Revert "kconfig: Temporarily disable dependency warnings"
[linux-2.6.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 }