]>
Commit | Line | Data |
---|---|---|
726f6388 JA |
1 | /* variables.c -- Functions for hacking shell variables. */ |
2 | ||
d3a24ed2 | 3 | /* Copyright (C) 1987-2003 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
bb70624e | 9 | the Free Software Foundation; either version 2, or (at your option) |
726f6388 JA |
10 | any later version. |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash; see the file COPYING. If not, write to the Free | |
bb70624e | 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 | 20 | |
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
726f6388 JA |
23 | #include "bashtypes.h" |
24 | #include "posixstat.h" | |
f73dda09 | 25 | #include "posixtime.h" |
ccc6cda3 | 26 | |
d166f048 JA |
27 | #if defined (qnx) |
28 | # include <sys/vc.h> | |
29 | #endif | |
30 | ||
ccc6cda3 JA |
31 | #if defined (HAVE_UNISTD_H) |
32 | # include <unistd.h> | |
33 | #endif | |
34 | ||
35 | #include <stdio.h> | |
f73dda09 | 36 | #include "chartypes.h" |
726f6388 | 37 | #include <pwd.h> |
726f6388 | 38 | #include "bashansi.h" |
ccc6cda3 | 39 | |
726f6388 | 40 | #include "shell.h" |
726f6388 JA |
41 | #include "flags.h" |
42 | #include "execute_cmd.h" | |
cce855bc | 43 | #include "findcmd.h" |
ccc6cda3 JA |
44 | #include "mailcheck.h" |
45 | #include "input.h" | |
f73dda09 JA |
46 | #include "hashcmd.h" |
47 | #include "pathexp.h" | |
726f6388 | 48 | |
d166f048 | 49 | #include "builtins/getopt.h" |
726f6388 | 50 | #include "builtins/common.h" |
cce855bc JA |
51 | |
52 | #if defined (READLINE) | |
53 | # include "bashline.h" | |
54 | # include <readline/readline.h> | |
55 | #else | |
56 | # include <tilde/tilde.h> | |
57 | #endif | |
726f6388 | 58 | |
ccc6cda3 JA |
59 | #if defined (HISTORY) |
60 | # include "bashhist.h" | |
cce855bc | 61 | # include <readline/history.h> |
ccc6cda3 JA |
62 | #endif /* HISTORY */ |
63 | ||
bb70624e JA |
64 | #if defined (PROGRAMMABLE_COMPLETION) |
65 | # include "pcomplete.h" | |
66 | #endif | |
67 | ||
7117c2d2 JA |
68 | #define TEMPENV_HASH_BUCKETS 4 /* must be power of two */ |
69 | ||
70 | #define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0') | |
71 | ||
726f6388 JA |
72 | /* Variables used here and defined in other files. */ |
73 | extern int posixly_correct; | |
f73dda09 | 74 | extern int line_number; |
d3a24ed2 | 75 | extern int subshell_environment, indirection_level, subshell_level; |
ccc6cda3 | 76 | extern int build_version, patch_level; |
d3a24ed2 | 77 | extern int expanding_redir; |
ccc6cda3 | 78 | extern char *dist_version, *release_status; |
726f6388 JA |
79 | extern char *shell_name; |
80 | extern char *primary_prompt, *secondary_prompt; | |
ccc6cda3 | 81 | extern char *current_host_name; |
f73dda09 | 82 | extern sh_builtin_func_t *this_shell_builtin; |
bb70624e | 83 | extern SHELL_VAR *this_shell_function; |
d3a24ed2 | 84 | extern char *the_printed_command_except_trap; |
ccc6cda3 | 85 | extern char *this_command_name; |
d3a24ed2 | 86 | extern char *command_execution_string; |
726f6388 JA |
87 | extern time_t shell_start_time; |
88 | ||
d3a24ed2 CR |
89 | #if defined (READLINE) |
90 | extern int perform_hostname_completion; | |
91 | #endif | |
92 | ||
7117c2d2 JA |
93 | /* The list of shell variables that the user has created at the global |
94 | scope, or that came from the environment. */ | |
95 | VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL; | |
96 | ||
97 | /* The current list of shell variables, including function scopes */ | |
98 | VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL; | |
726f6388 JA |
99 | |
100 | /* The list of shell functions that the user has created, or that came from | |
101 | the environment. */ | |
102 | HASH_TABLE *shell_functions = (HASH_TABLE *)NULL; | |
103 | ||
d3a24ed2 CR |
104 | #if defined (DEBUGGER) |
105 | /* The table of shell function definitions that the user defined or that | |
106 | came from the environment. */ | |
107 | HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL; | |
108 | #endif | |
109 | ||
726f6388 JA |
110 | /* The current variable context. This is really a count of how deep into |
111 | executing functions we are. */ | |
112 | int variable_context = 0; | |
113 | ||
7117c2d2 | 114 | /* The set of shell assignments which are made only in the environment |
726f6388 | 115 | for a single command. */ |
7117c2d2 | 116 | HASH_TABLE *temporary_env = (HASH_TABLE *)NULL; |
726f6388 JA |
117 | |
118 | /* Some funky variables which are known about specially. Here is where | |
119 | "$*", "$1", and all the cruft is kept. */ | |
120 | char *dollar_vars[10]; | |
121 | WORD_LIST *rest_of_args = (WORD_LIST *)NULL; | |
122 | ||
123 | /* The value of $$. */ | |
f73dda09 | 124 | pid_t dollar_dollar_pid; |
726f6388 JA |
125 | |
126 | /* An array which is passed to commands as their environment. It is | |
d166f048 | 127 | manufactured from the union of the initial environment and the |
726f6388 JA |
128 | shell variables that are marked for export. */ |
129 | char **export_env = (char **)NULL; | |
d166f048 JA |
130 | static int export_env_index; |
131 | static int export_env_size; | |
726f6388 JA |
132 | |
133 | /* Non-zero means that we have to remake EXPORT_ENV. */ | |
134 | int array_needs_making = 1; | |
135 | ||
ccc6cda3 JA |
136 | /* The number of times BASH has been executed. This is set |
137 | by initialize_variables (). */ | |
138 | int shell_level = 0; | |
726f6388 | 139 | |
726f6388 | 140 | /* Some forward declarations. */ |
f73dda09 JA |
141 | static void set_machine_vars __P((void)); |
142 | static void set_home_var __P((void)); | |
143 | static void set_shell_var __P((void)); | |
144 | static char *get_bash_name __P((void)); | |
145 | static void initialize_shell_level __P((void)); | |
146 | static void uidset __P((void)); | |
147 | #if defined (ARRAY_VARS) | |
148 | static void make_vers_array __P((void)); | |
149 | #endif | |
f73dda09 | 150 | |
7117c2d2 JA |
151 | static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t)); |
152 | #if defined (ARRAY_VARS) | |
153 | static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t)); | |
154 | #endif | |
d3a24ed2 CR |
155 | static SHELL_VAR *get_self __P((SHELL_VAR *)); |
156 | ||
157 | #if defined (ARRAY_VARS) | |
158 | static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int)); | |
159 | #endif | |
7117c2d2 JA |
160 | |
161 | static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t)); | |
162 | static SHELL_VAR *get_seconds __P((SHELL_VAR *)); | |
163 | static SHELL_VAR *init_seconds_var __P((void)); | |
164 | ||
165 | static int brand __P((void)); | |
f73dda09 | 166 | static void sbrand __P((unsigned long)); /* set bash random number generator. */ |
7117c2d2 JA |
167 | static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t)); |
168 | static SHELL_VAR *get_random __P((SHELL_VAR *)); | |
f73dda09 | 169 | |
7117c2d2 JA |
170 | static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t)); |
171 | static SHELL_VAR *get_lineno __P((SHELL_VAR *)); | |
f73dda09 | 172 | |
d3a24ed2 CR |
173 | static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t)); |
174 | static SHELL_VAR *get_subshell __P((SHELL_VAR *)); | |
175 | ||
7117c2d2 JA |
176 | #if defined (HISTORY) |
177 | static SHELL_VAR *get_histcmd __P((SHELL_VAR *)); | |
178 | #endif | |
179 | ||
180 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) | |
181 | static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t)); | |
182 | static SHELL_VAR *get_dirstack __P((SHELL_VAR *)); | |
7117c2d2 JA |
183 | #endif |
184 | ||
185 | #if defined (ARRAY_VARS) | |
186 | static SHELL_VAR *get_groupset __P((SHELL_VAR *)); | |
7117c2d2 JA |
187 | #endif |
188 | ||
189 | static SHELL_VAR *get_funcname __P((SHELL_VAR *)); | |
190 | static SHELL_VAR *init_funcname_var __P((void)); | |
191 | ||
192 | static void initialize_dynamic_variables __P((void)); | |
193 | ||
194 | static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *)); | |
f73dda09 | 195 | static SHELL_VAR *new_shell_variable __P((const char *)); |
7117c2d2 JA |
196 | static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *)); |
197 | static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int)); | |
198 | ||
199 | static void free_variable_hash_data __P((PTR_T)); | |
200 | ||
201 | static VARLIST *vlist_alloc __P((int)); | |
202 | static VARLIST *vlist_realloc __P((VARLIST *, int)); | |
203 | static void vlist_add __P((VARLIST *, SHELL_VAR *, int)); | |
204 | ||
205 | static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int)); | |
206 | ||
207 | static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **)); | |
f73dda09 | 208 | |
7117c2d2 JA |
209 | static SHELL_VAR **vapply __P((sh_var_map_func_t *)); |
210 | static SHELL_VAR **fapply __P((sh_var_map_func_t *)); | |
f73dda09 JA |
211 | |
212 | static int visible_var __P((SHELL_VAR *)); | |
f73dda09 | 213 | static int visible_and_exported __P((SHELL_VAR *)); |
7117c2d2 JA |
214 | static int local_and_exported __P((SHELL_VAR *)); |
215 | static int variable_in_context __P((SHELL_VAR *)); | |
f73dda09 JA |
216 | #if defined (ARRAY_VARS) |
217 | static int visible_array_vars __P((SHELL_VAR *)); | |
218 | #endif | |
219 | ||
7117c2d2 JA |
220 | static SHELL_VAR *bind_tempenv_variable __P((const char *, char *)); |
221 | static void push_temp_var __P((PTR_T)); | |
222 | static void propagate_temp_var __P((PTR_T)); | |
223 | static void dispose_temporary_env __P((sh_free_func_t *)); | |
224 | ||
f73dda09 | 225 | static inline char *mk_env_string __P((const char *, const char *)); |
7117c2d2 JA |
226 | static char **make_env_array_from_var_list __P((SHELL_VAR **)); |
227 | static char **make_var_export_array __P((VAR_CONTEXT *)); | |
228 | static char **make_func_export_array __P((void)); | |
229 | static void add_temp_array_to_env __P((char **, int, int)); | |
f73dda09 | 230 | |
7117c2d2 JA |
231 | static int n_shell_variables __P((void)); |
232 | static int set_context __P((SHELL_VAR *)); | |
726f6388 | 233 | |
7117c2d2 JA |
234 | static void push_func_var __P((PTR_T)); |
235 | static void push_exported_var __P((PTR_T)); | |
726f6388 | 236 | |
7117c2d2 JA |
237 | static inline int find_special_var __P((const char *)); |
238 | ||
cce855bc JA |
239 | /* Initialize the shell variables from the current environment. |
240 | If PRIVMODE is nonzero, don't import functions from ENV or | |
241 | parse $SHELLOPTS. */ | |
726f6388 | 242 | void |
cce855bc | 243 | initialize_shell_variables (env, privmode) |
726f6388 | 244 | char **env; |
cce855bc | 245 | int privmode; |
726f6388 | 246 | { |
ccc6cda3 JA |
247 | char *name, *string, *temp_string; |
248 | int c, char_index, string_index, string_length; | |
726f6388 JA |
249 | SHELL_VAR *temp_var; |
250 | ||
cce855bc | 251 | if (shell_variables == 0) |
7117c2d2 JA |
252 | { |
253 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
254 | shell_variables->scope = 0; | |
255 | shell_variables->table = hash_create (0); | |
256 | } | |
726f6388 | 257 | |
cce855bc | 258 | if (shell_functions == 0) |
7117c2d2 | 259 | shell_functions = hash_create (0); |
726f6388 | 260 | |
d3a24ed2 CR |
261 | #if defined (DEBUGGER) |
262 | if (shell_function_defs == 0) | |
263 | shell_function_defs = hash_create (0); | |
264 | #endif | |
265 | ||
ccc6cda3 | 266 | for (string_index = 0; string = env[string_index++]; ) |
726f6388 | 267 | { |
726f6388 | 268 | char_index = 0; |
d166f048 | 269 | name = string; |
726f6388 | 270 | while ((c = *string++) && c != '=') |
d166f048 JA |
271 | ; |
272 | if (string[-1] == '=') | |
28ef6c31 | 273 | char_index = string - name - 1; |
726f6388 | 274 | |
d166f048 JA |
275 | /* If there are weird things in the environment, like `=xxx' or a |
276 | string without an `=', just skip them. */ | |
277 | if (char_index == 0) | |
28ef6c31 | 278 | continue; |
d166f048 JA |
279 | |
280 | /* ASSERT(name[char_index] == '=') */ | |
726f6388 | 281 | name[char_index] = '\0'; |
d166f048 | 282 | /* Now, name = env variable name, string = env variable value, and |
28ef6c31 | 283 | char_index == strlen (name) */ |
726f6388 | 284 | |
f73dda09 | 285 | /* If exported function, define it now. Don't import functions from |
7117c2d2 | 286 | the environment in privileged mode. */ |
bb70624e | 287 | if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4)) |
726f6388 | 288 | { |
d166f048 | 289 | string_length = strlen (string); |
f73dda09 | 290 | temp_string = (char *)xmalloc (3 + string_length + char_index); |
bb70624e | 291 | |
d166f048 JA |
292 | strcpy (temp_string, name); |
293 | temp_string[char_index] = ' '; | |
294 | strcpy (temp_string + char_index + 1, string); | |
726f6388 | 295 | |
d166f048 | 296 | parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST); |
726f6388 | 297 | |
d166f048 JA |
298 | /* Ancient backwards compatibility. Old versions of bash exported |
299 | functions like name()=() {...} */ | |
300 | if (name[char_index - 1] == ')' && name[char_index - 2] == '(') | |
726f6388 JA |
301 | name[char_index - 2] = '\0'; |
302 | ||
ccc6cda3 | 303 | if (temp_var = find_function (name)) |
726f6388 | 304 | { |
bb70624e | 305 | VSETATTR (temp_var, (att_exported|att_imported)); |
726f6388 JA |
306 | array_needs_making = 1; |
307 | } | |
308 | else | |
309 | report_error ("error importing function definition for `%s'", name); | |
d166f048 | 310 | |
bb70624e | 311 | /* ( */ |
d166f048 | 312 | if (name[char_index - 1] == ')' && name[char_index - 2] == '\0') |
bb70624e | 313 | name[char_index - 2] = '('; /* ) */ |
726f6388 | 314 | } |
ccc6cda3 JA |
315 | #if defined (ARRAY_VARS) |
316 | # if 0 | |
317 | /* Array variables may not yet be exported. */ | |
7117c2d2 | 318 | else if (*string == '(' && string[1] == '[' && xstrchr (string, ')')) |
ccc6cda3 JA |
319 | { |
320 | string_length = 1; | |
321 | temp_string = extract_array_assignment_list (string, &string_length); | |
322 | temp_var = assign_array_from_string (name, temp_string); | |
323 | FREE (temp_string); | |
bb70624e | 324 | VSETATTR (temp_var, (att_exported | att_imported)); |
ccc6cda3 JA |
325 | array_needs_making = 1; |
326 | } | |
327 | # endif | |
328 | #endif | |
726f6388 JA |
329 | else |
330 | { | |
ccc6cda3 | 331 | temp_var = bind_variable (name, string); |
bb70624e | 332 | VSETATTR (temp_var, (att_exported | att_imported)); |
726f6388 JA |
333 | array_needs_making = 1; |
334 | } | |
d166f048 JA |
335 | |
336 | name[char_index] = '='; | |
bb70624e | 337 | /* temp_var can be NULL if it was an exported function with a syntax |
28ef6c31 | 338 | error (a different bug, but it still shouldn't dump core). */ |
bb70624e JA |
339 | if (temp_var && function_p (temp_var) == 0) /* XXX not yet */ |
340 | { | |
341 | CACHE_IMPORTSTR (temp_var, name); | |
342 | } | |
726f6388 JA |
343 | } |
344 | ||
28ef6c31 | 345 | set_pwd (); |
b72432fd | 346 | |
ccc6cda3 JA |
347 | /* Set up initial value of $_ */ |
348 | temp_var = bind_variable ("_", dollar_vars[0]); | |
349 | ||
726f6388 | 350 | /* Remember this pid. */ |
f73dda09 | 351 | dollar_dollar_pid = getpid (); |
726f6388 JA |
352 | |
353 | /* Now make our own defaults in case the vars that we think are | |
354 | important are missing. */ | |
355 | temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE); | |
f73dda09 JA |
356 | #if 0 |
357 | set_auto_export (temp_var); /* XXX */ | |
358 | #endif | |
726f6388 JA |
359 | |
360 | temp_var = set_if_not ("TERM", "dumb"); | |
f73dda09 JA |
361 | #if 0 |
362 | set_auto_export (temp_var); /* XXX */ | |
363 | #endif | |
726f6388 | 364 | |
d166f048 JA |
365 | #if defined (qnx) |
366 | /* set node id -- don't import it from the environment */ | |
367 | { | |
368 | char node_name[22]; | |
369 | qnx_nidtostr (getnid (), node_name, sizeof (node_name)); | |
370 | temp_var = bind_variable ("NODE", node_name); | |
371 | set_auto_export (temp_var); | |
372 | } | |
373 | #endif | |
374 | ||
ccc6cda3 | 375 | /* set up the prompts. */ |
726f6388 JA |
376 | if (interactive_shell) |
377 | { | |
b72432fd | 378 | #if defined (PROMPT_STRING_DECODE) |
726f6388 | 379 | set_if_not ("PS1", primary_prompt); |
b72432fd JA |
380 | #else |
381 | if (current_user.uid == -1) | |
382 | get_current_user_info (); | |
383 | set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt); | |
384 | #endif | |
726f6388 JA |
385 | set_if_not ("PS2", secondary_prompt); |
386 | } | |
387 | set_if_not ("PS4", "+ "); | |
388 | ||
ccc6cda3 JA |
389 | /* Don't allow IFS to be imported from the environment. */ |
390 | temp_var = bind_variable ("IFS", " \t\n"); | |
7117c2d2 | 391 | setifs (temp_var); |
726f6388 JA |
392 | |
393 | /* Magic machine types. Pretty convenient. */ | |
f73dda09 | 394 | set_machine_vars (); |
726f6388 | 395 | |
ccc6cda3 JA |
396 | /* Default MAILCHECK for interactive shells. Defer the creation of a |
397 | default MAILPATH until the startup files are read, because MAIL | |
f73dda09 | 398 | names a mail file if MAILPATH is not set, and we should provide a |
ccc6cda3 | 399 | default only if neither is set. */ |
726f6388 | 400 | if (interactive_shell) |
f73dda09 | 401 | set_if_not ("MAILCHECK", posixly_correct ? "600" : "60"); |
726f6388 JA |
402 | |
403 | /* Do some things with shell level. */ | |
d166f048 | 404 | initialize_shell_level (); |
726f6388 | 405 | |
b72432fd | 406 | set_ppid (); |
726f6388 | 407 | |
726f6388 JA |
408 | /* Initialize the `getopts' stuff. */ |
409 | bind_variable ("OPTIND", "1"); | |
d166f048 | 410 | getopts_reset (0); |
726f6388 | 411 | bind_variable ("OPTERR", "1"); |
d166f048 JA |
412 | sh_opterr = 1; |
413 | ||
414 | if (login_shell == 1) | |
415 | set_home_var (); | |
726f6388 JA |
416 | |
417 | /* Get the full pathname to THIS shell, and set the BASH variable | |
418 | to it. */ | |
d166f048 | 419 | name = get_bash_name (); |
ccc6cda3 JA |
420 | temp_var = bind_variable ("BASH", name); |
421 | free (name); | |
422 | ||
423 | /* Make the exported environment variable SHELL be the user's login | |
424 | shell. Note that the `tset' command looks at this variable | |
425 | to determine what style of commands to output; if it ends in "csh", | |
426 | then C-shell commands are output, else Bourne shell commands. */ | |
d166f048 | 427 | set_shell_var (); |
726f6388 JA |
428 | |
429 | /* Make a variable called BASH_VERSION which contains the version info. */ | |
430 | bind_variable ("BASH_VERSION", shell_version_string ()); | |
ccc6cda3 JA |
431 | #if defined (ARRAY_VARS) |
432 | make_vers_array (); | |
433 | #endif | |
726f6388 | 434 | |
d3a24ed2 CR |
435 | if (command_execution_string) |
436 | bind_variable ("BASH_EXECUTION_STRING", command_execution_string); | |
437 | ||
726f6388 JA |
438 | /* Find out if we're supposed to be in Posix.2 mode via an |
439 | environment variable. */ | |
440 | temp_var = find_variable ("POSIXLY_CORRECT"); | |
441 | if (!temp_var) | |
442 | temp_var = find_variable ("POSIX_PEDANTIC"); | |
443 | if (temp_var && imported_p (temp_var)) | |
444 | sv_strict_posix (temp_var->name); | |
445 | ||
446 | #if defined (HISTORY) | |
447 | /* Set history variables to defaults, and then do whatever we would | |
448 | do if the variable had just been set. Do this only in the case | |
449 | that we are remembering commands on the history list. */ | |
450 | if (remember_on_history) | |
451 | { | |
7117c2d2 | 452 | name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0); |
726f6388 JA |
453 | |
454 | set_if_not ("HISTFILE", name); | |
455 | free (name); | |
456 | ||
457 | set_if_not ("HISTSIZE", "500"); | |
458 | sv_histsize ("HISTSIZE"); | |
459 | } | |
460 | #endif /* HISTORY */ | |
461 | ||
462 | /* Seed the random number generator. */ | |
f73dda09 | 463 | sbrand (dollar_dollar_pid + shell_start_time); |
726f6388 JA |
464 | |
465 | /* Handle some "special" variables that we may have inherited from a | |
466 | parent shell. */ | |
d166f048 JA |
467 | if (interactive_shell) |
468 | { | |
469 | temp_var = find_variable ("IGNOREEOF"); | |
470 | if (!temp_var) | |
471 | temp_var = find_variable ("ignoreeof"); | |
472 | if (temp_var && imported_p (temp_var)) | |
473 | sv_ignoreeof (temp_var->name); | |
474 | } | |
726f6388 JA |
475 | |
476 | #if defined (HISTORY) | |
477 | if (interactive_shell && remember_on_history) | |
478 | { | |
ccc6cda3 JA |
479 | sv_history_control ("HISTCONTROL"); |
480 | sv_histignore ("HISTIGNORE"); | |
726f6388 JA |
481 | } |
482 | #endif /* HISTORY */ | |
483 | ||
f73dda09 JA |
484 | /* |
485 | * 24 October 2001 | |
486 | * | |
487 | * I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT | |
488 | * and SSH2_CLIENT alone. I'm going to rely on the shell_level check in | |
489 | * isnetconn() to avoid running the startup files more often than wanted. | |
490 | * That will, of course, only work if the user's login shell is bash, so | |
491 | * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined | |
492 | * in config-top.h. | |
493 | */ | |
494 | #if 0 | |
bb70624e | 495 | temp_var = find_variable ("SSH_CLIENT"); |
28ef6c31 JA |
496 | if (temp_var && imported_p (temp_var)) |
497 | { | |
498 | VUNSETATTR (temp_var, att_exported); | |
499 | array_needs_making = 1; | |
500 | } | |
501 | temp_var = find_variable ("SSH2_CLIENT"); | |
bb70624e JA |
502 | if (temp_var && imported_p (temp_var)) |
503 | { | |
504 | VUNSETATTR (temp_var, att_exported); | |
505 | array_needs_making = 1; | |
506 | } | |
f73dda09 | 507 | #endif |
bb70624e | 508 | |
ccc6cda3 JA |
509 | /* Get the user's real and effective user ids. */ |
510 | uidset (); | |
511 | ||
726f6388 JA |
512 | /* Initialize the dynamic variables, and seed their values. */ |
513 | initialize_dynamic_variables (); | |
726f6388 JA |
514 | } |
515 | ||
7117c2d2 JA |
516 | /* **************************************************************** */ |
517 | /* */ | |
518 | /* Setting values for special shell variables */ | |
519 | /* */ | |
520 | /* **************************************************************** */ | |
521 | ||
f73dda09 JA |
522 | static void |
523 | set_machine_vars () | |
524 | { | |
525 | SHELL_VAR *temp_var; | |
526 | ||
527 | temp_var = set_if_not ("HOSTTYPE", HOSTTYPE); | |
528 | temp_var = set_if_not ("OSTYPE", OSTYPE); | |
529 | temp_var = set_if_not ("MACHTYPE", MACHTYPE); | |
530 | ||
531 | temp_var = set_if_not ("HOSTNAME", current_host_name); | |
532 | } | |
533 | ||
d166f048 JA |
534 | /* Set $HOME to the information in the password file if we didn't get |
535 | it from the environment. */ | |
b72432fd JA |
536 | |
537 | /* This function is not static so the tilde and readline libraries can | |
538 | use it. */ | |
539 | char * | |
28ef6c31 | 540 | sh_get_home_dir () |
b72432fd JA |
541 | { |
542 | if (current_user.home_dir == 0) | |
543 | get_current_user_info (); | |
544 | return current_user.home_dir; | |
545 | } | |
546 | ||
d166f048 JA |
547 | static void |
548 | set_home_var () | |
549 | { | |
550 | SHELL_VAR *temp_var; | |
551 | ||
552 | temp_var = find_variable ("HOME"); | |
553 | if (temp_var == 0) | |
28ef6c31 | 554 | temp_var = bind_variable ("HOME", sh_get_home_dir ()); |
f73dda09 | 555 | #if 0 |
bb70624e | 556 | VSETATTR (temp_var, att_exported); |
f73dda09 | 557 | #endif |
d166f048 JA |
558 | } |
559 | ||
560 | /* Set $SHELL to the user's login shell if it is not already set. Call | |
561 | get_current_user_info if we haven't already fetched the shell. */ | |
562 | static void | |
563 | set_shell_var () | |
564 | { | |
565 | SHELL_VAR *temp_var; | |
566 | ||
567 | temp_var = find_variable ("SHELL"); | |
568 | if (temp_var == 0) | |
569 | { | |
570 | if (current_user.shell == 0) | |
571 | get_current_user_info (); | |
572 | temp_var = bind_variable ("SHELL", current_user.shell); | |
573 | } | |
f73dda09 | 574 | #if 0 |
bb70624e | 575 | VSETATTR (temp_var, att_exported); |
f73dda09 | 576 | #endif |
d166f048 JA |
577 | } |
578 | ||
579 | static char * | |
580 | get_bash_name () | |
581 | { | |
582 | char *name; | |
583 | ||
28ef6c31 | 584 | if ((login_shell == 1) && RELPATH(shell_name)) |
d166f048 JA |
585 | { |
586 | if (current_user.shell == 0) | |
28ef6c31 | 587 | get_current_user_info (); |
d166f048 JA |
588 | name = savestring (current_user.shell); |
589 | } | |
28ef6c31 | 590 | else if (ABSPATH(shell_name)) |
d166f048 JA |
591 | name = savestring (shell_name); |
592 | else if (shell_name[0] == '.' && shell_name[1] == '/') | |
593 | { | |
594 | /* Fast path for common case. */ | |
595 | char *cdir; | |
596 | int len; | |
597 | ||
598 | cdir = get_string_value ("PWD"); | |
28ef6c31 JA |
599 | if (cdir) |
600 | { | |
601 | len = strlen (cdir); | |
f73dda09 | 602 | name = (char *)xmalloc (len + strlen (shell_name) + 1); |
28ef6c31 JA |
603 | strcpy (name, cdir); |
604 | strcpy (name + len, shell_name + 1); | |
605 | } | |
606 | else | |
607 | name = savestring (shell_name); | |
d166f048 JA |
608 | } |
609 | else | |
610 | { | |
611 | char *tname; | |
612 | int s; | |
613 | ||
614 | tname = find_user_command (shell_name); | |
615 | ||
616 | if (tname == 0) | |
617 | { | |
618 | /* Try the current directory. If there is not an executable | |
619 | there, just punt and use the login shell. */ | |
620 | s = file_status (shell_name); | |
621 | if (s & FS_EXECABLE) | |
622 | { | |
623 | tname = make_absolute (shell_name, get_string_value ("PWD")); | |
624 | if (*shell_name == '.') | |
625 | { | |
28ef6c31 | 626 | name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS); |
d166f048 JA |
627 | if (name == 0) |
628 | name = tname; | |
629 | else | |
630 | free (tname); | |
631 | } | |
632 | else | |
633 | name = tname; | |
634 | } | |
635 | else | |
636 | { | |
637 | if (current_user.shell == 0) | |
638 | get_current_user_info (); | |
639 | name = savestring (current_user.shell); | |
640 | } | |
641 | } | |
642 | else | |
643 | { | |
644 | name = full_pathname (tname); | |
645 | free (tname); | |
646 | } | |
647 | } | |
648 | ||
649 | return (name); | |
650 | } | |
651 | ||
726f6388 JA |
652 | void |
653 | adjust_shell_level (change) | |
654 | int change; | |
655 | { | |
d166f048 | 656 | char new_level[5], *old_SHLVL; |
7117c2d2 | 657 | intmax_t old_level; |
d166f048 | 658 | SHELL_VAR *temp_var; |
726f6388 JA |
659 | |
660 | old_SHLVL = get_string_value ("SHLVL"); | |
f73dda09 JA |
661 | if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0) |
662 | old_level = 0; | |
726f6388 JA |
663 | |
664 | shell_level = old_level + change; | |
665 | if (shell_level < 0) | |
666 | shell_level = 0; | |
d166f048 JA |
667 | else if (shell_level > 1000) |
668 | { | |
cce855bc | 669 | internal_warning ("shell level (%d) too high, resetting to 1", shell_level); |
d166f048 JA |
670 | shell_level = 1; |
671 | } | |
672 | ||
673 | /* We don't need the full generality of itos here. */ | |
674 | if (shell_level < 10) | |
675 | { | |
676 | new_level[0] = shell_level + '0'; | |
677 | new_level[1] = '\0'; | |
678 | } | |
679 | else if (shell_level < 100) | |
680 | { | |
681 | new_level[0] = (shell_level / 10) + '0'; | |
682 | new_level[1] = (shell_level % 10) + '0'; | |
683 | new_level[2] = '\0'; | |
684 | } | |
685 | else if (shell_level < 1000) | |
686 | { | |
687 | new_level[0] = (shell_level / 100) + '0'; | |
688 | old_level = shell_level % 100; | |
689 | new_level[1] = (old_level / 10) + '0'; | |
690 | new_level[2] = (old_level % 10) + '0'; | |
691 | new_level[3] = '\0'; | |
692 | } | |
693 | ||
694 | temp_var = bind_variable ("SHLVL", new_level); | |
695 | set_auto_export (temp_var); | |
696 | } | |
697 | ||
698 | static void | |
699 | initialize_shell_level () | |
700 | { | |
d166f048 | 701 | adjust_shell_level (1); |
726f6388 JA |
702 | } |
703 | ||
28ef6c31 JA |
704 | /* If we got PWD from the environment, update our idea of the current |
705 | working directory. In any case, make sure that PWD exists before | |
706 | checking it. It is possible for getcwd () to fail on shell startup, | |
707 | and in that case, PWD would be undefined. If this is an interactive | |
708 | login shell, see if $HOME is the current working directory, and if | |
709 | that's not the same string as $PWD, set PWD=$HOME. */ | |
710 | ||
711 | void | |
712 | set_pwd () | |
713 | { | |
714 | SHELL_VAR *temp_var, *home_var; | |
715 | char *temp_string, *home_string; | |
716 | ||
717 | home_var = find_variable ("HOME"); | |
718 | home_string = home_var ? value_cell (home_var) : (char *)NULL; | |
719 | ||
720 | temp_var = find_variable ("PWD"); | |
721 | if (temp_var && imported_p (temp_var) && | |
722 | (temp_string = value_cell (temp_var)) && | |
723 | same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
724 | set_working_directory (temp_string); | |
725 | else if (home_string && interactive_shell && login_shell && | |
726 | same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
727 | { | |
728 | set_working_directory (home_string); | |
729 | temp_var = bind_variable ("PWD", home_string); | |
730 | set_auto_export (temp_var); | |
731 | } | |
732 | else | |
733 | { | |
734 | temp_string = get_working_directory ("shell-init"); | |
735 | if (temp_string) | |
736 | { | |
737 | temp_var = bind_variable ("PWD", temp_string); | |
738 | set_auto_export (temp_var); | |
739 | free (temp_string); | |
740 | } | |
741 | } | |
742 | ||
743 | /* According to the Single Unix Specification, v2, $OLDPWD is an | |
744 | `environment variable' and therefore should be auto-exported. | |
745 | Make a dummy invisible variable for OLDPWD, and mark it as exported. */ | |
746 | temp_var = bind_variable ("OLDPWD", (char *)NULL); | |
747 | VSETATTR (temp_var, (att_exported | att_invisible)); | |
748 | } | |
749 | ||
b72432fd JA |
750 | /* Make a variable $PPID, which holds the pid of the shell's parent. */ |
751 | void | |
752 | set_ppid () | |
753 | { | |
f73dda09 | 754 | char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name; |
b72432fd JA |
755 | SHELL_VAR *temp_var; |
756 | ||
f73dda09 | 757 | name = inttostr (getppid (), namebuf, sizeof(namebuf)); |
b72432fd JA |
758 | temp_var = find_variable ("PPID"); |
759 | if (temp_var) | |
bb70624e | 760 | VUNSETATTR (temp_var, (att_readonly | att_exported)); |
b72432fd | 761 | temp_var = bind_variable ("PPID", name); |
bb70624e | 762 | VSETATTR (temp_var, (att_readonly | att_integer)); |
b72432fd JA |
763 | } |
764 | ||
ccc6cda3 JA |
765 | static void |
766 | uidset () | |
726f6388 | 767 | { |
f73dda09 | 768 | char buff[INT_STRLEN_BOUND(uid_t) + 1], *b; |
ccc6cda3 JA |
769 | register SHELL_VAR *v; |
770 | ||
b72432fd | 771 | b = inttostr (current_user.uid, buff, sizeof (buff)); |
ccc6cda3 | 772 | v = find_variable ("UID"); |
28ef6c31 JA |
773 | if (v == 0) |
774 | { | |
775 | v = bind_variable ("UID", b); | |
776 | VSETATTR (v, (att_readonly | att_integer)); | |
777 | } | |
726f6388 | 778 | |
ccc6cda3 | 779 | if (current_user.euid != current_user.uid) |
b72432fd | 780 | b = inttostr (current_user.euid, buff, sizeof (buff)); |
726f6388 | 781 | |
ccc6cda3 | 782 | v = find_variable ("EUID"); |
28ef6c31 JA |
783 | if (v == 0) |
784 | { | |
785 | v = bind_variable ("EUID", b); | |
786 | VSETATTR (v, (att_readonly | att_integer)); | |
787 | } | |
ccc6cda3 JA |
788 | } |
789 | ||
790 | #if defined (ARRAY_VARS) | |
791 | static void | |
792 | make_vers_array () | |
793 | { | |
794 | SHELL_VAR *vv; | |
795 | ARRAY *av; | |
f73dda09 | 796 | char *s, d[32], b[INT_STRLEN_BOUND(int) + 1]; |
ccc6cda3 | 797 | |
7117c2d2 | 798 | unbind_variable ("BASH_VERSINFO"); |
ccc6cda3 JA |
799 | |
800 | vv = make_new_array_variable ("BASH_VERSINFO"); | |
801 | av = array_cell (vv); | |
802 | strcpy (d, dist_version); | |
7117c2d2 | 803 | s = xstrchr (d, '.'); |
ccc6cda3 JA |
804 | if (s) |
805 | *s++ = '\0'; | |
7117c2d2 JA |
806 | array_insert (av, 0, d); |
807 | array_insert (av, 1, s); | |
f73dda09 | 808 | s = inttostr (patch_level, b, sizeof (b)); |
7117c2d2 | 809 | array_insert (av, 2, s); |
f73dda09 | 810 | s = inttostr (build_version, b, sizeof (b)); |
7117c2d2 JA |
811 | array_insert (av, 3, s); |
812 | array_insert (av, 4, release_status); | |
813 | array_insert (av, 5, MACHTYPE); | |
ccc6cda3 | 814 | |
bb70624e | 815 | VSETATTR (vv, att_readonly); |
ccc6cda3 JA |
816 | } |
817 | #endif /* ARRAY_VARS */ | |
818 | ||
819 | /* Set the environment variables $LINES and $COLUMNS in response to | |
820 | a window size change. */ | |
821 | void | |
28ef6c31 | 822 | sh_set_lines_and_columns (lines, cols) |
ccc6cda3 JA |
823 | int lines, cols; |
824 | { | |
f73dda09 | 825 | char val[INT_STRLEN_BOUND(int) + 1], *v; |
ccc6cda3 | 826 | |
b72432fd JA |
827 | v = inttostr (lines, val, sizeof (val)); |
828 | bind_variable ("LINES", v); | |
ccc6cda3 | 829 | |
b72432fd JA |
830 | v = inttostr (cols, val, sizeof (val)); |
831 | bind_variable ("COLUMNS", v); | |
726f6388 JA |
832 | } |
833 | ||
7117c2d2 JA |
834 | /* **************************************************************** */ |
835 | /* */ | |
836 | /* Printing variables and values */ | |
837 | /* */ | |
838 | /* **************************************************************** */ | |
726f6388 | 839 | |
28ef6c31 JA |
840 | /* Print LIST (a list of shell variables) to stdout in such a way that |
841 | they can be read back in. */ | |
726f6388 JA |
842 | void |
843 | print_var_list (list) | |
844 | register SHELL_VAR **list; | |
845 | { | |
846 | register int i; | |
847 | register SHELL_VAR *var; | |
848 | ||
849 | for (i = 0; list && (var = list[i]); i++) | |
7117c2d2 | 850 | if (invisible_p (var) == 0) |
726f6388 JA |
851 | print_assignment (var); |
852 | } | |
853 | ||
28ef6c31 JA |
854 | /* Print LIST (a list of shell functions) to stdout in such a way that |
855 | they can be read back in. */ | |
856 | void | |
857 | print_func_list (list) | |
858 | register SHELL_VAR **list; | |
859 | { | |
860 | register int i; | |
861 | register SHELL_VAR *var; | |
862 | ||
863 | for (i = 0; list && (var = list[i]); i++) | |
864 | { | |
865 | printf ("%s ", var->name); | |
866 | print_var_function (var); | |
867 | printf ("\n"); | |
868 | } | |
869 | } | |
870 | ||
726f6388 JA |
871 | /* Print the value of a single SHELL_VAR. No newline is |
872 | output, but the variable is printed in such a way that | |
873 | it can be read back in. */ | |
874 | void | |
875 | print_assignment (var) | |
876 | SHELL_VAR *var; | |
877 | { | |
7117c2d2 JA |
878 | if (var_isset (var) == 0) |
879 | return; | |
880 | ||
881 | if (function_p (var)) | |
726f6388 | 882 | { |
28ef6c31 | 883 | printf ("%s", var->name); |
726f6388 JA |
884 | print_var_function (var); |
885 | printf ("\n"); | |
886 | } | |
ccc6cda3 | 887 | #if defined (ARRAY_VARS) |
7117c2d2 | 888 | else if (array_p (var)) |
ccc6cda3 JA |
889 | print_array_assignment (var, 0); |
890 | #endif /* ARRAY_VARS */ | |
7117c2d2 | 891 | else |
726f6388 JA |
892 | { |
893 | printf ("%s=", var->name); | |
ccc6cda3 | 894 | print_var_value (var, 1); |
726f6388 JA |
895 | printf ("\n"); |
896 | } | |
897 | } | |
898 | ||
899 | /* Print the value cell of VAR, a shell variable. Do not print | |
ccc6cda3 JA |
900 | the name, nor leading/trailing newline. If QUOTE is non-zero, |
901 | and the value contains shell metacharacters, quote the value | |
902 | in such a way that it can be read back in. */ | |
726f6388 | 903 | void |
ccc6cda3 | 904 | print_var_value (var, quote) |
726f6388 | 905 | SHELL_VAR *var; |
ccc6cda3 | 906 | int quote; |
726f6388 | 907 | { |
ccc6cda3 JA |
908 | char *t; |
909 | ||
7117c2d2 JA |
910 | if (var_isset (var) == 0) |
911 | return; | |
912 | ||
913 | if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var))) | |
ccc6cda3 | 914 | { |
7117c2d2 JA |
915 | t = ansic_quote (value_cell (var), 0, (int *)0); |
916 | printf ("%s", t); | |
917 | free (t); | |
918 | } | |
919 | else if (quote && sh_contains_shell_metas (value_cell (var))) | |
920 | { | |
921 | t = sh_single_quote (value_cell (var)); | |
922 | printf ("%s", t); | |
923 | free (t); | |
ccc6cda3 | 924 | } |
7117c2d2 JA |
925 | else |
926 | printf ("%s", value_cell (var)); | |
726f6388 JA |
927 | } |
928 | ||
929 | /* Print the function cell of VAR, a shell variable. Do not | |
930 | print the name, nor leading/trailing newline. */ | |
931 | void | |
932 | print_var_function (var) | |
933 | SHELL_VAR *var; | |
934 | { | |
7117c2d2 | 935 | if (function_p (var) && var_isset (var)) |
726f6388 JA |
936 | printf ("%s", named_function_string ((char *)NULL, function_cell(var), 1)); |
937 | } | |
938 | ||
939 | /* **************************************************************** */ | |
ccc6cda3 | 940 | /* */ |
7117c2d2 | 941 | /* Dynamic Variables */ |
ccc6cda3 | 942 | /* */ |
726f6388 JA |
943 | /* **************************************************************** */ |
944 | ||
945 | /* DYNAMIC VARIABLES | |
ccc6cda3 | 946 | |
726f6388 JA |
947 | These are variables whose values are generated anew each time they are |
948 | referenced. These are implemented using a pair of function pointers | |
7117c2d2 JA |
949 | in the struct variable: assign_func, which is called from bind_variable |
950 | and, if arrays are compiled into the shell, some of the functions in | |
951 | arrayfunc.c, and dynamic_value, which is called from find_variable. | |
952 | ||
953 | assign_func is called from bind_variable_internal, if | |
954 | bind_variable_internal discovers that the variable being assigned to | |
955 | has such a function. The function is called as | |
956 | SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind) | |
726f6388 | 957 | and the (SHELL_VAR *)temp is returned as the value of bind_variable. It |
7117c2d2 JA |
958 | is usually ENTRY (self). IND is an index for an array variable, and |
959 | unused otherwise. | |
ccc6cda3 | 960 | |
7117c2d2 JA |
961 | dynamic_value is called from find_variable_internal to return a `new' |
962 | value for the specified dynamic varible. If this function is NULL, | |
963 | the variable is treated as a `normal' shell variable. If it is not, | |
964 | however, then this function is called like this: | |
965 | tempvar = (*(var->dynamic_value)) (var); | |
ccc6cda3 | 966 | |
726f6388 JA |
967 | Sometimes `tempvar' will replace the value of `var'. Other times, the |
968 | shell will simply use the string value. Pretty object-oriented, huh? | |
ccc6cda3 | 969 | |
726f6388 JA |
970 | Be warned, though: if you `unset' a special variable, it loses its |
971 | special meaning, even if you subsequently set it. | |
ccc6cda3 | 972 | |
726f6388 | 973 | The special assignment code would probably have been better put in |
7117c2d2 | 974 | subst.c: do_assignment_internal, in the same style as |
726f6388 JA |
975 | stupidly_hack_special_variables, but I wanted the changes as |
976 | localized as possible. */ | |
977 | ||
f73dda09 JA |
978 | #define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \ |
979 | do \ | |
980 | { \ | |
981 | v = bind_variable (var, (val)); \ | |
982 | v->dynamic_value = gfunc; \ | |
983 | v->assign_func = afunc; \ | |
984 | } \ | |
985 | while (0) | |
986 | ||
987 | #define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \ | |
988 | do \ | |
989 | { \ | |
990 | v = make_new_array_variable (var); \ | |
991 | v->dynamic_value = gfunc; \ | |
992 | v->assign_func = afunc; \ | |
993 | } \ | |
994 | while (0) | |
995 | ||
bb70624e | 996 | static SHELL_VAR * |
7117c2d2 | 997 | null_assign (self, value, unused) |
bb70624e JA |
998 | SHELL_VAR *self; |
999 | char *value; | |
7117c2d2 | 1000 | arrayind_t unused; |
bb70624e JA |
1001 | { |
1002 | return (self); | |
1003 | } | |
1004 | ||
1005 | #if defined (ARRAY_VARS) | |
1006 | static SHELL_VAR * | |
7117c2d2 | 1007 | null_array_assign (self, value, ind) |
bb70624e | 1008 | SHELL_VAR *self; |
bb70624e | 1009 | char *value; |
7117c2d2 | 1010 | arrayind_t ind; |
bb70624e JA |
1011 | { |
1012 | return (self); | |
1013 | } | |
1014 | #endif | |
1015 | ||
d3a24ed2 CR |
1016 | /* Degenerate `dynamic_value' function; just returns what's passed without |
1017 | manipulation. */ | |
1018 | static SHELL_VAR * | |
1019 | get_self (self) | |
1020 | SHELL_VAR *self; | |
1021 | { | |
1022 | return (self); | |
1023 | } | |
1024 | ||
1025 | #if defined (ARRAY_VARS) | |
1026 | /* A generic dynamic array variable initializer. Intialize array variable | |
1027 | NAME with dynamic value function GETFUNC and assignment function SETFUNC. */ | |
1028 | static SHELL_VAR * | |
1029 | init_dynamic_array_var (name, getfunc, setfunc, attrs) | |
1030 | char *name; | |
1031 | sh_var_value_func_t *getfunc; | |
1032 | sh_var_assign_func_t *setfunc; | |
1033 | int attrs; | |
1034 | { | |
1035 | SHELL_VAR *v; | |
1036 | ||
1037 | v = find_variable (name); | |
1038 | if (v) | |
1039 | return (v); | |
1040 | INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc); | |
1041 | if (attrs) | |
1042 | VSETATTR (v, attrs); | |
1043 | return v; | |
1044 | } | |
1045 | #endif | |
1046 | ||
1047 | ||
726f6388 JA |
1048 | /* The value of $SECONDS. This is the number of seconds since shell |
1049 | invocation, or, the number of seconds since the last assignment + the | |
1050 | value of the last assignment. */ | |
7117c2d2 | 1051 | static intmax_t seconds_value_assigned; |
726f6388 JA |
1052 | |
1053 | static SHELL_VAR * | |
7117c2d2 | 1054 | assign_seconds (self, value, unused) |
726f6388 JA |
1055 | SHELL_VAR *self; |
1056 | char *value; | |
7117c2d2 | 1057 | arrayind_t unused; |
726f6388 | 1058 | { |
f73dda09 JA |
1059 | if (legal_number (value, &seconds_value_assigned) == 0) |
1060 | seconds_value_assigned = 0; | |
726f6388 JA |
1061 | shell_start_time = NOW; |
1062 | return (self); | |
1063 | } | |
1064 | ||
1065 | static SHELL_VAR * | |
1066 | get_seconds (var) | |
1067 | SHELL_VAR *var; | |
1068 | { | |
1069 | time_t time_since_start; | |
1070 | char *p; | |
1071 | ||
1072 | time_since_start = NOW - shell_start_time; | |
f73dda09 | 1073 | p = itos(seconds_value_assigned + time_since_start); |
726f6388 | 1074 | |
7117c2d2 | 1075 | FREE (value_cell (var)); |
726f6388 | 1076 | |
bb70624e | 1077 | VSETATTR (var, att_integer); |
7117c2d2 | 1078 | var_setvalue (var, p); |
726f6388 JA |
1079 | return (var); |
1080 | } | |
1081 | ||
f73dda09 JA |
1082 | static SHELL_VAR * |
1083 | init_seconds_var () | |
1084 | { | |
1085 | SHELL_VAR *v; | |
1086 | ||
1087 | v = find_variable ("SECONDS"); | |
1088 | if (v) | |
1089 | { | |
1090 | if (legal_number (value_cell(v), &seconds_value_assigned) == 0) | |
1091 | seconds_value_assigned = 0; | |
1092 | } | |
7117c2d2 | 1093 | INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds); |
f73dda09 JA |
1094 | return v; |
1095 | } | |
1096 | ||
726f6388 JA |
1097 | /* The random number seed. You can change this by setting RANDOM. */ |
1098 | static unsigned long rseed = 1; | |
f73dda09 | 1099 | static int last_random_value; |
726f6388 | 1100 | |
f73dda09 | 1101 | /* A linear congruential random number generator based on the example |
7117c2d2 | 1102 | one in the ANSI C standard. This one isn't very good, but a more |
f73dda09 | 1103 | complicated one is overkill. */ |
726f6388 JA |
1104 | |
1105 | /* Returns a pseudo-random number between 0 and 32767. */ | |
1106 | static int | |
1107 | brand () | |
1108 | { | |
1109 | rseed = rseed * 1103515245 + 12345; | |
f73dda09 | 1110 | return ((unsigned int)((rseed >> 16) & 32767)); /* was % 32768 */ |
726f6388 JA |
1111 | } |
1112 | ||
1113 | /* Set the random number generator seed to SEED. */ | |
1114 | static void | |
1115 | sbrand (seed) | |
f73dda09 | 1116 | unsigned long seed; |
726f6388 JA |
1117 | { |
1118 | rseed = seed; | |
e8ce775d | 1119 | last_random_value = 0; |
726f6388 JA |
1120 | } |
1121 | ||
1122 | static SHELL_VAR * | |
7117c2d2 | 1123 | assign_random (self, value, unused) |
726f6388 JA |
1124 | SHELL_VAR *self; |
1125 | char *value; | |
7117c2d2 | 1126 | arrayind_t unused; |
726f6388 | 1127 | { |
f73dda09 | 1128 | sbrand (strtoul (value, (char **)NULL, 10)); |
726f6388 JA |
1129 | return (self); |
1130 | } | |
1131 | ||
28ef6c31 JA |
1132 | int |
1133 | get_random_number () | |
726f6388 JA |
1134 | { |
1135 | int rv; | |
726f6388 | 1136 | |
ccc6cda3 JA |
1137 | /* Reset for command and process substitution. */ |
1138 | if (subshell_environment) | |
f73dda09 | 1139 | sbrand (rseed + getpid() + NOW); |
ccc6cda3 JA |
1140 | |
1141 | do | |
1142 | rv = brand (); | |
f73dda09 | 1143 | while (rv == last_random_value); |
28ef6c31 JA |
1144 | return rv; |
1145 | } | |
ccc6cda3 | 1146 | |
28ef6c31 JA |
1147 | static SHELL_VAR * |
1148 | get_random (var) | |
1149 | SHELL_VAR *var; | |
1150 | { | |
1151 | int rv; | |
1152 | char *p; | |
1153 | ||
1154 | rv = get_random_number (); | |
ccc6cda3 | 1155 | last_random_value = rv; |
f73dda09 | 1156 | p = itos (rv); |
726f6388 | 1157 | |
7117c2d2 | 1158 | FREE (value_cell (var)); |
726f6388 | 1159 | |
bb70624e | 1160 | VSETATTR (var, att_integer); |
7117c2d2 | 1161 | var_setvalue (var, p); |
726f6388 JA |
1162 | return (var); |
1163 | } | |
1164 | ||
7117c2d2 JA |
1165 | static SHELL_VAR * |
1166 | assign_lineno (var, value, unused) | |
1167 | SHELL_VAR *var; | |
1168 | char *value; | |
1169 | arrayind_t unused; | |
1170 | { | |
1171 | intmax_t new_value; | |
1172 | ||
1173 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1174 | new_value = 0; | |
1175 | line_number = new_value; | |
1176 | return var; | |
1177 | } | |
1178 | ||
726f6388 JA |
1179 | /* Function which returns the current line number. */ |
1180 | static SHELL_VAR * | |
1181 | get_lineno (var) | |
1182 | SHELL_VAR *var; | |
1183 | { | |
1184 | char *p; | |
ccc6cda3 | 1185 | int ln; |
726f6388 | 1186 | |
ccc6cda3 JA |
1187 | ln = executing_line_number (); |
1188 | p = itos (ln); | |
7117c2d2 JA |
1189 | FREE (value_cell (var)); |
1190 | var_setvalue (var, p); | |
726f6388 JA |
1191 | return (var); |
1192 | } | |
1193 | ||
d3a24ed2 CR |
1194 | static SHELL_VAR * |
1195 | assign_subshell (var, value, unused) | |
1196 | SHELL_VAR *var; | |
1197 | char *value; | |
1198 | arrayind_t unused; | |
1199 | { | |
1200 | intmax_t new_value; | |
1201 | ||
1202 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1203 | new_value = 0; | |
1204 | subshell_level = new_value; | |
1205 | return var; | |
1206 | } | |
1207 | ||
1208 | static SHELL_VAR * | |
1209 | get_subshell (var) | |
1210 | SHELL_VAR *var; | |
1211 | { | |
1212 | char *p; | |
1213 | ||
1214 | p = itos (subshell_level); | |
1215 | FREE (value_cell (var)); | |
1216 | var_setvalue (var, p); | |
1217 | return (var); | |
1218 | } | |
1219 | ||
1220 | static SHELL_VAR * | |
1221 | get_bash_command (var) | |
1222 | SHELL_VAR *var; | |
1223 | { | |
1224 | char *p; | |
1225 | ||
1226 | p = savestring (the_printed_command_except_trap); | |
1227 | FREE (value_cell (var)); | |
1228 | var_setvalue (var, p); | |
1229 | return (var); | |
1230 | } | |
1231 | ||
726f6388 JA |
1232 | #if defined (HISTORY) |
1233 | static SHELL_VAR * | |
1234 | get_histcmd (var) | |
1235 | SHELL_VAR *var; | |
1236 | { | |
1237 | char *p; | |
1238 | ||
1239 | p = itos (history_number ()); | |
7117c2d2 JA |
1240 | FREE (value_cell (var)); |
1241 | var_setvalue (var, p); | |
726f6388 JA |
1242 | return (var); |
1243 | } | |
1244 | #endif | |
1245 | ||
d3a24ed2 CR |
1246 | #if defined (READLINE) |
1247 | /* When this function returns, VAR->value points to malloced memory. */ | |
1248 | static SHELL_VAR * | |
1249 | get_comp_wordbreaks (var) | |
1250 | SHELL_VAR *var; | |
1251 | { | |
1252 | char *p; | |
1253 | ||
1254 | /* If we don't have anything yet, assign a default value. */ | |
1255 | if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0) | |
1256 | enable_hostname_completion (perform_hostname_completion); | |
1257 | ||
1258 | #if 0 | |
1259 | FREE (value_cell (var)); | |
1260 | p = savestring (rl_completer_word_break_characters); | |
1261 | ||
1262 | var_setvalue (var, p); | |
1263 | #else | |
1264 | var_setvalue (var, rl_completer_word_break_characters); | |
1265 | #endif | |
1266 | ||
1267 | return (var); | |
1268 | } | |
1269 | ||
1270 | /* When this function returns, rl_completer_word_break_characters points to | |
1271 | malloced memory. */ | |
1272 | static SHELL_VAR * | |
1273 | assign_comp_wordbreaks (self, value, unused) | |
1274 | SHELL_VAR *self; | |
1275 | char *value; | |
1276 | arrayind_t unused; | |
1277 | { | |
1278 | if (rl_completer_word_break_characters && | |
1279 | rl_completer_word_break_characters != rl_basic_word_break_characters) | |
1280 | free (rl_completer_word_break_characters); | |
1281 | ||
1282 | rl_completer_word_break_characters = savestring (value); | |
1283 | return self; | |
1284 | } | |
1285 | #endif /* READLINE */ | |
1286 | ||
ccc6cda3 | 1287 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) |
d3a24ed2 | 1288 | static SHELL_VAR * |
7117c2d2 JA |
1289 | assign_dirstack (self, value, ind) |
1290 | SHELL_VAR *self; | |
1291 | char *value; | |
1292 | arrayind_t ind; | |
1293 | { | |
1294 | set_dirstack_element (ind, 1, value); | |
1295 | return self; | |
1296 | } | |
1297 | ||
ccc6cda3 JA |
1298 | static SHELL_VAR * |
1299 | get_dirstack (self) | |
1300 | SHELL_VAR *self; | |
1301 | { | |
1302 | ARRAY *a; | |
1303 | WORD_LIST *l; | |
1304 | ||
1305 | l = get_directory_stack (); | |
7117c2d2 JA |
1306 | a = array_from_word_list (l); |
1307 | array_dispose (array_cell (self)); | |
d166f048 | 1308 | dispose_words (l); |
7117c2d2 | 1309 | var_setarray (self, a); |
ccc6cda3 JA |
1310 | return self; |
1311 | } | |
1312 | #endif /* PUSHD AND POPD && ARRAY_VARS */ | |
1313 | ||
d166f048 JA |
1314 | #if defined (ARRAY_VARS) |
1315 | /* We don't want to initialize the group set with a call to getgroups() | |
1316 | unless we're asked to, but we only want to do it once. */ | |
1317 | static SHELL_VAR * | |
1318 | get_groupset (self) | |
1319 | SHELL_VAR *self; | |
1320 | { | |
1321 | register int i; | |
1322 | int ng; | |
1323 | ARRAY *a; | |
1324 | static char **group_set = (char **)NULL; | |
1325 | ||
1326 | if (group_set == 0) | |
1327 | { | |
1328 | group_set = get_group_list (&ng); | |
1329 | a = array_cell (self); | |
1330 | for (i = 0; i < ng; i++) | |
7117c2d2 | 1331 | array_insert (a, i, group_set[i]); |
d166f048 JA |
1332 | } |
1333 | return (self); | |
1334 | } | |
1335 | #endif /* ARRAY_VARS */ | |
bb70624e | 1336 | |
d3a24ed2 CR |
1337 | /* If ARRAY_VARS is not defined, this just returns the name of any |
1338 | currently-executing function. If we have arrays, it's a call stack. */ | |
bb70624e JA |
1339 | static SHELL_VAR * |
1340 | get_funcname (self) | |
1341 | SHELL_VAR *self; | |
1342 | { | |
d3a24ed2 | 1343 | #if ! defined (ARRAY_VARS) |
7117c2d2 | 1344 | char *t; |
bb70624e JA |
1345 | if (variable_context && this_shell_function) |
1346 | { | |
7117c2d2 JA |
1347 | FREE (value_cell (self)); |
1348 | t = savestring (this_shell_function->name); | |
1349 | var_setvalue (self, t); | |
bb70624e | 1350 | } |
d3a24ed2 | 1351 | #endif |
bb70624e JA |
1352 | return (self); |
1353 | } | |
1354 | ||
1355 | void | |
1356 | make_funcname_visible (on_or_off) | |
1357 | int on_or_off; | |
726f6388 JA |
1358 | { |
1359 | SHELL_VAR *v; | |
1360 | ||
bb70624e JA |
1361 | v = find_variable ("FUNCNAME"); |
1362 | if (v == 0 || v->dynamic_value == 0) | |
1363 | return; | |
1364 | ||
1365 | if (on_or_off) | |
1366 | VUNSETATTR (v, att_invisible); | |
1367 | else | |
1368 | VSETATTR (v, att_invisible); | |
1369 | } | |
1370 | ||
f73dda09 JA |
1371 | static SHELL_VAR * |
1372 | init_funcname_var () | |
1373 | { | |
1374 | SHELL_VAR *v; | |
bb70624e | 1375 | |
f73dda09 JA |
1376 | v = find_variable ("FUNCNAME"); |
1377 | if (v) | |
1378 | return v; | |
d3a24ed2 CR |
1379 | #if defined (ARRAY_VARS) |
1380 | INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign); | |
1381 | #else | |
f73dda09 | 1382 | INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign); |
d3a24ed2 | 1383 | #endif |
f73dda09 JA |
1384 | VSETATTR (v, att_invisible|att_noassign); |
1385 | return v; | |
1386 | } | |
726f6388 | 1387 | |
bb70624e JA |
1388 | static void |
1389 | initialize_dynamic_variables () | |
1390 | { | |
1391 | SHELL_VAR *v; | |
726f6388 | 1392 | |
f73dda09 JA |
1393 | v = init_seconds_var (); |
1394 | ||
d3a24ed2 CR |
1395 | INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL); |
1396 | INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell); | |
1397 | ||
bb70624e JA |
1398 | INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random); |
1399 | INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno); | |
726f6388 JA |
1400 | |
1401 | #if defined (HISTORY) | |
7117c2d2 | 1402 | INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL); |
726f6388 | 1403 | #endif |
ccc6cda3 | 1404 | |
d3a24ed2 CR |
1405 | #if defined (READLINE) |
1406 | INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks); | |
1407 | #endif | |
1408 | ||
ccc6cda3 | 1409 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) |
d3a24ed2 | 1410 | v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0); |
ccc6cda3 | 1411 | #endif /* PUSHD_AND_POPD && ARRAY_VARS */ |
d166f048 JA |
1412 | |
1413 | #if defined (ARRAY_VARS) | |
d3a24ed2 CR |
1414 | v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign); |
1415 | ||
1416 | # if defined (DEBUGGER) | |
1417 | v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, (att_invisible|att_noassign)); | |
1418 | v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, (att_invisible|att_noassign)); | |
1419 | # endif /* DEBUGGER */ | |
1420 | v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, (att_invisible|att_noassign)); | |
1421 | v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, (att_invisible|att_noassign)); | |
d166f048 | 1422 | #endif |
bb70624e | 1423 | |
f73dda09 | 1424 | v = init_funcname_var (); |
726f6388 JA |
1425 | } |
1426 | ||
7117c2d2 JA |
1427 | /* **************************************************************** */ |
1428 | /* */ | |
1429 | /* Retrieving variables and values */ | |
1430 | /* */ | |
1431 | /* **************************************************************** */ | |
1432 | ||
726f6388 JA |
1433 | /* How to get a pointer to the shell variable or function named NAME. |
1434 | HASHED_VARS is a pointer to the hash table containing the list | |
1435 | of interest (either variables or functions). */ | |
7117c2d2 JA |
1436 | |
1437 | static SHELL_VAR * | |
1438 | hash_lookup (name, hashed_vars) | |
f73dda09 | 1439 | const char *name; |
726f6388 JA |
1440 | HASH_TABLE *hashed_vars; |
1441 | { | |
1442 | BUCKET_CONTENTS *bucket; | |
1443 | ||
7117c2d2 | 1444 | bucket = hash_search (name, hashed_vars, 0); |
ccc6cda3 | 1445 | return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL); |
726f6388 JA |
1446 | } |
1447 | ||
7117c2d2 JA |
1448 | SHELL_VAR * |
1449 | var_lookup (name, vcontext) | |
1450 | const char *name; | |
1451 | VAR_CONTEXT *vcontext; | |
1452 | { | |
1453 | VAR_CONTEXT *vc; | |
1454 | SHELL_VAR *v; | |
1455 | ||
1456 | v = (SHELL_VAR *)NULL; | |
1457 | for (vc = vcontext; vc; vc = vc->down) | |
1458 | if (v = hash_lookup (name, vc->table)) | |
1459 | break; | |
1460 | ||
1461 | return v; | |
1462 | } | |
1463 | ||
726f6388 | 1464 | /* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero, |
7117c2d2 JA |
1465 | then also search the temporarily built list of exported variables. |
1466 | The lookup order is: | |
1467 | temporary_env | |
1468 | shell_variables list | |
1469 | */ | |
1470 | ||
726f6388 | 1471 | SHELL_VAR * |
d3a24ed2 | 1472 | find_variable_internal (name, force_tempenv) |
f73dda09 | 1473 | const char *name; |
d3a24ed2 | 1474 | int force_tempenv; |
726f6388 | 1475 | { |
28ef6c31 | 1476 | SHELL_VAR *var; |
d3a24ed2 | 1477 | int search_tempenv; |
28ef6c31 JA |
1478 | |
1479 | var = (SHELL_VAR *)NULL; | |
726f6388 JA |
1480 | |
1481 | /* If explicitly requested, first look in the temporary environment for | |
1482 | the variable. This allows constructs such as "foo=x eval 'echo $foo'" | |
1483 | to get the `exported' value of $foo. This happens if we are executing | |
1484 | a function or builtin, or if we are looking up a variable in a | |
1485 | "subshell environment". */ | |
d3a24ed2 CR |
1486 | search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment); |
1487 | ||
1488 | if (search_tempenv && temporary_env) | |
7117c2d2 | 1489 | var = hash_lookup (name, temporary_env); |
726f6388 | 1490 | |
7117c2d2 | 1491 | if (var == 0) |
726f6388 JA |
1492 | var = var_lookup (name, shell_variables); |
1493 | ||
7117c2d2 | 1494 | if (var == 0) |
726f6388 JA |
1495 | return ((SHELL_VAR *)NULL); |
1496 | ||
ccc6cda3 | 1497 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); |
726f6388 JA |
1498 | } |
1499 | ||
1500 | /* Look up the variable entry named NAME. Returns the entry or NULL. */ | |
1501 | SHELL_VAR * | |
1502 | find_variable (name) | |
f73dda09 | 1503 | const char *name; |
726f6388 | 1504 | { |
d3a24ed2 | 1505 | return (find_variable_internal (name, (expanding_redir == 0 && this_shell_builtin != 0))); |
726f6388 JA |
1506 | } |
1507 | ||
1508 | /* Look up the function entry whose name matches STRING. | |
1509 | Returns the entry or NULL. */ | |
1510 | SHELL_VAR * | |
1511 | find_function (name) | |
f73dda09 | 1512 | const char *name; |
726f6388 | 1513 | { |
7117c2d2 JA |
1514 | return (hash_lookup (name, shell_functions)); |
1515 | } | |
1516 | ||
d3a24ed2 CR |
1517 | /* Find the function definition for the shell function named NAME. Returns |
1518 | the entry or NULL. */ | |
1519 | FUNCTION_DEF * | |
1520 | find_function_def (name) | |
1521 | const char *name; | |
1522 | { | |
1523 | return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs)); | |
1524 | } | |
1525 | ||
7117c2d2 JA |
1526 | /* Return the value of VAR. VAR is assumed to have been the result of a |
1527 | lookup without any subscript, if arrays are compiled into the shell. */ | |
1528 | char * | |
1529 | get_variable_value (var) | |
1530 | SHELL_VAR *var; | |
1531 | { | |
1532 | if (var == 0) | |
1533 | return ((char *)NULL); | |
1534 | #if defined (ARRAY_VARS) | |
1535 | else if (array_p (var)) | |
1536 | return (array_reference (array_cell (var), 0)); | |
1537 | #endif | |
1538 | else | |
1539 | return (value_cell (var)); | |
726f6388 JA |
1540 | } |
1541 | ||
1542 | /* Return the string value of a variable. Return NULL if the variable | |
7117c2d2 JA |
1543 | doesn't exist. Don't cons a new string. This is a potential memory |
1544 | leak if the variable is found in the temporary environment. Since | |
1545 | functions and variables have separate name spaces, returns NULL if | |
1546 | var_name is a shell function only. */ | |
726f6388 JA |
1547 | char * |
1548 | get_string_value (var_name) | |
28ef6c31 | 1549 | const char *var_name; |
726f6388 | 1550 | { |
d166f048 JA |
1551 | SHELL_VAR *var; |
1552 | ||
f73dda09 | 1553 | var = find_variable (var_name); |
7117c2d2 | 1554 | return ((var) ? get_variable_value (var) : (char *)NULL); |
726f6388 JA |
1555 | } |
1556 | ||
b72432fd JA |
1557 | /* This is present for use by the tilde and readline libraries. */ |
1558 | char * | |
28ef6c31 JA |
1559 | sh_get_env_value (v) |
1560 | const char *v; | |
b72432fd JA |
1561 | { |
1562 | return get_string_value (v); | |
1563 | } | |
1564 | ||
7117c2d2 JA |
1565 | /* **************************************************************** */ |
1566 | /* */ | |
1567 | /* Creating and setting variables */ | |
1568 | /* */ | |
1569 | /* **************************************************************** */ | |
1570 | ||
1571 | /* Set NAME to VALUE if NAME has no value. */ | |
1572 | SHELL_VAR * | |
1573 | set_if_not (name, value) | |
1574 | char *name, *value; | |
1575 | { | |
1576 | SHELL_VAR *v; | |
1577 | ||
1578 | v = find_variable (name); | |
1579 | if (v == 0) | |
1580 | v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH); | |
1581 | return (v); | |
1582 | } | |
1583 | ||
726f6388 JA |
1584 | /* Create a local variable referenced by NAME. */ |
1585 | SHELL_VAR * | |
1586 | make_local_variable (name) | |
f73dda09 | 1587 | const char *name; |
726f6388 JA |
1588 | { |
1589 | SHELL_VAR *new_var, *old_var; | |
7117c2d2 JA |
1590 | VAR_CONTEXT *vc; |
1591 | int was_tmpvar; | |
1592 | char *tmp_value; | |
726f6388 JA |
1593 | |
1594 | /* local foo; local foo; is a no-op. */ | |
1595 | old_var = find_variable (name); | |
7117c2d2 | 1596 | if (old_var && local_p (old_var) && old_var->context == variable_context) |
726f6388 JA |
1597 | return (old_var); |
1598 | ||
7117c2d2 JA |
1599 | was_tmpvar = old_var && tempvar_p (old_var); |
1600 | if (was_tmpvar) | |
1601 | tmp_value = value_cell (old_var); | |
1602 | ||
1603 | for (vc = shell_variables; vc; vc = vc->down) | |
1604 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
1605 | break; | |
1606 | ||
1607 | if (vc == 0) | |
1608 | { | |
1609 | internal_error ("make_local_variable: no function context at current scope found"); | |
1610 | return ((SHELL_VAR *)NULL); | |
1611 | } | |
1612 | else if (vc->table == 0) | |
1613 | vc->table = hash_create (TEMPENV_HASH_BUCKETS); | |
1614 | ||
bb70624e JA |
1615 | /* Since this is called only from the local/declare/typeset code, we can |
1616 | call builtin_error here without worry (of course, it will also work | |
28ef6c31 JA |
1617 | for anything that sets this_command_name). Variables with the `noassign' |
1618 | attribute may not be made local. The test against old_var's context | |
1619 | level is to disallow local copies of readonly global variables (since I | |
1620 | believe that this could be a security hole). Readonly copies of calling | |
1621 | function local variables are OK. */ | |
1622 | if (old_var && (noassign_p (old_var) || | |
1623 | (readonly_p (old_var) && old_var->context == 0))) | |
1624 | { | |
1625 | if (readonly_p (old_var)) | |
7117c2d2 | 1626 | sh_readonly (name); |
bb70624e JA |
1627 | return ((SHELL_VAR *)NULL); |
1628 | } | |
1629 | ||
d166f048 | 1630 | if (old_var == 0) |
7117c2d2 | 1631 | new_var = bind_variable_internal (name, "", vc->table, HASH_NOSRCH); |
726f6388 JA |
1632 | else |
1633 | { | |
7117c2d2 | 1634 | new_var = make_new_variable (name, vc->table); |
726f6388 | 1635 | |
7117c2d2 JA |
1636 | /* If we found this variable in one of the temporary environments, |
1637 | inherit its value. Watch to see if this causes problems with | |
1638 | things like `x=4 local x'. */ | |
1639 | if (was_tmpvar) | |
1640 | var_setvalue (new_var, savestring (tmp_value)); | |
726f6388 | 1641 | |
ccc6cda3 | 1642 | new_var->attributes = exported_p (old_var) ? att_exported : 0; |
726f6388 JA |
1643 | } |
1644 | ||
7117c2d2 JA |
1645 | vc->flags |= VC_HASLOCAL; |
1646 | ||
726f6388 | 1647 | new_var->context = variable_context; |
bb70624e | 1648 | VSETATTR (new_var, att_local); |
726f6388 | 1649 | |
7117c2d2 JA |
1650 | if (ifsname (name)) |
1651 | setifs (new_var); | |
726f6388 JA |
1652 | |
1653 | return (new_var); | |
1654 | } | |
1655 | ||
ccc6cda3 | 1656 | #if defined (ARRAY_VARS) |
726f6388 | 1657 | SHELL_VAR * |
ccc6cda3 JA |
1658 | make_local_array_variable (name) |
1659 | char *name; | |
1660 | { | |
1661 | SHELL_VAR *var; | |
1662 | ARRAY *array; | |
1663 | ||
1664 | var = make_local_variable (name); | |
bb70624e JA |
1665 | if (var == 0) |
1666 | return var; | |
7117c2d2 | 1667 | array = array_create (); |
ccc6cda3 JA |
1668 | |
1669 | FREE (value_cell(var)); | |
7117c2d2 | 1670 | var_setarray (var, array); |
bb70624e | 1671 | VSETATTR (var, att_array); |
ccc6cda3 JA |
1672 | return var; |
1673 | } | |
1674 | #endif /* ARRAY_VARS */ | |
1675 | ||
7117c2d2 | 1676 | /* Create a new shell variable with name NAME. */ |
f73dda09 | 1677 | static SHELL_VAR * |
7117c2d2 | 1678 | new_shell_variable (name) |
f73dda09 | 1679 | const char *name; |
726f6388 | 1680 | { |
ccc6cda3 | 1681 | SHELL_VAR *entry; |
726f6388 | 1682 | |
ccc6cda3 | 1683 | entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); |
726f6388 | 1684 | |
ccc6cda3 | 1685 | entry->name = savestring (name); |
7117c2d2 | 1686 | var_setvalue (entry, (char *)NULL); |
bb70624e | 1687 | CLEAR_EXPORTSTR (entry); |
726f6388 | 1688 | |
7117c2d2 JA |
1689 | entry->dynamic_value = (sh_var_value_func_t *)NULL; |
1690 | entry->assign_func = (sh_var_assign_func_t *)NULL; | |
1691 | ||
1692 | entry->attributes = 0; | |
ccc6cda3 JA |
1693 | |
1694 | /* Always assume variables are to be made at toplevel! | |
1695 | make_local_variable has the responsibilty of changing the | |
1696 | variable context. */ | |
1697 | entry->context = 0; | |
7117c2d2 JA |
1698 | |
1699 | return (entry); | |
1700 | } | |
1701 | ||
1702 | /* Create a new shell variable with name NAME and add it to the hash table | |
1703 | TABLE. */ | |
1704 | static SHELL_VAR * | |
1705 | make_new_variable (name, table) | |
1706 | const char *name; | |
1707 | HASH_TABLE *table; | |
1708 | { | |
1709 | SHELL_VAR *entry; | |
1710 | BUCKET_CONTENTS *elt; | |
1711 | ||
1712 | entry = new_shell_variable (name); | |
ccc6cda3 | 1713 | |
28ef6c31 JA |
1714 | /* Make sure we have a shell_variables hash table to add to. */ |
1715 | if (shell_variables == 0) | |
7117c2d2 JA |
1716 | { |
1717 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
1718 | shell_variables->scope = 0; | |
1719 | shell_variables->table = hash_create (0); | |
1720 | } | |
28ef6c31 | 1721 | |
7117c2d2 JA |
1722 | elt = hash_insert (savestring (name), table, HASH_NOSRCH); |
1723 | elt->data = (PTR_T)entry; | |
ccc6cda3 JA |
1724 | |
1725 | return entry; | |
1726 | } | |
1727 | ||
1728 | #if defined (ARRAY_VARS) | |
1729 | SHELL_VAR * | |
1730 | make_new_array_variable (name) | |
1731 | char *name; | |
1732 | { | |
1733 | SHELL_VAR *entry; | |
1734 | ARRAY *array; | |
1735 | ||
7117c2d2 JA |
1736 | entry = make_new_variable (name, global_variables->table); |
1737 | array = array_create (); | |
1738 | var_setarray (entry, array); | |
bb70624e | 1739 | VSETATTR (entry, att_array); |
ccc6cda3 JA |
1740 | return entry; |
1741 | } | |
1742 | #endif | |
1743 | ||
1744 | char * | |
1745 | make_variable_value (var, value) | |
1746 | SHELL_VAR *var; | |
1747 | char *value; | |
1748 | { | |
1749 | char *retval; | |
7117c2d2 | 1750 | intmax_t lval; |
d166f048 | 1751 | int expok; |
ccc6cda3 JA |
1752 | |
1753 | /* If this variable has had its type set to integer (via `declare -i'), | |
1754 | then do expression evaluation on it and store the result. The | |
7117c2d2 | 1755 | functions in expr.c (evalexp()) and bind_int_variable() are responsible |
ccc6cda3 JA |
1756 | for turning off the integer flag if they don't want further |
1757 | evaluation done. */ | |
1758 | if (integer_p (var)) | |
1759 | { | |
d166f048 JA |
1760 | lval = evalexp (value, &expok); |
1761 | if (expok == 0) | |
1762 | jump_to_top_level (DISCARD); | |
ccc6cda3 JA |
1763 | retval = itos (lval); |
1764 | } | |
1765 | else if (value) | |
1766 | { | |
1767 | if (*value) | |
1768 | retval = savestring (value); | |
1769 | else | |
726f6388 | 1770 | { |
f73dda09 | 1771 | retval = (char *)xmalloc (1); |
ccc6cda3 | 1772 | retval[0] = '\0'; |
726f6388 | 1773 | } |
ccc6cda3 JA |
1774 | } |
1775 | else | |
1776 | retval = (char *)NULL; | |
726f6388 | 1777 | |
ccc6cda3 JA |
1778 | return retval; |
1779 | } | |
726f6388 | 1780 | |
7117c2d2 JA |
1781 | /* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the |
1782 | temporary environment (but usually is not). */ | |
1783 | static SHELL_VAR * | |
1784 | bind_variable_internal (name, value, table, hflags) | |
f73dda09 JA |
1785 | const char *name; |
1786 | char *value; | |
7117c2d2 JA |
1787 | HASH_TABLE *table; |
1788 | int hflags; | |
ccc6cda3 JA |
1789 | { |
1790 | char *newval; | |
7117c2d2 | 1791 | SHELL_VAR *entry; |
28ef6c31 | 1792 | |
7117c2d2 | 1793 | entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table); |
ccc6cda3 JA |
1794 | |
1795 | if (entry == 0) | |
1796 | { | |
7117c2d2 JA |
1797 | entry = make_new_variable (name, table); |
1798 | var_setvalue (entry, make_variable_value (entry, value)); | |
726f6388 | 1799 | } |
28ef6c31 | 1800 | else if (entry->assign_func) /* array vars have assign functions now */ |
bb70624e JA |
1801 | { |
1802 | INVALIDATE_EXPORTSTR (entry); | |
7117c2d2 | 1803 | return ((*(entry->assign_func)) (entry, value, -1)); |
bb70624e | 1804 | } |
726f6388 JA |
1805 | else |
1806 | { | |
28ef6c31 | 1807 | if (readonly_p (entry) || noassign_p (entry)) |
726f6388 | 1808 | { |
28ef6c31 | 1809 | if (readonly_p (entry)) |
7117c2d2 | 1810 | err_readonly (name); |
726f6388 JA |
1811 | return (entry); |
1812 | } | |
1813 | ||
1814 | /* Variables which are bound are visible. */ | |
bb70624e | 1815 | VUNSETATTR (entry, att_invisible); |
726f6388 | 1816 | |
ccc6cda3 | 1817 | newval = make_variable_value (entry, value); |
726f6388 | 1818 | |
bb70624e JA |
1819 | /* Invalidate any cached export string */ |
1820 | INVALIDATE_EXPORTSTR (entry); | |
1821 | ||
ccc6cda3 JA |
1822 | #if defined (ARRAY_VARS) |
1823 | /* XXX -- this bears looking at again -- XXX */ | |
1824 | /* If an existing array variable x is being assigned to with x=b or | |
1825 | `read x' or something of that nature, silently convert it to | |
1826 | x[0]=b or `read x[0]'. */ | |
1827 | if (array_p (entry)) | |
d166f048 | 1828 | { |
7117c2d2 | 1829 | array_insert (array_cell (entry), 0, newval); |
d166f048 JA |
1830 | free (newval); |
1831 | } | |
726f6388 | 1832 | else |
f73dda09 | 1833 | #endif |
726f6388 | 1834 | { |
7117c2d2 JA |
1835 | FREE (value_cell (entry)); |
1836 | var_setvalue (entry, newval); | |
726f6388 JA |
1837 | } |
1838 | } | |
1839 | ||
1840 | if (mark_modified_vars) | |
bb70624e | 1841 | VSETATTR (entry, att_exported); |
726f6388 JA |
1842 | |
1843 | if (exported_p (entry)) | |
1844 | array_needs_making = 1; | |
1845 | ||
1846 | return (entry); | |
1847 | } | |
7117c2d2 JA |
1848 | |
1849 | /* Bind a variable NAME to VALUE. This conses up the name | |
1850 | and value strings. If we have a temporary environment, we bind there | |
1851 | first, then we bind into shell_variables. */ | |
1852 | ||
1853 | SHELL_VAR * | |
1854 | bind_variable (name, value) | |
1855 | const char *name; | |
1856 | char *value; | |
1857 | { | |
1858 | SHELL_VAR *v; | |
1859 | VAR_CONTEXT *vc; | |
1860 | ||
1861 | if (shell_variables == 0) | |
1862 | { | |
1863 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
1864 | shell_variables->scope = 0; | |
1865 | shell_variables->table = hash_create (0); | |
1866 | } | |
1867 | ||
1868 | /* If we have a temporary environment, look there first for the variable, | |
1869 | and, if found, modify the value there before modifying it in the | |
1870 | shell_variables table. This allows sourced scripts to modify values | |
1871 | given to them in a temporary environment while modifying the variable | |
1872 | value that the caller sees. */ | |
1873 | if (temporary_env) | |
1874 | bind_tempenv_variable (name, value); | |
1875 | ||
1876 | /* XXX -- handle local variables here. */ | |
1877 | for (vc = shell_variables; vc; vc = vc->down) | |
1878 | { | |
1879 | if (vc_isfuncenv (vc) || vc_isbltnenv (vc)) | |
1880 | { | |
1881 | v = hash_lookup (name, vc->table); | |
1882 | if (v) | |
1883 | return (bind_variable_internal (name, value, vc->table, 0)); | |
1884 | } | |
1885 | } | |
1886 | return (bind_variable_internal (name, value, global_variables->table, 0)); | |
1887 | } | |
726f6388 | 1888 | |
bb70624e JA |
1889 | /* Make VAR, a simple shell variable, have value VALUE. Once assigned a |
1890 | value, variables are no longer invisible. This is a duplicate of part | |
1891 | of the internals of bind_variable. If the variable is exported, or | |
1892 | all modified variables should be exported, mark the variable for export | |
1893 | and note that the export environment needs to be recreated. */ | |
1894 | SHELL_VAR * | |
1895 | bind_variable_value (var, value) | |
1896 | SHELL_VAR *var; | |
1897 | char *value; | |
1898 | { | |
1899 | char *t; | |
1900 | ||
1901 | VUNSETATTR (var, att_invisible); | |
1902 | ||
1903 | t = make_variable_value (var, value); | |
7117c2d2 JA |
1904 | FREE (value_cell (var)); |
1905 | var_setvalue (var, t); | |
bb70624e JA |
1906 | |
1907 | INVALIDATE_EXPORTSTR (var); | |
1908 | ||
1909 | if (mark_modified_vars) | |
1910 | VSETATTR (var, att_exported); | |
1911 | ||
1912 | if (exported_p (var)) | |
1913 | array_needs_making = 1; | |
1914 | ||
1915 | return (var); | |
1916 | } | |
1917 | ||
1918 | /* Bind/create a shell variable with the name LHS to the RHS. | |
1919 | This creates or modifies a variable such that it is an integer. | |
1920 | ||
1921 | This used to be in expr.c, but it is here so that all of the | |
1922 | variable binding stuff is localized. Since we don't want any | |
1923 | recursive evaluation from bind_variable() (possible without this code, | |
1924 | since bind_variable() calls the evaluator for variables with the integer | |
1925 | attribute set), we temporarily turn off the integer attribute for each | |
1926 | variable we set here, then turn it back on after binding as necessary. */ | |
1927 | ||
1928 | SHELL_VAR * | |
1929 | bind_int_variable (lhs, rhs) | |
1930 | char *lhs, *rhs; | |
1931 | { | |
1932 | register SHELL_VAR *v; | |
7117c2d2 JA |
1933 | char *t; |
1934 | int isint, isarr; | |
1935 | ||
1936 | isint = isarr = 0; | |
1937 | #if defined (ARRAY_VARS) | |
d3a24ed2 | 1938 | # if 0 |
7117c2d2 | 1939 | if (t = xstrchr (lhs, '[')) /*]*/ |
d3a24ed2 CR |
1940 | # else |
1941 | if (valid_array_reference (lhs)) | |
1942 | # endif | |
7117c2d2 JA |
1943 | { |
1944 | isarr = 1; | |
1945 | v = array_variable_part (lhs, (char **)0, (int *)0); | |
1946 | } | |
1947 | else | |
1948 | #endif | |
1949 | v = find_variable (lhs); | |
bb70624e | 1950 | |
bb70624e JA |
1951 | if (v) |
1952 | { | |
1953 | isint = integer_p (v); | |
1954 | VUNSETATTR (v, att_integer); | |
1955 | } | |
1956 | ||
7117c2d2 JA |
1957 | #if defined (ARRAY_VARS) |
1958 | if (isarr) | |
1959 | v = assign_array_element (lhs, rhs); | |
1960 | else | |
1961 | #endif | |
1962 | v = bind_variable (lhs, rhs); | |
1963 | ||
bb70624e JA |
1964 | if (isint) |
1965 | VSETATTR (v, att_integer); | |
1966 | ||
1967 | return (v); | |
1968 | } | |
1969 | ||
ccc6cda3 | 1970 | SHELL_VAR * |
f73dda09 JA |
1971 | bind_var_to_int (var, val) |
1972 | char *var; | |
7117c2d2 | 1973 | intmax_t val; |
ccc6cda3 | 1974 | { |
7117c2d2 | 1975 | char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p; |
ccc6cda3 | 1976 | |
f73dda09 JA |
1977 | p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0); |
1978 | return (bind_int_variable (var, p)); | |
ccc6cda3 JA |
1979 | } |
1980 | ||
7117c2d2 JA |
1981 | /* Do a function binding to a variable. You pass the name and |
1982 | the command to bind to. This conses the name and command. */ | |
1983 | SHELL_VAR * | |
1984 | bind_function (name, value) | |
1985 | const char *name; | |
1986 | COMMAND *value; | |
1987 | { | |
1988 | SHELL_VAR *entry; | |
1989 | ||
1990 | entry = find_function (name); | |
1991 | if (entry == 0) | |
1992 | { | |
1993 | BUCKET_CONTENTS *elt; | |
1994 | ||
1995 | elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH); | |
1996 | entry = new_shell_variable (name); | |
1997 | elt->data = (PTR_T)entry; | |
1998 | } | |
1999 | else | |
2000 | INVALIDATE_EXPORTSTR (entry); | |
2001 | ||
2002 | if (var_isset (entry)) | |
2003 | dispose_command (function_cell (entry)); | |
2004 | ||
2005 | if (value) | |
2006 | var_setfunc (entry, copy_command (value)); | |
2007 | else | |
2008 | var_setfunc (entry, 0); | |
2009 | ||
2010 | VSETATTR (entry, att_function); | |
2011 | ||
2012 | if (mark_modified_vars) | |
2013 | VSETATTR (entry, att_exported); | |
2014 | ||
2015 | VUNSETATTR (entry, att_invisible); /* Just to be sure */ | |
2016 | ||
2017 | if (exported_p (entry)) | |
2018 | array_needs_making = 1; | |
2019 | ||
2020 | #if defined (PROGRAMMABLE_COMPLETION) | |
2021 | set_itemlist_dirty (&it_functions); | |
2022 | #endif | |
2023 | ||
2024 | return (entry); | |
2025 | } | |
2026 | ||
d3a24ed2 CR |
2027 | /* Bind a function definition, which includes source file and line number |
2028 | information in addition to the command, into the FUNCTION_DEF hash table.*/ | |
2029 | void | |
2030 | bind_function_def (name, value) | |
2031 | const char *name; | |
2032 | FUNCTION_DEF *value; | |
2033 | { | |
2034 | FUNCTION_DEF *entry; | |
2035 | BUCKET_CONTENTS *elt; | |
2036 | ||
2037 | entry = find_function_def (name); | |
2038 | if (entry) | |
2039 | { | |
2040 | dispose_function_def_contents (entry); | |
2041 | entry = copy_function_def_contents (value, entry); | |
2042 | } | |
2043 | else | |
2044 | { | |
2045 | entry = copy_function_def (value); | |
2046 | ||
2047 | elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH); | |
2048 | elt->data = (PTR_T *)entry; | |
2049 | } | |
2050 | } | |
2051 | ||
7117c2d2 JA |
2052 | /* Add STRING, which is of the form foo=bar, to the temporary environment |
2053 | HASH_TABLE (temporary_env). The functions in execute_cmd.c are | |
2054 | responsible for moving the main temporary env to one of the other | |
2055 | temporary environments. The expansion code in subst.c calls this. */ | |
2056 | int | |
2057 | assign_in_env (string) | |
2058 | const char *string; | |
2059 | { | |
2060 | int offset; | |
2061 | char *name, *temp, *value; | |
2062 | SHELL_VAR *var; | |
2063 | ||
2064 | offset = assignment (string); | |
2065 | name = savestring (string); | |
2066 | value = (char *)NULL; | |
2067 | ||
2068 | if (name[offset] == '=') | |
2069 | { | |
2070 | name[offset] = 0; | |
2071 | ||
2072 | var = find_variable (name); | |
2073 | if (var && (readonly_p (var) || noassign_p (var))) | |
2074 | { | |
2075 | if (readonly_p (var)) | |
2076 | err_readonly (name); | |
2077 | free (name); | |
2078 | return (0); | |
2079 | } | |
2080 | ||
2081 | temp = name + offset + 1; | |
2082 | temp = (xstrchr (temp, '~') != 0) ? bash_tilde_expand (temp, 1) : savestring (temp); | |
2083 | ||
2084 | value = expand_string_unsplit_to_string (temp, 0); | |
2085 | free (temp); | |
2086 | } | |
2087 | ||
2088 | if (temporary_env == 0) | |
2089 | temporary_env = hash_create (TEMPENV_HASH_BUCKETS); | |
2090 | ||
2091 | var = hash_lookup (name, temporary_env); | |
2092 | if (var == 0) | |
2093 | var = make_new_variable (name, temporary_env); | |
2094 | else | |
2095 | FREE (value_cell (var)); | |
2096 | ||
2097 | if (value == 0) | |
2098 | { | |
2099 | value = (char *)xmalloc (1); /* like do_assignment_internal */ | |
2100 | value[0] = '\0'; | |
2101 | } | |
2102 | ||
2103 | var_setvalue (var, value); | |
2104 | var->attributes |= (att_exported|att_tempvar); | |
2105 | var->context = variable_context; /* XXX */ | |
2106 | ||
2107 | INVALIDATE_EXPORTSTR (var); | |
2108 | var->exportstr = mk_env_string (name, value); | |
2109 | ||
2110 | array_needs_making = 1; | |
2111 | ||
2112 | if (ifsname (name)) | |
2113 | setifs (var); | |
2114 | ||
2115 | if (echo_command_at_execute) | |
2116 | { | |
2117 | /* The Korn shell prints the `+ ' in front of assignment statements, | |
2118 | so we do too. */ | |
2119 | fprintf (stderr, "%s%s=%s\n", indirection_level_string (), name, value); | |
2120 | fflush (stderr); | |
2121 | } | |
2122 | ||
2123 | return 1; | |
2124 | } | |
2125 | ||
2126 | /* **************************************************************** */ | |
2127 | /* */ | |
2128 | /* Copying variables */ | |
2129 | /* */ | |
2130 | /* **************************************************************** */ | |
2131 | ||
2132 | #ifdef INCLUDE_UNUSED | |
2133 | /* Copy VAR to a new data structure and return that structure. */ | |
2134 | SHELL_VAR * | |
2135 | copy_variable (var) | |
2136 | SHELL_VAR *var; | |
2137 | { | |
2138 | SHELL_VAR *copy = (SHELL_VAR *)NULL; | |
2139 | ||
2140 | if (var) | |
2141 | { | |
2142 | copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); | |
2143 | ||
2144 | copy->attributes = var->attributes; | |
2145 | copy->name = savestring (var->name); | |
2146 | ||
2147 | if (function_p (var)) | |
2148 | var_setfunc (copy, copy_command (function_cell (var))); | |
2149 | #if defined (ARRAY_VARS) | |
2150 | else if (array_p (var)) | |
2151 | var_setarray (copy, dup_array (array_cell (var))); | |
2152 | #endif | |
2153 | else if (value_cell (var)) | |
2154 | var_setvalue (copy, savestring (value_cell (var))); | |
2155 | else | |
2156 | var_setvalue (copy, (char *)NULL); | |
2157 | ||
2158 | copy->dynamic_value = var->dynamic_value; | |
2159 | copy->assign_func = var->assign_func; | |
2160 | ||
2161 | copy->exportstr = COPY_EXPORTSTR (var); | |
2162 | ||
2163 | copy->context = var->context; | |
2164 | } | |
2165 | return (copy); | |
2166 | } | |
2167 | #endif | |
2168 | ||
2169 | /* **************************************************************** */ | |
2170 | /* */ | |
2171 | /* Deleting and unsetting variables */ | |
2172 | /* */ | |
2173 | /* **************************************************************** */ | |
2174 | ||
726f6388 JA |
2175 | /* Dispose of the information attached to VAR. */ |
2176 | void | |
2177 | dispose_variable (var) | |
2178 | SHELL_VAR *var; | |
2179 | { | |
7117c2d2 | 2180 | if (var == 0) |
726f6388 JA |
2181 | return; |
2182 | ||
2183 | if (function_p (var)) | |
ccc6cda3 JA |
2184 | dispose_command (function_cell (var)); |
2185 | #if defined (ARRAY_VARS) | |
2186 | else if (array_p (var)) | |
7117c2d2 | 2187 | array_dispose (array_cell (var)); |
ccc6cda3 JA |
2188 | #endif |
2189 | else | |
2190 | FREE (value_cell (var)); | |
726f6388 | 2191 | |
bb70624e JA |
2192 | FREE_EXPORTSTR (var); |
2193 | ||
726f6388 JA |
2194 | free (var->name); |
2195 | ||
2196 | if (exported_p (var)) | |
2197 | array_needs_making = 1; | |
2198 | ||
2199 | free (var); | |
2200 | } | |
2201 | ||
7117c2d2 | 2202 | /* Unset the shell variable referenced by NAME. */ |
ccc6cda3 | 2203 | int |
726f6388 | 2204 | unbind_variable (name) |
f73dda09 | 2205 | const char *name; |
726f6388 | 2206 | { |
7117c2d2 JA |
2207 | return makunbound (name, shell_variables); |
2208 | } | |
726f6388 | 2209 | |
7117c2d2 JA |
2210 | /* Unset the shell function named NAME. */ |
2211 | int | |
2212 | unbind_func (name) | |
2213 | const char *name; | |
2214 | { | |
2215 | BUCKET_CONTENTS *elt; | |
2216 | SHELL_VAR *func; | |
726f6388 | 2217 | |
7117c2d2 JA |
2218 | elt = hash_remove (name, shell_functions, 0); |
2219 | ||
2220 | if (elt == 0) | |
2221 | return -1; | |
2222 | ||
2223 | #if defined (PROGRAMMABLE_COMPLETION) | |
2224 | set_itemlist_dirty (&it_functions); | |
ccc6cda3 | 2225 | #endif |
7117c2d2 JA |
2226 | |
2227 | func = (SHELL_VAR *)elt->data; | |
2228 | if (func) | |
726f6388 | 2229 | { |
7117c2d2 JA |
2230 | if (exported_p (func)) |
2231 | array_needs_making++; | |
2232 | dispose_variable (func); | |
726f6388 JA |
2233 | } |
2234 | ||
7117c2d2 JA |
2235 | free (elt->key); |
2236 | free (elt); | |
726f6388 | 2237 | |
7117c2d2 | 2238 | return 0; |
726f6388 JA |
2239 | } |
2240 | ||
d3a24ed2 CR |
2241 | int |
2242 | unbind_function_def (name) | |
2243 | const char *name; | |
2244 | { | |
2245 | BUCKET_CONTENTS *elt; | |
2246 | FUNCTION_DEF *funcdef; | |
2247 | ||
2248 | elt = hash_remove (name, shell_function_defs, 0); | |
2249 | ||
2250 | if (elt == 0) | |
2251 | return -1; | |
2252 | ||
2253 | funcdef = (FUNCTION_DEF *)elt->data; | |
2254 | if (funcdef) | |
2255 | dispose_function_def (funcdef); | |
2256 | ||
2257 | free (elt->key); | |
2258 | free (elt); | |
2259 | ||
2260 | return 0; | |
2261 | } | |
2262 | ||
726f6388 JA |
2263 | /* Make the variable associated with NAME go away. HASH_LIST is the |
2264 | hash table from which this variable should be deleted (either | |
2265 | shell_variables or shell_functions). | |
2266 | Returns non-zero if the variable couldn't be found. */ | |
ccc6cda3 | 2267 | int |
7117c2d2 | 2268 | makunbound (name, vc) |
f73dda09 | 2269 | const char *name; |
7117c2d2 | 2270 | VAR_CONTEXT *vc; |
726f6388 | 2271 | { |
d166f048 | 2272 | BUCKET_CONTENTS *elt, *new_elt; |
7117c2d2 JA |
2273 | SHELL_VAR *old_var; |
2274 | VAR_CONTEXT *v; | |
726f6388 JA |
2275 | char *t; |
2276 | ||
7117c2d2 JA |
2277 | for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down) |
2278 | if (elt = hash_remove (name, v->table, 0)) | |
2279 | break; | |
726f6388 | 2280 | |
d166f048 | 2281 | if (elt == 0) |
726f6388 JA |
2282 | return (-1); |
2283 | ||
2284 | old_var = (SHELL_VAR *)elt->data; | |
726f6388 JA |
2285 | |
2286 | if (old_var && exported_p (old_var)) | |
2287 | array_needs_making++; | |
2288 | ||
ccc6cda3 | 2289 | /* If we're unsetting a local variable and we're still executing inside |
7117c2d2 JA |
2290 | the function, just mark the variable as invisible. The function |
2291 | eventually called by pop_var_context() will clean it up later. This | |
2292 | must be done so that if the variable is subsequently assigned a new | |
2293 | value inside the function, the `local' attribute is still present. | |
2294 | We also need to add it back into the correct hash table. */ | |
ccc6cda3 JA |
2295 | if (old_var && local_p (old_var) && variable_context == old_var->context) |
2296 | { | |
bb70624e | 2297 | VSETATTR (old_var, att_invisible); |
7117c2d2 JA |
2298 | FREE (value_cell (old_var)); |
2299 | var_setvalue (old_var, (char *)NULL); | |
bb70624e | 2300 | INVALIDATE_EXPORTSTR (old_var); |
7117c2d2 JA |
2301 | |
2302 | new_elt = hash_insert (savestring (old_var->name), v->table, 0); | |
2303 | new_elt->data = (PTR_T)old_var; | |
ccc6cda3 | 2304 | stupidly_hack_special_variables (old_var->name); |
7117c2d2 | 2305 | |
d166f048 JA |
2306 | free (elt->key); |
2307 | free (elt); | |
ccc6cda3 JA |
2308 | return (0); |
2309 | } | |
2310 | ||
726f6388 JA |
2311 | /* Have to save a copy of name here, because it might refer to |
2312 | old_var->name. If so, stupidly_hack_special_variables will | |
2313 | reference freed memory. */ | |
2314 | t = savestring (name); | |
2315 | ||
2316 | free (elt->key); | |
2317 | free (elt); | |
2318 | ||
2319 | dispose_variable (old_var); | |
2320 | stupidly_hack_special_variables (t); | |
2321 | free (t); | |
7117c2d2 | 2322 | |
726f6388 JA |
2323 | return (0); |
2324 | } | |
2325 | ||
7117c2d2 JA |
2326 | /* Get rid of all of the variables in the current context. */ |
2327 | void | |
2328 | kill_all_local_variables () | |
726f6388 | 2329 | { |
7117c2d2 JA |
2330 | VAR_CONTEXT *vc; |
2331 | ||
2332 | for (vc = shell_variables; vc; vc = vc->down) | |
2333 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
2334 | break; | |
2335 | if (vc == 0) | |
2336 | return; /* XXX */ | |
726f6388 | 2337 | |
7117c2d2 | 2338 | if (vc->table && vc_haslocals (vc)) |
726f6388 | 2339 | { |
7117c2d2 JA |
2340 | delete_all_variables (vc->table); |
2341 | hash_dispose (vc->table); | |
726f6388 | 2342 | } |
7117c2d2 | 2343 | vc->table = (HASH_TABLE *)NULL; |
726f6388 JA |
2344 | } |
2345 | ||
ccc6cda3 JA |
2346 | static void |
2347 | free_variable_hash_data (data) | |
f73dda09 | 2348 | PTR_T data; |
ccc6cda3 | 2349 | { |
7117c2d2 | 2350 | SHELL_VAR *var; |
ccc6cda3 JA |
2351 | |
2352 | var = (SHELL_VAR *)data; | |
7117c2d2 | 2353 | dispose_variable (var); |
ccc6cda3 JA |
2354 | } |
2355 | ||
726f6388 JA |
2356 | /* Delete the entire contents of the hash table. */ |
2357 | void | |
2358 | delete_all_variables (hashed_vars) | |
2359 | HASH_TABLE *hashed_vars; | |
2360 | { | |
7117c2d2 | 2361 | hash_flush (hashed_vars, free_variable_hash_data); |
726f6388 JA |
2362 | } |
2363 | ||
7117c2d2 JA |
2364 | /* **************************************************************** */ |
2365 | /* */ | |
2366 | /* Setting variable attributes */ | |
2367 | /* */ | |
2368 | /* **************************************************************** */ | |
726f6388 | 2369 | |
ccc6cda3 JA |
2370 | #define FIND_OR_MAKE_VARIABLE(name, entry) \ |
2371 | do \ | |
2372 | { \ | |
2373 | entry = find_variable (name); \ | |
2374 | if (!entry) \ | |
2375 | { \ | |
2376 | entry = bind_variable (name, ""); \ | |
2377 | if (!no_invisible_vars) entry->attributes |= att_invisible; \ | |
2378 | } \ | |
2379 | } \ | |
2380 | while (0) | |
2381 | ||
2382 | /* Make the variable associated with NAME be readonly. | |
726f6388 JA |
2383 | If NAME does not exist yet, create it. */ |
2384 | void | |
2385 | set_var_read_only (name) | |
2386 | char *name; | |
2387 | { | |
ccc6cda3 | 2388 | SHELL_VAR *entry; |
726f6388 | 2389 | |
ccc6cda3 | 2390 | FIND_OR_MAKE_VARIABLE (name, entry); |
bb70624e | 2391 | VSETATTR (entry, att_readonly); |
726f6388 JA |
2392 | } |
2393 | ||
cce855bc | 2394 | #ifdef INCLUDE_UNUSED |
ccc6cda3 | 2395 | /* Make the function associated with NAME be readonly. |
726f6388 JA |
2396 | If NAME does not exist, we just punt, like auto_export code below. */ |
2397 | void | |
2398 | set_func_read_only (name) | |
f73dda09 | 2399 | const char *name; |
726f6388 | 2400 | { |
d166f048 | 2401 | SHELL_VAR *entry; |
726f6388 | 2402 | |
d166f048 | 2403 | entry = find_function (name); |
726f6388 | 2404 | if (entry) |
bb70624e | 2405 | VSETATTR (entry, att_readonly); |
726f6388 JA |
2406 | } |
2407 | ||
2408 | /* Make the variable associated with NAME be auto-exported. | |
2409 | If NAME does not exist yet, create it. */ | |
2410 | void | |
2411 | set_var_auto_export (name) | |
2412 | char *name; | |
2413 | { | |
ccc6cda3 | 2414 | SHELL_VAR *entry; |
726f6388 | 2415 | |
ccc6cda3 | 2416 | FIND_OR_MAKE_VARIABLE (name, entry); |
726f6388 JA |
2417 | set_auto_export (entry); |
2418 | } | |
2419 | ||
2420 | /* Make the function associated with NAME be auto-exported. */ | |
2421 | void | |
2422 | set_func_auto_export (name) | |
f73dda09 | 2423 | const char *name; |
726f6388 | 2424 | { |
ccc6cda3 | 2425 | SHELL_VAR *entry; |
726f6388 | 2426 | |
ccc6cda3 | 2427 | entry = find_function (name); |
726f6388 | 2428 | if (entry) |
ccc6cda3 JA |
2429 | set_auto_export (entry); |
2430 | } | |
cce855bc | 2431 | #endif |
ccc6cda3 | 2432 | |
7117c2d2 JA |
2433 | /* **************************************************************** */ |
2434 | /* */ | |
2435 | /* Creating lists of variables */ | |
2436 | /* */ | |
2437 | /* **************************************************************** */ | |
2438 | ||
2439 | static VARLIST * | |
2440 | vlist_alloc (nentries) | |
2441 | int nentries; | |
726f6388 | 2442 | { |
7117c2d2 | 2443 | VARLIST *vlist; |
726f6388 | 2444 | |
7117c2d2 JA |
2445 | vlist = (VARLIST *)xmalloc (sizeof (VARLIST)); |
2446 | vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *)); | |
2447 | vlist->list_size = nentries; | |
2448 | vlist->list_len = 0; | |
2449 | vlist->list[0] = (SHELL_VAR *)NULL; | |
726f6388 | 2450 | |
7117c2d2 JA |
2451 | return vlist; |
2452 | } | |
726f6388 | 2453 | |
7117c2d2 JA |
2454 | static VARLIST * |
2455 | vlist_realloc (vlist, n) | |
2456 | VARLIST *vlist; | |
2457 | int n; | |
2458 | { | |
2459 | if (vlist == 0) | |
2460 | return (vlist = vlist_alloc (n)); | |
2461 | if (n > vlist->list_size) | |
726f6388 | 2462 | { |
7117c2d2 JA |
2463 | vlist->list_size = n; |
2464 | vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *)); | |
2465 | } | |
2466 | return vlist; | |
2467 | } | |
726f6388 | 2468 | |
7117c2d2 JA |
2469 | static void |
2470 | vlist_add (vlist, var, flags) | |
2471 | VARLIST *vlist; | |
2472 | SHELL_VAR *var; | |
2473 | int flags; | |
2474 | { | |
2475 | register int i; | |
ccc6cda3 | 2476 | |
7117c2d2 JA |
2477 | for (i = 0; i < vlist->list_len; i++) |
2478 | if (STREQ (var->name, vlist->list[i]->name)) | |
2479 | break; | |
2480 | if (i < vlist->list_len) | |
2481 | return; | |
2482 | ||
2483 | if (i >= vlist->list_size) | |
2484 | vlist = vlist_realloc (vlist, vlist->list_size + 16); | |
726f6388 | 2485 | |
7117c2d2 JA |
2486 | vlist->list[vlist->list_len++] = var; |
2487 | vlist->list[vlist->list_len] = (SHELL_VAR *)NULL; | |
2488 | } | |
2489 | ||
2490 | /* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the | |
2491 | variables for which FUNCTION returns a non-zero value. A NULL value | |
2492 | for FUNCTION means to use all variables. */ | |
2493 | SHELL_VAR ** | |
2494 | map_over (function, vc) | |
2495 | sh_var_map_func_t *function; | |
2496 | VAR_CONTEXT *vc; | |
2497 | { | |
2498 | VAR_CONTEXT *v; | |
2499 | VARLIST *vlist; | |
2500 | SHELL_VAR **ret; | |
2501 | int nentries; | |
2502 | ||
2503 | for (nentries = 0, v = vc; v; v = v->down) | |
2504 | nentries += HASH_ENTRIES (v->table); | |
2505 | ||
2506 | if (nentries == 0) | |
2507 | return (SHELL_VAR **)NULL; | |
2508 | ||
2509 | vlist = vlist_alloc (nentries); | |
2510 | ||
2511 | for (v = vc; v; v = v->down) | |
2512 | flatten (v->table, function, vlist, 0); | |
2513 | ||
2514 | ret = vlist->list; | |
2515 | free (vlist); | |
2516 | return ret; | |
2517 | } | |
2518 | ||
2519 | SHELL_VAR ** | |
2520 | map_over_funcs (function) | |
2521 | sh_var_map_func_t *function; | |
2522 | { | |
2523 | VARLIST *vlist; | |
2524 | SHELL_VAR **ret; | |
2525 | ||
2526 | if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0) | |
2527 | return ((SHELL_VAR **)NULL); | |
2528 | ||
2529 | vlist = vlist_alloc (HASH_ENTRIES (shell_functions)); | |
2530 | ||
2531 | flatten (shell_functions, function, vlist, 0); | |
2532 | ||
2533 | ret = vlist->list; | |
2534 | free (vlist); | |
2535 | return ret; | |
2536 | } | |
2537 | ||
2538 | /* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those | |
2539 | elements for which FUNC succeeds to VLIST->list. FLAGS is reserved | |
2540 | for future use. Only unique names are added to VLIST. If FUNC is | |
2541 | NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is | |
2542 | NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST | |
2543 | and FUNC are both NULL, nothing happens. */ | |
2544 | static void | |
2545 | flatten (var_hash_table, func, vlist, flags) | |
2546 | HASH_TABLE *var_hash_table; | |
2547 | sh_var_map_func_t *func; | |
2548 | VARLIST *vlist; | |
2549 | int flags; | |
2550 | { | |
2551 | register int i; | |
2552 | register BUCKET_CONTENTS *tlist; | |
2553 | int r; | |
2554 | SHELL_VAR *var; | |
2555 | ||
2556 | if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0)) | |
2557 | return; | |
2558 | ||
2559 | for (i = 0; i < var_hash_table->nbuckets; i++) | |
2560 | { | |
2561 | for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next) | |
2562 | { | |
2563 | var = (SHELL_VAR *)tlist->data; | |
2564 | ||
2565 | r = func ? (*func) (var) : 1; | |
2566 | if (r && vlist) | |
2567 | vlist_add (vlist, var, flags); | |
2568 | } | |
726f6388 | 2569 | } |
7117c2d2 JA |
2570 | } |
2571 | ||
2572 | void | |
2573 | sort_variables (array) | |
2574 | SHELL_VAR **array; | |
2575 | { | |
2576 | qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp); | |
726f6388 JA |
2577 | } |
2578 | ||
2579 | static int | |
7117c2d2 JA |
2580 | qsort_var_comp (var1, var2) |
2581 | SHELL_VAR **var1, **var2; | |
726f6388 | 2582 | { |
7117c2d2 JA |
2583 | int result; |
2584 | ||
2585 | if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0) | |
2586 | result = strcmp ((*var1)->name, (*var2)->name); | |
2587 | ||
2588 | return (result); | |
726f6388 JA |
2589 | } |
2590 | ||
7117c2d2 JA |
2591 | /* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for |
2592 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
ccc6cda3 | 2593 | static SHELL_VAR ** |
7117c2d2 JA |
2594 | vapply (func) |
2595 | sh_var_map_func_t *func; | |
726f6388 JA |
2596 | { |
2597 | SHELL_VAR **list; | |
2598 | ||
7117c2d2 | 2599 | list = map_over (func, shell_variables); |
d166f048 | 2600 | if (list /* && posixly_correct */) |
726f6388 | 2601 | sort_variables (list); |
7117c2d2 JA |
2602 | return (list); |
2603 | } | |
726f6388 | 2604 | |
7117c2d2 JA |
2605 | /* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for |
2606 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
2607 | static SHELL_VAR ** | |
2608 | fapply (func) | |
2609 | sh_var_map_func_t *func; | |
2610 | { | |
2611 | SHELL_VAR **list; | |
2612 | ||
2613 | list = map_over_funcs (func); | |
2614 | if (list /* && posixly_correct */) | |
2615 | sort_variables (list); | |
726f6388 JA |
2616 | return (list); |
2617 | } | |
2618 | ||
7117c2d2 JA |
2619 | /* Create a NULL terminated array of all the shell variables. */ |
2620 | SHELL_VAR ** | |
2621 | all_shell_variables () | |
2622 | { | |
2623 | return (vapply ((sh_var_map_func_t *)NULL)); | |
2624 | } | |
2625 | ||
2626 | /* Create a NULL terminated array of all the shell functions. */ | |
2627 | SHELL_VAR ** | |
2628 | all_shell_functions () | |
2629 | { | |
2630 | return (fapply ((sh_var_map_func_t *)NULL)); | |
2631 | } | |
2632 | ||
2633 | static int | |
2634 | visible_var (var) | |
2635 | SHELL_VAR *var; | |
2636 | { | |
2637 | return (invisible_p (var) == 0); | |
2638 | } | |
2639 | ||
726f6388 | 2640 | SHELL_VAR ** |
bb70624e | 2641 | all_visible_functions () |
726f6388 | 2642 | { |
7117c2d2 | 2643 | return (fapply (visible_var)); |
ccc6cda3 | 2644 | } |
726f6388 | 2645 | |
ccc6cda3 | 2646 | SHELL_VAR ** |
bb70624e | 2647 | all_visible_variables () |
ccc6cda3 | 2648 | { |
7117c2d2 | 2649 | return (vapply (visible_var)); |
726f6388 JA |
2650 | } |
2651 | ||
ccc6cda3 JA |
2652 | /* Return non-zero if the variable VAR is visible and exported. Array |
2653 | variables cannot be exported. */ | |
726f6388 JA |
2654 | static int |
2655 | visible_and_exported (var) | |
2656 | SHELL_VAR *var; | |
2657 | { | |
ccc6cda3 | 2658 | return (invisible_p (var) == 0 && exported_p (var)); |
726f6388 JA |
2659 | } |
2660 | ||
7117c2d2 JA |
2661 | /* Return non-zero if VAR is a local variable in the current context and |
2662 | is exported. */ | |
2663 | static int | |
2664 | local_and_exported (var) | |
2665 | SHELL_VAR *var; | |
2666 | { | |
2667 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var)); | |
2668 | } | |
2669 | ||
bb70624e JA |
2670 | SHELL_VAR ** |
2671 | all_exported_variables () | |
2672 | { | |
7117c2d2 JA |
2673 | return (vapply (visible_and_exported)); |
2674 | } | |
bb70624e | 2675 | |
7117c2d2 JA |
2676 | SHELL_VAR ** |
2677 | local_exported_variables () | |
2678 | { | |
2679 | return (vapply (local_and_exported)); | |
2680 | } | |
2681 | ||
2682 | static int | |
2683 | variable_in_context (var) | |
2684 | SHELL_VAR *var; | |
2685 | { | |
2686 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context); | |
2687 | } | |
2688 | ||
2689 | SHELL_VAR ** | |
2690 | all_local_variables () | |
2691 | { | |
2692 | VARLIST *vlist; | |
2693 | SHELL_VAR **ret; | |
2694 | VAR_CONTEXT *vc; | |
2695 | ||
2696 | vc = shell_variables; | |
2697 | for (vc = shell_variables; vc; vc = vc->down) | |
2698 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
2699 | break; | |
2700 | ||
2701 | if (vc == 0) | |
2702 | { | |
2703 | internal_error ("all_local_variables: no function context at current scope found"); | |
2704 | return (SHELL_VAR **)NULL; | |
2705 | } | |
2706 | if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0) | |
2707 | return (SHELL_VAR **)NULL; | |
2708 | ||
2709 | vlist = vlist_alloc (HASH_ENTRIES (vc->table)); | |
2710 | ||
2711 | flatten (vc->table, variable_in_context, vlist, 0); | |
2712 | ||
2713 | ret = vlist->list; | |
2714 | free (vlist); | |
2715 | if (ret) | |
2716 | sort_variables (ret); | |
2717 | return ret; | |
bb70624e JA |
2718 | } |
2719 | ||
2720 | #if defined (ARRAY_VARS) | |
2721 | /* Return non-zero if the variable VAR is visible and an array. */ | |
2722 | static int | |
2723 | visible_array_vars (var) | |
2724 | SHELL_VAR *var; | |
2725 | { | |
2726 | return (invisible_p (var) == 0 && array_p (var)); | |
2727 | } | |
2728 | ||
2729 | SHELL_VAR ** | |
2730 | all_array_variables () | |
2731 | { | |
7117c2d2 | 2732 | return (vapply (visible_array_vars)); |
bb70624e JA |
2733 | } |
2734 | #endif /* ARRAY_VARS */ | |
2735 | ||
2736 | char ** | |
2737 | all_variables_matching_prefix (prefix) | |
f73dda09 | 2738 | const char *prefix; |
bb70624e JA |
2739 | { |
2740 | SHELL_VAR **varlist; | |
2741 | char **rlist; | |
2742 | int vind, rind, plen; | |
2743 | ||
2744 | plen = STRLEN (prefix); | |
2745 | varlist = all_visible_variables (); | |
2746 | for (vind = 0; varlist && varlist[vind]; vind++) | |
2747 | ; | |
2748 | if (varlist == 0 || vind == 0) | |
2749 | return ((char **)NULL); | |
7117c2d2 | 2750 | rlist = strvec_create (vind + 1); |
bb70624e JA |
2751 | for (vind = rind = 0; varlist[vind]; vind++) |
2752 | { | |
2753 | if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen)) | |
28ef6c31 | 2754 | rlist[rind++] = savestring (varlist[vind]->name); |
bb70624e JA |
2755 | } |
2756 | rlist[rind] = (char *)0; | |
2757 | free (varlist); | |
2758 | ||
2759 | return rlist; | |
2760 | } | |
2761 | ||
7117c2d2 JA |
2762 | /* **************************************************************** */ |
2763 | /* */ | |
2764 | /* Managing temporary variable scopes */ | |
2765 | /* */ | |
2766 | /* **************************************************************** */ | |
2767 | ||
2768 | /* Make variable NAME have VALUE in the temporary environment. */ | |
2769 | static SHELL_VAR * | |
2770 | bind_tempenv_variable (name, value) | |
2771 | const char *name; | |
2772 | char *value; | |
2773 | { | |
2774 | SHELL_VAR *var; | |
2775 | ||
2776 | var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL; | |
2777 | ||
2778 | if (var) | |
2779 | { | |
2780 | FREE (value_cell (var)); | |
2781 | var_setvalue (var, savestring (value)); | |
2782 | INVALIDATE_EXPORTSTR (var); | |
2783 | } | |
2784 | ||
2785 | return (var); | |
2786 | } | |
2787 | ||
2788 | /* Find a variable in the temporary environment that is named NAME. | |
2789 | Return the SHELL_VAR *, or NULL if not found. */ | |
2790 | SHELL_VAR * | |
2791 | find_tempenv_variable (name) | |
2792 | const char *name; | |
2793 | { | |
2794 | return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL); | |
2795 | } | |
2796 | ||
2797 | /* Push the variable described by (SHELL_VAR *)DATA down to the next | |
2798 | variable context from the temporary environment. */ | |
2799 | static void | |
2800 | push_temp_var (data) | |
2801 | PTR_T data; | |
2802 | { | |
2803 | SHELL_VAR *var, *v; | |
2804 | HASH_TABLE *binding_table; | |
2805 | ||
2806 | var = (SHELL_VAR *)data; | |
2807 | ||
2808 | binding_table = shell_variables->table; | |
2809 | if (binding_table == 0) | |
2810 | { | |
2811 | if (shell_variables == global_variables) | |
2812 | /* shouldn't happen */ | |
2813 | binding_table = shell_variables->table = global_variables->table = hash_create (0); | |
2814 | else | |
2815 | binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS); | |
2816 | } | |
2817 | ||
2818 | v = bind_variable_internal (var->name, value_cell (var), binding_table, 0); | |
2819 | ||
2820 | /* XXX - should we set the context here? It shouldn't matter because of how | |
2821 | assign_in_env works, but might want to check. */ | |
2822 | if (binding_table == global_variables->table) /* XXX */ | |
2823 | var->attributes &= ~(att_tempvar|att_propagate); | |
2824 | else | |
2825 | { | |
2826 | var->attributes |= att_propagate; | |
2827 | if (binding_table == shell_variables->table) | |
2828 | shell_variables->flags |= VC_HASTMPVAR; | |
2829 | } | |
2830 | v->attributes |= var->attributes; | |
2831 | ||
2832 | dispose_variable (var); | |
2833 | } | |
2834 | ||
2835 | static void | |
2836 | propagate_temp_var (data) | |
2837 | PTR_T data; | |
2838 | { | |
2839 | SHELL_VAR *var; | |
2840 | ||
2841 | var = (SHELL_VAR *)data; | |
2842 | if (tempvar_p (var) && (var->attributes & att_propagate)) | |
2843 | push_temp_var (data); | |
2844 | else | |
2845 | dispose_variable (var); | |
2846 | } | |
2847 | ||
2848 | /* Free the storage used in the hash table for temporary | |
2849 | environment variables. PUSHF is a function to be called | |
2850 | to free each hash table entry. It takes care of pushing variables | |
2851 | to previous scopes if appropriate. */ | |
2852 | static void | |
2853 | dispose_temporary_env (pushf) | |
2854 | sh_free_func_t *pushf; | |
2855 | { | |
2856 | hash_flush (temporary_env, pushf); | |
2857 | hash_dispose (temporary_env); | |
2858 | temporary_env = (HASH_TABLE *)NULL; | |
2859 | ||
2860 | array_needs_making = 1; | |
2861 | ||
2862 | sv_ifs ("IFS"); /* XXX here for now */ | |
2863 | } | |
2864 | ||
2865 | void | |
2866 | dispose_used_env_vars () | |
2867 | { | |
2868 | if (temporary_env) | |
2869 | dispose_temporary_env (propagate_temp_var); | |
2870 | } | |
2871 | ||
2872 | /* Take all of the shell variables in the temporary environment HASH_TABLE | |
2873 | and make shell variables from them at the current variable context. */ | |
2874 | void | |
2875 | merge_temporary_env () | |
2876 | { | |
2877 | if (temporary_env) | |
2878 | dispose_temporary_env (push_temp_var); | |
2879 | } | |
2880 | ||
2881 | /* **************************************************************** */ | |
2882 | /* */ | |
2883 | /* Creating and manipulating the environment */ | |
2884 | /* */ | |
2885 | /* **************************************************************** */ | |
2886 | ||
bb70624e JA |
2887 | static inline char * |
2888 | mk_env_string (name, value) | |
f73dda09 | 2889 | const char *name, *value; |
bb70624e JA |
2890 | { |
2891 | int name_len, value_len; | |
2892 | char *p; | |
2893 | ||
2894 | name_len = strlen (name); | |
2895 | value_len = STRLEN (value); | |
f73dda09 | 2896 | p = (char *)xmalloc (2 + name_len + value_len); |
bb70624e JA |
2897 | strcpy (p, name); |
2898 | p[name_len] = '='; | |
2899 | if (value && *value) | |
2900 | strcpy (p + name_len + 1, value); | |
2901 | else | |
2902 | p[name_len + 1] = '\0'; | |
2903 | return (p); | |
2904 | } | |
2905 | ||
f73dda09 | 2906 | #ifdef DEBUG |
bb70624e JA |
2907 | /* Debugging */ |
2908 | static int | |
2909 | valid_exportstr (v) | |
2910 | SHELL_VAR *v; | |
2911 | { | |
2912 | char *s; | |
2913 | ||
2914 | s = v->exportstr; | |
f73dda09 | 2915 | if (legal_variable_starter ((unsigned char)*s) == 0) |
bb70624e JA |
2916 | { |
2917 | internal_error ("invalid character %d in exportstr for %s", *s, v->name); | |
2918 | return (0); | |
2919 | } | |
2920 | for (s = v->exportstr + 1; s && *s; s++) | |
2921 | { | |
2922 | if (*s == '=') | |
28ef6c31 | 2923 | break; |
f73dda09 | 2924 | if (legal_variable_char ((unsigned char)*s) == 0) |
bb70624e JA |
2925 | { |
2926 | internal_error ("invalid character %d in exportstr for %s", *s, v->name); | |
2927 | return (0); | |
2928 | } | |
2929 | } | |
2930 | if (*s != '=') | |
2931 | { | |
2932 | internal_error ("no `=' in exportstr for %s", v->name); | |
2933 | return (0); | |
2934 | } | |
2935 | return (1); | |
2936 | } | |
f73dda09 | 2937 | #endif |
bb70624e | 2938 | |
7117c2d2 JA |
2939 | static char ** |
2940 | make_env_array_from_var_list (vars) | |
2941 | SHELL_VAR **vars; | |
726f6388 JA |
2942 | { |
2943 | register int i, list_index; | |
2944 | register SHELL_VAR *var; | |
ccc6cda3 | 2945 | char **list, *value; |
726f6388 | 2946 | |
7117c2d2 | 2947 | list = strvec_create ((1 + strvec_len ((char **)vars))); |
bb70624e JA |
2948 | |
2949 | #define USE_EXPORTSTR (value == var->exportstr) | |
726f6388 JA |
2950 | |
2951 | for (i = 0, list_index = 0; var = vars[i]; i++) | |
2952 | { | |
28ef6c31 JA |
2953 | #if defined (__CYGWIN__) |
2954 | /* We don't use the exportstr stuff on Cygwin at all. */ | |
2955 | INVALIDATE_EXPORTSTR (var); | |
bb70624e | 2956 | #endif |
28ef6c31 JA |
2957 | if (var->exportstr) |
2958 | value = var->exportstr; | |
bb70624e | 2959 | else if (function_p (var)) |
ccc6cda3 JA |
2960 | value = named_function_string ((char *)NULL, function_cell (var), 0); |
2961 | #if defined (ARRAY_VARS) | |
2962 | else if (array_p (var)) | |
2963 | # if 0 | |
2964 | value = array_to_assignment_string (array_cell (var)); | |
2965 | # else | |
2966 | continue; /* XXX array vars cannot yet be exported */ | |
2967 | # endif | |
2968 | #endif | |
726f6388 JA |
2969 | else |
2970 | value = value_cell (var); | |
2971 | ||
2972 | if (value) | |
2973 | { | |
bb70624e JA |
2974 | /* Gee, I'd like to get away with not using savestring() if we're |
2975 | using the cached exportstr... */ | |
2976 | list[list_index] = USE_EXPORTSTR ? savestring (value) | |
2977 | : mk_env_string (var->name, value); | |
2978 | ||
7117c2d2 JA |
2979 | if (USE_EXPORTSTR == 0) |
2980 | SAVE_EXPORTSTR (var, list[list_index]); | |
2981 | ||
726f6388 | 2982 | list_index++; |
bb70624e JA |
2983 | #undef USE_EXPORTSTR |
2984 | ||
2985 | #if 0 /* not yet */ | |
ccc6cda3 JA |
2986 | #if defined (ARRAY_VARS) |
2987 | if (array_p (var)) | |
2988 | free (value); | |
bb70624e | 2989 | #endif |
ccc6cda3 | 2990 | #endif |
726f6388 JA |
2991 | } |
2992 | } | |
2993 | ||
726f6388 JA |
2994 | list[list_index] = (char *)NULL; |
2995 | return (list); | |
2996 | } | |
2997 | ||
7117c2d2 JA |
2998 | /* Make an array of assignment statements from the hash table |
2999 | HASHED_VARS which contains SHELL_VARs. Only visible, exported | |
3000 | variables are eligible. */ | |
3001 | static char ** | |
3002 | make_var_export_array (vcxt) | |
3003 | VAR_CONTEXT *vcxt; | |
726f6388 | 3004 | { |
7117c2d2 JA |
3005 | char **list; |
3006 | SHELL_VAR **vars; | |
726f6388 | 3007 | |
7117c2d2 | 3008 | vars = map_over (visible_and_exported, vcxt); |
726f6388 | 3009 | |
7117c2d2 JA |
3010 | if (vars == 0) |
3011 | return (char **)NULL; | |
ccc6cda3 | 3012 | |
7117c2d2 | 3013 | list = make_env_array_from_var_list (vars); |
ccc6cda3 | 3014 | |
7117c2d2 JA |
3015 | free (vars); |
3016 | return (list); | |
ccc6cda3 JA |
3017 | } |
3018 | ||
7117c2d2 JA |
3019 | static char ** |
3020 | make_func_export_array () | |
726f6388 | 3021 | { |
7117c2d2 JA |
3022 | char **list; |
3023 | SHELL_VAR **vars; | |
ccc6cda3 | 3024 | |
7117c2d2 JA |
3025 | vars = map_over_funcs (visible_and_exported); |
3026 | if (vars == 0) | |
3027 | return (char **)NULL; | |
726f6388 | 3028 | |
7117c2d2 | 3029 | list = make_env_array_from_var_list (vars); |
28ef6c31 | 3030 | |
7117c2d2 JA |
3031 | free (vars); |
3032 | return (list); | |
bb70624e JA |
3033 | } |
3034 | ||
d166f048 JA |
3035 | /* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */ |
3036 | #define add_to_export_env(envstr,do_alloc) \ | |
3037 | do \ | |
3038 | { \ | |
3039 | if (export_env_index >= (export_env_size - 1)) \ | |
3040 | { \ | |
3041 | export_env_size += 16; \ | |
7117c2d2 | 3042 | export_env = strvec_resize (export_env, export_env_size); \ |
d166f048 JA |
3043 | } \ |
3044 | export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \ | |
3045 | export_env[export_env_index] = (char *)NULL; \ | |
3046 | } while (0) | |
3047 | ||
d166f048 JA |
3048 | /* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the |
3049 | array with the same left-hand side. Return the new EXPORT_ENV. */ | |
726f6388 | 3050 | char ** |
d166f048 | 3051 | add_or_supercede_exported_var (assign, do_alloc) |
726f6388 | 3052 | char *assign; |
d166f048 | 3053 | int do_alloc; |
726f6388 JA |
3054 | { |
3055 | register int i; | |
d166f048 | 3056 | int equal_offset; |
726f6388 | 3057 | |
d166f048 JA |
3058 | equal_offset = assignment (assign); |
3059 | if (equal_offset == 0) | |
3060 | return (export_env); | |
726f6388 | 3061 | |
7117c2d2 JA |
3062 | /* If this is a function, then only supersede the function definition. |
3063 | We do this by including the `=() {' in the comparison, like | |
3064 | initialize_shell_variables does. */ | |
3065 | if (assign[equal_offset + 1] == '(' && | |
3066 | strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */ | |
3067 | equal_offset += 4; | |
726f6388 | 3068 | |
d166f048 | 3069 | for (i = 0; i < export_env_index; i++) |
726f6388 | 3070 | { |
d166f048 | 3071 | if (STREQN (assign, export_env[i], equal_offset + 1)) |
726f6388 | 3072 | { |
d166f048 JA |
3073 | free (export_env[i]); |
3074 | export_env[i] = do_alloc ? savestring (assign) : assign; | |
3075 | return (export_env); | |
726f6388 JA |
3076 | } |
3077 | } | |
d166f048 JA |
3078 | add_to_export_env (assign, do_alloc); |
3079 | return (export_env); | |
726f6388 JA |
3080 | } |
3081 | ||
7117c2d2 JA |
3082 | static void |
3083 | add_temp_array_to_env (temp_array, do_alloc, do_supercede) | |
3084 | char **temp_array; | |
3085 | int do_alloc, do_supercede; | |
3086 | { | |
3087 | register int i; | |
3088 | ||
3089 | if (temp_array == 0) | |
3090 | return; | |
3091 | ||
3092 | for (i = 0; temp_array[i]; i++) | |
3093 | { | |
3094 | if (do_supercede) | |
3095 | export_env = add_or_supercede_exported_var (temp_array[i], do_alloc); | |
3096 | else | |
3097 | add_to_export_env (temp_array[i], do_alloc); | |
3098 | } | |
3099 | ||
3100 | free (temp_array); | |
3101 | } | |
3102 | ||
d166f048 | 3103 | /* Make the environment array for the command about to be executed, if the |
726f6388 JA |
3104 | array needs making. Otherwise, do nothing. If a shell action could |
3105 | change the array that commands receive for their environment, then the | |
7117c2d2 JA |
3106 | code should `array_needs_making++'. |
3107 | ||
3108 | The order to add to the array is: | |
3109 | temporary_env | |
3110 | list of var contexts whose head is shell_variables | |
3111 | shell_functions | |
3112 | ||
3113 | This is the shell variable lookup order. We add only new variable | |
3114 | names at each step, which allows local variables and variables in | |
3115 | the temporary environments to shadow variables in the global (or | |
3116 | any previous) scope. | |
3117 | */ | |
3118 | ||
3119 | static int | |
3120 | n_shell_variables () | |
3121 | { | |
3122 | VAR_CONTEXT *vc; | |
3123 | int n; | |
3124 | ||
3125 | for (n = 0, vc = shell_variables; vc; vc = vc->down) | |
3126 | n += HASH_ENTRIES (vc->table); | |
3127 | return n; | |
3128 | } | |
3129 | ||
726f6388 JA |
3130 | void |
3131 | maybe_make_export_env () | |
3132 | { | |
726f6388 | 3133 | register char **temp_array; |
d166f048 | 3134 | int new_size; |
7117c2d2 | 3135 | VAR_CONTEXT *tcxt; |
726f6388 JA |
3136 | |
3137 | if (array_needs_making) | |
3138 | { | |
3139 | if (export_env) | |
7117c2d2 | 3140 | strvec_flush (export_env); |
d166f048 JA |
3141 | |
3142 | /* Make a guess based on how many shell variables and functions we | |
3143 | have. Since there will always be array variables, and array | |
3144 | variables are not (yet) exported, this will always be big enough | |
7117c2d2 JA |
3145 | for the exported variables and functions. */ |
3146 | new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 + | |
3147 | HASH_ENTRIES (temporary_env); | |
d166f048 JA |
3148 | if (new_size > export_env_size) |
3149 | { | |
3150 | export_env_size = new_size; | |
7117c2d2 | 3151 | export_env = strvec_resize (export_env, export_env_size); |
d166f048 JA |
3152 | } |
3153 | export_env[export_env_index = 0] = (char *)NULL; | |
726f6388 | 3154 | |
7117c2d2 JA |
3155 | /* Make a dummy variable context from the temporary_env, stick it on |
3156 | the front of shell_variables, call make_var_export_array on the | |
3157 | whole thing to flatten it, and convert the list of SHELL_VAR *s | |
3158 | to the form needed by the environment. */ | |
3159 | if (temporary_env) | |
3160 | { | |
3161 | tcxt = new_var_context ((char *)NULL, 0); | |
3162 | tcxt->table = temporary_env; | |
3163 | tcxt->down = shell_variables; | |
3164 | } | |
3165 | else | |
3166 | tcxt = shell_variables; | |
3167 | ||
3168 | temp_array = make_var_export_array (tcxt); | |
d166f048 | 3169 | if (temp_array) |
7117c2d2 JA |
3170 | add_temp_array_to_env (temp_array, 0, 0); |
3171 | ||
3172 | if (tcxt != shell_variables) | |
3173 | free (tcxt); | |
726f6388 | 3174 | |
f73dda09 JA |
3175 | #if defined (RESTRICTED_SHELL) |
3176 | /* Restricted shells may not export shell functions. */ | |
7117c2d2 | 3177 | temp_array = restricted ? (char **)0 : make_func_export_array (); |
f73dda09 | 3178 | #else |
7117c2d2 | 3179 | temp_array = make_func_export_array (); |
f73dda09 | 3180 | #endif |
d166f048 | 3181 | if (temp_array) |
7117c2d2 | 3182 | add_temp_array_to_env (temp_array, 0, 0); |
726f6388 JA |
3183 | |
3184 | array_needs_making = 0; | |
3185 | } | |
3186 | } | |
3187 | ||
b72432fd JA |
3188 | /* This is an efficiency hack. PWD and OLDPWD are auto-exported, so |
3189 | we will need to remake the exported environment every time we | |
3190 | change directories. `_' is always put into the environment for | |
3191 | every external command, so without special treatment it will always | |
3192 | cause the environment to be remade. | |
3193 | ||
3194 | If there is no other reason to make the exported environment, we can | |
3195 | just update the variables in place and mark the exported environment | |
3196 | as no longer needing a remake. */ | |
3197 | void | |
3198 | update_export_env_inplace (env_prefix, preflen, value) | |
3199 | char *env_prefix; | |
3200 | int preflen; | |
3201 | char *value; | |
3202 | { | |
3203 | char *evar; | |
3204 | ||
f73dda09 | 3205 | evar = (char *)xmalloc (STRLEN (value) + preflen + 1); |
b72432fd JA |
3206 | strcpy (evar, env_prefix); |
3207 | if (value) | |
3208 | strcpy (evar + preflen, value); | |
3209 | export_env = add_or_supercede_exported_var (evar, 0); | |
3210 | } | |
3211 | ||
726f6388 JA |
3212 | /* We always put _ in the environment as the name of this command. */ |
3213 | void | |
3214 | put_command_name_into_env (command_name) | |
3215 | char *command_name; | |
3216 | { | |
b72432fd | 3217 | update_export_env_inplace ("_=", 2, command_name); |
726f6388 JA |
3218 | } |
3219 | ||
cce855bc | 3220 | #if 0 /* UNUSED -- it caused too many problems */ |
ccc6cda3 JA |
3221 | void |
3222 | put_gnu_argv_flags_into_env (pid, flags_string) | |
7117c2d2 | 3223 | intmax_t pid; |
ccc6cda3 JA |
3224 | char *flags_string; |
3225 | { | |
3226 | char *dummy, *pbuf; | |
3227 | int l, fl; | |
3228 | ||
3229 | pbuf = itos (pid); | |
3230 | l = strlen (pbuf); | |
3231 | ||
3232 | fl = strlen (flags_string); | |
3233 | ||
f73dda09 | 3234 | dummy = (char *)xmalloc (l + fl + 30); |
ccc6cda3 JA |
3235 | dummy[0] = '_'; |
3236 | strcpy (dummy + 1, pbuf); | |
3237 | strcpy (dummy + 1 + l, "_GNU_nonoption_argv_flags_"); | |
3238 | dummy[l + 27] = '='; | |
3239 | strcpy (dummy + l + 28, flags_string); | |
3240 | ||
3241 | free (pbuf); | |
3242 | ||
d166f048 | 3243 | export_env = add_or_supercede_exported_var (dummy, 0); |
ccc6cda3 | 3244 | } |
cce855bc | 3245 | #endif |
726f6388 | 3246 | |
7117c2d2 JA |
3247 | /* **************************************************************** */ |
3248 | /* */ | |
3249 | /* Managing variable contexts */ | |
3250 | /* */ | |
3251 | /* **************************************************************** */ | |
3252 | ||
3253 | /* Allocate and return a new variable context with NAME and FLAGS. | |
3254 | NAME can be NULL. */ | |
726f6388 | 3255 | |
7117c2d2 JA |
3256 | VAR_CONTEXT * |
3257 | new_var_context (name, flags) | |
3258 | char *name; | |
3259 | int flags; | |
3260 | { | |
3261 | VAR_CONTEXT *vc; | |
3262 | ||
3263 | vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT)); | |
3264 | vc->name = name ? savestring (name) : (char *)NULL; | |
3265 | vc->scope = variable_context; | |
3266 | vc->flags = flags; | |
3267 | ||
3268 | vc->up = vc->down = (VAR_CONTEXT *)NULL; | |
3269 | vc->table = (HASH_TABLE *)NULL; | |
3270 | ||
3271 | return vc; | |
3272 | } | |
3273 | ||
3274 | /* Free a variable context and its data, including the hash table. Dispose | |
3275 | all of the variables. */ | |
3276 | void | |
3277 | dispose_var_context (vc) | |
3278 | VAR_CONTEXT *vc; | |
3279 | { | |
3280 | FREE (vc->name); | |
3281 | ||
3282 | if (vc->table) | |
3283 | { | |
3284 | delete_all_variables (vc->table); | |
3285 | hash_dispose (vc->table); | |
3286 | } | |
3287 | ||
3288 | free (vc); | |
3289 | } | |
3290 | ||
3291 | /* Set VAR's scope level to the current variable context. */ | |
3292 | static int | |
3293 | set_context (var) | |
3294 | SHELL_VAR *var; | |
3295 | { | |
3296 | return (var->context = variable_context); | |
3297 | } | |
3298 | ||
3299 | /* Make a new variable context with NAME and FLAGS and a HASH_TABLE of | |
3300 | temporary variables, and push it onto shell_variables. This is | |
3301 | for shell functions. */ | |
3302 | VAR_CONTEXT * | |
3303 | push_var_context (name, flags, tempvars) | |
3304 | char *name; | |
3305 | int flags; | |
3306 | HASH_TABLE *tempvars; | |
3307 | { | |
3308 | VAR_CONTEXT *vc; | |
3309 | ||
3310 | vc = new_var_context (name, flags); | |
3311 | vc->table = tempvars; | |
3312 | if (tempvars) | |
3313 | { | |
3314 | /* Have to do this because the temp environment was created before | |
3315 | variable_context was incremented. */ | |
3316 | flatten (tempvars, set_context, (VARLIST *)NULL, 0); | |
3317 | vc->flags |= VC_HASTMPVAR; | |
3318 | } | |
3319 | vc->down = shell_variables; | |
3320 | shell_variables->up = vc; | |
3321 | ||
3322 | return (shell_variables = vc); | |
3323 | } | |
3324 | ||
3325 | static void | |
3326 | push_func_var (data) | |
3327 | PTR_T data; | |
3328 | { | |
3329 | SHELL_VAR *var, *v; | |
3330 | ||
3331 | var = (SHELL_VAR *)data; | |
3332 | ||
3333 | if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate))) | |
3334 | { | |
3335 | /* XXX - should we set v->context here? */ | |
3336 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0); | |
3337 | if (shell_variables == global_variables) | |
3338 | var->attributes &= ~(att_tempvar|att_propagate); | |
3339 | else | |
3340 | shell_variables->flags |= VC_HASTMPVAR; | |
3341 | v->attributes |= var->attributes; | |
3342 | } | |
3343 | ||
3344 | dispose_variable (var); | |
3345 | } | |
3346 | ||
3347 | /* Pop the top context off of VCXT and dispose of it, returning the rest of | |
3348 | the stack. */ | |
3349 | void | |
3350 | pop_var_context () | |
3351 | { | |
3352 | VAR_CONTEXT *ret, *vcxt; | |
3353 | ||
3354 | vcxt = shell_variables; | |
3355 | if (vc_isfuncenv (vcxt) == 0) | |
3356 | { | |
3357 | internal_error ("pop_var_context: head of shell_variables not a function context"); | |
3358 | return; | |
3359 | } | |
3360 | ||
3361 | if (ret = vcxt->down) | |
3362 | { | |
3363 | ret->up = (VAR_CONTEXT *)NULL; | |
3364 | shell_variables = ret; | |
3365 | if (vcxt->table) | |
3366 | hash_flush (vcxt->table, push_func_var); | |
3367 | dispose_var_context (vcxt); | |
3368 | } | |
3369 | else | |
3370 | internal_error ("pop_var_context: no global_variables context"); | |
3371 | } | |
3372 | ||
3373 | /* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and | |
3374 | all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */ | |
3375 | void | |
3376 | delete_all_contexts (vcxt) | |
3377 | VAR_CONTEXT *vcxt; | |
3378 | { | |
3379 | VAR_CONTEXT *v, *t; | |
3380 | ||
3381 | for (v = vcxt; v != global_variables; v = t) | |
3382 | { | |
3383 | t = v->down; | |
3384 | dispose_var_context (v); | |
3385 | } | |
3386 | ||
3387 | delete_all_variables (global_variables->table); | |
3388 | shell_variables = global_variables; | |
3389 | } | |
3390 | ||
3391 | /* **************************************************************** */ | |
3392 | /* */ | |
3393 | /* Pushing and Popping temporary variable scopes */ | |
3394 | /* */ | |
3395 | /* **************************************************************** */ | |
3396 | ||
3397 | VAR_CONTEXT * | |
3398 | push_scope (flags, tmpvars) | |
3399 | int flags; | |
3400 | HASH_TABLE *tmpvars; | |
3401 | { | |
3402 | return (push_var_context ((char *)NULL, flags, tmpvars)); | |
3403 | } | |
3404 | ||
3405 | static void | |
3406 | push_exported_var (data) | |
3407 | PTR_T data; | |
3408 | { | |
3409 | SHELL_VAR *var, *v; | |
3410 | ||
3411 | var = (SHELL_VAR *)data; | |
3412 | ||
3413 | /* If a temp var had its export attribute set, or it's marked to be | |
3414 | propagated, bind it in the previous scope before disposing it. */ | |
3415 | if (exported_p (var) || (var->attributes & att_propagate)) | |
3416 | { | |
3417 | var->attributes &= ~att_tempvar; /* XXX */ | |
3418 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0); | |
3419 | if (shell_variables == global_variables) | |
3420 | var->attributes &= ~att_propagate; | |
3421 | v->attributes |= var->attributes; | |
3422 | } | |
3423 | ||
3424 | dispose_variable (var); | |
3425 | } | |
3426 | ||
3427 | void | |
3428 | pop_scope (is_special) | |
3429 | int is_special; | |
3430 | { | |
3431 | VAR_CONTEXT *vcxt, *ret; | |
3432 | ||
3433 | vcxt = shell_variables; | |
3434 | if (vc_istempscope (vcxt) == 0) | |
3435 | { | |
3436 | internal_error ("pop_scope: head of shell_variables not a temporary environment scope"); | |
3437 | return; | |
3438 | } | |
3439 | ||
3440 | ret = vcxt->down; | |
3441 | if (ret) | |
3442 | ret->up = (VAR_CONTEXT *)NULL; | |
3443 | ||
3444 | shell_variables = ret; | |
3445 | ||
3446 | /* Now we can take care of merging variables in VCXT into set of scopes | |
3447 | whose head is RET (shell_variables). */ | |
3448 | FREE (vcxt->name); | |
3449 | if (vcxt->table) | |
3450 | { | |
3451 | if (is_special) | |
3452 | hash_flush (vcxt->table, push_func_var); | |
3453 | else | |
3454 | hash_flush (vcxt->table, push_exported_var); | |
3455 | hash_dispose (vcxt->table); | |
3456 | } | |
3457 | free (vcxt); | |
3458 | ||
3459 | sv_ifs ("IFS"); /* XXX here for now */ | |
3460 | } | |
3461 | ||
3462 | /* **************************************************************** */ | |
3463 | /* */ | |
3464 | /* Pushing and Popping function contexts */ | |
3465 | /* */ | |
3466 | /* **************************************************************** */ | |
3467 | ||
3468 | static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL; | |
3469 | static int dollar_arg_stack_slots; | |
3470 | static int dollar_arg_stack_index; | |
3471 | ||
3472 | /* XXX - we might want to consider pushing and popping the `getopts' state | |
3473 | when we modify the positional parameters. */ | |
3474 | void | |
3475 | push_context (name, is_subshell, tempvars) | |
3476 | char *name; /* function name */ | |
3477 | int is_subshell; | |
3478 | HASH_TABLE *tempvars; | |
3479 | { | |
3480 | if (is_subshell == 0) | |
3481 | push_dollar_vars (); | |
3482 | variable_context++; | |
3483 | push_var_context (name, VC_FUNCENV, tempvars); | |
3484 | } | |
3485 | ||
3486 | /* Only called when subshell == 0, so we don't need to check, and can | |
3487 | unconditionally pop the dollar vars off the stack. */ | |
3488 | void | |
3489 | pop_context () | |
726f6388 | 3490 | { |
7117c2d2 JA |
3491 | pop_dollar_vars (); |
3492 | variable_context--; | |
3493 | pop_var_context (); | |
726f6388 | 3494 | |
7117c2d2 JA |
3495 | sv_ifs ("IFS"); /* XXX here for now */ |
3496 | } | |
726f6388 | 3497 | |
7117c2d2 JA |
3498 | /* Save the existing positional parameters on a stack. */ |
3499 | void | |
3500 | push_dollar_vars () | |
3501 | { | |
3502 | if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots) | |
3503 | { | |
3504 | dollar_arg_stack = (WORD_LIST **) | |
3505 | xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10) | |
3506 | * sizeof (WORD_LIST **)); | |
3507 | } | |
3508 | dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args (); | |
3509 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
3510 | } | |
726f6388 | 3511 | |
7117c2d2 JA |
3512 | /* Restore the positional parameters from our stack. */ |
3513 | void | |
3514 | pop_dollar_vars () | |
3515 | { | |
3516 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
3517 | return; | |
726f6388 | 3518 | |
7117c2d2 JA |
3519 | remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1); |
3520 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); | |
3521 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
3522 | set_dollar_vars_unchanged (); | |
3523 | } | |
ccc6cda3 | 3524 | |
7117c2d2 JA |
3525 | void |
3526 | dispose_saved_dollar_vars () | |
3527 | { | |
3528 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
3529 | return; | |
726f6388 | 3530 | |
7117c2d2 JA |
3531 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); |
3532 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
726f6388 | 3533 | } |
cce855bc | 3534 | |
d3a24ed2 CR |
3535 | /* Manipulate the special BASH_ARGV and BASH_ARGC variables. */ |
3536 | ||
3537 | void | |
3538 | push_args (list) | |
3539 | WORD_LIST *list; | |
3540 | { | |
3541 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
3542 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
3543 | ARRAY *bash_argv_a, *bash_argc_a; | |
3544 | WORD_LIST *l; | |
3545 | arrayind_t i; | |
3546 | char *t; | |
3547 | ||
3548 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
3549 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
3550 | ||
3551 | for (l = list, i = 0; l; l = l->next, i++) | |
3552 | array_push (bash_argv_a, l->word->word); | |
3553 | ||
3554 | t = itos (i); | |
3555 | array_push (bash_argc_a, t); | |
3556 | free (t); | |
3557 | #endif /* ARRAY_VARS && DEBUGGER */ | |
3558 | } | |
3559 | ||
3560 | /* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC | |
3561 | array and use that value as the count of elements to remove from | |
3562 | BASH_ARGV. */ | |
3563 | void | |
3564 | pop_args () | |
3565 | { | |
3566 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
3567 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
3568 | ARRAY *bash_argv_a, *bash_argc_a; | |
3569 | ARRAY_ELEMENT *ce; | |
3570 | intmax_t i; | |
3571 | ||
3572 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
3573 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
3574 | ||
3575 | ce = array_shift (bash_argc_a, 1, 0); | |
3576 | if (ce == 0 || legal_number (element_value (ce), &i) == 0) | |
3577 | i = 0; | |
3578 | ||
3579 | for ( ; i > 0; i--) | |
3580 | array_pop (bash_argv_a); | |
3581 | array_dispose_element (ce); | |
3582 | #endif /* ARRAY_VARS && DEBUGGER */ | |
3583 | } | |
3584 | ||
cce855bc JA |
3585 | /************************************************* |
3586 | * * | |
3587 | * Functions to manage special variables * | |
3588 | * * | |
3589 | *************************************************/ | |
3590 | ||
3591 | /* Extern declarations for variables this code has to manage. */ | |
3592 | extern int eof_encountered, eof_encountered_limit, ignoreeof; | |
3593 | ||
3594 | #if defined (READLINE) | |
3595 | extern int no_line_editing; | |
3596 | extern int hostname_list_initialized; | |
3597 | #endif | |
3598 | ||
3599 | /* An alist of name.function for each special variable. Most of the | |
3600 | functions don't do much, and in fact, this would be faster with a | |
3601 | switch statement, but by the end of this file, I am sick of switch | |
3602 | statements. */ | |
3603 | ||
3604 | #define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0 | |
3605 | ||
7117c2d2 | 3606 | /* This table will be sorted with qsort() the first time it's accessed. */ |
cce855bc JA |
3607 | struct name_and_function { |
3608 | char *name; | |
f73dda09 | 3609 | sh_sv_func_t *function; |
7117c2d2 | 3610 | }; |
cce855bc | 3611 | |
7117c2d2 | 3612 | static struct name_and_function special_vars[] = { |
cce855bc JA |
3613 | { "GLOBIGNORE", sv_globignore }, |
3614 | ||
cce855bc | 3615 | #if defined (HISTORY) |
7117c2d2 JA |
3616 | { "HISTCONTROL", sv_history_control }, |
3617 | { "HISTFILESIZE", sv_histsize }, | |
cce855bc JA |
3618 | { "HISTIGNORE", sv_histignore }, |
3619 | { "HISTSIZE", sv_histsize }, | |
d3a24ed2 | 3620 | { "HISTTIMEFORMAT", sv_histtimefmt }, |
7117c2d2 | 3621 | #endif |
cce855bc | 3622 | |
7117c2d2 JA |
3623 | #if defined (READLINE) |
3624 | { "HOSTFILE", sv_hostfile }, | |
3625 | #endif | |
cce855bc | 3626 | |
7117c2d2 JA |
3627 | { "IFS", sv_ifs }, |
3628 | { "IGNOREEOF", sv_ignoreeof }, | |
cce855bc | 3629 | |
7117c2d2 | 3630 | { "LANG", sv_locale }, |
cce855bc JA |
3631 | { "LC_ALL", sv_locale }, |
3632 | { "LC_COLLATE", sv_locale }, | |
3633 | { "LC_CTYPE", sv_locale }, | |
3634 | { "LC_MESSAGES", sv_locale }, | |
bb70624e | 3635 | { "LC_NUMERIC", sv_locale }, |
7117c2d2 JA |
3636 | |
3637 | { "MAIL", sv_mail }, | |
3638 | { "MAILCHECK", sv_mail }, | |
3639 | { "MAILPATH", sv_mail }, | |
3640 | ||
3641 | { "OPTERR", sv_opterr }, | |
3642 | { "OPTIND", sv_optind }, | |
3643 | ||
3644 | { "PATH", sv_path }, | |
3645 | { "POSIXLY_CORRECT", sv_strict_posix }, | |
3646 | ||
3647 | #if defined (READLINE) | |
3648 | { "TERM", sv_terminal }, | |
3649 | { "TERMCAP", sv_terminal }, | |
3650 | { "TERMINFO", sv_terminal }, | |
3651 | #endif /* READLINE */ | |
3652 | ||
3653 | { "TEXTDOMAIN", sv_locale }, | |
3654 | { "TEXTDOMAINDIR", sv_locale }, | |
cce855bc JA |
3655 | |
3656 | #if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE) | |
3657 | { "TZ", sv_tz }, | |
3658 | #endif | |
3659 | ||
7117c2d2 JA |
3660 | #if defined (HISTORY) && defined (BANG_HISTORY) |
3661 | { "histchars", sv_histchars }, | |
3662 | #endif /* HISTORY && BANG_HISTORY */ | |
3663 | ||
3664 | { "ignoreeof", sv_ignoreeof }, | |
3665 | ||
f73dda09 | 3666 | { (char *)0, (sh_sv_func_t *)0 } |
cce855bc JA |
3667 | }; |
3668 | ||
7117c2d2 JA |
3669 | #define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1) |
3670 | ||
3671 | static int | |
3672 | sv_compare (sv1, sv2) | |
3673 | struct name_and_function *sv1, *sv2; | |
3674 | { | |
3675 | int r; | |
3676 | ||
3677 | if ((r = sv1->name[0] - sv2->name[0]) == 0) | |
3678 | r = strcmp (sv1->name, sv2->name); | |
3679 | return r; | |
3680 | } | |
3681 | ||
3682 | static inline int | |
3683 | find_special_var (name) | |
3684 | const char *name; | |
3685 | { | |
3686 | register int i, r; | |
3687 | ||
3688 | for (i = 0; special_vars[i].name; i++) | |
3689 | { | |
3690 | r = special_vars[i].name[0] - name[0]; | |
3691 | if (r == 0) | |
3692 | r = strcmp (special_vars[i].name, name); | |
3693 | if (r == 0) | |
3694 | return i; | |
3695 | else if (r > 0) | |
3696 | /* Can't match any of rest of elements in sorted list. Take this out | |
3697 | if it causes problems in certain environments. */ | |
3698 | break; | |
3699 | } | |
3700 | return -1; | |
3701 | } | |
3702 | ||
cce855bc JA |
3703 | /* The variable in NAME has just had its state changed. Check to see if it |
3704 | is one of the special ones where something special happens. */ | |
3705 | void | |
3706 | stupidly_hack_special_variables (name) | |
3707 | char *name; | |
3708 | { | |
7117c2d2 | 3709 | static int sv_sorted = 0; |
cce855bc JA |
3710 | int i; |
3711 | ||
7117c2d2 | 3712 | if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */ |
cce855bc | 3713 | { |
7117c2d2 JA |
3714 | qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]), |
3715 | (QSFUNC *)sv_compare); | |
3716 | sv_sorted = 1; | |
cce855bc | 3717 | } |
7117c2d2 JA |
3718 | |
3719 | i = find_special_var (name); | |
3720 | if (i != -1) | |
3721 | (*(special_vars[i].function)) (name); | |
3722 | } | |
3723 | ||
3724 | void | |
3725 | sv_ifs (name) | |
3726 | char *name; | |
3727 | { | |
3728 | SHELL_VAR *v; | |
3729 | ||
3730 | v = find_variable ("IFS"); | |
3731 | setifs (v); | |
cce855bc JA |
3732 | } |
3733 | ||
3734 | /* What to do just after the PATH variable has changed. */ | |
3735 | void | |
3736 | sv_path (name) | |
3737 | char *name; | |
3738 | { | |
3739 | /* hash -r */ | |
7117c2d2 | 3740 | phash_flush (); |
cce855bc JA |
3741 | } |
3742 | ||
3743 | /* What to do just after one of the MAILxxxx variables has changed. NAME | |
3744 | is the name of the variable. This is called with NAME set to one of | |
3745 | MAIL, MAILCHECK, or MAILPATH. */ | |
3746 | void | |
3747 | sv_mail (name) | |
3748 | char *name; | |
3749 | { | |
3750 | /* If the time interval for checking the files has changed, then | |
3751 | reset the mail timer. Otherwise, one of the pathname vars | |
3752 | to the users mailbox has changed, so rebuild the array of | |
3753 | filenames. */ | |
3754 | if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */ | |
3755 | reset_mail_timer (); | |
3756 | else | |
3757 | { | |
3758 | free_mail_files (); | |
3759 | remember_mail_dates (); | |
3760 | } | |
3761 | } | |
3762 | ||
3763 | /* What to do when GLOBIGNORE changes. */ | |
3764 | void | |
3765 | sv_globignore (name) | |
3766 | char *name; | |
3767 | { | |
3768 | setup_glob_ignore (name); | |
3769 | } | |
3770 | ||
3771 | #if defined (READLINE) | |
3772 | /* What to do just after one of the TERMxxx variables has changed. | |
3773 | If we are an interactive shell, then try to reset the terminal | |
3774 | information in readline. */ | |
3775 | void | |
3776 | sv_terminal (name) | |
3777 | char *name; | |
3778 | { | |
3779 | if (interactive_shell && no_line_editing == 0) | |
3780 | rl_reset_terminal (get_string_value ("TERM")); | |
3781 | } | |
3782 | ||
3783 | void | |
3784 | sv_hostfile (name) | |
3785 | char *name; | |
3786 | { | |
bb70624e JA |
3787 | SHELL_VAR *v; |
3788 | ||
3789 | v = find_variable (name); | |
3790 | if (v == 0) | |
3791 | clear_hostname_list (); | |
3792 | else | |
3793 | hostname_list_initialized = 0; | |
cce855bc JA |
3794 | } |
3795 | #endif /* READLINE */ | |
3796 | ||
3797 | #if defined (HISTORY) | |
3798 | /* What to do after the HISTSIZE or HISTFILESIZE variables change. | |
3799 | If there is a value for this HISTSIZE (and it is numeric), then stifle | |
3800 | the history. Otherwise, if there is NO value for this variable, | |
3801 | unstifle the history. If name is HISTFILESIZE, and its value is | |
3802 | numeric, truncate the history file to hold no more than that many | |
3803 | lines. */ | |
3804 | void | |
3805 | sv_histsize (name) | |
3806 | char *name; | |
3807 | { | |
3808 | char *temp; | |
7117c2d2 | 3809 | intmax_t num; |
cce855bc JA |
3810 | |
3811 | temp = get_string_value (name); | |
3812 | ||
3813 | if (temp && *temp) | |
3814 | { | |
3815 | if (legal_number (temp, &num)) | |
28ef6c31 | 3816 | { |
cce855bc JA |
3817 | if (name[4] == 'S') |
3818 | { | |
3819 | stifle_history (num); | |
3820 | num = where_history (); | |
3821 | if (history_lines_this_session > num) | |
3822 | history_lines_this_session = num; | |
3823 | } | |
3824 | else | |
3825 | { | |
3826 | history_truncate_file (get_string_value ("HISTFILE"), (int)num); | |
3827 | if (num <= history_lines_in_file) | |
3828 | history_lines_in_file = num; | |
3829 | } | |
3830 | } | |
3831 | } | |
3832 | else if (name[4] == 'S') | |
3833 | unstifle_history (); | |
3834 | } | |
3835 | ||
3836 | /* What to do after the HISTIGNORE variable changes. */ | |
3837 | void | |
3838 | sv_histignore (name) | |
3839 | char *name; | |
3840 | { | |
3841 | setup_history_ignore (name); | |
3842 | } | |
3843 | ||
3844 | /* What to do after the HISTCONTROL variable changes. */ | |
3845 | void | |
3846 | sv_history_control (name) | |
3847 | char *name; | |
3848 | { | |
3849 | char *temp; | |
d3a24ed2 CR |
3850 | char *val; |
3851 | int tptr; | |
cce855bc JA |
3852 | |
3853 | history_control = 0; | |
3854 | temp = get_string_value (name); | |
3855 | ||
d3a24ed2 CR |
3856 | if (temp == 0 || *temp == 0) |
3857 | return; | |
3858 | ||
3859 | tptr = 0; | |
3860 | while (val = extract_colon_unit (temp, &tptr)) | |
cce855bc | 3861 | { |
d3a24ed2 CR |
3862 | if (STREQ (val, "ignorespace")) |
3863 | history_control |= HC_IGNSPACE; | |
3864 | else if (STREQ (val, "ignoredups")) | |
3865 | history_control |= HC_IGNDUPS; | |
3866 | else if (STREQ (val, "ignoreboth")) | |
3867 | history_control |= HC_IGNBOTH; | |
3868 | else if (STREQ (val, "erasedups")) | |
3869 | history_control |= HC_ERASEDUPS; | |
3870 | ||
3871 | free (val); | |
cce855bc JA |
3872 | } |
3873 | } | |
3874 | ||
3875 | #if defined (BANG_HISTORY) | |
3876 | /* Setting/unsetting of the history expansion character. */ | |
3877 | void | |
3878 | sv_histchars (name) | |
3879 | char *name; | |
3880 | { | |
3881 | char *temp; | |
3882 | ||
3883 | temp = get_string_value (name); | |
3884 | if (temp) | |
3885 | { | |
3886 | history_expansion_char = *temp; | |
3887 | if (temp[0] && temp[1]) | |
3888 | { | |
3889 | history_subst_char = temp[1]; | |
3890 | if (temp[2]) | |
3891 | history_comment_char = temp[2]; | |
3892 | } | |
3893 | } | |
3894 | else | |
3895 | { | |
3896 | history_expansion_char = '!'; | |
3897 | history_subst_char = '^'; | |
3898 | history_comment_char = '#'; | |
3899 | } | |
3900 | } | |
3901 | #endif /* BANG_HISTORY */ | |
d3a24ed2 CR |
3902 | |
3903 | void | |
3904 | sv_histtimefmt (name) | |
3905 | char *name; | |
3906 | { | |
3907 | SHELL_VAR *v; | |
3908 | ||
3909 | v = find_variable (name); | |
3910 | history_write_timestamps = (v != 0); | |
3911 | } | |
cce855bc JA |
3912 | #endif /* HISTORY */ |
3913 | ||
3914 | #if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE) | |
3915 | void | |
3916 | sv_tz (name) | |
3917 | char *name; | |
3918 | { | |
3919 | tzset (); | |
3920 | } | |
3921 | #endif | |
3922 | ||
3923 | /* If the variable exists, then the value of it can be the number | |
3924 | of times we actually ignore the EOF. The default is small, | |
3925 | (smaller than csh, anyway). */ | |
3926 | void | |
3927 | sv_ignoreeof (name) | |
3928 | char *name; | |
3929 | { | |
3930 | SHELL_VAR *tmp_var; | |
3931 | char *temp; | |
3932 | ||
3933 | eof_encountered = 0; | |
3934 | ||
3935 | tmp_var = find_variable (name); | |
3936 | ignoreeof = tmp_var != 0; | |
3937 | temp = tmp_var ? value_cell (tmp_var) : (char *)NULL; | |
3938 | if (temp) | |
3939 | eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10; | |
3940 | set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */ | |
3941 | } | |
3942 | ||
3943 | void | |
3944 | sv_optind (name) | |
3945 | char *name; | |
3946 | { | |
3947 | char *tt; | |
3948 | int s; | |
3949 | ||
3950 | tt = get_string_value ("OPTIND"); | |
3951 | if (tt && *tt) | |
3952 | { | |
3953 | s = atoi (tt); | |
3954 | ||
3955 | /* According to POSIX, setting OPTIND=1 resets the internal state | |
3956 | of getopt (). */ | |
3957 | if (s < 0 || s == 1) | |
3958 | s = 0; | |
3959 | } | |
3960 | else | |
3961 | s = 0; | |
3962 | getopts_reset (s); | |
3963 | } | |
3964 | ||
3965 | void | |
3966 | sv_opterr (name) | |
3967 | char *name; | |
3968 | { | |
3969 | char *tt; | |
3970 | ||
3971 | tt = get_string_value ("OPTERR"); | |
3972 | sh_opterr = (tt && *tt) ? atoi (tt) : 1; | |
3973 | } | |
3974 | ||
3975 | void | |
3976 | sv_strict_posix (name) | |
3977 | char *name; | |
3978 | { | |
3979 | SET_INT_VAR (name, posixly_correct); | |
3980 | posix_initialize (posixly_correct); | |
3981 | #if defined (READLINE) | |
3982 | if (interactive_shell) | |
3983 | posix_readline_initialize (posixly_correct); | |
3984 | #endif /* READLINE */ | |
3985 | set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */ | |
3986 | } | |
3987 | ||
3988 | void | |
3989 | sv_locale (name) | |
3990 | char *name; | |
3991 | { | |
3992 | char *v; | |
3993 | ||
3994 | v = get_string_value (name); | |
3995 | if (name[0] == 'L' && name[1] == 'A') /* LANG */ | |
3996 | set_lang (name, v); | |
3997 | else | |
3998 | set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */ | |
3999 | } | |
4000 | ||
4001 | #if defined (ARRAY_VARS) | |
4002 | void | |
7117c2d2 | 4003 | set_pipestatus_array (ps, nproc) |
cce855bc | 4004 | int *ps; |
7117c2d2 | 4005 | int nproc; |
cce855bc JA |
4006 | { |
4007 | SHELL_VAR *v; | |
4008 | ARRAY *a; | |
7117c2d2 | 4009 | ARRAY_ELEMENT *ae; |
cce855bc | 4010 | register int i; |
f73dda09 | 4011 | char *t, tbuf[INT_STRLEN_BOUND(int) + 1]; |
cce855bc JA |
4012 | |
4013 | v = find_variable ("PIPESTATUS"); | |
4014 | if (v == 0) | |
4015 | v = make_new_array_variable ("PIPESTATUS"); | |
4016 | if (array_p (v) == 0) | |
4017 | return; /* Do nothing if not an array variable. */ | |
4018 | a = array_cell (v); | |
7117c2d2 JA |
4019 | |
4020 | if (a == 0 || array_num_elements (a) == 0) | |
cce855bc | 4021 | { |
7117c2d2 JA |
4022 | for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */ |
4023 | { | |
4024 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4025 | array_insert (a, i, t); | |
4026 | } | |
4027 | return; | |
4028 | } | |
4029 | ||
4030 | /* Fast case */ | |
4031 | if (array_num_elements (a) == nproc && nproc == 1) | |
4032 | { | |
4033 | ae = element_forw (a->head); | |
4034 | free (element_value (ae)); | |
4035 | ae->value = itos (ps[0]); | |
4036 | } | |
4037 | else if (array_num_elements (a) <= nproc) | |
4038 | { | |
4039 | /* modify in array_num_elements members in place, then add */ | |
4040 | ae = a->head; | |
4041 | for (i = 0; i < array_num_elements (a); i++) | |
4042 | { | |
4043 | ae = element_forw (ae); | |
4044 | free (element_value (ae)); | |
4045 | ae->value = itos (ps[i]); | |
4046 | } | |
4047 | /* add any more */ | |
4048 | for ( ; i < nproc; i++) | |
4049 | { | |
4050 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4051 | array_insert (a, i, t); | |
4052 | } | |
4053 | } | |
4054 | else | |
4055 | { | |
4056 | /* deleting elements. it's faster to rebuild the array. */ | |
4057 | array_flush (a); | |
4058 | for (i = 0; ps[i] != -1; i++) | |
4059 | { | |
4060 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4061 | array_insert (a, i, t); | |
4062 | } | |
cce855bc JA |
4063 | } |
4064 | } | |
4065 | #endif | |
4066 | ||
4067 | void | |
4068 | set_pipestatus_from_exit (s) | |
4069 | int s; | |
4070 | { | |
4071 | #if defined (ARRAY_VARS) | |
4072 | static int v[2] = { 0, -1 }; | |
4073 | ||
4074 | v[0] = s; | |
7117c2d2 | 4075 | set_pipestatus_array (v, 1); |
cce855bc JA |
4076 | #endif |
4077 | } |