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Commit | Line | Data |
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726f6388 JA |
1 | /* variables.c -- Functions for hacking shell variables. */ |
2 | ||
95732b49 | 3 | /* Copyright (C) 1987-2005 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 | 27 | #if defined (qnx) |
95732b49 JA |
28 | # if defined (qnx6) |
29 | # include <sy/netmgr.h> | |
30 | # else | |
31 | # include <sys/vc.h> | |
32 | # endif /* !qnx6 */ | |
33 | #endif /* qnx */ | |
d166f048 | 34 | |
ccc6cda3 JA |
35 | #if defined (HAVE_UNISTD_H) |
36 | # include <unistd.h> | |
37 | #endif | |
38 | ||
39 | #include <stdio.h> | |
f73dda09 | 40 | #include "chartypes.h" |
726f6388 | 41 | #include <pwd.h> |
726f6388 | 42 | #include "bashansi.h" |
b80f6443 | 43 | #include "bashintl.h" |
ccc6cda3 | 44 | |
726f6388 | 45 | #include "shell.h" |
726f6388 JA |
46 | #include "flags.h" |
47 | #include "execute_cmd.h" | |
cce855bc | 48 | #include "findcmd.h" |
ccc6cda3 JA |
49 | #include "mailcheck.h" |
50 | #include "input.h" | |
f73dda09 JA |
51 | #include "hashcmd.h" |
52 | #include "pathexp.h" | |
726f6388 | 53 | |
d166f048 | 54 | #include "builtins/getopt.h" |
726f6388 | 55 | #include "builtins/common.h" |
cce855bc JA |
56 | |
57 | #if defined (READLINE) | |
58 | # include "bashline.h" | |
59 | # include <readline/readline.h> | |
60 | #else | |
61 | # include <tilde/tilde.h> | |
62 | #endif | |
726f6388 | 63 | |
ccc6cda3 JA |
64 | #if defined (HISTORY) |
65 | # include "bashhist.h" | |
cce855bc | 66 | # include <readline/history.h> |
ccc6cda3 JA |
67 | #endif /* HISTORY */ |
68 | ||
bb70624e JA |
69 | #if defined (PROGRAMMABLE_COMPLETION) |
70 | # include "pcomplete.h" | |
71 | #endif | |
72 | ||
7117c2d2 JA |
73 | #define TEMPENV_HASH_BUCKETS 4 /* must be power of two */ |
74 | ||
75 | #define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0') | |
76 | ||
95732b49 JA |
77 | extern char **environ; |
78 | ||
726f6388 JA |
79 | /* Variables used here and defined in other files. */ |
80 | extern int posixly_correct; | |
f73dda09 | 81 | extern int line_number; |
b80f6443 | 82 | extern int subshell_environment, indirection_level, subshell_level; |
ccc6cda3 | 83 | extern int build_version, patch_level; |
b80f6443 | 84 | extern int expanding_redir; |
ccc6cda3 | 85 | extern char *dist_version, *release_status; |
726f6388 JA |
86 | extern char *shell_name; |
87 | extern char *primary_prompt, *secondary_prompt; | |
ccc6cda3 | 88 | extern char *current_host_name; |
f73dda09 | 89 | extern sh_builtin_func_t *this_shell_builtin; |
bb70624e | 90 | extern SHELL_VAR *this_shell_function; |
b80f6443 | 91 | extern char *the_printed_command_except_trap; |
ccc6cda3 | 92 | extern char *this_command_name; |
b80f6443 | 93 | extern char *command_execution_string; |
726f6388 JA |
94 | extern time_t shell_start_time; |
95 | ||
b80f6443 | 96 | #if defined (READLINE) |
95732b49 | 97 | extern int no_line_editing; |
b80f6443 JA |
98 | extern int perform_hostname_completion; |
99 | #endif | |
100 | ||
7117c2d2 JA |
101 | /* The list of shell variables that the user has created at the global |
102 | scope, or that came from the environment. */ | |
103 | VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL; | |
104 | ||
105 | /* The current list of shell variables, including function scopes */ | |
106 | VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL; | |
726f6388 JA |
107 | |
108 | /* The list of shell functions that the user has created, or that came from | |
109 | the environment. */ | |
110 | HASH_TABLE *shell_functions = (HASH_TABLE *)NULL; | |
111 | ||
b80f6443 JA |
112 | #if defined (DEBUGGER) |
113 | /* The table of shell function definitions that the user defined or that | |
114 | came from the environment. */ | |
115 | HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL; | |
116 | #endif | |
117 | ||
726f6388 JA |
118 | /* The current variable context. This is really a count of how deep into |
119 | executing functions we are. */ | |
120 | int variable_context = 0; | |
121 | ||
7117c2d2 | 122 | /* The set of shell assignments which are made only in the environment |
726f6388 | 123 | for a single command. */ |
7117c2d2 | 124 | HASH_TABLE *temporary_env = (HASH_TABLE *)NULL; |
726f6388 | 125 | |
b80f6443 JA |
126 | /* Set to non-zero if an assignment error occurs while putting variables |
127 | into the temporary environment. */ | |
128 | int tempenv_assign_error; | |
129 | ||
726f6388 JA |
130 | /* Some funky variables which are known about specially. Here is where |
131 | "$*", "$1", and all the cruft is kept. */ | |
132 | char *dollar_vars[10]; | |
133 | WORD_LIST *rest_of_args = (WORD_LIST *)NULL; | |
134 | ||
135 | /* The value of $$. */ | |
f73dda09 | 136 | pid_t dollar_dollar_pid; |
726f6388 JA |
137 | |
138 | /* An array which is passed to commands as their environment. It is | |
d166f048 | 139 | manufactured from the union of the initial environment and the |
726f6388 JA |
140 | shell variables that are marked for export. */ |
141 | char **export_env = (char **)NULL; | |
d166f048 JA |
142 | static int export_env_index; |
143 | static int export_env_size; | |
726f6388 | 144 | |
95732b49 JA |
145 | #if defined (READLINE) |
146 | static int winsize_assignment; /* currently assigning to LINES or COLUMNS */ | |
147 | static int winsize_assigned; /* assigned to LINES or COLUMNS */ | |
148 | #endif | |
149 | ||
726f6388 JA |
150 | /* Non-zero means that we have to remake EXPORT_ENV. */ |
151 | int array_needs_making = 1; | |
152 | ||
ccc6cda3 JA |
153 | /* The number of times BASH has been executed. This is set |
154 | by initialize_variables (). */ | |
155 | int shell_level = 0; | |
726f6388 | 156 | |
726f6388 | 157 | /* Some forward declarations. */ |
f73dda09 JA |
158 | static void set_machine_vars __P((void)); |
159 | static void set_home_var __P((void)); | |
160 | static void set_shell_var __P((void)); | |
161 | static char *get_bash_name __P((void)); | |
162 | static void initialize_shell_level __P((void)); | |
163 | static void uidset __P((void)); | |
164 | #if defined (ARRAY_VARS) | |
165 | static void make_vers_array __P((void)); | |
166 | #endif | |
f73dda09 | 167 | |
7117c2d2 JA |
168 | static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t)); |
169 | #if defined (ARRAY_VARS) | |
170 | static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t)); | |
171 | #endif | |
b80f6443 JA |
172 | static SHELL_VAR *get_self __P((SHELL_VAR *)); |
173 | ||
174 | #if defined (ARRAY_VARS) | |
175 | static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int)); | |
176 | #endif | |
7117c2d2 JA |
177 | |
178 | static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t)); | |
179 | static SHELL_VAR *get_seconds __P((SHELL_VAR *)); | |
180 | static SHELL_VAR *init_seconds_var __P((void)); | |
181 | ||
182 | static int brand __P((void)); | |
f73dda09 | 183 | static void sbrand __P((unsigned long)); /* set bash random number generator. */ |
7117c2d2 JA |
184 | static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t)); |
185 | static SHELL_VAR *get_random __P((SHELL_VAR *)); | |
f73dda09 | 186 | |
7117c2d2 JA |
187 | static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t)); |
188 | static SHELL_VAR *get_lineno __P((SHELL_VAR *)); | |
f73dda09 | 189 | |
b80f6443 JA |
190 | static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t)); |
191 | static SHELL_VAR *get_subshell __P((SHELL_VAR *)); | |
192 | ||
7117c2d2 JA |
193 | #if defined (HISTORY) |
194 | static SHELL_VAR *get_histcmd __P((SHELL_VAR *)); | |
195 | #endif | |
196 | ||
197 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) | |
198 | static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t)); | |
199 | static SHELL_VAR *get_dirstack __P((SHELL_VAR *)); | |
7117c2d2 JA |
200 | #endif |
201 | ||
202 | #if defined (ARRAY_VARS) | |
203 | static SHELL_VAR *get_groupset __P((SHELL_VAR *)); | |
7117c2d2 JA |
204 | #endif |
205 | ||
206 | static SHELL_VAR *get_funcname __P((SHELL_VAR *)); | |
207 | static SHELL_VAR *init_funcname_var __P((void)); | |
208 | ||
209 | static void initialize_dynamic_variables __P((void)); | |
210 | ||
211 | static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *)); | |
f73dda09 | 212 | static SHELL_VAR *new_shell_variable __P((const char *)); |
7117c2d2 | 213 | static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *)); |
95732b49 | 214 | static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int)); |
7117c2d2 JA |
215 | |
216 | static void free_variable_hash_data __P((PTR_T)); | |
217 | ||
218 | static VARLIST *vlist_alloc __P((int)); | |
219 | static VARLIST *vlist_realloc __P((VARLIST *, int)); | |
220 | static void vlist_add __P((VARLIST *, SHELL_VAR *, int)); | |
221 | ||
222 | static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int)); | |
223 | ||
224 | static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **)); | |
f73dda09 | 225 | |
7117c2d2 JA |
226 | static SHELL_VAR **vapply __P((sh_var_map_func_t *)); |
227 | static SHELL_VAR **fapply __P((sh_var_map_func_t *)); | |
f73dda09 JA |
228 | |
229 | static int visible_var __P((SHELL_VAR *)); | |
f73dda09 | 230 | static int visible_and_exported __P((SHELL_VAR *)); |
7117c2d2 JA |
231 | static int local_and_exported __P((SHELL_VAR *)); |
232 | static int variable_in_context __P((SHELL_VAR *)); | |
f73dda09 JA |
233 | #if defined (ARRAY_VARS) |
234 | static int visible_array_vars __P((SHELL_VAR *)); | |
235 | #endif | |
236 | ||
7117c2d2 JA |
237 | static SHELL_VAR *bind_tempenv_variable __P((const char *, char *)); |
238 | static void push_temp_var __P((PTR_T)); | |
239 | static void propagate_temp_var __P((PTR_T)); | |
240 | static void dispose_temporary_env __P((sh_free_func_t *)); | |
241 | ||
f73dda09 | 242 | static inline char *mk_env_string __P((const char *, const char *)); |
7117c2d2 JA |
243 | static char **make_env_array_from_var_list __P((SHELL_VAR **)); |
244 | static char **make_var_export_array __P((VAR_CONTEXT *)); | |
245 | static char **make_func_export_array __P((void)); | |
246 | static void add_temp_array_to_env __P((char **, int, int)); | |
f73dda09 | 247 | |
7117c2d2 JA |
248 | static int n_shell_variables __P((void)); |
249 | static int set_context __P((SHELL_VAR *)); | |
726f6388 | 250 | |
7117c2d2 JA |
251 | static void push_func_var __P((PTR_T)); |
252 | static void push_exported_var __P((PTR_T)); | |
726f6388 | 253 | |
7117c2d2 JA |
254 | static inline int find_special_var __P((const char *)); |
255 | ||
cce855bc JA |
256 | /* Initialize the shell variables from the current environment. |
257 | If PRIVMODE is nonzero, don't import functions from ENV or | |
258 | parse $SHELLOPTS. */ | |
726f6388 | 259 | void |
cce855bc | 260 | initialize_shell_variables (env, privmode) |
726f6388 | 261 | char **env; |
cce855bc | 262 | int privmode; |
726f6388 | 263 | { |
ccc6cda3 JA |
264 | char *name, *string, *temp_string; |
265 | int c, char_index, string_index, string_length; | |
726f6388 JA |
266 | SHELL_VAR *temp_var; |
267 | ||
cce855bc | 268 | if (shell_variables == 0) |
7117c2d2 JA |
269 | { |
270 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
271 | shell_variables->scope = 0; | |
272 | shell_variables->table = hash_create (0); | |
273 | } | |
726f6388 | 274 | |
cce855bc | 275 | if (shell_functions == 0) |
7117c2d2 | 276 | shell_functions = hash_create (0); |
726f6388 | 277 | |
b80f6443 JA |
278 | #if defined (DEBUGGER) |
279 | if (shell_function_defs == 0) | |
280 | shell_function_defs = hash_create (0); | |
281 | #endif | |
282 | ||
ccc6cda3 | 283 | for (string_index = 0; string = env[string_index++]; ) |
726f6388 | 284 | { |
726f6388 | 285 | char_index = 0; |
d166f048 | 286 | name = string; |
726f6388 | 287 | while ((c = *string++) && c != '=') |
d166f048 JA |
288 | ; |
289 | if (string[-1] == '=') | |
28ef6c31 | 290 | char_index = string - name - 1; |
726f6388 | 291 | |
d166f048 JA |
292 | /* If there are weird things in the environment, like `=xxx' or a |
293 | string without an `=', just skip them. */ | |
294 | if (char_index == 0) | |
28ef6c31 | 295 | continue; |
d166f048 JA |
296 | |
297 | /* ASSERT(name[char_index] == '=') */ | |
726f6388 | 298 | name[char_index] = '\0'; |
d166f048 | 299 | /* Now, name = env variable name, string = env variable value, and |
28ef6c31 | 300 | char_index == strlen (name) */ |
726f6388 | 301 | |
f73dda09 | 302 | /* If exported function, define it now. Don't import functions from |
7117c2d2 | 303 | the environment in privileged mode. */ |
bb70624e | 304 | if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4)) |
726f6388 | 305 | { |
d166f048 | 306 | string_length = strlen (string); |
f73dda09 | 307 | temp_string = (char *)xmalloc (3 + string_length + char_index); |
bb70624e | 308 | |
d166f048 JA |
309 | strcpy (temp_string, name); |
310 | temp_string[char_index] = ' '; | |
311 | strcpy (temp_string + char_index + 1, string); | |
726f6388 | 312 | |
d166f048 | 313 | parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST); |
726f6388 | 314 | |
d166f048 JA |
315 | /* Ancient backwards compatibility. Old versions of bash exported |
316 | functions like name()=() {...} */ | |
317 | if (name[char_index - 1] == ')' && name[char_index - 2] == '(') | |
726f6388 JA |
318 | name[char_index - 2] = '\0'; |
319 | ||
ccc6cda3 | 320 | if (temp_var = find_function (name)) |
726f6388 | 321 | { |
bb70624e | 322 | VSETATTR (temp_var, (att_exported|att_imported)); |
726f6388 JA |
323 | array_needs_making = 1; |
324 | } | |
325 | else | |
b80f6443 | 326 | report_error (_("error importing function definition for `%s'"), name); |
d166f048 | 327 | |
bb70624e | 328 | /* ( */ |
d166f048 | 329 | if (name[char_index - 1] == ')' && name[char_index - 2] == '\0') |
bb70624e | 330 | name[char_index - 2] = '('; /* ) */ |
726f6388 | 331 | } |
ccc6cda3 JA |
332 | #if defined (ARRAY_VARS) |
333 | # if 0 | |
334 | /* Array variables may not yet be exported. */ | |
95732b49 | 335 | else if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')') |
ccc6cda3 JA |
336 | { |
337 | string_length = 1; | |
338 | temp_string = extract_array_assignment_list (string, &string_length); | |
339 | temp_var = assign_array_from_string (name, temp_string); | |
340 | FREE (temp_string); | |
bb70624e | 341 | VSETATTR (temp_var, (att_exported | att_imported)); |
ccc6cda3 JA |
342 | array_needs_making = 1; |
343 | } | |
344 | # endif | |
345 | #endif | |
726f6388 JA |
346 | else |
347 | { | |
95732b49 | 348 | temp_var = bind_variable (name, string, 0); |
bb70624e | 349 | VSETATTR (temp_var, (att_exported | att_imported)); |
726f6388 JA |
350 | array_needs_making = 1; |
351 | } | |
d166f048 JA |
352 | |
353 | name[char_index] = '='; | |
bb70624e | 354 | /* temp_var can be NULL if it was an exported function with a syntax |
28ef6c31 | 355 | error (a different bug, but it still shouldn't dump core). */ |
bb70624e JA |
356 | if (temp_var && function_p (temp_var) == 0) /* XXX not yet */ |
357 | { | |
358 | CACHE_IMPORTSTR (temp_var, name); | |
359 | } | |
726f6388 JA |
360 | } |
361 | ||
28ef6c31 | 362 | set_pwd (); |
b72432fd | 363 | |
ccc6cda3 | 364 | /* Set up initial value of $_ */ |
95732b49 JA |
365 | #if 0 |
366 | temp_var = bind_variable ("_", dollar_vars[0], 0); | |
367 | #else | |
368 | temp_var = set_if_not ("_", dollar_vars[0]); | |
369 | #endif | |
ccc6cda3 | 370 | |
726f6388 | 371 | /* Remember this pid. */ |
f73dda09 | 372 | dollar_dollar_pid = getpid (); |
726f6388 JA |
373 | |
374 | /* Now make our own defaults in case the vars that we think are | |
375 | important are missing. */ | |
376 | temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE); | |
f73dda09 JA |
377 | #if 0 |
378 | set_auto_export (temp_var); /* XXX */ | |
379 | #endif | |
726f6388 JA |
380 | |
381 | temp_var = set_if_not ("TERM", "dumb"); | |
f73dda09 JA |
382 | #if 0 |
383 | set_auto_export (temp_var); /* XXX */ | |
384 | #endif | |
726f6388 | 385 | |
d166f048 JA |
386 | #if defined (qnx) |
387 | /* set node id -- don't import it from the environment */ | |
388 | { | |
389 | char node_name[22]; | |
95732b49 JA |
390 | # if defined (qnx6) |
391 | netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name)); | |
392 | # else | |
d166f048 | 393 | qnx_nidtostr (getnid (), node_name, sizeof (node_name)); |
95732b49 JA |
394 | # endif |
395 | temp_var = bind_variable ("NODE", node_name, 0); | |
d166f048 JA |
396 | set_auto_export (temp_var); |
397 | } | |
398 | #endif | |
399 | ||
ccc6cda3 | 400 | /* set up the prompts. */ |
726f6388 JA |
401 | if (interactive_shell) |
402 | { | |
b72432fd | 403 | #if defined (PROMPT_STRING_DECODE) |
726f6388 | 404 | set_if_not ("PS1", primary_prompt); |
b72432fd JA |
405 | #else |
406 | if (current_user.uid == -1) | |
407 | get_current_user_info (); | |
408 | set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt); | |
409 | #endif | |
726f6388 JA |
410 | set_if_not ("PS2", secondary_prompt); |
411 | } | |
412 | set_if_not ("PS4", "+ "); | |
413 | ||
ccc6cda3 | 414 | /* Don't allow IFS to be imported from the environment. */ |
95732b49 | 415 | temp_var = bind_variable ("IFS", " \t\n", 0); |
7117c2d2 | 416 | setifs (temp_var); |
726f6388 JA |
417 | |
418 | /* Magic machine types. Pretty convenient. */ | |
f73dda09 | 419 | set_machine_vars (); |
726f6388 | 420 | |
ccc6cda3 JA |
421 | /* Default MAILCHECK for interactive shells. Defer the creation of a |
422 | default MAILPATH until the startup files are read, because MAIL | |
f73dda09 | 423 | names a mail file if MAILPATH is not set, and we should provide a |
ccc6cda3 | 424 | default only if neither is set. */ |
726f6388 | 425 | if (interactive_shell) |
95732b49 JA |
426 | { |
427 | temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60"); | |
428 | VSETATTR (temp_var, att_integer); | |
429 | } | |
726f6388 JA |
430 | |
431 | /* Do some things with shell level. */ | |
d166f048 | 432 | initialize_shell_level (); |
726f6388 | 433 | |
b72432fd | 434 | set_ppid (); |
726f6388 | 435 | |
726f6388 | 436 | /* Initialize the `getopts' stuff. */ |
95732b49 JA |
437 | temp_var = bind_variable ("OPTIND", "1", 0); |
438 | VSETATTR (temp_var, att_integer); | |
d166f048 | 439 | getopts_reset (0); |
95732b49 | 440 | bind_variable ("OPTERR", "1", 0); |
d166f048 JA |
441 | sh_opterr = 1; |
442 | ||
443 | if (login_shell == 1) | |
444 | set_home_var (); | |
726f6388 JA |
445 | |
446 | /* Get the full pathname to THIS shell, and set the BASH variable | |
447 | to it. */ | |
d166f048 | 448 | name = get_bash_name (); |
95732b49 | 449 | temp_var = bind_variable ("BASH", name, 0); |
ccc6cda3 JA |
450 | free (name); |
451 | ||
452 | /* Make the exported environment variable SHELL be the user's login | |
453 | shell. Note that the `tset' command looks at this variable | |
454 | to determine what style of commands to output; if it ends in "csh", | |
455 | then C-shell commands are output, else Bourne shell commands. */ | |
d166f048 | 456 | set_shell_var (); |
726f6388 JA |
457 | |
458 | /* Make a variable called BASH_VERSION which contains the version info. */ | |
95732b49 | 459 | bind_variable ("BASH_VERSION", shell_version_string (), 0); |
ccc6cda3 JA |
460 | #if defined (ARRAY_VARS) |
461 | make_vers_array (); | |
462 | #endif | |
726f6388 | 463 | |
b80f6443 | 464 | if (command_execution_string) |
95732b49 | 465 | bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0); |
b80f6443 | 466 | |
726f6388 JA |
467 | /* Find out if we're supposed to be in Posix.2 mode via an |
468 | environment variable. */ | |
469 | temp_var = find_variable ("POSIXLY_CORRECT"); | |
470 | if (!temp_var) | |
471 | temp_var = find_variable ("POSIX_PEDANTIC"); | |
472 | if (temp_var && imported_p (temp_var)) | |
473 | sv_strict_posix (temp_var->name); | |
474 | ||
475 | #if defined (HISTORY) | |
476 | /* Set history variables to defaults, and then do whatever we would | |
477 | do if the variable had just been set. Do this only in the case | |
478 | that we are remembering commands on the history list. */ | |
479 | if (remember_on_history) | |
480 | { | |
7117c2d2 | 481 | name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0); |
726f6388 JA |
482 | |
483 | set_if_not ("HISTFILE", name); | |
484 | free (name); | |
485 | ||
486 | set_if_not ("HISTSIZE", "500"); | |
487 | sv_histsize ("HISTSIZE"); | |
488 | } | |
489 | #endif /* HISTORY */ | |
490 | ||
491 | /* Seed the random number generator. */ | |
f73dda09 | 492 | sbrand (dollar_dollar_pid + shell_start_time); |
726f6388 JA |
493 | |
494 | /* Handle some "special" variables that we may have inherited from a | |
495 | parent shell. */ | |
d166f048 JA |
496 | if (interactive_shell) |
497 | { | |
498 | temp_var = find_variable ("IGNOREEOF"); | |
499 | if (!temp_var) | |
500 | temp_var = find_variable ("ignoreeof"); | |
501 | if (temp_var && imported_p (temp_var)) | |
502 | sv_ignoreeof (temp_var->name); | |
503 | } | |
726f6388 JA |
504 | |
505 | #if defined (HISTORY) | |
506 | if (interactive_shell && remember_on_history) | |
507 | { | |
ccc6cda3 JA |
508 | sv_history_control ("HISTCONTROL"); |
509 | sv_histignore ("HISTIGNORE"); | |
726f6388 JA |
510 | } |
511 | #endif /* HISTORY */ | |
512 | ||
95732b49 JA |
513 | #if defined (READLINE) && defined (STRICT_POSIX) |
514 | /* POSIXLY_CORRECT will only be 1 here if the shell was compiled | |
515 | -DSTRICT_POSIX */ | |
516 | if (interactive_shell && posixly_correct && no_line_editing == 0) | |
517 | rl_prefer_env_winsize = 1; | |
518 | #endif /* READLINE && STRICT_POSIX */ | |
519 | ||
f73dda09 JA |
520 | /* |
521 | * 24 October 2001 | |
522 | * | |
523 | * I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT | |
524 | * and SSH2_CLIENT alone. I'm going to rely on the shell_level check in | |
525 | * isnetconn() to avoid running the startup files more often than wanted. | |
526 | * That will, of course, only work if the user's login shell is bash, so | |
527 | * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined | |
528 | * in config-top.h. | |
529 | */ | |
530 | #if 0 | |
bb70624e | 531 | temp_var = find_variable ("SSH_CLIENT"); |
28ef6c31 JA |
532 | if (temp_var && imported_p (temp_var)) |
533 | { | |
534 | VUNSETATTR (temp_var, att_exported); | |
535 | array_needs_making = 1; | |
536 | } | |
537 | temp_var = find_variable ("SSH2_CLIENT"); | |
bb70624e JA |
538 | if (temp_var && imported_p (temp_var)) |
539 | { | |
540 | VUNSETATTR (temp_var, att_exported); | |
541 | array_needs_making = 1; | |
542 | } | |
f73dda09 | 543 | #endif |
bb70624e | 544 | |
ccc6cda3 JA |
545 | /* Get the user's real and effective user ids. */ |
546 | uidset (); | |
547 | ||
726f6388 JA |
548 | /* Initialize the dynamic variables, and seed their values. */ |
549 | initialize_dynamic_variables (); | |
726f6388 JA |
550 | } |
551 | ||
7117c2d2 JA |
552 | /* **************************************************************** */ |
553 | /* */ | |
554 | /* Setting values for special shell variables */ | |
555 | /* */ | |
556 | /* **************************************************************** */ | |
557 | ||
f73dda09 JA |
558 | static void |
559 | set_machine_vars () | |
560 | { | |
561 | SHELL_VAR *temp_var; | |
562 | ||
563 | temp_var = set_if_not ("HOSTTYPE", HOSTTYPE); | |
564 | temp_var = set_if_not ("OSTYPE", OSTYPE); | |
565 | temp_var = set_if_not ("MACHTYPE", MACHTYPE); | |
566 | ||
567 | temp_var = set_if_not ("HOSTNAME", current_host_name); | |
568 | } | |
569 | ||
d166f048 JA |
570 | /* Set $HOME to the information in the password file if we didn't get |
571 | it from the environment. */ | |
b72432fd JA |
572 | |
573 | /* This function is not static so the tilde and readline libraries can | |
574 | use it. */ | |
575 | char * | |
28ef6c31 | 576 | sh_get_home_dir () |
b72432fd JA |
577 | { |
578 | if (current_user.home_dir == 0) | |
579 | get_current_user_info (); | |
580 | return current_user.home_dir; | |
581 | } | |
582 | ||
d166f048 JA |
583 | static void |
584 | set_home_var () | |
585 | { | |
586 | SHELL_VAR *temp_var; | |
587 | ||
588 | temp_var = find_variable ("HOME"); | |
589 | if (temp_var == 0) | |
95732b49 | 590 | temp_var = bind_variable ("HOME", sh_get_home_dir (), 0); |
f73dda09 | 591 | #if 0 |
bb70624e | 592 | VSETATTR (temp_var, att_exported); |
f73dda09 | 593 | #endif |
d166f048 JA |
594 | } |
595 | ||
596 | /* Set $SHELL to the user's login shell if it is not already set. Call | |
597 | get_current_user_info if we haven't already fetched the shell. */ | |
598 | static void | |
599 | set_shell_var () | |
600 | { | |
601 | SHELL_VAR *temp_var; | |
602 | ||
603 | temp_var = find_variable ("SHELL"); | |
604 | if (temp_var == 0) | |
605 | { | |
606 | if (current_user.shell == 0) | |
607 | get_current_user_info (); | |
95732b49 | 608 | temp_var = bind_variable ("SHELL", current_user.shell, 0); |
d166f048 | 609 | } |
f73dda09 | 610 | #if 0 |
bb70624e | 611 | VSETATTR (temp_var, att_exported); |
f73dda09 | 612 | #endif |
d166f048 JA |
613 | } |
614 | ||
615 | static char * | |
616 | get_bash_name () | |
617 | { | |
618 | char *name; | |
619 | ||
28ef6c31 | 620 | if ((login_shell == 1) && RELPATH(shell_name)) |
d166f048 JA |
621 | { |
622 | if (current_user.shell == 0) | |
28ef6c31 | 623 | get_current_user_info (); |
d166f048 JA |
624 | name = savestring (current_user.shell); |
625 | } | |
28ef6c31 | 626 | else if (ABSPATH(shell_name)) |
d166f048 JA |
627 | name = savestring (shell_name); |
628 | else if (shell_name[0] == '.' && shell_name[1] == '/') | |
629 | { | |
630 | /* Fast path for common case. */ | |
631 | char *cdir; | |
632 | int len; | |
633 | ||
634 | cdir = get_string_value ("PWD"); | |
28ef6c31 JA |
635 | if (cdir) |
636 | { | |
637 | len = strlen (cdir); | |
f73dda09 | 638 | name = (char *)xmalloc (len + strlen (shell_name) + 1); |
28ef6c31 JA |
639 | strcpy (name, cdir); |
640 | strcpy (name + len, shell_name + 1); | |
641 | } | |
642 | else | |
643 | name = savestring (shell_name); | |
d166f048 JA |
644 | } |
645 | else | |
646 | { | |
647 | char *tname; | |
648 | int s; | |
649 | ||
650 | tname = find_user_command (shell_name); | |
651 | ||
652 | if (tname == 0) | |
653 | { | |
654 | /* Try the current directory. If there is not an executable | |
655 | there, just punt and use the login shell. */ | |
656 | s = file_status (shell_name); | |
657 | if (s & FS_EXECABLE) | |
658 | { | |
659 | tname = make_absolute (shell_name, get_string_value ("PWD")); | |
660 | if (*shell_name == '.') | |
661 | { | |
28ef6c31 | 662 | name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS); |
d166f048 JA |
663 | if (name == 0) |
664 | name = tname; | |
665 | else | |
666 | free (tname); | |
667 | } | |
668 | else | |
669 | name = tname; | |
670 | } | |
671 | else | |
672 | { | |
673 | if (current_user.shell == 0) | |
674 | get_current_user_info (); | |
675 | name = savestring (current_user.shell); | |
676 | } | |
677 | } | |
678 | else | |
679 | { | |
680 | name = full_pathname (tname); | |
681 | free (tname); | |
682 | } | |
683 | } | |
684 | ||
685 | return (name); | |
686 | } | |
687 | ||
726f6388 JA |
688 | void |
689 | adjust_shell_level (change) | |
690 | int change; | |
691 | { | |
d166f048 | 692 | char new_level[5], *old_SHLVL; |
7117c2d2 | 693 | intmax_t old_level; |
d166f048 | 694 | SHELL_VAR *temp_var; |
726f6388 JA |
695 | |
696 | old_SHLVL = get_string_value ("SHLVL"); | |
f73dda09 JA |
697 | if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0) |
698 | old_level = 0; | |
726f6388 JA |
699 | |
700 | shell_level = old_level + change; | |
701 | if (shell_level < 0) | |
702 | shell_level = 0; | |
d166f048 JA |
703 | else if (shell_level > 1000) |
704 | { | |
b80f6443 | 705 | internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level); |
d166f048 JA |
706 | shell_level = 1; |
707 | } | |
708 | ||
709 | /* We don't need the full generality of itos here. */ | |
710 | if (shell_level < 10) | |
711 | { | |
712 | new_level[0] = shell_level + '0'; | |
713 | new_level[1] = '\0'; | |
714 | } | |
715 | else if (shell_level < 100) | |
716 | { | |
717 | new_level[0] = (shell_level / 10) + '0'; | |
718 | new_level[1] = (shell_level % 10) + '0'; | |
719 | new_level[2] = '\0'; | |
720 | } | |
721 | else if (shell_level < 1000) | |
722 | { | |
723 | new_level[0] = (shell_level / 100) + '0'; | |
724 | old_level = shell_level % 100; | |
725 | new_level[1] = (old_level / 10) + '0'; | |
726 | new_level[2] = (old_level % 10) + '0'; | |
727 | new_level[3] = '\0'; | |
728 | } | |
729 | ||
95732b49 | 730 | temp_var = bind_variable ("SHLVL", new_level, 0); |
d166f048 JA |
731 | set_auto_export (temp_var); |
732 | } | |
733 | ||
734 | static void | |
735 | initialize_shell_level () | |
736 | { | |
d166f048 | 737 | adjust_shell_level (1); |
726f6388 JA |
738 | } |
739 | ||
28ef6c31 JA |
740 | /* If we got PWD from the environment, update our idea of the current |
741 | working directory. In any case, make sure that PWD exists before | |
742 | checking it. It is possible for getcwd () to fail on shell startup, | |
743 | and in that case, PWD would be undefined. If this is an interactive | |
744 | login shell, see if $HOME is the current working directory, and if | |
745 | that's not the same string as $PWD, set PWD=$HOME. */ | |
746 | ||
747 | void | |
748 | set_pwd () | |
749 | { | |
750 | SHELL_VAR *temp_var, *home_var; | |
751 | char *temp_string, *home_string; | |
752 | ||
753 | home_var = find_variable ("HOME"); | |
754 | home_string = home_var ? value_cell (home_var) : (char *)NULL; | |
755 | ||
756 | temp_var = find_variable ("PWD"); | |
757 | if (temp_var && imported_p (temp_var) && | |
758 | (temp_string = value_cell (temp_var)) && | |
759 | same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
760 | set_working_directory (temp_string); | |
761 | else if (home_string && interactive_shell && login_shell && | |
762 | same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
763 | { | |
764 | set_working_directory (home_string); | |
95732b49 | 765 | temp_var = bind_variable ("PWD", home_string, 0); |
28ef6c31 JA |
766 | set_auto_export (temp_var); |
767 | } | |
768 | else | |
769 | { | |
770 | temp_string = get_working_directory ("shell-init"); | |
771 | if (temp_string) | |
772 | { | |
95732b49 | 773 | temp_var = bind_variable ("PWD", temp_string, 0); |
28ef6c31 JA |
774 | set_auto_export (temp_var); |
775 | free (temp_string); | |
776 | } | |
777 | } | |
778 | ||
779 | /* According to the Single Unix Specification, v2, $OLDPWD is an | |
780 | `environment variable' and therefore should be auto-exported. | |
781 | Make a dummy invisible variable for OLDPWD, and mark it as exported. */ | |
95732b49 | 782 | temp_var = bind_variable ("OLDPWD", (char *)NULL, 0); |
28ef6c31 JA |
783 | VSETATTR (temp_var, (att_exported | att_invisible)); |
784 | } | |
785 | ||
b72432fd JA |
786 | /* Make a variable $PPID, which holds the pid of the shell's parent. */ |
787 | void | |
788 | set_ppid () | |
789 | { | |
f73dda09 | 790 | char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name; |
b72432fd JA |
791 | SHELL_VAR *temp_var; |
792 | ||
f73dda09 | 793 | name = inttostr (getppid (), namebuf, sizeof(namebuf)); |
b72432fd JA |
794 | temp_var = find_variable ("PPID"); |
795 | if (temp_var) | |
bb70624e | 796 | VUNSETATTR (temp_var, (att_readonly | att_exported)); |
95732b49 | 797 | temp_var = bind_variable ("PPID", name, 0); |
bb70624e | 798 | VSETATTR (temp_var, (att_readonly | att_integer)); |
b72432fd JA |
799 | } |
800 | ||
ccc6cda3 JA |
801 | static void |
802 | uidset () | |
726f6388 | 803 | { |
f73dda09 | 804 | char buff[INT_STRLEN_BOUND(uid_t) + 1], *b; |
ccc6cda3 JA |
805 | register SHELL_VAR *v; |
806 | ||
b72432fd | 807 | b = inttostr (current_user.uid, buff, sizeof (buff)); |
ccc6cda3 | 808 | v = find_variable ("UID"); |
28ef6c31 JA |
809 | if (v == 0) |
810 | { | |
95732b49 | 811 | v = bind_variable ("UID", b, 0); |
28ef6c31 JA |
812 | VSETATTR (v, (att_readonly | att_integer)); |
813 | } | |
726f6388 | 814 | |
ccc6cda3 | 815 | if (current_user.euid != current_user.uid) |
b72432fd | 816 | b = inttostr (current_user.euid, buff, sizeof (buff)); |
726f6388 | 817 | |
ccc6cda3 | 818 | v = find_variable ("EUID"); |
28ef6c31 JA |
819 | if (v == 0) |
820 | { | |
95732b49 | 821 | v = bind_variable ("EUID", b, 0); |
28ef6c31 JA |
822 | VSETATTR (v, (att_readonly | att_integer)); |
823 | } | |
ccc6cda3 JA |
824 | } |
825 | ||
826 | #if defined (ARRAY_VARS) | |
827 | static void | |
828 | make_vers_array () | |
829 | { | |
830 | SHELL_VAR *vv; | |
831 | ARRAY *av; | |
f73dda09 | 832 | char *s, d[32], b[INT_STRLEN_BOUND(int) + 1]; |
ccc6cda3 | 833 | |
7117c2d2 | 834 | unbind_variable ("BASH_VERSINFO"); |
ccc6cda3 JA |
835 | |
836 | vv = make_new_array_variable ("BASH_VERSINFO"); | |
837 | av = array_cell (vv); | |
838 | strcpy (d, dist_version); | |
7117c2d2 | 839 | s = xstrchr (d, '.'); |
ccc6cda3 JA |
840 | if (s) |
841 | *s++ = '\0'; | |
7117c2d2 JA |
842 | array_insert (av, 0, d); |
843 | array_insert (av, 1, s); | |
f73dda09 | 844 | s = inttostr (patch_level, b, sizeof (b)); |
7117c2d2 | 845 | array_insert (av, 2, s); |
f73dda09 | 846 | s = inttostr (build_version, b, sizeof (b)); |
7117c2d2 JA |
847 | array_insert (av, 3, s); |
848 | array_insert (av, 4, release_status); | |
849 | array_insert (av, 5, MACHTYPE); | |
ccc6cda3 | 850 | |
bb70624e | 851 | VSETATTR (vv, att_readonly); |
ccc6cda3 JA |
852 | } |
853 | #endif /* ARRAY_VARS */ | |
854 | ||
855 | /* Set the environment variables $LINES and $COLUMNS in response to | |
856 | a window size change. */ | |
857 | void | |
28ef6c31 | 858 | sh_set_lines_and_columns (lines, cols) |
ccc6cda3 JA |
859 | int lines, cols; |
860 | { | |
f73dda09 | 861 | char val[INT_STRLEN_BOUND(int) + 1], *v; |
ccc6cda3 | 862 | |
95732b49 JA |
863 | /* If we are currently assigning to LINES or COLUMNS, don't do anything. */ |
864 | if (winsize_assignment) | |
865 | return; | |
866 | ||
b72432fd | 867 | v = inttostr (lines, val, sizeof (val)); |
95732b49 | 868 | bind_variable ("LINES", v, 0); |
ccc6cda3 | 869 | |
b72432fd | 870 | v = inttostr (cols, val, sizeof (val)); |
95732b49 | 871 | bind_variable ("COLUMNS", v, 0); |
726f6388 JA |
872 | } |
873 | ||
7117c2d2 JA |
874 | /* **************************************************************** */ |
875 | /* */ | |
876 | /* Printing variables and values */ | |
877 | /* */ | |
878 | /* **************************************************************** */ | |
726f6388 | 879 | |
28ef6c31 JA |
880 | /* Print LIST (a list of shell variables) to stdout in such a way that |
881 | they can be read back in. */ | |
726f6388 JA |
882 | void |
883 | print_var_list (list) | |
884 | register SHELL_VAR **list; | |
885 | { | |
886 | register int i; | |
887 | register SHELL_VAR *var; | |
888 | ||
889 | for (i = 0; list && (var = list[i]); i++) | |
7117c2d2 | 890 | if (invisible_p (var) == 0) |
726f6388 JA |
891 | print_assignment (var); |
892 | } | |
893 | ||
28ef6c31 JA |
894 | /* Print LIST (a list of shell functions) to stdout in such a way that |
895 | they can be read back in. */ | |
896 | void | |
897 | print_func_list (list) | |
898 | register SHELL_VAR **list; | |
899 | { | |
900 | register int i; | |
901 | register SHELL_VAR *var; | |
902 | ||
903 | for (i = 0; list && (var = list[i]); i++) | |
904 | { | |
905 | printf ("%s ", var->name); | |
906 | print_var_function (var); | |
907 | printf ("\n"); | |
908 | } | |
909 | } | |
910 | ||
726f6388 JA |
911 | /* Print the value of a single SHELL_VAR. No newline is |
912 | output, but the variable is printed in such a way that | |
913 | it can be read back in. */ | |
914 | void | |
915 | print_assignment (var) | |
916 | SHELL_VAR *var; | |
917 | { | |
7117c2d2 JA |
918 | if (var_isset (var) == 0) |
919 | return; | |
920 | ||
921 | if (function_p (var)) | |
726f6388 | 922 | { |
28ef6c31 | 923 | printf ("%s", var->name); |
726f6388 JA |
924 | print_var_function (var); |
925 | printf ("\n"); | |
926 | } | |
ccc6cda3 | 927 | #if defined (ARRAY_VARS) |
7117c2d2 | 928 | else if (array_p (var)) |
ccc6cda3 JA |
929 | print_array_assignment (var, 0); |
930 | #endif /* ARRAY_VARS */ | |
7117c2d2 | 931 | else |
726f6388 JA |
932 | { |
933 | printf ("%s=", var->name); | |
ccc6cda3 | 934 | print_var_value (var, 1); |
726f6388 JA |
935 | printf ("\n"); |
936 | } | |
937 | } | |
938 | ||
939 | /* Print the value cell of VAR, a shell variable. Do not print | |
ccc6cda3 JA |
940 | the name, nor leading/trailing newline. If QUOTE is non-zero, |
941 | and the value contains shell metacharacters, quote the value | |
942 | in such a way that it can be read back in. */ | |
726f6388 | 943 | void |
ccc6cda3 | 944 | print_var_value (var, quote) |
726f6388 | 945 | SHELL_VAR *var; |
ccc6cda3 | 946 | int quote; |
726f6388 | 947 | { |
ccc6cda3 JA |
948 | char *t; |
949 | ||
7117c2d2 JA |
950 | if (var_isset (var) == 0) |
951 | return; | |
952 | ||
953 | if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var))) | |
ccc6cda3 | 954 | { |
7117c2d2 JA |
955 | t = ansic_quote (value_cell (var), 0, (int *)0); |
956 | printf ("%s", t); | |
957 | free (t); | |
958 | } | |
959 | else if (quote && sh_contains_shell_metas (value_cell (var))) | |
960 | { | |
961 | t = sh_single_quote (value_cell (var)); | |
962 | printf ("%s", t); | |
963 | free (t); | |
ccc6cda3 | 964 | } |
7117c2d2 JA |
965 | else |
966 | printf ("%s", value_cell (var)); | |
726f6388 JA |
967 | } |
968 | ||
969 | /* Print the function cell of VAR, a shell variable. Do not | |
970 | print the name, nor leading/trailing newline. */ | |
971 | void | |
972 | print_var_function (var) | |
973 | SHELL_VAR *var; | |
974 | { | |
7117c2d2 | 975 | if (function_p (var) && var_isset (var)) |
726f6388 JA |
976 | printf ("%s", named_function_string ((char *)NULL, function_cell(var), 1)); |
977 | } | |
978 | ||
979 | /* **************************************************************** */ | |
ccc6cda3 | 980 | /* */ |
7117c2d2 | 981 | /* Dynamic Variables */ |
ccc6cda3 | 982 | /* */ |
726f6388 JA |
983 | /* **************************************************************** */ |
984 | ||
985 | /* DYNAMIC VARIABLES | |
ccc6cda3 | 986 | |
726f6388 JA |
987 | These are variables whose values are generated anew each time they are |
988 | referenced. These are implemented using a pair of function pointers | |
7117c2d2 JA |
989 | in the struct variable: assign_func, which is called from bind_variable |
990 | and, if arrays are compiled into the shell, some of the functions in | |
991 | arrayfunc.c, and dynamic_value, which is called from find_variable. | |
992 | ||
993 | assign_func is called from bind_variable_internal, if | |
994 | bind_variable_internal discovers that the variable being assigned to | |
995 | has such a function. The function is called as | |
996 | SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind) | |
726f6388 | 997 | and the (SHELL_VAR *)temp is returned as the value of bind_variable. It |
7117c2d2 JA |
998 | is usually ENTRY (self). IND is an index for an array variable, and |
999 | unused otherwise. | |
ccc6cda3 | 1000 | |
7117c2d2 JA |
1001 | dynamic_value is called from find_variable_internal to return a `new' |
1002 | value for the specified dynamic varible. If this function is NULL, | |
1003 | the variable is treated as a `normal' shell variable. If it is not, | |
1004 | however, then this function is called like this: | |
1005 | tempvar = (*(var->dynamic_value)) (var); | |
ccc6cda3 | 1006 | |
726f6388 JA |
1007 | Sometimes `tempvar' will replace the value of `var'. Other times, the |
1008 | shell will simply use the string value. Pretty object-oriented, huh? | |
ccc6cda3 | 1009 | |
726f6388 JA |
1010 | Be warned, though: if you `unset' a special variable, it loses its |
1011 | special meaning, even if you subsequently set it. | |
ccc6cda3 | 1012 | |
726f6388 | 1013 | The special assignment code would probably have been better put in |
7117c2d2 | 1014 | subst.c: do_assignment_internal, in the same style as |
726f6388 JA |
1015 | stupidly_hack_special_variables, but I wanted the changes as |
1016 | localized as possible. */ | |
1017 | ||
f73dda09 JA |
1018 | #define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \ |
1019 | do \ | |
1020 | { \ | |
95732b49 | 1021 | v = bind_variable (var, (val), 0); \ |
f73dda09 JA |
1022 | v->dynamic_value = gfunc; \ |
1023 | v->assign_func = afunc; \ | |
1024 | } \ | |
1025 | while (0) | |
1026 | ||
1027 | #define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \ | |
1028 | do \ | |
1029 | { \ | |
1030 | v = make_new_array_variable (var); \ | |
1031 | v->dynamic_value = gfunc; \ | |
1032 | v->assign_func = afunc; \ | |
1033 | } \ | |
1034 | while (0) | |
1035 | ||
bb70624e | 1036 | static SHELL_VAR * |
7117c2d2 | 1037 | null_assign (self, value, unused) |
bb70624e JA |
1038 | SHELL_VAR *self; |
1039 | char *value; | |
7117c2d2 | 1040 | arrayind_t unused; |
bb70624e JA |
1041 | { |
1042 | return (self); | |
1043 | } | |
1044 | ||
1045 | #if defined (ARRAY_VARS) | |
1046 | static SHELL_VAR * | |
7117c2d2 | 1047 | null_array_assign (self, value, ind) |
bb70624e | 1048 | SHELL_VAR *self; |
bb70624e | 1049 | char *value; |
7117c2d2 | 1050 | arrayind_t ind; |
bb70624e JA |
1051 | { |
1052 | return (self); | |
1053 | } | |
1054 | #endif | |
1055 | ||
b80f6443 JA |
1056 | /* Degenerate `dynamic_value' function; just returns what's passed without |
1057 | manipulation. */ | |
1058 | static SHELL_VAR * | |
1059 | get_self (self) | |
1060 | SHELL_VAR *self; | |
1061 | { | |
1062 | return (self); | |
1063 | } | |
1064 | ||
1065 | #if defined (ARRAY_VARS) | |
1066 | /* A generic dynamic array variable initializer. Intialize array variable | |
1067 | NAME with dynamic value function GETFUNC and assignment function SETFUNC. */ | |
1068 | static SHELL_VAR * | |
1069 | init_dynamic_array_var (name, getfunc, setfunc, attrs) | |
1070 | char *name; | |
1071 | sh_var_value_func_t *getfunc; | |
1072 | sh_var_assign_func_t *setfunc; | |
1073 | int attrs; | |
1074 | { | |
1075 | SHELL_VAR *v; | |
1076 | ||
1077 | v = find_variable (name); | |
1078 | if (v) | |
1079 | return (v); | |
1080 | INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc); | |
1081 | if (attrs) | |
1082 | VSETATTR (v, attrs); | |
1083 | return v; | |
1084 | } | |
1085 | #endif | |
1086 | ||
1087 | ||
726f6388 JA |
1088 | /* The value of $SECONDS. This is the number of seconds since shell |
1089 | invocation, or, the number of seconds since the last assignment + the | |
1090 | value of the last assignment. */ | |
7117c2d2 | 1091 | static intmax_t seconds_value_assigned; |
726f6388 JA |
1092 | |
1093 | static SHELL_VAR * | |
7117c2d2 | 1094 | assign_seconds (self, value, unused) |
726f6388 JA |
1095 | SHELL_VAR *self; |
1096 | char *value; | |
7117c2d2 | 1097 | arrayind_t unused; |
726f6388 | 1098 | { |
f73dda09 JA |
1099 | if (legal_number (value, &seconds_value_assigned) == 0) |
1100 | seconds_value_assigned = 0; | |
726f6388 JA |
1101 | shell_start_time = NOW; |
1102 | return (self); | |
1103 | } | |
1104 | ||
1105 | static SHELL_VAR * | |
1106 | get_seconds (var) | |
1107 | SHELL_VAR *var; | |
1108 | { | |
1109 | time_t time_since_start; | |
1110 | char *p; | |
1111 | ||
1112 | time_since_start = NOW - shell_start_time; | |
f73dda09 | 1113 | p = itos(seconds_value_assigned + time_since_start); |
726f6388 | 1114 | |
7117c2d2 | 1115 | FREE (value_cell (var)); |
726f6388 | 1116 | |
bb70624e | 1117 | VSETATTR (var, att_integer); |
7117c2d2 | 1118 | var_setvalue (var, p); |
726f6388 JA |
1119 | return (var); |
1120 | } | |
1121 | ||
f73dda09 JA |
1122 | static SHELL_VAR * |
1123 | init_seconds_var () | |
1124 | { | |
1125 | SHELL_VAR *v; | |
1126 | ||
1127 | v = find_variable ("SECONDS"); | |
1128 | if (v) | |
1129 | { | |
1130 | if (legal_number (value_cell(v), &seconds_value_assigned) == 0) | |
1131 | seconds_value_assigned = 0; | |
1132 | } | |
7117c2d2 | 1133 | INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds); |
f73dda09 JA |
1134 | return v; |
1135 | } | |
1136 | ||
726f6388 JA |
1137 | /* The random number seed. You can change this by setting RANDOM. */ |
1138 | static unsigned long rseed = 1; | |
f73dda09 | 1139 | static int last_random_value; |
95732b49 | 1140 | static int seeded_subshell = 0; |
726f6388 | 1141 | |
f73dda09 | 1142 | /* A linear congruential random number generator based on the example |
7117c2d2 | 1143 | one in the ANSI C standard. This one isn't very good, but a more |
f73dda09 | 1144 | complicated one is overkill. */ |
726f6388 JA |
1145 | |
1146 | /* Returns a pseudo-random number between 0 and 32767. */ | |
1147 | static int | |
1148 | brand () | |
1149 | { | |
1150 | rseed = rseed * 1103515245 + 12345; | |
f73dda09 | 1151 | return ((unsigned int)((rseed >> 16) & 32767)); /* was % 32768 */ |
726f6388 JA |
1152 | } |
1153 | ||
1154 | /* Set the random number generator seed to SEED. */ | |
1155 | static void | |
1156 | sbrand (seed) | |
f73dda09 | 1157 | unsigned long seed; |
726f6388 JA |
1158 | { |
1159 | rseed = seed; | |
e8ce775d | 1160 | last_random_value = 0; |
726f6388 JA |
1161 | } |
1162 | ||
1163 | static SHELL_VAR * | |
7117c2d2 | 1164 | assign_random (self, value, unused) |
726f6388 JA |
1165 | SHELL_VAR *self; |
1166 | char *value; | |
7117c2d2 | 1167 | arrayind_t unused; |
726f6388 | 1168 | { |
f73dda09 | 1169 | sbrand (strtoul (value, (char **)NULL, 10)); |
95732b49 JA |
1170 | if (subshell_environment) |
1171 | seeded_subshell = 1; | |
726f6388 JA |
1172 | return (self); |
1173 | } | |
1174 | ||
28ef6c31 JA |
1175 | int |
1176 | get_random_number () | |
726f6388 JA |
1177 | { |
1178 | int rv; | |
726f6388 | 1179 | |
ccc6cda3 | 1180 | /* Reset for command and process substitution. */ |
95732b49 JA |
1181 | if (subshell_environment && seeded_subshell == 0) |
1182 | { | |
1183 | sbrand (rseed + getpid() + NOW); | |
1184 | seeded_subshell = 1; | |
1185 | } | |
ccc6cda3 JA |
1186 | |
1187 | do | |
1188 | rv = brand (); | |
f73dda09 | 1189 | while (rv == last_random_value); |
28ef6c31 JA |
1190 | return rv; |
1191 | } | |
ccc6cda3 | 1192 | |
28ef6c31 JA |
1193 | static SHELL_VAR * |
1194 | get_random (var) | |
1195 | SHELL_VAR *var; | |
1196 | { | |
1197 | int rv; | |
1198 | char *p; | |
1199 | ||
1200 | rv = get_random_number (); | |
ccc6cda3 | 1201 | last_random_value = rv; |
f73dda09 | 1202 | p = itos (rv); |
726f6388 | 1203 | |
7117c2d2 | 1204 | FREE (value_cell (var)); |
726f6388 | 1205 | |
bb70624e | 1206 | VSETATTR (var, att_integer); |
7117c2d2 | 1207 | var_setvalue (var, p); |
726f6388 JA |
1208 | return (var); |
1209 | } | |
1210 | ||
7117c2d2 JA |
1211 | static SHELL_VAR * |
1212 | assign_lineno (var, value, unused) | |
1213 | SHELL_VAR *var; | |
1214 | char *value; | |
1215 | arrayind_t unused; | |
1216 | { | |
1217 | intmax_t new_value; | |
1218 | ||
1219 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1220 | new_value = 0; | |
1221 | line_number = new_value; | |
1222 | return var; | |
1223 | } | |
1224 | ||
726f6388 JA |
1225 | /* Function which returns the current line number. */ |
1226 | static SHELL_VAR * | |
1227 | get_lineno (var) | |
1228 | SHELL_VAR *var; | |
1229 | { | |
1230 | char *p; | |
ccc6cda3 | 1231 | int ln; |
726f6388 | 1232 | |
ccc6cda3 JA |
1233 | ln = executing_line_number (); |
1234 | p = itos (ln); | |
7117c2d2 JA |
1235 | FREE (value_cell (var)); |
1236 | var_setvalue (var, p); | |
726f6388 JA |
1237 | return (var); |
1238 | } | |
1239 | ||
b80f6443 JA |
1240 | static SHELL_VAR * |
1241 | assign_subshell (var, value, unused) | |
1242 | SHELL_VAR *var; | |
1243 | char *value; | |
1244 | arrayind_t unused; | |
1245 | { | |
1246 | intmax_t new_value; | |
1247 | ||
1248 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1249 | new_value = 0; | |
1250 | subshell_level = new_value; | |
1251 | return var; | |
1252 | } | |
1253 | ||
1254 | static SHELL_VAR * | |
1255 | get_subshell (var) | |
1256 | SHELL_VAR *var; | |
1257 | { | |
1258 | char *p; | |
1259 | ||
1260 | p = itos (subshell_level); | |
1261 | FREE (value_cell (var)); | |
1262 | var_setvalue (var, p); | |
1263 | return (var); | |
1264 | } | |
1265 | ||
1266 | static SHELL_VAR * | |
1267 | get_bash_command (var) | |
1268 | SHELL_VAR *var; | |
1269 | { | |
1270 | char *p; | |
1271 | ||
95732b49 JA |
1272 | |
1273 | if (the_printed_command_except_trap) | |
1274 | p = savestring (the_printed_command_except_trap); | |
1275 | else | |
1276 | { | |
1277 | p = (char *)xmalloc (1); | |
1278 | p[0] = '\0'; | |
1279 | } | |
b80f6443 JA |
1280 | FREE (value_cell (var)); |
1281 | var_setvalue (var, p); | |
1282 | return (var); | |
1283 | } | |
1284 | ||
726f6388 JA |
1285 | #if defined (HISTORY) |
1286 | static SHELL_VAR * | |
1287 | get_histcmd (var) | |
1288 | SHELL_VAR *var; | |
1289 | { | |
1290 | char *p; | |
1291 | ||
1292 | p = itos (history_number ()); | |
7117c2d2 JA |
1293 | FREE (value_cell (var)); |
1294 | var_setvalue (var, p); | |
726f6388 JA |
1295 | return (var); |
1296 | } | |
1297 | #endif | |
1298 | ||
b80f6443 JA |
1299 | #if defined (READLINE) |
1300 | /* When this function returns, VAR->value points to malloced memory. */ | |
1301 | static SHELL_VAR * | |
1302 | get_comp_wordbreaks (var) | |
1303 | SHELL_VAR *var; | |
1304 | { | |
1305 | char *p; | |
1306 | ||
1307 | /* If we don't have anything yet, assign a default value. */ | |
1308 | if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0) | |
1309 | enable_hostname_completion (perform_hostname_completion); | |
1310 | ||
1311 | #if 0 | |
1312 | FREE (value_cell (var)); | |
1313 | p = savestring (rl_completer_word_break_characters); | |
1314 | ||
1315 | var_setvalue (var, p); | |
1316 | #else | |
1317 | var_setvalue (var, rl_completer_word_break_characters); | |
1318 | #endif | |
1319 | ||
1320 | return (var); | |
1321 | } | |
1322 | ||
1323 | /* When this function returns, rl_completer_word_break_characters points to | |
1324 | malloced memory. */ | |
1325 | static SHELL_VAR * | |
1326 | assign_comp_wordbreaks (self, value, unused) | |
1327 | SHELL_VAR *self; | |
1328 | char *value; | |
1329 | arrayind_t unused; | |
1330 | { | |
1331 | if (rl_completer_word_break_characters && | |
1332 | rl_completer_word_break_characters != rl_basic_word_break_characters) | |
1333 | free (rl_completer_word_break_characters); | |
1334 | ||
1335 | rl_completer_word_break_characters = savestring (value); | |
1336 | return self; | |
1337 | } | |
1338 | #endif /* READLINE */ | |
1339 | ||
ccc6cda3 | 1340 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) |
b80f6443 | 1341 | static SHELL_VAR * |
7117c2d2 JA |
1342 | assign_dirstack (self, value, ind) |
1343 | SHELL_VAR *self; | |
1344 | char *value; | |
1345 | arrayind_t ind; | |
1346 | { | |
1347 | set_dirstack_element (ind, 1, value); | |
1348 | return self; | |
1349 | } | |
1350 | ||
ccc6cda3 JA |
1351 | static SHELL_VAR * |
1352 | get_dirstack (self) | |
1353 | SHELL_VAR *self; | |
1354 | { | |
1355 | ARRAY *a; | |
1356 | WORD_LIST *l; | |
1357 | ||
1358 | l = get_directory_stack (); | |
7117c2d2 JA |
1359 | a = array_from_word_list (l); |
1360 | array_dispose (array_cell (self)); | |
d166f048 | 1361 | dispose_words (l); |
7117c2d2 | 1362 | var_setarray (self, a); |
ccc6cda3 JA |
1363 | return self; |
1364 | } | |
1365 | #endif /* PUSHD AND POPD && ARRAY_VARS */ | |
1366 | ||
d166f048 JA |
1367 | #if defined (ARRAY_VARS) |
1368 | /* We don't want to initialize the group set with a call to getgroups() | |
1369 | unless we're asked to, but we only want to do it once. */ | |
1370 | static SHELL_VAR * | |
1371 | get_groupset (self) | |
1372 | SHELL_VAR *self; | |
1373 | { | |
1374 | register int i; | |
1375 | int ng; | |
1376 | ARRAY *a; | |
1377 | static char **group_set = (char **)NULL; | |
1378 | ||
1379 | if (group_set == 0) | |
1380 | { | |
1381 | group_set = get_group_list (&ng); | |
1382 | a = array_cell (self); | |
1383 | for (i = 0; i < ng; i++) | |
7117c2d2 | 1384 | array_insert (a, i, group_set[i]); |
d166f048 JA |
1385 | } |
1386 | return (self); | |
1387 | } | |
1388 | #endif /* ARRAY_VARS */ | |
bb70624e | 1389 | |
b80f6443 JA |
1390 | /* If ARRAY_VARS is not defined, this just returns the name of any |
1391 | currently-executing function. If we have arrays, it's a call stack. */ | |
bb70624e JA |
1392 | static SHELL_VAR * |
1393 | get_funcname (self) | |
1394 | SHELL_VAR *self; | |
1395 | { | |
b80f6443 | 1396 | #if ! defined (ARRAY_VARS) |
7117c2d2 | 1397 | char *t; |
bb70624e JA |
1398 | if (variable_context && this_shell_function) |
1399 | { | |
7117c2d2 JA |
1400 | FREE (value_cell (self)); |
1401 | t = savestring (this_shell_function->name); | |
1402 | var_setvalue (self, t); | |
bb70624e | 1403 | } |
b80f6443 | 1404 | #endif |
bb70624e JA |
1405 | return (self); |
1406 | } | |
1407 | ||
1408 | void | |
1409 | make_funcname_visible (on_or_off) | |
1410 | int on_or_off; | |
726f6388 JA |
1411 | { |
1412 | SHELL_VAR *v; | |
1413 | ||
bb70624e JA |
1414 | v = find_variable ("FUNCNAME"); |
1415 | if (v == 0 || v->dynamic_value == 0) | |
1416 | return; | |
1417 | ||
1418 | if (on_or_off) | |
1419 | VUNSETATTR (v, att_invisible); | |
1420 | else | |
1421 | VSETATTR (v, att_invisible); | |
1422 | } | |
1423 | ||
f73dda09 JA |
1424 | static SHELL_VAR * |
1425 | init_funcname_var () | |
1426 | { | |
1427 | SHELL_VAR *v; | |
bb70624e | 1428 | |
f73dda09 JA |
1429 | v = find_variable ("FUNCNAME"); |
1430 | if (v) | |
1431 | return v; | |
b80f6443 JA |
1432 | #if defined (ARRAY_VARS) |
1433 | INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign); | |
1434 | #else | |
f73dda09 | 1435 | INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign); |
b80f6443 | 1436 | #endif |
f73dda09 JA |
1437 | VSETATTR (v, att_invisible|att_noassign); |
1438 | return v; | |
1439 | } | |
726f6388 | 1440 | |
bb70624e JA |
1441 | static void |
1442 | initialize_dynamic_variables () | |
1443 | { | |
1444 | SHELL_VAR *v; | |
726f6388 | 1445 | |
f73dda09 JA |
1446 | v = init_seconds_var (); |
1447 | ||
b80f6443 JA |
1448 | INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL); |
1449 | INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell); | |
1450 | ||
bb70624e | 1451 | INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random); |
95732b49 | 1452 | VSETATTR (v, att_integer); |
bb70624e | 1453 | INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno); |
95732b49 | 1454 | VSETATTR (v, att_integer); |
726f6388 JA |
1455 | |
1456 | #if defined (HISTORY) | |
7117c2d2 | 1457 | INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL); |
95732b49 | 1458 | VSETATTR (v, att_integer); |
726f6388 | 1459 | #endif |
ccc6cda3 | 1460 | |
b80f6443 JA |
1461 | #if defined (READLINE) |
1462 | INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks); | |
1463 | #endif | |
1464 | ||
ccc6cda3 | 1465 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) |
b80f6443 | 1466 | v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0); |
ccc6cda3 | 1467 | #endif /* PUSHD_AND_POPD && ARRAY_VARS */ |
d166f048 JA |
1468 | |
1469 | #if defined (ARRAY_VARS) | |
b80f6443 JA |
1470 | v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign); |
1471 | ||
1472 | # if defined (DEBUGGER) | |
95732b49 JA |
1473 | v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset); |
1474 | v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset); | |
b80f6443 | 1475 | # endif /* DEBUGGER */ |
95732b49 JA |
1476 | v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset); |
1477 | v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset); | |
d166f048 | 1478 | #endif |
bb70624e | 1479 | |
f73dda09 | 1480 | v = init_funcname_var (); |
726f6388 JA |
1481 | } |
1482 | ||
7117c2d2 JA |
1483 | /* **************************************************************** */ |
1484 | /* */ | |
1485 | /* Retrieving variables and values */ | |
1486 | /* */ | |
1487 | /* **************************************************************** */ | |
1488 | ||
726f6388 JA |
1489 | /* How to get a pointer to the shell variable or function named NAME. |
1490 | HASHED_VARS is a pointer to the hash table containing the list | |
1491 | of interest (either variables or functions). */ | |
7117c2d2 JA |
1492 | |
1493 | static SHELL_VAR * | |
1494 | hash_lookup (name, hashed_vars) | |
f73dda09 | 1495 | const char *name; |
726f6388 JA |
1496 | HASH_TABLE *hashed_vars; |
1497 | { | |
1498 | BUCKET_CONTENTS *bucket; | |
1499 | ||
7117c2d2 | 1500 | bucket = hash_search (name, hashed_vars, 0); |
ccc6cda3 | 1501 | return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL); |
726f6388 JA |
1502 | } |
1503 | ||
7117c2d2 JA |
1504 | SHELL_VAR * |
1505 | var_lookup (name, vcontext) | |
1506 | const char *name; | |
1507 | VAR_CONTEXT *vcontext; | |
1508 | { | |
1509 | VAR_CONTEXT *vc; | |
1510 | SHELL_VAR *v; | |
1511 | ||
1512 | v = (SHELL_VAR *)NULL; | |
1513 | for (vc = vcontext; vc; vc = vc->down) | |
1514 | if (v = hash_lookup (name, vc->table)) | |
1515 | break; | |
1516 | ||
1517 | return v; | |
1518 | } | |
1519 | ||
726f6388 | 1520 | /* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero, |
7117c2d2 JA |
1521 | then also search the temporarily built list of exported variables. |
1522 | The lookup order is: | |
1523 | temporary_env | |
1524 | shell_variables list | |
1525 | */ | |
1526 | ||
726f6388 | 1527 | SHELL_VAR * |
b80f6443 | 1528 | find_variable_internal (name, force_tempenv) |
f73dda09 | 1529 | const char *name; |
b80f6443 | 1530 | int force_tempenv; |
726f6388 | 1531 | { |
28ef6c31 | 1532 | SHELL_VAR *var; |
b80f6443 | 1533 | int search_tempenv; |
28ef6c31 JA |
1534 | |
1535 | var = (SHELL_VAR *)NULL; | |
726f6388 JA |
1536 | |
1537 | /* If explicitly requested, first look in the temporary environment for | |
1538 | the variable. This allows constructs such as "foo=x eval 'echo $foo'" | |
1539 | to get the `exported' value of $foo. This happens if we are executing | |
1540 | a function or builtin, or if we are looking up a variable in a | |
1541 | "subshell environment". */ | |
b80f6443 JA |
1542 | search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment); |
1543 | ||
1544 | if (search_tempenv && temporary_env) | |
7117c2d2 | 1545 | var = hash_lookup (name, temporary_env); |
726f6388 | 1546 | |
7117c2d2 | 1547 | if (var == 0) |
726f6388 JA |
1548 | var = var_lookup (name, shell_variables); |
1549 | ||
7117c2d2 | 1550 | if (var == 0) |
726f6388 JA |
1551 | return ((SHELL_VAR *)NULL); |
1552 | ||
ccc6cda3 | 1553 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); |
726f6388 JA |
1554 | } |
1555 | ||
1556 | /* Look up the variable entry named NAME. Returns the entry or NULL. */ | |
1557 | SHELL_VAR * | |
1558 | find_variable (name) | |
f73dda09 | 1559 | const char *name; |
726f6388 | 1560 | { |
b80f6443 | 1561 | return (find_variable_internal (name, (expanding_redir == 0 && this_shell_builtin != 0))); |
726f6388 JA |
1562 | } |
1563 | ||
1564 | /* Look up the function entry whose name matches STRING. | |
1565 | Returns the entry or NULL. */ | |
1566 | SHELL_VAR * | |
1567 | find_function (name) | |
f73dda09 | 1568 | const char *name; |
726f6388 | 1569 | { |
7117c2d2 JA |
1570 | return (hash_lookup (name, shell_functions)); |
1571 | } | |
1572 | ||
b80f6443 JA |
1573 | /* Find the function definition for the shell function named NAME. Returns |
1574 | the entry or NULL. */ | |
1575 | FUNCTION_DEF * | |
1576 | find_function_def (name) | |
1577 | const char *name; | |
1578 | { | |
1579 | return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs)); | |
1580 | } | |
1581 | ||
7117c2d2 JA |
1582 | /* Return the value of VAR. VAR is assumed to have been the result of a |
1583 | lookup without any subscript, if arrays are compiled into the shell. */ | |
1584 | char * | |
1585 | get_variable_value (var) | |
1586 | SHELL_VAR *var; | |
1587 | { | |
1588 | if (var == 0) | |
1589 | return ((char *)NULL); | |
1590 | #if defined (ARRAY_VARS) | |
1591 | else if (array_p (var)) | |
1592 | return (array_reference (array_cell (var), 0)); | |
1593 | #endif | |
1594 | else | |
1595 | return (value_cell (var)); | |
726f6388 JA |
1596 | } |
1597 | ||
1598 | /* Return the string value of a variable. Return NULL if the variable | |
7117c2d2 JA |
1599 | doesn't exist. Don't cons a new string. This is a potential memory |
1600 | leak if the variable is found in the temporary environment. Since | |
1601 | functions and variables have separate name spaces, returns NULL if | |
1602 | var_name is a shell function only. */ | |
726f6388 JA |
1603 | char * |
1604 | get_string_value (var_name) | |
28ef6c31 | 1605 | const char *var_name; |
726f6388 | 1606 | { |
d166f048 JA |
1607 | SHELL_VAR *var; |
1608 | ||
f73dda09 | 1609 | var = find_variable (var_name); |
7117c2d2 | 1610 | return ((var) ? get_variable_value (var) : (char *)NULL); |
726f6388 JA |
1611 | } |
1612 | ||
b72432fd JA |
1613 | /* This is present for use by the tilde and readline libraries. */ |
1614 | char * | |
28ef6c31 JA |
1615 | sh_get_env_value (v) |
1616 | const char *v; | |
b72432fd JA |
1617 | { |
1618 | return get_string_value (v); | |
1619 | } | |
1620 | ||
7117c2d2 JA |
1621 | /* **************************************************************** */ |
1622 | /* */ | |
1623 | /* Creating and setting variables */ | |
1624 | /* */ | |
1625 | /* **************************************************************** */ | |
1626 | ||
1627 | /* Set NAME to VALUE if NAME has no value. */ | |
1628 | SHELL_VAR * | |
1629 | set_if_not (name, value) | |
1630 | char *name, *value; | |
1631 | { | |
1632 | SHELL_VAR *v; | |
1633 | ||
1634 | v = find_variable (name); | |
1635 | if (v == 0) | |
95732b49 | 1636 | v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0); |
7117c2d2 JA |
1637 | return (v); |
1638 | } | |
1639 | ||
726f6388 JA |
1640 | /* Create a local variable referenced by NAME. */ |
1641 | SHELL_VAR * | |
1642 | make_local_variable (name) | |
f73dda09 | 1643 | const char *name; |
726f6388 JA |
1644 | { |
1645 | SHELL_VAR *new_var, *old_var; | |
7117c2d2 JA |
1646 | VAR_CONTEXT *vc; |
1647 | int was_tmpvar; | |
1648 | char *tmp_value; | |
726f6388 JA |
1649 | |
1650 | /* local foo; local foo; is a no-op. */ | |
1651 | old_var = find_variable (name); | |
7117c2d2 | 1652 | if (old_var && local_p (old_var) && old_var->context == variable_context) |
eb873671 JA |
1653 | { |
1654 | VUNSETATTR (old_var, att_invisible); | |
1655 | return (old_var); | |
1656 | } | |
726f6388 | 1657 | |
7117c2d2 JA |
1658 | was_tmpvar = old_var && tempvar_p (old_var); |
1659 | if (was_tmpvar) | |
1660 | tmp_value = value_cell (old_var); | |
1661 | ||
1662 | for (vc = shell_variables; vc; vc = vc->down) | |
1663 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
1664 | break; | |
1665 | ||
1666 | if (vc == 0) | |
1667 | { | |
b80f6443 | 1668 | internal_error (_("make_local_variable: no function context at current scope")); |
7117c2d2 JA |
1669 | return ((SHELL_VAR *)NULL); |
1670 | } | |
1671 | else if (vc->table == 0) | |
1672 | vc->table = hash_create (TEMPENV_HASH_BUCKETS); | |
1673 | ||
bb70624e JA |
1674 | /* Since this is called only from the local/declare/typeset code, we can |
1675 | call builtin_error here without worry (of course, it will also work | |
28ef6c31 JA |
1676 | for anything that sets this_command_name). Variables with the `noassign' |
1677 | attribute may not be made local. The test against old_var's context | |
1678 | level is to disallow local copies of readonly global variables (since I | |
1679 | believe that this could be a security hole). Readonly copies of calling | |
1680 | function local variables are OK. */ | |
1681 | if (old_var && (noassign_p (old_var) || | |
1682 | (readonly_p (old_var) && old_var->context == 0))) | |
1683 | { | |
1684 | if (readonly_p (old_var)) | |
7117c2d2 | 1685 | sh_readonly (name); |
bb70624e JA |
1686 | return ((SHELL_VAR *)NULL); |
1687 | } | |
1688 | ||
d166f048 | 1689 | if (old_var == 0) |
95732b49 | 1690 | new_var = bind_variable_internal (name, "", vc->table, HASH_NOSRCH, 0); |
726f6388 JA |
1691 | else |
1692 | { | |
7117c2d2 | 1693 | new_var = make_new_variable (name, vc->table); |
726f6388 | 1694 | |
7117c2d2 JA |
1695 | /* If we found this variable in one of the temporary environments, |
1696 | inherit its value. Watch to see if this causes problems with | |
1697 | things like `x=4 local x'. */ | |
1698 | if (was_tmpvar) | |
1699 | var_setvalue (new_var, savestring (tmp_value)); | |
726f6388 | 1700 | |
ccc6cda3 | 1701 | new_var->attributes = exported_p (old_var) ? att_exported : 0; |
726f6388 JA |
1702 | } |
1703 | ||
7117c2d2 JA |
1704 | vc->flags |= VC_HASLOCAL; |
1705 | ||
726f6388 | 1706 | new_var->context = variable_context; |
bb70624e | 1707 | VSETATTR (new_var, att_local); |
726f6388 | 1708 | |
7117c2d2 JA |
1709 | if (ifsname (name)) |
1710 | setifs (new_var); | |
726f6388 JA |
1711 | |
1712 | return (new_var); | |
1713 | } | |
1714 | ||
ccc6cda3 | 1715 | #if defined (ARRAY_VARS) |
726f6388 | 1716 | SHELL_VAR * |
ccc6cda3 JA |
1717 | make_local_array_variable (name) |
1718 | char *name; | |
1719 | { | |
1720 | SHELL_VAR *var; | |
1721 | ARRAY *array; | |
1722 | ||
1723 | var = make_local_variable (name); | |
b80f6443 | 1724 | if (var == 0 || array_p (var)) |
bb70624e | 1725 | return var; |
b80f6443 | 1726 | |
7117c2d2 | 1727 | array = array_create (); |
ccc6cda3 JA |
1728 | |
1729 | FREE (value_cell(var)); | |
7117c2d2 | 1730 | var_setarray (var, array); |
bb70624e | 1731 | VSETATTR (var, att_array); |
ccc6cda3 JA |
1732 | return var; |
1733 | } | |
1734 | #endif /* ARRAY_VARS */ | |
1735 | ||
7117c2d2 | 1736 | /* Create a new shell variable with name NAME. */ |
f73dda09 | 1737 | static SHELL_VAR * |
7117c2d2 | 1738 | new_shell_variable (name) |
f73dda09 | 1739 | const char *name; |
726f6388 | 1740 | { |
ccc6cda3 | 1741 | SHELL_VAR *entry; |
726f6388 | 1742 | |
ccc6cda3 | 1743 | entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); |
726f6388 | 1744 | |
ccc6cda3 | 1745 | entry->name = savestring (name); |
7117c2d2 | 1746 | var_setvalue (entry, (char *)NULL); |
bb70624e | 1747 | CLEAR_EXPORTSTR (entry); |
726f6388 | 1748 | |
7117c2d2 JA |
1749 | entry->dynamic_value = (sh_var_value_func_t *)NULL; |
1750 | entry->assign_func = (sh_var_assign_func_t *)NULL; | |
1751 | ||
1752 | entry->attributes = 0; | |
ccc6cda3 JA |
1753 | |
1754 | /* Always assume variables are to be made at toplevel! | |
1755 | make_local_variable has the responsibilty of changing the | |
1756 | variable context. */ | |
1757 | entry->context = 0; | |
7117c2d2 JA |
1758 | |
1759 | return (entry); | |
1760 | } | |
1761 | ||
1762 | /* Create a new shell variable with name NAME and add it to the hash table | |
1763 | TABLE. */ | |
1764 | static SHELL_VAR * | |
1765 | make_new_variable (name, table) | |
1766 | const char *name; | |
1767 | HASH_TABLE *table; | |
1768 | { | |
1769 | SHELL_VAR *entry; | |
1770 | BUCKET_CONTENTS *elt; | |
1771 | ||
1772 | entry = new_shell_variable (name); | |
ccc6cda3 | 1773 | |
28ef6c31 JA |
1774 | /* Make sure we have a shell_variables hash table to add to. */ |
1775 | if (shell_variables == 0) | |
7117c2d2 JA |
1776 | { |
1777 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
1778 | shell_variables->scope = 0; | |
1779 | shell_variables->table = hash_create (0); | |
1780 | } | |
28ef6c31 | 1781 | |
7117c2d2 JA |
1782 | elt = hash_insert (savestring (name), table, HASH_NOSRCH); |
1783 | elt->data = (PTR_T)entry; | |
ccc6cda3 JA |
1784 | |
1785 | return entry; | |
1786 | } | |
1787 | ||
1788 | #if defined (ARRAY_VARS) | |
1789 | SHELL_VAR * | |
1790 | make_new_array_variable (name) | |
1791 | char *name; | |
1792 | { | |
1793 | SHELL_VAR *entry; | |
1794 | ARRAY *array; | |
1795 | ||
7117c2d2 JA |
1796 | entry = make_new_variable (name, global_variables->table); |
1797 | array = array_create (); | |
1798 | var_setarray (entry, array); | |
bb70624e | 1799 | VSETATTR (entry, att_array); |
ccc6cda3 JA |
1800 | return entry; |
1801 | } | |
1802 | #endif | |
1803 | ||
1804 | char * | |
95732b49 | 1805 | make_variable_value (var, value, flags) |
ccc6cda3 JA |
1806 | SHELL_VAR *var; |
1807 | char *value; | |
95732b49 | 1808 | int flags; |
ccc6cda3 | 1809 | { |
95732b49 JA |
1810 | char *retval, *oval; |
1811 | intmax_t lval, rval; | |
1812 | int expok, olen; | |
ccc6cda3 JA |
1813 | |
1814 | /* If this variable has had its type set to integer (via `declare -i'), | |
1815 | then do expression evaluation on it and store the result. The | |
7117c2d2 | 1816 | functions in expr.c (evalexp()) and bind_int_variable() are responsible |
ccc6cda3 JA |
1817 | for turning off the integer flag if they don't want further |
1818 | evaluation done. */ | |
1819 | if (integer_p (var)) | |
1820 | { | |
95732b49 JA |
1821 | if (flags & ASS_APPEND) |
1822 | { | |
1823 | oval = value_cell (var); | |
1824 | lval = evalexp (oval, &expok); /* ksh93 seems to do this */ | |
1825 | if (expok == 0) | |
1826 | jump_to_top_level (DISCARD); | |
1827 | } | |
1828 | rval = evalexp (value, &expok); | |
d166f048 JA |
1829 | if (expok == 0) |
1830 | jump_to_top_level (DISCARD); | |
95732b49 JA |
1831 | if (flags & ASS_APPEND) |
1832 | rval += lval; | |
1833 | retval = itos (rval); | |
ccc6cda3 JA |
1834 | } |
1835 | else if (value) | |
1836 | { | |
95732b49 JA |
1837 | if (flags & ASS_APPEND) |
1838 | { | |
1839 | oval = get_variable_value (var); | |
1840 | if (oval == 0) /* paranoia */ | |
1841 | oval = ""; | |
1842 | olen = STRLEN (oval); | |
1843 | retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1); | |
1844 | strcpy (retval, oval); | |
1845 | if (value) | |
1846 | strcpy (retval+olen, value); | |
1847 | } | |
1848 | else if (*value) | |
ccc6cda3 JA |
1849 | retval = savestring (value); |
1850 | else | |
726f6388 | 1851 | { |
f73dda09 | 1852 | retval = (char *)xmalloc (1); |
ccc6cda3 | 1853 | retval[0] = '\0'; |
726f6388 | 1854 | } |
ccc6cda3 JA |
1855 | } |
1856 | else | |
1857 | retval = (char *)NULL; | |
726f6388 | 1858 | |
ccc6cda3 JA |
1859 | return retval; |
1860 | } | |
726f6388 | 1861 | |
7117c2d2 JA |
1862 | /* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the |
1863 | temporary environment (but usually is not). */ | |
1864 | static SHELL_VAR * | |
95732b49 | 1865 | bind_variable_internal (name, value, table, hflags, aflags) |
f73dda09 JA |
1866 | const char *name; |
1867 | char *value; | |
7117c2d2 | 1868 | HASH_TABLE *table; |
95732b49 | 1869 | int hflags, aflags; |
ccc6cda3 JA |
1870 | { |
1871 | char *newval; | |
7117c2d2 | 1872 | SHELL_VAR *entry; |
28ef6c31 | 1873 | |
7117c2d2 | 1874 | entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table); |
ccc6cda3 JA |
1875 | |
1876 | if (entry == 0) | |
1877 | { | |
7117c2d2 | 1878 | entry = make_new_variable (name, table); |
95732b49 | 1879 | var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */ |
726f6388 | 1880 | } |
28ef6c31 | 1881 | else if (entry->assign_func) /* array vars have assign functions now */ |
bb70624e JA |
1882 | { |
1883 | INVALIDATE_EXPORTSTR (entry); | |
95732b49 JA |
1884 | newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value; |
1885 | entry = (*(entry->assign_func)) (entry, newval, -1); | |
1886 | if (newval != value) | |
1887 | free (newval); | |
1888 | return (entry); | |
bb70624e | 1889 | } |
726f6388 JA |
1890 | else |
1891 | { | |
28ef6c31 | 1892 | if (readonly_p (entry) || noassign_p (entry)) |
726f6388 | 1893 | { |
28ef6c31 | 1894 | if (readonly_p (entry)) |
7117c2d2 | 1895 | err_readonly (name); |
726f6388 JA |
1896 | return (entry); |
1897 | } | |
1898 | ||
1899 | /* Variables which are bound are visible. */ | |
bb70624e | 1900 | VUNSETATTR (entry, att_invisible); |
726f6388 | 1901 | |
95732b49 | 1902 | newval = make_variable_value (entry, value, aflags); /* XXX */ |
726f6388 | 1903 | |
bb70624e JA |
1904 | /* Invalidate any cached export string */ |
1905 | INVALIDATE_EXPORTSTR (entry); | |
1906 | ||
ccc6cda3 JA |
1907 | #if defined (ARRAY_VARS) |
1908 | /* XXX -- this bears looking at again -- XXX */ | |
1909 | /* If an existing array variable x is being assigned to with x=b or | |
1910 | `read x' or something of that nature, silently convert it to | |
1911 | x[0]=b or `read x[0]'. */ | |
1912 | if (array_p (entry)) | |
d166f048 | 1913 | { |
7117c2d2 | 1914 | array_insert (array_cell (entry), 0, newval); |
d166f048 JA |
1915 | free (newval); |
1916 | } | |
726f6388 | 1917 | else |
f73dda09 | 1918 | #endif |
726f6388 | 1919 | { |
7117c2d2 JA |
1920 | FREE (value_cell (entry)); |
1921 | var_setvalue (entry, newval); | |
726f6388 JA |
1922 | } |
1923 | } | |
1924 | ||
1925 | if (mark_modified_vars) | |
bb70624e | 1926 | VSETATTR (entry, att_exported); |
726f6388 JA |
1927 | |
1928 | if (exported_p (entry)) | |
1929 | array_needs_making = 1; | |
1930 | ||
1931 | return (entry); | |
1932 | } | |
7117c2d2 JA |
1933 | |
1934 | /* Bind a variable NAME to VALUE. This conses up the name | |
1935 | and value strings. If we have a temporary environment, we bind there | |
1936 | first, then we bind into shell_variables. */ | |
1937 | ||
1938 | SHELL_VAR * | |
95732b49 | 1939 | bind_variable (name, value, flags) |
7117c2d2 JA |
1940 | const char *name; |
1941 | char *value; | |
95732b49 | 1942 | int flags; |
7117c2d2 JA |
1943 | { |
1944 | SHELL_VAR *v; | |
1945 | VAR_CONTEXT *vc; | |
1946 | ||
1947 | if (shell_variables == 0) | |
1948 | { | |
1949 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
1950 | shell_variables->scope = 0; | |
1951 | shell_variables->table = hash_create (0); | |
1952 | } | |
1953 | ||
1954 | /* If we have a temporary environment, look there first for the variable, | |
1955 | and, if found, modify the value there before modifying it in the | |
1956 | shell_variables table. This allows sourced scripts to modify values | |
1957 | given to them in a temporary environment while modifying the variable | |
1958 | value that the caller sees. */ | |
1959 | if (temporary_env) | |
1960 | bind_tempenv_variable (name, value); | |
1961 | ||
1962 | /* XXX -- handle local variables here. */ | |
1963 | for (vc = shell_variables; vc; vc = vc->down) | |
1964 | { | |
1965 | if (vc_isfuncenv (vc) || vc_isbltnenv (vc)) | |
1966 | { | |
1967 | v = hash_lookup (name, vc->table); | |
1968 | if (v) | |
95732b49 | 1969 | return (bind_variable_internal (name, value, vc->table, 0, flags)); |
7117c2d2 JA |
1970 | } |
1971 | } | |
95732b49 | 1972 | return (bind_variable_internal (name, value, global_variables->table, 0, flags)); |
7117c2d2 | 1973 | } |
726f6388 | 1974 | |
bb70624e JA |
1975 | /* Make VAR, a simple shell variable, have value VALUE. Once assigned a |
1976 | value, variables are no longer invisible. This is a duplicate of part | |
1977 | of the internals of bind_variable. If the variable is exported, or | |
1978 | all modified variables should be exported, mark the variable for export | |
1979 | and note that the export environment needs to be recreated. */ | |
1980 | SHELL_VAR * | |
95732b49 | 1981 | bind_variable_value (var, value, aflags) |
bb70624e JA |
1982 | SHELL_VAR *var; |
1983 | char *value; | |
95732b49 | 1984 | int aflags; |
bb70624e JA |
1985 | { |
1986 | char *t; | |
1987 | ||
1988 | VUNSETATTR (var, att_invisible); | |
1989 | ||
95732b49 JA |
1990 | if (var->assign_func) |
1991 | { | |
1992 | /* If we're appending, we need the old value, so use | |
1993 | make_variable_value */ | |
1994 | t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value; | |
1995 | (*(var->assign_func)) (var, t, -1); | |
1996 | if (t != value && t) | |
1997 | free (t); | |
1998 | } | |
1999 | else | |
2000 | { | |
2001 | t = make_variable_value (var, value, aflags); | |
2002 | FREE (value_cell (var)); | |
2003 | var_setvalue (var, t); | |
2004 | } | |
bb70624e JA |
2005 | |
2006 | INVALIDATE_EXPORTSTR (var); | |
2007 | ||
2008 | if (mark_modified_vars) | |
2009 | VSETATTR (var, att_exported); | |
2010 | ||
2011 | if (exported_p (var)) | |
2012 | array_needs_making = 1; | |
2013 | ||
2014 | return (var); | |
2015 | } | |
2016 | ||
2017 | /* Bind/create a shell variable with the name LHS to the RHS. | |
2018 | This creates or modifies a variable such that it is an integer. | |
2019 | ||
2020 | This used to be in expr.c, but it is here so that all of the | |
2021 | variable binding stuff is localized. Since we don't want any | |
2022 | recursive evaluation from bind_variable() (possible without this code, | |
2023 | since bind_variable() calls the evaluator for variables with the integer | |
2024 | attribute set), we temporarily turn off the integer attribute for each | |
2025 | variable we set here, then turn it back on after binding as necessary. */ | |
2026 | ||
2027 | SHELL_VAR * | |
2028 | bind_int_variable (lhs, rhs) | |
2029 | char *lhs, *rhs; | |
2030 | { | |
2031 | register SHELL_VAR *v; | |
7117c2d2 JA |
2032 | char *t; |
2033 | int isint, isarr; | |
2034 | ||
2035 | isint = isarr = 0; | |
2036 | #if defined (ARRAY_VARS) | |
b80f6443 | 2037 | # if 0 |
7117c2d2 | 2038 | if (t = xstrchr (lhs, '[')) /*]*/ |
b80f6443 JA |
2039 | # else |
2040 | if (valid_array_reference (lhs)) | |
2041 | # endif | |
7117c2d2 JA |
2042 | { |
2043 | isarr = 1; | |
2044 | v = array_variable_part (lhs, (char **)0, (int *)0); | |
2045 | } | |
2046 | else | |
2047 | #endif | |
2048 | v = find_variable (lhs); | |
bb70624e | 2049 | |
bb70624e JA |
2050 | if (v) |
2051 | { | |
2052 | isint = integer_p (v); | |
2053 | VUNSETATTR (v, att_integer); | |
2054 | } | |
2055 | ||
7117c2d2 JA |
2056 | #if defined (ARRAY_VARS) |
2057 | if (isarr) | |
95732b49 | 2058 | v = assign_array_element (lhs, rhs, 0); |
7117c2d2 JA |
2059 | else |
2060 | #endif | |
95732b49 | 2061 | v = bind_variable (lhs, rhs, 0); |
7117c2d2 | 2062 | |
bb70624e JA |
2063 | if (isint) |
2064 | VSETATTR (v, att_integer); | |
2065 | ||
2066 | return (v); | |
2067 | } | |
2068 | ||
ccc6cda3 | 2069 | SHELL_VAR * |
f73dda09 JA |
2070 | bind_var_to_int (var, val) |
2071 | char *var; | |
7117c2d2 | 2072 | intmax_t val; |
ccc6cda3 | 2073 | { |
7117c2d2 | 2074 | char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p; |
ccc6cda3 | 2075 | |
f73dda09 JA |
2076 | p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0); |
2077 | return (bind_int_variable (var, p)); | |
ccc6cda3 JA |
2078 | } |
2079 | ||
7117c2d2 JA |
2080 | /* Do a function binding to a variable. You pass the name and |
2081 | the command to bind to. This conses the name and command. */ | |
2082 | SHELL_VAR * | |
2083 | bind_function (name, value) | |
2084 | const char *name; | |
2085 | COMMAND *value; | |
2086 | { | |
2087 | SHELL_VAR *entry; | |
2088 | ||
2089 | entry = find_function (name); | |
2090 | if (entry == 0) | |
2091 | { | |
2092 | BUCKET_CONTENTS *elt; | |
2093 | ||
2094 | elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH); | |
2095 | entry = new_shell_variable (name); | |
2096 | elt->data = (PTR_T)entry; | |
2097 | } | |
2098 | else | |
2099 | INVALIDATE_EXPORTSTR (entry); | |
2100 | ||
2101 | if (var_isset (entry)) | |
2102 | dispose_command (function_cell (entry)); | |
2103 | ||
2104 | if (value) | |
2105 | var_setfunc (entry, copy_command (value)); | |
2106 | else | |
2107 | var_setfunc (entry, 0); | |
2108 | ||
2109 | VSETATTR (entry, att_function); | |
2110 | ||
2111 | if (mark_modified_vars) | |
2112 | VSETATTR (entry, att_exported); | |
2113 | ||
2114 | VUNSETATTR (entry, att_invisible); /* Just to be sure */ | |
2115 | ||
2116 | if (exported_p (entry)) | |
2117 | array_needs_making = 1; | |
2118 | ||
2119 | #if defined (PROGRAMMABLE_COMPLETION) | |
2120 | set_itemlist_dirty (&it_functions); | |
2121 | #endif | |
2122 | ||
2123 | return (entry); | |
2124 | } | |
2125 | ||
b80f6443 JA |
2126 | /* Bind a function definition, which includes source file and line number |
2127 | information in addition to the command, into the FUNCTION_DEF hash table.*/ | |
2128 | void | |
2129 | bind_function_def (name, value) | |
2130 | const char *name; | |
2131 | FUNCTION_DEF *value; | |
2132 | { | |
2133 | FUNCTION_DEF *entry; | |
2134 | BUCKET_CONTENTS *elt; | |
2135 | COMMAND *cmd; | |
2136 | ||
2137 | entry = find_function_def (name); | |
2138 | if (entry) | |
2139 | { | |
2140 | dispose_function_def_contents (entry); | |
2141 | entry = copy_function_def_contents (value, entry); | |
2142 | } | |
2143 | else | |
2144 | { | |
2145 | cmd = value->command; | |
2146 | value->command = 0; | |
2147 | entry = copy_function_def (value); | |
2148 | value->command = cmd; | |
2149 | ||
2150 | elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH); | |
2151 | elt->data = (PTR_T *)entry; | |
2152 | } | |
2153 | } | |
2154 | ||
7117c2d2 JA |
2155 | /* Add STRING, which is of the form foo=bar, to the temporary environment |
2156 | HASH_TABLE (temporary_env). The functions in execute_cmd.c are | |
2157 | responsible for moving the main temporary env to one of the other | |
2158 | temporary environments. The expansion code in subst.c calls this. */ | |
2159 | int | |
95732b49 JA |
2160 | assign_in_env (word) |
2161 | WORD_DESC *word; | |
7117c2d2 JA |
2162 | { |
2163 | int offset; | |
2164 | char *name, *temp, *value; | |
2165 | SHELL_VAR *var; | |
95732b49 JA |
2166 | const char *string; |
2167 | ||
2168 | string = word->word; | |
7117c2d2 | 2169 | |
b80f6443 | 2170 | offset = assignment (string, 0); |
7117c2d2 JA |
2171 | name = savestring (string); |
2172 | value = (char *)NULL; | |
2173 | ||
2174 | if (name[offset] == '=') | |
2175 | { | |
2176 | name[offset] = 0; | |
2177 | ||
95732b49 JA |
2178 | /* ignore the `+' when assigning temporary environment */ |
2179 | if (name[offset - 1] == '+') | |
2180 | name[offset - 1] = '\0'; | |
2181 | ||
7117c2d2 JA |
2182 | var = find_variable (name); |
2183 | if (var && (readonly_p (var) || noassign_p (var))) | |
2184 | { | |
2185 | if (readonly_p (var)) | |
2186 | err_readonly (name); | |
2187 | free (name); | |
2188 | return (0); | |
2189 | } | |
2190 | ||
2191 | temp = name + offset + 1; | |
95732b49 | 2192 | #if 0 |
7117c2d2 | 2193 | temp = (xstrchr (temp, '~') != 0) ? bash_tilde_expand (temp, 1) : savestring (temp); |
7117c2d2 JA |
2194 | value = expand_string_unsplit_to_string (temp, 0); |
2195 | free (temp); | |
95732b49 JA |
2196 | #else |
2197 | value = expand_assignment_string_to_string (temp, 0); | |
2198 | #endif | |
7117c2d2 JA |
2199 | } |
2200 | ||
2201 | if (temporary_env == 0) | |
2202 | temporary_env = hash_create (TEMPENV_HASH_BUCKETS); | |
2203 | ||
2204 | var = hash_lookup (name, temporary_env); | |
2205 | if (var == 0) | |
2206 | var = make_new_variable (name, temporary_env); | |
2207 | else | |
2208 | FREE (value_cell (var)); | |
2209 | ||
2210 | if (value == 0) | |
2211 | { | |
2212 | value = (char *)xmalloc (1); /* like do_assignment_internal */ | |
2213 | value[0] = '\0'; | |
2214 | } | |
2215 | ||
2216 | var_setvalue (var, value); | |
2217 | var->attributes |= (att_exported|att_tempvar); | |
2218 | var->context = variable_context; /* XXX */ | |
2219 | ||
2220 | INVALIDATE_EXPORTSTR (var); | |
2221 | var->exportstr = mk_env_string (name, value); | |
2222 | ||
2223 | array_needs_making = 1; | |
2224 | ||
2225 | if (ifsname (name)) | |
2226 | setifs (var); | |
2227 | ||
2228 | if (echo_command_at_execute) | |
b80f6443 JA |
2229 | /* The Korn shell prints the `+ ' in front of assignment statements, |
2230 | so we do too. */ | |
2231 | xtrace_print_assignment (name, value, 0, 1); | |
7117c2d2 | 2232 | |
b80f6443 | 2233 | free (name); |
7117c2d2 JA |
2234 | return 1; |
2235 | } | |
2236 | ||
2237 | /* **************************************************************** */ | |
2238 | /* */ | |
2239 | /* Copying variables */ | |
2240 | /* */ | |
2241 | /* **************************************************************** */ | |
2242 | ||
2243 | #ifdef INCLUDE_UNUSED | |
2244 | /* Copy VAR to a new data structure and return that structure. */ | |
2245 | SHELL_VAR * | |
2246 | copy_variable (var) | |
2247 | SHELL_VAR *var; | |
2248 | { | |
2249 | SHELL_VAR *copy = (SHELL_VAR *)NULL; | |
2250 | ||
2251 | if (var) | |
2252 | { | |
2253 | copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); | |
2254 | ||
2255 | copy->attributes = var->attributes; | |
2256 | copy->name = savestring (var->name); | |
2257 | ||
2258 | if (function_p (var)) | |
2259 | var_setfunc (copy, copy_command (function_cell (var))); | |
2260 | #if defined (ARRAY_VARS) | |
2261 | else if (array_p (var)) | |
2262 | var_setarray (copy, dup_array (array_cell (var))); | |
2263 | #endif | |
2264 | else if (value_cell (var)) | |
2265 | var_setvalue (copy, savestring (value_cell (var))); | |
2266 | else | |
2267 | var_setvalue (copy, (char *)NULL); | |
2268 | ||
2269 | copy->dynamic_value = var->dynamic_value; | |
2270 | copy->assign_func = var->assign_func; | |
2271 | ||
2272 | copy->exportstr = COPY_EXPORTSTR (var); | |
2273 | ||
2274 | copy->context = var->context; | |
2275 | } | |
2276 | return (copy); | |
2277 | } | |
2278 | #endif | |
2279 | ||
2280 | /* **************************************************************** */ | |
2281 | /* */ | |
2282 | /* Deleting and unsetting variables */ | |
2283 | /* */ | |
2284 | /* **************************************************************** */ | |
2285 | ||
726f6388 JA |
2286 | /* Dispose of the information attached to VAR. */ |
2287 | void | |
2288 | dispose_variable (var) | |
2289 | SHELL_VAR *var; | |
2290 | { | |
7117c2d2 | 2291 | if (var == 0) |
726f6388 JA |
2292 | return; |
2293 | ||
2294 | if (function_p (var)) | |
ccc6cda3 JA |
2295 | dispose_command (function_cell (var)); |
2296 | #if defined (ARRAY_VARS) | |
2297 | else if (array_p (var)) | |
7117c2d2 | 2298 | array_dispose (array_cell (var)); |
ccc6cda3 JA |
2299 | #endif |
2300 | else | |
2301 | FREE (value_cell (var)); | |
726f6388 | 2302 | |
bb70624e JA |
2303 | FREE_EXPORTSTR (var); |
2304 | ||
726f6388 JA |
2305 | free (var->name); |
2306 | ||
2307 | if (exported_p (var)) | |
2308 | array_needs_making = 1; | |
2309 | ||
2310 | free (var); | |
2311 | } | |
2312 | ||
7117c2d2 | 2313 | /* Unset the shell variable referenced by NAME. */ |
ccc6cda3 | 2314 | int |
726f6388 | 2315 | unbind_variable (name) |
f73dda09 | 2316 | const char *name; |
726f6388 | 2317 | { |
7117c2d2 JA |
2318 | return makunbound (name, shell_variables); |
2319 | } | |
726f6388 | 2320 | |
7117c2d2 JA |
2321 | /* Unset the shell function named NAME. */ |
2322 | int | |
2323 | unbind_func (name) | |
2324 | const char *name; | |
2325 | { | |
2326 | BUCKET_CONTENTS *elt; | |
2327 | SHELL_VAR *func; | |
726f6388 | 2328 | |
7117c2d2 JA |
2329 | elt = hash_remove (name, shell_functions, 0); |
2330 | ||
2331 | if (elt == 0) | |
2332 | return -1; | |
2333 | ||
2334 | #if defined (PROGRAMMABLE_COMPLETION) | |
2335 | set_itemlist_dirty (&it_functions); | |
ccc6cda3 | 2336 | #endif |
7117c2d2 JA |
2337 | |
2338 | func = (SHELL_VAR *)elt->data; | |
2339 | if (func) | |
726f6388 | 2340 | { |
7117c2d2 JA |
2341 | if (exported_p (func)) |
2342 | array_needs_making++; | |
2343 | dispose_variable (func); | |
726f6388 JA |
2344 | } |
2345 | ||
7117c2d2 JA |
2346 | free (elt->key); |
2347 | free (elt); | |
726f6388 | 2348 | |
7117c2d2 | 2349 | return 0; |
726f6388 JA |
2350 | } |
2351 | ||
b80f6443 JA |
2352 | int |
2353 | unbind_function_def (name) | |
2354 | const char *name; | |
2355 | { | |
2356 | BUCKET_CONTENTS *elt; | |
2357 | FUNCTION_DEF *funcdef; | |
2358 | ||
2359 | elt = hash_remove (name, shell_function_defs, 0); | |
2360 | ||
2361 | if (elt == 0) | |
2362 | return -1; | |
2363 | ||
2364 | funcdef = (FUNCTION_DEF *)elt->data; | |
2365 | if (funcdef) | |
2366 | dispose_function_def (funcdef); | |
2367 | ||
2368 | free (elt->key); | |
2369 | free (elt); | |
2370 | ||
2371 | return 0; | |
2372 | } | |
2373 | ||
726f6388 JA |
2374 | /* Make the variable associated with NAME go away. HASH_LIST is the |
2375 | hash table from which this variable should be deleted (either | |
2376 | shell_variables or shell_functions). | |
2377 | Returns non-zero if the variable couldn't be found. */ | |
ccc6cda3 | 2378 | int |
7117c2d2 | 2379 | makunbound (name, vc) |
f73dda09 | 2380 | const char *name; |
7117c2d2 | 2381 | VAR_CONTEXT *vc; |
726f6388 | 2382 | { |
d166f048 | 2383 | BUCKET_CONTENTS *elt, *new_elt; |
7117c2d2 JA |
2384 | SHELL_VAR *old_var; |
2385 | VAR_CONTEXT *v; | |
726f6388 JA |
2386 | char *t; |
2387 | ||
7117c2d2 JA |
2388 | for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down) |
2389 | if (elt = hash_remove (name, v->table, 0)) | |
2390 | break; | |
726f6388 | 2391 | |
d166f048 | 2392 | if (elt == 0) |
726f6388 JA |
2393 | return (-1); |
2394 | ||
2395 | old_var = (SHELL_VAR *)elt->data; | |
726f6388 JA |
2396 | |
2397 | if (old_var && exported_p (old_var)) | |
2398 | array_needs_making++; | |
2399 | ||
ccc6cda3 | 2400 | /* If we're unsetting a local variable and we're still executing inside |
7117c2d2 JA |
2401 | the function, just mark the variable as invisible. The function |
2402 | eventually called by pop_var_context() will clean it up later. This | |
2403 | must be done so that if the variable is subsequently assigned a new | |
2404 | value inside the function, the `local' attribute is still present. | |
2405 | We also need to add it back into the correct hash table. */ | |
ccc6cda3 JA |
2406 | if (old_var && local_p (old_var) && variable_context == old_var->context) |
2407 | { | |
95732b49 JA |
2408 | #if defined (ARRAY_VARS) |
2409 | if (array_p (old_var)) | |
2410 | array_dispose (array_cell (old_var)); | |
2411 | else | |
2412 | #endif | |
2413 | FREE (value_cell (old_var)); | |
b80f6443 JA |
2414 | /* Reset the attributes. Preserve the export attribute if the variable |
2415 | came from a temporary environment. Make sure it stays local, and | |
2416 | make it invisible. */ | |
2417 | old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0; | |
2418 | VSETATTR (old_var, att_local); | |
bb70624e | 2419 | VSETATTR (old_var, att_invisible); |
7117c2d2 | 2420 | var_setvalue (old_var, (char *)NULL); |
bb70624e | 2421 | INVALIDATE_EXPORTSTR (old_var); |
7117c2d2 JA |
2422 | |
2423 | new_elt = hash_insert (savestring (old_var->name), v->table, 0); | |
2424 | new_elt->data = (PTR_T)old_var; | |
ccc6cda3 | 2425 | stupidly_hack_special_variables (old_var->name); |
7117c2d2 | 2426 | |
d166f048 JA |
2427 | free (elt->key); |
2428 | free (elt); | |
ccc6cda3 JA |
2429 | return (0); |
2430 | } | |
2431 | ||
726f6388 JA |
2432 | /* Have to save a copy of name here, because it might refer to |
2433 | old_var->name. If so, stupidly_hack_special_variables will | |
2434 | reference freed memory. */ | |
2435 | t = savestring (name); | |
2436 | ||
2437 | free (elt->key); | |
2438 | free (elt); | |
2439 | ||
2440 | dispose_variable (old_var); | |
2441 | stupidly_hack_special_variables (t); | |
2442 | free (t); | |
7117c2d2 | 2443 | |
726f6388 JA |
2444 | return (0); |
2445 | } | |
2446 | ||
7117c2d2 JA |
2447 | /* Get rid of all of the variables in the current context. */ |
2448 | void | |
2449 | kill_all_local_variables () | |
726f6388 | 2450 | { |
7117c2d2 JA |
2451 | VAR_CONTEXT *vc; |
2452 | ||
2453 | for (vc = shell_variables; vc; vc = vc->down) | |
2454 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
2455 | break; | |
2456 | if (vc == 0) | |
2457 | return; /* XXX */ | |
726f6388 | 2458 | |
7117c2d2 | 2459 | if (vc->table && vc_haslocals (vc)) |
726f6388 | 2460 | { |
7117c2d2 JA |
2461 | delete_all_variables (vc->table); |
2462 | hash_dispose (vc->table); | |
726f6388 | 2463 | } |
7117c2d2 | 2464 | vc->table = (HASH_TABLE *)NULL; |
726f6388 JA |
2465 | } |
2466 | ||
ccc6cda3 JA |
2467 | static void |
2468 | free_variable_hash_data (data) | |
f73dda09 | 2469 | PTR_T data; |
ccc6cda3 | 2470 | { |
7117c2d2 | 2471 | SHELL_VAR *var; |
ccc6cda3 JA |
2472 | |
2473 | var = (SHELL_VAR *)data; | |
7117c2d2 | 2474 | dispose_variable (var); |
ccc6cda3 JA |
2475 | } |
2476 | ||
726f6388 JA |
2477 | /* Delete the entire contents of the hash table. */ |
2478 | void | |
2479 | delete_all_variables (hashed_vars) | |
2480 | HASH_TABLE *hashed_vars; | |
2481 | { | |
7117c2d2 | 2482 | hash_flush (hashed_vars, free_variable_hash_data); |
726f6388 JA |
2483 | } |
2484 | ||
7117c2d2 JA |
2485 | /* **************************************************************** */ |
2486 | /* */ | |
2487 | /* Setting variable attributes */ | |
2488 | /* */ | |
2489 | /* **************************************************************** */ | |
726f6388 | 2490 | |
ccc6cda3 JA |
2491 | #define FIND_OR_MAKE_VARIABLE(name, entry) \ |
2492 | do \ | |
2493 | { \ | |
2494 | entry = find_variable (name); \ | |
2495 | if (!entry) \ | |
2496 | { \ | |
95732b49 | 2497 | entry = bind_variable (name, "", 0); \ |
ccc6cda3 JA |
2498 | if (!no_invisible_vars) entry->attributes |= att_invisible; \ |
2499 | } \ | |
2500 | } \ | |
2501 | while (0) | |
2502 | ||
2503 | /* Make the variable associated with NAME be readonly. | |
726f6388 JA |
2504 | If NAME does not exist yet, create it. */ |
2505 | void | |
2506 | set_var_read_only (name) | |
2507 | char *name; | |
2508 | { | |
ccc6cda3 | 2509 | SHELL_VAR *entry; |
726f6388 | 2510 | |
ccc6cda3 | 2511 | FIND_OR_MAKE_VARIABLE (name, entry); |
bb70624e | 2512 | VSETATTR (entry, att_readonly); |
726f6388 JA |
2513 | } |
2514 | ||
cce855bc | 2515 | #ifdef INCLUDE_UNUSED |
ccc6cda3 | 2516 | /* Make the function associated with NAME be readonly. |
726f6388 JA |
2517 | If NAME does not exist, we just punt, like auto_export code below. */ |
2518 | void | |
2519 | set_func_read_only (name) | |
f73dda09 | 2520 | const char *name; |
726f6388 | 2521 | { |
d166f048 | 2522 | SHELL_VAR *entry; |
726f6388 | 2523 | |
d166f048 | 2524 | entry = find_function (name); |
726f6388 | 2525 | if (entry) |
bb70624e | 2526 | VSETATTR (entry, att_readonly); |
726f6388 JA |
2527 | } |
2528 | ||
2529 | /* Make the variable associated with NAME be auto-exported. | |
2530 | If NAME does not exist yet, create it. */ | |
2531 | void | |
2532 | set_var_auto_export (name) | |
2533 | char *name; | |
2534 | { | |
ccc6cda3 | 2535 | SHELL_VAR *entry; |
726f6388 | 2536 | |
ccc6cda3 | 2537 | FIND_OR_MAKE_VARIABLE (name, entry); |
726f6388 JA |
2538 | set_auto_export (entry); |
2539 | } | |
2540 | ||
2541 | /* Make the function associated with NAME be auto-exported. */ | |
2542 | void | |
2543 | set_func_auto_export (name) | |
f73dda09 | 2544 | const char *name; |
726f6388 | 2545 | { |
ccc6cda3 | 2546 | SHELL_VAR *entry; |
726f6388 | 2547 | |
ccc6cda3 | 2548 | entry = find_function (name); |
726f6388 | 2549 | if (entry) |
ccc6cda3 JA |
2550 | set_auto_export (entry); |
2551 | } | |
cce855bc | 2552 | #endif |
ccc6cda3 | 2553 | |
7117c2d2 JA |
2554 | /* **************************************************************** */ |
2555 | /* */ | |
2556 | /* Creating lists of variables */ | |
2557 | /* */ | |
2558 | /* **************************************************************** */ | |
2559 | ||
2560 | static VARLIST * | |
2561 | vlist_alloc (nentries) | |
2562 | int nentries; | |
726f6388 | 2563 | { |
7117c2d2 | 2564 | VARLIST *vlist; |
726f6388 | 2565 | |
7117c2d2 JA |
2566 | vlist = (VARLIST *)xmalloc (sizeof (VARLIST)); |
2567 | vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *)); | |
2568 | vlist->list_size = nentries; | |
2569 | vlist->list_len = 0; | |
2570 | vlist->list[0] = (SHELL_VAR *)NULL; | |
726f6388 | 2571 | |
7117c2d2 JA |
2572 | return vlist; |
2573 | } | |
726f6388 | 2574 | |
7117c2d2 JA |
2575 | static VARLIST * |
2576 | vlist_realloc (vlist, n) | |
2577 | VARLIST *vlist; | |
2578 | int n; | |
2579 | { | |
2580 | if (vlist == 0) | |
2581 | return (vlist = vlist_alloc (n)); | |
2582 | if (n > vlist->list_size) | |
726f6388 | 2583 | { |
7117c2d2 JA |
2584 | vlist->list_size = n; |
2585 | vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *)); | |
2586 | } | |
2587 | return vlist; | |
2588 | } | |
726f6388 | 2589 | |
7117c2d2 JA |
2590 | static void |
2591 | vlist_add (vlist, var, flags) | |
2592 | VARLIST *vlist; | |
2593 | SHELL_VAR *var; | |
2594 | int flags; | |
2595 | { | |
2596 | register int i; | |
ccc6cda3 | 2597 | |
7117c2d2 JA |
2598 | for (i = 0; i < vlist->list_len; i++) |
2599 | if (STREQ (var->name, vlist->list[i]->name)) | |
2600 | break; | |
2601 | if (i < vlist->list_len) | |
2602 | return; | |
2603 | ||
2604 | if (i >= vlist->list_size) | |
2605 | vlist = vlist_realloc (vlist, vlist->list_size + 16); | |
726f6388 | 2606 | |
7117c2d2 JA |
2607 | vlist->list[vlist->list_len++] = var; |
2608 | vlist->list[vlist->list_len] = (SHELL_VAR *)NULL; | |
2609 | } | |
2610 | ||
2611 | /* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the | |
2612 | variables for which FUNCTION returns a non-zero value. A NULL value | |
2613 | for FUNCTION means to use all variables. */ | |
2614 | SHELL_VAR ** | |
2615 | map_over (function, vc) | |
2616 | sh_var_map_func_t *function; | |
2617 | VAR_CONTEXT *vc; | |
2618 | { | |
2619 | VAR_CONTEXT *v; | |
2620 | VARLIST *vlist; | |
2621 | SHELL_VAR **ret; | |
2622 | int nentries; | |
2623 | ||
2624 | for (nentries = 0, v = vc; v; v = v->down) | |
2625 | nentries += HASH_ENTRIES (v->table); | |
2626 | ||
2627 | if (nentries == 0) | |
2628 | return (SHELL_VAR **)NULL; | |
2629 | ||
2630 | vlist = vlist_alloc (nentries); | |
2631 | ||
2632 | for (v = vc; v; v = v->down) | |
2633 | flatten (v->table, function, vlist, 0); | |
2634 | ||
2635 | ret = vlist->list; | |
2636 | free (vlist); | |
2637 | return ret; | |
2638 | } | |
2639 | ||
2640 | SHELL_VAR ** | |
2641 | map_over_funcs (function) | |
2642 | sh_var_map_func_t *function; | |
2643 | { | |
2644 | VARLIST *vlist; | |
2645 | SHELL_VAR **ret; | |
2646 | ||
2647 | if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0) | |
2648 | return ((SHELL_VAR **)NULL); | |
2649 | ||
2650 | vlist = vlist_alloc (HASH_ENTRIES (shell_functions)); | |
2651 | ||
2652 | flatten (shell_functions, function, vlist, 0); | |
2653 | ||
2654 | ret = vlist->list; | |
2655 | free (vlist); | |
2656 | return ret; | |
2657 | } | |
2658 | ||
2659 | /* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those | |
2660 | elements for which FUNC succeeds to VLIST->list. FLAGS is reserved | |
2661 | for future use. Only unique names are added to VLIST. If FUNC is | |
2662 | NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is | |
2663 | NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST | |
2664 | and FUNC are both NULL, nothing happens. */ | |
2665 | static void | |
2666 | flatten (var_hash_table, func, vlist, flags) | |
2667 | HASH_TABLE *var_hash_table; | |
2668 | sh_var_map_func_t *func; | |
2669 | VARLIST *vlist; | |
2670 | int flags; | |
2671 | { | |
2672 | register int i; | |
2673 | register BUCKET_CONTENTS *tlist; | |
2674 | int r; | |
2675 | SHELL_VAR *var; | |
2676 | ||
2677 | if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0)) | |
2678 | return; | |
2679 | ||
2680 | for (i = 0; i < var_hash_table->nbuckets; i++) | |
2681 | { | |
2682 | for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next) | |
2683 | { | |
2684 | var = (SHELL_VAR *)tlist->data; | |
2685 | ||
2686 | r = func ? (*func) (var) : 1; | |
2687 | if (r && vlist) | |
2688 | vlist_add (vlist, var, flags); | |
2689 | } | |
726f6388 | 2690 | } |
7117c2d2 JA |
2691 | } |
2692 | ||
2693 | void | |
2694 | sort_variables (array) | |
2695 | SHELL_VAR **array; | |
2696 | { | |
2697 | qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp); | |
726f6388 JA |
2698 | } |
2699 | ||
2700 | static int | |
7117c2d2 JA |
2701 | qsort_var_comp (var1, var2) |
2702 | SHELL_VAR **var1, **var2; | |
726f6388 | 2703 | { |
7117c2d2 JA |
2704 | int result; |
2705 | ||
2706 | if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0) | |
2707 | result = strcmp ((*var1)->name, (*var2)->name); | |
2708 | ||
2709 | return (result); | |
726f6388 JA |
2710 | } |
2711 | ||
7117c2d2 JA |
2712 | /* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for |
2713 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
ccc6cda3 | 2714 | static SHELL_VAR ** |
7117c2d2 JA |
2715 | vapply (func) |
2716 | sh_var_map_func_t *func; | |
726f6388 JA |
2717 | { |
2718 | SHELL_VAR **list; | |
2719 | ||
7117c2d2 | 2720 | list = map_over (func, shell_variables); |
d166f048 | 2721 | if (list /* && posixly_correct */) |
726f6388 | 2722 | sort_variables (list); |
7117c2d2 JA |
2723 | return (list); |
2724 | } | |
726f6388 | 2725 | |
7117c2d2 JA |
2726 | /* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for |
2727 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
2728 | static SHELL_VAR ** | |
2729 | fapply (func) | |
2730 | sh_var_map_func_t *func; | |
2731 | { | |
2732 | SHELL_VAR **list; | |
2733 | ||
2734 | list = map_over_funcs (func); | |
2735 | if (list /* && posixly_correct */) | |
2736 | sort_variables (list); | |
726f6388 JA |
2737 | return (list); |
2738 | } | |
2739 | ||
7117c2d2 JA |
2740 | /* Create a NULL terminated array of all the shell variables. */ |
2741 | SHELL_VAR ** | |
2742 | all_shell_variables () | |
2743 | { | |
2744 | return (vapply ((sh_var_map_func_t *)NULL)); | |
2745 | } | |
2746 | ||
2747 | /* Create a NULL terminated array of all the shell functions. */ | |
2748 | SHELL_VAR ** | |
2749 | all_shell_functions () | |
2750 | { | |
2751 | return (fapply ((sh_var_map_func_t *)NULL)); | |
2752 | } | |
2753 | ||
2754 | static int | |
2755 | visible_var (var) | |
2756 | SHELL_VAR *var; | |
2757 | { | |
2758 | return (invisible_p (var) == 0); | |
2759 | } | |
2760 | ||
726f6388 | 2761 | SHELL_VAR ** |
bb70624e | 2762 | all_visible_functions () |
726f6388 | 2763 | { |
7117c2d2 | 2764 | return (fapply (visible_var)); |
ccc6cda3 | 2765 | } |
726f6388 | 2766 | |
ccc6cda3 | 2767 | SHELL_VAR ** |
bb70624e | 2768 | all_visible_variables () |
ccc6cda3 | 2769 | { |
7117c2d2 | 2770 | return (vapply (visible_var)); |
726f6388 JA |
2771 | } |
2772 | ||
ccc6cda3 JA |
2773 | /* Return non-zero if the variable VAR is visible and exported. Array |
2774 | variables cannot be exported. */ | |
726f6388 JA |
2775 | static int |
2776 | visible_and_exported (var) | |
2777 | SHELL_VAR *var; | |
2778 | { | |
ccc6cda3 | 2779 | return (invisible_p (var) == 0 && exported_p (var)); |
726f6388 JA |
2780 | } |
2781 | ||
7117c2d2 JA |
2782 | /* Return non-zero if VAR is a local variable in the current context and |
2783 | is exported. */ | |
2784 | static int | |
2785 | local_and_exported (var) | |
2786 | SHELL_VAR *var; | |
2787 | { | |
2788 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var)); | |
2789 | } | |
2790 | ||
bb70624e JA |
2791 | SHELL_VAR ** |
2792 | all_exported_variables () | |
2793 | { | |
7117c2d2 JA |
2794 | return (vapply (visible_and_exported)); |
2795 | } | |
bb70624e | 2796 | |
7117c2d2 JA |
2797 | SHELL_VAR ** |
2798 | local_exported_variables () | |
2799 | { | |
2800 | return (vapply (local_and_exported)); | |
2801 | } | |
2802 | ||
2803 | static int | |
2804 | variable_in_context (var) | |
2805 | SHELL_VAR *var; | |
2806 | { | |
2807 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context); | |
2808 | } | |
2809 | ||
2810 | SHELL_VAR ** | |
2811 | all_local_variables () | |
2812 | { | |
2813 | VARLIST *vlist; | |
2814 | SHELL_VAR **ret; | |
2815 | VAR_CONTEXT *vc; | |
2816 | ||
2817 | vc = shell_variables; | |
2818 | for (vc = shell_variables; vc; vc = vc->down) | |
2819 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
2820 | break; | |
2821 | ||
2822 | if (vc == 0) | |
2823 | { | |
b80f6443 | 2824 | internal_error (_("all_local_variables: no function context at current scope")); |
7117c2d2 JA |
2825 | return (SHELL_VAR **)NULL; |
2826 | } | |
2827 | if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0) | |
2828 | return (SHELL_VAR **)NULL; | |
2829 | ||
2830 | vlist = vlist_alloc (HASH_ENTRIES (vc->table)); | |
2831 | ||
2832 | flatten (vc->table, variable_in_context, vlist, 0); | |
2833 | ||
2834 | ret = vlist->list; | |
2835 | free (vlist); | |
2836 | if (ret) | |
2837 | sort_variables (ret); | |
2838 | return ret; | |
bb70624e JA |
2839 | } |
2840 | ||
2841 | #if defined (ARRAY_VARS) | |
2842 | /* Return non-zero if the variable VAR is visible and an array. */ | |
2843 | static int | |
2844 | visible_array_vars (var) | |
2845 | SHELL_VAR *var; | |
2846 | { | |
2847 | return (invisible_p (var) == 0 && array_p (var)); | |
2848 | } | |
2849 | ||
2850 | SHELL_VAR ** | |
2851 | all_array_variables () | |
2852 | { | |
7117c2d2 | 2853 | return (vapply (visible_array_vars)); |
bb70624e JA |
2854 | } |
2855 | #endif /* ARRAY_VARS */ | |
2856 | ||
2857 | char ** | |
2858 | all_variables_matching_prefix (prefix) | |
f73dda09 | 2859 | const char *prefix; |
bb70624e JA |
2860 | { |
2861 | SHELL_VAR **varlist; | |
2862 | char **rlist; | |
2863 | int vind, rind, plen; | |
2864 | ||
2865 | plen = STRLEN (prefix); | |
2866 | varlist = all_visible_variables (); | |
2867 | for (vind = 0; varlist && varlist[vind]; vind++) | |
2868 | ; | |
2869 | if (varlist == 0 || vind == 0) | |
2870 | return ((char **)NULL); | |
7117c2d2 | 2871 | rlist = strvec_create (vind + 1); |
bb70624e JA |
2872 | for (vind = rind = 0; varlist[vind]; vind++) |
2873 | { | |
2874 | if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen)) | |
28ef6c31 | 2875 | rlist[rind++] = savestring (varlist[vind]->name); |
bb70624e JA |
2876 | } |
2877 | rlist[rind] = (char *)0; | |
2878 | free (varlist); | |
2879 | ||
2880 | return rlist; | |
2881 | } | |
2882 | ||
7117c2d2 JA |
2883 | /* **************************************************************** */ |
2884 | /* */ | |
2885 | /* Managing temporary variable scopes */ | |
2886 | /* */ | |
2887 | /* **************************************************************** */ | |
2888 | ||
2889 | /* Make variable NAME have VALUE in the temporary environment. */ | |
2890 | static SHELL_VAR * | |
2891 | bind_tempenv_variable (name, value) | |
2892 | const char *name; | |
2893 | char *value; | |
2894 | { | |
2895 | SHELL_VAR *var; | |
2896 | ||
2897 | var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL; | |
2898 | ||
2899 | if (var) | |
2900 | { | |
2901 | FREE (value_cell (var)); | |
2902 | var_setvalue (var, savestring (value)); | |
2903 | INVALIDATE_EXPORTSTR (var); | |
2904 | } | |
2905 | ||
2906 | return (var); | |
2907 | } | |
2908 | ||
2909 | /* Find a variable in the temporary environment that is named NAME. | |
2910 | Return the SHELL_VAR *, or NULL if not found. */ | |
2911 | SHELL_VAR * | |
2912 | find_tempenv_variable (name) | |
2913 | const char *name; | |
2914 | { | |
2915 | return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL); | |
2916 | } | |
2917 | ||
2918 | /* Push the variable described by (SHELL_VAR *)DATA down to the next | |
2919 | variable context from the temporary environment. */ | |
2920 | static void | |
2921 | push_temp_var (data) | |
2922 | PTR_T data; | |
2923 | { | |
2924 | SHELL_VAR *var, *v; | |
2925 | HASH_TABLE *binding_table; | |
2926 | ||
2927 | var = (SHELL_VAR *)data; | |
2928 | ||
2929 | binding_table = shell_variables->table; | |
2930 | if (binding_table == 0) | |
2931 | { | |
2932 | if (shell_variables == global_variables) | |
2933 | /* shouldn't happen */ | |
2934 | binding_table = shell_variables->table = global_variables->table = hash_create (0); | |
2935 | else | |
2936 | binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS); | |
2937 | } | |
2938 | ||
95732b49 | 2939 | v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0); |
7117c2d2 JA |
2940 | |
2941 | /* XXX - should we set the context here? It shouldn't matter because of how | |
2942 | assign_in_env works, but might want to check. */ | |
2943 | if (binding_table == global_variables->table) /* XXX */ | |
2944 | var->attributes &= ~(att_tempvar|att_propagate); | |
2945 | else | |
2946 | { | |
2947 | var->attributes |= att_propagate; | |
2948 | if (binding_table == shell_variables->table) | |
2949 | shell_variables->flags |= VC_HASTMPVAR; | |
2950 | } | |
2951 | v->attributes |= var->attributes; | |
2952 | ||
2953 | dispose_variable (var); | |
2954 | } | |
2955 | ||
2956 | static void | |
2957 | propagate_temp_var (data) | |
2958 | PTR_T data; | |
2959 | { | |
2960 | SHELL_VAR *var; | |
2961 | ||
2962 | var = (SHELL_VAR *)data; | |
2963 | if (tempvar_p (var) && (var->attributes & att_propagate)) | |
2964 | push_temp_var (data); | |
2965 | else | |
2966 | dispose_variable (var); | |
2967 | } | |
2968 | ||
2969 | /* Free the storage used in the hash table for temporary | |
2970 | environment variables. PUSHF is a function to be called | |
2971 | to free each hash table entry. It takes care of pushing variables | |
2972 | to previous scopes if appropriate. */ | |
2973 | static void | |
2974 | dispose_temporary_env (pushf) | |
2975 | sh_free_func_t *pushf; | |
2976 | { | |
2977 | hash_flush (temporary_env, pushf); | |
2978 | hash_dispose (temporary_env); | |
2979 | temporary_env = (HASH_TABLE *)NULL; | |
2980 | ||
2981 | array_needs_making = 1; | |
2982 | ||
2983 | sv_ifs ("IFS"); /* XXX here for now */ | |
2984 | } | |
2985 | ||
2986 | void | |
2987 | dispose_used_env_vars () | |
2988 | { | |
2989 | if (temporary_env) | |
2990 | dispose_temporary_env (propagate_temp_var); | |
2991 | } | |
2992 | ||
2993 | /* Take all of the shell variables in the temporary environment HASH_TABLE | |
2994 | and make shell variables from them at the current variable context. */ | |
2995 | void | |
2996 | merge_temporary_env () | |
2997 | { | |
2998 | if (temporary_env) | |
2999 | dispose_temporary_env (push_temp_var); | |
3000 | } | |
3001 | ||
3002 | /* **************************************************************** */ | |
3003 | /* */ | |
3004 | /* Creating and manipulating the environment */ | |
3005 | /* */ | |
3006 | /* **************************************************************** */ | |
3007 | ||
bb70624e JA |
3008 | static inline char * |
3009 | mk_env_string (name, value) | |
f73dda09 | 3010 | const char *name, *value; |
bb70624e JA |
3011 | { |
3012 | int name_len, value_len; | |
3013 | char *p; | |
3014 | ||
3015 | name_len = strlen (name); | |
3016 | value_len = STRLEN (value); | |
f73dda09 | 3017 | p = (char *)xmalloc (2 + name_len + value_len); |
bb70624e JA |
3018 | strcpy (p, name); |
3019 | p[name_len] = '='; | |
3020 | if (value && *value) | |
3021 | strcpy (p + name_len + 1, value); | |
3022 | else | |
3023 | p[name_len + 1] = '\0'; | |
3024 | return (p); | |
3025 | } | |
3026 | ||
f73dda09 | 3027 | #ifdef DEBUG |
bb70624e JA |
3028 | /* Debugging */ |
3029 | static int | |
3030 | valid_exportstr (v) | |
3031 | SHELL_VAR *v; | |
3032 | { | |
3033 | char *s; | |
3034 | ||
3035 | s = v->exportstr; | |
f73dda09 | 3036 | if (legal_variable_starter ((unsigned char)*s) == 0) |
bb70624e | 3037 | { |
b80f6443 | 3038 | internal_error (_("invalid character %d in exportstr for %s"), *s, v->name); |
bb70624e JA |
3039 | return (0); |
3040 | } | |
3041 | for (s = v->exportstr + 1; s && *s; s++) | |
3042 | { | |
3043 | if (*s == '=') | |
28ef6c31 | 3044 | break; |
f73dda09 | 3045 | if (legal_variable_char ((unsigned char)*s) == 0) |
bb70624e | 3046 | { |
b80f6443 | 3047 | internal_error (_("invalid character %d in exportstr for %s"), *s, v->name); |
bb70624e JA |
3048 | return (0); |
3049 | } | |
3050 | } | |
3051 | if (*s != '=') | |
3052 | { | |
b80f6443 | 3053 | internal_error (_("no `=' in exportstr for %s"), v->name); |
bb70624e JA |
3054 | return (0); |
3055 | } | |
3056 | return (1); | |
3057 | } | |
f73dda09 | 3058 | #endif |
bb70624e | 3059 | |
7117c2d2 JA |
3060 | static char ** |
3061 | make_env_array_from_var_list (vars) | |
3062 | SHELL_VAR **vars; | |
726f6388 JA |
3063 | { |
3064 | register int i, list_index; | |
3065 | register SHELL_VAR *var; | |
ccc6cda3 | 3066 | char **list, *value; |
726f6388 | 3067 | |
7117c2d2 | 3068 | list = strvec_create ((1 + strvec_len ((char **)vars))); |
bb70624e JA |
3069 | |
3070 | #define USE_EXPORTSTR (value == var->exportstr) | |
726f6388 JA |
3071 | |
3072 | for (i = 0, list_index = 0; var = vars[i]; i++) | |
3073 | { | |
28ef6c31 JA |
3074 | #if defined (__CYGWIN__) |
3075 | /* We don't use the exportstr stuff on Cygwin at all. */ | |
3076 | INVALIDATE_EXPORTSTR (var); | |
bb70624e | 3077 | #endif |
28ef6c31 JA |
3078 | if (var->exportstr) |
3079 | value = var->exportstr; | |
bb70624e | 3080 | else if (function_p (var)) |
ccc6cda3 JA |
3081 | value = named_function_string ((char *)NULL, function_cell (var), 0); |
3082 | #if defined (ARRAY_VARS) | |
3083 | else if (array_p (var)) | |
3084 | # if 0 | |
3085 | value = array_to_assignment_string (array_cell (var)); | |
3086 | # else | |
3087 | continue; /* XXX array vars cannot yet be exported */ | |
3088 | # endif | |
3089 | #endif | |
726f6388 JA |
3090 | else |
3091 | value = value_cell (var); | |
3092 | ||
3093 | if (value) | |
3094 | { | |
bb70624e JA |
3095 | /* Gee, I'd like to get away with not using savestring() if we're |
3096 | using the cached exportstr... */ | |
3097 | list[list_index] = USE_EXPORTSTR ? savestring (value) | |
3098 | : mk_env_string (var->name, value); | |
3099 | ||
7117c2d2 JA |
3100 | if (USE_EXPORTSTR == 0) |
3101 | SAVE_EXPORTSTR (var, list[list_index]); | |
3102 | ||
726f6388 | 3103 | list_index++; |
bb70624e JA |
3104 | #undef USE_EXPORTSTR |
3105 | ||
3106 | #if 0 /* not yet */ | |
ccc6cda3 JA |
3107 | #if defined (ARRAY_VARS) |
3108 | if (array_p (var)) | |
3109 | free (value); | |
bb70624e | 3110 | #endif |
ccc6cda3 | 3111 | #endif |
726f6388 JA |
3112 | } |
3113 | } | |
3114 | ||
726f6388 JA |
3115 | list[list_index] = (char *)NULL; |
3116 | return (list); | |
3117 | } | |
3118 | ||
7117c2d2 JA |
3119 | /* Make an array of assignment statements from the hash table |
3120 | HASHED_VARS which contains SHELL_VARs. Only visible, exported | |
3121 | variables are eligible. */ | |
3122 | static char ** | |
3123 | make_var_export_array (vcxt) | |
3124 | VAR_CONTEXT *vcxt; | |
726f6388 | 3125 | { |
7117c2d2 JA |
3126 | char **list; |
3127 | SHELL_VAR **vars; | |
726f6388 | 3128 | |
7117c2d2 | 3129 | vars = map_over (visible_and_exported, vcxt); |
726f6388 | 3130 | |
7117c2d2 JA |
3131 | if (vars == 0) |
3132 | return (char **)NULL; | |
ccc6cda3 | 3133 | |
7117c2d2 | 3134 | list = make_env_array_from_var_list (vars); |
ccc6cda3 | 3135 | |
7117c2d2 JA |
3136 | free (vars); |
3137 | return (list); | |
ccc6cda3 JA |
3138 | } |
3139 | ||
7117c2d2 JA |
3140 | static char ** |
3141 | make_func_export_array () | |
726f6388 | 3142 | { |
7117c2d2 JA |
3143 | char **list; |
3144 | SHELL_VAR **vars; | |
ccc6cda3 | 3145 | |
7117c2d2 JA |
3146 | vars = map_over_funcs (visible_and_exported); |
3147 | if (vars == 0) | |
3148 | return (char **)NULL; | |
726f6388 | 3149 | |
7117c2d2 | 3150 | list = make_env_array_from_var_list (vars); |
28ef6c31 | 3151 | |
7117c2d2 JA |
3152 | free (vars); |
3153 | return (list); | |
bb70624e JA |
3154 | } |
3155 | ||
d166f048 JA |
3156 | /* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */ |
3157 | #define add_to_export_env(envstr,do_alloc) \ | |
3158 | do \ | |
3159 | { \ | |
3160 | if (export_env_index >= (export_env_size - 1)) \ | |
3161 | { \ | |
3162 | export_env_size += 16; \ | |
7117c2d2 | 3163 | export_env = strvec_resize (export_env, export_env_size); \ |
95732b49 | 3164 | environ = export_env; \ |
d166f048 JA |
3165 | } \ |
3166 | export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \ | |
3167 | export_env[export_env_index] = (char *)NULL; \ | |
3168 | } while (0) | |
3169 | ||
d166f048 JA |
3170 | /* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the |
3171 | array with the same left-hand side. Return the new EXPORT_ENV. */ | |
726f6388 | 3172 | char ** |
d166f048 | 3173 | add_or_supercede_exported_var (assign, do_alloc) |
726f6388 | 3174 | char *assign; |
d166f048 | 3175 | int do_alloc; |
726f6388 JA |
3176 | { |
3177 | register int i; | |
d166f048 | 3178 | int equal_offset; |
726f6388 | 3179 | |
b80f6443 | 3180 | equal_offset = assignment (assign, 0); |
d166f048 JA |
3181 | if (equal_offset == 0) |
3182 | return (export_env); | |
726f6388 | 3183 | |
7117c2d2 JA |
3184 | /* If this is a function, then only supersede the function definition. |
3185 | We do this by including the `=() {' in the comparison, like | |
3186 | initialize_shell_variables does. */ | |
3187 | if (assign[equal_offset + 1] == '(' && | |
3188 | strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */ | |
3189 | equal_offset += 4; | |
726f6388 | 3190 | |
d166f048 | 3191 | for (i = 0; i < export_env_index; i++) |
726f6388 | 3192 | { |
d166f048 | 3193 | if (STREQN (assign, export_env[i], equal_offset + 1)) |
726f6388 | 3194 | { |
d166f048 JA |
3195 | free (export_env[i]); |
3196 | export_env[i] = do_alloc ? savestring (assign) : assign; | |
3197 | return (export_env); | |
726f6388 JA |
3198 | } |
3199 | } | |
d166f048 JA |
3200 | add_to_export_env (assign, do_alloc); |
3201 | return (export_env); | |
726f6388 JA |
3202 | } |
3203 | ||
7117c2d2 JA |
3204 | static void |
3205 | add_temp_array_to_env (temp_array, do_alloc, do_supercede) | |
3206 | char **temp_array; | |
3207 | int do_alloc, do_supercede; | |
3208 | { | |
3209 | register int i; | |
3210 | ||
3211 | if (temp_array == 0) | |
3212 | return; | |
3213 | ||
3214 | for (i = 0; temp_array[i]; i++) | |
3215 | { | |
3216 | if (do_supercede) | |
3217 | export_env = add_or_supercede_exported_var (temp_array[i], do_alloc); | |
3218 | else | |
3219 | add_to_export_env (temp_array[i], do_alloc); | |
3220 | } | |
3221 | ||
3222 | free (temp_array); | |
3223 | } | |
3224 | ||
d166f048 | 3225 | /* Make the environment array for the command about to be executed, if the |
726f6388 JA |
3226 | array needs making. Otherwise, do nothing. If a shell action could |
3227 | change the array that commands receive for their environment, then the | |
7117c2d2 JA |
3228 | code should `array_needs_making++'. |
3229 | ||
3230 | The order to add to the array is: | |
3231 | temporary_env | |
3232 | list of var contexts whose head is shell_variables | |
3233 | shell_functions | |
3234 | ||
3235 | This is the shell variable lookup order. We add only new variable | |
3236 | names at each step, which allows local variables and variables in | |
3237 | the temporary environments to shadow variables in the global (or | |
3238 | any previous) scope. | |
3239 | */ | |
3240 | ||
3241 | static int | |
3242 | n_shell_variables () | |
3243 | { | |
3244 | VAR_CONTEXT *vc; | |
3245 | int n; | |
3246 | ||
3247 | for (n = 0, vc = shell_variables; vc; vc = vc->down) | |
3248 | n += HASH_ENTRIES (vc->table); | |
3249 | return n; | |
3250 | } | |
3251 | ||
726f6388 JA |
3252 | void |
3253 | maybe_make_export_env () | |
3254 | { | |
726f6388 | 3255 | register char **temp_array; |
d166f048 | 3256 | int new_size; |
7117c2d2 | 3257 | VAR_CONTEXT *tcxt; |
726f6388 JA |
3258 | |
3259 | if (array_needs_making) | |
3260 | { | |
3261 | if (export_env) | |
7117c2d2 | 3262 | strvec_flush (export_env); |
d166f048 JA |
3263 | |
3264 | /* Make a guess based on how many shell variables and functions we | |
3265 | have. Since there will always be array variables, and array | |
3266 | variables are not (yet) exported, this will always be big enough | |
7117c2d2 JA |
3267 | for the exported variables and functions. */ |
3268 | new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 + | |
3269 | HASH_ENTRIES (temporary_env); | |
d166f048 JA |
3270 | if (new_size > export_env_size) |
3271 | { | |
3272 | export_env_size = new_size; | |
7117c2d2 | 3273 | export_env = strvec_resize (export_env, export_env_size); |
95732b49 | 3274 | environ = export_env; |
d166f048 JA |
3275 | } |
3276 | export_env[export_env_index = 0] = (char *)NULL; | |
726f6388 | 3277 | |
7117c2d2 JA |
3278 | /* Make a dummy variable context from the temporary_env, stick it on |
3279 | the front of shell_variables, call make_var_export_array on the | |
3280 | whole thing to flatten it, and convert the list of SHELL_VAR *s | |
3281 | to the form needed by the environment. */ | |
3282 | if (temporary_env) | |
3283 | { | |
3284 | tcxt = new_var_context ((char *)NULL, 0); | |
3285 | tcxt->table = temporary_env; | |
3286 | tcxt->down = shell_variables; | |
3287 | } | |
3288 | else | |
3289 | tcxt = shell_variables; | |
3290 | ||
3291 | temp_array = make_var_export_array (tcxt); | |
d166f048 | 3292 | if (temp_array) |
7117c2d2 JA |
3293 | add_temp_array_to_env (temp_array, 0, 0); |
3294 | ||
3295 | if (tcxt != shell_variables) | |
3296 | free (tcxt); | |
726f6388 | 3297 | |
f73dda09 JA |
3298 | #if defined (RESTRICTED_SHELL) |
3299 | /* Restricted shells may not export shell functions. */ | |
7117c2d2 | 3300 | temp_array = restricted ? (char **)0 : make_func_export_array (); |
f73dda09 | 3301 | #else |
7117c2d2 | 3302 | temp_array = make_func_export_array (); |
f73dda09 | 3303 | #endif |
d166f048 | 3304 | if (temp_array) |
7117c2d2 | 3305 | add_temp_array_to_env (temp_array, 0, 0); |
726f6388 JA |
3306 | |
3307 | array_needs_making = 0; | |
3308 | } | |
3309 | } | |
3310 | ||
b72432fd JA |
3311 | /* This is an efficiency hack. PWD and OLDPWD are auto-exported, so |
3312 | we will need to remake the exported environment every time we | |
3313 | change directories. `_' is always put into the environment for | |
3314 | every external command, so without special treatment it will always | |
3315 | cause the environment to be remade. | |
3316 | ||
3317 | If there is no other reason to make the exported environment, we can | |
3318 | just update the variables in place and mark the exported environment | |
3319 | as no longer needing a remake. */ | |
3320 | void | |
3321 | update_export_env_inplace (env_prefix, preflen, value) | |
3322 | char *env_prefix; | |
3323 | int preflen; | |
3324 | char *value; | |
3325 | { | |
3326 | char *evar; | |
3327 | ||
f73dda09 | 3328 | evar = (char *)xmalloc (STRLEN (value) + preflen + 1); |
b72432fd JA |
3329 | strcpy (evar, env_prefix); |
3330 | if (value) | |
3331 | strcpy (evar + preflen, value); | |
3332 | export_env = add_or_supercede_exported_var (evar, 0); | |
3333 | } | |
3334 | ||
726f6388 JA |
3335 | /* We always put _ in the environment as the name of this command. */ |
3336 | void | |
3337 | put_command_name_into_env (command_name) | |
3338 | char *command_name; | |
3339 | { | |
b72432fd | 3340 | update_export_env_inplace ("_=", 2, command_name); |
726f6388 JA |
3341 | } |
3342 | ||
cce855bc | 3343 | #if 0 /* UNUSED -- it caused too many problems */ |
ccc6cda3 JA |
3344 | void |
3345 | put_gnu_argv_flags_into_env (pid, flags_string) | |
7117c2d2 | 3346 | intmax_t pid; |
ccc6cda3 JA |
3347 | char *flags_string; |
3348 | { | |
3349 | char *dummy, *pbuf; | |
3350 | int l, fl; | |
3351 | ||
3352 | pbuf = itos (pid); | |
3353 | l = strlen (pbuf); | |
3354 | ||
3355 | fl = strlen (flags_string); | |
3356 | ||
f73dda09 | 3357 | dummy = (char *)xmalloc (l + fl + 30); |
ccc6cda3 JA |
3358 | dummy[0] = '_'; |
3359 | strcpy (dummy + 1, pbuf); | |
3360 | strcpy (dummy + 1 + l, "_GNU_nonoption_argv_flags_"); | |
3361 | dummy[l + 27] = '='; | |
3362 | strcpy (dummy + l + 28, flags_string); | |
3363 | ||
3364 | free (pbuf); | |
3365 | ||
d166f048 | 3366 | export_env = add_or_supercede_exported_var (dummy, 0); |
ccc6cda3 | 3367 | } |
cce855bc | 3368 | #endif |
726f6388 | 3369 | |
7117c2d2 JA |
3370 | /* **************************************************************** */ |
3371 | /* */ | |
3372 | /* Managing variable contexts */ | |
3373 | /* */ | |
3374 | /* **************************************************************** */ | |
3375 | ||
3376 | /* Allocate and return a new variable context with NAME and FLAGS. | |
3377 | NAME can be NULL. */ | |
726f6388 | 3378 | |
7117c2d2 JA |
3379 | VAR_CONTEXT * |
3380 | new_var_context (name, flags) | |
3381 | char *name; | |
3382 | int flags; | |
3383 | { | |
3384 | VAR_CONTEXT *vc; | |
3385 | ||
3386 | vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT)); | |
3387 | vc->name = name ? savestring (name) : (char *)NULL; | |
3388 | vc->scope = variable_context; | |
3389 | vc->flags = flags; | |
3390 | ||
3391 | vc->up = vc->down = (VAR_CONTEXT *)NULL; | |
3392 | vc->table = (HASH_TABLE *)NULL; | |
3393 | ||
3394 | return vc; | |
3395 | } | |
3396 | ||
3397 | /* Free a variable context and its data, including the hash table. Dispose | |
3398 | all of the variables. */ | |
3399 | void | |
3400 | dispose_var_context (vc) | |
3401 | VAR_CONTEXT *vc; | |
3402 | { | |
3403 | FREE (vc->name); | |
3404 | ||
3405 | if (vc->table) | |
3406 | { | |
3407 | delete_all_variables (vc->table); | |
3408 | hash_dispose (vc->table); | |
3409 | } | |
3410 | ||
3411 | free (vc); | |
3412 | } | |
3413 | ||
3414 | /* Set VAR's scope level to the current variable context. */ | |
3415 | static int | |
3416 | set_context (var) | |
3417 | SHELL_VAR *var; | |
3418 | { | |
3419 | return (var->context = variable_context); | |
3420 | } | |
3421 | ||
3422 | /* Make a new variable context with NAME and FLAGS and a HASH_TABLE of | |
3423 | temporary variables, and push it onto shell_variables. This is | |
3424 | for shell functions. */ | |
3425 | VAR_CONTEXT * | |
3426 | push_var_context (name, flags, tempvars) | |
3427 | char *name; | |
3428 | int flags; | |
3429 | HASH_TABLE *tempvars; | |
3430 | { | |
3431 | VAR_CONTEXT *vc; | |
3432 | ||
3433 | vc = new_var_context (name, flags); | |
3434 | vc->table = tempvars; | |
3435 | if (tempvars) | |
3436 | { | |
3437 | /* Have to do this because the temp environment was created before | |
3438 | variable_context was incremented. */ | |
3439 | flatten (tempvars, set_context, (VARLIST *)NULL, 0); | |
3440 | vc->flags |= VC_HASTMPVAR; | |
3441 | } | |
3442 | vc->down = shell_variables; | |
3443 | shell_variables->up = vc; | |
3444 | ||
3445 | return (shell_variables = vc); | |
3446 | } | |
3447 | ||
3448 | static void | |
3449 | push_func_var (data) | |
3450 | PTR_T data; | |
3451 | { | |
3452 | SHELL_VAR *var, *v; | |
3453 | ||
3454 | var = (SHELL_VAR *)data; | |
3455 | ||
3456 | if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate))) | |
3457 | { | |
3458 | /* XXX - should we set v->context here? */ | |
95732b49 | 3459 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0); |
7117c2d2 JA |
3460 | if (shell_variables == global_variables) |
3461 | var->attributes &= ~(att_tempvar|att_propagate); | |
3462 | else | |
3463 | shell_variables->flags |= VC_HASTMPVAR; | |
3464 | v->attributes |= var->attributes; | |
3465 | } | |
3466 | ||
3467 | dispose_variable (var); | |
3468 | } | |
3469 | ||
3470 | /* Pop the top context off of VCXT and dispose of it, returning the rest of | |
3471 | the stack. */ | |
3472 | void | |
3473 | pop_var_context () | |
3474 | { | |
3475 | VAR_CONTEXT *ret, *vcxt; | |
3476 | ||
3477 | vcxt = shell_variables; | |
3478 | if (vc_isfuncenv (vcxt) == 0) | |
3479 | { | |
b80f6443 | 3480 | internal_error (_("pop_var_context: head of shell_variables not a function context")); |
7117c2d2 JA |
3481 | return; |
3482 | } | |
3483 | ||
3484 | if (ret = vcxt->down) | |
3485 | { | |
3486 | ret->up = (VAR_CONTEXT *)NULL; | |
3487 | shell_variables = ret; | |
3488 | if (vcxt->table) | |
3489 | hash_flush (vcxt->table, push_func_var); | |
3490 | dispose_var_context (vcxt); | |
3491 | } | |
3492 | else | |
b80f6443 | 3493 | internal_error (_("pop_var_context: no global_variables context")); |
7117c2d2 JA |
3494 | } |
3495 | ||
3496 | /* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and | |
3497 | all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */ | |
3498 | void | |
3499 | delete_all_contexts (vcxt) | |
3500 | VAR_CONTEXT *vcxt; | |
3501 | { | |
3502 | VAR_CONTEXT *v, *t; | |
3503 | ||
3504 | for (v = vcxt; v != global_variables; v = t) | |
3505 | { | |
3506 | t = v->down; | |
3507 | dispose_var_context (v); | |
3508 | } | |
3509 | ||
3510 | delete_all_variables (global_variables->table); | |
3511 | shell_variables = global_variables; | |
3512 | } | |
3513 | ||
3514 | /* **************************************************************** */ | |
3515 | /* */ | |
3516 | /* Pushing and Popping temporary variable scopes */ | |
3517 | /* */ | |
3518 | /* **************************************************************** */ | |
3519 | ||
3520 | VAR_CONTEXT * | |
3521 | push_scope (flags, tmpvars) | |
3522 | int flags; | |
3523 | HASH_TABLE *tmpvars; | |
3524 | { | |
3525 | return (push_var_context ((char *)NULL, flags, tmpvars)); | |
3526 | } | |
3527 | ||
3528 | static void | |
3529 | push_exported_var (data) | |
3530 | PTR_T data; | |
3531 | { | |
3532 | SHELL_VAR *var, *v; | |
3533 | ||
3534 | var = (SHELL_VAR *)data; | |
3535 | ||
3536 | /* If a temp var had its export attribute set, or it's marked to be | |
3537 | propagated, bind it in the previous scope before disposing it. */ | |
95732b49 JA |
3538 | /* XXX - This isn't exactly right, because all tempenv variables have the |
3539 | export attribute set. */ | |
3540 | #if 0 | |
7117c2d2 | 3541 | if (exported_p (var) || (var->attributes & att_propagate)) |
95732b49 JA |
3542 | #else |
3543 | if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate)) | |
3544 | #endif | |
7117c2d2 JA |
3545 | { |
3546 | var->attributes &= ~att_tempvar; /* XXX */ | |
95732b49 | 3547 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0); |
7117c2d2 JA |
3548 | if (shell_variables == global_variables) |
3549 | var->attributes &= ~att_propagate; | |
3550 | v->attributes |= var->attributes; | |
3551 | } | |
3552 | ||
3553 | dispose_variable (var); | |
3554 | } | |
3555 | ||
3556 | void | |
3557 | pop_scope (is_special) | |
3558 | int is_special; | |
3559 | { | |
3560 | VAR_CONTEXT *vcxt, *ret; | |
3561 | ||
3562 | vcxt = shell_variables; | |
3563 | if (vc_istempscope (vcxt) == 0) | |
3564 | { | |
b80f6443 | 3565 | internal_error (_("pop_scope: head of shell_variables not a temporary environment scope")); |
7117c2d2 JA |
3566 | return; |
3567 | } | |
3568 | ||
3569 | ret = vcxt->down; | |
3570 | if (ret) | |
3571 | ret->up = (VAR_CONTEXT *)NULL; | |
3572 | ||
3573 | shell_variables = ret; | |
3574 | ||
3575 | /* Now we can take care of merging variables in VCXT into set of scopes | |
3576 | whose head is RET (shell_variables). */ | |
3577 | FREE (vcxt->name); | |
3578 | if (vcxt->table) | |
3579 | { | |
3580 | if (is_special) | |
3581 | hash_flush (vcxt->table, push_func_var); | |
3582 | else | |
3583 | hash_flush (vcxt->table, push_exported_var); | |
3584 | hash_dispose (vcxt->table); | |
3585 | } | |
3586 | free (vcxt); | |
3587 | ||
3588 | sv_ifs ("IFS"); /* XXX here for now */ | |
3589 | } | |
3590 | ||
3591 | /* **************************************************************** */ | |
3592 | /* */ | |
3593 | /* Pushing and Popping function contexts */ | |
3594 | /* */ | |
3595 | /* **************************************************************** */ | |
3596 | ||
3597 | static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL; | |
3598 | static int dollar_arg_stack_slots; | |
3599 | static int dollar_arg_stack_index; | |
3600 | ||
3601 | /* XXX - we might want to consider pushing and popping the `getopts' state | |
3602 | when we modify the positional parameters. */ | |
3603 | void | |
3604 | push_context (name, is_subshell, tempvars) | |
3605 | char *name; /* function name */ | |
3606 | int is_subshell; | |
3607 | HASH_TABLE *tempvars; | |
3608 | { | |
3609 | if (is_subshell == 0) | |
3610 | push_dollar_vars (); | |
3611 | variable_context++; | |
3612 | push_var_context (name, VC_FUNCENV, tempvars); | |
3613 | } | |
3614 | ||
3615 | /* Only called when subshell == 0, so we don't need to check, and can | |
3616 | unconditionally pop the dollar vars off the stack. */ | |
3617 | void | |
3618 | pop_context () | |
726f6388 | 3619 | { |
7117c2d2 JA |
3620 | pop_dollar_vars (); |
3621 | variable_context--; | |
3622 | pop_var_context (); | |
726f6388 | 3623 | |
7117c2d2 JA |
3624 | sv_ifs ("IFS"); /* XXX here for now */ |
3625 | } | |
726f6388 | 3626 | |
7117c2d2 JA |
3627 | /* Save the existing positional parameters on a stack. */ |
3628 | void | |
3629 | push_dollar_vars () | |
3630 | { | |
3631 | if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots) | |
3632 | { | |
3633 | dollar_arg_stack = (WORD_LIST **) | |
3634 | xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10) | |
3635 | * sizeof (WORD_LIST **)); | |
3636 | } | |
3637 | dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args (); | |
3638 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
3639 | } | |
726f6388 | 3640 | |
7117c2d2 JA |
3641 | /* Restore the positional parameters from our stack. */ |
3642 | void | |
3643 | pop_dollar_vars () | |
3644 | { | |
3645 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
3646 | return; | |
726f6388 | 3647 | |
7117c2d2 JA |
3648 | remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1); |
3649 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); | |
3650 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
3651 | set_dollar_vars_unchanged (); | |
3652 | } | |
ccc6cda3 | 3653 | |
7117c2d2 JA |
3654 | void |
3655 | dispose_saved_dollar_vars () | |
3656 | { | |
3657 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
3658 | return; | |
726f6388 | 3659 | |
7117c2d2 JA |
3660 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); |
3661 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
726f6388 | 3662 | } |
cce855bc | 3663 | |
b80f6443 JA |
3664 | /* Manipulate the special BASH_ARGV and BASH_ARGC variables. */ |
3665 | ||
3666 | void | |
3667 | push_args (list) | |
3668 | WORD_LIST *list; | |
3669 | { | |
3670 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
3671 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
3672 | ARRAY *bash_argv_a, *bash_argc_a; | |
3673 | WORD_LIST *l; | |
3674 | arrayind_t i; | |
3675 | char *t; | |
3676 | ||
3677 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
3678 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
3679 | ||
3680 | for (l = list, i = 0; l; l = l->next, i++) | |
3681 | array_push (bash_argv_a, l->word->word); | |
3682 | ||
3683 | t = itos (i); | |
3684 | array_push (bash_argc_a, t); | |
3685 | free (t); | |
3686 | #endif /* ARRAY_VARS && DEBUGGER */ | |
3687 | } | |
3688 | ||
3689 | /* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC | |
3690 | array and use that value as the count of elements to remove from | |
3691 | BASH_ARGV. */ | |
3692 | void | |
3693 | pop_args () | |
3694 | { | |
3695 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
3696 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
3697 | ARRAY *bash_argv_a, *bash_argc_a; | |
3698 | ARRAY_ELEMENT *ce; | |
3699 | intmax_t i; | |
3700 | ||
3701 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
3702 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
3703 | ||
3704 | ce = array_shift (bash_argc_a, 1, 0); | |
3705 | if (ce == 0 || legal_number (element_value (ce), &i) == 0) | |
3706 | i = 0; | |
3707 | ||
3708 | for ( ; i > 0; i--) | |
3709 | array_pop (bash_argv_a); | |
3710 | array_dispose_element (ce); | |
3711 | #endif /* ARRAY_VARS && DEBUGGER */ | |
3712 | } | |
3713 | ||
cce855bc JA |
3714 | /************************************************* |
3715 | * * | |
3716 | * Functions to manage special variables * | |
3717 | * * | |
3718 | *************************************************/ | |
3719 | ||
3720 | /* Extern declarations for variables this code has to manage. */ | |
3721 | extern int eof_encountered, eof_encountered_limit, ignoreeof; | |
3722 | ||
3723 | #if defined (READLINE) | |
cce855bc JA |
3724 | extern int hostname_list_initialized; |
3725 | #endif | |
3726 | ||
3727 | /* An alist of name.function for each special variable. Most of the | |
3728 | functions don't do much, and in fact, this would be faster with a | |
3729 | switch statement, but by the end of this file, I am sick of switch | |
3730 | statements. */ | |
3731 | ||
3732 | #define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0 | |
3733 | ||
7117c2d2 | 3734 | /* This table will be sorted with qsort() the first time it's accessed. */ |
cce855bc JA |
3735 | struct name_and_function { |
3736 | char *name; | |
f73dda09 | 3737 | sh_sv_func_t *function; |
7117c2d2 | 3738 | }; |
cce855bc | 3739 | |
7117c2d2 | 3740 | static struct name_and_function special_vars[] = { |
95732b49 JA |
3741 | #if defined (READLINE) |
3742 | # if defined (STRICT_POSIX) | |
3743 | { "COLUMNS", sv_winsize }, | |
3744 | # endif | |
3745 | { "COMP_WORDBREAKS", sv_comp_wordbreaks }, | |
3746 | #endif | |
3747 | ||
cce855bc JA |
3748 | { "GLOBIGNORE", sv_globignore }, |
3749 | ||
cce855bc | 3750 | #if defined (HISTORY) |
7117c2d2 JA |
3751 | { "HISTCONTROL", sv_history_control }, |
3752 | { "HISTFILESIZE", sv_histsize }, | |
cce855bc JA |
3753 | { "HISTIGNORE", sv_histignore }, |
3754 | { "HISTSIZE", sv_histsize }, | |
b80f6443 | 3755 | { "HISTTIMEFORMAT", sv_histtimefmt }, |
7117c2d2 | 3756 | #endif |
cce855bc | 3757 | |
95732b49 JA |
3758 | #if defined (__CYGWIN__) |
3759 | { "HOME", sv_home }, | |
3760 | #endif | |
3761 | ||
7117c2d2 JA |
3762 | #if defined (READLINE) |
3763 | { "HOSTFILE", sv_hostfile }, | |
3764 | #endif | |
cce855bc | 3765 | |
7117c2d2 JA |
3766 | { "IFS", sv_ifs }, |
3767 | { "IGNOREEOF", sv_ignoreeof }, | |
cce855bc | 3768 | |
7117c2d2 | 3769 | { "LANG", sv_locale }, |
cce855bc JA |
3770 | { "LC_ALL", sv_locale }, |
3771 | { "LC_COLLATE", sv_locale }, | |
3772 | { "LC_CTYPE", sv_locale }, | |
3773 | { "LC_MESSAGES", sv_locale }, | |
bb70624e | 3774 | { "LC_NUMERIC", sv_locale }, |
95732b49 JA |
3775 | { "LC_TIME", sv_locale }, |
3776 | ||
3777 | #if defined (READLINE) && defined (STRICT_POSIX) | |
3778 | { "LINES", sv_winsize }, | |
3779 | #endif | |
7117c2d2 JA |
3780 | |
3781 | { "MAIL", sv_mail }, | |
3782 | { "MAILCHECK", sv_mail }, | |
3783 | { "MAILPATH", sv_mail }, | |
3784 | ||
3785 | { "OPTERR", sv_opterr }, | |
3786 | { "OPTIND", sv_optind }, | |
3787 | ||
3788 | { "PATH", sv_path }, | |
3789 | { "POSIXLY_CORRECT", sv_strict_posix }, | |
3790 | ||
3791 | #if defined (READLINE) | |
3792 | { "TERM", sv_terminal }, | |
3793 | { "TERMCAP", sv_terminal }, | |
3794 | { "TERMINFO", sv_terminal }, | |
3795 | #endif /* READLINE */ | |
3796 | ||
3797 | { "TEXTDOMAIN", sv_locale }, | |
3798 | { "TEXTDOMAINDIR", sv_locale }, | |
cce855bc JA |
3799 | |
3800 | #if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE) | |
3801 | { "TZ", sv_tz }, | |
3802 | #endif | |
3803 | ||
7117c2d2 JA |
3804 | #if defined (HISTORY) && defined (BANG_HISTORY) |
3805 | { "histchars", sv_histchars }, | |
3806 | #endif /* HISTORY && BANG_HISTORY */ | |
3807 | ||
3808 | { "ignoreeof", sv_ignoreeof }, | |
3809 | ||
f73dda09 | 3810 | { (char *)0, (sh_sv_func_t *)0 } |
cce855bc JA |
3811 | }; |
3812 | ||
7117c2d2 JA |
3813 | #define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1) |
3814 | ||
3815 | static int | |
3816 | sv_compare (sv1, sv2) | |
3817 | struct name_and_function *sv1, *sv2; | |
3818 | { | |
3819 | int r; | |
3820 | ||
3821 | if ((r = sv1->name[0] - sv2->name[0]) == 0) | |
3822 | r = strcmp (sv1->name, sv2->name); | |
3823 | return r; | |
3824 | } | |
3825 | ||
3826 | static inline int | |
3827 | find_special_var (name) | |
3828 | const char *name; | |
3829 | { | |
3830 | register int i, r; | |
3831 | ||
3832 | for (i = 0; special_vars[i].name; i++) | |
3833 | { | |
3834 | r = special_vars[i].name[0] - name[0]; | |
3835 | if (r == 0) | |
3836 | r = strcmp (special_vars[i].name, name); | |
3837 | if (r == 0) | |
3838 | return i; | |
3839 | else if (r > 0) | |
3840 | /* Can't match any of rest of elements in sorted list. Take this out | |
3841 | if it causes problems in certain environments. */ | |
3842 | break; | |
3843 | } | |
3844 | return -1; | |
3845 | } | |
3846 | ||
cce855bc JA |
3847 | /* The variable in NAME has just had its state changed. Check to see if it |
3848 | is one of the special ones where something special happens. */ | |
3849 | void | |
3850 | stupidly_hack_special_variables (name) | |
3851 | char *name; | |
3852 | { | |
7117c2d2 | 3853 | static int sv_sorted = 0; |
cce855bc JA |
3854 | int i; |
3855 | ||
7117c2d2 | 3856 | if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */ |
cce855bc | 3857 | { |
7117c2d2 JA |
3858 | qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]), |
3859 | (QSFUNC *)sv_compare); | |
3860 | sv_sorted = 1; | |
cce855bc | 3861 | } |
7117c2d2 JA |
3862 | |
3863 | i = find_special_var (name); | |
3864 | if (i != -1) | |
3865 | (*(special_vars[i].function)) (name); | |
3866 | } | |
3867 | ||
3868 | void | |
3869 | sv_ifs (name) | |
3870 | char *name; | |
3871 | { | |
3872 | SHELL_VAR *v; | |
3873 | ||
3874 | v = find_variable ("IFS"); | |
3875 | setifs (v); | |
cce855bc JA |
3876 | } |
3877 | ||
3878 | /* What to do just after the PATH variable has changed. */ | |
3879 | void | |
3880 | sv_path (name) | |
3881 | char *name; | |
3882 | { | |
3883 | /* hash -r */ | |
7117c2d2 | 3884 | phash_flush (); |
cce855bc JA |
3885 | } |
3886 | ||
3887 | /* What to do just after one of the MAILxxxx variables has changed. NAME | |
3888 | is the name of the variable. This is called with NAME set to one of | |
3889 | MAIL, MAILCHECK, or MAILPATH. */ | |
3890 | void | |
3891 | sv_mail (name) | |
3892 | char *name; | |
3893 | { | |
3894 | /* If the time interval for checking the files has changed, then | |
3895 | reset the mail timer. Otherwise, one of the pathname vars | |
3896 | to the users mailbox has changed, so rebuild the array of | |
3897 | filenames. */ | |
3898 | if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */ | |
3899 | reset_mail_timer (); | |
3900 | else | |
3901 | { | |
3902 | free_mail_files (); | |
3903 | remember_mail_dates (); | |
3904 | } | |
3905 | } | |
3906 | ||
3907 | /* What to do when GLOBIGNORE changes. */ | |
3908 | void | |
3909 | sv_globignore (name) | |
3910 | char *name; | |
3911 | { | |
3912 | setup_glob_ignore (name); | |
3913 | } | |
3914 | ||
3915 | #if defined (READLINE) | |
95732b49 JA |
3916 | void |
3917 | sv_comp_wordbreaks (name) | |
3918 | char *name; | |
3919 | { | |
3920 | SHELL_VAR *sv; | |
3921 | ||
3922 | sv = find_variable (name); | |
3923 | if (sv == 0) | |
3924 | rl_completer_word_break_characters = (char *)NULL; | |
3925 | } | |
3926 | ||
cce855bc JA |
3927 | /* What to do just after one of the TERMxxx variables has changed. |
3928 | If we are an interactive shell, then try to reset the terminal | |
3929 | information in readline. */ | |
3930 | void | |
3931 | sv_terminal (name) | |
3932 | char *name; | |
3933 | { | |
3934 | if (interactive_shell && no_line_editing == 0) | |
3935 | rl_reset_terminal (get_string_value ("TERM")); | |
3936 | } | |
3937 | ||
3938 | void | |
3939 | sv_hostfile (name) | |
3940 | char *name; | |
3941 | { | |
bb70624e JA |
3942 | SHELL_VAR *v; |
3943 | ||
3944 | v = find_variable (name); | |
3945 | if (v == 0) | |
3946 | clear_hostname_list (); | |
3947 | else | |
3948 | hostname_list_initialized = 0; | |
cce855bc | 3949 | } |
95732b49 JA |
3950 | |
3951 | #if defined (STRICT_POSIX) | |
3952 | /* In strict posix mode, we allow assignments to LINES and COLUMNS (and values | |
3953 | found in the initial environment) to override the terminal size reported by | |
3954 | the kernel. */ | |
3955 | void | |
3956 | sv_winsize (name) | |
3957 | char *name; | |
3958 | { | |
3959 | SHELL_VAR *v; | |
3960 | intmax_t xd; | |
3961 | int d; | |
3962 | ||
3963 | if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing) | |
3964 | return; | |
3965 | ||
3966 | v = find_variable (name); | |
3967 | if (v == 0 || var_isnull (v)) | |
3968 | rl_reset_screen_size (); | |
3969 | else | |
3970 | { | |
3971 | if (legal_number (value_cell (v), &xd) == 0) | |
3972 | return; | |
3973 | winsize_assignment = winsize_assigned = 1; | |
3974 | d = xd; /* truncate */ | |
3975 | if (name[0] == 'L') /* LINES */ | |
3976 | rl_set_screen_size (d, -1); | |
3977 | else /* COLUMNS */ | |
3978 | rl_set_screen_size (-1, d); | |
3979 | winsize_assignment = 0; | |
3980 | } | |
3981 | } | |
3982 | #endif /* STRICT_POSIX */ | |
cce855bc JA |
3983 | #endif /* READLINE */ |
3984 | ||
95732b49 JA |
3985 | /* Update the value of HOME in the export environment so tilde expansion will |
3986 | work on cygwin. */ | |
3987 | #if defined (__CYGWIN__) | |
3988 | sv_home (name) | |
3989 | char *name; | |
3990 | { | |
3991 | array_needs_making = 1; | |
3992 | maybe_make_export_env (); | |
3993 | } | |
3994 | #endif | |
3995 | ||
cce855bc JA |
3996 | #if defined (HISTORY) |
3997 | /* What to do after the HISTSIZE or HISTFILESIZE variables change. | |
3998 | If there is a value for this HISTSIZE (and it is numeric), then stifle | |
3999 | the history. Otherwise, if there is NO value for this variable, | |
4000 | unstifle the history. If name is HISTFILESIZE, and its value is | |
4001 | numeric, truncate the history file to hold no more than that many | |
4002 | lines. */ | |
4003 | void | |
4004 | sv_histsize (name) | |
4005 | char *name; | |
4006 | { | |
4007 | char *temp; | |
7117c2d2 | 4008 | intmax_t num; |
95732b49 | 4009 | int hmax; |
cce855bc JA |
4010 | |
4011 | temp = get_string_value (name); | |
4012 | ||
4013 | if (temp && *temp) | |
4014 | { | |
4015 | if (legal_number (temp, &num)) | |
28ef6c31 | 4016 | { |
cce855bc JA |
4017 | if (name[4] == 'S') |
4018 | { | |
95732b49 JA |
4019 | hmax = num; |
4020 | stifle_history (hmax); | |
cce855bc JA |
4021 | num = where_history (); |
4022 | if (history_lines_this_session > num) | |
4023 | history_lines_this_session = num; | |
4024 | } | |
4025 | else | |
4026 | { | |
4027 | history_truncate_file (get_string_value ("HISTFILE"), (int)num); | |
4028 | if (num <= history_lines_in_file) | |
4029 | history_lines_in_file = num; | |
4030 | } | |
4031 | } | |
4032 | } | |
4033 | else if (name[4] == 'S') | |
4034 | unstifle_history (); | |
4035 | } | |
4036 | ||
4037 | /* What to do after the HISTIGNORE variable changes. */ | |
4038 | void | |
4039 | sv_histignore (name) | |
4040 | char *name; | |
4041 | { | |
4042 | setup_history_ignore (name); | |
4043 | } | |
4044 | ||
4045 | /* What to do after the HISTCONTROL variable changes. */ | |
4046 | void | |
4047 | sv_history_control (name) | |
4048 | char *name; | |
4049 | { | |
4050 | char *temp; | |
b80f6443 JA |
4051 | char *val; |
4052 | int tptr; | |
cce855bc JA |
4053 | |
4054 | history_control = 0; | |
4055 | temp = get_string_value (name); | |
4056 | ||
b80f6443 JA |
4057 | if (temp == 0 || *temp == 0) |
4058 | return; | |
4059 | ||
4060 | tptr = 0; | |
4061 | while (val = extract_colon_unit (temp, &tptr)) | |
cce855bc | 4062 | { |
b80f6443 JA |
4063 | if (STREQ (val, "ignorespace")) |
4064 | history_control |= HC_IGNSPACE; | |
4065 | else if (STREQ (val, "ignoredups")) | |
4066 | history_control |= HC_IGNDUPS; | |
4067 | else if (STREQ (val, "ignoreboth")) | |
4068 | history_control |= HC_IGNBOTH; | |
4069 | else if (STREQ (val, "erasedups")) | |
4070 | history_control |= HC_ERASEDUPS; | |
4071 | ||
4072 | free (val); | |
cce855bc JA |
4073 | } |
4074 | } | |
4075 | ||
4076 | #if defined (BANG_HISTORY) | |
4077 | /* Setting/unsetting of the history expansion character. */ | |
4078 | void | |
4079 | sv_histchars (name) | |
4080 | char *name; | |
4081 | { | |
4082 | char *temp; | |
4083 | ||
4084 | temp = get_string_value (name); | |
4085 | if (temp) | |
4086 | { | |
4087 | history_expansion_char = *temp; | |
4088 | if (temp[0] && temp[1]) | |
4089 | { | |
4090 | history_subst_char = temp[1]; | |
4091 | if (temp[2]) | |
4092 | history_comment_char = temp[2]; | |
4093 | } | |
4094 | } | |
4095 | else | |
4096 | { | |
4097 | history_expansion_char = '!'; | |
4098 | history_subst_char = '^'; | |
4099 | history_comment_char = '#'; | |
4100 | } | |
4101 | } | |
4102 | #endif /* BANG_HISTORY */ | |
b80f6443 JA |
4103 | |
4104 | void | |
4105 | sv_histtimefmt (name) | |
4106 | char *name; | |
4107 | { | |
4108 | SHELL_VAR *v; | |
4109 | ||
4110 | v = find_variable (name); | |
4111 | history_write_timestamps = (v != 0); | |
4112 | } | |
cce855bc JA |
4113 | #endif /* HISTORY */ |
4114 | ||
4115 | #if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE) | |
4116 | void | |
4117 | sv_tz (name) | |
4118 | char *name; | |
4119 | { | |
4120 | tzset (); | |
4121 | } | |
4122 | #endif | |
4123 | ||
4124 | /* If the variable exists, then the value of it can be the number | |
4125 | of times we actually ignore the EOF. The default is small, | |
4126 | (smaller than csh, anyway). */ | |
4127 | void | |
4128 | sv_ignoreeof (name) | |
4129 | char *name; | |
4130 | { | |
4131 | SHELL_VAR *tmp_var; | |
4132 | char *temp; | |
4133 | ||
4134 | eof_encountered = 0; | |
4135 | ||
4136 | tmp_var = find_variable (name); | |
4137 | ignoreeof = tmp_var != 0; | |
4138 | temp = tmp_var ? value_cell (tmp_var) : (char *)NULL; | |
4139 | if (temp) | |
4140 | eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10; | |
4141 | set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */ | |
4142 | } | |
4143 | ||
4144 | void | |
4145 | sv_optind (name) | |
4146 | char *name; | |
4147 | { | |
4148 | char *tt; | |
4149 | int s; | |
4150 | ||
4151 | tt = get_string_value ("OPTIND"); | |
4152 | if (tt && *tt) | |
4153 | { | |
4154 | s = atoi (tt); | |
4155 | ||
4156 | /* According to POSIX, setting OPTIND=1 resets the internal state | |
4157 | of getopt (). */ | |
4158 | if (s < 0 || s == 1) | |
4159 | s = 0; | |
4160 | } | |
4161 | else | |
4162 | s = 0; | |
4163 | getopts_reset (s); | |
4164 | } | |
4165 | ||
4166 | void | |
4167 | sv_opterr (name) | |
4168 | char *name; | |
4169 | { | |
4170 | char *tt; | |
4171 | ||
4172 | tt = get_string_value ("OPTERR"); | |
4173 | sh_opterr = (tt && *tt) ? atoi (tt) : 1; | |
4174 | } | |
4175 | ||
4176 | void | |
4177 | sv_strict_posix (name) | |
4178 | char *name; | |
4179 | { | |
4180 | SET_INT_VAR (name, posixly_correct); | |
4181 | posix_initialize (posixly_correct); | |
4182 | #if defined (READLINE) | |
4183 | if (interactive_shell) | |
4184 | posix_readline_initialize (posixly_correct); | |
4185 | #endif /* READLINE */ | |
4186 | set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */ | |
4187 | } | |
4188 | ||
4189 | void | |
4190 | sv_locale (name) | |
4191 | char *name; | |
4192 | { | |
4193 | char *v; | |
4194 | ||
4195 | v = get_string_value (name); | |
4196 | if (name[0] == 'L' && name[1] == 'A') /* LANG */ | |
4197 | set_lang (name, v); | |
4198 | else | |
4199 | set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */ | |
4200 | } | |
4201 | ||
4202 | #if defined (ARRAY_VARS) | |
4203 | void | |
7117c2d2 | 4204 | set_pipestatus_array (ps, nproc) |
cce855bc | 4205 | int *ps; |
7117c2d2 | 4206 | int nproc; |
cce855bc JA |
4207 | { |
4208 | SHELL_VAR *v; | |
4209 | ARRAY *a; | |
7117c2d2 | 4210 | ARRAY_ELEMENT *ae; |
cce855bc | 4211 | register int i; |
f73dda09 | 4212 | char *t, tbuf[INT_STRLEN_BOUND(int) + 1]; |
cce855bc JA |
4213 | |
4214 | v = find_variable ("PIPESTATUS"); | |
4215 | if (v == 0) | |
4216 | v = make_new_array_variable ("PIPESTATUS"); | |
4217 | if (array_p (v) == 0) | |
4218 | return; /* Do nothing if not an array variable. */ | |
4219 | a = array_cell (v); | |
7117c2d2 JA |
4220 | |
4221 | if (a == 0 || array_num_elements (a) == 0) | |
cce855bc | 4222 | { |
7117c2d2 JA |
4223 | for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */ |
4224 | { | |
4225 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4226 | array_insert (a, i, t); | |
4227 | } | |
4228 | return; | |
4229 | } | |
4230 | ||
4231 | /* Fast case */ | |
4232 | if (array_num_elements (a) == nproc && nproc == 1) | |
4233 | { | |
4234 | ae = element_forw (a->head); | |
4235 | free (element_value (ae)); | |
4236 | ae->value = itos (ps[0]); | |
4237 | } | |
4238 | else if (array_num_elements (a) <= nproc) | |
4239 | { | |
4240 | /* modify in array_num_elements members in place, then add */ | |
4241 | ae = a->head; | |
4242 | for (i = 0; i < array_num_elements (a); i++) | |
4243 | { | |
4244 | ae = element_forw (ae); | |
4245 | free (element_value (ae)); | |
4246 | ae->value = itos (ps[i]); | |
4247 | } | |
4248 | /* add any more */ | |
4249 | for ( ; i < nproc; i++) | |
4250 | { | |
4251 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4252 | array_insert (a, i, t); | |
4253 | } | |
4254 | } | |
4255 | else | |
4256 | { | |
4257 | /* deleting elements. it's faster to rebuild the array. */ | |
4258 | array_flush (a); | |
4259 | for (i = 0; ps[i] != -1; i++) | |
4260 | { | |
4261 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
4262 | array_insert (a, i, t); | |
4263 | } | |
cce855bc JA |
4264 | } |
4265 | } | |
4266 | #endif | |
4267 | ||
4268 | void | |
4269 | set_pipestatus_from_exit (s) | |
4270 | int s; | |
4271 | { | |
4272 | #if defined (ARRAY_VARS) | |
4273 | static int v[2] = { 0, -1 }; | |
4274 | ||
4275 | v[0] = s; | |
7117c2d2 | 4276 | set_pipestatus_array (v, 1); |
cce855bc JA |
4277 | #endif |
4278 | } |