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6#include <ctype.h>
7#include <stdlib.h>
8#include <string.h>
9#include <regex.h>
10#include <sys/utsname.h>
11
12#define LKC_DIRECT_LINK
13#include "lkc.h"
14
15struct symbol symbol_yes = {
16 .name = "y",
17 .curr = { "y", yes },
18 .flags = SYMBOL_CONST|SYMBOL_VALID,
19}, symbol_mod = {
20 .name = "m",
21 .curr = { "m", mod },
22 .flags = SYMBOL_CONST|SYMBOL_VALID,
23}, symbol_no = {
24 .name = "n",
25 .curr = { "n", no },
26 .flags = SYMBOL_CONST|SYMBOL_VALID,
27}, symbol_empty = {
28 .name = "",
29 .curr = { "", no },
30 .flags = SYMBOL_VALID,
31};
32
33struct symbol *sym_defconfig_list;
34struct symbol *modules_sym;
35tristate modules_val;
36
37struct expr *sym_env_list;
38
39void sym_add_default(struct symbol *sym, const char *def)
40{
41 struct property *prop = prop_alloc(P_DEFAULT, sym);
42
43 prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
44}
45
46void sym_init(void)
47{
48 struct symbol *sym;
49 struct utsname uts;
50 static bool inited = false;
51
52 if (inited)
53 return;
54 inited = true;
55
56 uname(&uts);
57
58 sym = sym_lookup("UNAME_RELEASE", 0);
59 sym->type = S_STRING;
60 sym->flags |= SYMBOL_AUTO;
61 sym_add_default(sym, uts.release);
62}
63
64enum symbol_type sym_get_type(struct symbol *sym)
65{
66 enum symbol_type type = sym->type;
67
68 if (type == S_TRISTATE) {
69 if (sym_is_choice_value(sym) && sym->visible == yes)
70 type = S_BOOLEAN;
71 else if (modules_val == no)
72 type = S_BOOLEAN;
73 }
74 return type;
75}
76
77const char *sym_type_name(enum symbol_type type)
78{
79 switch (type) {
80 case S_BOOLEAN:
81 return "boolean";
82 case S_TRISTATE:
83 return "tristate";
84 case S_INT:
85 return "integer";
86 case S_HEX:
87 return "hex";
88 case S_STRING:
89 return "string";
90 case S_UNKNOWN:
91 return "unknown";
92 case S_OTHER:
93 break;
94 }
95 return "???";
96}
97
98struct property *sym_get_choice_prop(struct symbol *sym)
99{
100 struct property *prop;
101
102 for_all_choices(sym, prop)
103 return prop;
104 return NULL;
105}
106
107struct property *sym_get_env_prop(struct symbol *sym)
108{
109 struct property *prop;
110
111 for_all_properties(sym, prop, P_ENV)
112 return prop;
113 return NULL;
114}
115
116struct property *sym_get_default_prop(struct symbol *sym)
117{
118 struct property *prop;
119
120 for_all_defaults(sym, prop) {
121 prop->visible.tri = expr_calc_value(prop->visible.expr);
122 if (prop->visible.tri != no)
123 return prop;
124 }
125 return NULL;
126}
127
128struct property *sym_get_range_prop(struct symbol *sym)
129{
130 struct property *prop;
131
132 for_all_properties(sym, prop, P_RANGE) {
133 prop->visible.tri = expr_calc_value(prop->visible.expr);
134 if (prop->visible.tri != no)
135 return prop;
136 }
137 return NULL;
138}
139
140static int sym_get_range_val(struct symbol *sym, int base)
141{
142 sym_calc_value(sym);
143 switch (sym->type) {
144 case S_INT:
145 base = 10;
146 break;
147 case S_HEX:
148 base = 16;
149 break;
150 default:
151 break;
152 }
153 return strtol(sym->curr.val, NULL, base);
154}
155
156static void sym_validate_range(struct symbol *sym)
157{
158 struct property *prop;
159 int base, val, val2;
160 char str[64];
161
162 switch (sym->type) {
163 case S_INT:
164 base = 10;
165 break;
166 case S_HEX:
167 base = 16;
168 break;
169 default:
170 return;
171 }
172 prop = sym_get_range_prop(sym);
173 if (!prop)
174 return;
175 val = strtol(sym->curr.val, NULL, base);
176 val2 = sym_get_range_val(prop->expr->left.sym, base);
177 if (val >= val2) {
178 val2 = sym_get_range_val(prop->expr->right.sym, base);
179 if (val <= val2)
180 return;
181 }
182 if (sym->type == S_INT)
183 sprintf(str, "%d", val2);
184 else
185 sprintf(str, "0x%x", val2);
186 sym->curr.val = strdup(str);
187}
188
189static void sym_calc_visibility(struct symbol *sym)
190{
191 struct property *prop;
192 tristate tri;
193
194
195 tri = no;
196 for_all_prompts(sym, prop) {
197 prop->visible.tri = expr_calc_value(prop->visible.expr);
198 tri = EXPR_OR(tri, prop->visible.tri);
199 }
200 if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
201 tri = yes;
202 if (sym->visible != tri) {
203 sym->visible = tri;
204 sym_set_changed(sym);
205 }
206 if (sym_is_choice_value(sym))
207 return;
208 tri = no;
209 if (sym->rev_dep.expr)
210 tri = expr_calc_value(sym->rev_dep.expr);
211 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
212 tri = yes;
213 if (sym->rev_dep.tri != tri) {
214 sym->rev_dep.tri = tri;
215 sym_set_changed(sym);
216 }
217}
218
219static struct symbol *sym_calc_choice(struct symbol *sym)
220{
221 struct symbol *def_sym;
222 struct property *prop;
223 struct expr *e;
224
225
226 def_sym = sym->def[S_DEF_USER].val;
227 if (def_sym) {
228 sym_calc_visibility(def_sym);
229 if (def_sym->visible != no)
230 return def_sym;
231 }
232
233
234 for_all_defaults(sym, prop) {
235 prop->visible.tri = expr_calc_value(prop->visible.expr);
236 if (prop->visible.tri == no)
237 continue;
238 def_sym = prop_get_symbol(prop);
239 sym_calc_visibility(def_sym);
240 if (def_sym->visible != no)
241 return def_sym;
242 }
243
244
245 prop = sym_get_choice_prop(sym);
246 expr_list_for_each_sym(prop->expr, e, def_sym) {
247 sym_calc_visibility(def_sym);
248 if (def_sym->visible != no)
249 return def_sym;
250 }
251
252
253 sym->curr.tri = no;
254 return NULL;
255}
256
257void sym_calc_value(struct symbol *sym)
258{
259 struct symbol_value newval, oldval;
260 struct property *prop;
261 struct expr *e;
262
263 if (!sym)
264 return;
265
266 if (sym->flags & SYMBOL_VALID)
267 return;
268 sym->flags |= SYMBOL_VALID;
269
270 oldval = sym->curr;
271
272 switch (sym->type) {
273 case S_INT:
274 case S_HEX:
275 case S_STRING:
276 newval = symbol_empty.curr;
277 break;
278 case S_BOOLEAN:
279 case S_TRISTATE:
280 newval = symbol_no.curr;
281 break;
282 default:
283 sym->curr.val = sym->name;
284 sym->curr.tri = no;
285 return;
286 }
287 if (!sym_is_choice_value(sym))
288 sym->flags &= ~SYMBOL_WRITE;
289
290 sym_calc_visibility(sym);
291
292
293 sym->curr = newval;
294
295 switch (sym_get_type(sym)) {
296 case S_BOOLEAN:
297 case S_TRISTATE:
298 if (sym_is_choice_value(sym) && sym->visible == yes) {
299 prop = sym_get_choice_prop(sym);
300 newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
301 } else {
302 if (sym->visible != no) {
303
304
305
306 sym->flags |= SYMBOL_WRITE;
307 if (sym_has_value(sym)) {
308 newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
309 sym->visible);
310 goto calc_newval;
311 }
312 }
313 if (sym->rev_dep.tri != no)
314 sym->flags |= SYMBOL_WRITE;
315 if (!sym_is_choice(sym)) {
316 prop = sym_get_default_prop(sym);
317 if (prop) {
318 sym->flags |= SYMBOL_WRITE;
319 newval.tri = EXPR_AND(expr_calc_value(prop->expr),
320 prop->visible.tri);
321 }
322 }
323 calc_newval:
324 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
325 }
326 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
327 newval.tri = yes;
328 break;
329 case S_STRING:
330 case S_HEX:
331 case S_INT:
332 if (sym->visible != no) {
333 sym->flags |= SYMBOL_WRITE;
334 if (sym_has_value(sym)) {
335 newval.val = sym->def[S_DEF_USER].val;
336 break;
337 }
338 }
339 prop = sym_get_default_prop(sym);
340 if (prop) {
341 struct symbol *ds = prop_get_symbol(prop);
342 if (ds) {
343 sym->flags |= SYMBOL_WRITE;
344 sym_calc_value(ds);
345 newval.val = ds->curr.val;
346 }
347 }
348 break;
349 default:
350 ;
351 }
352
353 if (sym->flags & SYMBOL_AUTO)
354 sym->flags &= ~SYMBOL_WRITE;
355
356 sym->curr = newval;
357 if (sym_is_choice(sym) && newval.tri == yes)
358 sym->curr.val = sym_calc_choice(sym);
359 sym_validate_range(sym);
360
361 if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
362 sym_set_changed(sym);
363 if (modules_sym == sym) {
364 sym_set_all_changed();
365 modules_val = modules_sym->curr.tri;
366 }
367 }
368
369 if (sym_is_choice(sym)) {
370 struct symbol *choice_sym;
371 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
372
373 prop = sym_get_choice_prop(sym);
374 expr_list_for_each_sym(prop->expr, e, choice_sym) {
375 choice_sym->flags |= flags;
376 if (flags & SYMBOL_CHANGED)
377 sym_set_changed(choice_sym);
378 }
379 }
380}
381
382void sym_clear_all_valid(void)
383{
384 struct symbol *sym;
385 int i;
386
387 for_all_symbols(i, sym)
388 sym->flags &= ~SYMBOL_VALID;
389 sym_add_change_count(1);
390 if (modules_sym)
391 sym_calc_value(modules_sym);
392}
393
394void sym_set_changed(struct symbol *sym)
395{
396 struct property *prop;
397
398 sym->flags |= SYMBOL_CHANGED;
399 for (prop = sym->prop; prop; prop = prop->next) {
400 if (prop->menu)
401 prop->menu->flags |= MENU_CHANGED;
402 }
403}
404
405void sym_set_all_changed(void)
406{
407 struct symbol *sym;
408 int i;
409
410 for_all_symbols(i, sym)
411 sym_set_changed(sym);
412}
413
414bool sym_tristate_within_range(struct symbol *sym, tristate val)
415{
416 int type = sym_get_type(sym);
417
418 if (sym->visible == no)
419 return false;
420
421 if (type != S_BOOLEAN && type != S_TRISTATE)
422 return false;
423
424 if (type == S_BOOLEAN && val == mod)
425 return false;
426 if (sym->visible <= sym->rev_dep.tri)
427 return false;
428 if (sym_is_choice_value(sym) && sym->visible == yes)
429 return val == yes;
430 return val >= sym->rev_dep.tri && val <= sym->visible;
431}
432
433bool sym_set_tristate_value(struct symbol *sym, tristate val)
434{
435 tristate oldval = sym_get_tristate_value(sym);
436
437 if (oldval != val && !sym_tristate_within_range(sym, val))
438 return false;
439
440 if (!(sym->flags & SYMBOL_DEF_USER)) {
441 sym->flags |= SYMBOL_DEF_USER;
442 sym_set_changed(sym);
443 }
444
445
446
447
448 if (sym_is_choice_value(sym) && val == yes) {
449 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
450 struct property *prop;
451 struct expr *e;
452
453 cs->def[S_DEF_USER].val = sym;
454 cs->flags |= SYMBOL_DEF_USER;
455 prop = sym_get_choice_prop(cs);
456 for (e = prop->expr; e; e = e->left.expr) {
457 if (e->right.sym->visible != no)
458 e->right.sym->flags |= SYMBOL_DEF_USER;
459 }
460 }
461
462 sym->def[S_DEF_USER].tri = val;
463 if (oldval != val)
464 sym_clear_all_valid();
465
466 return true;
467}
468
469tristate sym_toggle_tristate_value(struct symbol *sym)
470{
471 tristate oldval, newval;
472
473 oldval = newval = sym_get_tristate_value(sym);
474 do {
475 switch (newval) {
476 case no:
477 newval = mod;
478 break;
479 case mod:
480 newval = yes;
481 break;
482 case yes:
483 newval = no;
484 break;
485 }
486 if (sym_set_tristate_value(sym, newval))
487 break;
488 } while (oldval != newval);
489 return newval;
490}
491
492bool sym_string_valid(struct symbol *sym, const char *str)
493{
494 signed char ch;
495
496 switch (sym->type) {
497 case S_STRING:
498 return true;
499 case S_INT:
500 ch = *str++;
501 if (ch == '-')
502 ch = *str++;
503 if (!isdigit(ch))
504 return false;
505 if (ch == '0' && *str != 0)
506 return false;
507 while ((ch = *str++)) {
508 if (!isdigit(ch))
509 return false;
510 }
511 return true;
512 case S_HEX:
513 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
514 str += 2;
515 ch = *str++;
516 do {
517 if (!isxdigit(ch))
518 return false;
519 } while ((ch = *str++));
520 return true;
521 case S_BOOLEAN:
522 case S_TRISTATE:
523 switch (str[0]) {
524 case 'y': case 'Y':
525 case 'm': case 'M':
526 case 'n': case 'N':
527 return true;
528 }
529 return false;
530 default:
531 return false;
532 }
533}
534
535bool sym_string_within_range(struct symbol *sym, const char *str)
536{
537 struct property *prop;
538 int val;
539
540 switch (sym->type) {
541 case S_STRING:
542 return sym_string_valid(sym, str);
543 case S_INT:
544 if (!sym_string_valid(sym, str))
545 return false;
546 prop = sym_get_range_prop(sym);
547 if (!prop)
548 return true;
549 val = strtol(str, NULL, 10);
550 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
551 val <= sym_get_range_val(prop->expr->right.sym, 10);
552 case S_HEX:
553 if (!sym_string_valid(sym, str))
554 return false;
555 prop = sym_get_range_prop(sym);
556 if (!prop)
557 return true;
558 val = strtol(str, NULL, 16);
559 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
560 val <= sym_get_range_val(prop->expr->right.sym, 16);
561 case S_BOOLEAN:
562 case S_TRISTATE:
563 switch (str[0]) {
564 case 'y': case 'Y':
565 return sym_tristate_within_range(sym, yes);
566 case 'm': case 'M':
567 return sym_tristate_within_range(sym, mod);
568 case 'n': case 'N':
569 return sym_tristate_within_range(sym, no);
570 }
571 return false;
572 default:
573 return false;
574 }
575}
576
577bool sym_set_string_value(struct symbol *sym, const char *newval)
578{
579 const char *oldval;
580 char *val;
581 int size;
582
583 switch (sym->type) {
584 case S_BOOLEAN:
585 case S_TRISTATE:
586 switch (newval[0]) {
587 case 'y': case 'Y':
588 return sym_set_tristate_value(sym, yes);
589 case 'm': case 'M':
590 return sym_set_tristate_value(sym, mod);
591 case 'n': case 'N':
592 return sym_set_tristate_value(sym, no);
593 }
594 return false;
595 default:
596 ;
597 }
598
599 if (!sym_string_within_range(sym, newval))
600 return false;
601
602 if (!(sym->flags & SYMBOL_DEF_USER)) {
603 sym->flags |= SYMBOL_DEF_USER;
604 sym_set_changed(sym);
605 }
606
607 oldval = sym->def[S_DEF_USER].val;
608 size = strlen(newval) + 1;
609 if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
610 size += 2;
611 sym->def[S_DEF_USER].val = val = malloc(size);
612 *val++ = '0';
613 *val++ = 'x';
614 } else if (!oldval || strcmp(oldval, newval))
615 sym->def[S_DEF_USER].val = val = malloc(size);
616 else
617 return true;
618
619 strcpy(val, newval);
620 free((void *)oldval);
621 sym_clear_all_valid();
622
623 return true;
624}
625
626const char *sym_get_string_value(struct symbol *sym)
627{
628 tristate val;
629
630 switch (sym->type) {
631 case S_BOOLEAN:
632 case S_TRISTATE:
633 val = sym_get_tristate_value(sym);
634 switch (val) {
635 case no:
636 return "n";
637 case mod:
638 return "m";
639 case yes:
640 return "y";
641 }
642 break;
643 default:
644 ;
645 }
646 return (const char *)sym->curr.val;
647}
648
649bool sym_is_changable(struct symbol *sym)
650{
651 return sym->visible > sym->rev_dep.tri;
652}
653
654struct symbol *sym_lookup(const char *name, int isconst)
655{
656 struct symbol *symbol;
657 const char *ptr;
658 char *new_name;
659 int hash = 0;
660
661 if (name) {
662 if (name[0] && !name[1]) {
663 switch (name[0]) {
664 case 'y': return &symbol_yes;
665 case 'm': return &symbol_mod;
666 case 'n': return &symbol_no;
667 }
668 }
669 for (ptr = name; *ptr; ptr++)
670 hash += *ptr;
671 hash &= 0xff;
672
673 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
674 if (!strcmp(symbol->name, name)) {
675 if ((isconst && symbol->flags & SYMBOL_CONST) ||
676 (!isconst && !(symbol->flags & SYMBOL_CONST)))
677 return symbol;
678 }
679 }
680 new_name = strdup(name);
681 } else {
682 new_name = NULL;
683 hash = 256;
684 }
685
686 symbol = malloc(sizeof(*symbol));
687 memset(symbol, 0, sizeof(*symbol));
688 symbol->name = new_name;
689 symbol->type = S_UNKNOWN;
690 if (isconst)
691 symbol->flags |= SYMBOL_CONST;
692
693 symbol->next = symbol_hash[hash];
694 symbol_hash[hash] = symbol;
695
696 return symbol;
697}
698
699struct symbol *sym_find(const char *name)
700{
701 struct symbol *symbol = NULL;
702 const char *ptr;
703 int hash = 0;
704
705 if (!name)
706 return NULL;
707
708 if (name[0] && !name[1]) {
709 switch (name[0]) {
710 case 'y': return &symbol_yes;
711 case 'm': return &symbol_mod;
712 case 'n': return &symbol_no;
713 }
714 }
715 for (ptr = name; *ptr; ptr++)
716 hash += *ptr;
717 hash &= 0xff;
718
719 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
720 if (!strcmp(symbol->name, name) &&
721 !(symbol->flags & SYMBOL_CONST))
722 break;
723 }
724
725 return symbol;
726}
727
728struct symbol **sym_re_search(const char *pattern)
729{
730 struct symbol *sym, **sym_arr = NULL;
731 int i, cnt, size;
732 regex_t re;
733
734 cnt = size = 0;
735
736 if (strlen(pattern) == 0)
737 return NULL;
738 if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
739 return NULL;
740
741 for_all_symbols(i, sym) {
742 if (sym->flags & SYMBOL_CONST || !sym->name)
743 continue;
744 if (regexec(&re, sym->name, 0, NULL, 0))
745 continue;
746 if (cnt + 1 >= size) {
747 void *tmp = sym_arr;
748 size += 16;
749 sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
750 if (!sym_arr) {
751 free(tmp);
752 return NULL;
753 }
754 }
755 sym_arr[cnt++] = sym;
756 }
757 if (sym_arr)
758 sym_arr[cnt] = NULL;
759 regfree(&re);
760
761 return sym_arr;
762}
763
764
765struct symbol *sym_check_deps(struct symbol *sym);
766
767static struct symbol *sym_check_expr_deps(struct expr *e)
768{
769 struct symbol *sym;
770
771 if (!e)
772 return NULL;
773 switch (e->type) {
774 case E_OR:
775 case E_AND:
776 sym = sym_check_expr_deps(e->left.expr);
777 if (sym)
778 return sym;
779 return sym_check_expr_deps(e->right.expr);
780 case E_NOT:
781 return sym_check_expr_deps(e->left.expr);
782 case E_EQUAL:
783 case E_UNEQUAL:
784 sym = sym_check_deps(e->left.sym);
785 if (sym)
786 return sym;
787 return sym_check_deps(e->right.sym);
788 case E_SYMBOL:
789 return sym_check_deps(e->left.sym);
790 default:
791 break;
792 }
793 printf("Oops! How to check %d?\n", e->type);
794 return NULL;
795}
796
797
798struct symbol *sym_check_deps(struct symbol *sym)
799{
800 struct symbol *sym2;
801 struct property *prop;
802
803 if (sym->flags & SYMBOL_CHECK) {
804 fprintf(stderr, "%s:%d:error: found recursive dependency: %s",
805 sym->prop->file->name, sym->prop->lineno, sym->name);
806 return sym;
807 }
808 if (sym->flags & SYMBOL_CHECKED)
809 return NULL;
810
811 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
812 sym2 = sym_check_expr_deps(sym->rev_dep.expr);
813 if (sym2)
814 goto out;
815
816 for (prop = sym->prop; prop; prop = prop->next) {
817 if (prop->type == P_CHOICE || prop->type == P_SELECT)
818 continue;
819 sym2 = sym_check_expr_deps(prop->visible.expr);
820 if (sym2)
821 goto out;
822 if (prop->type != P_DEFAULT || sym_is_choice(sym))
823 continue;
824 sym2 = sym_check_expr_deps(prop->expr);
825 if (sym2)
826 goto out;
827 }
828out:
829 if (sym2)
830 fprintf(stderr, " -> %s%s", sym->name, sym2 == sym? "\n": "");
831 sym->flags &= ~SYMBOL_CHECK;
832 return sym2;
833}
834
835struct property *prop_alloc(enum prop_type type, struct symbol *sym)
836{
837 struct property *prop;
838 struct property **propp;
839
840 prop = malloc(sizeof(*prop));
841 memset(prop, 0, sizeof(*prop));
842 prop->type = type;
843 prop->sym = sym;
844 prop->file = current_file;
845 prop->lineno = zconf_lineno();
846
847
848 if (sym) {
849 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
850 ;
851 *propp = prop;
852 }
853
854 return prop;
855}
856
857struct symbol *prop_get_symbol(struct property *prop)
858{
859 if (prop->expr && (prop->expr->type == E_SYMBOL ||
860 prop->expr->type == E_LIST))
861 return prop->expr->left.sym;
862 return NULL;
863}
864
865const char *prop_get_type_name(enum prop_type type)
866{
867 switch (type) {
868 case P_PROMPT:
869 return "prompt";
870 case P_ENV:
871 return "env";
872 case P_COMMENT:
873 return "comment";
874 case P_MENU:
875 return "menu";
876 case P_DEFAULT:
877 return "default";
878 case P_CHOICE:
879 return "choice";
880 case P_SELECT:
881 return "select";
882 case P_RANGE:
883 return "range";
884 case P_UNKNOWN:
885 break;
886 }
887 return "unknown";
888}
889
890void prop_add_env(const char *env)
891{
892 struct symbol *sym, *sym2;
893 struct property *prop;
894 char *p;
895
896 sym = current_entry->sym;
897 sym->flags |= SYMBOL_AUTO;
898 for_all_properties(sym, prop, P_ENV) {
899 sym2 = prop_get_symbol(prop);
900 if (strcmp(sym2->name, env))
901 menu_warn(current_entry, "redefining environment symbol from %s",
902 sym2->name);
903 return;
904 }
905
906 prop = prop_alloc(P_ENV, sym);
907 prop->expr = expr_alloc_symbol(sym_lookup(env, 1));
908
909 sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
910 sym_env_list->right.sym = sym;
911
912 p = getenv(env);
913 if (p)
914 sym_add_default(sym, p);
915 else
916 menu_warn(current_entry, "environment variable %s undefined", env);
917}
918
