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