);
556 set_if_not ("HISTFILE", name);
561 /* Seed the random number generator. */
564 /* Handle some "special" variables that we may have inherited from a
566 if (interactive_shell)
568 temp_var = find_variable ("IGNOREEOF");
570 temp_var = find_variable ("ignoreeof");
571 if (temp_var && imported_p (temp_var))
572 sv_ignoreeof (temp_var->name);
575 #if defined (HISTORY)
576 if (interactive_shell && remember_on_history)
578 sv_history_control ("HISTCONTROL");
579 sv_histignore ("HISTIGNORE");
580 sv_histtimefmt ("HISTTIMEFORMAT");
584 #if defined (READLINE) && defined (STRICT_POSIX)
585 /* POSIXLY_CORRECT will only be 1 here if the shell was compiled
587 if (interactive_shell && posixly_correct && no_line_editing == 0)
588 rl_prefer_env_winsize = 1;
589 #endif /* READLINE && STRICT_POSIX */
594 * I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT
595 * and SSH2_CLIENT alone. I'm going to rely on the shell_level check in
596 * isnetconn() to avoid running the startup files more often than wanted.
597 * That will, of course, only work if the user's login shell is bash, so
598 * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined
602 temp_var = find_variable ("SSH_CLIENT");
603 if (temp_var && imported_p (temp_var))
605 VUNSETATTR (temp_var, att_exported);
606 array_needs_making = 1;
608 temp_var = find_variable ("SSH2_CLIENT");
609 if (temp_var && imported_p (temp_var))
611 VUNSETATTR (temp_var, att_exported);
612 array_needs_making = 1;
616 /* Get the user's real and effective user ids. */
619 temp_var = find_variable ("BASH_XTRACEFD");
620 if (temp_var && imported_p (temp_var))
621 sv_xtracefd (temp_var->name);
623 /* Initialize the dynamic variables, and seed their values. */
624 initialize_dynamic_variables ();
627 /* **************************************************************** */
629 /* Setting values for special shell variables */
631 /* **************************************************************** */
638 temp_var = set_if_not ("HOSTTYPE", HOSTTYPE);
639 temp_var = set_if_not ("OSTYPE", OSTYPE);
640 temp_var = set_if_not ("MACHTYPE", MACHTYPE);
642 temp_var = set_if_not ("HOSTNAME", current_host_name);
645 /* Set $HOME to the information in the password file if we didn't get
646 it from the environment. */
648 /* This function is not static so the tilde and readline libraries can
653 if (current_user.home_dir == 0)
654 get_current_user_info ();
655 return current_user.home_dir;
663 temp_var = find_variable ("HOME");
665 temp_var = bind_variable ("HOME", sh_get_home_dir (), 0);
667 VSETATTR (temp_var, att_exported);
671 /* Set $SHELL to the user's login shell if it is not already set. Call
672 get_current_user_info if we haven't already fetched the shell. */
678 temp_var = find_variable ("SHELL");
681 if (current_user.shell == 0)
682 get_current_user_info ();
683 temp_var = bind_variable ("SHELL", current_user.shell, 0);
686 VSETATTR (temp_var, att_exported);
695 if ((login_shell == 1) && RELPATH(shell_name))
697 if (current_user.shell == 0)
698 get_current_user_info ();
699 name = savestring (current_user.shell);
701 else if (ABSPATH(shell_name))
702 name = savestring (shell_name);
703 else if (shell_name[0] == '.' && shell_name[1] == '/')
705 /* Fast path for common case. */
709 cdir = get_string_value ("PWD");
713 name = (char *)xmalloc (len + strlen (shell_name) + 1);
715 strcpy (name + len, shell_name + 1);
718 name = savestring (shell_name);
725 tname = find_user_command (shell_name);
729 /* Try the current directory. If there is not an executable
730 there, just punt and use the login shell. */
731 s = file_status (shell_name);
734 tname = make_absolute (shell_name, get_string_value ("PWD"));
735 if (*shell_name == '.')
737 name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
748 if (current_user.shell == 0)
749 get_current_user_info ();
750 name = savestring (current_user.shell);
755 name = full_pathname (tname);
764 adjust_shell_level (change)
767 char new_level[5], *old_SHLVL;
771 old_SHLVL = get_string_value ("SHLVL");
772 if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0)
775 shell_level = old_level + change;
778 else if (shell_level > 1000)
780 internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level);
784 /* We don't need the full generality of itos here. */
785 if (shell_level < 10)
787 new_level[0] = shell_level + '0';
790 else if (shell_level < 100)
792 new_level[0] = (shell_level / 10) + '0';
793 new_level[1] = (shell_level % 10) + '0';
796 else if (shell_level < 1000)
798 new_level[0] = (shell_level / 100) + '0';
799 old_level = shell_level % 100;
800 new_level[1] = (old_level / 10) + '0';
801 new_level[2] = (old_level % 10) + '0';
805 temp_var = bind_variable ("SHLVL", new_level, 0);
806 set_auto_export (temp_var);
810 initialize_shell_level ()
812 adjust_shell_level (1);
815 /* If we got PWD from the environment, update our idea of the current
816 working directory. In any case, make sure that PWD exists before
817 checking it. It is possible for getcwd () to fail on shell startup,
818 and in that case, PWD would be undefined. If this is an interactive
819 login shell, see if $HOME is the current working directory, and if
820 that's not the same string as $PWD, set PWD=$HOME. */
825 SHELL_VAR *temp_var, *home_var;
826 char *temp_string, *home_string;
828 home_var = find_variable ("HOME");
829 home_string = home_var ? value_cell (home_var) : (char *)NULL;
831 temp_var = find_variable ("PWD");
832 if (temp_var && imported_p (temp_var) &&
833 (temp_string = value_cell (temp_var)) &&
834 same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL))
835 set_working_directory (temp_string);
836 else if (home_string && interactive_shell && login_shell &&
837 same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL))
839 set_working_directory (home_string);
840 temp_var = bind_variable ("PWD", home_string, 0);
841 set_auto_export (temp_var);
845 temp_string = get_working_directory ("shell-init");
848 temp_var = bind_variable ("PWD", temp_string, 0);
849 set_auto_export (temp_var);
854 /* According to the Single Unix Specification, v2, $OLDPWD is an
855 `environment variable' and therefore should be auto-exported.
856 Make a dummy invisible variable for OLDPWD, and mark it as exported. */
857 temp_var = bind_variable ("OLDPWD", (char *)NULL, 0);
858 VSETATTR (temp_var, (att_exported | att_invisible));
861 /* Make a variable $PPID, which holds the pid of the shell's parent. */
865 char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name;
868 name = inttostr (getppid (), namebuf, sizeof(namebuf));
869 temp_var = find_variable ("PPID");
871 VUNSETATTR (temp_var, (att_readonly | att_exported));
872 temp_var = bind_variable ("PPID", name, 0);
873 VSETATTR (temp_var, (att_readonly | att_integer));
879 char buff[INT_STRLEN_BOUND(uid_t) + 1], *b;
880 register SHELL_VAR *v;
882 b = inttostr (current_user.uid, buff, sizeof (buff));
883 v = find_variable ("UID");
886 v = bind_variable ("UID", b, 0);
887 VSETATTR (v, (att_readonly | att_integer));
890 if (current_user.euid != current_user.uid)
891 b = inttostr (current_user.euid, buff, sizeof (buff));
893 v = find_variable ("EUID");
896 v = bind_variable ("EUID", b, 0);
897 VSETATTR (v, (att_readonly | att_integer));
901 #if defined (ARRAY_VARS)
907 char *s, d[32], b[INT_STRLEN_BOUND(int) + 1];
909 unbind_variable ("BASH_VERSINFO");
911 vv = make_new_array_variable ("BASH_VERSINFO");
912 av = array_cell (vv);
913 strcpy (d, dist_version);
917 array_insert (av, 0, d);
918 array_insert (av, 1, s);
919 s = inttostr (patch_level, b, sizeof (b));
920 array_insert (av, 2, s);
921 s = inttostr (build_version, b, sizeof (b));
922 array_insert (av, 3, s);
923 array_insert (av, 4, release_status);
924 array_insert (av, 5, MACHTYPE);
926 VSETATTR (vv, att_readonly);
928 #endif /* ARRAY_VARS */
930 /* Set the environment variables $LINES and $COLUMNS in response to
931 a window size change. */
933 sh_set_lines_and_columns (lines, cols)
936 char val[INT_STRLEN_BOUND(int) + 1], *v;
938 #if defined (READLINE)
939 /* If we are currently assigning to LINES or COLUMNS, don't do anything. */
940 if (winsize_assignment)
944 v = inttostr (lines, val, sizeof (val));
945 bind_variable ("LINES", v, 0);
947 v = inttostr (cols, val, sizeof (val));
948 bind_variable ("COLUMNS", v, 0);
951 /* **************************************************************** */
953 /* Printing variables and values */
955 /* **************************************************************** */
957 /* Print LIST (a list of shell variables) to stdout in such a way that
958 they can be read back in. */
960 print_var_list (list)
961 register SHELL_VAR **list;
964 register SHELL_VAR *var;
966 for (i = 0; list && (var = list[i]); i++)
967 if (invisible_p (var) == 0)
968 print_assignment (var);
971 /* Print LIST (a list of shell functions) to stdout in such a way that
972 they can be read back in. */
974 print_func_list (list)
975 register SHELL_VAR **list;
978 register SHELL_VAR *var;
980 for (i = 0; list && (var = list[i]); i++)
982 printf ("%s ", var->name);
983 print_var_function (var);
988 /* Print the value of a single SHELL_VAR. No newline is
989 output, but the variable is printed in such a way that
990 it can be read back in. */
992 print_assignment (var)
995 if (var_isset (var) == 0)
998 if (function_p (var))
1000 printf ("%s", var->name);
1001 print_var_function (var);
1004 #if defined (ARRAY_VARS)
1005 else if (array_p (var))
1006 print_array_assignment (var, 0);
1007 else if (assoc_p (var))
1008 print_assoc_assignment (var, 0);
1009 #endif /* ARRAY_VARS */
1012 printf ("%s=", var->name);
1013 print_var_value (var, 1);
1018 /* Print the value cell of VAR, a shell variable. Do not print
1019 the name, nor leading/trailing newline. If QUOTE is non-zero,
1020 and the value contains shell metacharacters, quote the value
1021 in such a way that it can be read back in. */
1023 print_var_value (var, quote)
1029 if (var_isset (var) == 0)
1032 if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var)))
1034 t = ansic_quote (value_cell (var), 0, (int *)0);
1038 else if (quote && sh_contains_shell_metas (value_cell (var)))
1040 t = sh_single_quote (value_cell (var));
1045 printf ("%s", value_cell (var));
1048 /* Print the function cell of VAR, a shell variable. Do not
1049 print the name, nor leading/trailing newline. */
1051 print_var_function (var)
1056 if (function_p (var) && var_isset (var))
1058 x = named_function_string ((char *)NULL, function_cell(var), FUNC_MULTILINE|FUNC_EXTERNAL);
1063 /* **************************************************************** */
1065 /* Dynamic Variables */
1067 /* **************************************************************** */
1069 /* DYNAMIC VARIABLES
1071 These are variables whose values are generated anew each time they are
1072 referenced. These are implemented using a pair of function pointers
1073 in the struct variable: assign_func, which is called from bind_variable
1074 and, if arrays are compiled into the shell, some of the functions in
1075 arrayfunc.c, and dynamic_value, which is called from find_variable.
1077 assign_func is called from bind_variable_internal, if
1078 bind_variable_internal discovers that the variable being assigned to
1079 has such a function. The function is called as
1080 SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind)
1081 and the (SHELL_VAR *)temp is returned as the value of bind_variable. It
1082 is usually ENTRY (self). IND is an index for an array variable, and
1085 dynamic_value is called from find_variable_internal to return a `new'
1086 value for the specified dynamic varible. If this function is NULL,
1087 the variable is treated as a `normal' shell variable. If it is not,
1088 however, then this function is called like this:
1089 tempvar = (*(var->dynamic_value)) (var);
1091 Sometimes `tempvar' will replace the value of `var'. Other times, the
1092 shell will simply use the string value. Pretty object-oriented, huh?
1094 Be warned, though: if you `unset' a special variable, it loses its
1095 special meaning, even if you subsequently set it.
1097 The special assignment code would probably have been better put in
1098 subst.c: do_assignment_internal, in the same style as
1099 stupidly_hack_special_variables, but I wanted the changes as
1100 localized as possible. */
1102 #define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \
1105 v = bind_variable (var, (val), 0); \
1106 v->dynamic_value = gfunc; \
1107 v->assign_func = afunc; \
1111 #define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \
1114 v = make_new_array_variable (var); \
1115 v->dynamic_value = gfunc; \
1116 v->assign_func = afunc; \
1120 #define INIT_DYNAMIC_ASSOC_VAR(var, gfunc, afunc) \
1123 v = make_new_assoc_variable (var); \
1124 v->dynamic_value = gfunc; \
1125 v->assign_func = afunc; \
1130 null_assign (self, value, unused, key)
1139 #if defined (ARRAY_VARS)
1141 null_array_assign (self, value, ind, key)
1151 /* Degenerate `dynamic_value' function; just returns what's passed without
1160 #if defined (ARRAY_VARS)
1161 /* A generic dynamic array variable initializer. Initialize array variable
1162 NAME with dynamic value function GETFUNC and assignment function SETFUNC. */
1164 init_dynamic_array_var (name, getfunc, setfunc, attrs)
1166 sh_var_value_func_t *getfunc;
1167 sh_var_assign_func_t *setfunc;
1172 v = find_variable (name);
1175 INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc);
1177 VSETATTR (v, attrs);
1182 init_dynamic_assoc_var (name, getfunc, setfunc, attrs)
1184 sh_var_value_func_t *getfunc;
1185 sh_var_assign_func_t *setfunc;
1190 v = find_variable (name);
1193 INIT_DYNAMIC_ASSOC_VAR (name, getfunc, setfunc);
1195 VSETATTR (v, attrs);
1200 /* The value of $SECONDS. This is the number of seconds since shell
1201 invocation, or, the number of seconds since the last assignment + the
1202 value of the last assignment. */
1203 static intmax_t seconds_value_assigned;
1206 assign_seconds (self, value, unused, key)
1212 if (legal_number (value, &seconds_value_assigned) == 0)
1213 seconds_value_assigned = 0;
1214 shell_start_time = NOW;
1222 time_t time_since_start;
1225 time_since_start = NOW - shell_start_time;
1226 p = itos(seconds_value_assigned + time_since_start);
1228 FREE (value_cell (var));
1230 VSETATTR (var, att_integer);
1231 var_setvalue (var, p);
1240 v = find_variable ("SECONDS");
1243 if (legal_number (value_cell(v), &seconds_value_assigned) == 0)
1244 seconds_value_assigned = 0;
1246 INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds);
1250 /* The random number seed. You can change this by setting RANDOM. */
1251 static unsigned long rseed = 1;
1252 static int last_random_value;
1253 static int seeded_subshell = 0;
1255 /* A linear congruential random number generator based on the example
1256 one in the ANSI C standard. This one isn't very good, but a more
1257 complicated one is overkill. */
1259 /* Returns a pseudo-random number between 0 and 32767. */
1263 /* From "Random number generators: good ones are hard to find",
1264 Park and Miller, Communications of the ACM, vol. 31, no. 10,
1265 October 1988, p. 1195. filtered through FreeBSD */
1268 /* Can't seed with 0. */
1273 rseed = 16807 * l - 2836 * h;
1276 rseed += 0x7fffffff;
1278 return ((unsigned int)(rseed & 32767)); /* was % 32768 */
1281 /* Set the random number generator seed to SEED. */
1287 last_random_value = 0;
1295 gettimeofday (&tv, NULL);
1296 sbrand (tv.tv_sec ^ tv.tv_usec ^ getpid ());
1300 assign_random (self, value, unused, key)
1306 sbrand (strtoul (value, (char **)NULL, 10));
1307 if (subshell_environment)
1308 seeded_subshell = getpid ();
1313 get_random_number ()
1317 /* Reset for command and process substitution. */
1319 if (subshell_environment && seeded_subshell != pid)
1322 seeded_subshell = pid;
1327 while (rv == last_random_value);
1338 rv = get_random_number ();
1339 last_random_value = rv;
1342 FREE (value_cell (var));
1344 VSETATTR (var, att_integer);
1345 var_setvalue (var, p);
1350 assign_lineno (var, value, unused, key)
1358 if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
1360 line_number = line_number_base = new_value;
1364 /* Function which returns the current line number. */
1372 ln = executing_line_number ();
1374 FREE (value_cell (var));
1375 var_setvalue (var, p);
1380 assign_subshell (var, value, unused, key)
1388 if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
1390 subshell_level = new_value;
1400 p = itos (subshell_level);
1401 FREE (value_cell (var));
1402 var_setvalue (var, p);
1416 FREE (value_cell (var));
1417 VSETATTR (var, att_integer|att_readonly);
1418 var_setvalue (var, p);
1423 get_bash_command (var)
1428 if (the_printed_command_except_trap)
1429 p = savestring (the_printed_command_except_trap);
1432 p = (char *)xmalloc (1);
1435 FREE (value_cell (var));
1436 var_setvalue (var, p);
1440 #if defined (HISTORY)
1447 p = itos (history_number ());
1448 FREE (value_cell (var));
1449 var_setvalue (var, p);
1454 #if defined (READLINE)
1455 /* When this function returns, VAR->value points to malloced memory. */
1457 get_comp_wordbreaks (var)
1460 /* If we don't have anything yet, assign a default value. */
1461 if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0)
1462 enable_hostname_completion (perform_hostname_completion);
1464 FREE (value_cell (var));
1465 var_setvalue (var, savestring (rl_completer_word_break_characters));
1470 /* When this function returns, rl_completer_word_break_characters points to
1473 assign_comp_wordbreaks (self, value, unused, key)
1479 if (rl_completer_word_break_characters &&
1480 rl_completer_word_break_characters != rl_basic_word_break_characters)
1481 free (rl_completer_word_break_characters);
1483 rl_completer_word_break_characters = savestring (value);
1486 #endif /* READLINE */
1488 #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
1490 assign_dirstack (self, value, ind, key)
1496 set_dirstack_element (ind, 1, value);
1507 l = get_directory_stack (0);
1508 a = array_from_word_list (l);
1509 array_dispose (array_cell (self));
1511 var_setarray (self, a);
1514 #endif /* PUSHD AND POPD && ARRAY_VARS */
1516 #if defined (ARRAY_VARS)
1517 /* We don't want to initialize the group set with a call to getgroups()
1518 unless we're asked to, but we only want to do it once. */
1526 static char **group_set = (char **)NULL;
1530 group_set = get_group_list (&ng);
1531 a = array_cell (self);
1532 for (i = 0; i < ng; i++)
1533 array_insert (a, i, group_set[i]);
1539 build_hashcmd (self)
1545 BUCKET_CONTENTS *item;
1547 h = assoc_cell (self);
1551 if (hashed_filenames == 0 || HASH_ENTRIES (hashed_filenames) == 0)
1553 var_setvalue (self, (char *)NULL);
1557 h = assoc_create (hashed_filenames->nbuckets);
1558 for (i = 0; i < hashed_filenames->nbuckets; i++)
1560 for (item = hash_items (i, hashed_filenames); item; item = item->next)
1562 k = savestring (item->key);
1563 v = pathdata(item)->path;
1564 assoc_insert (h, k, v);
1568 var_setvalue (self, (char *)h);
1576 build_hashcmd (self);
1581 assign_hashcmd (self, value, ind, key)
1587 phash_insert (key, value, 0, 0);
1588 return (build_hashcmd (self));
1593 build_aliasvar (self)
1599 BUCKET_CONTENTS *item;
1601 h = assoc_cell (self);
1605 if (aliases == 0 || HASH_ENTRIES (aliases) == 0)
1607 var_setvalue (self, (char *)NULL);
1611 h = assoc_create (aliases->nbuckets);
1612 for (i = 0; i < aliases->nbuckets; i++)
1614 for (item = hash_items (i, aliases); item; item = item->next)
1616 k = savestring (item->key);
1617 v = ((alias_t *)(item->data))->value;
1618 assoc_insert (h, k, v);
1622 var_setvalue (self, (char *)h);
1630 build_aliasvar (self);
1635 assign_aliasvar (self, value, ind, key)
1641 add_alias (key, value);
1642 return (build_aliasvar (self));
1646 #endif /* ARRAY_VARS */
1648 /* If ARRAY_VARS is not defined, this just returns the name of any
1649 currently-executing function. If we have arrays, it's a call stack. */
1654 #if ! defined (ARRAY_VARS)
1656 if (variable_context && this_shell_function)
1658 FREE (value_cell (self));
1659 t = savestring (this_shell_function->name);
1660 var_setvalue (self, t);
1667 make_funcname_visible (on_or_off)
1672 v = find_variable ("FUNCNAME");
1673 if (v == 0 || v->dynamic_value == 0)
1677 VUNSETATTR (v, att_invisible);
1679 VSETATTR (v, att_invisible);
1683 init_funcname_var ()
1687 v = find_variable ("FUNCNAME");
1690 #if defined (ARRAY_VARS)
1691 INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign);
1693 INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign);
1695 VSETATTR (v, att_invisible|att_noassign);
1700 initialize_dynamic_variables ()
1704 v = init_seconds_var ();
1706 INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL);
1707 INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell);
1709 INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random);
1710 VSETATTR (v, att_integer);
1711 INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno);
1712 VSETATTR (v, att_integer);
1714 INIT_DYNAMIC_VAR ("BASHPID", (char *)NULL, get_bashpid, null_assign);
1715 VSETATTR (v, att_integer|att_readonly);
1717 #if defined (HISTORY)
1718 INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL);
1719 VSETATTR (v, att_integer);
1722 #if defined (READLINE)
1723 INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks);
1726 #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
1727 v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0);
1728 #endif /* PUSHD_AND_POPD && ARRAY_VARS */
1730 #if defined (ARRAY_VARS)
1731 v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign);
1733 # if defined (DEBUGGER)
1734 v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset);
1735 v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset);
1736 # endif /* DEBUGGER */
1737 v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset);
1738 v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset);
1740 v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_nofree);
1741 # if defined (ALIAS)
1742 v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_nofree);
1746 v = init_funcname_var ();
1749 /* **************************************************************** */
1751 /* Retrieving variables and values */
1753 /* **************************************************************** */
1755 /* How to get a pointer to the shell variable or function named NAME.
1756 HASHED_VARS is a pointer to the hash table containing the list
1757 of interest (either variables or functions). */
1760 hash_lookup (name, hashed_vars)
1762 HASH_TABLE *hashed_vars;
1764 BUCKET_CONTENTS *bucket;
1766 bucket = hash_search (name, hashed_vars, 0);
1767 /* If we find the name in HASHED_VARS, set LAST_TABLE_SEARCHED to that
1770 last_table_searched = hashed_vars;
1771 return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL);
1775 var_lookup (name, vcontext)
1777 VAR_CONTEXT *vcontext;
1782 v = (SHELL_VAR *)NULL;
1783 for (vc = vcontext; vc; vc = vc->down)
1784 if (v = hash_lookup (name, vc->table))
1790 /* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero,
1791 then also search the temporarily built list of exported variables.
1792 The lookup order is:
1794 shell_variables list
1798 find_variable_internal (name, force_tempenv)
1806 var = (SHELL_VAR *)NULL;
1808 /* If explicitly requested, first look in the temporary environment for
1809 the variable. This allows constructs such as "foo=x eval 'echo $foo'"
1810 to get the `exported' value of $foo. This happens if we are executing
1811 a function or builtin, or if we are looking up a variable in a
1812 "subshell environment". */
1813 search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment);
1815 if (search_tempenv && temporary_env)
1816 var = hash_lookup (name, temporary_env);
1818 vc = shell_variables;
1820 if (search_tempenv == 0 && /* (subshell_environment & SUBSHELL_COMSUB) && */
1822 (this_shell_builtin == eval_builtin || this_shell_builtin == command_builtin))
1824 itrace("find_variable_internal: search_tempenv == 0: skipping VC_BLTNENV");
1825 while (vc && (vc->flags & VC_BLTNENV))
1828 vc = shell_variables;
1833 var = var_lookup (name, vc);
1836 return ((SHELL_VAR *)NULL);
1838 return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
1841 /* Look up and resolve the chain of nameref variables starting at V all the
1842 way to NULL or non-nameref. */
1844 find_variable_nameref (v)
1849 SHELL_VAR *orig, *oldv;
1853 while (v && nameref_p (v))
1856 if (level > NAMEREF_MAX)
1857 return ((SHELL_VAR *)0); /* error message here? */
1858 newname = nameref_cell (v);
1859 if (newname == 0 || *newname == '\0')
1860 return ((SHELL_VAR *)0);
1862 v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
1863 if (v == orig || v == oldv)
1865 internal_warning (_("%s: circular name reference"), orig->name);
1866 return ((SHELL_VAR *)0);
1872 /* Resolve the chain of nameref variables for NAME. XXX - could change later */
1874 find_variable_last_nameref (name)
1881 nv = v = find_variable_noref (name);
1883 while (v && nameref_p (v))
1886 if (level > NAMEREF_MAX)
1887 return ((SHELL_VAR *)0); /* error message here? */
1888 newname = nameref_cell (v);
1889 if (newname == 0 || *newname == '\0')
1890 return ((SHELL_VAR *)0);
1892 v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
1897 /* Resolve the chain of nameref variables for NAME. XXX - could change later */
1899 find_global_variable_last_nameref (name)
1906 nv = v = find_global_variable_noref (name);
1908 while (v && nameref_p (v))
1911 if (level > NAMEREF_MAX)
1912 return ((SHELL_VAR *)0); /* error message here? */
1913 newname = nameref_cell (v);
1914 if (newname == 0 || *newname == '\0')
1915 return ((SHELL_VAR *)0);
1917 v = find_global_variable_noref (newname);
1923 find_nameref_at_context (v, vc)
1927 SHELL_VAR *nv, *nv2;
1934 while (nv && nameref_p (nv))
1937 if (level > NAMEREF_MAX)
1938 return ((SHELL_VAR *)NULL);
1939 newname = nameref_cell (nv);
1940 if (newname == 0 || *newname == '\0')
1941 return ((SHELL_VAR *)NULL);
1942 nv2 = hash_lookup (newname, vc->table);
1950 /* Do nameref resolution from the VC, which is the local context for some
1951 function or builtin, `up' the chain to the global variables context. If
1952 NVCP is not NULL, return the variable context where we finally ended the
1953 nameref resolution (so the bind_variable_internal can use the correct
1954 variable context and hash table). */
1956 find_variable_nameref_context (v, vc, nvcp)
1961 SHELL_VAR *nv, *nv2;
1964 /* Look starting at the current context all the way `up' */
1965 for (nv = v, nvc = vc; nvc; nvc = nvc->down)
1967 nv2 = find_nameref_at_context (nv, nvc);
1973 if (nameref_p (nv) == 0)
1976 return (nameref_p (nv) ? (SHELL_VAR *)NULL : nv);
1979 /* Do nameref resolution from the VC, which is the local context for some
1980 function or builtin, `up' the chain to the global variables context. If
1981 NVCP is not NULL, return the variable context where we finally ended the
1982 nameref resolution (so the bind_variable_internal can use the correct
1983 variable context and hash table). */
1985 find_variable_last_nameref_context (v, vc, nvcp)
1990 SHELL_VAR *nv, *nv2;
1993 /* Look starting at the current context all the way `up' */
1994 for (nv = v, nvc = vc; nvc; nvc = nvc->down)
1996 nv2 = find_nameref_at_context (nv, nvc);
2003 return (nameref_p (nv) ? nv : (SHELL_VAR *)NULL);
2006 /* Find a variable, forcing a search of the temporary environment first */
2008 find_variable_tempenv (name)
2013 var = find_variable_internal (name, 1);
2014 if (var && nameref_p (var))
2015 var = find_variable_nameref (var);
2019 /* Find a variable, not forcing a search of the temporary environment first */
2021 find_variable_notempenv (name)
2026 var = find_variable_internal (name, 0);
2027 if (var && nameref_p (var))
2028 var = find_variable_nameref (var);
2033 find_global_variable (name)
2038 var = var_lookup (name, global_variables);
2039 if (var && nameref_p (var))
2040 var = find_variable_nameref (var);
2043 return ((SHELL_VAR *)NULL);
2045 return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
2049 find_global_variable_noref (name)
2054 var = var_lookup (name, global_variables);
2057 return ((SHELL_VAR *)NULL);
2059 return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
2063 find_shell_variable (name)
2068 var = var_lookup (name, shell_variables);
2069 if (var && nameref_p (var))
2070 var = find_variable_nameref (var);
2073 return ((SHELL_VAR *)NULL);
2075 return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
2078 /* Look up the variable entry named NAME. Returns the entry or NULL. */
2080 find_variable (name)
2085 last_table_searched = 0;
2086 v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
2087 if (v && nameref_p (v))
2088 v = find_variable_nameref (v);
2093 find_variable_noref (name)
2098 v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
2102 /* Look up the function entry whose name matches STRING.
2103 Returns the entry or NULL. */
2105 find_function (name)
2108 return (hash_lookup (name, shell_functions));
2111 /* Find the function definition for the shell function named NAME. Returns
2112 the entry or NULL. */
2114 find_function_def (name)
2117 #if defined (DEBUGGER)
2118 return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs));
2120 return ((FUNCTION_DEF *)0);
2124 /* Return the value of VAR. VAR is assumed to have been the result of a
2125 lookup without any subscript, if arrays are compiled into the shell. */
2127 get_variable_value (var)
2131 return ((char *)NULL);
2132 #if defined (ARRAY_VARS)
2133 else if (array_p (var))
2134 return (array_reference (array_cell (var), 0));
2135 else if (assoc_p (var))
2136 return (assoc_reference (assoc_cell (var), "0"));
2139 return (value_cell (var));
2142 /* Return the string value of a variable. Return NULL if the variable
2143 doesn't exist. Don't cons a new string. This is a potential memory
2144 leak if the variable is found in the temporary environment. Since
2145 functions and variables have separate name spaces, returns NULL if
2146 var_name is a shell function only. */
2148 get_string_value (var_name)
2149 const char *var_name;
2153 var = find_variable (var_name);
2154 return ((var) ? get_variable_value (var) : (char *)NULL);
2157 /* This is present for use by the tilde and readline libraries. */
2159 sh_get_env_value (v)
2162 return get_string_value (v);
2165 /* **************************************************************** */
2167 /* Creating and setting variables */
2169 /* **************************************************************** */
2171 /* Set NAME to VALUE if NAME has no value. */
2173 set_if_not (name, value)
2178 if (shell_variables == 0)
2179 create_variable_tables ();
2181 v = find_variable (name);
2183 v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0);
2187 /* Create a local variable referenced by NAME. */
2189 make_local_variable (name)
2192 SHELL_VAR *new_var, *old_var;
2197 /* local foo; local foo; is a no-op. */
2198 old_var = find_variable (name);
2199 if (old_var && local_p (old_var) && old_var->context == variable_context)
2201 VUNSETATTR (old_var, att_invisible); /* XXX */
2205 was_tmpvar = old_var && tempvar_p (old_var);
2206 /* If we're making a local variable in a shell function, the temporary env
2207 has already been merged into the function's variable context stack. We
2208 can assume that a temporary var in the same context appears in the same
2209 VAR_CONTEXT and can safely be returned without creating a new variable
2210 (which results in duplicate names in the same VAR_CONTEXT->table */
2211 /* We can't just test tmpvar_p because variables in the temporary env given
2212 to a shell function appear in the function's local variable VAR_CONTEXT
2213 but retain their tempvar attribute. We want temporary variables that are
2214 found in temporary_env, hence the test for last_table_searched, which is
2215 set in hash_lookup and only (so far) checked here. */
2216 if (was_tmpvar && old_var->context == variable_context && last_table_searched != temporary_env)
2218 VUNSETATTR (old_var, att_invisible);
2222 tmp_value = value_cell (old_var);
2224 for (vc = shell_variables; vc; vc = vc->down)
2225 if (vc_isfuncenv (vc) && vc->scope == variable_context)
2230 internal_error (_("make_local_variable: no function context at current scope"));
2231 return ((SHELL_VAR *)NULL);
2233 else if (vc->table == 0)
2234 vc->table = hash_create (TEMPENV_HASH_BUCKETS);
2236 /* Since this is called only from the local/declare/typeset code, we can
2237 call builtin_error here without worry (of course, it will also work
2238 for anything that sets this_command_name). Variables with the `noassign'
2239 attribute may not be made local. The test against old_var's context
2240 level is to disallow local copies of readonly global variables (since I
2241 believe that this could be a security hole). Readonly copies of calling
2242 function local variables are OK. */
2243 if (old_var && (noassign_p (old_var) ||
2244 (readonly_p (old_var) && old_var->context == 0)))
2246 if (readonly_p (old_var))
2248 else if (noassign_p (old_var))
2249 builtin_error (_("%s: variable may not be assigned value"), name);
2251 /* Let noassign variables through with a warning */
2252 if (readonly_p (old_var))
2254 return ((SHELL_VAR *)NULL);
2258 new_var = make_new_variable (name, vc->table);
2261 new_var = make_new_variable (name, vc->table);
2263 /* If we found this variable in one of the temporary environments,
2264 inherit its value. Watch to see if this causes problems with
2265 things like `x=4 local x'. XXX - see above for temporary env
2266 variables with the same context level as variable_context */
2267 /* XXX - we should only do this if the variable is not an array. */
2269 var_setvalue (new_var, savestring (tmp_value));
2271 new_var->attributes = exported_p (old_var) ? att_exported : 0;
2274 vc->flags |= VC_HASLOCAL;
2276 new_var->context = variable_context;
2277 VSETATTR (new_var, att_local);
2282 if (was_tmpvar == 0)
2283 VSETATTR (new_var, att_invisible); /* XXX */
2287 /* Create a new shell variable with name NAME. */
2289 new_shell_variable (name)
2294 entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
2296 entry->name = savestring (name);
2297 var_setvalue (entry, (char *)NULL);
2298 CLEAR_EXPORTSTR (entry);
2300 entry->dynamic_value = (sh_var_value_func_t *)NULL;
2301 entry->assign_func = (sh_var_assign_func_t *)NULL;
2303 entry->attributes = 0;
2305 /* Always assume variables are to be made at toplevel!
2306 make_local_variable has the responsibility of changing the
2307 variable context. */
2313 /* Create a new shell variable with name NAME and add it to the hash table
2316 make_new_variable (name, table)
2321 BUCKET_CONTENTS *elt;
2323 entry = new_shell_variable (name);
2325 /* Make sure we have a shell_variables hash table to add to. */
2326 if (shell_variables == 0)
2327 create_variable_tables ();
2329 elt = hash_insert (savestring (name), table, HASH_NOSRCH);
2330 elt->data = (PTR_T)entry;
2335 #if defined (ARRAY_VARS)
2337 make_new_array_variable (name)
2343 entry = make_new_variable (name, global_variables->table);
2344 array = array_create ();
2346 var_setarray (entry, array);
2347 VSETATTR (entry, att_array);
2352 make_local_array_variable (name, assoc_ok)
2359 var = make_local_variable (name);
2360 if (var == 0 || array_p (var) || (assoc_ok && assoc_p (var)))
2363 array = array_create ();
2365 dispose_variable_value (var);
2366 var_setarray (var, array);
2367 VSETATTR (var, att_array);
2372 make_new_assoc_variable (name)
2378 entry = make_new_variable (name, global_variables->table);
2379 hash = assoc_create (0);
2381 var_setassoc (entry, hash);
2382 VSETATTR (entry, att_assoc);
2387 make_local_assoc_variable (name)
2393 var = make_local_variable (name);
2394 if (var == 0 || assoc_p (var))
2397 dispose_variable_value (var);
2398 hash = assoc_create (0);
2400 var_setassoc (var, hash);
2401 VSETATTR (var, att_assoc);
2407 make_variable_value (var, value, flags)
2412 char *retval, *oval;
2413 intmax_t lval, rval;
2414 int expok, olen, op;
2416 /* If this variable has had its type set to integer (via `declare -i'),
2417 then do expression evaluation on it and store the result. The
2418 functions in expr.c (evalexp()) and bind_int_variable() are responsible
2419 for turning off the integer flag if they don't want further
2421 if (integer_p (var))
2423 if (flags & ASS_APPEND)
2425 oval = value_cell (var);
2426 lval = evalexp (oval, &expok); /* ksh93 seems to do this */
2429 top_level_cleanup ();
2430 jump_to_top_level (DISCARD);
2433 rval = evalexp (value, &expok);
2436 top_level_cleanup ();
2437 jump_to_top_level (DISCARD);
2439 /* This can be fooled if the variable's value changes while evaluating
2440 `rval'. We can change it if we move the evaluation of lval to here. */
2441 if (flags & ASS_APPEND)
2443 retval = itos (rval);
2445 #if defined (CASEMOD_ATTRS)
2446 else if (capcase_p (var) || uppercase_p (var) || lowercase_p (var))
2448 if (flags & ASS_APPEND)
2450 oval = get_variable_value (var);
2451 if (oval == 0) /* paranoia */
2453 olen = STRLEN (oval);
2454 retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
2455 strcpy (retval, oval);
2457 strcpy (retval+olen, value);
2460 retval = savestring (value);
2463 retval = (char *)xmalloc (1);
2466 op = capcase_p (var) ? CASE_CAPITALIZE
2467 : (uppercase_p (var) ? CASE_UPPER : CASE_LOWER);
2468 oval = sh_modcase (retval, (char *)0, op);
2472 #endif /* CASEMOD_ATTRS */
2475 if (flags & ASS_APPEND)
2477 oval = get_variable_value (var);
2478 if (oval == 0) /* paranoia */
2480 olen = STRLEN (oval);
2481 retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
2482 strcpy (retval, oval);
2484 strcpy (retval+olen, value);
2487 retval = savestring (value);
2490 retval = (char *)xmalloc (1);
2495 retval = (char *)NULL;
2500 /* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the
2501 temporary environment (but usually is not). */
2503 bind_variable_internal (name, value, table, hflags, aflags)
2512 entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table);
2513 /* Follow the nameref chain here if this is the global variables table */
2514 if (entry && nameref_p (entry) && (invisible_p (entry) == 0) && table == global_variables->table)
2516 entry = find_global_variable (entry->name);
2517 /* Let's see if we have a nameref referencing a variable that hasn't yet
2520 entry = find_variable_last_nameref (name); /* XXX */
2521 if (entry == 0) /* just in case */
2525 /* The first clause handles `declare -n ref; ref=x;' */
2526 if (entry && invisible_p (entry) && nameref_p (entry))
2528 else if (entry && nameref_p (entry))
2530 newval = nameref_cell (entry);
2531 #if defined (ARRAY_VARS)
2532 /* declare -n foo=x[2] */
2533 if (valid_array_reference (newval))
2534 /* XXX - should it be aflags? */
2535 entry = assign_array_element (newval, make_variable_value (entry, value, 0), aflags);
2539 entry = make_new_variable (newval, table);
2540 var_setvalue (entry, make_variable_value (entry, value, 0));
2543 else if (entry == 0)
2545 entry = make_new_variable (name, table);
2546 var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */
2548 else if (entry->assign_func) /* array vars have assign functions now */
2550 INVALIDATE_EXPORTSTR (entry);
2551 newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value;
2552 if (assoc_p (entry))
2553 entry = (*(entry->assign_func)) (entry, newval, -1, savestring ("0"));
2554 else if (array_p (entry))
2555 entry = (*(entry->assign_func)) (entry, newval, 0, 0);
2557 entry = (*(entry->assign_func)) (entry, newval, -1, 0);
2558 if (newval != value)
2565 if (readonly_p (entry) || noassign_p (entry))
2567 if (readonly_p (entry))
2568 err_readonly (name);
2572 /* Variables which are bound are visible. */
2573 VUNSETATTR (entry, att_invisible);
2575 #if defined (ARRAY_VARS)
2576 if (assoc_p (entry) || array_p (entry))
2577 newval = make_array_variable_value (entry, 0, "0", value, aflags);
2581 newval = make_variable_value (entry, value, aflags); /* XXX */
2583 /* Invalidate any cached export string */
2584 INVALIDATE_EXPORTSTR (entry);
2586 #if defined (ARRAY_VARS)
2587 /* XXX -- this bears looking at again -- XXX */
2588 /* If an existing array variable x is being assigned to with x=b or
2589 `read x' or something of that nature, silently convert it to
2590 x[0]=b or `read x[0]'. */
2591 if (assoc_p (entry))
2593 assoc_insert (assoc_cell (entry), savestring ("0"), newval);
2596 else if (array_p (entry))
2598 array_insert (array_cell (entry), 0, newval);
2604 FREE (value_cell (entry));
2605 var_setvalue (entry, newval);
2609 if (mark_modified_vars)
2610 VSETATTR (entry, att_exported);
2612 if (exported_p (entry))
2613 array_needs_making = 1;
2618 /* Bind a variable NAME to VALUE. This conses up the name
2619 and value strings. If we have a temporary environment, we bind there
2620 first, then we bind into shell_variables. */
2623 bind_variable (name, value, flags)
2629 VAR_CONTEXT *vc, *nvc;
2632 if (shell_variables == 0)
2633 create_variable_tables ();
2635 /* If we have a temporary environment, look there first for the variable,
2636 and, if found, modify the value there before modifying it in the
2637 shell_variables table. This allows sourced scripts to modify values
2638 given to them in a temporary environment while modifying the variable
2639 value that the caller sees. */
2641 bind_tempenv_variable (name, value);
2643 /* XXX -- handle local variables here. */
2644 for (vc = shell_variables; vc; vc = vc->down)
2646 if (vc_isfuncenv (vc) || vc_isbltnenv (vc))
2648 v = hash_lookup (name, vc->table);
2650 if (v && nameref_p (v))
2652 nv = find_variable_nameref_context (v, vc, &nvc);
2655 nv = find_variable_last_nameref_context (v, vc, &nvc);
2656 if (nv && nameref_p (nv))
2658 /* If this nameref variable doesn't have a value yet,
2659 set the value. Otherwise, assign using the value as
2661 if (nameref_cell (nv) == 0)
2662 return (bind_variable_internal (nv->name, value, nvc->table, 0, flags));
2663 return (bind_variable_internal (nameref_cell (nv), value, nvc->table, 0, flags));
2672 return (bind_variable_internal (v->name, value, nvc->table, 0, flags));
2675 /* bind_variable_internal will handle nameref resolution in this case */
2676 return (bind_variable_internal (name, value, global_variables->table, 0, flags));
2680 bind_global_variable (name, value, flags)
2686 VAR_CONTEXT *vc, *nvc;
2689 if (shell_variables == 0)
2690 create_variable_tables ();
2692 /* bind_variable_internal will handle nameref resolution in this case */
2693 return (bind_variable_internal (name, value, global_variables->table, 0, flags));
2696 /* Make VAR, a simple shell variable, have value VALUE. Once assigned a
2697 value, variables are no longer invisible. This is a duplicate of part
2698 of the internals of bind_variable. If the variable is exported, or
2699 all modified variables should be exported, mark the variable for export
2700 and note that the export environment needs to be recreated. */
2702 bind_variable_value (var, value, aflags)
2710 invis = invisible_p (var);
2711 VUNSETATTR (var, att_invisible);
2713 if (var->assign_func)
2715 /* If we're appending, we need the old value, so use
2716 make_variable_value */
2717 t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value;
2718 (*(var->assign_func)) (var, t, -1, 0);
2719 if (t != value && t)
2724 t = make_variable_value (var, value, aflags);
2725 #if defined (ARRAY_VARS)
2726 if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || (legal_identifier (t) == 0 && valid_array_reference (t) == 0)))
2728 if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || legal_identifier (t) == 0))
2733 VSETATTR (var, att_invisible); /* XXX */
2734 return ((SHELL_VAR *)NULL);
2736 FREE (value_cell (var));
2737 var_setvalue (var, t);
2740 INVALIDATE_EXPORTSTR (var);
2742 if (mark_modified_vars)
2743 VSETATTR (var, att_exported);
2745 if (exported_p (var))
2746 array_needs_making = 1;
2751 /* Bind/create a shell variable with the name LHS to the RHS.
2752 This creates or modifies a variable such that it is an integer.
2754 This used to be in expr.c, but it is here so that all of the
2755 variable binding stuff is localized. Since we don't want any
2756 recursive evaluation from bind_variable() (possible without this code,
2757 since bind_variable() calls the evaluator for variables with the integer
2758 attribute set), we temporarily turn off the integer attribute for each
2759 variable we set here, then turn it back on after binding as necessary. */
2762 bind_int_variable (lhs, rhs)
2765 register SHELL_VAR *v;
2766 int isint, isarr, implicitarray;
2768 isint = isarr = implicitarray = 0;
2769 #if defined (ARRAY_VARS)
2770 if (valid_array_reference (lhs))
2773 v = array_variable_part (lhs, (char **)0, (int *)0);
2777 v = find_variable (lhs);
2781 isint = integer_p (v);
2782 VUNSETATTR (v, att_integer);
2783 #if defined (ARRAY_VARS)
2784 if (array_p (v) && isarr == 0)
2789 #if defined (ARRAY_VARS)
2791 v = assign_array_element (lhs, rhs, 0);
2792 else if (implicitarray)
2793 v = bind_array_variable (lhs, 0, rhs, 0);
2796 v = bind_variable (lhs, rhs, 0);
2799 VSETATTR (v, att_integer);
2801 VUNSETATTR (v, att_invisible);
2807 bind_var_to_int (var, val)
2811 char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p;
2813 p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0);
2814 return (bind_int_variable (var, p));
2817 /* Do a function binding to a variable. You pass the name and
2818 the command to bind to. This conses the name and command. */
2820 bind_function (name, value)
2826 entry = find_function (name);
2829 BUCKET_CONTENTS *elt;
2831 elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH);
2832 entry = new_shell_variable (name);
2833 elt->data = (PTR_T)entry;
2836 INVALIDATE_EXPORTSTR (entry);
2838 if (var_isset (entry))
2839 dispose_command (function_cell (entry));
2842 var_setfunc (entry, copy_command (value));
2844 var_setfunc (entry, 0);
2846 VSETATTR (entry, att_function);
2848 if (mark_modified_vars)
2849 VSETATTR (entry, att_exported);
2851 VUNSETATTR (entry, att_invisible); /* Just to be sure */
2853 if (exported_p (entry))
2854 array_needs_making = 1;
2856 #if defined (PROGRAMMABLE_COMPLETION)
2857 set_itemlist_dirty (&it_functions);
2863 #if defined (DEBUGGER)
2864 /* Bind a function definition, which includes source file and line number
2865 information in addition to the command, into the FUNCTION_DEF hash table.*/
2867 bind_function_def (name, value)
2869 FUNCTION_DEF *value;
2871 FUNCTION_DEF *entry;
2872 BUCKET_CONTENTS *elt;
2875 entry = find_function_def (name);
2878 dispose_function_def_contents (entry);
2879 entry = copy_function_def_contents (value, entry);
2883 cmd = value->command;
2885 entry = copy_function_def (value);
2886 value->command = cmd;
2888 elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH);
2889 elt->data = (PTR_T *)entry;
2892 #endif /* DEBUGGER */
2894 /* Add STRING, which is of the form foo=bar, to the temporary environment
2895 HASH_TABLE (temporary_env). The functions in execute_cmd.c are
2896 responsible for moving the main temporary env to one of the other
2897 temporary environments. The expansion code in subst.c calls this. */
2899 assign_in_env (word, flags)
2904 char *name, *temp, *value;
2908 string = word->word;
2911 offset = assignment (string, 0);
2912 name = savestring (string);
2913 value = (char *)NULL;
2915 if (name[offset] == '=')
2919 /* don't ignore the `+' when assigning temporary environment */
2920 if (name[offset - 1] == '+')
2922 name[offset - 1] = '\0';
2923 aflags |= ASS_APPEND;
2926 var = find_variable (name);
2927 if (var && (readonly_p (var) || noassign_p (var)))
2929 if (readonly_p (var))
2930 err_readonly (name);
2935 temp = name + offset + 1;
2936 value = expand_assignment_string_to_string (temp, 0);
2938 if (var && (aflags & ASS_APPEND))
2940 temp = make_variable_value (var, value, aflags);
2946 if (temporary_env == 0)
2947 temporary_env = hash_create (TEMPENV_HASH_BUCKETS);
2949 var = hash_lookup (name, temporary_env);
2951 var = make_new_variable (name, temporary_env);
2953 FREE (value_cell (var));
2957 value = (char *)xmalloc (1); /* like do_assignment_internal */
2961 var_setvalue (var, value);
2962 var->attributes |= (att_exported|att_tempvar);
2963 var->context = variable_context; /* XXX */
2965 INVALIDATE_EXPORTSTR (var);
2966 var->exportstr = mk_env_string (name, value);
2968 array_needs_making = 1;
2971 stupidly_hack_special_variables (name);
2973 if (echo_command_at_execute)
2974 /* The Korn shell prints the `+ ' in front of assignment statements,
2976 xtrace_print_assignment (name, value, 0, 1);
2982 /* **************************************************************** */
2984 /* Copying variables */
2986 /* **************************************************************** */
2988 #ifdef INCLUDE_UNUSED
2989 /* Copy VAR to a new data structure and return that structure. */
2994 SHELL_VAR *copy = (SHELL_VAR *)NULL;
2998 copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
3000 copy->attributes = var->attributes;
3001 copy->name = savestring (var->name);
3003 if (function_p (var))
3004 var_setfunc (copy, copy_command (function_cell (var)));
3005 #if defined (ARRAY_VARS)
3006 else if (array_p (var))
3007 var_setarray (copy, array_copy (array_cell (var)));
3008 else if (assoc_p (var))
3009 var_setassoc (copy, assoc_copy (assoc_cell (var)));
3011 else if (nameref_cell (var)) /* XXX - nameref */
3012 var_setref (copy, savestring (nameref_cell (var)));
3013 else if (value_cell (var)) /* XXX - nameref */
3014 var_setvalue (copy, savestring (value_cell (var)));
3016 var_setvalue (copy, (char *)NULL);
3018 copy->dynamic_value = var->dynamic_value;
3019 copy->assign_func = var->assign_func;
3021 copy->exportstr = COPY_EXPORTSTR (var);
3023 copy->context = var->context;
3029 /* **************************************************************** */
3031 /* Deleting and unsetting variables */
3033 /* **************************************************************** */
3035 /* Dispose of the information attached to VAR. */
3037 dispose_variable_value (var)
3040 if (function_p (var))
3041 dispose_command (function_cell (var));
3042 #if defined (ARRAY_VARS)
3043 else if (array_p (var))
3044 array_dispose (array_cell (var));
3045 else if (assoc_p (var))
3046 assoc_dispose (assoc_cell (var));
3048 else if (nameref_p (var))
3049 FREE (nameref_cell (var));
3051 FREE (value_cell (var));
3055 dispose_variable (var)
3061 if (nofree_p (var) == 0)
3062 dispose_variable_value (var);
3064 FREE_EXPORTSTR (var);
3068 if (exported_p (var))
3069 array_needs_making = 1;
3074 /* Unset the shell variable referenced by NAME. Unsetting a nameref variable
3075 unsets the variable it resolves to but leaves the nameref alone. */
3077 unbind_variable (name)
3083 v = var_lookup (name, shell_variables);
3084 nv = (v && nameref_p (v)) ? find_variable_nameref (v) : (SHELL_VAR *)NULL;
3086 r = nv ? makunbound (nv->name, shell_variables) : makunbound (name, shell_variables);
3090 /* Unbind NAME, where NAME is assumed to be a nameref variable */
3092 unbind_nameref (name)
3097 v = var_lookup (name, shell_variables);
3098 if (v && nameref_p (v))
3099 return makunbound (name, shell_variables);
3103 /* Unset the shell function named NAME. */
3108 BUCKET_CONTENTS *elt;
3111 elt = hash_remove (name, shell_functions, 0);
3116 #if defined (PROGRAMMABLE_COMPLETION)
3117 set_itemlist_dirty (&it_functions);
3120 func = (SHELL_VAR *)elt->data;
3123 if (exported_p (func))
3124 array_needs_making++;
3125 dispose_variable (func);
3134 #if defined (DEBUGGER)
3136 unbind_function_def (name)
3139 BUCKET_CONTENTS *elt;
3140 FUNCTION_DEF *funcdef;
3142 elt = hash_remove (name, shell_function_defs, 0);
3147 funcdef = (FUNCTION_DEF *)elt->data;
3149 dispose_function_def (funcdef);
3156 #endif /* DEBUGGER */
3159 delete_var (name, vc)
3163 BUCKET_CONTENTS *elt;
3167 for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
3168 if (elt = hash_remove (name, v->table, 0))
3174 old_var = (SHELL_VAR *)elt->data;
3178 dispose_variable (old_var);
3182 /* Make the variable associated with NAME go away. HASH_LIST is the
3183 hash table from which this variable should be deleted (either
3184 shell_variables or shell_functions).
3185 Returns non-zero if the variable couldn't be found. */
3187 makunbound (name, vc)
3191 BUCKET_CONTENTS *elt, *new_elt;
3196 for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
3197 if (elt = hash_remove (name, v->table, 0))
3203 old_var = (SHELL_VAR *)elt->data;
3205 if (old_var && exported_p (old_var))
3206 array_needs_making++;
3208 /* If we're unsetting a local variable and we're still executing inside
3209 the function, just mark the variable as invisible. The function
3210 eventually called by pop_var_context() will clean it up later. This
3211 must be done so that if the variable is subsequently assigned a new
3212 value inside the function, the `local' attribute is still present.
3213 We also need to add it back into the correct hash table. */
3214 if (old_var && local_p (old_var) && variable_context == old_var->context)
3216 if (nofree_p (old_var))
3217 var_setvalue (old_var, (char *)NULL);
3218 #if defined (ARRAY_VARS)
3219 else if (array_p (old_var))
3220 array_dispose (array_cell (old_var));
3221 else if (assoc_p (old_var))
3222 assoc_dispose (assoc_cell (old_var));
3224 else if (nameref_p (old_var))
3225 FREE (nameref_cell (old_var));
3227 FREE (value_cell (old_var));
3228 /* Reset the attributes. Preserve the export attribute if the variable
3229 came from a temporary environment. Make sure it stays local, and
3230 make it invisible. */
3231 old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0;
3232 VSETATTR (old_var, att_local);
3233 VSETATTR (old_var, att_invisible);
3234 var_setvalue (old_var, (char *)NULL);
3235 INVALIDATE_EXPORTSTR (old_var);
3237 new_elt = hash_insert (savestring (old_var->name), v->table, 0);
3238 new_elt->data = (PTR_T)old_var;
3239 stupidly_hack_special_variables (old_var->name);
3246 /* Have to save a copy of name here, because it might refer to
3247 old_var->name. If so, stupidly_hack_special_variables will
3248 reference freed memory. */
3249 t = savestring (name);
3254 dispose_variable (old_var);
3255 stupidly_hack_special_variables (t);
3261 /* Get rid of all of the variables in the current context. */
3263 kill_all_local_variables ()
3267 for (vc = shell_variables; vc; vc = vc->down)
3268 if (vc_isfuncenv (vc) && vc->scope == variable_context)
3273 if (vc->table && vc_haslocals (vc))
3275 delete_all_variables (vc->table);
3276 hash_dispose (vc->table);
3278 vc->table = (HASH_TABLE *)NULL;
3282 free_variable_hash_data (data)
3287 var = (SHELL_VAR *)data;
3288 dispose_variable (var);
3291 /* Delete the entire contents of the hash table. */
3293 delete_all_variables (hashed_vars)
3294 HASH_TABLE *hashed_vars;
3296 hash_flush (hashed_vars, free_variable_hash_data);
3299 /* **************************************************************** */
3301 /* Setting variable attributes */
3303 /* **************************************************************** */
3305 #define FIND_OR_MAKE_VARIABLE(name, entry) \
3308 entry = find_variable (name); \
3311 entry = bind_variable (name, "", 0); \
3312 if (!no_invisible_vars && entry) entry->attributes |= att_invisible; \
3317 /* Make the variable associated with NAME be readonly.
3318 If NAME does not exist yet, create it. */
3320 set_var_read_only (name)
3325 FIND_OR_MAKE_VARIABLE (name, entry);
3326 VSETATTR (entry, att_readonly);
3329 #ifdef INCLUDE_UNUSED
3330 /* Make the function associated with NAME be readonly.
3331 If NAME does not exist, we just punt, like auto_export code below. */
3333 set_func_read_only (name)
3338 entry = find_function (name);
3340 VSETATTR (entry, att_readonly);
3343 /* Make the variable associated with NAME be auto-exported.
3344 If NAME does not exist yet, create it. */
3346 set_var_auto_export (name)
3351 FIND_OR_MAKE_VARIABLE (name, entry);
3352 set_auto_export (entry);
3355 /* Make the function associated with NAME be auto-exported. */
3357 set_func_auto_export (name)
3362 entry = find_function (name);
3364 set_auto_export (entry);
3368 /* **************************************************************** */
3370 /* Creating lists of variables */
3372 /* **************************************************************** */
3375 vlist_alloc (nentries)
3380 vlist = (VARLIST *)xmalloc (sizeof (VARLIST));
3381 vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *));
3382 vlist->list_size = nentries;
3383 vlist->list_len = 0;
3384 vlist->list[0] = (SHELL_VAR *)NULL;
3390 vlist_realloc (vlist, n)
3395 return (vlist = vlist_alloc (n));
3396 if (n > vlist->list_size)
3398 vlist->list_size = n;
3399 vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *));
3405 vlist_add (vlist, var, flags)
3412 for (i = 0; i < vlist->list_len; i++)
3413 if (STREQ (var->name, vlist->list[i]->name))
3415 if (i < vlist->list_len)
3418 if (i >= vlist->list_size)
3419 vlist = vlist_realloc (vlist, vlist->list_size + 16);
3421 vlist->list[vlist->list_len++] = var;
3422 vlist->list[vlist->list_len] = (SHELL_VAR *)NULL;
3425 /* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the
3426 variables for which FUNCTION returns a non-zero value. A NULL value
3427 for FUNCTION means to use all variables. */
3429 map_over (function, vc)
3430 sh_var_map_func_t *function;
3438 for (nentries = 0, v = vc; v; v = v->down)
3439 nentries += HASH_ENTRIES (v->table);
3442 return (SHELL_VAR **)NULL;
3444 vlist = vlist_alloc (nentries);
3446 for (v = vc; v; v = v->down)
3447 flatten (v->table, function, vlist, 0);
3455 map_over_funcs (function)
3456 sh_var_map_func_t *function;
3461 if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0)
3462 return ((SHELL_VAR **)NULL);
3464 vlist = vlist_alloc (HASH_ENTRIES (shell_functions));
3466 flatten (shell_functions, function, vlist, 0);
3473 /* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those
3474 elements for which FUNC succeeds to VLIST->list. FLAGS is reserved
3475 for future use. Only unique names are added to VLIST. If FUNC is
3476 NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is
3477 NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST
3478 and FUNC are both NULL, nothing happens. */
3480 flatten (var_hash_table, func, vlist, flags)
3481 HASH_TABLE *var_hash_table;
3482 sh_var_map_func_t *func;
3487 register BUCKET_CONTENTS *tlist;
3491 if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0))
3494 for (i = 0; i < var_hash_table->nbuckets; i++)
3496 for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next)
3498 var = (SHELL_VAR *)tlist->data;
3500 r = func ? (*func) (var) : 1;
3502 vlist_add (vlist, var, flags);
3508 sort_variables (array)
3511 qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp);
3515 qsort_var_comp (var1, var2)
3516 SHELL_VAR **var1, **var2;
3520 if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0)
3521 result = strcmp ((*var1)->name, (*var2)->name);
3526 /* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for
3527 which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
3530 sh_var_map_func_t *func;
3534 list = map_over (func, shell_variables);
3535 if (list /* && posixly_correct */)
3536 sort_variables (list);
3540 /* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for
3541 which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
3544 sh_var_map_func_t *func;
3548 list = map_over_funcs (func);
3549 if (list /* && posixly_correct */)
3550 sort_variables (list);
3554 /* Create a NULL terminated array of all the shell variables. */
3556 all_shell_variables ()
3558 return (vapply ((sh_var_map_func_t *)NULL));
3561 /* Create a NULL terminated array of all the shell functions. */
3563 all_shell_functions ()
3565 return (fapply ((sh_var_map_func_t *)NULL));
3572 return (invisible_p (var) == 0);
3576 all_visible_functions ()
3578 return (fapply (visible_var));
3582 all_visible_variables ()
3584 return (vapply (visible_var));
3587 /* Return non-zero if the variable VAR is visible and exported. Array
3588 variables cannot be exported. */
3590 visible_and_exported (var)
3593 return (invisible_p (var) == 0 && exported_p (var));
3596 /* Candidate variables for the export environment are either valid variables
3597 with the export attribute or invalid variables inherited from the initial
3598 environment and simply passed through. */
3600 export_environment_candidate (var)
3603 return (exported_p (var) && (invisible_p (var) == 0 || imported_p (var)));
3606 /* Return non-zero if VAR is a local variable in the current context and
3609 local_and_exported (var)
3612 return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var));
3616 all_exported_variables ()
3618 return (vapply (visible_and_exported));
3622 local_exported_variables ()
3624 return (vapply (local_and_exported));
3628 variable_in_context (var)
3631 return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context);
3635 all_local_variables ()
3641 vc = shell_variables;
3642 for (vc = shell_variables; vc; vc = vc->down)
3643 if (vc_isfuncenv (vc) && vc->scope == variable_context)
3648 internal_error (_("all_local_variables: no function context at current scope"));
3649 return (SHELL_VAR **)NULL;
3651 if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0)
3652 return (SHELL_VAR **)NULL;
3654 vlist = vlist_alloc (HASH_ENTRIES (vc->table));
3656 flatten (vc->table, variable_in_context, vlist, 0);
3661 sort_variables (ret);
3665 #if defined (ARRAY_VARS)
3666 /* Return non-zero if the variable VAR is visible and an array. */
3668 visible_array_vars (var)
3671 return (invisible_p (var) == 0 && array_p (var));
3675 all_array_variables ()
3677 return (vapply (visible_array_vars));
3679 #endif /* ARRAY_VARS */
3682 all_variables_matching_prefix (prefix)
3685 SHELL_VAR **varlist;
3687 int vind, rind, plen;
3689 plen = STRLEN (prefix);
3690 varlist = all_visible_variables ();
3691 for (vind = 0; varlist && varlist[vind]; vind++)
3693 if (varlist == 0 || vind == 0)
3694 return ((char **)NULL);
3695 rlist = strvec_create (vind + 1);
3696 for (vind = rind = 0; varlist[vind]; vind++)
3698 if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen))
3699 rlist[rind++] = savestring (varlist[vind]->name);
3701 rlist[rind] = (char *)0;
3707 /* **************************************************************** */
3709 /* Managing temporary variable scopes */
3711 /* **************************************************************** */
3713 /* Make variable NAME have VALUE in the temporary environment. */
3715 bind_tempenv_variable (name, value)
3721 var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL;
3725 FREE (value_cell (var));
3726 var_setvalue (var, savestring (value));
3727 INVALIDATE_EXPORTSTR (var);
3733 /* Find a variable in the temporary environment that is named NAME.
3734 Return the SHELL_VAR *, or NULL if not found. */
3736 find_tempenv_variable (name)
3739 return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL);
3742 char **tempvar_list;
3745 /* Push the variable described by (SHELL_VAR *)DATA down to the next
3746 variable context from the temporary environment. */
3748 push_temp_var (data)
3752 HASH_TABLE *binding_table;
3754 var = (SHELL_VAR *)data;
3756 binding_table = shell_variables->table;
3757 if (binding_table == 0)
3759 if (shell_variables == global_variables)
3760 /* shouldn't happen */
3761 binding_table = shell_variables->table = global_variables->table = hash_create (0);
3763 binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS);
3766 v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0);
3768 /* XXX - should we set the context here? It shouldn't matter because of how
3769 assign_in_env works, but might want to check. */
3770 if (binding_table == global_variables->table) /* XXX */
3771 var->attributes &= ~(att_tempvar|att_propagate);
3774 var->attributes |= att_propagate;
3775 if (binding_table == shell_variables->table)
3776 shell_variables->flags |= VC_HASTMPVAR;
3778 v->attributes |= var->attributes;
3780 if (find_special_var (var->name) >= 0)
3781 tempvar_list[tvlist_ind++] = savestring (var->name);
3783 dispose_variable (var);
3787 propagate_temp_var (data)
3792 var = (SHELL_VAR *)data;
3793 if (tempvar_p (var) && (var->attributes & att_propagate))
3794 push_temp_var (data);
3797 if (find_special_var (var->name) >= 0)
3798 tempvar_list[tvlist_ind++] = savestring (var->name);
3799 dispose_variable (var);
3803 /* Free the storage used in the hash table for temporary
3804 environment variables. PUSHF is a function to be called
3805 to free each hash table entry. It takes care of pushing variables
3806 to previous scopes if appropriate. PUSHF stores names of variables
3807 that require special handling (e.g., IFS) on tempvar_list, so this
3808 function can call stupidly_hack_special_variables on all the
3809 variables in the list when the temporary hash table is destroyed. */
3811 dispose_temporary_env (pushf)
3812 sh_free_func_t *pushf;
3816 tempvar_list = strvec_create (HASH_ENTRIES (temporary_env) + 1);
3817 tempvar_list[tvlist_ind = 0] = 0;
3819 hash_flush (temporary_env, pushf);
3820 hash_dispose (temporary_env);
3821 temporary_env = (HASH_TABLE *)NULL;
3823 tempvar_list[tvlist_ind] = 0;
3825 array_needs_making = 1;
3828 sv_ifs ("IFS"); /* XXX here for now -- check setifs in assign_in_env */
3830 for (i = 0; i < tvlist_ind; i++)
3831 stupidly_hack_special_variables (tempvar_list[i]);
3833 strvec_dispose (tempvar_list);
3839 dispose_used_env_vars ()
3843 dispose_temporary_env (propagate_temp_var);
3844 maybe_make_export_env ();
3848 /* Take all of the shell variables in the temporary environment HASH_TABLE
3849 and make shell variables from them at the current variable context. */
3851 merge_temporary_env ()
3854 dispose_temporary_env (push_temp_var);
3857 /* **************************************************************** */
3859 /* Creating and manipulating the environment */
3861 /* **************************************************************** */
3863 static inline char *
3864 mk_env_string (name, value)
3865 const char *name, *value;
3867 int name_len, value_len;
3870 name_len = strlen (name);
3871 value_len = STRLEN (value);
3872 p = (char *)xmalloc (2 + name_len + value_len);
3875 if (value && *value)
3876 strcpy (p + name_len + 1, value);
3878 p[name_len + 1] = '\0';
3893 internal_error (_("%s has null exportstr"), v->name);
3896 if (legal_variable_starter ((unsigned char)*s) == 0)
3898 internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
3901 for (s = v->exportstr + 1; s && *s; s++)
3905 if (legal_variable_char ((unsigned char)*s) == 0)
3907 internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
3913 internal_error (_("no `=' in exportstr for %s"), v->name);
3921 make_env_array_from_var_list (vars)
3924 register int i, list_index;
3925 register SHELL_VAR *var;
3926 char **list, *value;
3928 list = strvec_create ((1 + strvec_len ((char **)vars)));
3930 #define USE_EXPORTSTR (value == var->exportstr)
3932 for (i = 0, list_index = 0; var = vars[i]; i++)
3934 #if defined (__CYGWIN__)
3935 /* We don't use the exportstr stuff on Cygwin at all. */
3936 INVALIDATE_EXPORTSTR (var);
3939 value = var->exportstr;
3940 else if (function_p (var))
3941 value = named_function_string ((char *)NULL, function_cell (var), 0);
3942 #if defined (ARRAY_VARS)
3943 else if (array_p (var))
3945 value = array_to_assignment_string (array_cell (var));
3947 continue; /* XXX array vars cannot yet be exported */
3948 # endif /* ARRAY_EXPORT */
3949 else if (assoc_p (var))
3951 value = assoc_to_assignment_string (assoc_cell (var));
3953 continue; /* XXX associative array vars cannot yet be exported */
3957 value = value_cell (var);
3961 /* Gee, I'd like to get away with not using savestring() if we're
3962 using the cached exportstr... */
3963 list[list_index] = USE_EXPORTSTR ? savestring (value)
3964 : mk_env_string (var->name, value);
3966 if (USE_EXPORTSTR == 0)
3967 SAVE_EXPORTSTR (var, list[list_index]);
3970 #undef USE_EXPORTSTR
3973 #if defined (ARRAY_VARS)
3974 if (array_p (var) || assoc_p (var))
3981 list[list_index] = (char *)NULL;
3985 /* Make an array of assignment statements from the hash table
3986 HASHED_VARS which contains SHELL_VARs. Only visible, exported
3987 variables are eligible. */
3989 make_var_export_array (vcxt)
3996 vars = map_over (visible_and_exported, vcxt);
3998 vars = map_over (export_environment_candidate, vcxt);
4002 return (char **)NULL;
4004 list = make_env_array_from_var_list (vars);
4011 make_func_export_array ()
4016 vars = map_over_funcs (visible_and_exported);
4018 return (char **)NULL;
4020 list = make_env_array_from_var_list (vars);
4026 /* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */
4027 #define add_to_export_env(envstr,do_alloc) \
4030 if (export_env_index >= (export_env_size - 1)) \
4032 export_env_size += 16; \
4033 export_env = strvec_resize (export_env, export_env_size); \
4034 environ = export_env; \
4036 export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \
4037 export_env[export_env_index] = (char *)NULL; \
4040 /* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the
4041 array with the same left-hand side. Return the new EXPORT_ENV. */
4043 add_or_supercede_exported_var (assign, do_alloc)
4050 equal_offset = assignment (assign, 0);
4051 if (equal_offset == 0)
4052 return (export_env);
4054 /* If this is a function, then only supersede the function definition.
4055 We do this by including the `=() {' in the comparison, like
4056 initialize_shell_variables does. */
4057 if (assign[equal_offset + 1] == '(' &&
4058 strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */
4061 for (i = 0; i < export_env_index; i++)
4063 if (STREQN (assign, export_env[i], equal_offset + 1))
4065 free (export_env[i]);
4066 export_env[i] = do_alloc ? savestring (assign) : assign;
4067 return (export_env);
4070 add_to_export_env (assign, do_alloc);
4071 return (export_env);
4075 add_temp_array_to_env (temp_array, do_alloc, do_supercede)
4077 int do_alloc, do_supercede;
4081 if (temp_array == 0)
4084 for (i = 0; temp_array[i]; i++)
4087 export_env = add_or_supercede_exported_var (temp_array[i], do_alloc);
4089 add_to_export_env (temp_array[i], do_alloc);
4095 /* Make the environment array for the command about to be executed, if the
4096 array needs making. Otherwise, do nothing. If a shell action could
4097 change the array that commands receive for their environment, then the
4098 code should `array_needs_making++'.
4100 The order to add to the array is:
4102 list of var contexts whose head is shell_variables
4105 This is the shell variable lookup order. We add only new variable
4106 names at each step, which allows local variables and variables in
4107 the temporary environments to shadow variables in the global (or
4108 any previous) scope.
4112 n_shell_variables ()
4117 for (n = 0, vc = shell_variables; vc; vc = vc->down)
4118 n += HASH_ENTRIES (vc->table);
4128 v = find_variable (name);
4129 if (v && exported_p (v))
4131 array_needs_making = 1;
4132 maybe_make_export_env ();
4139 maybe_make_export_env ()
4141 register char **temp_array;
4145 if (array_needs_making)
4148 strvec_flush (export_env);
4150 /* Make a guess based on how many shell variables and functions we
4151 have. Since there will always be array variables, and array
4152 variables are not (yet) exported, this will always be big enough
4153 for the exported variables and functions. */
4154 new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 +
4155 HASH_ENTRIES (temporary_env);
4156 if (new_size > export_env_size)
4158 export_env_size = new_size;
4159 export_env = strvec_resize (export_env, export_env_size);
4160 environ = export_env;
4162 export_env[export_env_index = 0] = (char *)NULL;
4164 /* Make a dummy variable context from the temporary_env, stick it on
4165 the front of shell_variables, call make_var_export_array on the
4166 whole thing to flatten it, and convert the list of SHELL_VAR *s
4167 to the form needed by the environment. */
4170 tcxt = new_var_context ((char *)NULL, 0);
4171 tcxt->table = temporary_env;
4172 tcxt->down = shell_variables;
4175 tcxt = shell_variables;
4177 temp_array = make_var_export_array (tcxt);
4179 add_temp_array_to_env (temp_array, 0, 0);
4181 if (tcxt != shell_variables)
4184 #if defined (RESTRICTED_SHELL)
4185 /* Restricted shells may not export shell functions. */
4186 temp_array = restricted ? (char **)0 : make_func_export_array ();
4188 temp_array = make_func_export_array ();
4191 add_temp_array_to_env (temp_array, 0, 0);
4193 array_needs_making = 0;
4197 /* This is an efficiency hack. PWD and OLDPWD are auto-exported, so
4198 we will need to remake the exported environment every time we
4199 change directories. `_' is always put into the environment for
4200 every external command, so without special treatment it will always
4201 cause the environment to be remade.
4203 If there is no other reason to make the exported environment, we can
4204 just update the variables in place and mark the exported environment
4205 as no longer needing a remake. */
4207 update_export_env_inplace (env_prefix, preflen, value)
4214 evar = (char *)xmalloc (STRLEN (value) + preflen + 1);
4215 strcpy (evar, env_prefix);
4217 strcpy (evar + preflen, value);
4218 export_env = add_or_supercede_exported_var (evar, 0);
4221 /* We always put _ in the environment as the name of this command. */
4223 put_command_name_into_env (command_name)
4226 update_export_env_inplace ("_=", 2, command_name);
4229 /* **************************************************************** */
4231 /* Managing variable contexts */
4233 /* **************************************************************** */
4235 /* Allocate and return a new variable context with NAME and FLAGS.
4236 NAME can be NULL. */
4239 new_var_context (name, flags)
4245 vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT));
4246 vc->name = name ? savestring (name) : (char *)NULL;
4247 vc->scope = variable_context;
4250 vc->up = vc->down = (VAR_CONTEXT *)NULL;
4251 vc->table = (HASH_TABLE *)NULL;
4256 /* Free a variable context and its data, including the hash table. Dispose
4257 all of the variables. */
4259 dispose_var_context (vc)
4266 delete_all_variables (vc->table);
4267 hash_dispose (vc->table);
4273 /* Set VAR's scope level to the current variable context. */
4278 return (var->context = variable_context);
4281 /* Make a new variable context with NAME and FLAGS and a HASH_TABLE of
4282 temporary variables, and push it onto shell_variables. This is
4283 for shell functions. */
4285 push_var_context (name, flags, tempvars)
4288 HASH_TABLE *tempvars;
4292 vc = new_var_context (name, flags);
4293 vc->table = tempvars;
4296 /* Have to do this because the temp environment was created before
4297 variable_context was incremented. */
4298 flatten (tempvars, set_context, (VARLIST *)NULL, 0);
4299 vc->flags |= VC_HASTMPVAR;
4301 vc->down = shell_variables;
4302 shell_variables->up = vc;
4304 return (shell_variables = vc);
4308 push_func_var (data)
4313 var = (SHELL_VAR *)data;
4315 if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate)))
4317 /* Make sure we have a hash table to store the variable in while it is
4318 being propagated down to the global variables table. Create one if
4320 if ((vc_isfuncenv (shell_variables) || vc_istempenv (shell_variables)) && shell_variables->table == 0)
4321 shell_variables->table = hash_create (0);
4322 /* XXX - should we set v->context here? */
4323 v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
4324 if (shell_variables == global_variables)
4325 var->attributes &= ~(att_tempvar|att_propagate);
4327 shell_variables->flags |= VC_HASTMPVAR;
4328 v->attributes |= var->attributes;
4331 stupidly_hack_special_variables (var->name); /* XXX */
4333 dispose_variable (var);
4336 /* Pop the top context off of VCXT and dispose of it, returning the rest of
4341 VAR_CONTEXT *ret, *vcxt;
4343 vcxt = shell_variables;
4344 if (vc_isfuncenv (vcxt) == 0)
4346 internal_error (_("pop_var_context: head of shell_variables not a function context"));
4350 if (ret = vcxt->down)
4352 ret->up = (VAR_CONTEXT *)NULL;
4353 shell_variables = ret;
4355 hash_flush (vcxt->table, push_func_var);
4356 dispose_var_context (vcxt);
4359 internal_error (_("pop_var_context: no global_variables context"));
4362 /* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and
4363 all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */
4365 delete_all_contexts (vcxt)
4370 for (v = vcxt; v != global_variables; v = t)
4373 dispose_var_context (v);
4376 delete_all_variables (global_variables->table);
4377 shell_variables = global_variables;
4380 /* **************************************************************** */
4382 /* Pushing and Popping temporary variable scopes */
4384 /* **************************************************************** */
4387 push_scope (flags, tmpvars)
4389 HASH_TABLE *tmpvars;
4391 return (push_var_context ((char *)NULL, flags, tmpvars));
4395 push_exported_var (data)
4400 var = (SHELL_VAR *)data;
4402 /* If a temp var had its export attribute set, or it's marked to be
4403 propagated, bind it in the previous scope before disposing it. */
4404 /* XXX - This isn't exactly right, because all tempenv variables have the
4405 export attribute set. */
4407 if (exported_p (var) || (var->attributes & att_propagate))
4409 if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate))
4412 var->attributes &= ~att_tempvar; /* XXX */
4413 v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
4414 if (shell_variables == global_variables)
4415 var->attributes &= ~att_propagate;
4416 v->attributes |= var->attributes;
4419 stupidly_hack_special_variables (var->name); /* XXX */
4421 dispose_variable (var);
4425 pop_scope (is_special)
4428 VAR_CONTEXT *vcxt, *ret;
4430 vcxt = shell_variables;
4431 if (vc_istempscope (vcxt) == 0)
4433 internal_error (_("pop_scope: head of shell_variables not a temporary environment scope"));
4439 ret->up = (VAR_CONTEXT *)NULL;
4441 shell_variables = ret;
4443 /* Now we can take care of merging variables in VCXT into set of scopes
4444 whose head is RET (shell_variables). */
4449 hash_flush (vcxt->table, push_func_var);
4451 hash_flush (vcxt->table, push_exported_var);
4452 hash_dispose (vcxt->table);
4456 sv_ifs ("IFS"); /* XXX here for now */
4459 /* **************************************************************** */
4461 /* Pushing and Popping function contexts */
4463 /* **************************************************************** */
4465 static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL;
4466 static int dollar_arg_stack_slots;
4467 static int dollar_arg_stack_index;
4469 /* XXX - we might want to consider pushing and popping the `getopts' state
4470 when we modify the positional parameters. */
4472 push_context (name, is_subshell, tempvars)
4473 char *name; /* function name */
4475 HASH_TABLE *tempvars;
4477 if (is_subshell == 0)
4478 push_dollar_vars ();
4480 push_var_context (name, VC_FUNCENV, tempvars);
4483 /* Only called when subshell == 0, so we don't need to check, and can
4484 unconditionally pop the dollar vars off the stack. */
4492 sv_ifs ("IFS"); /* XXX here for now */
4495 /* Save the existing positional parameters on a stack. */
4499 if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots)
4501 dollar_arg_stack = (WORD_LIST **)
4502 xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10)
4503 * sizeof (WORD_LIST *));
4505 dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args ();
4506 dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
4509 /* Restore the positional parameters from our stack. */
4513 if (!dollar_arg_stack || dollar_arg_stack_index == 0)
4516 remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1);
4517 dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
4518 dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
4519 set_dollar_vars_unchanged ();
4523 dispose_saved_dollar_vars ()
4525 if (!dollar_arg_stack || dollar_arg_stack_index == 0)
4528 dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
4529 dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
4532 /* Manipulate the special BASH_ARGV and BASH_ARGC variables. */
4538 #if defined (ARRAY_VARS) && defined (DEBUGGER)
4539 SHELL_VAR *bash_argv_v, *bash_argc_v;
4540 ARRAY *bash_argv_a, *bash_argc_a;
4545 GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
4546 GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
4548 for (l = list, i = 0; l; l = l->next, i++)
4549 array_push (bash_argv_a, l->word->word);
4552 array_push (bash_argc_a, t);
4554 #endif /* ARRAY_VARS && DEBUGGER */
4557 /* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC
4558 array and use that value as the count of elements to remove from
4563 #if defined (ARRAY_VARS) && defined (DEBUGGER)
4564 SHELL_VAR *bash_argv_v, *bash_argc_v;
4565 ARRAY *bash_argv_a, *bash_argc_a;
4569 GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
4570 GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
4572 ce = array_shift (bash_argc_a, 1, 0);
4573 if (ce == 0 || legal_number (element_value (ce), &i) == 0)
4577 array_pop (bash_argv_a);
4578 array_dispose_element (ce);
4579 #endif /* ARRAY_VARS && DEBUGGER */
4582 /*************************************************
4584 * Functions to manage special variables *
4586 *************************************************/
4588 /* Extern declarations for variables this code has to manage. */
4589 extern int eof_encountered, eof_encountered_limit, ignoreeof;
4591 #if defined (READLINE)
4592 extern int hostname_list_initialized;
4595 /* An alist of name.function for each special variable. Most of the
4596 functions don't do much, and in fact, this would be faster with a
4597 switch statement, but by the end of this file, I am sick of switch
4600 #define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0
4602 /* This table will be sorted with qsort() the first time it's accessed. */
4603 struct name_and_function {
4605 sh_sv_func_t *function;
4608 static struct name_and_function special_vars[] = {
4609 { "BASH_COMPAT", sv_shcompat },
4610 { "BASH_XTRACEFD", sv_xtracefd },
4612 #if defined (JOB_CONTROL)
4613 { "CHILD_MAX", sv_childmax },
4616 #if defined (READLINE)
4617 # if defined (STRICT_POSIX)
4618 { "COLUMNS", sv_winsize },
4620 { "COMP_WORDBREAKS", sv_comp_wordbreaks },
4623 { "FUNCNEST", sv_funcnest },
4625 { "GLOBIGNORE", sv_globignore },
4627 #if defined (HISTORY)
4628 { "HISTCONTROL", sv_history_control },
4629 { "HISTFILESIZE", sv_histsize },
4630 { "HISTIGNORE", sv_histignore },
4631 { "HISTSIZE", sv_histsize },
4632 { "HISTTIMEFORMAT", sv_histtimefmt },
4635 #if defined (__CYGWIN__)
4636 { "HOME", sv_home },
4639 #if defined (READLINE)
4640 { "HOSTFILE", sv_hostfile },
4644 { "IGNOREEOF", sv_ignoreeof },
4646 { "LANG", sv_locale },
4647 { "LC_ALL", sv_locale },
4648 { "LC_COLLATE", sv_locale },
4649 { "LC_CTYPE", sv_locale },
4650 { "LC_MESSAGES", sv_locale },
4651 { "LC_NUMERIC", sv_locale },
4652 { "LC_TIME", sv_locale },
4654 #if defined (READLINE) && defined (STRICT_POSIX)
4655 { "LINES", sv_winsize },
4658 { "MAIL", sv_mail },
4659 { "MAILCHECK", sv_mail },
4660 { "MAILPATH", sv_mail },
4662 { "OPTERR", sv_opterr },
4663 { "OPTIND", sv_optind },
4665 { "PATH", sv_path },
4666 { "POSIXLY_CORRECT", sv_strict_posix },
4668 #if defined (READLINE)
4669 { "TERM", sv_terminal },
4670 { "TERMCAP", sv_terminal },
4671 { "TERMINFO", sv_terminal },
4672 #endif /* READLINE */
4674 { "TEXTDOMAIN", sv_locale },
4675 { "TEXTDOMAINDIR", sv_locale },
4677 #if defined (HAVE_TZSET)
4681 #if defined (HISTORY) && defined (BANG_HISTORY)
4682 { "histchars", sv_histchars },
4683 #endif /* HISTORY && BANG_HISTORY */
4685 { "ignoreeof", sv_ignoreeof },
4687 { (char *)0, (sh_sv_func_t *)0 }
4690 #define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1)
4693 sv_compare (sv1, sv2)
4694 struct name_and_function *sv1, *sv2;
4698 if ((r = sv1->name[0] - sv2->name[0]) == 0)
4699 r = strcmp (sv1->name, sv2->name);
4704 find_special_var (name)
4709 for (i = 0; special_vars[i].name; i++)
4711 r = special_vars[i].name[0] - name[0];
4713 r = strcmp (special_vars[i].name, name);
4717 /* Can't match any of rest of elements in sorted list. Take this out
4718 if it causes problems in certain environments. */
4724 /* The variable in NAME has just had its state changed. Check to see if it
4725 is one of the special ones where something special happens. */
4727 stupidly_hack_special_variables (name)
4730 static int sv_sorted = 0;
4733 if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */
4735 qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]),
4736 (QSFUNC *)sv_compare);
4740 i = find_special_var (name);
4742 (*(special_vars[i].function)) (name);
4745 /* Special variables that need hooks to be run when they are unset as part
4746 of shell reinitialization should have their sv_ functions run here. */
4748 reinit_special_variables ()
4750 #if defined (READLINE)
4751 sv_comp_wordbreaks ("COMP_WORDBREAKS");
4753 sv_globignore ("GLOBIGNORE");
4754 sv_opterr ("OPTERR");
4763 v = find_variable ("IFS");
4767 /* What to do just after the PATH variable has changed. */
4776 /* What to do just after one of the MAILxxxx variables has changed. NAME
4777 is the name of the variable. This is called with NAME set to one of
4778 MAIL, MAILCHECK, or MAILPATH. */
4783 /* If the time interval for checking the files has changed, then
4784 reset the mail timer. Otherwise, one of the pathname vars
4785 to the users mailbox has changed, so rebuild the array of
4787 if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */
4788 reset_mail_timer ();
4792 remember_mail_dates ();
4803 v = find_variable (name);
4806 else if (legal_number (value_cell (v), &num) == 0)
4812 /* What to do when GLOBIGNORE changes. */
4814 sv_globignore (name)
4817 if (privileged_mode == 0)
4818 setup_glob_ignore (name);
4821 #if defined (READLINE)
4823 sv_comp_wordbreaks (name)
4828 sv = find_variable (name);
4830 reset_completer_word_break_chars ();
4833 /* What to do just after one of the TERMxxx variables has changed.
4834 If we are an interactive shell, then try to reset the terminal
4835 information in readline. */
4840 if (interactive_shell && no_line_editing == 0)
4841 rl_reset_terminal (get_string_value ("TERM"));
4850 v = find_variable (name);
4852 clear_hostname_list ();
4854 hostname_list_initialized = 0;
4857 #if defined (STRICT_POSIX)
4858 /* In strict posix mode, we allow assignments to LINES and COLUMNS (and values
4859 found in the initial environment) to override the terminal size reported by
4869 if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing)
4872 v = find_variable (name);
4873 if (v == 0 || var_isnull (v))
4874 rl_reset_screen_size ();
4877 if (legal_number (value_cell (v), &xd) == 0)
4879 winsize_assignment = 1;
4880 d = xd; /* truncate */
4881 if (name[0] == 'L') /* LINES */
4882 rl_set_screen_size (d, -1);
4884 rl_set_screen_size (-1, d);
4885 winsize_assignment = 0;
4888 #endif /* STRICT_POSIX */
4889 #endif /* READLINE */
4891 /* Update the value of HOME in the export environment so tilde expansion will
4893 #if defined (__CYGWIN__)
4897 array_needs_making = 1;
4898 maybe_make_export_env ();
4902 #if defined (HISTORY)
4903 /* What to do after the HISTSIZE or HISTFILESIZE variables change.
4904 If there is a value for this HISTSIZE (and it is numeric), then stifle
4905 the history. Otherwise, if there is NO value for this variable,
4906 unstifle the history. If name is HISTFILESIZE, and its value is
4907 numeric, truncate the history file to hold no more than that many
4917 temp = get_string_value (name);
4921 if (legal_number (temp, &num))
4924 if (hmax < 0 && name[4] == 'S')
4925 unstifle_history (); /* unstifle history if HISTSIZE < 0 */
4926 else if (name[4] == 'S')
4928 stifle_history (hmax);
4929 hmax = where_history ();
4930 if (history_lines_this_session > hmax)
4931 history_lines_this_session = hmax;
4933 else if (hmax >= 0) /* truncate HISTFILE if HISTFILESIZE >= 0 */
4935 history_truncate_file (get_string_value ("HISTFILE"), hmax);
4936 if (hmax <= history_lines_in_file)
4937 history_lines_in_file = hmax;
4941 else if (name[4] == 'S')
4942 unstifle_history ();
4945 /* What to do after the HISTIGNORE variable changes. */
4947 sv_histignore (name)
4950 setup_history_ignore (name);
4953 /* What to do after the HISTCONTROL variable changes. */
4955 sv_history_control (name)
4962 history_control = 0;
4963 temp = get_string_value (name);
4965 if (temp == 0 || *temp == 0)
4969 while (val = extract_colon_unit (temp, &tptr))
4971 if (STREQ (val, "ignorespace"))
4972 history_control |= HC_IGNSPACE;
4973 else if (STREQ (val, "ignoredups"))
4974 history_control |= HC_IGNDUPS;
4975 else if (STREQ (val, "ignoreboth"))
4976 history_control |= HC_IGNBOTH;
4977 else if (STREQ (val, "erasedups"))
4978 history_control |= HC_ERASEDUPS;
4984 #if defined (BANG_HISTORY)
4985 /* Setting/unsetting of the history expansion character. */
4992 temp = get_string_value (name);
4995 history_expansion_char = *temp;
4996 if (temp[0] && temp[1])
4998 history_subst_char = temp[1];
5000 history_comment_char = temp[2];
5005 history_expansion_char = '!';
5006 history_subst_char = '^';
5007 history_comment_char = '#';
5010 #endif /* BANG_HISTORY */
5013 sv_histtimefmt (name)
5018 if (v = find_variable (name))
5020 if (history_comment_char == 0)
5021 history_comment_char = '#';
5023 history_write_timestamps = (v != 0);
5025 #endif /* HISTORY */
5027 #if defined (HAVE_TZSET)
5032 if (chkexport (name))
5037 /* If the variable exists, then the value of it can be the number
5038 of times we actually ignore the EOF. The default is small,
5039 (smaller than csh, anyway). */
5047 eof_encountered = 0;
5049 tmp_var = find_variable (name);
5050 ignoreeof = tmp_var != 0;
5051 temp = tmp_var ? value_cell (tmp_var) : (char *)NULL;
5053 eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10;
5054 set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */
5064 tt = get_string_value ("OPTIND");
5069 /* According to POSIX, setting OPTIND=1 resets the internal state
5071 if (s < 0 || s == 1)
5085 tt = get_string_value ("OPTERR");
5086 sh_opterr = (tt && *tt) ? atoi (tt) : 1;
5090 sv_strict_posix (name)
5093 SET_INT_VAR (name, posixly_correct);
5094 posix_initialize (posixly_correct);
5095 #if defined (READLINE)
5096 if (interactive_shell)
5097 posix_readline_initialize (posixly_correct);
5098 #endif /* READLINE */
5099 set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */
5109 v = get_string_value (name);
5110 if (name[0] == 'L' && name[1] == 'A') /* LANG */
5111 r = set_lang (name, v);
5113 r = set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */
5116 if (r == 0 && posixly_correct)
5117 last_command_exit_value = 1;
5121 #if defined (ARRAY_VARS)
5123 set_pipestatus_array (ps, nproc)
5131 char *t, tbuf[INT_STRLEN_BOUND(int) + 1];
5133 v = find_variable ("PIPESTATUS");
5135 v = make_new_array_variable ("PIPESTATUS");
5136 if (array_p (v) == 0)
5137 return; /* Do nothing if not an array variable. */
5140 if (a == 0 || array_num_elements (a) == 0)
5142 for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */
5144 t = inttostr (ps[i], tbuf, sizeof (tbuf));
5145 array_insert (a, i, t);
5151 if (array_num_elements (a) == nproc && nproc == 1)
5153 ae = element_forw (a->head);
5154 free (element_value (ae));
5155 ae->value = itos (ps[0]);
5157 else if (array_num_elements (a) <= nproc)
5159 /* modify in array_num_elements members in place, then add */
5161 for (i = 0; i < array_num_elements (a); i++)
5163 ae = element_forw (ae);
5164 free (element_value (ae));
5165 ae->value = itos (ps[i]);
5168 for ( ; i < nproc; i++)
5170 t = inttostr (ps[i], tbuf, sizeof (tbuf));
5171 array_insert (a, i, t);
5176 /* deleting elements. it's faster to rebuild the array. */
5178 for (i = 0; ps[i] != -1; i++)
5180 t = inttostr (ps[i], tbuf, sizeof (tbuf));
5181 array_insert (a, i, t);
5187 save_pipestatus_array ()
5192 v = find_variable ("PIPESTATUS");
5193 if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
5194 return ((ARRAY *)NULL);
5197 a2 = array_copy (array_cell (v));
5203 restore_pipestatus_array (a)
5209 v = find_variable ("PIPESTATUS");
5210 /* XXX - should we still assign even if existing value is NULL? */
5211 if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
5214 a2 = array_cell (v);
5215 var_setarray (v, a);
5222 set_pipestatus_from_exit (s)
5225 #if defined (ARRAY_VARS)
5226 static int v[2] = { 0, -1 };
5229 set_pipestatus_array (v, 1);
5242 v = find_variable (name);
5250 if (t == 0 || *t == 0)
5254 fd = (int)strtol (t, &e, 10);
5255 if (e != t && *e == '\0' && sh_validfd (fd))
5257 fp = fdopen (fd, "w");
5259 internal_error (_("%s: %s: cannot open as FILE"), name, value_cell (v));
5261 xtrace_set (fd, fp);
5264 internal_error (_("%s: %s: invalid value for trace file descriptor"), name, value_cell (v));
5268 #define MIN_COMPAT_LEVEL 31
5276 int tens, ones, compatval;
5278 v = find_variable (name);
5281 shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
5282 set_compatibility_opts ();
5285 val = value_cell (v);
5286 if (val == 0 || *val == '\0')
5288 shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
5289 set_compatibility_opts ();
5292 /* Handle decimal-like compatibility version specifications: 4.2 */
5293 if (isdigit (val[0]) && val[1] == '.' && isdigit (val[2]) && val[3] == 0)
5295 tens = val[0] - '0';
5296 ones = val[2] - '0';
5297 compatval = tens*10 + ones;
5299 /* Handle integer-like compatibility version specifications: 42 */
5300 else if (isdigit (val[0]) && isdigit (val[1]) && val[2] == 0)
5302 tens = val[0] - '0';
5303 ones = val[1] - '0';
5304 compatval = tens*10 + ones;
5309 internal_error (_("%s: %s: compatibility value out of range"), name, val);
5310 shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
5311 set_compatibility_opts ();
5315 if (compatval < MIN_COMPAT_LEVEL || compatval > DEFAULT_COMPAT_LEVEL)
5318 shell_compatibility_level = compatval;
5319 set_compatibility_opts ();
5322 #if defined (JOB_CONTROL)
5330 tt = get_string_value (name);
5331 s = (tt && *tt) ? atoi (tt) : 0;