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Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
[mirror_ubuntu-bionic-kernel.git] / scripts / kconfig / symbol.c
1 /*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
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
15 struct 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
33 struct symbol *sym_defconfig_list;
34 struct symbol *modules_sym;
35 tristate modules_val;
36
37 struct expr *sym_env_list;
38
39 static void 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, SYMBOL_CONST));
44 }
45
46 void 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
64 enum 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
77 const 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
98 struct 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
107 struct 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
116 struct 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
128 static struct 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
140 static 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
156 static 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
189 static void sym_calc_visibility(struct symbol *sym)
190 {
191 struct property *prop;
192 tristate tri;
193
194 /* any prompt visible? */
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 /* defaulting to "yes" if no explicit "depends on" are given */
209 tri = yes;
210 if (sym->dir_dep.expr)
211 tri = expr_calc_value(sym->dir_dep.expr);
212 if (tri == mod)
213 tri = yes;
214 if (sym->dir_dep.tri != tri) {
215 sym->dir_dep.tri = tri;
216 sym_set_changed(sym);
217 }
218 tri = no;
219 if (sym->rev_dep.expr)
220 tri = expr_calc_value(sym->rev_dep.expr);
221 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
222 tri = yes;
223 if (sym->rev_dep.tri != tri) {
224 sym->rev_dep.tri = tri;
225 sym_set_changed(sym);
226 }
227 }
228
229 /*
230 * Find the default symbol for a choice.
231 * First try the default values for the choice symbol
232 * Next locate the first visible choice value
233 * Return NULL if none was found
234 */
235 struct symbol *sym_choice_default(struct symbol *sym)
236 {
237 struct symbol *def_sym;
238 struct property *prop;
239 struct expr *e;
240
241 /* any of the defaults visible? */
242 for_all_defaults(sym, prop) {
243 prop->visible.tri = expr_calc_value(prop->visible.expr);
244 if (prop->visible.tri == no)
245 continue;
246 def_sym = prop_get_symbol(prop);
247 if (def_sym->visible != no)
248 return def_sym;
249 }
250
251 /* just get the first visible value */
252 prop = sym_get_choice_prop(sym);
253 expr_list_for_each_sym(prop->expr, e, def_sym)
254 if (def_sym->visible != no)
255 return def_sym;
256
257 /* failed to locate any defaults */
258 return NULL;
259 }
260
261 static struct symbol *sym_calc_choice(struct symbol *sym)
262 {
263 struct symbol *def_sym;
264 struct property *prop;
265 struct expr *e;
266
267 /* first calculate all choice values' visibilities */
268 prop = sym_get_choice_prop(sym);
269 expr_list_for_each_sym(prop->expr, e, def_sym)
270 sym_calc_visibility(def_sym);
271
272 /* is the user choice visible? */
273 def_sym = sym->def[S_DEF_USER].val;
274 if (def_sym && def_sym->visible != no)
275 return def_sym;
276
277 def_sym = sym_choice_default(sym);
278
279 if (def_sym == NULL)
280 /* no choice? reset tristate value */
281 sym->curr.tri = no;
282
283 return def_sym;
284 }
285
286 void sym_calc_value(struct symbol *sym)
287 {
288 struct symbol_value newval, oldval;
289 struct property *prop;
290 struct expr *e;
291
292 if (!sym)
293 return;
294
295 if (sym->flags & SYMBOL_VALID)
296 return;
297 sym->flags |= SYMBOL_VALID;
298
299 oldval = sym->curr;
300
301 switch (sym->type) {
302 case S_INT:
303 case S_HEX:
304 case S_STRING:
305 newval = symbol_empty.curr;
306 break;
307 case S_BOOLEAN:
308 case S_TRISTATE:
309 newval = symbol_no.curr;
310 break;
311 default:
312 sym->curr.val = sym->name;
313 sym->curr.tri = no;
314 return;
315 }
316 if (!sym_is_choice_value(sym))
317 sym->flags &= ~SYMBOL_WRITE;
318
319 sym_calc_visibility(sym);
320
321 /* set default if recursively called */
322 sym->curr = newval;
323
324 switch (sym_get_type(sym)) {
325 case S_BOOLEAN:
326 case S_TRISTATE:
327 if (sym_is_choice_value(sym) && sym->visible == yes) {
328 prop = sym_get_choice_prop(sym);
329 newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
330 } else {
331 if (sym->visible != no) {
332 /* if the symbol is visible use the user value
333 * if available, otherwise try the default value
334 */
335 sym->flags |= SYMBOL_WRITE;
336 if (sym_has_value(sym)) {
337 newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
338 sym->visible);
339 goto calc_newval;
340 }
341 }
342 if (sym->rev_dep.tri != no)
343 sym->flags |= SYMBOL_WRITE;
344 if (!sym_is_choice(sym)) {
345 prop = sym_get_default_prop(sym);
346 if (prop) {
347 sym->flags |= SYMBOL_WRITE;
348 newval.tri = EXPR_AND(expr_calc_value(prop->expr),
349 prop->visible.tri);
350 }
351 }
352 calc_newval:
353 if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
354 fprintf(stderr, "warning: (");
355 expr_fprint(sym->rev_dep.expr, stderr);
356 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
357 sym->name);
358 expr_fprint(sym->dir_dep.expr, stderr);
359 fprintf(stderr, ")\n");
360 }
361 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
362 }
363 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
364 newval.tri = yes;
365 break;
366 case S_STRING:
367 case S_HEX:
368 case S_INT:
369 if (sym->visible != no) {
370 sym->flags |= SYMBOL_WRITE;
371 if (sym_has_value(sym)) {
372 newval.val = sym->def[S_DEF_USER].val;
373 break;
374 }
375 }
376 prop = sym_get_default_prop(sym);
377 if (prop) {
378 struct symbol *ds = prop_get_symbol(prop);
379 if (ds) {
380 sym->flags |= SYMBOL_WRITE;
381 sym_calc_value(ds);
382 newval.val = ds->curr.val;
383 }
384 }
385 break;
386 default:
387 ;
388 }
389
390 sym->curr = newval;
391 if (sym_is_choice(sym) && newval.tri == yes)
392 sym->curr.val = sym_calc_choice(sym);
393 sym_validate_range(sym);
394
395 if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
396 sym_set_changed(sym);
397 if (modules_sym == sym) {
398 sym_set_all_changed();
399 modules_val = modules_sym->curr.tri;
400 }
401 }
402
403 if (sym_is_choice(sym)) {
404 struct symbol *choice_sym;
405
406 prop = sym_get_choice_prop(sym);
407 expr_list_for_each_sym(prop->expr, e, choice_sym) {
408 if ((sym->flags & SYMBOL_WRITE) &&
409 choice_sym->visible != no)
410 choice_sym->flags |= SYMBOL_WRITE;
411 if (sym->flags & SYMBOL_CHANGED)
412 sym_set_changed(choice_sym);
413 }
414 }
415
416 if (sym->flags & SYMBOL_AUTO)
417 sym->flags &= ~SYMBOL_WRITE;
418 }
419
420 void sym_clear_all_valid(void)
421 {
422 struct symbol *sym;
423 int i;
424
425 for_all_symbols(i, sym)
426 sym->flags &= ~SYMBOL_VALID;
427 sym_add_change_count(1);
428 if (modules_sym)
429 sym_calc_value(modules_sym);
430 }
431
432 void sym_set_changed(struct symbol *sym)
433 {
434 struct property *prop;
435
436 sym->flags |= SYMBOL_CHANGED;
437 for (prop = sym->prop; prop; prop = prop->next) {
438 if (prop->menu)
439 prop->menu->flags |= MENU_CHANGED;
440 }
441 }
442
443 void sym_set_all_changed(void)
444 {
445 struct symbol *sym;
446 int i;
447
448 for_all_symbols(i, sym)
449 sym_set_changed(sym);
450 }
451
452 bool sym_tristate_within_range(struct symbol *sym, tristate val)
453 {
454 int type = sym_get_type(sym);
455
456 if (sym->visible == no)
457 return false;
458
459 if (type != S_BOOLEAN && type != S_TRISTATE)
460 return false;
461
462 if (type == S_BOOLEAN && val == mod)
463 return false;
464 if (sym->visible <= sym->rev_dep.tri)
465 return false;
466 if (sym_is_choice_value(sym) && sym->visible == yes)
467 return val == yes;
468 return val >= sym->rev_dep.tri && val <= sym->visible;
469 }
470
471 bool sym_set_tristate_value(struct symbol *sym, tristate val)
472 {
473 tristate oldval = sym_get_tristate_value(sym);
474
475 if (oldval != val && !sym_tristate_within_range(sym, val))
476 return false;
477
478 if (!(sym->flags & SYMBOL_DEF_USER)) {
479 sym->flags |= SYMBOL_DEF_USER;
480 sym_set_changed(sym);
481 }
482 /*
483 * setting a choice value also resets the new flag of the choice
484 * symbol and all other choice values.
485 */
486 if (sym_is_choice_value(sym) && val == yes) {
487 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
488 struct property *prop;
489 struct expr *e;
490
491 cs->def[S_DEF_USER].val = sym;
492 cs->flags |= SYMBOL_DEF_USER;
493 prop = sym_get_choice_prop(cs);
494 for (e = prop->expr; e; e = e->left.expr) {
495 if (e->right.sym->visible != no)
496 e->right.sym->flags |= SYMBOL_DEF_USER;
497 }
498 }
499
500 sym->def[S_DEF_USER].tri = val;
501 if (oldval != val)
502 sym_clear_all_valid();
503
504 return true;
505 }
506
507 tristate sym_toggle_tristate_value(struct symbol *sym)
508 {
509 tristate oldval, newval;
510
511 oldval = newval = sym_get_tristate_value(sym);
512 do {
513 switch (newval) {
514 case no:
515 newval = mod;
516 break;
517 case mod:
518 newval = yes;
519 break;
520 case yes:
521 newval = no;
522 break;
523 }
524 if (sym_set_tristate_value(sym, newval))
525 break;
526 } while (oldval != newval);
527 return newval;
528 }
529
530 bool sym_string_valid(struct symbol *sym, const char *str)
531 {
532 signed char ch;
533
534 switch (sym->type) {
535 case S_STRING:
536 return true;
537 case S_INT:
538 ch = *str++;
539 if (ch == '-')
540 ch = *str++;
541 if (!isdigit(ch))
542 return false;
543 if (ch == '0' && *str != 0)
544 return false;
545 while ((ch = *str++)) {
546 if (!isdigit(ch))
547 return false;
548 }
549 return true;
550 case S_HEX:
551 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
552 str += 2;
553 ch = *str++;
554 do {
555 if (!isxdigit(ch))
556 return false;
557 } while ((ch = *str++));
558 return true;
559 case S_BOOLEAN:
560 case S_TRISTATE:
561 switch (str[0]) {
562 case 'y': case 'Y':
563 case 'm': case 'M':
564 case 'n': case 'N':
565 return true;
566 }
567 return false;
568 default:
569 return false;
570 }
571 }
572
573 bool sym_string_within_range(struct symbol *sym, const char *str)
574 {
575 struct property *prop;
576 int val;
577
578 switch (sym->type) {
579 case S_STRING:
580 return sym_string_valid(sym, str);
581 case S_INT:
582 if (!sym_string_valid(sym, str))
583 return false;
584 prop = sym_get_range_prop(sym);
585 if (!prop)
586 return true;
587 val = strtol(str, NULL, 10);
588 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
589 val <= sym_get_range_val(prop->expr->right.sym, 10);
590 case S_HEX:
591 if (!sym_string_valid(sym, str))
592 return false;
593 prop = sym_get_range_prop(sym);
594 if (!prop)
595 return true;
596 val = strtol(str, NULL, 16);
597 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
598 val <= sym_get_range_val(prop->expr->right.sym, 16);
599 case S_BOOLEAN:
600 case S_TRISTATE:
601 switch (str[0]) {
602 case 'y': case 'Y':
603 return sym_tristate_within_range(sym, yes);
604 case 'm': case 'M':
605 return sym_tristate_within_range(sym, mod);
606 case 'n': case 'N':
607 return sym_tristate_within_range(sym, no);
608 }
609 return false;
610 default:
611 return false;
612 }
613 }
614
615 bool sym_set_string_value(struct symbol *sym, const char *newval)
616 {
617 const char *oldval;
618 char *val;
619 int size;
620
621 switch (sym->type) {
622 case S_BOOLEAN:
623 case S_TRISTATE:
624 switch (newval[0]) {
625 case 'y': case 'Y':
626 return sym_set_tristate_value(sym, yes);
627 case 'm': case 'M':
628 return sym_set_tristate_value(sym, mod);
629 case 'n': case 'N':
630 return sym_set_tristate_value(sym, no);
631 }
632 return false;
633 default:
634 ;
635 }
636
637 if (!sym_string_within_range(sym, newval))
638 return false;
639
640 if (!(sym->flags & SYMBOL_DEF_USER)) {
641 sym->flags |= SYMBOL_DEF_USER;
642 sym_set_changed(sym);
643 }
644
645 oldval = sym->def[S_DEF_USER].val;
646 size = strlen(newval) + 1;
647 if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
648 size += 2;
649 sym->def[S_DEF_USER].val = val = malloc(size);
650 *val++ = '0';
651 *val++ = 'x';
652 } else if (!oldval || strcmp(oldval, newval))
653 sym->def[S_DEF_USER].val = val = malloc(size);
654 else
655 return true;
656
657 strcpy(val, newval);
658 free((void *)oldval);
659 sym_clear_all_valid();
660
661 return true;
662 }
663
664 /*
665 * Find the default value associated to a symbol.
666 * For tristate symbol handle the modules=n case
667 * in which case "m" becomes "y".
668 * If the symbol does not have any default then fallback
669 * to the fixed default values.
670 */
671 const char *sym_get_string_default(struct symbol *sym)
672 {
673 struct property *prop;
674 struct symbol *ds;
675 const char *str;
676 tristate val;
677
678 sym_calc_visibility(sym);
679 sym_calc_value(modules_sym);
680 val = symbol_no.curr.tri;
681 str = symbol_empty.curr.val;
682
683 /* If symbol has a default value look it up */
684 prop = sym_get_default_prop(sym);
685 if (prop != NULL) {
686 switch (sym->type) {
687 case S_BOOLEAN:
688 case S_TRISTATE:
689 /* The visibility imay limit the value from yes => mod */
690 val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
691 break;
692 default:
693 /*
694 * The following fails to handle the situation
695 * where a default value is further limited by
696 * the valid range.
697 */
698 ds = prop_get_symbol(prop);
699 if (ds != NULL) {
700 sym_calc_value(ds);
701 str = (const char *)ds->curr.val;
702 }
703 }
704 }
705
706 /* Handle select statements */
707 val = EXPR_OR(val, sym->rev_dep.tri);
708
709 /* transpose mod to yes if modules are not enabled */
710 if (val == mod)
711 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
712 val = yes;
713
714 /* transpose mod to yes if type is bool */
715 if (sym->type == S_BOOLEAN && val == mod)
716 val = yes;
717
718 switch (sym->type) {
719 case S_BOOLEAN:
720 case S_TRISTATE:
721 switch (val) {
722 case no: return "n";
723 case mod: return "m";
724 case yes: return "y";
725 }
726 case S_INT:
727 case S_HEX:
728 return str;
729 case S_STRING:
730 return str;
731 case S_OTHER:
732 case S_UNKNOWN:
733 break;
734 }
735 return "";
736 }
737
738 const char *sym_get_string_value(struct symbol *sym)
739 {
740 tristate val;
741
742 switch (sym->type) {
743 case S_BOOLEAN:
744 case S_TRISTATE:
745 val = sym_get_tristate_value(sym);
746 switch (val) {
747 case no:
748 return "n";
749 case mod:
750 return "m";
751 case yes:
752 return "y";
753 }
754 break;
755 default:
756 ;
757 }
758 return (const char *)sym->curr.val;
759 }
760
761 bool sym_is_changable(struct symbol *sym)
762 {
763 return sym->visible > sym->rev_dep.tri;
764 }
765
766 static unsigned strhash(const char *s)
767 {
768 /* fnv32 hash */
769 unsigned hash = 2166136261U;
770 for (; *s; s++)
771 hash = (hash ^ *s) * 0x01000193;
772 return hash;
773 }
774
775 struct symbol *sym_lookup(const char *name, int flags)
776 {
777 struct symbol *symbol;
778 char *new_name;
779 int hash;
780
781 if (name) {
782 if (name[0] && !name[1]) {
783 switch (name[0]) {
784 case 'y': return &symbol_yes;
785 case 'm': return &symbol_mod;
786 case 'n': return &symbol_no;
787 }
788 }
789 hash = strhash(name) % SYMBOL_HASHSIZE;
790
791 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
792 if (symbol->name &&
793 !strcmp(symbol->name, name) &&
794 (flags ? symbol->flags & flags
795 : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
796 return symbol;
797 }
798 new_name = strdup(name);
799 } else {
800 new_name = NULL;
801 hash = 0;
802 }
803
804 symbol = malloc(sizeof(*symbol));
805 memset(symbol, 0, sizeof(*symbol));
806 symbol->name = new_name;
807 symbol->type = S_UNKNOWN;
808 symbol->flags |= flags;
809
810 symbol->next = symbol_hash[hash];
811 symbol_hash[hash] = symbol;
812
813 return symbol;
814 }
815
816 struct symbol *sym_find(const char *name)
817 {
818 struct symbol *symbol = NULL;
819 int hash = 0;
820
821 if (!name)
822 return NULL;
823
824 if (name[0] && !name[1]) {
825 switch (name[0]) {
826 case 'y': return &symbol_yes;
827 case 'm': return &symbol_mod;
828 case 'n': return &symbol_no;
829 }
830 }
831 hash = strhash(name) % SYMBOL_HASHSIZE;
832
833 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
834 if (symbol->name &&
835 !strcmp(symbol->name, name) &&
836 !(symbol->flags & SYMBOL_CONST))
837 break;
838 }
839
840 return symbol;
841 }
842
843 /*
844 * Expand symbol's names embedded in the string given in argument. Symbols'
845 * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
846 * the empty string.
847 */
848 const char *sym_expand_string_value(const char *in)
849 {
850 const char *src;
851 char *res;
852 size_t reslen;
853
854 reslen = strlen(in) + 1;
855 res = malloc(reslen);
856 res[0] = '\0';
857
858 while ((src = strchr(in, '$'))) {
859 char *p, name[SYMBOL_MAXLENGTH];
860 const char *symval = "";
861 struct symbol *sym;
862 size_t newlen;
863
864 strncat(res, in, src - in);
865 src++;
866
867 p = name;
868 while (isalnum(*src) || *src == '_')
869 *p++ = *src++;
870 *p = '\0';
871
872 sym = sym_find(name);
873 if (sym != NULL) {
874 sym_calc_value(sym);
875 symval = sym_get_string_value(sym);
876 }
877
878 newlen = strlen(res) + strlen(symval) + strlen(src);
879 if (newlen > reslen) {
880 reslen = newlen;
881 res = realloc(res, reslen);
882 }
883
884 strcat(res, symval);
885 in = src;
886 }
887 strcat(res, in);
888
889 return res;
890 }
891
892 struct symbol **sym_re_search(const char *pattern)
893 {
894 struct symbol *sym, **sym_arr = NULL;
895 int i, cnt, size;
896 regex_t re;
897
898 cnt = size = 0;
899 /* Skip if empty */
900 if (strlen(pattern) == 0)
901 return NULL;
902 if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
903 return NULL;
904
905 for_all_symbols(i, sym) {
906 if (sym->flags & SYMBOL_CONST || !sym->name)
907 continue;
908 if (regexec(&re, sym->name, 0, NULL, 0))
909 continue;
910 if (cnt + 1 >= size) {
911 void *tmp = sym_arr;
912 size += 16;
913 sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
914 if (!sym_arr) {
915 free(tmp);
916 return NULL;
917 }
918 }
919 sym_calc_value(sym);
920 sym_arr[cnt++] = sym;
921 }
922 if (sym_arr)
923 sym_arr[cnt] = NULL;
924 regfree(&re);
925
926 return sym_arr;
927 }
928
929 /*
930 * When we check for recursive dependencies we use a stack to save
931 * current state so we can print out relevant info to user.
932 * The entries are located on the call stack so no need to free memory.
933 * Note inser() remove() must always match to properly clear the stack.
934 */
935 static struct dep_stack {
936 struct dep_stack *prev, *next;
937 struct symbol *sym;
938 struct property *prop;
939 struct expr *expr;
940 } *check_top;
941
942 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
943 {
944 memset(stack, 0, sizeof(*stack));
945 if (check_top)
946 check_top->next = stack;
947 stack->prev = check_top;
948 stack->sym = sym;
949 check_top = stack;
950 }
951
952 static void dep_stack_remove(void)
953 {
954 check_top = check_top->prev;
955 if (check_top)
956 check_top->next = NULL;
957 }
958
959 /*
960 * Called when we have detected a recursive dependency.
961 * check_top point to the top of the stact so we use
962 * the ->prev pointer to locate the bottom of the stack.
963 */
964 static void sym_check_print_recursive(struct symbol *last_sym)
965 {
966 struct dep_stack *stack;
967 struct symbol *sym, *next_sym;
968 struct menu *menu = NULL;
969 struct property *prop;
970 struct dep_stack cv_stack;
971
972 if (sym_is_choice_value(last_sym)) {
973 dep_stack_insert(&cv_stack, last_sym);
974 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
975 }
976
977 for (stack = check_top; stack != NULL; stack = stack->prev)
978 if (stack->sym == last_sym)
979 break;
980 if (!stack) {
981 fprintf(stderr, "unexpected recursive dependency error\n");
982 return;
983 }
984
985 for (; stack; stack = stack->next) {
986 sym = stack->sym;
987 next_sym = stack->next ? stack->next->sym : last_sym;
988 prop = stack->prop;
989 if (prop == NULL)
990 prop = stack->sym->prop;
991
992 /* for choice values find the menu entry (used below) */
993 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
994 for (prop = sym->prop; prop; prop = prop->next) {
995 menu = prop->menu;
996 if (prop->menu)
997 break;
998 }
999 }
1000 if (stack->sym == last_sym)
1001 fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1002 prop->file->name, prop->lineno);
1003 if (stack->expr) {
1004 fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1005 prop->file->name, prop->lineno,
1006 sym->name ? sym->name : "<choice>",
1007 prop_get_type_name(prop->type),
1008 next_sym->name ? next_sym->name : "<choice>");
1009 } else if (stack->prop) {
1010 fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1011 prop->file->name, prop->lineno,
1012 sym->name ? sym->name : "<choice>",
1013 next_sym->name ? next_sym->name : "<choice>");
1014 } else if (sym_is_choice(sym)) {
1015 fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1016 menu->file->name, menu->lineno,
1017 sym->name ? sym->name : "<choice>",
1018 next_sym->name ? next_sym->name : "<choice>");
1019 } else if (sym_is_choice_value(sym)) {
1020 fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1021 menu->file->name, menu->lineno,
1022 sym->name ? sym->name : "<choice>",
1023 next_sym->name ? next_sym->name : "<choice>");
1024 } else {
1025 fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1026 prop->file->name, prop->lineno,
1027 sym->name ? sym->name : "<choice>",
1028 next_sym->name ? next_sym->name : "<choice>");
1029 }
1030 }
1031
1032 if (check_top == &cv_stack)
1033 dep_stack_remove();
1034 }
1035
1036 static struct symbol *sym_check_expr_deps(struct expr *e)
1037 {
1038 struct symbol *sym;
1039
1040 if (!e)
1041 return NULL;
1042 switch (e->type) {
1043 case E_OR:
1044 case E_AND:
1045 sym = sym_check_expr_deps(e->left.expr);
1046 if (sym)
1047 return sym;
1048 return sym_check_expr_deps(e->right.expr);
1049 case E_NOT:
1050 return sym_check_expr_deps(e->left.expr);
1051 case E_EQUAL:
1052 case E_UNEQUAL:
1053 sym = sym_check_deps(e->left.sym);
1054 if (sym)
1055 return sym;
1056 return sym_check_deps(e->right.sym);
1057 case E_SYMBOL:
1058 return sym_check_deps(e->left.sym);
1059 default:
1060 break;
1061 }
1062 printf("Oops! How to check %d?\n", e->type);
1063 return NULL;
1064 }
1065
1066 /* return NULL when dependencies are OK */
1067 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1068 {
1069 struct symbol *sym2;
1070 struct property *prop;
1071 struct dep_stack stack;
1072
1073 dep_stack_insert(&stack, sym);
1074
1075 sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1076 if (sym2)
1077 goto out;
1078
1079 for (prop = sym->prop; prop; prop = prop->next) {
1080 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1081 continue;
1082 stack.prop = prop;
1083 sym2 = sym_check_expr_deps(prop->visible.expr);
1084 if (sym2)
1085 break;
1086 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1087 continue;
1088 stack.expr = prop->expr;
1089 sym2 = sym_check_expr_deps(prop->expr);
1090 if (sym2)
1091 break;
1092 stack.expr = NULL;
1093 }
1094
1095 out:
1096 dep_stack_remove();
1097
1098 return sym2;
1099 }
1100
1101 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1102 {
1103 struct symbol *sym, *sym2;
1104 struct property *prop;
1105 struct expr *e;
1106 struct dep_stack stack;
1107
1108 dep_stack_insert(&stack, choice);
1109
1110 prop = sym_get_choice_prop(choice);
1111 expr_list_for_each_sym(prop->expr, e, sym)
1112 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1113
1114 choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1115 sym2 = sym_check_sym_deps(choice);
1116 choice->flags &= ~SYMBOL_CHECK;
1117 if (sym2)
1118 goto out;
1119
1120 expr_list_for_each_sym(prop->expr, e, sym) {
1121 sym2 = sym_check_sym_deps(sym);
1122 if (sym2)
1123 break;
1124 }
1125 out:
1126 expr_list_for_each_sym(prop->expr, e, sym)
1127 sym->flags &= ~SYMBOL_CHECK;
1128
1129 if (sym2 && sym_is_choice_value(sym2) &&
1130 prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1131 sym2 = choice;
1132
1133 dep_stack_remove();
1134
1135 return sym2;
1136 }
1137
1138 struct symbol *sym_check_deps(struct symbol *sym)
1139 {
1140 struct symbol *sym2;
1141 struct property *prop;
1142
1143 if (sym->flags & SYMBOL_CHECK) {
1144 sym_check_print_recursive(sym);
1145 return sym;
1146 }
1147 if (sym->flags & SYMBOL_CHECKED)
1148 return NULL;
1149
1150 if (sym_is_choice_value(sym)) {
1151 struct dep_stack stack;
1152
1153 /* for choice groups start the check with main choice symbol */
1154 dep_stack_insert(&stack, sym);
1155 prop = sym_get_choice_prop(sym);
1156 sym2 = sym_check_deps(prop_get_symbol(prop));
1157 dep_stack_remove();
1158 } else if (sym_is_choice(sym)) {
1159 sym2 = sym_check_choice_deps(sym);
1160 } else {
1161 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1162 sym2 = sym_check_sym_deps(sym);
1163 sym->flags &= ~SYMBOL_CHECK;
1164 }
1165
1166 if (sym2 && sym2 == sym)
1167 sym2 = NULL;
1168
1169 return sym2;
1170 }
1171
1172 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1173 {
1174 struct property *prop;
1175 struct property **propp;
1176
1177 prop = malloc(sizeof(*prop));
1178 memset(prop, 0, sizeof(*prop));
1179 prop->type = type;
1180 prop->sym = sym;
1181 prop->file = current_file;
1182 prop->lineno = zconf_lineno();
1183
1184 /* append property to the prop list of symbol */
1185 if (sym) {
1186 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1187 ;
1188 *propp = prop;
1189 }
1190
1191 return prop;
1192 }
1193
1194 struct symbol *prop_get_symbol(struct property *prop)
1195 {
1196 if (prop->expr && (prop->expr->type == E_SYMBOL ||
1197 prop->expr->type == E_LIST))
1198 return prop->expr->left.sym;
1199 return NULL;
1200 }
1201
1202 const char *prop_get_type_name(enum prop_type type)
1203 {
1204 switch (type) {
1205 case P_PROMPT:
1206 return "prompt";
1207 case P_ENV:
1208 return "env";
1209 case P_COMMENT:
1210 return "comment";
1211 case P_MENU:
1212 return "menu";
1213 case P_DEFAULT:
1214 return "default";
1215 case P_CHOICE:
1216 return "choice";
1217 case P_SELECT:
1218 return "select";
1219 case P_RANGE:
1220 return "range";
1221 case P_SYMBOL:
1222 return "symbol";
1223 case P_UNKNOWN:
1224 break;
1225 }
1226 return "unknown";
1227 }
1228
1229 static void prop_add_env(const char *env)
1230 {
1231 struct symbol *sym, *sym2;
1232 struct property *prop;
1233 char *p;
1234
1235 sym = current_entry->sym;
1236 sym->flags |= SYMBOL_AUTO;
1237 for_all_properties(sym, prop, P_ENV) {
1238 sym2 = prop_get_symbol(prop);
1239 if (strcmp(sym2->name, env))
1240 menu_warn(current_entry, "redefining environment symbol from %s",
1241 sym2->name);
1242 return;
1243 }
1244
1245 prop = prop_alloc(P_ENV, sym);
1246 prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1247
1248 sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1249 sym_env_list->right.sym = sym;
1250
1251 p = getenv(env);
1252 if (p)
1253 sym_add_default(sym, p);
1254 else
1255 menu_warn(current_entry, "environment variable %s undefined", env);
1256 }