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1 | /* variables.c -- Functions for hacking shell variables. */ |
2 | ||
3 | /* Copyright (C) 1987-2012 Free Software Foundation, Inc. | |
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 | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include "config.h" | |
22 | ||
23 | #include "bashtypes.h" | |
24 | #include "posixstat.h" | |
25 | #include "posixtime.h" | |
26 | ||
27 | #if defined (__QNX__) | |
28 | # if defined (__QNXNTO__) | |
29 | # include <sys/netmgr.h> | |
30 | # else | |
31 | # include <sys/vc.h> | |
32 | # endif /* !__QNXNTO__ */ | |
33 | #endif /* __QNX__ */ | |
34 | ||
35 | #if defined (HAVE_UNISTD_H) | |
36 | # include <unistd.h> | |
37 | #endif | |
38 | ||
39 | #include <stdio.h> | |
40 | #include "chartypes.h" | |
41 | #if defined (HAVE_PWD_H) | |
42 | # include <pwd.h> | |
43 | #endif | |
44 | #include "bashansi.h" | |
45 | #include "bashintl.h" | |
46 | ||
47 | #define NEED_XTRACE_SET_DECL | |
48 | ||
49 | #include "shell.h" | |
50 | #include "flags.h" | |
51 | #include "execute_cmd.h" | |
52 | #include "findcmd.h" | |
53 | #include "mailcheck.h" | |
54 | #include "input.h" | |
55 | #include "hashcmd.h" | |
56 | #include "pathexp.h" | |
57 | #include "alias.h" | |
58 | #include "jobs.h" | |
59 | ||
60 | #include "version.h" | |
61 | ||
62 | #include "builtins/getopt.h" | |
63 | #include "builtins/common.h" | |
64 | #include "builtins/builtext.h" | |
65 | ||
66 | #if defined (READLINE) | |
67 | # include "bashline.h" | |
68 | # include <readline/readline.h> | |
69 | #else | |
70 | # include <tilde/tilde.h> | |
71 | #endif | |
72 | ||
73 | #if defined (HISTORY) | |
74 | # include "bashhist.h" | |
75 | # include <readline/history.h> | |
76 | #endif /* HISTORY */ | |
77 | ||
78 | #if defined (PROGRAMMABLE_COMPLETION) | |
79 | # include "pcomplete.h" | |
80 | #endif | |
81 | ||
82 | #define TEMPENV_HASH_BUCKETS 4 /* must be power of two */ | |
83 | ||
84 | #define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0') | |
85 | ||
86 | extern char **environ; | |
87 | ||
88 | /* Variables used here and defined in other files. */ | |
89 | extern int posixly_correct; | |
90 | extern int line_number, line_number_base; | |
91 | extern int subshell_environment, indirection_level, subshell_level; | |
92 | extern int build_version, patch_level; | |
93 | extern int expanding_redir; | |
94 | extern int last_command_exit_value; | |
95 | extern char *dist_version, *release_status; | |
96 | extern char *shell_name; | |
97 | extern char *primary_prompt, *secondary_prompt; | |
98 | extern char *current_host_name; | |
99 | extern sh_builtin_func_t *this_shell_builtin; | |
100 | extern SHELL_VAR *this_shell_function; | |
101 | extern char *the_printed_command_except_trap; | |
102 | extern char *this_command_name; | |
103 | extern char *command_execution_string; | |
104 | extern time_t shell_start_time; | |
105 | extern int assigning_in_environment; | |
106 | extern int executing_builtin; | |
107 | extern int funcnest_max; | |
108 | ||
109 | #if defined (READLINE) | |
110 | extern int no_line_editing; | |
111 | extern int perform_hostname_completion; | |
112 | #endif | |
113 | ||
114 | /* The list of shell variables that the user has created at the global | |
115 | scope, or that came from the environment. */ | |
116 | VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL; | |
117 | ||
118 | /* The current list of shell variables, including function scopes */ | |
119 | VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL; | |
120 | ||
121 | /* The list of shell functions that the user has created, or that came from | |
122 | the environment. */ | |
123 | HASH_TABLE *shell_functions = (HASH_TABLE *)NULL; | |
124 | ||
125 | #if defined (DEBUGGER) | |
126 | /* The table of shell function definitions that the user defined or that | |
127 | came from the environment. */ | |
128 | HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL; | |
129 | #endif | |
130 | ||
131 | /* The current variable context. This is really a count of how deep into | |
132 | executing functions we are. */ | |
133 | int variable_context = 0; | |
134 | ||
135 | /* The set of shell assignments which are made only in the environment | |
136 | for a single command. */ | |
137 | HASH_TABLE *temporary_env = (HASH_TABLE *)NULL; | |
138 | ||
139 | /* Set to non-zero if an assignment error occurs while putting variables | |
140 | into the temporary environment. */ | |
141 | int tempenv_assign_error; | |
142 | ||
143 | /* Some funky variables which are known about specially. Here is where | |
144 | "$*", "$1", and all the cruft is kept. */ | |
145 | char *dollar_vars[10]; | |
146 | WORD_LIST *rest_of_args = (WORD_LIST *)NULL; | |
147 | ||
148 | /* The value of $$. */ | |
149 | pid_t dollar_dollar_pid; | |
150 | ||
151 | /* Non-zero means that we have to remake EXPORT_ENV. */ | |
152 | int array_needs_making = 1; | |
153 | ||
154 | /* The number of times BASH has been executed. This is set | |
155 | by initialize_variables (). */ | |
156 | int shell_level = 0; | |
157 | ||
158 | /* An array which is passed to commands as their environment. It is | |
159 | manufactured from the union of the initial environment and the | |
160 | shell variables that are marked for export. */ | |
161 | char **export_env = (char **)NULL; | |
162 | static int export_env_index; | |
163 | static int export_env_size; | |
164 | ||
165 | #if defined (READLINE) | |
166 | static int winsize_assignment; /* currently assigning to LINES or COLUMNS */ | |
167 | #endif | |
168 | ||
169 | /* Some forward declarations. */ | |
170 | static void create_variable_tables __P((void)); | |
171 | ||
172 | static void set_machine_vars __P((void)); | |
173 | static void set_home_var __P((void)); | |
174 | static void set_shell_var __P((void)); | |
175 | static char *get_bash_name __P((void)); | |
176 | static void initialize_shell_level __P((void)); | |
177 | static void uidset __P((void)); | |
178 | #if defined (ARRAY_VARS) | |
179 | static void make_vers_array __P((void)); | |
180 | #endif | |
181 | ||
182 | static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
183 | #if defined (ARRAY_VARS) | |
184 | static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
185 | #endif | |
186 | static SHELL_VAR *get_self __P((SHELL_VAR *)); | |
187 | ||
188 | #if defined (ARRAY_VARS) | |
189 | static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int)); | |
190 | static SHELL_VAR *init_dynamic_assoc_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int)); | |
191 | #endif | |
192 | ||
193 | static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
194 | static SHELL_VAR *get_seconds __P((SHELL_VAR *)); | |
195 | static SHELL_VAR *init_seconds_var __P((void)); | |
196 | ||
197 | static int brand __P((void)); | |
198 | static void sbrand __P((unsigned long)); /* set bash random number generator. */ | |
199 | static void seedrand __P((void)); /* seed generator randomly */ | |
200 | static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
201 | static SHELL_VAR *get_random __P((SHELL_VAR *)); | |
202 | ||
203 | static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
204 | static SHELL_VAR *get_lineno __P((SHELL_VAR *)); | |
205 | ||
206 | static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
207 | static SHELL_VAR *get_subshell __P((SHELL_VAR *)); | |
208 | ||
209 | static SHELL_VAR *get_bashpid __P((SHELL_VAR *)); | |
210 | ||
211 | #if defined (HISTORY) | |
212 | static SHELL_VAR *get_histcmd __P((SHELL_VAR *)); | |
213 | #endif | |
214 | ||
215 | #if defined (READLINE) | |
216 | static SHELL_VAR *get_comp_wordbreaks __P((SHELL_VAR *)); | |
217 | static SHELL_VAR *assign_comp_wordbreaks __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
218 | #endif | |
219 | ||
220 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) | |
221 | static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
222 | static SHELL_VAR *get_dirstack __P((SHELL_VAR *)); | |
223 | #endif | |
224 | ||
225 | #if defined (ARRAY_VARS) | |
226 | static SHELL_VAR *get_groupset __P((SHELL_VAR *)); | |
227 | ||
228 | static SHELL_VAR *build_hashcmd __P((SHELL_VAR *)); | |
229 | static SHELL_VAR *get_hashcmd __P((SHELL_VAR *)); | |
230 | static SHELL_VAR *assign_hashcmd __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
231 | # if defined (ALIAS) | |
232 | static SHELL_VAR *build_aliasvar __P((SHELL_VAR *)); | |
233 | static SHELL_VAR *get_aliasvar __P((SHELL_VAR *)); | |
234 | static SHELL_VAR *assign_aliasvar __P((SHELL_VAR *, char *, arrayind_t, char *)); | |
235 | # endif | |
236 | #endif | |
237 | ||
238 | static SHELL_VAR *get_funcname __P((SHELL_VAR *)); | |
239 | static SHELL_VAR *init_funcname_var __P((void)); | |
240 | ||
241 | static void initialize_dynamic_variables __P((void)); | |
242 | ||
243 | static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *)); | |
244 | static SHELL_VAR *new_shell_variable __P((const char *)); | |
245 | static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *)); | |
246 | static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int)); | |
247 | ||
248 | static void dispose_variable_value __P((SHELL_VAR *)); | |
249 | static void free_variable_hash_data __P((PTR_T)); | |
250 | ||
251 | static VARLIST *vlist_alloc __P((int)); | |
252 | static VARLIST *vlist_realloc __P((VARLIST *, int)); | |
253 | static void vlist_add __P((VARLIST *, SHELL_VAR *, int)); | |
254 | ||
255 | static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int)); | |
256 | ||
257 | static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **)); | |
258 | ||
259 | static SHELL_VAR **vapply __P((sh_var_map_func_t *)); | |
260 | static SHELL_VAR **fapply __P((sh_var_map_func_t *)); | |
261 | ||
262 | static int visible_var __P((SHELL_VAR *)); | |
263 | static int visible_and_exported __P((SHELL_VAR *)); | |
264 | static int export_environment_candidate __P((SHELL_VAR *)); | |
265 | static int local_and_exported __P((SHELL_VAR *)); | |
266 | static int variable_in_context __P((SHELL_VAR *)); | |
267 | #if defined (ARRAY_VARS) | |
268 | static int visible_array_vars __P((SHELL_VAR *)); | |
269 | #endif | |
270 | ||
271 | static SHELL_VAR *find_nameref_at_context __P((SHELL_VAR *, VAR_CONTEXT *)); | |
272 | static SHELL_VAR *find_variable_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **)); | |
273 | static SHELL_VAR *find_variable_last_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **)); | |
274 | ||
275 | static SHELL_VAR *bind_tempenv_variable __P((const char *, char *)); | |
276 | static void push_temp_var __P((PTR_T)); | |
277 | static void propagate_temp_var __P((PTR_T)); | |
278 | static void dispose_temporary_env __P((sh_free_func_t *)); | |
279 | ||
280 | static inline char *mk_env_string __P((const char *, const char *)); | |
281 | static char **make_env_array_from_var_list __P((SHELL_VAR **)); | |
282 | static char **make_var_export_array __P((VAR_CONTEXT *)); | |
283 | static char **make_func_export_array __P((void)); | |
284 | static void add_temp_array_to_env __P((char **, int, int)); | |
285 | ||
286 | static int n_shell_variables __P((void)); | |
287 | static int set_context __P((SHELL_VAR *)); | |
288 | ||
289 | static void push_func_var __P((PTR_T)); | |
290 | static void push_exported_var __P((PTR_T)); | |
291 | ||
292 | static inline int find_special_var __P((const char *)); | |
293 | ||
294 | static void | |
295 | create_variable_tables () | |
296 | { | |
297 | if (shell_variables == 0) | |
298 | { | |
299 | shell_variables = global_variables = new_var_context ((char *)NULL, 0); | |
300 | shell_variables->scope = 0; | |
301 | shell_variables->table = hash_create (0); | |
302 | } | |
303 | ||
304 | if (shell_functions == 0) | |
305 | shell_functions = hash_create (0); | |
306 | ||
307 | #if defined (DEBUGGER) | |
308 | if (shell_function_defs == 0) | |
309 | shell_function_defs = hash_create (0); | |
310 | #endif | |
311 | } | |
312 | ||
313 | /* Initialize the shell variables from the current environment. | |
314 | If PRIVMODE is nonzero, don't import functions from ENV or | |
315 | parse $SHELLOPTS. */ | |
316 | void | |
317 | initialize_shell_variables (env, privmode) | |
318 | char **env; | |
319 | int privmode; | |
320 | { | |
321 | char *name, *string, *temp_string; | |
322 | int c, char_index, string_index, string_length, ro; | |
323 | SHELL_VAR *temp_var; | |
324 | ||
325 | create_variable_tables (); | |
326 | ||
327 | for (string_index = 0; string = env[string_index++]; ) | |
328 | { | |
329 | char_index = 0; | |
330 | name = string; | |
331 | while ((c = *string++) && c != '=') | |
332 | ; | |
333 | if (string[-1] == '=') | |
334 | char_index = string - name - 1; | |
335 | ||
336 | /* If there are weird things in the environment, like `=xxx' or a | |
337 | string without an `=', just skip them. */ | |
338 | if (char_index == 0) | |
339 | continue; | |
340 | ||
341 | /* ASSERT(name[char_index] == '=') */ | |
342 | name[char_index] = '\0'; | |
343 | /* Now, name = env variable name, string = env variable value, and | |
344 | char_index == strlen (name) */ | |
345 | ||
346 | temp_var = (SHELL_VAR *)NULL; | |
347 | ||
348 | /* If exported function, define it now. Don't import functions from | |
349 | the environment in privileged mode. */ | |
350 | if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4)) | |
351 | { | |
352 | string_length = strlen (string); | |
353 | temp_string = (char *)xmalloc (3 + string_length + char_index); | |
354 | ||
355 | strcpy (temp_string, name); | |
356 | temp_string[char_index] = ' '; | |
357 | strcpy (temp_string + char_index + 1, string); | |
358 | ||
359 | if (posixly_correct == 0 || legal_identifier (name)) | |
360 | parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST); | |
361 | ||
362 | /* Ancient backwards compatibility. Old versions of bash exported | |
363 | functions like name()=() {...} */ | |
364 | if (name[char_index - 1] == ')' && name[char_index - 2] == '(') | |
365 | name[char_index - 2] = '\0'; | |
366 | ||
367 | if (temp_var = find_function (name)) | |
368 | { | |
369 | VSETATTR (temp_var, (att_exported|att_imported)); | |
370 | array_needs_making = 1; | |
371 | } | |
372 | else | |
373 | { | |
374 | #if 0 | |
375 | if (temp_var = bind_variable (name, string, 0)) | |
376 | { | |
377 | VSETATTR (temp_var, (att_exported | att_imported | att_invisible)); | |
378 | array_needs_making = 1; | |
379 | } | |
380 | #endif | |
381 | last_command_exit_value = 1; | |
382 | report_error (_("error importing function definition for `%s'"), name); | |
383 | } | |
384 | ||
385 | /* ( */ | |
386 | if (name[char_index - 1] == ')' && name[char_index - 2] == '\0') | |
387 | name[char_index - 2] = '('; /* ) */ | |
388 | } | |
389 | #if defined (ARRAY_VARS) | |
390 | # if ARRAY_EXPORT | |
391 | /* Array variables may not yet be exported. */ | |
392 | else if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')') | |
393 | { | |
394 | string_length = 1; | |
395 | temp_string = extract_array_assignment_list (string, &string_length); | |
396 | temp_var = assign_array_from_string (name, temp_string); | |
397 | FREE (temp_string); | |
398 | VSETATTR (temp_var, (att_exported | att_imported)); | |
399 | array_needs_making = 1; | |
400 | } | |
401 | # endif /* ARRAY_EXPORT */ | |
402 | #endif | |
403 | #if 0 | |
404 | else if (legal_identifier (name)) | |
405 | #else | |
406 | else | |
407 | #endif | |
408 | { | |
409 | ro = 0; | |
410 | if (posixly_correct && STREQ (name, "SHELLOPTS")) | |
411 | { | |
412 | temp_var = find_variable ("SHELLOPTS"); | |
413 | ro = temp_var && readonly_p (temp_var); | |
414 | if (temp_var) | |
415 | VUNSETATTR (temp_var, att_readonly); | |
416 | } | |
417 | temp_var = bind_variable (name, string, 0); | |
418 | if (temp_var) | |
419 | { | |
420 | if (legal_identifier (name)) | |
421 | VSETATTR (temp_var, (att_exported | att_imported)); | |
422 | else | |
423 | VSETATTR (temp_var, (att_exported | att_imported | att_invisible)); | |
424 | if (ro) | |
425 | VSETATTR (temp_var, att_readonly); | |
426 | array_needs_making = 1; | |
427 | } | |
428 | } | |
429 | ||
430 | name[char_index] = '='; | |
431 | /* temp_var can be NULL if it was an exported function with a syntax | |
432 | error (a different bug, but it still shouldn't dump core). */ | |
433 | if (temp_var && function_p (temp_var) == 0) /* XXX not yet */ | |
434 | { | |
435 | CACHE_IMPORTSTR (temp_var, name); | |
436 | } | |
437 | } | |
438 | ||
439 | set_pwd (); | |
440 | ||
441 | /* Set up initial value of $_ */ | |
442 | temp_var = set_if_not ("_", dollar_vars[0]); | |
443 | ||
444 | /* Remember this pid. */ | |
445 | dollar_dollar_pid = getpid (); | |
446 | ||
447 | /* Now make our own defaults in case the vars that we think are | |
448 | important are missing. */ | |
449 | temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE); | |
450 | #if 0 | |
451 | set_auto_export (temp_var); /* XXX */ | |
452 | #endif | |
453 | ||
454 | temp_var = set_if_not ("TERM", "dumb"); | |
455 | #if 0 | |
456 | set_auto_export (temp_var); /* XXX */ | |
457 | #endif | |
458 | ||
459 | #if defined (__QNX__) | |
460 | /* set node id -- don't import it from the environment */ | |
461 | { | |
462 | char node_name[22]; | |
463 | # if defined (__QNXNTO__) | |
464 | netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name)); | |
465 | # else | |
466 | qnx_nidtostr (getnid (), node_name, sizeof (node_name)); | |
467 | # endif | |
468 | temp_var = bind_variable ("NODE", node_name, 0); | |
469 | set_auto_export (temp_var); | |
470 | } | |
471 | #endif | |
472 | ||
473 | /* set up the prompts. */ | |
474 | if (interactive_shell) | |
475 | { | |
476 | #if defined (PROMPT_STRING_DECODE) | |
477 | set_if_not ("PS1", primary_prompt); | |
478 | #else | |
479 | if (current_user.uid == -1) | |
480 | get_current_user_info (); | |
481 | set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt); | |
482 | #endif | |
483 | set_if_not ("PS2", secondary_prompt); | |
484 | } | |
485 | set_if_not ("PS4", "+ "); | |
486 | ||
487 | /* Don't allow IFS to be imported from the environment. */ | |
488 | temp_var = bind_variable ("IFS", " \t\n", 0); | |
489 | setifs (temp_var); | |
490 | ||
491 | /* Magic machine types. Pretty convenient. */ | |
492 | set_machine_vars (); | |
493 | ||
494 | /* Default MAILCHECK for interactive shells. Defer the creation of a | |
495 | default MAILPATH until the startup files are read, because MAIL | |
496 | names a mail file if MAILPATH is not set, and we should provide a | |
497 | default only if neither is set. */ | |
498 | if (interactive_shell) | |
499 | { | |
500 | temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60"); | |
501 | VSETATTR (temp_var, att_integer); | |
502 | } | |
503 | ||
504 | /* Do some things with shell level. */ | |
505 | initialize_shell_level (); | |
506 | ||
507 | set_ppid (); | |
508 | ||
509 | /* Initialize the `getopts' stuff. */ | |
510 | temp_var = bind_variable ("OPTIND", "1", 0); | |
511 | VSETATTR (temp_var, att_integer); | |
512 | getopts_reset (0); | |
513 | bind_variable ("OPTERR", "1", 0); | |
514 | sh_opterr = 1; | |
515 | ||
516 | if (login_shell == 1 && posixly_correct == 0) | |
517 | set_home_var (); | |
518 | ||
519 | /* Get the full pathname to THIS shell, and set the BASH variable | |
520 | to it. */ | |
521 | name = get_bash_name (); | |
522 | temp_var = bind_variable ("BASH", name, 0); | |
523 | free (name); | |
524 | ||
525 | /* Make the exported environment variable SHELL be the user's login | |
526 | shell. Note that the `tset' command looks at this variable | |
527 | to determine what style of commands to output; if it ends in "csh", | |
528 | then C-shell commands are output, else Bourne shell commands. */ | |
529 | set_shell_var (); | |
530 | ||
531 | /* Make a variable called BASH_VERSION which contains the version info. */ | |
532 | bind_variable ("BASH_VERSION", shell_version_string (), 0); | |
533 | #if defined (ARRAY_VARS) | |
534 | make_vers_array (); | |
535 | #endif | |
536 | ||
537 | if (command_execution_string) | |
538 | bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0); | |
539 | ||
540 | /* Find out if we're supposed to be in Posix.2 mode via an | |
541 | environment variable. */ | |
542 | temp_var = find_variable ("POSIXLY_CORRECT"); | |
543 | if (!temp_var) | |
544 | temp_var = find_variable ("POSIX_PEDANTIC"); | |
545 | if (temp_var && imported_p (temp_var)) | |
546 | sv_strict_posix (temp_var->name); | |
547 | ||
548 | #if defined (HISTORY) | |
549 | /* Set history variables to defaults, and then do whatever we would | |
550 | do if the variable had just been set. Do this only in the case | |
551 | that we are remembering commands on the history list. */ | |
552 | if (remember_on_history) | |
553 | { | |
554 | name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0); | |
555 | ||
556 | set_if_not ("HISTFILE", name); | |
557 | free (name); | |
558 | } | |
559 | #endif /* HISTORY */ | |
560 | ||
561 | /* Seed the random number generator. */ | |
562 | seedrand (); | |
563 | ||
564 | /* Handle some "special" variables that we may have inherited from a | |
565 | parent shell. */ | |
566 | if (interactive_shell) | |
567 | { | |
568 | temp_var = find_variable ("IGNOREEOF"); | |
569 | if (!temp_var) | |
570 | temp_var = find_variable ("ignoreeof"); | |
571 | if (temp_var && imported_p (temp_var)) | |
572 | sv_ignoreeof (temp_var->name); | |
573 | } | |
574 | ||
575 | #if defined (HISTORY) | |
576 | if (interactive_shell && remember_on_history) | |
577 | { | |
578 | sv_history_control ("HISTCONTROL"); | |
579 | sv_histignore ("HISTIGNORE"); | |
580 | sv_histtimefmt ("HISTTIMEFORMAT"); | |
581 | } | |
582 | #endif /* HISTORY */ | |
583 | ||
584 | #if defined (READLINE) && defined (STRICT_POSIX) | |
585 | /* POSIXLY_CORRECT will only be 1 here if the shell was compiled | |
586 | -DSTRICT_POSIX */ | |
587 | if (interactive_shell && posixly_correct && no_line_editing == 0) | |
588 | rl_prefer_env_winsize = 1; | |
589 | #endif /* READLINE && STRICT_POSIX */ | |
590 | ||
591 | /* | |
592 | * 24 October 2001 | |
593 | * | |
594 | * I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT | |
595 | * and SSH2_CLIENT alone. I'm going to rely on the shell_level check in | |
596 | * isnetconn() to avoid running the startup files more often than wanted. | |
597 | * That will, of course, only work if the user's login shell is bash, so | |
598 | * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined | |
599 | * in config-top.h. | |
600 | */ | |
601 | #if 0 | |
602 | temp_var = find_variable ("SSH_CLIENT"); | |
603 | if (temp_var && imported_p (temp_var)) | |
604 | { | |
605 | VUNSETATTR (temp_var, att_exported); | |
606 | array_needs_making = 1; | |
607 | } | |
608 | temp_var = find_variable ("SSH2_CLIENT"); | |
609 | if (temp_var && imported_p (temp_var)) | |
610 | { | |
611 | VUNSETATTR (temp_var, att_exported); | |
612 | array_needs_making = 1; | |
613 | } | |
614 | #endif | |
615 | ||
616 | /* Get the user's real and effective user ids. */ | |
617 | uidset (); | |
618 | ||
619 | temp_var = find_variable ("BASH_XTRACEFD"); | |
620 | if (temp_var && imported_p (temp_var)) | |
621 | sv_xtracefd (temp_var->name); | |
622 | ||
623 | /* Initialize the dynamic variables, and seed their values. */ | |
624 | initialize_dynamic_variables (); | |
625 | } | |
626 | ||
627 | /* **************************************************************** */ | |
628 | /* */ | |
629 | /* Setting values for special shell variables */ | |
630 | /* */ | |
631 | /* **************************************************************** */ | |
632 | ||
633 | static void | |
634 | set_machine_vars () | |
635 | { | |
636 | SHELL_VAR *temp_var; | |
637 | ||
638 | temp_var = set_if_not ("HOSTTYPE", HOSTTYPE); | |
639 | temp_var = set_if_not ("OSTYPE", OSTYPE); | |
640 | temp_var = set_if_not ("MACHTYPE", MACHTYPE); | |
641 | ||
642 | temp_var = set_if_not ("HOSTNAME", current_host_name); | |
643 | } | |
644 | ||
645 | /* Set $HOME to the information in the password file if we didn't get | |
646 | it from the environment. */ | |
647 | ||
648 | /* This function is not static so the tilde and readline libraries can | |
649 | use it. */ | |
650 | char * | |
651 | sh_get_home_dir () | |
652 | { | |
653 | if (current_user.home_dir == 0) | |
654 | get_current_user_info (); | |
655 | return current_user.home_dir; | |
656 | } | |
657 | ||
658 | static void | |
659 | set_home_var () | |
660 | { | |
661 | SHELL_VAR *temp_var; | |
662 | ||
663 | temp_var = find_variable ("HOME"); | |
664 | if (temp_var == 0) | |
665 | temp_var = bind_variable ("HOME", sh_get_home_dir (), 0); | |
666 | #if 0 | |
667 | VSETATTR (temp_var, att_exported); | |
668 | #endif | |
669 | } | |
670 | ||
671 | /* Set $SHELL to the user's login shell if it is not already set. Call | |
672 | get_current_user_info if we haven't already fetched the shell. */ | |
673 | static void | |
674 | set_shell_var () | |
675 | { | |
676 | SHELL_VAR *temp_var; | |
677 | ||
678 | temp_var = find_variable ("SHELL"); | |
679 | if (temp_var == 0) | |
680 | { | |
681 | if (current_user.shell == 0) | |
682 | get_current_user_info (); | |
683 | temp_var = bind_variable ("SHELL", current_user.shell, 0); | |
684 | } | |
685 | #if 0 | |
686 | VSETATTR (temp_var, att_exported); | |
687 | #endif | |
688 | } | |
689 | ||
690 | static char * | |
691 | get_bash_name () | |
692 | { | |
693 | char *name; | |
694 | ||
695 | if ((login_shell == 1) && RELPATH(shell_name)) | |
696 | { | |
697 | if (current_user.shell == 0) | |
698 | get_current_user_info (); | |
699 | name = savestring (current_user.shell); | |
700 | } | |
701 | else if (ABSPATH(shell_name)) | |
702 | name = savestring (shell_name); | |
703 | else if (shell_name[0] == '.' && shell_name[1] == '/') | |
704 | { | |
705 | /* Fast path for common case. */ | |
706 | char *cdir; | |
707 | int len; | |
708 | ||
709 | cdir = get_string_value ("PWD"); | |
710 | if (cdir) | |
711 | { | |
712 | len = strlen (cdir); | |
713 | name = (char *)xmalloc (len + strlen (shell_name) + 1); | |
714 | strcpy (name, cdir); | |
715 | strcpy (name + len, shell_name + 1); | |
716 | } | |
717 | else | |
718 | name = savestring (shell_name); | |
719 | } | |
720 | else | |
721 | { | |
722 | char *tname; | |
723 | int s; | |
724 | ||
725 | tname = find_user_command (shell_name); | |
726 | ||
727 | if (tname == 0) | |
728 | { | |
729 | /* Try the current directory. If there is not an executable | |
730 | there, just punt and use the login shell. */ | |
731 | s = file_status (shell_name); | |
732 | if (s & FS_EXECABLE) | |
733 | { | |
734 | tname = make_absolute (shell_name, get_string_value ("PWD")); | |
735 | if (*shell_name == '.') | |
736 | { | |
737 | name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS); | |
738 | if (name == 0) | |
739 | name = tname; | |
740 | else | |
741 | free (tname); | |
742 | } | |
743 | else | |
744 | name = tname; | |
745 | } | |
746 | else | |
747 | { | |
748 | if (current_user.shell == 0) | |
749 | get_current_user_info (); | |
750 | name = savestring (current_user.shell); | |
751 | } | |
752 | } | |
753 | else | |
754 | { | |
755 | name = full_pathname (tname); | |
756 | free (tname); | |
757 | } | |
758 | } | |
759 | ||
760 | return (name); | |
761 | } | |
762 | ||
763 | void | |
764 | adjust_shell_level (change) | |
765 | int change; | |
766 | { | |
767 | char new_level[5], *old_SHLVL; | |
768 | intmax_t old_level; | |
769 | SHELL_VAR *temp_var; | |
770 | ||
771 | old_SHLVL = get_string_value ("SHLVL"); | |
772 | if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0) | |
773 | old_level = 0; | |
774 | ||
775 | shell_level = old_level + change; | |
776 | if (shell_level < 0) | |
777 | shell_level = 0; | |
778 | else if (shell_level > 1000) | |
779 | { | |
780 | internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level); | |
781 | shell_level = 1; | |
782 | } | |
783 | ||
784 | /* We don't need the full generality of itos here. */ | |
785 | if (shell_level < 10) | |
786 | { | |
787 | new_level[0] = shell_level + '0'; | |
788 | new_level[1] = '\0'; | |
789 | } | |
790 | else if (shell_level < 100) | |
791 | { | |
792 | new_level[0] = (shell_level / 10) + '0'; | |
793 | new_level[1] = (shell_level % 10) + '0'; | |
794 | new_level[2] = '\0'; | |
795 | } | |
796 | else if (shell_level < 1000) | |
797 | { | |
798 | new_level[0] = (shell_level / 100) + '0'; | |
799 | old_level = shell_level % 100; | |
800 | new_level[1] = (old_level / 10) + '0'; | |
801 | new_level[2] = (old_level % 10) + '0'; | |
802 | new_level[3] = '\0'; | |
803 | } | |
804 | ||
805 | temp_var = bind_variable ("SHLVL", new_level, 0); | |
806 | set_auto_export (temp_var); | |
807 | } | |
808 | ||
809 | static void | |
810 | initialize_shell_level () | |
811 | { | |
812 | adjust_shell_level (1); | |
813 | } | |
814 | ||
815 | /* If we got PWD from the environment, update our idea of the current | |
816 | working directory. In any case, make sure that PWD exists before | |
817 | checking it. It is possible for getcwd () to fail on shell startup, | |
818 | and in that case, PWD would be undefined. If this is an interactive | |
819 | login shell, see if $HOME is the current working directory, and if | |
820 | that's not the same string as $PWD, set PWD=$HOME. */ | |
821 | ||
822 | void | |
823 | set_pwd () | |
824 | { | |
825 | SHELL_VAR *temp_var, *home_var; | |
826 | char *temp_string, *home_string; | |
827 | ||
828 | home_var = find_variable ("HOME"); | |
829 | home_string = home_var ? value_cell (home_var) : (char *)NULL; | |
830 | ||
831 | temp_var = find_variable ("PWD"); | |
832 | if (temp_var && imported_p (temp_var) && | |
833 | (temp_string = value_cell (temp_var)) && | |
834 | same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
835 | set_working_directory (temp_string); | |
836 | else if (home_string && interactive_shell && login_shell && | |
837 | same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL)) | |
838 | { | |
839 | set_working_directory (home_string); | |
840 | temp_var = bind_variable ("PWD", home_string, 0); | |
841 | set_auto_export (temp_var); | |
842 | } | |
843 | else | |
844 | { | |
845 | temp_string = get_working_directory ("shell-init"); | |
846 | if (temp_string) | |
847 | { | |
848 | temp_var = bind_variable ("PWD", temp_string, 0); | |
849 | set_auto_export (temp_var); | |
850 | free (temp_string); | |
851 | } | |
852 | } | |
853 | ||
854 | /* According to the Single Unix Specification, v2, $OLDPWD is an | |
855 | `environment variable' and therefore should be auto-exported. | |
856 | Make a dummy invisible variable for OLDPWD, and mark it as exported. */ | |
857 | temp_var = bind_variable ("OLDPWD", (char *)NULL, 0); | |
858 | VSETATTR (temp_var, (att_exported | att_invisible)); | |
859 | } | |
860 | ||
861 | /* Make a variable $PPID, which holds the pid of the shell's parent. */ | |
862 | void | |
863 | set_ppid () | |
864 | { | |
865 | char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name; | |
866 | SHELL_VAR *temp_var; | |
867 | ||
868 | name = inttostr (getppid (), namebuf, sizeof(namebuf)); | |
869 | temp_var = find_variable ("PPID"); | |
870 | if (temp_var) | |
871 | VUNSETATTR (temp_var, (att_readonly | att_exported)); | |
872 | temp_var = bind_variable ("PPID", name, 0); | |
873 | VSETATTR (temp_var, (att_readonly | att_integer)); | |
874 | } | |
875 | ||
876 | static void | |
877 | uidset () | |
878 | { | |
879 | char buff[INT_STRLEN_BOUND(uid_t) + 1], *b; | |
880 | register SHELL_VAR *v; | |
881 | ||
882 | b = inttostr (current_user.uid, buff, sizeof (buff)); | |
883 | v = find_variable ("UID"); | |
884 | if (v == 0) | |
885 | { | |
886 | v = bind_variable ("UID", b, 0); | |
887 | VSETATTR (v, (att_readonly | att_integer)); | |
888 | } | |
889 | ||
890 | if (current_user.euid != current_user.uid) | |
891 | b = inttostr (current_user.euid, buff, sizeof (buff)); | |
892 | ||
893 | v = find_variable ("EUID"); | |
894 | if (v == 0) | |
895 | { | |
896 | v = bind_variable ("EUID", b, 0); | |
897 | VSETATTR (v, (att_readonly | att_integer)); | |
898 | } | |
899 | } | |
900 | ||
901 | #if defined (ARRAY_VARS) | |
902 | static void | |
903 | make_vers_array () | |
904 | { | |
905 | SHELL_VAR *vv; | |
906 | ARRAY *av; | |
907 | char *s, d[32], b[INT_STRLEN_BOUND(int) + 1]; | |
908 | ||
909 | unbind_variable ("BASH_VERSINFO"); | |
910 | ||
911 | vv = make_new_array_variable ("BASH_VERSINFO"); | |
912 | av = array_cell (vv); | |
913 | strcpy (d, dist_version); | |
914 | s = strchr (d, '.'); | |
915 | if (s) | |
916 | *s++ = '\0'; | |
917 | array_insert (av, 0, d); | |
918 | array_insert (av, 1, s); | |
919 | s = inttostr (patch_level, b, sizeof (b)); | |
920 | array_insert (av, 2, s); | |
921 | s = inttostr (build_version, b, sizeof (b)); | |
922 | array_insert (av, 3, s); | |
923 | array_insert (av, 4, release_status); | |
924 | array_insert (av, 5, MACHTYPE); | |
925 | ||
926 | VSETATTR (vv, att_readonly); | |
927 | } | |
928 | #endif /* ARRAY_VARS */ | |
929 | ||
930 | /* Set the environment variables $LINES and $COLUMNS in response to | |
931 | a window size change. */ | |
932 | void | |
933 | sh_set_lines_and_columns (lines, cols) | |
934 | int lines, cols; | |
935 | { | |
936 | char val[INT_STRLEN_BOUND(int) + 1], *v; | |
937 | ||
938 | #if defined (READLINE) | |
939 | /* If we are currently assigning to LINES or COLUMNS, don't do anything. */ | |
940 | if (winsize_assignment) | |
941 | return; | |
942 | #endif | |
943 | ||
944 | v = inttostr (lines, val, sizeof (val)); | |
945 | bind_variable ("LINES", v, 0); | |
946 | ||
947 | v = inttostr (cols, val, sizeof (val)); | |
948 | bind_variable ("COLUMNS", v, 0); | |
949 | } | |
950 | ||
951 | /* **************************************************************** */ | |
952 | /* */ | |
953 | /* Printing variables and values */ | |
954 | /* */ | |
955 | /* **************************************************************** */ | |
956 | ||
957 | /* Print LIST (a list of shell variables) to stdout in such a way that | |
958 | they can be read back in. */ | |
959 | void | |
960 | print_var_list (list) | |
961 | register SHELL_VAR **list; | |
962 | { | |
963 | register int i; | |
964 | register SHELL_VAR *var; | |
965 | ||
966 | for (i = 0; list && (var = list[i]); i++) | |
967 | if (invisible_p (var) == 0) | |
968 | print_assignment (var); | |
969 | } | |
970 | ||
971 | /* Print LIST (a list of shell functions) to stdout in such a way that | |
972 | they can be read back in. */ | |
973 | void | |
974 | print_func_list (list) | |
975 | register SHELL_VAR **list; | |
976 | { | |
977 | register int i; | |
978 | register SHELL_VAR *var; | |
979 | ||
980 | for (i = 0; list && (var = list[i]); i++) | |
981 | { | |
982 | printf ("%s ", var->name); | |
983 | print_var_function (var); | |
984 | printf ("\n"); | |
985 | } | |
986 | } | |
987 | ||
988 | /* Print the value of a single SHELL_VAR. No newline is | |
989 | output, but the variable is printed in such a way that | |
990 | it can be read back in. */ | |
991 | void | |
992 | print_assignment (var) | |
993 | SHELL_VAR *var; | |
994 | { | |
995 | if (var_isset (var) == 0) | |
996 | return; | |
997 | ||
998 | if (function_p (var)) | |
999 | { | |
1000 | printf ("%s", var->name); | |
1001 | print_var_function (var); | |
1002 | printf ("\n"); | |
1003 | } | |
1004 | #if defined (ARRAY_VARS) | |
1005 | else if (array_p (var)) | |
1006 | print_array_assignment (var, 0); | |
1007 | else if (assoc_p (var)) | |
1008 | print_assoc_assignment (var, 0); | |
1009 | #endif /* ARRAY_VARS */ | |
1010 | else | |
1011 | { | |
1012 | printf ("%s=", var->name); | |
1013 | print_var_value (var, 1); | |
1014 | printf ("\n"); | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | /* Print the value cell of VAR, a shell variable. Do not print | |
1019 | the name, nor leading/trailing newline. If QUOTE is non-zero, | |
1020 | and the value contains shell metacharacters, quote the value | |
1021 | in such a way that it can be read back in. */ | |
1022 | void | |
1023 | print_var_value (var, quote) | |
1024 | SHELL_VAR *var; | |
1025 | int quote; | |
1026 | { | |
1027 | char *t; | |
1028 | ||
1029 | if (var_isset (var) == 0) | |
1030 | return; | |
1031 | ||
1032 | if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var))) | |
1033 | { | |
1034 | t = ansic_quote (value_cell (var), 0, (int *)0); | |
1035 | printf ("%s", t); | |
1036 | free (t); | |
1037 | } | |
1038 | else if (quote && sh_contains_shell_metas (value_cell (var))) | |
1039 | { | |
1040 | t = sh_single_quote (value_cell (var)); | |
1041 | printf ("%s", t); | |
1042 | free (t); | |
1043 | } | |
1044 | else | |
1045 | printf ("%s", value_cell (var)); | |
1046 | } | |
1047 | ||
1048 | /* Print the function cell of VAR, a shell variable. Do not | |
1049 | print the name, nor leading/trailing newline. */ | |
1050 | void | |
1051 | print_var_function (var) | |
1052 | SHELL_VAR *var; | |
1053 | { | |
1054 | char *x; | |
1055 | ||
1056 | if (function_p (var) && var_isset (var)) | |
1057 | { | |
1058 | x = named_function_string ((char *)NULL, function_cell(var), FUNC_MULTILINE|FUNC_EXTERNAL); | |
1059 | printf ("%s", x); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /* **************************************************************** */ | |
1064 | /* */ | |
1065 | /* Dynamic Variables */ | |
1066 | /* */ | |
1067 | /* **************************************************************** */ | |
1068 | ||
1069 | /* DYNAMIC VARIABLES | |
1070 | ||
1071 | These are variables whose values are generated anew each time they are | |
1072 | referenced. These are implemented using a pair of function pointers | |
1073 | in the struct variable: assign_func, which is called from bind_variable | |
1074 | and, if arrays are compiled into the shell, some of the functions in | |
1075 | arrayfunc.c, and dynamic_value, which is called from find_variable. | |
1076 | ||
1077 | assign_func is called from bind_variable_internal, if | |
1078 | bind_variable_internal discovers that the variable being assigned to | |
1079 | has such a function. The function is called as | |
1080 | SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind) | |
1081 | and the (SHELL_VAR *)temp is returned as the value of bind_variable. It | |
1082 | is usually ENTRY (self). IND is an index for an array variable, and | |
1083 | unused otherwise. | |
1084 | ||
1085 | dynamic_value is called from find_variable_internal to return a `new' | |
1086 | value for the specified dynamic varible. If this function is NULL, | |
1087 | the variable is treated as a `normal' shell variable. If it is not, | |
1088 | however, then this function is called like this: | |
1089 | tempvar = (*(var->dynamic_value)) (var); | |
1090 | ||
1091 | Sometimes `tempvar' will replace the value of `var'. Other times, the | |
1092 | shell will simply use the string value. Pretty object-oriented, huh? | |
1093 | ||
1094 | Be warned, though: if you `unset' a special variable, it loses its | |
1095 | special meaning, even if you subsequently set it. | |
1096 | ||
1097 | The special assignment code would probably have been better put in | |
1098 | subst.c: do_assignment_internal, in the same style as | |
1099 | stupidly_hack_special_variables, but I wanted the changes as | |
1100 | localized as possible. */ | |
1101 | ||
1102 | #define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \ | |
1103 | do \ | |
1104 | { \ | |
1105 | v = bind_variable (var, (val), 0); \ | |
1106 | v->dynamic_value = gfunc; \ | |
1107 | v->assign_func = afunc; \ | |
1108 | } \ | |
1109 | while (0) | |
1110 | ||
1111 | #define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \ | |
1112 | do \ | |
1113 | { \ | |
1114 | v = make_new_array_variable (var); \ | |
1115 | v->dynamic_value = gfunc; \ | |
1116 | v->assign_func = afunc; \ | |
1117 | } \ | |
1118 | while (0) | |
1119 | ||
1120 | #define INIT_DYNAMIC_ASSOC_VAR(var, gfunc, afunc) \ | |
1121 | do \ | |
1122 | { \ | |
1123 | v = make_new_assoc_variable (var); \ | |
1124 | v->dynamic_value = gfunc; \ | |
1125 | v->assign_func = afunc; \ | |
1126 | } \ | |
1127 | while (0) | |
1128 | ||
1129 | static SHELL_VAR * | |
1130 | null_assign (self, value, unused, key) | |
1131 | SHELL_VAR *self; | |
1132 | char *value; | |
1133 | arrayind_t unused; | |
1134 | char *key; | |
1135 | { | |
1136 | return (self); | |
1137 | } | |
1138 | ||
1139 | #if defined (ARRAY_VARS) | |
1140 | static SHELL_VAR * | |
1141 | null_array_assign (self, value, ind, key) | |
1142 | SHELL_VAR *self; | |
1143 | char *value; | |
1144 | arrayind_t ind; | |
1145 | char *key; | |
1146 | { | |
1147 | return (self); | |
1148 | } | |
1149 | #endif | |
1150 | ||
1151 | /* Degenerate `dynamic_value' function; just returns what's passed without | |
1152 | manipulation. */ | |
1153 | static SHELL_VAR * | |
1154 | get_self (self) | |
1155 | SHELL_VAR *self; | |
1156 | { | |
1157 | return (self); | |
1158 | } | |
1159 | ||
1160 | #if defined (ARRAY_VARS) | |
1161 | /* A generic dynamic array variable initializer. Intialize array variable | |
1162 | NAME with dynamic value function GETFUNC and assignment function SETFUNC. */ | |
1163 | static SHELL_VAR * | |
1164 | init_dynamic_array_var (name, getfunc, setfunc, attrs) | |
1165 | char *name; | |
1166 | sh_var_value_func_t *getfunc; | |
1167 | sh_var_assign_func_t *setfunc; | |
1168 | int attrs; | |
1169 | { | |
1170 | SHELL_VAR *v; | |
1171 | ||
1172 | v = find_variable (name); | |
1173 | if (v) | |
1174 | return (v); | |
1175 | INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc); | |
1176 | if (attrs) | |
1177 | VSETATTR (v, attrs); | |
1178 | return v; | |
1179 | } | |
1180 | ||
1181 | static SHELL_VAR * | |
1182 | init_dynamic_assoc_var (name, getfunc, setfunc, attrs) | |
1183 | char *name; | |
1184 | sh_var_value_func_t *getfunc; | |
1185 | sh_var_assign_func_t *setfunc; | |
1186 | int attrs; | |
1187 | { | |
1188 | SHELL_VAR *v; | |
1189 | ||
1190 | v = find_variable (name); | |
1191 | if (v) | |
1192 | return (v); | |
1193 | INIT_DYNAMIC_ASSOC_VAR (name, getfunc, setfunc); | |
1194 | if (attrs) | |
1195 | VSETATTR (v, attrs); | |
1196 | return v; | |
1197 | } | |
1198 | #endif | |
1199 | ||
1200 | /* The value of $SECONDS. This is the number of seconds since shell | |
1201 | invocation, or, the number of seconds since the last assignment + the | |
1202 | value of the last assignment. */ | |
1203 | static intmax_t seconds_value_assigned; | |
1204 | ||
1205 | static SHELL_VAR * | |
1206 | assign_seconds (self, value, unused, key) | |
1207 | SHELL_VAR *self; | |
1208 | char *value; | |
1209 | arrayind_t unused; | |
1210 | char *key; | |
1211 | { | |
1212 | if (legal_number (value, &seconds_value_assigned) == 0) | |
1213 | seconds_value_assigned = 0; | |
1214 | shell_start_time = NOW; | |
1215 | return (self); | |
1216 | } | |
1217 | ||
1218 | static SHELL_VAR * | |
1219 | get_seconds (var) | |
1220 | SHELL_VAR *var; | |
1221 | { | |
1222 | time_t time_since_start; | |
1223 | char *p; | |
1224 | ||
1225 | time_since_start = NOW - shell_start_time; | |
1226 | p = itos(seconds_value_assigned + time_since_start); | |
1227 | ||
1228 | FREE (value_cell (var)); | |
1229 | ||
1230 | VSETATTR (var, att_integer); | |
1231 | var_setvalue (var, p); | |
1232 | return (var); | |
1233 | } | |
1234 | ||
1235 | static SHELL_VAR * | |
1236 | init_seconds_var () | |
1237 | { | |
1238 | SHELL_VAR *v; | |
1239 | ||
1240 | v = find_variable ("SECONDS"); | |
1241 | if (v) | |
1242 | { | |
1243 | if (legal_number (value_cell(v), &seconds_value_assigned) == 0) | |
1244 | seconds_value_assigned = 0; | |
1245 | } | |
1246 | INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds); | |
1247 | return v; | |
1248 | } | |
1249 | ||
1250 | /* The random number seed. You can change this by setting RANDOM. */ | |
1251 | static unsigned long rseed = 1; | |
1252 | static int last_random_value; | |
1253 | static int seeded_subshell = 0; | |
1254 | ||
1255 | /* A linear congruential random number generator based on the example | |
1256 | one in the ANSI C standard. This one isn't very good, but a more | |
1257 | complicated one is overkill. */ | |
1258 | ||
1259 | /* Returns a pseudo-random number between 0 and 32767. */ | |
1260 | static int | |
1261 | brand () | |
1262 | { | |
1263 | /* From "Random number generators: good ones are hard to find", | |
1264 | Park and Miller, Communications of the ACM, vol. 31, no. 10, | |
1265 | October 1988, p. 1195. filtered through FreeBSD */ | |
1266 | long h, l; | |
1267 | ||
1268 | /* Can't seed with 0. */ | |
1269 | if (rseed == 0) | |
1270 | rseed = 123459876; | |
1271 | h = rseed / 127773; | |
1272 | l = rseed % 127773; | |
1273 | rseed = 16807 * l - 2836 * h; | |
1274 | #if 0 | |
1275 | if (rseed < 0) | |
1276 | rseed += 0x7fffffff; | |
1277 | #endif | |
1278 | return ((unsigned int)(rseed & 32767)); /* was % 32768 */ | |
1279 | } | |
1280 | ||
1281 | /* Set the random number generator seed to SEED. */ | |
1282 | static void | |
1283 | sbrand (seed) | |
1284 | unsigned long seed; | |
1285 | { | |
1286 | rseed = seed; | |
1287 | last_random_value = 0; | |
1288 | } | |
1289 | ||
1290 | static void | |
1291 | seedrand () | |
1292 | { | |
1293 | struct timeval tv; | |
1294 | ||
1295 | gettimeofday (&tv, NULL); | |
1296 | sbrand (tv.tv_sec ^ tv.tv_usec ^ getpid ()); | |
1297 | } | |
1298 | ||
1299 | static SHELL_VAR * | |
1300 | assign_random (self, value, unused, key) | |
1301 | SHELL_VAR *self; | |
1302 | char *value; | |
1303 | arrayind_t unused; | |
1304 | char *key; | |
1305 | { | |
1306 | sbrand (strtoul (value, (char **)NULL, 10)); | |
1307 | if (subshell_environment) | |
1308 | seeded_subshell = getpid (); | |
1309 | return (self); | |
1310 | } | |
1311 | ||
1312 | int | |
1313 | get_random_number () | |
1314 | { | |
1315 | int rv, pid; | |
1316 | ||
1317 | /* Reset for command and process substitution. */ | |
1318 | pid = getpid (); | |
1319 | if (subshell_environment && seeded_subshell != pid) | |
1320 | { | |
1321 | seedrand (); | |
1322 | seeded_subshell = pid; | |
1323 | } | |
1324 | ||
1325 | do | |
1326 | rv = brand (); | |
1327 | while (rv == last_random_value); | |
1328 | return rv; | |
1329 | } | |
1330 | ||
1331 | static SHELL_VAR * | |
1332 | get_random (var) | |
1333 | SHELL_VAR *var; | |
1334 | { | |
1335 | int rv; | |
1336 | char *p; | |
1337 | ||
1338 | rv = get_random_number (); | |
1339 | last_random_value = rv; | |
1340 | p = itos (rv); | |
1341 | ||
1342 | FREE (value_cell (var)); | |
1343 | ||
1344 | VSETATTR (var, att_integer); | |
1345 | var_setvalue (var, p); | |
1346 | return (var); | |
1347 | } | |
1348 | ||
1349 | static SHELL_VAR * | |
1350 | assign_lineno (var, value, unused, key) | |
1351 | SHELL_VAR *var; | |
1352 | char *value; | |
1353 | arrayind_t unused; | |
1354 | char *key; | |
1355 | { | |
1356 | intmax_t new_value; | |
1357 | ||
1358 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1359 | new_value = 0; | |
1360 | line_number = line_number_base = new_value; | |
1361 | return var; | |
1362 | } | |
1363 | ||
1364 | /* Function which returns the current line number. */ | |
1365 | static SHELL_VAR * | |
1366 | get_lineno (var) | |
1367 | SHELL_VAR *var; | |
1368 | { | |
1369 | char *p; | |
1370 | int ln; | |
1371 | ||
1372 | ln = executing_line_number (); | |
1373 | p = itos (ln); | |
1374 | FREE (value_cell (var)); | |
1375 | var_setvalue (var, p); | |
1376 | return (var); | |
1377 | } | |
1378 | ||
1379 | static SHELL_VAR * | |
1380 | assign_subshell (var, value, unused, key) | |
1381 | SHELL_VAR *var; | |
1382 | char *value; | |
1383 | arrayind_t unused; | |
1384 | char *key; | |
1385 | { | |
1386 | intmax_t new_value; | |
1387 | ||
1388 | if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0) | |
1389 | new_value = 0; | |
1390 | subshell_level = new_value; | |
1391 | return var; | |
1392 | } | |
1393 | ||
1394 | static SHELL_VAR * | |
1395 | get_subshell (var) | |
1396 | SHELL_VAR *var; | |
1397 | { | |
1398 | char *p; | |
1399 | ||
1400 | p = itos (subshell_level); | |
1401 | FREE (value_cell (var)); | |
1402 | var_setvalue (var, p); | |
1403 | return (var); | |
1404 | } | |
1405 | ||
1406 | static SHELL_VAR * | |
1407 | get_bashpid (var) | |
1408 | SHELL_VAR *var; | |
1409 | { | |
1410 | int pid; | |
1411 | char *p; | |
1412 | ||
1413 | pid = getpid (); | |
1414 | p = itos (pid); | |
1415 | ||
1416 | FREE (value_cell (var)); | |
1417 | VSETATTR (var, att_integer|att_readonly); | |
1418 | var_setvalue (var, p); | |
1419 | return (var); | |
1420 | } | |
1421 | ||
1422 | static SHELL_VAR * | |
1423 | get_bash_command (var) | |
1424 | SHELL_VAR *var; | |
1425 | { | |
1426 | char *p; | |
1427 | ||
1428 | if (the_printed_command_except_trap) | |
1429 | p = savestring (the_printed_command_except_trap); | |
1430 | else | |
1431 | { | |
1432 | p = (char *)xmalloc (1); | |
1433 | p[0] = '\0'; | |
1434 | } | |
1435 | FREE (value_cell (var)); | |
1436 | var_setvalue (var, p); | |
1437 | return (var); | |
1438 | } | |
1439 | ||
1440 | #if defined (HISTORY) | |
1441 | static SHELL_VAR * | |
1442 | get_histcmd (var) | |
1443 | SHELL_VAR *var; | |
1444 | { | |
1445 | char *p; | |
1446 | ||
1447 | p = itos (history_number ()); | |
1448 | FREE (value_cell (var)); | |
1449 | var_setvalue (var, p); | |
1450 | return (var); | |
1451 | } | |
1452 | #endif | |
1453 | ||
1454 | #if defined (READLINE) | |
1455 | /* When this function returns, VAR->value points to malloced memory. */ | |
1456 | static SHELL_VAR * | |
1457 | get_comp_wordbreaks (var) | |
1458 | SHELL_VAR *var; | |
1459 | { | |
1460 | /* If we don't have anything yet, assign a default value. */ | |
1461 | if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0) | |
1462 | enable_hostname_completion (perform_hostname_completion); | |
1463 | ||
1464 | FREE (value_cell (var)); | |
1465 | var_setvalue (var, savestring (rl_completer_word_break_characters)); | |
1466 | ||
1467 | return (var); | |
1468 | } | |
1469 | ||
1470 | /* When this function returns, rl_completer_word_break_characters points to | |
1471 | malloced memory. */ | |
1472 | static SHELL_VAR * | |
1473 | assign_comp_wordbreaks (self, value, unused, key) | |
1474 | SHELL_VAR *self; | |
1475 | char *value; | |
1476 | arrayind_t unused; | |
1477 | char *key; | |
1478 | { | |
1479 | if (rl_completer_word_break_characters && | |
1480 | rl_completer_word_break_characters != rl_basic_word_break_characters) | |
1481 | free (rl_completer_word_break_characters); | |
1482 | ||
1483 | rl_completer_word_break_characters = savestring (value); | |
1484 | return self; | |
1485 | } | |
1486 | #endif /* READLINE */ | |
1487 | ||
1488 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) | |
1489 | static SHELL_VAR * | |
1490 | assign_dirstack (self, value, ind, key) | |
1491 | SHELL_VAR *self; | |
1492 | char *value; | |
1493 | arrayind_t ind; | |
1494 | char *key; | |
1495 | { | |
1496 | set_dirstack_element (ind, 1, value); | |
1497 | return self; | |
1498 | } | |
1499 | ||
1500 | static SHELL_VAR * | |
1501 | get_dirstack (self) | |
1502 | SHELL_VAR *self; | |
1503 | { | |
1504 | ARRAY *a; | |
1505 | WORD_LIST *l; | |
1506 | ||
1507 | l = get_directory_stack (0); | |
1508 | a = array_from_word_list (l); | |
1509 | array_dispose (array_cell (self)); | |
1510 | dispose_words (l); | |
1511 | var_setarray (self, a); | |
1512 | return self; | |
1513 | } | |
1514 | #endif /* PUSHD AND POPD && ARRAY_VARS */ | |
1515 | ||
1516 | #if defined (ARRAY_VARS) | |
1517 | /* We don't want to initialize the group set with a call to getgroups() | |
1518 | unless we're asked to, but we only want to do it once. */ | |
1519 | static SHELL_VAR * | |
1520 | get_groupset (self) | |
1521 | SHELL_VAR *self; | |
1522 | { | |
1523 | register int i; | |
1524 | int ng; | |
1525 | ARRAY *a; | |
1526 | static char **group_set = (char **)NULL; | |
1527 | ||
1528 | if (group_set == 0) | |
1529 | { | |
1530 | group_set = get_group_list (&ng); | |
1531 | a = array_cell (self); | |
1532 | for (i = 0; i < ng; i++) | |
1533 | array_insert (a, i, group_set[i]); | |
1534 | } | |
1535 | return (self); | |
1536 | } | |
1537 | ||
1538 | static SHELL_VAR * | |
1539 | build_hashcmd (self) | |
1540 | SHELL_VAR *self; | |
1541 | { | |
1542 | HASH_TABLE *h; | |
1543 | int i; | |
1544 | char *k, *v; | |
1545 | BUCKET_CONTENTS *item; | |
1546 | ||
1547 | h = assoc_cell (self); | |
1548 | if (h) | |
1549 | assoc_dispose (h); | |
1550 | ||
1551 | if (hashed_filenames == 0 || HASH_ENTRIES (hashed_filenames) == 0) | |
1552 | { | |
1553 | var_setvalue (self, (char *)NULL); | |
1554 | return self; | |
1555 | } | |
1556 | ||
1557 | h = assoc_create (hashed_filenames->nbuckets); | |
1558 | for (i = 0; i < hashed_filenames->nbuckets; i++) | |
1559 | { | |
1560 | for (item = hash_items (i, hashed_filenames); item; item = item->next) | |
1561 | { | |
1562 | k = savestring (item->key); | |
1563 | v = pathdata(item)->path; | |
1564 | assoc_insert (h, k, v); | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | var_setvalue (self, (char *)h); | |
1569 | return self; | |
1570 | } | |
1571 | ||
1572 | static SHELL_VAR * | |
1573 | get_hashcmd (self) | |
1574 | SHELL_VAR *self; | |
1575 | { | |
1576 | build_hashcmd (self); | |
1577 | return (self); | |
1578 | } | |
1579 | ||
1580 | static SHELL_VAR * | |
1581 | assign_hashcmd (self, value, ind, key) | |
1582 | SHELL_VAR *self; | |
1583 | char *value; | |
1584 | arrayind_t ind; | |
1585 | char *key; | |
1586 | { | |
1587 | phash_insert (key, value, 0, 0); | |
1588 | return (build_hashcmd (self)); | |
1589 | } | |
1590 | ||
1591 | #if defined (ALIAS) | |
1592 | static SHELL_VAR * | |
1593 | build_aliasvar (self) | |
1594 | SHELL_VAR *self; | |
1595 | { | |
1596 | HASH_TABLE *h; | |
1597 | int i; | |
1598 | char *k, *v; | |
1599 | BUCKET_CONTENTS *item; | |
1600 | ||
1601 | h = assoc_cell (self); | |
1602 | if (h) | |
1603 | assoc_dispose (h); | |
1604 | ||
1605 | if (aliases == 0 || HASH_ENTRIES (aliases) == 0) | |
1606 | { | |
1607 | var_setvalue (self, (char *)NULL); | |
1608 | return self; | |
1609 | } | |
1610 | ||
1611 | h = assoc_create (aliases->nbuckets); | |
1612 | for (i = 0; i < aliases->nbuckets; i++) | |
1613 | { | |
1614 | for (item = hash_items (i, aliases); item; item = item->next) | |
1615 | { | |
1616 | k = savestring (item->key); | |
1617 | v = ((alias_t *)(item->data))->value; | |
1618 | assoc_insert (h, k, v); | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | var_setvalue (self, (char *)h); | |
1623 | return self; | |
1624 | } | |
1625 | ||
1626 | static SHELL_VAR * | |
1627 | get_aliasvar (self) | |
1628 | SHELL_VAR *self; | |
1629 | { | |
1630 | build_aliasvar (self); | |
1631 | return (self); | |
1632 | } | |
1633 | ||
1634 | static SHELL_VAR * | |
1635 | assign_aliasvar (self, value, ind, key) | |
1636 | SHELL_VAR *self; | |
1637 | char *value; | |
1638 | arrayind_t ind; | |
1639 | char *key; | |
1640 | { | |
1641 | add_alias (key, value); | |
1642 | return (build_aliasvar (self)); | |
1643 | } | |
1644 | #endif /* ALIAS */ | |
1645 | ||
1646 | #endif /* ARRAY_VARS */ | |
1647 | ||
1648 | /* If ARRAY_VARS is not defined, this just returns the name of any | |
1649 | currently-executing function. If we have arrays, it's a call stack. */ | |
1650 | static SHELL_VAR * | |
1651 | get_funcname (self) | |
1652 | SHELL_VAR *self; | |
1653 | { | |
1654 | #if ! defined (ARRAY_VARS) | |
1655 | char *t; | |
1656 | if (variable_context && this_shell_function) | |
1657 | { | |
1658 | FREE (value_cell (self)); | |
1659 | t = savestring (this_shell_function->name); | |
1660 | var_setvalue (self, t); | |
1661 | } | |
1662 | #endif | |
1663 | return (self); | |
1664 | } | |
1665 | ||
1666 | void | |
1667 | make_funcname_visible (on_or_off) | |
1668 | int on_or_off; | |
1669 | { | |
1670 | SHELL_VAR *v; | |
1671 | ||
1672 | v = find_variable ("FUNCNAME"); | |
1673 | if (v == 0 || v->dynamic_value == 0) | |
1674 | return; | |
1675 | ||
1676 | if (on_or_off) | |
1677 | VUNSETATTR (v, att_invisible); | |
1678 | else | |
1679 | VSETATTR (v, att_invisible); | |
1680 | } | |
1681 | ||
1682 | static SHELL_VAR * | |
1683 | init_funcname_var () | |
1684 | { | |
1685 | SHELL_VAR *v; | |
1686 | ||
1687 | v = find_variable ("FUNCNAME"); | |
1688 | if (v) | |
1689 | return v; | |
1690 | #if defined (ARRAY_VARS) | |
1691 | INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign); | |
1692 | #else | |
1693 | INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign); | |
1694 | #endif | |
1695 | VSETATTR (v, att_invisible|att_noassign); | |
1696 | return v; | |
1697 | } | |
1698 | ||
1699 | static void | |
1700 | initialize_dynamic_variables () | |
1701 | { | |
1702 | SHELL_VAR *v; | |
1703 | ||
1704 | v = init_seconds_var (); | |
1705 | ||
1706 | INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL); | |
1707 | INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell); | |
1708 | ||
1709 | INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random); | |
1710 | VSETATTR (v, att_integer); | |
1711 | INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno); | |
1712 | VSETATTR (v, att_integer); | |
1713 | ||
1714 | INIT_DYNAMIC_VAR ("BASHPID", (char *)NULL, get_bashpid, null_assign); | |
1715 | VSETATTR (v, att_integer|att_readonly); | |
1716 | ||
1717 | #if defined (HISTORY) | |
1718 | INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL); | |
1719 | VSETATTR (v, att_integer); | |
1720 | #endif | |
1721 | ||
1722 | #if defined (READLINE) | |
1723 | INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks); | |
1724 | #endif | |
1725 | ||
1726 | #if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS) | |
1727 | v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0); | |
1728 | #endif /* PUSHD_AND_POPD && ARRAY_VARS */ | |
1729 | ||
1730 | #if defined (ARRAY_VARS) | |
1731 | v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign); | |
1732 | ||
1733 | # if defined (DEBUGGER) | |
1734 | v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset); | |
1735 | v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset); | |
1736 | # endif /* DEBUGGER */ | |
1737 | v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset); | |
1738 | v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset); | |
1739 | ||
1740 | v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_nofree); | |
1741 | # if defined (ALIAS) | |
1742 | v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_nofree); | |
1743 | # endif | |
1744 | #endif | |
1745 | ||
1746 | v = init_funcname_var (); | |
1747 | } | |
1748 | ||
1749 | /* **************************************************************** */ | |
1750 | /* */ | |
1751 | /* Retrieving variables and values */ | |
1752 | /* */ | |
1753 | /* **************************************************************** */ | |
1754 | ||
1755 | /* How to get a pointer to the shell variable or function named NAME. | |
1756 | HASHED_VARS is a pointer to the hash table containing the list | |
1757 | of interest (either variables or functions). */ | |
1758 | ||
1759 | static SHELL_VAR * | |
1760 | hash_lookup (name, hashed_vars) | |
1761 | const char *name; | |
1762 | HASH_TABLE *hashed_vars; | |
1763 | { | |
1764 | BUCKET_CONTENTS *bucket; | |
1765 | ||
1766 | bucket = hash_search (name, hashed_vars, 0); | |
1767 | return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL); | |
1768 | } | |
1769 | ||
1770 | SHELL_VAR * | |
1771 | var_lookup (name, vcontext) | |
1772 | const char *name; | |
1773 | VAR_CONTEXT *vcontext; | |
1774 | { | |
1775 | VAR_CONTEXT *vc; | |
1776 | SHELL_VAR *v; | |
1777 | ||
1778 | v = (SHELL_VAR *)NULL; | |
1779 | for (vc = vcontext; vc; vc = vc->down) | |
1780 | if (v = hash_lookup (name, vc->table)) | |
1781 | break; | |
1782 | ||
1783 | return v; | |
1784 | } | |
1785 | ||
1786 | /* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero, | |
1787 | then also search the temporarily built list of exported variables. | |
1788 | The lookup order is: | |
1789 | temporary_env | |
1790 | shell_variables list | |
1791 | */ | |
1792 | ||
1793 | SHELL_VAR * | |
1794 | find_variable_internal (name, force_tempenv) | |
1795 | const char *name; | |
1796 | int force_tempenv; | |
1797 | { | |
1798 | SHELL_VAR *var; | |
1799 | int search_tempenv; | |
1800 | VAR_CONTEXT *vc; | |
1801 | ||
1802 | var = (SHELL_VAR *)NULL; | |
1803 | ||
1804 | /* If explicitly requested, first look in the temporary environment for | |
1805 | the variable. This allows constructs such as "foo=x eval 'echo $foo'" | |
1806 | to get the `exported' value of $foo. This happens if we are executing | |
1807 | a function or builtin, or if we are looking up a variable in a | |
1808 | "subshell environment". */ | |
1809 | search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment); | |
1810 | ||
1811 | if (search_tempenv && temporary_env) | |
1812 | var = hash_lookup (name, temporary_env); | |
1813 | ||
1814 | vc = shell_variables; | |
1815 | #if 0 | |
1816 | if (search_tempenv == 0 && /* (subshell_environment & SUBSHELL_COMSUB) && */ | |
1817 | expanding_redir && | |
1818 | (this_shell_builtin == eval_builtin || this_shell_builtin == command_builtin)) | |
1819 | { | |
1820 | itrace("find_variable_internal: search_tempenv == 0: skipping VC_BLTNENV"); | |
1821 | while (vc && (vc->flags & VC_BLTNENV)) | |
1822 | vc = vc->down; | |
1823 | if (vc == 0) | |
1824 | vc = shell_variables; | |
1825 | } | |
1826 | #endif | |
1827 | ||
1828 | if (var == 0) | |
1829 | var = var_lookup (name, vc); | |
1830 | ||
1831 | if (var == 0) | |
1832 | return ((SHELL_VAR *)NULL); | |
1833 | ||
1834 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); | |
1835 | } | |
1836 | ||
1837 | /* Look up and resolve the chain of nameref variables starting at V all the | |
1838 | way to NULL or non-nameref. */ | |
1839 | SHELL_VAR * | |
1840 | find_variable_nameref (v) | |
1841 | SHELL_VAR *v; | |
1842 | { | |
1843 | int level; | |
1844 | char *newname; | |
1845 | ||
1846 | level = 0; | |
1847 | while (v && nameref_p (v)) | |
1848 | { | |
1849 | level++; | |
1850 | if (level > NAMEREF_MAX) | |
1851 | return ((SHELL_VAR *)0); /* error message here? */ | |
1852 | newname = nameref_cell (v); | |
1853 | if (newname == 0 || *newname == '\0') | |
1854 | return ((SHELL_VAR *)0); | |
1855 | v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin))); | |
1856 | } | |
1857 | return v; | |
1858 | } | |
1859 | ||
1860 | /* Resolve the chain of nameref variables for NAME. XXX - could change later */ | |
1861 | SHELL_VAR * | |
1862 | find_variable_last_nameref (name) | |
1863 | const char *name; | |
1864 | { | |
1865 | SHELL_VAR *v, *nv; | |
1866 | char *newname; | |
1867 | int level; | |
1868 | ||
1869 | nv = v = find_variable_noref (name); | |
1870 | level = 0; | |
1871 | while (v && nameref_p (v)) | |
1872 | { | |
1873 | level++; | |
1874 | if (level > NAMEREF_MAX) | |
1875 | return ((SHELL_VAR *)0); /* error message here? */ | |
1876 | newname = nameref_cell (v); | |
1877 | if (newname == 0 || *newname == '\0') | |
1878 | return ((SHELL_VAR *)0); | |
1879 | nv = v; | |
1880 | v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin))); | |
1881 | } | |
1882 | return nv; | |
1883 | } | |
1884 | ||
1885 | /* Resolve the chain of nameref variables for NAME. XXX - could change later */ | |
1886 | SHELL_VAR * | |
1887 | find_global_variable_last_nameref (name) | |
1888 | const char *name; | |
1889 | { | |
1890 | SHELL_VAR *v, *nv; | |
1891 | char *newname; | |
1892 | int level; | |
1893 | ||
1894 | nv = v = find_global_variable_noref (name); | |
1895 | level = 0; | |
1896 | while (v && nameref_p (v)) | |
1897 | { | |
1898 | level++; | |
1899 | if (level > NAMEREF_MAX) | |
1900 | return ((SHELL_VAR *)0); /* error message here? */ | |
1901 | newname = nameref_cell (v); | |
1902 | if (newname == 0 || *newname == '\0') | |
1903 | return ((SHELL_VAR *)0); | |
1904 | nv = v; | |
1905 | v = find_global_variable_noref (newname); | |
1906 | } | |
1907 | return nv; | |
1908 | } | |
1909 | ||
1910 | static SHELL_VAR * | |
1911 | find_nameref_at_context (v, vc) | |
1912 | SHELL_VAR *v; | |
1913 | VAR_CONTEXT *vc; | |
1914 | { | |
1915 | SHELL_VAR *nv, *nv2; | |
1916 | VAR_CONTEXT *nvc; | |
1917 | char *newname; | |
1918 | int level; | |
1919 | ||
1920 | nv = v; | |
1921 | level = 1; | |
1922 | while (nv && nameref_p (nv)) | |
1923 | { | |
1924 | level++; | |
1925 | if (level > NAMEREF_MAX) | |
1926 | return ((SHELL_VAR *)NULL); | |
1927 | newname = nameref_cell (nv); | |
1928 | if (newname == 0 || *newname == '\0') | |
1929 | return ((SHELL_VAR *)NULL); | |
1930 | nv2 = hash_lookup (newname, vc->table); | |
1931 | if (nv2 == 0) | |
1932 | break; | |
1933 | nv = nv2; | |
1934 | } | |
1935 | return nv; | |
1936 | } | |
1937 | ||
1938 | /* Do nameref resolution from the VC, which is the local context for some | |
1939 | function or builtin, `up' the chain to the global variables context. If | |
1940 | NVCP is not NULL, return the variable context where we finally ended the | |
1941 | nameref resolution (so the bind_variable_internal can use the correct | |
1942 | variable context and hash table). */ | |
1943 | static SHELL_VAR * | |
1944 | find_variable_nameref_context (v, vc, nvcp) | |
1945 | SHELL_VAR *v; | |
1946 | VAR_CONTEXT *vc; | |
1947 | VAR_CONTEXT **nvcp; | |
1948 | { | |
1949 | SHELL_VAR *nv, *nv2; | |
1950 | VAR_CONTEXT *nvc; | |
1951 | ||
1952 | /* Look starting at the current context all the way `up' */ | |
1953 | for (nv = v, nvc = vc; nvc; nvc = nvc->down) | |
1954 | { | |
1955 | nv2 = find_nameref_at_context (nv, nvc); | |
1956 | if (nv2 == 0) | |
1957 | continue; | |
1958 | nv = nv2; | |
1959 | if (*nvcp) | |
1960 | *nvcp = nvc; | |
1961 | } | |
1962 | return (nameref_p (nv) ? (SHELL_VAR *)NULL : nv); | |
1963 | } | |
1964 | ||
1965 | /* Do nameref resolution from the VC, which is the local context for some | |
1966 | function or builtin, `up' the chain to the global variables context. If | |
1967 | NVCP is not NULL, return the variable context where we finally ended the | |
1968 | nameref resolution (so the bind_variable_internal can use the correct | |
1969 | variable context and hash table). */ | |
1970 | static SHELL_VAR * | |
1971 | find_variable_last_nameref_context (v, vc, nvcp) | |
1972 | SHELL_VAR *v; | |
1973 | VAR_CONTEXT *vc; | |
1974 | VAR_CONTEXT **nvcp; | |
1975 | { | |
1976 | SHELL_VAR *nv, *nv2; | |
1977 | VAR_CONTEXT *nvc; | |
1978 | ||
1979 | /* Look starting at the current context all the way `up' */ | |
1980 | for (nv = v, nvc = vc; nvc; nvc = nvc->down) | |
1981 | { | |
1982 | nv2 = find_nameref_at_context (nv, nvc); | |
1983 | if (nv2 == 0) | |
1984 | continue; | |
1985 | nv = nv2; | |
1986 | if (*nvcp) | |
1987 | *nvcp = nvc; | |
1988 | } | |
1989 | return (nameref_p (nv) ? nv : (SHELL_VAR *)NULL); | |
1990 | } | |
1991 | ||
1992 | /* Find a variable, forcing a search of the temporary environment first */ | |
1993 | SHELL_VAR * | |
1994 | find_variable_tempenv (name) | |
1995 | const char *name; | |
1996 | { | |
1997 | SHELL_VAR *var; | |
1998 | ||
1999 | var = find_variable_internal (name, 1); | |
2000 | if (var && nameref_p (var)) | |
2001 | var = find_variable_nameref (var); | |
2002 | return (var); | |
2003 | } | |
2004 | ||
2005 | /* Find a variable, not forcing a search of the temporary environment first */ | |
2006 | SHELL_VAR * | |
2007 | find_variable_notempenv (name) | |
2008 | const char *name; | |
2009 | { | |
2010 | SHELL_VAR *var; | |
2011 | ||
2012 | var = find_variable_internal (name, 0); | |
2013 | if (var && nameref_p (var)) | |
2014 | var = find_variable_nameref (var); | |
2015 | return (var); | |
2016 | } | |
2017 | ||
2018 | SHELL_VAR * | |
2019 | find_global_variable (name) | |
2020 | const char *name; | |
2021 | { | |
2022 | SHELL_VAR *var; | |
2023 | ||
2024 | var = var_lookup (name, global_variables); | |
2025 | if (var && nameref_p (var)) | |
2026 | var = find_variable_nameref (var); | |
2027 | ||
2028 | if (var == 0) | |
2029 | return ((SHELL_VAR *)NULL); | |
2030 | ||
2031 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); | |
2032 | } | |
2033 | ||
2034 | SHELL_VAR * | |
2035 | find_global_variable_noref (name) | |
2036 | const char *name; | |
2037 | { | |
2038 | SHELL_VAR *var; | |
2039 | ||
2040 | var = var_lookup (name, global_variables); | |
2041 | ||
2042 | if (var == 0) | |
2043 | return ((SHELL_VAR *)NULL); | |
2044 | ||
2045 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); | |
2046 | } | |
2047 | ||
2048 | SHELL_VAR * | |
2049 | find_shell_variable (name) | |
2050 | const char *name; | |
2051 | { | |
2052 | SHELL_VAR *var; | |
2053 | ||
2054 | var = var_lookup (name, shell_variables); | |
2055 | if (var && nameref_p (var)) | |
2056 | var = find_variable_nameref (var); | |
2057 | ||
2058 | if (var == 0) | |
2059 | return ((SHELL_VAR *)NULL); | |
2060 | ||
2061 | return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var); | |
2062 | } | |
2063 | ||
2064 | /* Look up the variable entry named NAME. Returns the entry or NULL. */ | |
2065 | SHELL_VAR * | |
2066 | find_variable (name) | |
2067 | const char *name; | |
2068 | { | |
2069 | SHELL_VAR *v; | |
2070 | ||
2071 | v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin))); | |
2072 | if (v && nameref_p (v)) | |
2073 | v = find_variable_nameref (v); | |
2074 | return v; | |
2075 | } | |
2076 | ||
2077 | SHELL_VAR * | |
2078 | find_variable_noref (name) | |
2079 | const char *name; | |
2080 | { | |
2081 | SHELL_VAR *v; | |
2082 | ||
2083 | v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin))); | |
2084 | return v; | |
2085 | } | |
2086 | ||
2087 | /* Look up the function entry whose name matches STRING. | |
2088 | Returns the entry or NULL. */ | |
2089 | SHELL_VAR * | |
2090 | find_function (name) | |
2091 | const char *name; | |
2092 | { | |
2093 | return (hash_lookup (name, shell_functions)); | |
2094 | } | |
2095 | ||
2096 | /* Find the function definition for the shell function named NAME. Returns | |
2097 | the entry or NULL. */ | |
2098 | FUNCTION_DEF * | |
2099 | find_function_def (name) | |
2100 | const char *name; | |
2101 | { | |
2102 | #if defined (DEBUGGER) | |
2103 | return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs)); | |
2104 | #else | |
2105 | return ((FUNCTION_DEF *)0); | |
2106 | #endif | |
2107 | } | |
2108 | ||
2109 | /* Return the value of VAR. VAR is assumed to have been the result of a | |
2110 | lookup without any subscript, if arrays are compiled into the shell. */ | |
2111 | char * | |
2112 | get_variable_value (var) | |
2113 | SHELL_VAR *var; | |
2114 | { | |
2115 | if (var == 0) | |
2116 | return ((char *)NULL); | |
2117 | #if defined (ARRAY_VARS) | |
2118 | else if (array_p (var)) | |
2119 | return (array_reference (array_cell (var), 0)); | |
2120 | else if (assoc_p (var)) | |
2121 | return (assoc_reference (assoc_cell (var), "0")); | |
2122 | #endif | |
2123 | else | |
2124 | return (value_cell (var)); | |
2125 | } | |
2126 | ||
2127 | /* Return the string value of a variable. Return NULL if the variable | |
2128 | doesn't exist. Don't cons a new string. This is a potential memory | |
2129 | leak if the variable is found in the temporary environment. Since | |
2130 | functions and variables have separate name spaces, returns NULL if | |
2131 | var_name is a shell function only. */ | |
2132 | char * | |
2133 | get_string_value (var_name) | |
2134 | const char *var_name; | |
2135 | { | |
2136 | SHELL_VAR *var; | |
2137 | ||
2138 | var = find_variable (var_name); | |
2139 | return ((var) ? get_variable_value (var) : (char *)NULL); | |
2140 | } | |
2141 | ||
2142 | /* This is present for use by the tilde and readline libraries. */ | |
2143 | char * | |
2144 | sh_get_env_value (v) | |
2145 | const char *v; | |
2146 | { | |
2147 | return get_string_value (v); | |
2148 | } | |
2149 | ||
2150 | /* **************************************************************** */ | |
2151 | /* */ | |
2152 | /* Creating and setting variables */ | |
2153 | /* */ | |
2154 | /* **************************************************************** */ | |
2155 | ||
2156 | /* Set NAME to VALUE if NAME has no value. */ | |
2157 | SHELL_VAR * | |
2158 | set_if_not (name, value) | |
2159 | char *name, *value; | |
2160 | { | |
2161 | SHELL_VAR *v; | |
2162 | ||
2163 | if (shell_variables == 0) | |
2164 | create_variable_tables (); | |
2165 | ||
2166 | v = find_variable (name); | |
2167 | if (v == 0) | |
2168 | v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0); | |
2169 | return (v); | |
2170 | } | |
2171 | ||
2172 | /* Create a local variable referenced by NAME. */ | |
2173 | SHELL_VAR * | |
2174 | make_local_variable (name) | |
2175 | const char *name; | |
2176 | { | |
2177 | SHELL_VAR *new_var, *old_var; | |
2178 | VAR_CONTEXT *vc; | |
2179 | int was_tmpvar; | |
2180 | char *tmp_value; | |
2181 | ||
2182 | /* local foo; local foo; is a no-op. */ | |
2183 | old_var = find_variable (name); | |
2184 | if (old_var && local_p (old_var) && old_var->context == variable_context) | |
2185 | { | |
2186 | VUNSETATTR (old_var, att_invisible); | |
2187 | return (old_var); | |
2188 | } | |
2189 | ||
2190 | was_tmpvar = old_var && tempvar_p (old_var); | |
2191 | if (was_tmpvar) | |
2192 | tmp_value = value_cell (old_var); | |
2193 | ||
2194 | for (vc = shell_variables; vc; vc = vc->down) | |
2195 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
2196 | break; | |
2197 | ||
2198 | if (vc == 0) | |
2199 | { | |
2200 | internal_error (_("make_local_variable: no function context at current scope")); | |
2201 | return ((SHELL_VAR *)NULL); | |
2202 | } | |
2203 | else if (vc->table == 0) | |
2204 | vc->table = hash_create (TEMPENV_HASH_BUCKETS); | |
2205 | ||
2206 | /* Since this is called only from the local/declare/typeset code, we can | |
2207 | call builtin_error here without worry (of course, it will also work | |
2208 | for anything that sets this_command_name). Variables with the `noassign' | |
2209 | attribute may not be made local. The test against old_var's context | |
2210 | level is to disallow local copies of readonly global variables (since I | |
2211 | believe that this could be a security hole). Readonly copies of calling | |
2212 | function local variables are OK. */ | |
2213 | if (old_var && (noassign_p (old_var) || | |
2214 | (readonly_p (old_var) && old_var->context == 0))) | |
2215 | { | |
2216 | if (readonly_p (old_var)) | |
2217 | sh_readonly (name); | |
2218 | return ((SHELL_VAR *)NULL); | |
2219 | } | |
2220 | ||
2221 | if (old_var == 0) | |
2222 | new_var = make_new_variable (name, vc->table); | |
2223 | else | |
2224 | { | |
2225 | new_var = make_new_variable (name, vc->table); | |
2226 | ||
2227 | /* If we found this variable in one of the temporary environments, | |
2228 | inherit its value. Watch to see if this causes problems with | |
2229 | things like `x=4 local x'. */ | |
2230 | if (was_tmpvar) | |
2231 | var_setvalue (new_var, savestring (tmp_value)); | |
2232 | ||
2233 | new_var->attributes = exported_p (old_var) ? att_exported : 0; | |
2234 | } | |
2235 | ||
2236 | vc->flags |= VC_HASLOCAL; | |
2237 | ||
2238 | new_var->context = variable_context; | |
2239 | VSETATTR (new_var, att_local); | |
2240 | ||
2241 | if (ifsname (name)) | |
2242 | setifs (new_var); | |
2243 | ||
2244 | return (new_var); | |
2245 | } | |
2246 | ||
2247 | /* Create a new shell variable with name NAME. */ | |
2248 | static SHELL_VAR * | |
2249 | new_shell_variable (name) | |
2250 | const char *name; | |
2251 | { | |
2252 | SHELL_VAR *entry; | |
2253 | ||
2254 | entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); | |
2255 | ||
2256 | entry->name = savestring (name); | |
2257 | var_setvalue (entry, (char *)NULL); | |
2258 | CLEAR_EXPORTSTR (entry); | |
2259 | ||
2260 | entry->dynamic_value = (sh_var_value_func_t *)NULL; | |
2261 | entry->assign_func = (sh_var_assign_func_t *)NULL; | |
2262 | ||
2263 | entry->attributes = 0; | |
2264 | ||
2265 | /* Always assume variables are to be made at toplevel! | |
2266 | make_local_variable has the responsibilty of changing the | |
2267 | variable context. */ | |
2268 | entry->context = 0; | |
2269 | ||
2270 | return (entry); | |
2271 | } | |
2272 | ||
2273 | /* Create a new shell variable with name NAME and add it to the hash table | |
2274 | TABLE. */ | |
2275 | static SHELL_VAR * | |
2276 | make_new_variable (name, table) | |
2277 | const char *name; | |
2278 | HASH_TABLE *table; | |
2279 | { | |
2280 | SHELL_VAR *entry; | |
2281 | BUCKET_CONTENTS *elt; | |
2282 | ||
2283 | entry = new_shell_variable (name); | |
2284 | ||
2285 | /* Make sure we have a shell_variables hash table to add to. */ | |
2286 | if (shell_variables == 0) | |
2287 | create_variable_tables (); | |
2288 | ||
2289 | elt = hash_insert (savestring (name), table, HASH_NOSRCH); | |
2290 | elt->data = (PTR_T)entry; | |
2291 | ||
2292 | return entry; | |
2293 | } | |
2294 | ||
2295 | #if defined (ARRAY_VARS) | |
2296 | SHELL_VAR * | |
2297 | make_new_array_variable (name) | |
2298 | char *name; | |
2299 | { | |
2300 | SHELL_VAR *entry; | |
2301 | ARRAY *array; | |
2302 | ||
2303 | entry = make_new_variable (name, global_variables->table); | |
2304 | array = array_create (); | |
2305 | ||
2306 | var_setarray (entry, array); | |
2307 | VSETATTR (entry, att_array); | |
2308 | return entry; | |
2309 | } | |
2310 | ||
2311 | SHELL_VAR * | |
2312 | make_local_array_variable (name, assoc_ok) | |
2313 | char *name; | |
2314 | int assoc_ok; | |
2315 | { | |
2316 | SHELL_VAR *var; | |
2317 | ARRAY *array; | |
2318 | ||
2319 | var = make_local_variable (name); | |
2320 | if (var == 0 || array_p (var) || (assoc_ok && assoc_p (var))) | |
2321 | return var; | |
2322 | ||
2323 | array = array_create (); | |
2324 | ||
2325 | dispose_variable_value (var); | |
2326 | var_setarray (var, array); | |
2327 | VSETATTR (var, att_array); | |
2328 | return var; | |
2329 | } | |
2330 | ||
2331 | SHELL_VAR * | |
2332 | make_new_assoc_variable (name) | |
2333 | char *name; | |
2334 | { | |
2335 | SHELL_VAR *entry; | |
2336 | HASH_TABLE *hash; | |
2337 | ||
2338 | entry = make_new_variable (name, global_variables->table); | |
2339 | hash = assoc_create (0); | |
2340 | ||
2341 | var_setassoc (entry, hash); | |
2342 | VSETATTR (entry, att_assoc); | |
2343 | return entry; | |
2344 | } | |
2345 | ||
2346 | SHELL_VAR * | |
2347 | make_local_assoc_variable (name) | |
2348 | char *name; | |
2349 | { | |
2350 | SHELL_VAR *var; | |
2351 | HASH_TABLE *hash; | |
2352 | ||
2353 | var = make_local_variable (name); | |
2354 | if (var == 0 || assoc_p (var)) | |
2355 | return var; | |
2356 | ||
2357 | dispose_variable_value (var); | |
2358 | hash = assoc_create (0); | |
2359 | ||
2360 | var_setassoc (var, hash); | |
2361 | VSETATTR (var, att_assoc); | |
2362 | return var; | |
2363 | } | |
2364 | #endif | |
2365 | ||
2366 | char * | |
2367 | make_variable_value (var, value, flags) | |
2368 | SHELL_VAR *var; | |
2369 | char *value; | |
2370 | int flags; | |
2371 | { | |
2372 | char *retval, *oval; | |
2373 | intmax_t lval, rval; | |
2374 | int expok, olen, op; | |
2375 | ||
2376 | /* If this variable has had its type set to integer (via `declare -i'), | |
2377 | then do expression evaluation on it and store the result. The | |
2378 | functions in expr.c (evalexp()) and bind_int_variable() are responsible | |
2379 | for turning off the integer flag if they don't want further | |
2380 | evaluation done. */ | |
2381 | if (integer_p (var)) | |
2382 | { | |
2383 | if (flags & ASS_APPEND) | |
2384 | { | |
2385 | oval = value_cell (var); | |
2386 | lval = evalexp (oval, &expok); /* ksh93 seems to do this */ | |
2387 | if (expok == 0) | |
2388 | { | |
2389 | top_level_cleanup (); | |
2390 | jump_to_top_level (DISCARD); | |
2391 | } | |
2392 | } | |
2393 | rval = evalexp (value, &expok); | |
2394 | if (expok == 0) | |
2395 | { | |
2396 | top_level_cleanup (); | |
2397 | jump_to_top_level (DISCARD); | |
2398 | } | |
2399 | if (flags & ASS_APPEND) | |
2400 | rval += lval; | |
2401 | retval = itos (rval); | |
2402 | } | |
2403 | #if defined (CASEMOD_ATTRS) | |
2404 | else if (capcase_p (var) || uppercase_p (var) || lowercase_p (var)) | |
2405 | { | |
2406 | if (flags & ASS_APPEND) | |
2407 | { | |
2408 | oval = get_variable_value (var); | |
2409 | if (oval == 0) /* paranoia */ | |
2410 | oval = ""; | |
2411 | olen = STRLEN (oval); | |
2412 | retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1); | |
2413 | strcpy (retval, oval); | |
2414 | if (value) | |
2415 | strcpy (retval+olen, value); | |
2416 | } | |
2417 | else if (*value) | |
2418 | retval = savestring (value); | |
2419 | else | |
2420 | { | |
2421 | retval = (char *)xmalloc (1); | |
2422 | retval[0] = '\0'; | |
2423 | } | |
2424 | op = capcase_p (var) ? CASE_CAPITALIZE | |
2425 | : (uppercase_p (var) ? CASE_UPPER : CASE_LOWER); | |
2426 | oval = sh_modcase (retval, (char *)0, op); | |
2427 | free (retval); | |
2428 | retval = oval; | |
2429 | } | |
2430 | #endif /* CASEMOD_ATTRS */ | |
2431 | else if (value) | |
2432 | { | |
2433 | if (flags & ASS_APPEND) | |
2434 | { | |
2435 | oval = get_variable_value (var); | |
2436 | if (oval == 0) /* paranoia */ | |
2437 | oval = ""; | |
2438 | olen = STRLEN (oval); | |
2439 | retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1); | |
2440 | strcpy (retval, oval); | |
2441 | if (value) | |
2442 | strcpy (retval+olen, value); | |
2443 | } | |
2444 | else if (*value) | |
2445 | retval = savestring (value); | |
2446 | else | |
2447 | { | |
2448 | retval = (char *)xmalloc (1); | |
2449 | retval[0] = '\0'; | |
2450 | } | |
2451 | } | |
2452 | else | |
2453 | retval = (char *)NULL; | |
2454 | ||
2455 | return retval; | |
2456 | } | |
2457 | ||
2458 | /* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the | |
2459 | temporary environment (but usually is not). */ | |
2460 | static SHELL_VAR * | |
2461 | bind_variable_internal (name, value, table, hflags, aflags) | |
2462 | const char *name; | |
2463 | char *value; | |
2464 | HASH_TABLE *table; | |
2465 | int hflags, aflags; | |
2466 | { | |
2467 | char *newval; | |
2468 | SHELL_VAR *entry; | |
2469 | ||
2470 | entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table); | |
2471 | /* Follow the nameref chain here if this is the global variables table */ | |
2472 | if (entry && nameref_p (entry) && (invisible_p (entry) == 0) && table == global_variables->table) | |
2473 | { | |
2474 | entry = find_global_variable (entry->name); | |
2475 | /* Let's see if we have a nameref referencing a variable that hasn't yet | |
2476 | been created. */ | |
2477 | if (entry == 0) | |
2478 | entry = find_variable_last_nameref (name); /* XXX */ | |
2479 | if (entry == 0) /* just in case */ | |
2480 | return (entry); | |
2481 | } | |
2482 | ||
2483 | /* The first clause handles `declare -n ref; ref=x;' */ | |
2484 | if (entry && invisible_p (entry) && nameref_p (entry)) | |
2485 | goto assign_value; | |
2486 | else if (entry && nameref_p (entry)) | |
2487 | { | |
2488 | newval = nameref_cell (entry); | |
2489 | #if defined (ARRAY_VARS) | |
2490 | /* declare -n foo=x[2] */ | |
2491 | if (valid_array_reference (newval)) | |
2492 | /* XXX - should it be aflags? */ | |
2493 | entry = assign_array_element (newval, make_variable_value (entry, value, 0), aflags); | |
2494 | else | |
2495 | #endif | |
2496 | { | |
2497 | entry = make_new_variable (newval, table); | |
2498 | var_setvalue (entry, make_variable_value (entry, value, 0)); | |
2499 | } | |
2500 | } | |
2501 | else if (entry == 0) | |
2502 | { | |
2503 | entry = make_new_variable (name, table); | |
2504 | var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */ | |
2505 | } | |
2506 | else if (entry->assign_func) /* array vars have assign functions now */ | |
2507 | { | |
2508 | INVALIDATE_EXPORTSTR (entry); | |
2509 | newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value; | |
2510 | if (assoc_p (entry)) | |
2511 | entry = (*(entry->assign_func)) (entry, newval, -1, savestring ("0")); | |
2512 | else if (array_p (entry)) | |
2513 | entry = (*(entry->assign_func)) (entry, newval, 0, 0); | |
2514 | else | |
2515 | entry = (*(entry->assign_func)) (entry, newval, -1, 0); | |
2516 | if (newval != value) | |
2517 | free (newval); | |
2518 | return (entry); | |
2519 | } | |
2520 | else | |
2521 | { | |
2522 | assign_value: | |
2523 | if (readonly_p (entry) || noassign_p (entry)) | |
2524 | { | |
2525 | if (readonly_p (entry)) | |
2526 | err_readonly (name); | |
2527 | return (entry); | |
2528 | } | |
2529 | ||
2530 | /* Variables which are bound are visible. */ | |
2531 | VUNSETATTR (entry, att_invisible); | |
2532 | ||
2533 | #if defined (ARRAY_VARS) | |
2534 | if (assoc_p (entry) || array_p (entry)) | |
2535 | newval = make_array_variable_value (entry, 0, "0", value, aflags); | |
2536 | else | |
2537 | #endif | |
2538 | ||
2539 | newval = make_variable_value (entry, value, aflags); /* XXX */ | |
2540 | ||
2541 | /* Invalidate any cached export string */ | |
2542 | INVALIDATE_EXPORTSTR (entry); | |
2543 | ||
2544 | #if defined (ARRAY_VARS) | |
2545 | /* XXX -- this bears looking at again -- XXX */ | |
2546 | /* If an existing array variable x is being assigned to with x=b or | |
2547 | `read x' or something of that nature, silently convert it to | |
2548 | x[0]=b or `read x[0]'. */ | |
2549 | if (assoc_p (entry)) | |
2550 | { | |
2551 | assoc_insert (assoc_cell (entry), savestring ("0"), newval); | |
2552 | free (newval); | |
2553 | } | |
2554 | else if (array_p (entry)) | |
2555 | { | |
2556 | array_insert (array_cell (entry), 0, newval); | |
2557 | free (newval); | |
2558 | } | |
2559 | else | |
2560 | #endif | |
2561 | { | |
2562 | FREE (value_cell (entry)); | |
2563 | var_setvalue (entry, newval); | |
2564 | } | |
2565 | } | |
2566 | ||
2567 | if (mark_modified_vars) | |
2568 | VSETATTR (entry, att_exported); | |
2569 | ||
2570 | if (exported_p (entry)) | |
2571 | array_needs_making = 1; | |
2572 | ||
2573 | return (entry); | |
2574 | } | |
2575 | ||
2576 | /* Bind a variable NAME to VALUE. This conses up the name | |
2577 | and value strings. If we have a temporary environment, we bind there | |
2578 | first, then we bind into shell_variables. */ | |
2579 | ||
2580 | SHELL_VAR * | |
2581 | bind_variable (name, value, flags) | |
2582 | const char *name; | |
2583 | char *value; | |
2584 | int flags; | |
2585 | { | |
2586 | SHELL_VAR *v, *nv; | |
2587 | VAR_CONTEXT *vc, *nvc; | |
2588 | int level; | |
2589 | ||
2590 | if (shell_variables == 0) | |
2591 | create_variable_tables (); | |
2592 | ||
2593 | /* If we have a temporary environment, look there first for the variable, | |
2594 | and, if found, modify the value there before modifying it in the | |
2595 | shell_variables table. This allows sourced scripts to modify values | |
2596 | given to them in a temporary environment while modifying the variable | |
2597 | value that the caller sees. */ | |
2598 | if (temporary_env) | |
2599 | bind_tempenv_variable (name, value); | |
2600 | ||
2601 | /* XXX -- handle local variables here. */ | |
2602 | for (vc = shell_variables; vc; vc = vc->down) | |
2603 | { | |
2604 | if (vc_isfuncenv (vc) || vc_isbltnenv (vc)) | |
2605 | { | |
2606 | v = hash_lookup (name, vc->table); | |
2607 | nvc = vc; | |
2608 | if (v && nameref_p (v)) | |
2609 | { | |
2610 | nv = find_variable_nameref_context (v, vc, &nvc); | |
2611 | if (nv == 0) | |
2612 | { | |
2613 | nv = find_variable_last_nameref_context (v, vc, &nvc); | |
2614 | if (nv && nameref_p (nv)) | |
2615 | return (bind_variable_internal (nameref_cell (nv), value, nvc->table, 0, flags)); | |
2616 | else | |
2617 | v = nv; | |
2618 | } | |
2619 | else | |
2620 | v = nv; | |
2621 | } | |
2622 | if (v) | |
2623 | return (bind_variable_internal (v->name, value, nvc->table, 0, flags)); | |
2624 | } | |
2625 | } | |
2626 | /* bind_variable_internal will handle nameref resolution in this case */ | |
2627 | return (bind_variable_internal (name, value, global_variables->table, 0, flags)); | |
2628 | } | |
2629 | ||
2630 | SHELL_VAR * | |
2631 | bind_global_variable (name, value, flags) | |
2632 | const char *name; | |
2633 | char *value; | |
2634 | int flags; | |
2635 | { | |
2636 | SHELL_VAR *v, *nv; | |
2637 | VAR_CONTEXT *vc, *nvc; | |
2638 | int level; | |
2639 | ||
2640 | if (shell_variables == 0) | |
2641 | create_variable_tables (); | |
2642 | ||
2643 | /* bind_variable_internal will handle nameref resolution in this case */ | |
2644 | return (bind_variable_internal (name, value, global_variables->table, 0, flags)); | |
2645 | } | |
2646 | ||
2647 | /* Make VAR, a simple shell variable, have value VALUE. Once assigned a | |
2648 | value, variables are no longer invisible. This is a duplicate of part | |
2649 | of the internals of bind_variable. If the variable is exported, or | |
2650 | all modified variables should be exported, mark the variable for export | |
2651 | and note that the export environment needs to be recreated. */ | |
2652 | SHELL_VAR * | |
2653 | bind_variable_value (var, value, aflags) | |
2654 | SHELL_VAR *var; | |
2655 | char *value; | |
2656 | int aflags; | |
2657 | { | |
2658 | char *t; | |
2659 | ||
2660 | VUNSETATTR (var, att_invisible); | |
2661 | ||
2662 | if (var->assign_func) | |
2663 | { | |
2664 | /* If we're appending, we need the old value, so use | |
2665 | make_variable_value */ | |
2666 | t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value; | |
2667 | (*(var->assign_func)) (var, t, -1, 0); | |
2668 | if (t != value && t) | |
2669 | free (t); | |
2670 | } | |
2671 | else | |
2672 | { | |
2673 | t = make_variable_value (var, value, aflags); | |
2674 | FREE (value_cell (var)); | |
2675 | var_setvalue (var, t); | |
2676 | } | |
2677 | ||
2678 | INVALIDATE_EXPORTSTR (var); | |
2679 | ||
2680 | if (mark_modified_vars) | |
2681 | VSETATTR (var, att_exported); | |
2682 | ||
2683 | if (exported_p (var)) | |
2684 | array_needs_making = 1; | |
2685 | ||
2686 | return (var); | |
2687 | } | |
2688 | ||
2689 | /* Bind/create a shell variable with the name LHS to the RHS. | |
2690 | This creates or modifies a variable such that it is an integer. | |
2691 | ||
2692 | This used to be in expr.c, but it is here so that all of the | |
2693 | variable binding stuff is localized. Since we don't want any | |
2694 | recursive evaluation from bind_variable() (possible without this code, | |
2695 | since bind_variable() calls the evaluator for variables with the integer | |
2696 | attribute set), we temporarily turn off the integer attribute for each | |
2697 | variable we set here, then turn it back on after binding as necessary. */ | |
2698 | ||
2699 | SHELL_VAR * | |
2700 | bind_int_variable (lhs, rhs) | |
2701 | char *lhs, *rhs; | |
2702 | { | |
2703 | register SHELL_VAR *v; | |
2704 | int isint, isarr, implicitarray; | |
2705 | ||
2706 | isint = isarr = implicitarray = 0; | |
2707 | #if defined (ARRAY_VARS) | |
2708 | if (valid_array_reference (lhs)) | |
2709 | { | |
2710 | isarr = 1; | |
2711 | v = array_variable_part (lhs, (char **)0, (int *)0); | |
2712 | } | |
2713 | else | |
2714 | #endif | |
2715 | v = find_variable (lhs); | |
2716 | ||
2717 | if (v) | |
2718 | { | |
2719 | isint = integer_p (v); | |
2720 | VUNSETATTR (v, att_integer); | |
2721 | #if defined (ARRAY_VARS) | |
2722 | if (array_p (v) && isarr == 0) | |
2723 | implicitarray = 1; | |
2724 | #endif | |
2725 | } | |
2726 | ||
2727 | #if defined (ARRAY_VARS) | |
2728 | if (isarr) | |
2729 | v = assign_array_element (lhs, rhs, 0); | |
2730 | else if (implicitarray) | |
2731 | v = bind_array_variable (lhs, 0, rhs, 0); | |
2732 | else | |
2733 | #endif | |
2734 | v = bind_variable (lhs, rhs, 0); | |
2735 | ||
2736 | if (v && isint) | |
2737 | VSETATTR (v, att_integer); | |
2738 | ||
2739 | return (v); | |
2740 | } | |
2741 | ||
2742 | SHELL_VAR * | |
2743 | bind_var_to_int (var, val) | |
2744 | char *var; | |
2745 | intmax_t val; | |
2746 | { | |
2747 | char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p; | |
2748 | ||
2749 | p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0); | |
2750 | return (bind_int_variable (var, p)); | |
2751 | } | |
2752 | ||
2753 | /* Do a function binding to a variable. You pass the name and | |
2754 | the command to bind to. This conses the name and command. */ | |
2755 | SHELL_VAR * | |
2756 | bind_function (name, value) | |
2757 | const char *name; | |
2758 | COMMAND *value; | |
2759 | { | |
2760 | SHELL_VAR *entry; | |
2761 | ||
2762 | entry = find_function (name); | |
2763 | if (entry == 0) | |
2764 | { | |
2765 | BUCKET_CONTENTS *elt; | |
2766 | ||
2767 | elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH); | |
2768 | entry = new_shell_variable (name); | |
2769 | elt->data = (PTR_T)entry; | |
2770 | } | |
2771 | else | |
2772 | INVALIDATE_EXPORTSTR (entry); | |
2773 | ||
2774 | if (var_isset (entry)) | |
2775 | dispose_command (function_cell (entry)); | |
2776 | ||
2777 | if (value) | |
2778 | var_setfunc (entry, copy_command (value)); | |
2779 | else | |
2780 | var_setfunc (entry, 0); | |
2781 | ||
2782 | VSETATTR (entry, att_function); | |
2783 | ||
2784 | if (mark_modified_vars) | |
2785 | VSETATTR (entry, att_exported); | |
2786 | ||
2787 | VUNSETATTR (entry, att_invisible); /* Just to be sure */ | |
2788 | ||
2789 | if (exported_p (entry)) | |
2790 | array_needs_making = 1; | |
2791 | ||
2792 | #if defined (PROGRAMMABLE_COMPLETION) | |
2793 | set_itemlist_dirty (&it_functions); | |
2794 | #endif | |
2795 | ||
2796 | return (entry); | |
2797 | } | |
2798 | ||
2799 | #if defined (DEBUGGER) | |
2800 | /* Bind a function definition, which includes source file and line number | |
2801 | information in addition to the command, into the FUNCTION_DEF hash table.*/ | |
2802 | void | |
2803 | bind_function_def (name, value) | |
2804 | const char *name; | |
2805 | FUNCTION_DEF *value; | |
2806 | { | |
2807 | FUNCTION_DEF *entry; | |
2808 | BUCKET_CONTENTS *elt; | |
2809 | COMMAND *cmd; | |
2810 | ||
2811 | entry = find_function_def (name); | |
2812 | if (entry) | |
2813 | { | |
2814 | dispose_function_def_contents (entry); | |
2815 | entry = copy_function_def_contents (value, entry); | |
2816 | } | |
2817 | else | |
2818 | { | |
2819 | cmd = value->command; | |
2820 | value->command = 0; | |
2821 | entry = copy_function_def (value); | |
2822 | value->command = cmd; | |
2823 | ||
2824 | elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH); | |
2825 | elt->data = (PTR_T *)entry; | |
2826 | } | |
2827 | } | |
2828 | #endif /* DEBUGGER */ | |
2829 | ||
2830 | /* Add STRING, which is of the form foo=bar, to the temporary environment | |
2831 | HASH_TABLE (temporary_env). The functions in execute_cmd.c are | |
2832 | responsible for moving the main temporary env to one of the other | |
2833 | temporary environments. The expansion code in subst.c calls this. */ | |
2834 | int | |
2835 | assign_in_env (word, flags) | |
2836 | WORD_DESC *word; | |
2837 | int flags; | |
2838 | { | |
2839 | int offset; | |
2840 | char *name, *temp, *value; | |
2841 | SHELL_VAR *var; | |
2842 | const char *string; | |
2843 | ||
2844 | string = word->word; | |
2845 | ||
2846 | offset = assignment (string, 0); | |
2847 | name = savestring (string); | |
2848 | value = (char *)NULL; | |
2849 | ||
2850 | if (name[offset] == '=') | |
2851 | { | |
2852 | name[offset] = 0; | |
2853 | ||
2854 | /* ignore the `+' when assigning temporary environment */ | |
2855 | if (name[offset - 1] == '+') | |
2856 | name[offset - 1] = '\0'; | |
2857 | ||
2858 | var = find_variable (name); | |
2859 | if (var && (readonly_p (var) || noassign_p (var))) | |
2860 | { | |
2861 | if (readonly_p (var)) | |
2862 | err_readonly (name); | |
2863 | free (name); | |
2864 | return (0); | |
2865 | } | |
2866 | ||
2867 | temp = name + offset + 1; | |
2868 | value = expand_assignment_string_to_string (temp, 0); | |
2869 | } | |
2870 | ||
2871 | if (temporary_env == 0) | |
2872 | temporary_env = hash_create (TEMPENV_HASH_BUCKETS); | |
2873 | ||
2874 | var = hash_lookup (name, temporary_env); | |
2875 | if (var == 0) | |
2876 | var = make_new_variable (name, temporary_env); | |
2877 | else | |
2878 | FREE (value_cell (var)); | |
2879 | ||
2880 | if (value == 0) | |
2881 | { | |
2882 | value = (char *)xmalloc (1); /* like do_assignment_internal */ | |
2883 | value[0] = '\0'; | |
2884 | } | |
2885 | ||
2886 | var_setvalue (var, value); | |
2887 | var->attributes |= (att_exported|att_tempvar); | |
2888 | var->context = variable_context; /* XXX */ | |
2889 | ||
2890 | INVALIDATE_EXPORTSTR (var); | |
2891 | var->exportstr = mk_env_string (name, value); | |
2892 | ||
2893 | array_needs_making = 1; | |
2894 | ||
2895 | if (flags) | |
2896 | stupidly_hack_special_variables (name); | |
2897 | ||
2898 | if (echo_command_at_execute) | |
2899 | /* The Korn shell prints the `+ ' in front of assignment statements, | |
2900 | so we do too. */ | |
2901 | xtrace_print_assignment (name, value, 0, 1); | |
2902 | ||
2903 | free (name); | |
2904 | return 1; | |
2905 | } | |
2906 | ||
2907 | /* **************************************************************** */ | |
2908 | /* */ | |
2909 | /* Copying variables */ | |
2910 | /* */ | |
2911 | /* **************************************************************** */ | |
2912 | ||
2913 | #ifdef INCLUDE_UNUSED | |
2914 | /* Copy VAR to a new data structure and return that structure. */ | |
2915 | SHELL_VAR * | |
2916 | copy_variable (var) | |
2917 | SHELL_VAR *var; | |
2918 | { | |
2919 | SHELL_VAR *copy = (SHELL_VAR *)NULL; | |
2920 | ||
2921 | if (var) | |
2922 | { | |
2923 | copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); | |
2924 | ||
2925 | copy->attributes = var->attributes; | |
2926 | copy->name = savestring (var->name); | |
2927 | ||
2928 | if (function_p (var)) | |
2929 | var_setfunc (copy, copy_command (function_cell (var))); | |
2930 | #if defined (ARRAY_VARS) | |
2931 | else if (array_p (var)) | |
2932 | var_setarray (copy, array_copy (array_cell (var))); | |
2933 | else if (assoc_p (var)) | |
2934 | var_setassoc (copy, assoc_copy (assoc_cell (var))); | |
2935 | #endif | |
2936 | else if (nameref_cell (var)) /* XXX - nameref */ | |
2937 | var_setref (copy, savestring (nameref_cell (var))); | |
2938 | else if (value_cell (var)) /* XXX - nameref */ | |
2939 | var_setvalue (copy, savestring (value_cell (var))); | |
2940 | else | |
2941 | var_setvalue (copy, (char *)NULL); | |
2942 | ||
2943 | copy->dynamic_value = var->dynamic_value; | |
2944 | copy->assign_func = var->assign_func; | |
2945 | ||
2946 | copy->exportstr = COPY_EXPORTSTR (var); | |
2947 | ||
2948 | copy->context = var->context; | |
2949 | } | |
2950 | return (copy); | |
2951 | } | |
2952 | #endif | |
2953 | ||
2954 | /* **************************************************************** */ | |
2955 | /* */ | |
2956 | /* Deleting and unsetting variables */ | |
2957 | /* */ | |
2958 | /* **************************************************************** */ | |
2959 | ||
2960 | /* Dispose of the information attached to VAR. */ | |
2961 | static void | |
2962 | dispose_variable_value (var) | |
2963 | SHELL_VAR *var; | |
2964 | { | |
2965 | if (function_p (var)) | |
2966 | dispose_command (function_cell (var)); | |
2967 | #if defined (ARRAY_VARS) | |
2968 | else if (array_p (var)) | |
2969 | array_dispose (array_cell (var)); | |
2970 | else if (assoc_p (var)) | |
2971 | assoc_dispose (assoc_cell (var)); | |
2972 | #endif | |
2973 | else if (nameref_p (var)) | |
2974 | FREE (nameref_cell (var)); | |
2975 | else | |
2976 | FREE (value_cell (var)); | |
2977 | } | |
2978 | ||
2979 | void | |
2980 | dispose_variable (var) | |
2981 | SHELL_VAR *var; | |
2982 | { | |
2983 | if (var == 0) | |
2984 | return; | |
2985 | ||
2986 | if (nofree_p (var) == 0) | |
2987 | dispose_variable_value (var); | |
2988 | ||
2989 | FREE_EXPORTSTR (var); | |
2990 | ||
2991 | free (var->name); | |
2992 | ||
2993 | if (exported_p (var)) | |
2994 | array_needs_making = 1; | |
2995 | ||
2996 | free (var); | |
2997 | } | |
2998 | ||
2999 | /* Unset the shell variable referenced by NAME. Unsetting a nameref variable | |
3000 | unsets the variable it resolves to but leaves the nameref alone. */ | |
3001 | int | |
3002 | unbind_variable (name) | |
3003 | const char *name; | |
3004 | { | |
3005 | SHELL_VAR *v, *nv; | |
3006 | int r; | |
3007 | ||
3008 | v = var_lookup (name, shell_variables); | |
3009 | nv = (v && nameref_p (v)) ? find_variable_nameref (v) : (SHELL_VAR *)NULL; | |
3010 | ||
3011 | r = nv ? makunbound (nv->name, shell_variables) : makunbound (name, shell_variables); | |
3012 | return r; | |
3013 | } | |
3014 | ||
3015 | /* Unbind NAME, where NAME is assumed to be a nameref variable */ | |
3016 | int | |
3017 | unbind_nameref (name) | |
3018 | const char *name; | |
3019 | { | |
3020 | SHELL_VAR *v; | |
3021 | ||
3022 | v = var_lookup (name, shell_variables); | |
3023 | if (v && nameref_p (v)) | |
3024 | return makunbound (name, shell_variables); | |
3025 | return 0; | |
3026 | } | |
3027 | ||
3028 | /* Unset the shell function named NAME. */ | |
3029 | int | |
3030 | unbind_func (name) | |
3031 | const char *name; | |
3032 | { | |
3033 | BUCKET_CONTENTS *elt; | |
3034 | SHELL_VAR *func; | |
3035 | ||
3036 | elt = hash_remove (name, shell_functions, 0); | |
3037 | ||
3038 | if (elt == 0) | |
3039 | return -1; | |
3040 | ||
3041 | #if defined (PROGRAMMABLE_COMPLETION) | |
3042 | set_itemlist_dirty (&it_functions); | |
3043 | #endif | |
3044 | ||
3045 | func = (SHELL_VAR *)elt->data; | |
3046 | if (func) | |
3047 | { | |
3048 | if (exported_p (func)) | |
3049 | array_needs_making++; | |
3050 | dispose_variable (func); | |
3051 | } | |
3052 | ||
3053 | free (elt->key); | |
3054 | free (elt); | |
3055 | ||
3056 | return 0; | |
3057 | } | |
3058 | ||
3059 | #if defined (DEBUGGER) | |
3060 | int | |
3061 | unbind_function_def (name) | |
3062 | const char *name; | |
3063 | { | |
3064 | BUCKET_CONTENTS *elt; | |
3065 | FUNCTION_DEF *funcdef; | |
3066 | ||
3067 | elt = hash_remove (name, shell_function_defs, 0); | |
3068 | ||
3069 | if (elt == 0) | |
3070 | return -1; | |
3071 | ||
3072 | funcdef = (FUNCTION_DEF *)elt->data; | |
3073 | if (funcdef) | |
3074 | dispose_function_def (funcdef); | |
3075 | ||
3076 | free (elt->key); | |
3077 | free (elt); | |
3078 | ||
3079 | return 0; | |
3080 | } | |
3081 | #endif /* DEBUGGER */ | |
3082 | ||
3083 | /* Make the variable associated with NAME go away. HASH_LIST is the | |
3084 | hash table from which this variable should be deleted (either | |
3085 | shell_variables or shell_functions). | |
3086 | Returns non-zero if the variable couldn't be found. */ | |
3087 | int | |
3088 | makunbound (name, vc) | |
3089 | const char *name; | |
3090 | VAR_CONTEXT *vc; | |
3091 | { | |
3092 | BUCKET_CONTENTS *elt, *new_elt; | |
3093 | SHELL_VAR *old_var; | |
3094 | VAR_CONTEXT *v; | |
3095 | char *t; | |
3096 | ||
3097 | for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down) | |
3098 | if (elt = hash_remove (name, v->table, 0)) | |
3099 | break; | |
3100 | ||
3101 | if (elt == 0) | |
3102 | return (-1); | |
3103 | ||
3104 | old_var = (SHELL_VAR *)elt->data; | |
3105 | ||
3106 | if (old_var && exported_p (old_var)) | |
3107 | array_needs_making++; | |
3108 | ||
3109 | /* If we're unsetting a local variable and we're still executing inside | |
3110 | the function, just mark the variable as invisible. The function | |
3111 | eventually called by pop_var_context() will clean it up later. This | |
3112 | must be done so that if the variable is subsequently assigned a new | |
3113 | value inside the function, the `local' attribute is still present. | |
3114 | We also need to add it back into the correct hash table. */ | |
3115 | if (old_var && local_p (old_var) && variable_context == old_var->context) | |
3116 | { | |
3117 | if (nofree_p (old_var)) | |
3118 | var_setvalue (old_var, (char *)NULL); | |
3119 | #if defined (ARRAY_VARS) | |
3120 | else if (array_p (old_var)) | |
3121 | array_dispose (array_cell (old_var)); | |
3122 | else if (assoc_p (old_var)) | |
3123 | assoc_dispose (assoc_cell (old_var)); | |
3124 | #endif | |
3125 | else if (nameref_p (old_var)) | |
3126 | FREE (nameref_cell (old_var)); | |
3127 | else | |
3128 | FREE (value_cell (old_var)); | |
3129 | /* Reset the attributes. Preserve the export attribute if the variable | |
3130 | came from a temporary environment. Make sure it stays local, and | |
3131 | make it invisible. */ | |
3132 | old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0; | |
3133 | VSETATTR (old_var, att_local); | |
3134 | VSETATTR (old_var, att_invisible); | |
3135 | var_setvalue (old_var, (char *)NULL); | |
3136 | INVALIDATE_EXPORTSTR (old_var); | |
3137 | ||
3138 | new_elt = hash_insert (savestring (old_var->name), v->table, 0); | |
3139 | new_elt->data = (PTR_T)old_var; | |
3140 | stupidly_hack_special_variables (old_var->name); | |
3141 | ||
3142 | free (elt->key); | |
3143 | free (elt); | |
3144 | return (0); | |
3145 | } | |
3146 | ||
3147 | /* Have to save a copy of name here, because it might refer to | |
3148 | old_var->name. If so, stupidly_hack_special_variables will | |
3149 | reference freed memory. */ | |
3150 | t = savestring (name); | |
3151 | ||
3152 | free (elt->key); | |
3153 | free (elt); | |
3154 | ||
3155 | dispose_variable (old_var); | |
3156 | stupidly_hack_special_variables (t); | |
3157 | free (t); | |
3158 | ||
3159 | return (0); | |
3160 | } | |
3161 | ||
3162 | /* Get rid of all of the variables in the current context. */ | |
3163 | void | |
3164 | kill_all_local_variables () | |
3165 | { | |
3166 | VAR_CONTEXT *vc; | |
3167 | ||
3168 | for (vc = shell_variables; vc; vc = vc->down) | |
3169 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
3170 | break; | |
3171 | if (vc == 0) | |
3172 | return; /* XXX */ | |
3173 | ||
3174 | if (vc->table && vc_haslocals (vc)) | |
3175 | { | |
3176 | delete_all_variables (vc->table); | |
3177 | hash_dispose (vc->table); | |
3178 | } | |
3179 | vc->table = (HASH_TABLE *)NULL; | |
3180 | } | |
3181 | ||
3182 | static void | |
3183 | free_variable_hash_data (data) | |
3184 | PTR_T data; | |
3185 | { | |
3186 | SHELL_VAR *var; | |
3187 | ||
3188 | var = (SHELL_VAR *)data; | |
3189 | dispose_variable (var); | |
3190 | } | |
3191 | ||
3192 | /* Delete the entire contents of the hash table. */ | |
3193 | void | |
3194 | delete_all_variables (hashed_vars) | |
3195 | HASH_TABLE *hashed_vars; | |
3196 | { | |
3197 | hash_flush (hashed_vars, free_variable_hash_data); | |
3198 | } | |
3199 | ||
3200 | /* **************************************************************** */ | |
3201 | /* */ | |
3202 | /* Setting variable attributes */ | |
3203 | /* */ | |
3204 | /* **************************************************************** */ | |
3205 | ||
3206 | #define FIND_OR_MAKE_VARIABLE(name, entry) \ | |
3207 | do \ | |
3208 | { \ | |
3209 | entry = find_variable (name); \ | |
3210 | if (!entry) \ | |
3211 | { \ | |
3212 | entry = bind_variable (name, "", 0); \ | |
3213 | if (!no_invisible_vars && entry) entry->attributes |= att_invisible; \ | |
3214 | } \ | |
3215 | } \ | |
3216 | while (0) | |
3217 | ||
3218 | /* Make the variable associated with NAME be readonly. | |
3219 | If NAME does not exist yet, create it. */ | |
3220 | void | |
3221 | set_var_read_only (name) | |
3222 | char *name; | |
3223 | { | |
3224 | SHELL_VAR *entry; | |
3225 | ||
3226 | FIND_OR_MAKE_VARIABLE (name, entry); | |
3227 | VSETATTR (entry, att_readonly); | |
3228 | } | |
3229 | ||
3230 | #ifdef INCLUDE_UNUSED | |
3231 | /* Make the function associated with NAME be readonly. | |
3232 | If NAME does not exist, we just punt, like auto_export code below. */ | |
3233 | void | |
3234 | set_func_read_only (name) | |
3235 | const char *name; | |
3236 | { | |
3237 | SHELL_VAR *entry; | |
3238 | ||
3239 | entry = find_function (name); | |
3240 | if (entry) | |
3241 | VSETATTR (entry, att_readonly); | |
3242 | } | |
3243 | ||
3244 | /* Make the variable associated with NAME be auto-exported. | |
3245 | If NAME does not exist yet, create it. */ | |
3246 | void | |
3247 | set_var_auto_export (name) | |
3248 | char *name; | |
3249 | { | |
3250 | SHELL_VAR *entry; | |
3251 | ||
3252 | FIND_OR_MAKE_VARIABLE (name, entry); | |
3253 | set_auto_export (entry); | |
3254 | } | |
3255 | ||
3256 | /* Make the function associated with NAME be auto-exported. */ | |
3257 | void | |
3258 | set_func_auto_export (name) | |
3259 | const char *name; | |
3260 | { | |
3261 | SHELL_VAR *entry; | |
3262 | ||
3263 | entry = find_function (name); | |
3264 | if (entry) | |
3265 | set_auto_export (entry); | |
3266 | } | |
3267 | #endif | |
3268 | ||
3269 | /* **************************************************************** */ | |
3270 | /* */ | |
3271 | /* Creating lists of variables */ | |
3272 | /* */ | |
3273 | /* **************************************************************** */ | |
3274 | ||
3275 | static VARLIST * | |
3276 | vlist_alloc (nentries) | |
3277 | int nentries; | |
3278 | { | |
3279 | VARLIST *vlist; | |
3280 | ||
3281 | vlist = (VARLIST *)xmalloc (sizeof (VARLIST)); | |
3282 | vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *)); | |
3283 | vlist->list_size = nentries; | |
3284 | vlist->list_len = 0; | |
3285 | vlist->list[0] = (SHELL_VAR *)NULL; | |
3286 | ||
3287 | return vlist; | |
3288 | } | |
3289 | ||
3290 | static VARLIST * | |
3291 | vlist_realloc (vlist, n) | |
3292 | VARLIST *vlist; | |
3293 | int n; | |
3294 | { | |
3295 | if (vlist == 0) | |
3296 | return (vlist = vlist_alloc (n)); | |
3297 | if (n > vlist->list_size) | |
3298 | { | |
3299 | vlist->list_size = n; | |
3300 | vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *)); | |
3301 | } | |
3302 | return vlist; | |
3303 | } | |
3304 | ||
3305 | static void | |
3306 | vlist_add (vlist, var, flags) | |
3307 | VARLIST *vlist; | |
3308 | SHELL_VAR *var; | |
3309 | int flags; | |
3310 | { | |
3311 | register int i; | |
3312 | ||
3313 | for (i = 0; i < vlist->list_len; i++) | |
3314 | if (STREQ (var->name, vlist->list[i]->name)) | |
3315 | break; | |
3316 | if (i < vlist->list_len) | |
3317 | return; | |
3318 | ||
3319 | if (i >= vlist->list_size) | |
3320 | vlist = vlist_realloc (vlist, vlist->list_size + 16); | |
3321 | ||
3322 | vlist->list[vlist->list_len++] = var; | |
3323 | vlist->list[vlist->list_len] = (SHELL_VAR *)NULL; | |
3324 | } | |
3325 | ||
3326 | /* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the | |
3327 | variables for which FUNCTION returns a non-zero value. A NULL value | |
3328 | for FUNCTION means to use all variables. */ | |
3329 | SHELL_VAR ** | |
3330 | map_over (function, vc) | |
3331 | sh_var_map_func_t *function; | |
3332 | VAR_CONTEXT *vc; | |
3333 | { | |
3334 | VAR_CONTEXT *v; | |
3335 | VARLIST *vlist; | |
3336 | SHELL_VAR **ret; | |
3337 | int nentries; | |
3338 | ||
3339 | for (nentries = 0, v = vc; v; v = v->down) | |
3340 | nentries += HASH_ENTRIES (v->table); | |
3341 | ||
3342 | if (nentries == 0) | |
3343 | return (SHELL_VAR **)NULL; | |
3344 | ||
3345 | vlist = vlist_alloc (nentries); | |
3346 | ||
3347 | for (v = vc; v; v = v->down) | |
3348 | flatten (v->table, function, vlist, 0); | |
3349 | ||
3350 | ret = vlist->list; | |
3351 | free (vlist); | |
3352 | return ret; | |
3353 | } | |
3354 | ||
3355 | SHELL_VAR ** | |
3356 | map_over_funcs (function) | |
3357 | sh_var_map_func_t *function; | |
3358 | { | |
3359 | VARLIST *vlist; | |
3360 | SHELL_VAR **ret; | |
3361 | ||
3362 | if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0) | |
3363 | return ((SHELL_VAR **)NULL); | |
3364 | ||
3365 | vlist = vlist_alloc (HASH_ENTRIES (shell_functions)); | |
3366 | ||
3367 | flatten (shell_functions, function, vlist, 0); | |
3368 | ||
3369 | ret = vlist->list; | |
3370 | free (vlist); | |
3371 | return ret; | |
3372 | } | |
3373 | ||
3374 | /* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those | |
3375 | elements for which FUNC succeeds to VLIST->list. FLAGS is reserved | |
3376 | for future use. Only unique names are added to VLIST. If FUNC is | |
3377 | NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is | |
3378 | NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST | |
3379 | and FUNC are both NULL, nothing happens. */ | |
3380 | static void | |
3381 | flatten (var_hash_table, func, vlist, flags) | |
3382 | HASH_TABLE *var_hash_table; | |
3383 | sh_var_map_func_t *func; | |
3384 | VARLIST *vlist; | |
3385 | int flags; | |
3386 | { | |
3387 | register int i; | |
3388 | register BUCKET_CONTENTS *tlist; | |
3389 | int r; | |
3390 | SHELL_VAR *var; | |
3391 | ||
3392 | if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0)) | |
3393 | return; | |
3394 | ||
3395 | for (i = 0; i < var_hash_table->nbuckets; i++) | |
3396 | { | |
3397 | for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next) | |
3398 | { | |
3399 | var = (SHELL_VAR *)tlist->data; | |
3400 | ||
3401 | r = func ? (*func) (var) : 1; | |
3402 | if (r && vlist) | |
3403 | vlist_add (vlist, var, flags); | |
3404 | } | |
3405 | } | |
3406 | } | |
3407 | ||
3408 | void | |
3409 | sort_variables (array) | |
3410 | SHELL_VAR **array; | |
3411 | { | |
3412 | qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp); | |
3413 | } | |
3414 | ||
3415 | static int | |
3416 | qsort_var_comp (var1, var2) | |
3417 | SHELL_VAR **var1, **var2; | |
3418 | { | |
3419 | int result; | |
3420 | ||
3421 | if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0) | |
3422 | result = strcmp ((*var1)->name, (*var2)->name); | |
3423 | ||
3424 | return (result); | |
3425 | } | |
3426 | ||
3427 | /* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for | |
3428 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
3429 | static SHELL_VAR ** | |
3430 | vapply (func) | |
3431 | sh_var_map_func_t *func; | |
3432 | { | |
3433 | SHELL_VAR **list; | |
3434 | ||
3435 | list = map_over (func, shell_variables); | |
3436 | if (list /* && posixly_correct */) | |
3437 | sort_variables (list); | |
3438 | return (list); | |
3439 | } | |
3440 | ||
3441 | /* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for | |
3442 | which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */ | |
3443 | static SHELL_VAR ** | |
3444 | fapply (func) | |
3445 | sh_var_map_func_t *func; | |
3446 | { | |
3447 | SHELL_VAR **list; | |
3448 | ||
3449 | list = map_over_funcs (func); | |
3450 | if (list /* && posixly_correct */) | |
3451 | sort_variables (list); | |
3452 | return (list); | |
3453 | } | |
3454 | ||
3455 | /* Create a NULL terminated array of all the shell variables. */ | |
3456 | SHELL_VAR ** | |
3457 | all_shell_variables () | |
3458 | { | |
3459 | return (vapply ((sh_var_map_func_t *)NULL)); | |
3460 | } | |
3461 | ||
3462 | /* Create a NULL terminated array of all the shell functions. */ | |
3463 | SHELL_VAR ** | |
3464 | all_shell_functions () | |
3465 | { | |
3466 | return (fapply ((sh_var_map_func_t *)NULL)); | |
3467 | } | |
3468 | ||
3469 | static int | |
3470 | visible_var (var) | |
3471 | SHELL_VAR *var; | |
3472 | { | |
3473 | return (invisible_p (var) == 0); | |
3474 | } | |
3475 | ||
3476 | SHELL_VAR ** | |
3477 | all_visible_functions () | |
3478 | { | |
3479 | return (fapply (visible_var)); | |
3480 | } | |
3481 | ||
3482 | SHELL_VAR ** | |
3483 | all_visible_variables () | |
3484 | { | |
3485 | return (vapply (visible_var)); | |
3486 | } | |
3487 | ||
3488 | /* Return non-zero if the variable VAR is visible and exported. Array | |
3489 | variables cannot be exported. */ | |
3490 | static int | |
3491 | visible_and_exported (var) | |
3492 | SHELL_VAR *var; | |
3493 | { | |
3494 | return (invisible_p (var) == 0 && exported_p (var)); | |
3495 | } | |
3496 | ||
3497 | /* Candidate variables for the export environment are either valid variables | |
3498 | with the export attribute or invalid variables inherited from the initial | |
3499 | environment and simply passed through. */ | |
3500 | static int | |
3501 | export_environment_candidate (var) | |
3502 | SHELL_VAR *var; | |
3503 | { | |
3504 | return (exported_p (var) && (invisible_p (var) == 0 || imported_p (var))); | |
3505 | } | |
3506 | ||
3507 | /* Return non-zero if VAR is a local variable in the current context and | |
3508 | is exported. */ | |
3509 | static int | |
3510 | local_and_exported (var) | |
3511 | SHELL_VAR *var; | |
3512 | { | |
3513 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var)); | |
3514 | } | |
3515 | ||
3516 | SHELL_VAR ** | |
3517 | all_exported_variables () | |
3518 | { | |
3519 | return (vapply (visible_and_exported)); | |
3520 | } | |
3521 | ||
3522 | SHELL_VAR ** | |
3523 | local_exported_variables () | |
3524 | { | |
3525 | return (vapply (local_and_exported)); | |
3526 | } | |
3527 | ||
3528 | static int | |
3529 | variable_in_context (var) | |
3530 | SHELL_VAR *var; | |
3531 | { | |
3532 | return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context); | |
3533 | } | |
3534 | ||
3535 | SHELL_VAR ** | |
3536 | all_local_variables () | |
3537 | { | |
3538 | VARLIST *vlist; | |
3539 | SHELL_VAR **ret; | |
3540 | VAR_CONTEXT *vc; | |
3541 | ||
3542 | vc = shell_variables; | |
3543 | for (vc = shell_variables; vc; vc = vc->down) | |
3544 | if (vc_isfuncenv (vc) && vc->scope == variable_context) | |
3545 | break; | |
3546 | ||
3547 | if (vc == 0) | |
3548 | { | |
3549 | internal_error (_("all_local_variables: no function context at current scope")); | |
3550 | return (SHELL_VAR **)NULL; | |
3551 | } | |
3552 | if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0) | |
3553 | return (SHELL_VAR **)NULL; | |
3554 | ||
3555 | vlist = vlist_alloc (HASH_ENTRIES (vc->table)); | |
3556 | ||
3557 | flatten (vc->table, variable_in_context, vlist, 0); | |
3558 | ||
3559 | ret = vlist->list; | |
3560 | free (vlist); | |
3561 | if (ret) | |
3562 | sort_variables (ret); | |
3563 | return ret; | |
3564 | } | |
3565 | ||
3566 | #if defined (ARRAY_VARS) | |
3567 | /* Return non-zero if the variable VAR is visible and an array. */ | |
3568 | static int | |
3569 | visible_array_vars (var) | |
3570 | SHELL_VAR *var; | |
3571 | { | |
3572 | return (invisible_p (var) == 0 && array_p (var)); | |
3573 | } | |
3574 | ||
3575 | SHELL_VAR ** | |
3576 | all_array_variables () | |
3577 | { | |
3578 | return (vapply (visible_array_vars)); | |
3579 | } | |
3580 | #endif /* ARRAY_VARS */ | |
3581 | ||
3582 | char ** | |
3583 | all_variables_matching_prefix (prefix) | |
3584 | const char *prefix; | |
3585 | { | |
3586 | SHELL_VAR **varlist; | |
3587 | char **rlist; | |
3588 | int vind, rind, plen; | |
3589 | ||
3590 | plen = STRLEN (prefix); | |
3591 | varlist = all_visible_variables (); | |
3592 | for (vind = 0; varlist && varlist[vind]; vind++) | |
3593 | ; | |
3594 | if (varlist == 0 || vind == 0) | |
3595 | return ((char **)NULL); | |
3596 | rlist = strvec_create (vind + 1); | |
3597 | for (vind = rind = 0; varlist[vind]; vind++) | |
3598 | { | |
3599 | if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen)) | |
3600 | rlist[rind++] = savestring (varlist[vind]->name); | |
3601 | } | |
3602 | rlist[rind] = (char *)0; | |
3603 | free (varlist); | |
3604 | ||
3605 | return rlist; | |
3606 | } | |
3607 | ||
3608 | /* **************************************************************** */ | |
3609 | /* */ | |
3610 | /* Managing temporary variable scopes */ | |
3611 | /* */ | |
3612 | /* **************************************************************** */ | |
3613 | ||
3614 | /* Make variable NAME have VALUE in the temporary environment. */ | |
3615 | static SHELL_VAR * | |
3616 | bind_tempenv_variable (name, value) | |
3617 | const char *name; | |
3618 | char *value; | |
3619 | { | |
3620 | SHELL_VAR *var; | |
3621 | ||
3622 | var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL; | |
3623 | ||
3624 | if (var) | |
3625 | { | |
3626 | FREE (value_cell (var)); | |
3627 | var_setvalue (var, savestring (value)); | |
3628 | INVALIDATE_EXPORTSTR (var); | |
3629 | } | |
3630 | ||
3631 | return (var); | |
3632 | } | |
3633 | ||
3634 | /* Find a variable in the temporary environment that is named NAME. | |
3635 | Return the SHELL_VAR *, or NULL if not found. */ | |
3636 | SHELL_VAR * | |
3637 | find_tempenv_variable (name) | |
3638 | const char *name; | |
3639 | { | |
3640 | return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL); | |
3641 | } | |
3642 | ||
3643 | char **tempvar_list; | |
3644 | int tvlist_ind; | |
3645 | ||
3646 | /* Push the variable described by (SHELL_VAR *)DATA down to the next | |
3647 | variable context from the temporary environment. */ | |
3648 | static void | |
3649 | push_temp_var (data) | |
3650 | PTR_T data; | |
3651 | { | |
3652 | SHELL_VAR *var, *v; | |
3653 | HASH_TABLE *binding_table; | |
3654 | ||
3655 | var = (SHELL_VAR *)data; | |
3656 | ||
3657 | binding_table = shell_variables->table; | |
3658 | if (binding_table == 0) | |
3659 | { | |
3660 | if (shell_variables == global_variables) | |
3661 | /* shouldn't happen */ | |
3662 | binding_table = shell_variables->table = global_variables->table = hash_create (0); | |
3663 | else | |
3664 | binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS); | |
3665 | } | |
3666 | ||
3667 | v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0); | |
3668 | ||
3669 | /* XXX - should we set the context here? It shouldn't matter because of how | |
3670 | assign_in_env works, but might want to check. */ | |
3671 | if (binding_table == global_variables->table) /* XXX */ | |
3672 | var->attributes &= ~(att_tempvar|att_propagate); | |
3673 | else | |
3674 | { | |
3675 | var->attributes |= att_propagate; | |
3676 | if (binding_table == shell_variables->table) | |
3677 | shell_variables->flags |= VC_HASTMPVAR; | |
3678 | } | |
3679 | v->attributes |= var->attributes; | |
3680 | ||
3681 | if (find_special_var (var->name) >= 0) | |
3682 | tempvar_list[tvlist_ind++] = savestring (var->name); | |
3683 | ||
3684 | dispose_variable (var); | |
3685 | } | |
3686 | ||
3687 | static void | |
3688 | propagate_temp_var (data) | |
3689 | PTR_T data; | |
3690 | { | |
3691 | SHELL_VAR *var; | |
3692 | ||
3693 | var = (SHELL_VAR *)data; | |
3694 | if (tempvar_p (var) && (var->attributes & att_propagate)) | |
3695 | push_temp_var (data); | |
3696 | else | |
3697 | { | |
3698 | if (find_special_var (var->name) >= 0) | |
3699 | tempvar_list[tvlist_ind++] = savestring (var->name); | |
3700 | dispose_variable (var); | |
3701 | } | |
3702 | } | |
3703 | ||
3704 | /* Free the storage used in the hash table for temporary | |
3705 | environment variables. PUSHF is a function to be called | |
3706 | to free each hash table entry. It takes care of pushing variables | |
3707 | to previous scopes if appropriate. PUSHF stores names of variables | |
3708 | that require special handling (e.g., IFS) on tempvar_list, so this | |
3709 | function can call stupidly_hack_special_variables on all the | |
3710 | variables in the list when the temporary hash table is destroyed. */ | |
3711 | static void | |
3712 | dispose_temporary_env (pushf) | |
3713 | sh_free_func_t *pushf; | |
3714 | { | |
3715 | int i; | |
3716 | ||
3717 | tempvar_list = strvec_create (HASH_ENTRIES (temporary_env) + 1); | |
3718 | tempvar_list[tvlist_ind = 0] = 0; | |
3719 | ||
3720 | hash_flush (temporary_env, pushf); | |
3721 | hash_dispose (temporary_env); | |
3722 | temporary_env = (HASH_TABLE *)NULL; | |
3723 | ||
3724 | tempvar_list[tvlist_ind] = 0; | |
3725 | ||
3726 | array_needs_making = 1; | |
3727 | ||
3728 | #if 0 | |
3729 | sv_ifs ("IFS"); /* XXX here for now -- check setifs in assign_in_env */ | |
3730 | #endif | |
3731 | for (i = 0; i < tvlist_ind; i++) | |
3732 | stupidly_hack_special_variables (tempvar_list[i]); | |
3733 | ||
3734 | strvec_dispose (tempvar_list); | |
3735 | tempvar_list = 0; | |
3736 | tvlist_ind = 0; | |
3737 | } | |
3738 | ||
3739 | void | |
3740 | dispose_used_env_vars () | |
3741 | { | |
3742 | if (temporary_env) | |
3743 | { | |
3744 | dispose_temporary_env (propagate_temp_var); | |
3745 | maybe_make_export_env (); | |
3746 | } | |
3747 | } | |
3748 | ||
3749 | /* Take all of the shell variables in the temporary environment HASH_TABLE | |
3750 | and make shell variables from them at the current variable context. */ | |
3751 | void | |
3752 | merge_temporary_env () | |
3753 | { | |
3754 | if (temporary_env) | |
3755 | dispose_temporary_env (push_temp_var); | |
3756 | } | |
3757 | ||
3758 | /* **************************************************************** */ | |
3759 | /* */ | |
3760 | /* Creating and manipulating the environment */ | |
3761 | /* */ | |
3762 | /* **************************************************************** */ | |
3763 | ||
3764 | static inline char * | |
3765 | mk_env_string (name, value) | |
3766 | const char *name, *value; | |
3767 | { | |
3768 | int name_len, value_len; | |
3769 | char *p; | |
3770 | ||
3771 | name_len = strlen (name); | |
3772 | value_len = STRLEN (value); | |
3773 | p = (char *)xmalloc (2 + name_len + value_len); | |
3774 | strcpy (p, name); | |
3775 | p[name_len] = '='; | |
3776 | if (value && *value) | |
3777 | strcpy (p + name_len + 1, value); | |
3778 | else | |
3779 | p[name_len + 1] = '\0'; | |
3780 | return (p); | |
3781 | } | |
3782 | ||
3783 | #ifdef DEBUG | |
3784 | /* Debugging */ | |
3785 | static int | |
3786 | valid_exportstr (v) | |
3787 | SHELL_VAR *v; | |
3788 | { | |
3789 | char *s; | |
3790 | ||
3791 | s = v->exportstr; | |
3792 | if (s == 0) | |
3793 | { | |
3794 | internal_error (_("%s has null exportstr"), v->name); | |
3795 | return (0); | |
3796 | } | |
3797 | if (legal_variable_starter ((unsigned char)*s) == 0) | |
3798 | { | |
3799 | internal_error (_("invalid character %d in exportstr for %s"), *s, v->name); | |
3800 | return (0); | |
3801 | } | |
3802 | for (s = v->exportstr + 1; s && *s; s++) | |
3803 | { | |
3804 | if (*s == '=') | |
3805 | break; | |
3806 | if (legal_variable_char ((unsigned char)*s) == 0) | |
3807 | { | |
3808 | internal_error (_("invalid character %d in exportstr for %s"), *s, v->name); | |
3809 | return (0); | |
3810 | } | |
3811 | } | |
3812 | if (*s != '=') | |
3813 | { | |
3814 | internal_error (_("no `=' in exportstr for %s"), v->name); | |
3815 | return (0); | |
3816 | } | |
3817 | return (1); | |
3818 | } | |
3819 | #endif | |
3820 | ||
3821 | static char ** | |
3822 | make_env_array_from_var_list (vars) | |
3823 | SHELL_VAR **vars; | |
3824 | { | |
3825 | register int i, list_index; | |
3826 | register SHELL_VAR *var; | |
3827 | char **list, *value; | |
3828 | ||
3829 | list = strvec_create ((1 + strvec_len ((char **)vars))); | |
3830 | ||
3831 | #define USE_EXPORTSTR (value == var->exportstr) | |
3832 | ||
3833 | for (i = 0, list_index = 0; var = vars[i]; i++) | |
3834 | { | |
3835 | #if defined (__CYGWIN__) | |
3836 | /* We don't use the exportstr stuff on Cygwin at all. */ | |
3837 | INVALIDATE_EXPORTSTR (var); | |
3838 | #endif | |
3839 | if (var->exportstr) | |
3840 | value = var->exportstr; | |
3841 | else if (function_p (var)) | |
3842 | value = named_function_string ((char *)NULL, function_cell (var), 0); | |
3843 | #if defined (ARRAY_VARS) | |
3844 | else if (array_p (var)) | |
3845 | # if ARRAY_EXPORT | |
3846 | value = array_to_assignment_string (array_cell (var)); | |
3847 | # else | |
3848 | continue; /* XXX array vars cannot yet be exported */ | |
3849 | # endif /* ARRAY_EXPORT */ | |
3850 | else if (assoc_p (var)) | |
3851 | # if 0 | |
3852 | value = assoc_to_assignment_string (assoc_cell (var)); | |
3853 | # else | |
3854 | continue; /* XXX associative array vars cannot yet be exported */ | |
3855 | # endif | |
3856 | #endif | |
3857 | else | |
3858 | value = value_cell (var); | |
3859 | ||
3860 | if (value) | |
3861 | { | |
3862 | /* Gee, I'd like to get away with not using savestring() if we're | |
3863 | using the cached exportstr... */ | |
3864 | list[list_index] = USE_EXPORTSTR ? savestring (value) | |
3865 | : mk_env_string (var->name, value); | |
3866 | ||
3867 | if (USE_EXPORTSTR == 0) | |
3868 | SAVE_EXPORTSTR (var, list[list_index]); | |
3869 | ||
3870 | list_index++; | |
3871 | #undef USE_EXPORTSTR | |
3872 | ||
3873 | #if 0 /* not yet */ | |
3874 | #if defined (ARRAY_VARS) | |
3875 | if (array_p (var) || assoc_p (var)) | |
3876 | free (value); | |
3877 | #endif | |
3878 | #endif | |
3879 | } | |
3880 | } | |
3881 | ||
3882 | list[list_index] = (char *)NULL; | |
3883 | return (list); | |
3884 | } | |
3885 | ||
3886 | /* Make an array of assignment statements from the hash table | |
3887 | HASHED_VARS which contains SHELL_VARs. Only visible, exported | |
3888 | variables are eligible. */ | |
3889 | static char ** | |
3890 | make_var_export_array (vcxt) | |
3891 | VAR_CONTEXT *vcxt; | |
3892 | { | |
3893 | char **list; | |
3894 | SHELL_VAR **vars; | |
3895 | ||
3896 | #if 0 | |
3897 | vars = map_over (visible_and_exported, vcxt); | |
3898 | #else | |
3899 | vars = map_over (export_environment_candidate, vcxt); | |
3900 | #endif | |
3901 | ||
3902 | if (vars == 0) | |
3903 | return (char **)NULL; | |
3904 | ||
3905 | list = make_env_array_from_var_list (vars); | |
3906 | ||
3907 | free (vars); | |
3908 | return (list); | |
3909 | } | |
3910 | ||
3911 | static char ** | |
3912 | make_func_export_array () | |
3913 | { | |
3914 | char **list; | |
3915 | SHELL_VAR **vars; | |
3916 | ||
3917 | vars = map_over_funcs (visible_and_exported); | |
3918 | if (vars == 0) | |
3919 | return (char **)NULL; | |
3920 | ||
3921 | list = make_env_array_from_var_list (vars); | |
3922 | ||
3923 | free (vars); | |
3924 | return (list); | |
3925 | } | |
3926 | ||
3927 | /* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */ | |
3928 | #define add_to_export_env(envstr,do_alloc) \ | |
3929 | do \ | |
3930 | { \ | |
3931 | if (export_env_index >= (export_env_size - 1)) \ | |
3932 | { \ | |
3933 | export_env_size += 16; \ | |
3934 | export_env = strvec_resize (export_env, export_env_size); \ | |
3935 | environ = export_env; \ | |
3936 | } \ | |
3937 | export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \ | |
3938 | export_env[export_env_index] = (char *)NULL; \ | |
3939 | } while (0) | |
3940 | ||
3941 | /* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the | |
3942 | array with the same left-hand side. Return the new EXPORT_ENV. */ | |
3943 | char ** | |
3944 | add_or_supercede_exported_var (assign, do_alloc) | |
3945 | char *assign; | |
3946 | int do_alloc; | |
3947 | { | |
3948 | register int i; | |
3949 | int equal_offset; | |
3950 | ||
3951 | equal_offset = assignment (assign, 0); | |
3952 | if (equal_offset == 0) | |
3953 | return (export_env); | |
3954 | ||
3955 | /* If this is a function, then only supersede the function definition. | |
3956 | We do this by including the `=() {' in the comparison, like | |
3957 | initialize_shell_variables does. */ | |
3958 | if (assign[equal_offset + 1] == '(' && | |
3959 | strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */ | |
3960 | equal_offset += 4; | |
3961 | ||
3962 | for (i = 0; i < export_env_index; i++) | |
3963 | { | |
3964 | if (STREQN (assign, export_env[i], equal_offset + 1)) | |
3965 | { | |
3966 | free (export_env[i]); | |
3967 | export_env[i] = do_alloc ? savestring (assign) : assign; | |
3968 | return (export_env); | |
3969 | } | |
3970 | } | |
3971 | add_to_export_env (assign, do_alloc); | |
3972 | return (export_env); | |
3973 | } | |
3974 | ||
3975 | static void | |
3976 | add_temp_array_to_env (temp_array, do_alloc, do_supercede) | |
3977 | char **temp_array; | |
3978 | int do_alloc, do_supercede; | |
3979 | { | |
3980 | register int i; | |
3981 | ||
3982 | if (temp_array == 0) | |
3983 | return; | |
3984 | ||
3985 | for (i = 0; temp_array[i]; i++) | |
3986 | { | |
3987 | if (do_supercede) | |
3988 | export_env = add_or_supercede_exported_var (temp_array[i], do_alloc); | |
3989 | else | |
3990 | add_to_export_env (temp_array[i], do_alloc); | |
3991 | } | |
3992 | ||
3993 | free (temp_array); | |
3994 | } | |
3995 | ||
3996 | /* Make the environment array for the command about to be executed, if the | |
3997 | array needs making. Otherwise, do nothing. If a shell action could | |
3998 | change the array that commands receive for their environment, then the | |
3999 | code should `array_needs_making++'. | |
4000 | ||
4001 | The order to add to the array is: | |
4002 | temporary_env | |
4003 | list of var contexts whose head is shell_variables | |
4004 | shell_functions | |
4005 | ||
4006 | This is the shell variable lookup order. We add only new variable | |
4007 | names at each step, which allows local variables and variables in | |
4008 | the temporary environments to shadow variables in the global (or | |
4009 | any previous) scope. | |
4010 | */ | |
4011 | ||
4012 | static int | |
4013 | n_shell_variables () | |
4014 | { | |
4015 | VAR_CONTEXT *vc; | |
4016 | int n; | |
4017 | ||
4018 | for (n = 0, vc = shell_variables; vc; vc = vc->down) | |
4019 | n += HASH_ENTRIES (vc->table); | |
4020 | return n; | |
4021 | } | |
4022 | ||
4023 | int | |
4024 | chkexport (name) | |
4025 | char *name; | |
4026 | { | |
4027 | SHELL_VAR *v; | |
4028 | ||
4029 | v = find_variable (name); | |
4030 | if (v && exported_p (v)) | |
4031 | { | |
4032 | array_needs_making = 1; | |
4033 | maybe_make_export_env (); | |
4034 | return 1; | |
4035 | } | |
4036 | return 0; | |
4037 | } | |
4038 | ||
4039 | void | |
4040 | maybe_make_export_env () | |
4041 | { | |
4042 | register char **temp_array; | |
4043 | int new_size; | |
4044 | VAR_CONTEXT *tcxt; | |
4045 | ||
4046 | if (array_needs_making) | |
4047 | { | |
4048 | if (export_env) | |
4049 | strvec_flush (export_env); | |
4050 | ||
4051 | /* Make a guess based on how many shell variables and functions we | |
4052 | have. Since there will always be array variables, and array | |
4053 | variables are not (yet) exported, this will always be big enough | |
4054 | for the exported variables and functions. */ | |
4055 | new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 + | |
4056 | HASH_ENTRIES (temporary_env); | |
4057 | if (new_size > export_env_size) | |
4058 | { | |
4059 | export_env_size = new_size; | |
4060 | export_env = strvec_resize (export_env, export_env_size); | |
4061 | environ = export_env; | |
4062 | } | |
4063 | export_env[export_env_index = 0] = (char *)NULL; | |
4064 | ||
4065 | /* Make a dummy variable context from the temporary_env, stick it on | |
4066 | the front of shell_variables, call make_var_export_array on the | |
4067 | whole thing to flatten it, and convert the list of SHELL_VAR *s | |
4068 | to the form needed by the environment. */ | |
4069 | if (temporary_env) | |
4070 | { | |
4071 | tcxt = new_var_context ((char *)NULL, 0); | |
4072 | tcxt->table = temporary_env; | |
4073 | tcxt->down = shell_variables; | |
4074 | } | |
4075 | else | |
4076 | tcxt = shell_variables; | |
4077 | ||
4078 | temp_array = make_var_export_array (tcxt); | |
4079 | if (temp_array) | |
4080 | add_temp_array_to_env (temp_array, 0, 0); | |
4081 | ||
4082 | if (tcxt != shell_variables) | |
4083 | free (tcxt); | |
4084 | ||
4085 | #if defined (RESTRICTED_SHELL) | |
4086 | /* Restricted shells may not export shell functions. */ | |
4087 | temp_array = restricted ? (char **)0 : make_func_export_array (); | |
4088 | #else | |
4089 | temp_array = make_func_export_array (); | |
4090 | #endif | |
4091 | if (temp_array) | |
4092 | add_temp_array_to_env (temp_array, 0, 0); | |
4093 | ||
4094 | array_needs_making = 0; | |
4095 | } | |
4096 | } | |
4097 | ||
4098 | /* This is an efficiency hack. PWD and OLDPWD are auto-exported, so | |
4099 | we will need to remake the exported environment every time we | |
4100 | change directories. `_' is always put into the environment for | |
4101 | every external command, so without special treatment it will always | |
4102 | cause the environment to be remade. | |
4103 | ||
4104 | If there is no other reason to make the exported environment, we can | |
4105 | just update the variables in place and mark the exported environment | |
4106 | as no longer needing a remake. */ | |
4107 | void | |
4108 | update_export_env_inplace (env_prefix, preflen, value) | |
4109 | char *env_prefix; | |
4110 | int preflen; | |
4111 | char *value; | |
4112 | { | |
4113 | char *evar; | |
4114 | ||
4115 | evar = (char *)xmalloc (STRLEN (value) + preflen + 1); | |
4116 | strcpy (evar, env_prefix); | |
4117 | if (value) | |
4118 | strcpy (evar + preflen, value); | |
4119 | export_env = add_or_supercede_exported_var (evar, 0); | |
4120 | } | |
4121 | ||
4122 | /* We always put _ in the environment as the name of this command. */ | |
4123 | void | |
4124 | put_command_name_into_env (command_name) | |
4125 | char *command_name; | |
4126 | { | |
4127 | update_export_env_inplace ("_=", 2, command_name); | |
4128 | } | |
4129 | ||
4130 | /* **************************************************************** */ | |
4131 | /* */ | |
4132 | /* Managing variable contexts */ | |
4133 | /* */ | |
4134 | /* **************************************************************** */ | |
4135 | ||
4136 | /* Allocate and return a new variable context with NAME and FLAGS. | |
4137 | NAME can be NULL. */ | |
4138 | ||
4139 | VAR_CONTEXT * | |
4140 | new_var_context (name, flags) | |
4141 | char *name; | |
4142 | int flags; | |
4143 | { | |
4144 | VAR_CONTEXT *vc; | |
4145 | ||
4146 | vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT)); | |
4147 | vc->name = name ? savestring (name) : (char *)NULL; | |
4148 | vc->scope = variable_context; | |
4149 | vc->flags = flags; | |
4150 | ||
4151 | vc->up = vc->down = (VAR_CONTEXT *)NULL; | |
4152 | vc->table = (HASH_TABLE *)NULL; | |
4153 | ||
4154 | return vc; | |
4155 | } | |
4156 | ||
4157 | /* Free a variable context and its data, including the hash table. Dispose | |
4158 | all of the variables. */ | |
4159 | void | |
4160 | dispose_var_context (vc) | |
4161 | VAR_CONTEXT *vc; | |
4162 | { | |
4163 | FREE (vc->name); | |
4164 | ||
4165 | if (vc->table) | |
4166 | { | |
4167 | delete_all_variables (vc->table); | |
4168 | hash_dispose (vc->table); | |
4169 | } | |
4170 | ||
4171 | free (vc); | |
4172 | } | |
4173 | ||
4174 | /* Set VAR's scope level to the current variable context. */ | |
4175 | static int | |
4176 | set_context (var) | |
4177 | SHELL_VAR *var; | |
4178 | { | |
4179 | return (var->context = variable_context); | |
4180 | } | |
4181 | ||
4182 | /* Make a new variable context with NAME and FLAGS and a HASH_TABLE of | |
4183 | temporary variables, and push it onto shell_variables. This is | |
4184 | for shell functions. */ | |
4185 | VAR_CONTEXT * | |
4186 | push_var_context (name, flags, tempvars) | |
4187 | char *name; | |
4188 | int flags; | |
4189 | HASH_TABLE *tempvars; | |
4190 | { | |
4191 | VAR_CONTEXT *vc; | |
4192 | ||
4193 | vc = new_var_context (name, flags); | |
4194 | vc->table = tempvars; | |
4195 | if (tempvars) | |
4196 | { | |
4197 | /* Have to do this because the temp environment was created before | |
4198 | variable_context was incremented. */ | |
4199 | flatten (tempvars, set_context, (VARLIST *)NULL, 0); | |
4200 | vc->flags |= VC_HASTMPVAR; | |
4201 | } | |
4202 | vc->down = shell_variables; | |
4203 | shell_variables->up = vc; | |
4204 | ||
4205 | return (shell_variables = vc); | |
4206 | } | |
4207 | ||
4208 | static void | |
4209 | push_func_var (data) | |
4210 | PTR_T data; | |
4211 | { | |
4212 | SHELL_VAR *var, *v; | |
4213 | ||
4214 | var = (SHELL_VAR *)data; | |
4215 | ||
4216 | if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate))) | |
4217 | { | |
4218 | /* Make sure we have a hash table to store the variable in while it is | |
4219 | being propagated down to the global variables table. Create one if | |
4220 | we have to */ | |
4221 | if ((vc_isfuncenv (shell_variables) || vc_istempenv (shell_variables)) && shell_variables->table == 0) | |
4222 | shell_variables->table = hash_create (0); | |
4223 | /* XXX - should we set v->context here? */ | |
4224 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0); | |
4225 | if (shell_variables == global_variables) | |
4226 | var->attributes &= ~(att_tempvar|att_propagate); | |
4227 | else | |
4228 | shell_variables->flags |= VC_HASTMPVAR; | |
4229 | v->attributes |= var->attributes; | |
4230 | } | |
4231 | else | |
4232 | stupidly_hack_special_variables (var->name); /* XXX */ | |
4233 | ||
4234 | dispose_variable (var); | |
4235 | } | |
4236 | ||
4237 | /* Pop the top context off of VCXT and dispose of it, returning the rest of | |
4238 | the stack. */ | |
4239 | void | |
4240 | pop_var_context () | |
4241 | { | |
4242 | VAR_CONTEXT *ret, *vcxt; | |
4243 | ||
4244 | vcxt = shell_variables; | |
4245 | if (vc_isfuncenv (vcxt) == 0) | |
4246 | { | |
4247 | internal_error (_("pop_var_context: head of shell_variables not a function context")); | |
4248 | return; | |
4249 | } | |
4250 | ||
4251 | if (ret = vcxt->down) | |
4252 | { | |
4253 | ret->up = (VAR_CONTEXT *)NULL; | |
4254 | shell_variables = ret; | |
4255 | if (vcxt->table) | |
4256 | hash_flush (vcxt->table, push_func_var); | |
4257 | dispose_var_context (vcxt); | |
4258 | } | |
4259 | else | |
4260 | internal_error (_("pop_var_context: no global_variables context")); | |
4261 | } | |
4262 | ||
4263 | /* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and | |
4264 | all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */ | |
4265 | void | |
4266 | delete_all_contexts (vcxt) | |
4267 | VAR_CONTEXT *vcxt; | |
4268 | { | |
4269 | VAR_CONTEXT *v, *t; | |
4270 | ||
4271 | for (v = vcxt; v != global_variables; v = t) | |
4272 | { | |
4273 | t = v->down; | |
4274 | dispose_var_context (v); | |
4275 | } | |
4276 | ||
4277 | delete_all_variables (global_variables->table); | |
4278 | shell_variables = global_variables; | |
4279 | } | |
4280 | ||
4281 | /* **************************************************************** */ | |
4282 | /* */ | |
4283 | /* Pushing and Popping temporary variable scopes */ | |
4284 | /* */ | |
4285 | /* **************************************************************** */ | |
4286 | ||
4287 | VAR_CONTEXT * | |
4288 | push_scope (flags, tmpvars) | |
4289 | int flags; | |
4290 | HASH_TABLE *tmpvars; | |
4291 | { | |
4292 | return (push_var_context ((char *)NULL, flags, tmpvars)); | |
4293 | } | |
4294 | ||
4295 | static void | |
4296 | push_exported_var (data) | |
4297 | PTR_T data; | |
4298 | { | |
4299 | SHELL_VAR *var, *v; | |
4300 | ||
4301 | var = (SHELL_VAR *)data; | |
4302 | ||
4303 | /* If a temp var had its export attribute set, or it's marked to be | |
4304 | propagated, bind it in the previous scope before disposing it. */ | |
4305 | /* XXX - This isn't exactly right, because all tempenv variables have the | |
4306 | export attribute set. */ | |
4307 | #if 0 | |
4308 | if (exported_p (var) || (var->attributes & att_propagate)) | |
4309 | #else | |
4310 | if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate)) | |
4311 | #endif | |
4312 | { | |
4313 | var->attributes &= ~att_tempvar; /* XXX */ | |
4314 | v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0); | |
4315 | if (shell_variables == global_variables) | |
4316 | var->attributes &= ~att_propagate; | |
4317 | v->attributes |= var->attributes; | |
4318 | } | |
4319 | else | |
4320 | stupidly_hack_special_variables (var->name); /* XXX */ | |
4321 | ||
4322 | dispose_variable (var); | |
4323 | } | |
4324 | ||
4325 | void | |
4326 | pop_scope (is_special) | |
4327 | int is_special; | |
4328 | { | |
4329 | VAR_CONTEXT *vcxt, *ret; | |
4330 | ||
4331 | vcxt = shell_variables; | |
4332 | if (vc_istempscope (vcxt) == 0) | |
4333 | { | |
4334 | internal_error (_("pop_scope: head of shell_variables not a temporary environment scope")); | |
4335 | return; | |
4336 | } | |
4337 | ||
4338 | ret = vcxt->down; | |
4339 | if (ret) | |
4340 | ret->up = (VAR_CONTEXT *)NULL; | |
4341 | ||
4342 | shell_variables = ret; | |
4343 | ||
4344 | /* Now we can take care of merging variables in VCXT into set of scopes | |
4345 | whose head is RET (shell_variables). */ | |
4346 | FREE (vcxt->name); | |
4347 | if (vcxt->table) | |
4348 | { | |
4349 | if (is_special) | |
4350 | hash_flush (vcxt->table, push_func_var); | |
4351 | else | |
4352 | hash_flush (vcxt->table, push_exported_var); | |
4353 | hash_dispose (vcxt->table); | |
4354 | } | |
4355 | free (vcxt); | |
4356 | ||
4357 | sv_ifs ("IFS"); /* XXX here for now */ | |
4358 | } | |
4359 | ||
4360 | /* **************************************************************** */ | |
4361 | /* */ | |
4362 | /* Pushing and Popping function contexts */ | |
4363 | /* */ | |
4364 | /* **************************************************************** */ | |
4365 | ||
4366 | static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL; | |
4367 | static int dollar_arg_stack_slots; | |
4368 | static int dollar_arg_stack_index; | |
4369 | ||
4370 | /* XXX - we might want to consider pushing and popping the `getopts' state | |
4371 | when we modify the positional parameters. */ | |
4372 | void | |
4373 | push_context (name, is_subshell, tempvars) | |
4374 | char *name; /* function name */ | |
4375 | int is_subshell; | |
4376 | HASH_TABLE *tempvars; | |
4377 | { | |
4378 | if (is_subshell == 0) | |
4379 | push_dollar_vars (); | |
4380 | variable_context++; | |
4381 | push_var_context (name, VC_FUNCENV, tempvars); | |
4382 | } | |
4383 | ||
4384 | /* Only called when subshell == 0, so we don't need to check, and can | |
4385 | unconditionally pop the dollar vars off the stack. */ | |
4386 | void | |
4387 | pop_context () | |
4388 | { | |
4389 | pop_dollar_vars (); | |
4390 | variable_context--; | |
4391 | pop_var_context (); | |
4392 | ||
4393 | sv_ifs ("IFS"); /* XXX here for now */ | |
4394 | } | |
4395 | ||
4396 | /* Save the existing positional parameters on a stack. */ | |
4397 | void | |
4398 | push_dollar_vars () | |
4399 | { | |
4400 | if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots) | |
4401 | { | |
4402 | dollar_arg_stack = (WORD_LIST **) | |
4403 | xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10) | |
4404 | * sizeof (WORD_LIST *)); | |
4405 | } | |
4406 | dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args (); | |
4407 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
4408 | } | |
4409 | ||
4410 | /* Restore the positional parameters from our stack. */ | |
4411 | void | |
4412 | pop_dollar_vars () | |
4413 | { | |
4414 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
4415 | return; | |
4416 | ||
4417 | remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1); | |
4418 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); | |
4419 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
4420 | set_dollar_vars_unchanged (); | |
4421 | } | |
4422 | ||
4423 | void | |
4424 | dispose_saved_dollar_vars () | |
4425 | { | |
4426 | if (!dollar_arg_stack || dollar_arg_stack_index == 0) | |
4427 | return; | |
4428 | ||
4429 | dispose_words (dollar_arg_stack[dollar_arg_stack_index]); | |
4430 | dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL; | |
4431 | } | |
4432 | ||
4433 | /* Manipulate the special BASH_ARGV and BASH_ARGC variables. */ | |
4434 | ||
4435 | void | |
4436 | push_args (list) | |
4437 | WORD_LIST *list; | |
4438 | { | |
4439 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
4440 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
4441 | ARRAY *bash_argv_a, *bash_argc_a; | |
4442 | WORD_LIST *l; | |
4443 | arrayind_t i; | |
4444 | char *t; | |
4445 | ||
4446 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
4447 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
4448 | ||
4449 | for (l = list, i = 0; l; l = l->next, i++) | |
4450 | array_push (bash_argv_a, l->word->word); | |
4451 | ||
4452 | t = itos (i); | |
4453 | array_push (bash_argc_a, t); | |
4454 | free (t); | |
4455 | #endif /* ARRAY_VARS && DEBUGGER */ | |
4456 | } | |
4457 | ||
4458 | /* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC | |
4459 | array and use that value as the count of elements to remove from | |
4460 | BASH_ARGV. */ | |
4461 | void | |
4462 | pop_args () | |
4463 | { | |
4464 | #if defined (ARRAY_VARS) && defined (DEBUGGER) | |
4465 | SHELL_VAR *bash_argv_v, *bash_argc_v; | |
4466 | ARRAY *bash_argv_a, *bash_argc_a; | |
4467 | ARRAY_ELEMENT *ce; | |
4468 | intmax_t i; | |
4469 | ||
4470 | GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a); | |
4471 | GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a); | |
4472 | ||
4473 | ce = array_shift (bash_argc_a, 1, 0); | |
4474 | if (ce == 0 || legal_number (element_value (ce), &i) == 0) | |
4475 | i = 0; | |
4476 | ||
4477 | for ( ; i > 0; i--) | |
4478 | array_pop (bash_argv_a); | |
4479 | array_dispose_element (ce); | |
4480 | #endif /* ARRAY_VARS && DEBUGGER */ | |
4481 | } | |
4482 | ||
4483 | /************************************************* | |
4484 | * * | |
4485 | * Functions to manage special variables * | |
4486 | * * | |
4487 | *************************************************/ | |
4488 | ||
4489 | /* Extern declarations for variables this code has to manage. */ | |
4490 | extern int eof_encountered, eof_encountered_limit, ignoreeof; | |
4491 | ||
4492 | #if defined (READLINE) | |
4493 | extern int hostname_list_initialized; | |
4494 | #endif | |
4495 | ||
4496 | /* An alist of name.function for each special variable. Most of the | |
4497 | functions don't do much, and in fact, this would be faster with a | |
4498 | switch statement, but by the end of this file, I am sick of switch | |
4499 | statements. */ | |
4500 | ||
4501 | #define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0 | |
4502 | ||
4503 | /* This table will be sorted with qsort() the first time it's accessed. */ | |
4504 | struct name_and_function { | |
4505 | char *name; | |
4506 | sh_sv_func_t *function; | |
4507 | }; | |
4508 | ||
4509 | static struct name_and_function special_vars[] = { | |
4510 | { "BASH_COMPAT", sv_shcompat }, | |
4511 | { "BASH_XTRACEFD", sv_xtracefd }, | |
4512 | ||
4513 | #if defined (JOB_CONTROL) | |
4514 | { "CHILD_MAX", sv_childmax }, | |
4515 | #endif | |
4516 | ||
4517 | #if defined (READLINE) | |
4518 | # if defined (STRICT_POSIX) | |
4519 | { "COLUMNS", sv_winsize }, | |
4520 | # endif | |
4521 | { "COMP_WORDBREAKS", sv_comp_wordbreaks }, | |
4522 | #endif | |
4523 | ||
4524 | { "FUNCNEST", sv_funcnest }, | |
4525 | ||
4526 | { "GLOBIGNORE", sv_globignore }, | |
4527 | ||
4528 | #if defined (HISTORY) | |
4529 | { "HISTCONTROL", sv_history_control }, | |
4530 | { "HISTFILESIZE", sv_histsize }, | |
4531 | { "HISTIGNORE", sv_histignore }, | |
4532 | { "HISTSIZE", sv_histsize }, | |
4533 | { "HISTTIMEFORMAT", sv_histtimefmt }, | |
4534 | #endif | |
4535 | ||
4536 | #if defined (__CYGWIN__) | |
4537 | { "HOME", sv_home }, | |
4538 | #endif | |
4539 | ||
4540 | #if defined (READLINE) | |
4541 | { "HOSTFILE", sv_hostfile }, | |
4542 | #endif | |
4543 | ||
4544 | { "IFS", sv_ifs }, | |
4545 | { "IGNOREEOF", sv_ignoreeof }, | |
4546 | ||
4547 | { "LANG", sv_locale }, | |
4548 | { "LC_ALL", sv_locale }, | |
4549 | { "LC_COLLATE", sv_locale }, | |
4550 | { "LC_CTYPE", sv_locale }, | |
4551 | { "LC_MESSAGES", sv_locale }, | |
4552 | { "LC_NUMERIC", sv_locale }, | |
4553 | { "LC_TIME", sv_locale }, | |
4554 | ||
4555 | #if defined (READLINE) && defined (STRICT_POSIX) | |
4556 | { "LINES", sv_winsize }, | |
4557 | #endif | |
4558 | ||
4559 | { "MAIL", sv_mail }, | |
4560 | { "MAILCHECK", sv_mail }, | |
4561 | { "MAILPATH", sv_mail }, | |
4562 | ||
4563 | { "OPTERR", sv_opterr }, | |
4564 | { "OPTIND", sv_optind }, | |
4565 | ||
4566 | { "PATH", sv_path }, | |
4567 | { "POSIXLY_CORRECT", sv_strict_posix }, | |
4568 | ||
4569 | #if defined (READLINE) | |
4570 | { "TERM", sv_terminal }, | |
4571 | { "TERMCAP", sv_terminal }, | |
4572 | { "TERMINFO", sv_terminal }, | |
4573 | #endif /* READLINE */ | |
4574 | ||
4575 | { "TEXTDOMAIN", sv_locale }, | |
4576 | { "TEXTDOMAINDIR", sv_locale }, | |
4577 | ||
4578 | #if defined (HAVE_TZSET) | |
4579 | { "TZ", sv_tz }, | |
4580 | #endif | |
4581 | ||
4582 | #if defined (HISTORY) && defined (BANG_HISTORY) | |
4583 | { "histchars", sv_histchars }, | |
4584 | #endif /* HISTORY && BANG_HISTORY */ | |
4585 | ||
4586 | { "ignoreeof", sv_ignoreeof }, | |
4587 | ||
4588 | { (char *)0, (sh_sv_func_t *)0 } | |
4589 | }; | |
4590 | ||
4591 | #define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1) | |
4592 | ||
4593 | static int | |
4594 | sv_compare (sv1, sv2) | |
4595 | struct name_and_function *sv1, *sv2; | |
4596 | { | |
4597 | int r; | |
4598 | ||
4599 | if ((r = sv1->name[0] - sv2->name[0]) == 0) | |
4600 | r = strcmp (sv1->name, sv2->name); | |
4601 | return r; | |
4602 | } | |
4603 | ||
4604 | static inline int | |
4605 | find_special_var (name) | |
4606 | const char *name; | |
4607 | { | |
4608 | register int i, r; | |
4609 | ||
4610 | for (i = 0; special_vars[i].name; i++) | |
4611 | { | |
4612 | r = special_vars[i].name[0] - name[0]; | |
4613 | if (r == 0) | |
4614 | r = strcmp (special_vars[i].name, name); | |
4615 | if (r == 0) | |
4616 | return i; | |
4617 | else if (r > 0) | |
4618 | /* Can't match any of rest of elements in sorted list. Take this out | |
4619 | if it causes problems in certain environments. */ | |
4620 | break; | |
4621 | } | |
4622 | return -1; | |
4623 | } | |
4624 | ||
4625 | /* The variable in NAME has just had its state changed. Check to see if it | |
4626 | is one of the special ones where something special happens. */ | |
4627 | void | |
4628 | stupidly_hack_special_variables (name) | |
4629 | char *name; | |
4630 | { | |
4631 | static int sv_sorted = 0; | |
4632 | int i; | |
4633 | ||
4634 | if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */ | |
4635 | { | |
4636 | qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]), | |
4637 | (QSFUNC *)sv_compare); | |
4638 | sv_sorted = 1; | |
4639 | } | |
4640 | ||
4641 | i = find_special_var (name); | |
4642 | if (i != -1) | |
4643 | (*(special_vars[i].function)) (name); | |
4644 | } | |
4645 | ||
4646 | /* Special variables that need hooks to be run when they are unset as part | |
4647 | of shell reinitialization should have their sv_ functions run here. */ | |
4648 | void | |
4649 | reinit_special_variables () | |
4650 | { | |
4651 | #if defined (READLINE) | |
4652 | sv_comp_wordbreaks ("COMP_WORDBREAKS"); | |
4653 | #endif | |
4654 | sv_globignore ("GLOBIGNORE"); | |
4655 | sv_opterr ("OPTERR"); | |
4656 | } | |
4657 | ||
4658 | void | |
4659 | sv_ifs (name) | |
4660 | char *name; | |
4661 | { | |
4662 | SHELL_VAR *v; | |
4663 | ||
4664 | v = find_variable ("IFS"); | |
4665 | setifs (v); | |
4666 | } | |
4667 | ||
4668 | /* What to do just after the PATH variable has changed. */ | |
4669 | void | |
4670 | sv_path (name) | |
4671 | char *name; | |
4672 | { | |
4673 | /* hash -r */ | |
4674 | phash_flush (); | |
4675 | } | |
4676 | ||
4677 | /* What to do just after one of the MAILxxxx variables has changed. NAME | |
4678 | is the name of the variable. This is called with NAME set to one of | |
4679 | MAIL, MAILCHECK, or MAILPATH. */ | |
4680 | void | |
4681 | sv_mail (name) | |
4682 | char *name; | |
4683 | { | |
4684 | /* If the time interval for checking the files has changed, then | |
4685 | reset the mail timer. Otherwise, one of the pathname vars | |
4686 | to the users mailbox has changed, so rebuild the array of | |
4687 | filenames. */ | |
4688 | if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */ | |
4689 | reset_mail_timer (); | |
4690 | else | |
4691 | { | |
4692 | free_mail_files (); | |
4693 | remember_mail_dates (); | |
4694 | } | |
4695 | } | |
4696 | ||
4697 | void | |
4698 | sv_funcnest (name) | |
4699 | char *name; | |
4700 | { | |
4701 | SHELL_VAR *v; | |
4702 | intmax_t num; | |
4703 | ||
4704 | v = find_variable (name); | |
4705 | if (v == 0) | |
4706 | funcnest_max = 0; | |
4707 | else if (legal_number (value_cell (v), &num) == 0) | |
4708 | funcnest_max = 0; | |
4709 | else | |
4710 | funcnest_max = num; | |
4711 | } | |
4712 | ||
4713 | /* What to do when GLOBIGNORE changes. */ | |
4714 | void | |
4715 | sv_globignore (name) | |
4716 | char *name; | |
4717 | { | |
4718 | if (privileged_mode == 0) | |
4719 | setup_glob_ignore (name); | |
4720 | } | |
4721 | ||
4722 | #if defined (READLINE) | |
4723 | void | |
4724 | sv_comp_wordbreaks (name) | |
4725 | char *name; | |
4726 | { | |
4727 | SHELL_VAR *sv; | |
4728 | ||
4729 | sv = find_variable (name); | |
4730 | if (sv == 0) | |
4731 | reset_completer_word_break_chars (); | |
4732 | } | |
4733 | ||
4734 | /* What to do just after one of the TERMxxx variables has changed. | |
4735 | If we are an interactive shell, then try to reset the terminal | |
4736 | information in readline. */ | |
4737 | void | |
4738 | sv_terminal (name) | |
4739 | char *name; | |
4740 | { | |
4741 | if (interactive_shell && no_line_editing == 0) | |
4742 | rl_reset_terminal (get_string_value ("TERM")); | |
4743 | } | |
4744 | ||
4745 | void | |
4746 | sv_hostfile (name) | |
4747 | char *name; | |
4748 | { | |
4749 | SHELL_VAR *v; | |
4750 | ||
4751 | v = find_variable (name); | |
4752 | if (v == 0) | |
4753 | clear_hostname_list (); | |
4754 | else | |
4755 | hostname_list_initialized = 0; | |
4756 | } | |
4757 | ||
4758 | #if defined (STRICT_POSIX) | |
4759 | /* In strict posix mode, we allow assignments to LINES and COLUMNS (and values | |
4760 | found in the initial environment) to override the terminal size reported by | |
4761 | the kernel. */ | |
4762 | void | |
4763 | sv_winsize (name) | |
4764 | char *name; | |
4765 | { | |
4766 | SHELL_VAR *v; | |
4767 | intmax_t xd; | |
4768 | int d; | |
4769 | ||
4770 | if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing) | |
4771 | return; | |
4772 | ||
4773 | v = find_variable (name); | |
4774 | if (v == 0 || var_isnull (v)) | |
4775 | rl_reset_screen_size (); | |
4776 | else | |
4777 | { | |
4778 | if (legal_number (value_cell (v), &xd) == 0) | |
4779 | return; | |
4780 | winsize_assignment = 1; | |
4781 | d = xd; /* truncate */ | |
4782 | if (name[0] == 'L') /* LINES */ | |
4783 | rl_set_screen_size (d, -1); | |
4784 | else /* COLUMNS */ | |
4785 | rl_set_screen_size (-1, d); | |
4786 | winsize_assignment = 0; | |
4787 | } | |
4788 | } | |
4789 | #endif /* STRICT_POSIX */ | |
4790 | #endif /* READLINE */ | |
4791 | ||
4792 | /* Update the value of HOME in the export environment so tilde expansion will | |
4793 | work on cygwin. */ | |
4794 | #if defined (__CYGWIN__) | |
4795 | sv_home (name) | |
4796 | char *name; | |
4797 | { | |
4798 | array_needs_making = 1; | |
4799 | maybe_make_export_env (); | |
4800 | } | |
4801 | #endif | |
4802 | ||
4803 | #if defined (HISTORY) | |
4804 | /* What to do after the HISTSIZE or HISTFILESIZE variables change. | |
4805 | If there is a value for this HISTSIZE (and it is numeric), then stifle | |
4806 | the history. Otherwise, if there is NO value for this variable, | |
4807 | unstifle the history. If name is HISTFILESIZE, and its value is | |
4808 | numeric, truncate the history file to hold no more than that many | |
4809 | lines. */ | |
4810 | void | |
4811 | sv_histsize (name) | |
4812 | char *name; | |
4813 | { | |
4814 | char *temp; | |
4815 | intmax_t num; | |
4816 | int hmax; | |
4817 | ||
4818 | temp = get_string_value (name); | |
4819 | ||
4820 | if (temp && *temp) | |
4821 | { | |
4822 | if (legal_number (temp, &num)) | |
4823 | { | |
4824 | hmax = num; | |
4825 | if (hmax < 0 && name[4] == 'S') | |
4826 | unstifle_history (); /* unstifle history if HISTSIZE < 0 */ | |
4827 | else if (name[4] == 'S') | |
4828 | { | |
4829 | stifle_history (hmax); | |
4830 | hmax = where_history (); | |
4831 | if (history_lines_this_session > hmax) | |
4832 | history_lines_this_session = hmax; | |
4833 | } | |
4834 | else if (hmax >= 0) /* truncate HISTFILE if HISTFILESIZE >= 0 */ | |
4835 | { | |
4836 | history_truncate_file (get_string_value ("HISTFILE"), hmax); | |
4837 | if (hmax <= history_lines_in_file) | |
4838 | history_lines_in_file = hmax; | |
4839 | } | |
4840 | } | |
4841 | } | |
4842 | else if (name[4] == 'S') | |
4843 | unstifle_history (); | |
4844 | } | |
4845 | ||
4846 | /* What to do after the HISTIGNORE variable changes. */ | |
4847 | void | |
4848 | sv_histignore (name) | |
4849 | char *name; | |
4850 | { | |
4851 | setup_history_ignore (name); | |
4852 | } | |
4853 | ||
4854 | /* What to do after the HISTCONTROL variable changes. */ | |
4855 | void | |
4856 | sv_history_control (name) | |
4857 | char *name; | |
4858 | { | |
4859 | char *temp; | |
4860 | char *val; | |
4861 | int tptr; | |
4862 | ||
4863 | history_control = 0; | |
4864 | temp = get_string_value (name); | |
4865 | ||
4866 | if (temp == 0 || *temp == 0) | |
4867 | return; | |
4868 | ||
4869 | tptr = 0; | |
4870 | while (val = extract_colon_unit (temp, &tptr)) | |
4871 | { | |
4872 | if (STREQ (val, "ignorespace")) | |
4873 | history_control |= HC_IGNSPACE; | |
4874 | else if (STREQ (val, "ignoredups")) | |
4875 | history_control |= HC_IGNDUPS; | |
4876 | else if (STREQ (val, "ignoreboth")) | |
4877 | history_control |= HC_IGNBOTH; | |
4878 | else if (STREQ (val, "erasedups")) | |
4879 | history_control |= HC_ERASEDUPS; | |
4880 | ||
4881 | free (val); | |
4882 | } | |
4883 | } | |
4884 | ||
4885 | #if defined (BANG_HISTORY) | |
4886 | /* Setting/unsetting of the history expansion character. */ | |
4887 | void | |
4888 | sv_histchars (name) | |
4889 | char *name; | |
4890 | { | |
4891 | char *temp; | |
4892 | ||
4893 | temp = get_string_value (name); | |
4894 | if (temp) | |
4895 | { | |
4896 | history_expansion_char = *temp; | |
4897 | if (temp[0] && temp[1]) | |
4898 | { | |
4899 | history_subst_char = temp[1]; | |
4900 | if (temp[2]) | |
4901 | history_comment_char = temp[2]; | |
4902 | } | |
4903 | } | |
4904 | else | |
4905 | { | |
4906 | history_expansion_char = '!'; | |
4907 | history_subst_char = '^'; | |
4908 | history_comment_char = '#'; | |
4909 | } | |
4910 | } | |
4911 | #endif /* BANG_HISTORY */ | |
4912 | ||
4913 | void | |
4914 | sv_histtimefmt (name) | |
4915 | char *name; | |
4916 | { | |
4917 | SHELL_VAR *v; | |
4918 | ||
4919 | if (v = find_variable (name)) | |
4920 | { | |
4921 | if (history_comment_char == 0) | |
4922 | history_comment_char = '#'; | |
4923 | } | |
4924 | history_write_timestamps = (v != 0); | |
4925 | } | |
4926 | #endif /* HISTORY */ | |
4927 | ||
4928 | #if defined (HAVE_TZSET) | |
4929 | void | |
4930 | sv_tz (name) | |
4931 | char *name; | |
4932 | { | |
4933 | if (chkexport (name)) | |
4934 | tzset (); | |
4935 | } | |
4936 | #endif | |
4937 | ||
4938 | /* If the variable exists, then the value of it can be the number | |
4939 | of times we actually ignore the EOF. The default is small, | |
4940 | (smaller than csh, anyway). */ | |
4941 | void | |
4942 | sv_ignoreeof (name) | |
4943 | char *name; | |
4944 | { | |
4945 | SHELL_VAR *tmp_var; | |
4946 | char *temp; | |
4947 | ||
4948 | eof_encountered = 0; | |
4949 | ||
4950 | tmp_var = find_variable (name); | |
4951 | ignoreeof = tmp_var != 0; | |
4952 | temp = tmp_var ? value_cell (tmp_var) : (char *)NULL; | |
4953 | if (temp) | |
4954 | eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10; | |
4955 | set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */ | |
4956 | } | |
4957 | ||
4958 | void | |
4959 | sv_optind (name) | |
4960 | char *name; | |
4961 | { | |
4962 | char *tt; | |
4963 | int s; | |
4964 | ||
4965 | tt = get_string_value ("OPTIND"); | |
4966 | if (tt && *tt) | |
4967 | { | |
4968 | s = atoi (tt); | |
4969 | ||
4970 | /* According to POSIX, setting OPTIND=1 resets the internal state | |
4971 | of getopt (). */ | |
4972 | if (s < 0 || s == 1) | |
4973 | s = 0; | |
4974 | } | |
4975 | else | |
4976 | s = 0; | |
4977 | getopts_reset (s); | |
4978 | } | |
4979 | ||
4980 | void | |
4981 | sv_opterr (name) | |
4982 | char *name; | |
4983 | { | |
4984 | char *tt; | |
4985 | ||
4986 | tt = get_string_value ("OPTERR"); | |
4987 | sh_opterr = (tt && *tt) ? atoi (tt) : 1; | |
4988 | } | |
4989 | ||
4990 | void | |
4991 | sv_strict_posix (name) | |
4992 | char *name; | |
4993 | { | |
4994 | SET_INT_VAR (name, posixly_correct); | |
4995 | posix_initialize (posixly_correct); | |
4996 | #if defined (READLINE) | |
4997 | if (interactive_shell) | |
4998 | posix_readline_initialize (posixly_correct); | |
4999 | #endif /* READLINE */ | |
5000 | set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */ | |
5001 | } | |
5002 | ||
5003 | void | |
5004 | sv_locale (name) | |
5005 | char *name; | |
5006 | { | |
5007 | char *v; | |
5008 | int r; | |
5009 | ||
5010 | v = get_string_value (name); | |
5011 | if (name[0] == 'L' && name[1] == 'A') /* LANG */ | |
5012 | r = set_lang (name, v); | |
5013 | else | |
5014 | r = set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */ | |
5015 | ||
5016 | #if 1 | |
5017 | if (r == 0 && posixly_correct) | |
5018 | last_command_exit_value = 1; | |
5019 | #endif | |
5020 | } | |
5021 | ||
5022 | #if defined (ARRAY_VARS) | |
5023 | void | |
5024 | set_pipestatus_array (ps, nproc) | |
5025 | int *ps; | |
5026 | int nproc; | |
5027 | { | |
5028 | SHELL_VAR *v; | |
5029 | ARRAY *a; | |
5030 | ARRAY_ELEMENT *ae; | |
5031 | register int i; | |
5032 | char *t, tbuf[INT_STRLEN_BOUND(int) + 1]; | |
5033 | ||
5034 | v = find_variable ("PIPESTATUS"); | |
5035 | if (v == 0) | |
5036 | v = make_new_array_variable ("PIPESTATUS"); | |
5037 | if (array_p (v) == 0) | |
5038 | return; /* Do nothing if not an array variable. */ | |
5039 | a = array_cell (v); | |
5040 | ||
5041 | if (a == 0 || array_num_elements (a) == 0) | |
5042 | { | |
5043 | for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */ | |
5044 | { | |
5045 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
5046 | array_insert (a, i, t); | |
5047 | } | |
5048 | return; | |
5049 | } | |
5050 | ||
5051 | /* Fast case */ | |
5052 | if (array_num_elements (a) == nproc && nproc == 1) | |
5053 | { | |
5054 | ae = element_forw (a->head); | |
5055 | free (element_value (ae)); | |
5056 | ae->value = itos (ps[0]); | |
5057 | } | |
5058 | else if (array_num_elements (a) <= nproc) | |
5059 | { | |
5060 | /* modify in array_num_elements members in place, then add */ | |
5061 | ae = a->head; | |
5062 | for (i = 0; i < array_num_elements (a); i++) | |
5063 | { | |
5064 | ae = element_forw (ae); | |
5065 | free (element_value (ae)); | |
5066 | ae->value = itos (ps[i]); | |
5067 | } | |
5068 | /* add any more */ | |
5069 | for ( ; i < nproc; i++) | |
5070 | { | |
5071 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
5072 | array_insert (a, i, t); | |
5073 | } | |
5074 | } | |
5075 | else | |
5076 | { | |
5077 | /* deleting elements. it's faster to rebuild the array. */ | |
5078 | array_flush (a); | |
5079 | for (i = 0; ps[i] != -1; i++) | |
5080 | { | |
5081 | t = inttostr (ps[i], tbuf, sizeof (tbuf)); | |
5082 | array_insert (a, i, t); | |
5083 | } | |
5084 | } | |
5085 | } | |
5086 | ||
5087 | ARRAY * | |
5088 | save_pipestatus_array () | |
5089 | { | |
5090 | SHELL_VAR *v; | |
5091 | ARRAY *a, *a2; | |
5092 | ||
5093 | v = find_variable ("PIPESTATUS"); | |
5094 | if (v == 0 || array_p (v) == 0 || array_cell (v) == 0) | |
5095 | return ((ARRAY *)NULL); | |
5096 | ||
5097 | a = array_cell (v); | |
5098 | a2 = array_copy (array_cell (v)); | |
5099 | ||
5100 | return a2; | |
5101 | } | |
5102 | ||
5103 | void | |
5104 | restore_pipestatus_array (a) | |
5105 | ARRAY *a; | |
5106 | { | |
5107 | SHELL_VAR *v; | |
5108 | ARRAY *a2; | |
5109 | ||
5110 | v = find_variable ("PIPESTATUS"); | |
5111 | /* XXX - should we still assign even if existing value is NULL? */ | |
5112 | if (v == 0 || array_p (v) == 0 || array_cell (v) == 0) | |
5113 | return; | |
5114 | ||
5115 | a2 = array_cell (v); | |
5116 | var_setarray (v, a); | |
5117 | ||
5118 | array_dispose (a2); | |
5119 | } | |
5120 | #endif | |
5121 | ||
5122 | void | |
5123 | set_pipestatus_from_exit (s) | |
5124 | int s; | |
5125 | { | |
5126 | #if defined (ARRAY_VARS) | |
5127 | static int v[2] = { 0, -1 }; | |
5128 | ||
5129 | v[0] = s; | |
5130 | set_pipestatus_array (v, 1); | |
5131 | #endif | |
5132 | } | |
5133 | ||
5134 | void | |
5135 | sv_xtracefd (name) | |
5136 | char *name; | |
5137 | { | |
5138 | SHELL_VAR *v; | |
5139 | char *t, *e; | |
5140 | int fd; | |
5141 | FILE *fp; | |
5142 | ||
5143 | v = find_variable (name); | |
5144 | if (v == 0) | |
5145 | { | |
5146 | xtrace_reset (); | |
5147 | return; | |
5148 | } | |
5149 | ||
5150 | t = value_cell (v); | |
5151 | if (t == 0 || *t == 0) | |
5152 | xtrace_reset (); | |
5153 | else | |
5154 | { | |
5155 | fd = (int)strtol (t, &e, 10); | |
5156 | if (e != t && *e == '\0' && sh_validfd (fd)) | |
5157 | { | |
5158 | fp = fdopen (fd, "w"); | |
5159 | if (fp == 0) | |
5160 | internal_error (_("%s: %s: cannot open as FILE"), name, value_cell (v)); | |
5161 | else | |
5162 | xtrace_set (fd, fp); | |
5163 | } | |
5164 | else | |
5165 | internal_error (_("%s: %s: invalid value for trace file descriptor"), name, value_cell (v)); | |
5166 | } | |
5167 | } | |
5168 | ||
5169 | #define MIN_COMPAT_LEVEL 31 | |
5170 | ||
5171 | void | |
5172 | sv_shcompat (name) | |
5173 | char *name; | |
5174 | { | |
5175 | SHELL_VAR *v; | |
5176 | char *val; | |
5177 | int tens, ones, compatval; | |
5178 | ||
5179 | v = find_variable (name); | |
5180 | if (v == 0) | |
5181 | { | |
5182 | shell_compatibility_level = DEFAULT_COMPAT_LEVEL; | |
5183 | set_compatibility_opts (); | |
5184 | return; | |
5185 | } | |
5186 | val = value_cell (v); | |
5187 | if (val == 0 || *val == '\0') | |
5188 | { | |
5189 | shell_compatibility_level = DEFAULT_COMPAT_LEVEL; | |
5190 | set_compatibility_opts (); | |
5191 | return; | |
5192 | } | |
5193 | /* Handle decimal-like compatibility version specifications: 4.2 */ | |
5194 | if (isdigit (val[0]) && val[1] == '.' && isdigit (val[2]) && val[3] == 0) | |
5195 | { | |
5196 | tens = val[0] - '0'; | |
5197 | ones = val[2] - '0'; | |
5198 | compatval = tens*10 + ones; | |
5199 | } | |
5200 | /* Handle integer-like compatibility version specifications: 42 */ | |
5201 | else if (isdigit (val[0]) && isdigit (val[1]) && val[2] == 0) | |
5202 | { | |
5203 | tens = val[0] - '0'; | |
5204 | ones = val[1] - '0'; | |
5205 | compatval = tens*10 + ones; | |
5206 | } | |
5207 | else | |
5208 | { | |
5209 | compat_error: | |
5210 | internal_error (_("%s: %s: compatibility value out of range"), name, val); | |
5211 | shell_compatibility_level = DEFAULT_COMPAT_LEVEL; | |
5212 | set_compatibility_opts (); | |
5213 | return; | |
5214 | } | |
5215 | ||
5216 | if (compatval < MIN_COMPAT_LEVEL || compatval > DEFAULT_COMPAT_LEVEL) | |
5217 | goto compat_error; | |
5218 | ||
5219 | shell_compatibility_level = compatval; | |
5220 | set_compatibility_opts (); | |
5221 | } | |
5222 | ||
5223 | #if defined (JOB_CONTROL) | |
5224 | void | |
5225 | sv_childmax (name) | |
5226 | char *name; | |
5227 | { | |
5228 | char *tt; | |
5229 | int s; | |
5230 | ||
5231 | tt = get_string_value (name); | |
5232 | s = (tt && *tt) ? atoi (tt) : 0; | |
5233 | set_maxchild (s); | |
5234 | } | |
5235 | #endif |