iw: Update to version 5.3
[oweals/openwrt.git] / scripts / config / 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 #include "lkc.h"
13
14 struct symbol symbol_yes = {
15         .name = "y",
16         .curr = { "y", yes },
17         .flags = SYMBOL_CONST|SYMBOL_VALID,
18 }, symbol_mod = {
19         .name = "m",
20         .curr = { "m", mod },
21         .flags = SYMBOL_CONST|SYMBOL_VALID,
22 }, symbol_no = {
23         .name = "n",
24         .curr = { "n", no },
25         .flags = SYMBOL_CONST|SYMBOL_VALID,
26 }, symbol_empty = {
27         .name = "",
28         .curr = { "", no },
29         .flags = SYMBOL_VALID,
30 };
31
32 struct symbol *sym_defconfig_list;
33 struct symbol *modules_sym;
34 tristate modules_val;
35
36 struct expr *sym_env_list;
37
38 static void sym_add_default(struct symbol *sym, const char *def)
39 {
40         struct property *prop = prop_alloc(P_DEFAULT, sym);
41
42         prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
43 }
44
45 void sym_init(void)
46 {
47         struct symbol *sym;
48         struct utsname uts;
49         static bool inited = false;
50
51         if (inited)
52                 return;
53         inited = true;
54
55         uname(&uts);
56
57         sym = sym_lookup("UNAME_RELEASE", 0);
58         sym->type = S_STRING;
59         sym->flags |= SYMBOL_AUTO;
60         sym_add_default(sym, uts.release);
61 }
62
63 enum symbol_type sym_get_type(struct symbol *sym)
64 {
65         enum symbol_type type = sym->type;
66
67         if (type == S_TRISTATE) {
68                 if (sym_is_choice_value(sym) && sym->visible == yes)
69                         type = S_BOOLEAN;
70                 else if (modules_val == no)
71                         type = S_BOOLEAN;
72         }
73         return type;
74 }
75
76 const char *sym_type_name(enum symbol_type type)
77 {
78         switch (type) {
79         case S_BOOLEAN:
80                 return "boolean";
81         case S_TRISTATE:
82                 return "tristate";
83         case S_INT:
84                 return "integer";
85         case S_HEX:
86                 return "hex";
87         case S_STRING:
88                 return "string";
89         case S_UNKNOWN:
90                 return "unknown";
91         case S_OTHER:
92                 break;
93         }
94         return "???";
95 }
96
97 struct property *sym_get_choice_prop(struct symbol *sym)
98 {
99         struct property *prop;
100
101         for_all_choices(sym, prop)
102                 return prop;
103         return NULL;
104 }
105
106 struct property *sym_get_env_prop(struct symbol *sym)
107 {
108         struct property *prop;
109
110         for_all_properties(sym, prop, P_ENV)
111                 return prop;
112         return NULL;
113 }
114
115 static struct property *sym_get_default_prop(struct symbol *sym)
116 {
117         struct property *prop;
118
119         for_all_defaults(sym, prop) {
120                 prop->visible.tri = expr_calc_value(prop->visible.expr);
121                 if (prop->visible.tri != no)
122                         return prop;
123         }
124         return NULL;
125 }
126
127 static struct property *sym_get_range_prop(struct symbol *sym)
128 {
129         struct property *prop;
130
131         for_all_properties(sym, prop, P_RANGE) {
132                 prop->visible.tri = expr_calc_value(prop->visible.expr);
133                 if (prop->visible.tri != no)
134                         return prop;
135         }
136         return NULL;
137 }
138
139 static long long sym_get_range_val(struct symbol *sym, int base)
140 {
141         sym_calc_value(sym);
142         switch (sym->type) {
143         case S_INT:
144                 base = 10;
145                 break;
146         case S_HEX:
147                 base = 16;
148                 break;
149         default:
150                 break;
151         }
152         return strtoll(sym->curr.val, NULL, base);
153 }
154
155 static void sym_validate_range(struct symbol *sym)
156 {
157         struct property *prop;
158         int base;
159         long long 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 = strtoll(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, "%lld", val2);
184         else
185                 sprintf(str, "0x%llx", val2);
186         sym->curr.val = strdup(str);
187 }
188
189 static void sym_set_changed(struct symbol *sym)
190 {
191         struct property *prop;
192
193         sym->flags |= SYMBOL_CHANGED;
194         for (prop = sym->prop; prop; prop = prop->next) {
195                 if (prop->menu)
196                         prop->menu->flags |= MENU_CHANGED;
197         }
198 }
199
200 static void sym_set_all_changed(void)
201 {
202         struct symbol *sym;
203         int i;
204
205         for_all_symbols(i, sym)
206                 sym_set_changed(sym);
207 }
208
209 static void sym_calc_visibility(struct symbol *sym)
210 {
211         struct property *prop;
212         struct symbol *choice_sym = NULL;
213         tristate tri;
214
215         /* any prompt visible? */
216         tri = no;
217
218         if (sym_is_choice_value(sym))
219                 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
220
221         for_all_prompts(sym, prop) {
222                 prop->visible.tri = expr_calc_value(prop->visible.expr);
223                 /*
224                  * Tristate choice_values with visibility 'mod' are
225                  * not visible if the corresponding choice's value is
226                  * 'yes'.
227                  */
228                 if (choice_sym && sym->type == S_TRISTATE &&
229                     prop->visible.tri == mod && choice_sym->curr.tri == yes)
230                         prop->visible.tri = no;
231
232                 tri = EXPR_OR(tri, prop->visible.tri);
233         }
234         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
235                 tri = yes;
236         if (sym->visible != tri) {
237                 sym->visible = tri;
238                 sym_set_changed(sym);
239         }
240         if (sym_is_choice_value(sym))
241                 return;
242         /* defaulting to "yes" if no explicit "depends on" are given */
243         tri = yes;
244         if (sym->dir_dep.expr)
245                 tri = expr_calc_value(sym->dir_dep.expr);
246         if (tri == mod)
247                 tri = yes;
248         if (sym->dir_dep.tri != tri) {
249                 sym->dir_dep.tri = tri;
250                 sym_set_changed(sym);
251         }
252         tri = no;
253         if (sym->rev_dep.expr)
254                 tri = expr_calc_value(sym->rev_dep.expr);
255         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
256                 tri = yes;
257         if (sym->rev_dep.tri != tri) {
258                 sym->rev_dep.tri = tri;
259                 sym_set_changed(sym);
260         }
261 }
262
263 /*
264  * Find the default symbol for a choice.
265  * First try the default values for the choice symbol
266  * Next locate the first visible choice value
267  * Return NULL if none was found
268  */
269 struct symbol *sym_choice_default(struct symbol *sym)
270 {
271         struct symbol *def_sym;
272         struct property *prop;
273         struct expr *e;
274
275         /* any of the defaults visible? */
276         for_all_defaults(sym, prop) {
277                 prop->visible.tri = expr_calc_value(prop->visible.expr);
278                 if (prop->visible.tri == no)
279                         continue;
280                 def_sym = prop_get_symbol(prop);
281                 if (def_sym->visible != no)
282                         return def_sym;
283         }
284
285         /* just get the first visible value */
286         prop = sym_get_choice_prop(sym);
287         expr_list_for_each_sym(prop->expr, e, def_sym)
288                 if (def_sym->visible != no)
289                         return def_sym;
290
291         /* failed to locate any defaults */
292         return NULL;
293 }
294
295 static struct symbol *sym_calc_choice(struct symbol *sym)
296 {
297         struct symbol *def_sym;
298         struct property *prop;
299         struct expr *e;
300         int flags;
301
302         /* first calculate all choice values' visibilities */
303         flags = sym->flags;
304         prop = sym_get_choice_prop(sym);
305         expr_list_for_each_sym(prop->expr, e, def_sym) {
306                 sym_calc_visibility(def_sym);
307                 if (def_sym->visible != no)
308                         flags &= def_sym->flags;
309         }
310
311         sym->flags &= flags | ~SYMBOL_DEF_USER;
312
313         /* is the user choice visible? */
314         def_sym = sym->def[S_DEF_USER].val;
315         if (def_sym && def_sym->visible != no)
316                 return def_sym;
317
318         def_sym = sym_choice_default(sym);
319
320         if (def_sym == NULL)
321                 /* no choice? reset tristate value */
322                 sym->curr.tri = no;
323
324         return def_sym;
325 }
326
327 void sym_calc_value(struct symbol *sym)
328 {
329         struct symbol_value newval, oldval;
330         struct property *prop;
331         struct expr *e;
332
333         if (!sym)
334                 return;
335
336         if (sym->flags & SYMBOL_VALID)
337                 return;
338
339         if (sym_is_choice_value(sym) &&
340             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
341                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
342                 prop = sym_get_choice_prop(sym);
343                 sym_calc_value(prop_get_symbol(prop));
344         }
345
346         sym->flags |= SYMBOL_VALID;
347
348         oldval = sym->curr;
349
350         switch (sym->type) {
351         case S_INT:
352         case S_HEX:
353         case S_STRING:
354                 newval = symbol_empty.curr;
355                 break;
356         case S_BOOLEAN:
357         case S_TRISTATE:
358                 newval = symbol_no.curr;
359                 break;
360         default:
361                 sym->curr.val = sym->name;
362                 sym->curr.tri = no;
363                 return;
364         }
365         if (!sym_is_choice_value(sym))
366                 sym->flags &= ~SYMBOL_WRITE;
367
368         sym_calc_visibility(sym);
369
370         /* set default if recursively called */
371         sym->curr = newval;
372
373         switch (sym_get_type(sym)) {
374         case S_BOOLEAN:
375         case S_TRISTATE:
376                 if (sym_is_choice_value(sym) && sym->visible == yes) {
377                         prop = sym_get_choice_prop(sym);
378                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
379                 } else {
380                         if (sym->visible != no) {
381                                 /* if the symbol is visible use the user value
382                                  * if available, otherwise try the default value
383                                  */
384                                 sym->flags |= SYMBOL_WRITE;
385                                 if (sym_has_value(sym)) {
386                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
387                                                               sym->visible);
388                                         goto calc_newval;
389                                 }
390                         }
391                         if (sym->rev_dep.tri != no)
392                                 sym->flags |= SYMBOL_WRITE;
393                         if (!sym_is_choice(sym)) {
394                                 prop = sym_get_default_prop(sym);
395                                 if (prop) {
396                                         sym->flags |= SYMBOL_WRITE;
397                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
398                                                               prop->visible.tri);
399                                 }
400                         }
401                 calc_newval:
402                         if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
403                                 newval.tri = no;
404                         } else {
405                                 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
406                         }
407                 }
408                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
409                         newval.tri = yes;
410                 break;
411         case S_STRING:
412         case S_HEX:
413         case S_INT:
414                 if (sym->visible != no) {
415                         sym->flags |= SYMBOL_WRITE;
416                         if (sym_has_value(sym)) {
417                                 newval.val = sym->def[S_DEF_USER].val;
418                                 break;
419                         }
420                 }
421                 prop = sym_get_default_prop(sym);
422                 if (prop) {
423                         struct symbol *ds = prop_get_symbol(prop);
424                         if (ds) {
425                                 sym->flags |= SYMBOL_WRITE;
426                                 sym_calc_value(ds);
427                                 newval.val = ds->curr.val;
428                         }
429                 }
430                 break;
431         default:
432                 ;
433         }
434
435         sym->curr = newval;
436         if (sym_is_choice(sym) && newval.tri == yes)
437                 sym->curr.val = sym_calc_choice(sym);
438         sym_validate_range(sym);
439
440         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
441                 sym_set_changed(sym);
442                 if (modules_sym == sym) {
443                         sym_set_all_changed();
444                         modules_val = modules_sym->curr.tri;
445                 }
446         }
447
448         if (sym_is_choice(sym)) {
449                 struct symbol *choice_sym;
450
451                 prop = sym_get_choice_prop(sym);
452                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
453                         if ((sym->flags & SYMBOL_WRITE) &&
454                             choice_sym->visible != no)
455                                 choice_sym->flags |= SYMBOL_WRITE;
456                         if (sym->flags & SYMBOL_CHANGED)
457                                 sym_set_changed(choice_sym);
458                 }
459         }
460
461         if (sym->flags & SYMBOL_AUTO)
462                 sym->flags &= ~SYMBOL_WRITE;
463
464         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
465                 set_all_choice_values(sym);
466 }
467
468 void sym_clear_all_valid(void)
469 {
470         struct symbol *sym;
471         int i;
472
473         for_all_symbols(i, sym)
474                 sym->flags &= ~SYMBOL_VALID;
475         sym_add_change_count(1);
476         sym_calc_value(modules_sym);
477 }
478
479 bool sym_tristate_within_range(struct symbol *sym, tristate val)
480 {
481         int type = sym_get_type(sym);
482
483         if (sym->visible == no)
484                 return false;
485
486         if (type != S_BOOLEAN && type != S_TRISTATE)
487                 return false;
488
489         if (type == S_BOOLEAN && val == mod)
490                 return false;
491         if (sym->visible <= sym->rev_dep.tri)
492                 return false;
493         if (sym_is_choice_value(sym) && sym->visible == yes)
494                 return val == yes;
495         return val >= sym->rev_dep.tri && val <= sym->visible;
496 }
497
498 bool sym_set_tristate_value(struct symbol *sym, tristate val)
499 {
500         tristate oldval = sym_get_tristate_value(sym);
501
502         if (oldval != val && !sym_tristate_within_range(sym, val))
503                 return false;
504
505         if (!(sym->flags & SYMBOL_DEF_USER)) {
506                 sym->flags |= SYMBOL_DEF_USER;
507                 sym_set_changed(sym);
508         }
509         /*
510          * setting a choice value also resets the new flag of the choice
511          * symbol and all other choice values.
512          */
513         if (sym_is_choice_value(sym) && val == yes) {
514                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
515                 struct property *prop;
516                 struct expr *e;
517
518                 cs->def[S_DEF_USER].val = sym;
519                 cs->flags |= SYMBOL_DEF_USER;
520                 prop = sym_get_choice_prop(cs);
521                 for (e = prop->expr; e; e = e->left.expr) {
522                         if (e->right.sym->visible != no)
523                                 e->right.sym->flags |= SYMBOL_DEF_USER;
524                 }
525         }
526
527         sym->def[S_DEF_USER].tri = val;
528         if (oldval != val)
529                 sym_clear_all_valid();
530
531         return true;
532 }
533
534 tristate sym_toggle_tristate_value(struct symbol *sym)
535 {
536         tristate oldval, newval;
537
538         oldval = newval = sym_get_tristate_value(sym);
539         do {
540                 switch (newval) {
541                 case no:
542                         newval = mod;
543                         break;
544                 case mod:
545                         newval = yes;
546                         break;
547                 case yes:
548                         newval = no;
549                         break;
550                 }
551                 if (sym_set_tristate_value(sym, newval))
552                         break;
553         } while (oldval != newval);
554         return newval;
555 }
556
557 bool sym_string_valid(struct symbol *sym, const char *str)
558 {
559         signed char ch;
560
561         switch (sym->type) {
562         case S_STRING:
563                 return true;
564         case S_INT:
565                 ch = *str++;
566                 if (ch == '-')
567                         ch = *str++;
568                 if (!isdigit(ch))
569                         return false;
570                 if (ch == '0' && *str != 0)
571                         return false;
572                 while ((ch = *str++)) {
573                         if (!isdigit(ch))
574                                 return false;
575                 }
576                 return true;
577         case S_HEX:
578                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
579                         str += 2;
580                 ch = *str++;
581                 do {
582                         if (!isxdigit(ch))
583                                 return false;
584                 } while ((ch = *str++));
585                 return true;
586         case S_BOOLEAN:
587         case S_TRISTATE:
588                 switch (str[0]) {
589                 case 'y': case 'Y':
590                 case 'm': case 'M':
591                 case 'n': case 'N':
592                         return true;
593                 }
594                 return false;
595         default:
596                 return false;
597         }
598 }
599
600 bool sym_string_within_range(struct symbol *sym, const char *str)
601 {
602         struct property *prop;
603         long long val;
604
605         switch (sym->type) {
606         case S_STRING:
607                 return sym_string_valid(sym, str);
608         case S_INT:
609                 if (!sym_string_valid(sym, str))
610                         return false;
611                 prop = sym_get_range_prop(sym);
612                 if (!prop)
613                         return true;
614                 val = strtoll(str, NULL, 10);
615                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
616                        val <= sym_get_range_val(prop->expr->right.sym, 10);
617         case S_HEX:
618                 if (!sym_string_valid(sym, str))
619                         return false;
620                 prop = sym_get_range_prop(sym);
621                 if (!prop)
622                         return true;
623                 val = strtoll(str, NULL, 16);
624                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
625                        val <= sym_get_range_val(prop->expr->right.sym, 16);
626         case S_BOOLEAN:
627         case S_TRISTATE:
628                 switch (str[0]) {
629                 case 'y': case 'Y':
630                         return sym_tristate_within_range(sym, yes);
631                 case 'm': case 'M':
632                         return sym_tristate_within_range(sym, mod);
633                 case 'n': case 'N':
634                         return sym_tristate_within_range(sym, no);
635                 }
636                 return false;
637         default:
638                 return false;
639         }
640 }
641
642 bool sym_set_string_value(struct symbol *sym, const char *newval)
643 {
644         const char *oldval;
645         char *val;
646         int size;
647
648         switch (sym->type) {
649         case S_BOOLEAN:
650         case S_TRISTATE:
651                 switch (newval[0]) {
652                 case 'y': case 'Y':
653                         return sym_set_tristate_value(sym, yes);
654                 case 'm': case 'M':
655                         return sym_set_tristate_value(sym, mod);
656                 case 'n': case 'N':
657                         return sym_set_tristate_value(sym, no);
658                 }
659                 return false;
660         default:
661                 ;
662         }
663
664         if (!sym_string_within_range(sym, newval))
665                 return false;
666
667         if (!(sym->flags & SYMBOL_DEF_USER)) {
668                 sym->flags |= SYMBOL_DEF_USER;
669                 sym_set_changed(sym);
670         }
671
672         oldval = sym->def[S_DEF_USER].val;
673         size = strlen(newval) + 1;
674         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
675                 size += 2;
676                 sym->def[S_DEF_USER].val = val = xmalloc(size);
677                 *val++ = '0';
678                 *val++ = 'x';
679         } else if (!oldval || strcmp(oldval, newval))
680                 sym->def[S_DEF_USER].val = val = xmalloc(size);
681         else
682                 return true;
683
684         strcpy(val, newval);
685         free((void *)oldval);
686         sym_clear_all_valid();
687
688         return true;
689 }
690
691 /*
692  * Find the default value associated to a symbol.
693  * For tristate symbol handle the modules=n case
694  * in which case "m" becomes "y".
695  * If the symbol does not have any default then fallback
696  * to the fixed default values.
697  */
698 const char *sym_get_string_default(struct symbol *sym)
699 {
700         struct property *prop;
701         struct symbol *ds;
702         const char *str;
703         tristate val;
704
705         sym_calc_visibility(sym);
706         sym_calc_value(modules_sym);
707         val = symbol_no.curr.tri;
708         str = symbol_empty.curr.val;
709
710         /* If symbol has a default value look it up */
711         prop = sym_get_default_prop(sym);
712         if (prop != NULL) {
713                 switch (sym->type) {
714                 case S_BOOLEAN:
715                 case S_TRISTATE:
716                         /* The visibility may limit the value from yes => mod */
717                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
718                         break;
719                 default:
720                         /*
721                          * The following fails to handle the situation
722                          * where a default value is further limited by
723                          * the valid range.
724                          */
725                         ds = prop_get_symbol(prop);
726                         if (ds != NULL) {
727                                 sym_calc_value(ds);
728                                 str = (const char *)ds->curr.val;
729                         }
730                 }
731         }
732
733         /* Handle select statements */
734         val = EXPR_OR(val, sym->rev_dep.tri);
735
736         /* transpose mod to yes if modules are not enabled */
737         if (val == mod)
738                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
739                         val = yes;
740
741         /* transpose mod to yes if type is bool */
742         if (sym->type == S_BOOLEAN && val == mod)
743                 val = yes;
744
745         switch (sym->type) {
746         case S_BOOLEAN:
747         case S_TRISTATE:
748                 switch (val) {
749                 case no: return "n";
750                 case mod: return "m";
751                 case yes: return "y";
752                 }
753         case S_INT:
754         case S_HEX:
755                 return str;
756         case S_STRING:
757                 return str;
758         case S_OTHER:
759         case S_UNKNOWN:
760                 break;
761         }
762         return "";
763 }
764
765 const char *sym_get_string_value(struct symbol *sym)
766 {
767         tristate val;
768
769         switch (sym->type) {
770         case S_BOOLEAN:
771         case S_TRISTATE:
772                 val = sym_get_tristate_value(sym);
773                 switch (val) {
774                 case no:
775                         return "n";
776                 case mod:
777                         sym_calc_value(modules_sym);
778                         return (modules_sym->curr.tri == no) ? "n" : "m";
779                 case yes:
780                         return "y";
781                 }
782                 break;
783         default:
784                 ;
785         }
786         return (const char *)sym->curr.val;
787 }
788
789 bool sym_is_changable(struct symbol *sym)
790 {
791         return sym->visible > sym->rev_dep.tri;
792 }
793
794 static unsigned strhash(const char *s)
795 {
796         /* fnv32 hash */
797         unsigned hash = 2166136261U;
798         for (; *s; s++)
799                 hash = (hash ^ *s) * 0x01000193;
800         return hash;
801 }
802
803 struct symbol *sym_lookup(const char *name, int flags)
804 {
805         struct symbol *symbol;
806         char *new_name;
807         int hash;
808
809         if (name) {
810                 if (name[0] && !name[1]) {
811                         switch (name[0]) {
812                         case 'y': return &symbol_yes;
813                         case 'm': return &symbol_mod;
814                         case 'n': return &symbol_no;
815                         }
816                 }
817                 hash = strhash(name) % SYMBOL_HASHSIZE;
818
819                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
820                         if (symbol->name &&
821                             !strcmp(symbol->name, name) &&
822                             (flags ? symbol->flags & flags
823                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
824                                 return symbol;
825                 }
826                 new_name = strdup(name);
827         } else {
828                 new_name = NULL;
829                 hash = 0;
830         }
831
832         symbol = xmalloc(sizeof(*symbol));
833         memset(symbol, 0, sizeof(*symbol));
834         symbol->name = new_name;
835         symbol->type = S_UNKNOWN;
836         symbol->flags |= flags;
837
838         symbol->next = symbol_hash[hash];
839         symbol_hash[hash] = symbol;
840
841         return symbol;
842 }
843
844 struct symbol *sym_find(const char *name)
845 {
846         struct symbol *symbol = NULL;
847         int hash = 0;
848
849         if (!name)
850                 return NULL;
851
852         if (name[0] && !name[1]) {
853                 switch (name[0]) {
854                 case 'y': return &symbol_yes;
855                 case 'm': return &symbol_mod;
856                 case 'n': return &symbol_no;
857                 }
858         }
859         hash = strhash(name) % SYMBOL_HASHSIZE;
860
861         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
862                 if (symbol->name &&
863                     !strcmp(symbol->name, name) &&
864                     !(symbol->flags & SYMBOL_CONST))
865                                 break;
866         }
867
868         return symbol;
869 }
870
871 /*
872  * Expand symbol's names embedded in the string given in argument. Symbols'
873  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
874  * the empty string.
875  */
876 const char *sym_expand_string_value(const char *in)
877 {
878         const char *src;
879         char *res;
880         size_t reslen;
881
882         reslen = strlen(in) + 1;
883         res = xmalloc(reslen);
884         res[0] = '\0';
885
886         while ((src = strchr(in, '$'))) {
887                 char *p, name[SYMBOL_MAXLENGTH];
888                 const char *symval = "";
889                 struct symbol *sym;
890                 size_t newlen;
891
892                 strncat(res, in, src - in);
893                 src++;
894
895                 p = name;
896                 while (isalnum(*src) || *src == '_')
897                         *p++ = *src++;
898                 *p = '\0';
899
900                 sym = sym_find(name);
901                 if (sym != NULL) {
902                         sym_calc_value(sym);
903                         symval = sym_get_string_value(sym);
904                 }
905
906                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
907                 if (newlen > reslen) {
908                         reslen = newlen;
909                         res = realloc(res, reslen);
910                 }
911
912                 strcat(res, symval);
913                 in = src;
914         }
915         strcat(res, in);
916
917         return res;
918 }
919
920 const char *sym_escape_string_value(const char *in)
921 {
922         const char *p;
923         size_t reslen;
924         char *res;
925         size_t l;
926
927         reslen = strlen(in) + strlen("\"\"") + 1;
928
929         p = in;
930         for (;;) {
931                 l = strcspn(p, "\"\\");
932                 p += l;
933
934                 if (p[0] == '\0')
935                         break;
936
937                 reslen++;
938                 p++;
939         }
940
941         res = xmalloc(reslen);
942         res[0] = '\0';
943
944         strcat(res, "\"");
945
946         p = in;
947         for (;;) {
948                 l = strcspn(p, "\"\\");
949                 strncat(res, p, l);
950                 p += l;
951
952                 if (p[0] == '\0')
953                         break;
954
955                 strcat(res, "\\");
956                 strncat(res, p++, 1);
957         }
958
959         strcat(res, "\"");
960         return res;
961 }
962
963 struct sym_match {
964         struct symbol   *sym;
965         off_t           so, eo;
966 };
967
968 /* Compare matched symbols as thus:
969  * - first, symbols that match exactly
970  * - then, alphabetical sort
971  */
972 static int sym_rel_comp(const void *sym1, const void *sym2)
973 {
974         const struct sym_match *s1 = sym1;
975         const struct sym_match *s2 = sym2;
976         int exact1, exact2;
977
978         /* Exact match:
979          * - if matched length on symbol s1 is the length of that symbol,
980          *   then this symbol should come first;
981          * - if matched length on symbol s2 is the length of that symbol,
982          *   then this symbol should come first.
983          * Note: since the search can be a regexp, both symbols may match
984          * exactly; if this is the case, we can't decide which comes first,
985          * and we fallback to sorting alphabetically.
986          */
987         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
988         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
989         if (exact1 && !exact2)
990                 return -1;
991         if (!exact1 && exact2)
992                 return 1;
993
994         /* As a fallback, sort symbols alphabetically */
995         return strcmp(s1->sym->name, s2->sym->name);
996 }
997
998 struct symbol **sym_re_search(const char *pattern)
999 {
1000         struct symbol *sym, **sym_arr = NULL;
1001         struct sym_match *sym_match_arr = NULL;
1002         int i, cnt, size;
1003         regex_t re;
1004         regmatch_t match[1];
1005
1006         cnt = size = 0;
1007         /* Skip if empty */
1008         if (strlen(pattern) == 0)
1009                 return NULL;
1010         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
1011                 return NULL;
1012
1013         for_all_symbols(i, sym) {
1014                 if (sym->flags & SYMBOL_CONST || !sym->name)
1015                         continue;
1016                 if (regexec(&re, sym->name, 1, match, 0))
1017                         continue;
1018                 if (cnt >= size) {
1019                         void *tmp;
1020                         size += 16;
1021                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
1022                         if (!tmp)
1023                                 goto sym_re_search_free;
1024                         sym_match_arr = tmp;
1025                 }
1026                 sym_calc_value(sym);
1027                 /* As regexec returned 0, we know we have a match, so
1028                  * we can use match[0].rm_[se]o without further checks
1029                  */
1030                 sym_match_arr[cnt].so = match[0].rm_so;
1031                 sym_match_arr[cnt].eo = match[0].rm_eo;
1032                 sym_match_arr[cnt++].sym = sym;
1033         }
1034         if (sym_match_arr) {
1035                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
1036                 sym_arr = malloc((cnt+1) * sizeof(struct symbol));
1037                 if (!sym_arr)
1038                         goto sym_re_search_free;
1039                 for (i = 0; i < cnt; i++)
1040                         sym_arr[i] = sym_match_arr[i].sym;
1041                 sym_arr[cnt] = NULL;
1042         }
1043 sym_re_search_free:
1044         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
1045         free(sym_match_arr);
1046         regfree(&re);
1047
1048         return sym_arr;
1049 }
1050
1051 /*
1052  * When we check for recursive dependencies we use a stack to save
1053  * current state so we can print out relevant info to user.
1054  * The entries are located on the call stack so no need to free memory.
1055  * Note insert() remove() must always match to properly clear the stack.
1056  */
1057 static struct dep_stack {
1058         struct dep_stack *prev, *next;
1059         struct symbol *sym;
1060         struct property *prop;
1061         struct expr *expr;
1062 } *check_top;
1063
1064 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1065 {
1066         memset(stack, 0, sizeof(*stack));
1067         if (check_top)
1068                 check_top->next = stack;
1069         stack->prev = check_top;
1070         stack->sym = sym;
1071         check_top = stack;
1072 }
1073
1074 static void dep_stack_remove(void)
1075 {
1076         check_top = check_top->prev;
1077         if (check_top)
1078                 check_top->next = NULL;
1079 }
1080
1081 /*
1082  * Called when we have detected a recursive dependency.
1083  * check_top point to the top of the stact so we use
1084  * the ->prev pointer to locate the bottom of the stack.
1085  */
1086 static void sym_check_print_recursive(struct symbol *last_sym)
1087 {
1088         struct dep_stack *stack;
1089         struct symbol *sym, *next_sym;
1090         struct menu *menu = NULL;
1091         struct property *prop;
1092         struct dep_stack cv_stack;
1093
1094         if (sym_is_choice_value(last_sym)) {
1095                 dep_stack_insert(&cv_stack, last_sym);
1096                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1097         }
1098
1099         for (stack = check_top; stack != NULL; stack = stack->prev)
1100                 if (stack->sym == last_sym)
1101                         break;
1102         if (!stack) {
1103                 fprintf(stderr, "unexpected recursive dependency error\n");
1104                 return;
1105         }
1106
1107         for (; stack; stack = stack->next) {
1108                 sym = stack->sym;
1109                 next_sym = stack->next ? stack->next->sym : last_sym;
1110                 prop = stack->prop;
1111                 if (prop == NULL)
1112                         prop = stack->sym->prop;
1113
1114                 /* for choice values find the menu entry (used below) */
1115                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1116                         for (prop = sym->prop; prop; prop = prop->next) {
1117                                 menu = prop->menu;
1118                                 if (prop->menu)
1119                                         break;
1120                         }
1121                 }
1122                 if (stack->sym == last_sym)
1123                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1124                                 prop->file->name, prop->lineno);
1125                         fprintf(stderr, "For a resolution refer to Documentation/kbuild/kconfig-language.txt\n");
1126                         fprintf(stderr, "subsection \"Kconfig recursive dependency limitations\"\n");
1127                 if (stack->expr) {
1128                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1129                                 prop->file->name, prop->lineno,
1130                                 sym->name ? sym->name : "<choice>",
1131                                 prop_get_type_name(prop->type),
1132                                 next_sym->name ? next_sym->name : "<choice>");
1133                 } else if (stack->prop) {
1134                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1135                                 prop->file->name, prop->lineno,
1136                                 sym->name ? sym->name : "<choice>",
1137                                 next_sym->name ? next_sym->name : "<choice>");
1138                 } else if (sym_is_choice(sym)) {
1139                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1140                                 menu->file->name, menu->lineno,
1141                                 sym->name ? sym->name : "<choice>",
1142                                 next_sym->name ? next_sym->name : "<choice>");
1143                 } else if (sym_is_choice_value(sym)) {
1144                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1145                                 menu->file->name, menu->lineno,
1146                                 sym->name ? sym->name : "<choice>",
1147                                 next_sym->name ? next_sym->name : "<choice>");
1148                 } else {
1149                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1150                                 prop->file->name, prop->lineno,
1151                                 sym->name ? sym->name : "<choice>",
1152                                 next_sym->name ? next_sym->name : "<choice>");
1153                 }
1154         }
1155
1156         if (check_top == &cv_stack)
1157                 dep_stack_remove();
1158 }
1159
1160 static struct symbol *sym_check_expr_deps(struct expr *e)
1161 {
1162         struct symbol *sym;
1163
1164         if (!e)
1165                 return NULL;
1166         switch (e->type) {
1167         case E_OR:
1168         case E_AND:
1169                 sym = sym_check_expr_deps(e->left.expr);
1170                 if (sym)
1171                         return sym;
1172                 return sym_check_expr_deps(e->right.expr);
1173         case E_NOT:
1174                 return sym_check_expr_deps(e->left.expr);
1175         case E_EQUAL:
1176         case E_GEQ:
1177         case E_GTH:
1178         case E_LEQ:
1179         case E_LTH:
1180         case E_UNEQUAL:
1181                 sym = sym_check_deps(e->left.sym);
1182                 if (sym)
1183                         return sym;
1184                 return sym_check_deps(e->right.sym);
1185         case E_SYMBOL:
1186                 return sym_check_deps(e->left.sym);
1187         default:
1188                 break;
1189         }
1190         printf("Oops! How to check %d?\n", e->type);
1191         return NULL;
1192 }
1193
1194 /* return NULL when dependencies are OK */
1195 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1196 {
1197         struct symbol *sym2;
1198         struct property *prop;
1199         struct dep_stack stack;
1200
1201         dep_stack_insert(&stack, sym);
1202
1203         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1204         if (sym2)
1205                 goto out;
1206
1207         for (prop = sym->prop; prop; prop = prop->next) {
1208                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1209                         continue;
1210                 stack.prop = prop;
1211                 sym2 = sym_check_expr_deps(prop->visible.expr);
1212                 if (sym2)
1213                         break;
1214                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1215                         continue;
1216                 stack.expr = prop->expr;
1217                 sym2 = sym_check_expr_deps(prop->expr);
1218                 if (sym2)
1219                         break;
1220                 stack.expr = NULL;
1221         }
1222
1223 out:
1224         dep_stack_remove();
1225
1226         return sym2;
1227 }
1228
1229 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1230 {
1231         struct symbol *sym, *sym2;
1232         struct property *prop;
1233         struct expr *e;
1234         struct dep_stack stack;
1235
1236         dep_stack_insert(&stack, choice);
1237
1238         prop = sym_get_choice_prop(choice);
1239         expr_list_for_each_sym(prop->expr, e, sym)
1240                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1241
1242         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1243         sym2 = sym_check_sym_deps(choice);
1244         choice->flags &= ~SYMBOL_CHECK;
1245         if (sym2)
1246                 goto out;
1247
1248         expr_list_for_each_sym(prop->expr, e, sym) {
1249                 sym2 = sym_check_sym_deps(sym);
1250                 if (sym2)
1251                         break;
1252         }
1253 out:
1254         expr_list_for_each_sym(prop->expr, e, sym)
1255                 sym->flags &= ~SYMBOL_CHECK;
1256
1257         if (sym2 && sym_is_choice_value(sym2) &&
1258             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1259                 sym2 = choice;
1260
1261         dep_stack_remove();
1262
1263         return sym2;
1264 }
1265
1266 struct symbol *sym_check_deps(struct symbol *sym)
1267 {
1268         struct symbol *sym2;
1269         struct property *prop;
1270
1271         if (sym->flags & SYMBOL_CHECK) {
1272                 sym_check_print_recursive(sym);
1273                 return sym;
1274         }
1275         if (sym->flags & SYMBOL_CHECKED)
1276                 return NULL;
1277
1278         if (sym_is_choice_value(sym)) {
1279                 struct dep_stack stack;
1280
1281                 /* for choice groups start the check with main choice symbol */
1282                 dep_stack_insert(&stack, sym);
1283                 prop = sym_get_choice_prop(sym);
1284                 sym2 = sym_check_deps(prop_get_symbol(prop));
1285                 dep_stack_remove();
1286         } else if (sym_is_choice(sym)) {
1287                 sym2 = sym_check_choice_deps(sym);
1288         } else {
1289                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1290                 sym2 = sym_check_sym_deps(sym);
1291                 sym->flags &= ~SYMBOL_CHECK;
1292         }
1293
1294         if (sym2 && sym2 == sym)
1295                 sym2 = NULL;
1296
1297         return sym2;
1298 }
1299
1300 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1301 {
1302         struct property *prop;
1303         struct property **propp;
1304
1305         prop = xmalloc(sizeof(*prop));
1306         memset(prop, 0, sizeof(*prop));
1307         prop->type = type;
1308         prop->sym = sym;
1309         prop->file = current_file;
1310         prop->lineno = zconf_lineno();
1311
1312         /* append property to the prop list of symbol */
1313         if (sym) {
1314                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1315                         ;
1316                 *propp = prop;
1317         }
1318
1319         return prop;
1320 }
1321
1322 struct symbol *prop_get_symbol(struct property *prop)
1323 {
1324         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1325                            prop->expr->type == E_LIST))
1326                 return prop->expr->left.sym;
1327         return NULL;
1328 }
1329
1330 const char *prop_get_type_name(enum prop_type type)
1331 {
1332         switch (type) {
1333         case P_PROMPT:
1334                 return "prompt";
1335         case P_ENV:
1336                 return "env";
1337         case P_COMMENT:
1338                 return "comment";
1339         case P_MENU:
1340                 return "menu";
1341         case P_DEFAULT:
1342                 return "default";
1343         case P_CHOICE:
1344                 return "choice";
1345         case P_SELECT:
1346                 return "select";
1347         case P_RANGE:
1348                 return "range";
1349         case P_SYMBOL:
1350                 return "symbol";
1351         case P_RESET:
1352                 return "reset";
1353         case P_UNKNOWN:
1354                 break;
1355         }
1356         return "unknown";
1357 }
1358
1359 static void prop_add_env(const char *env)
1360 {
1361         struct symbol *sym, *sym2;
1362         struct property *prop;
1363         char *p;
1364
1365         sym = current_entry->sym;
1366         sym->flags |= SYMBOL_AUTO;
1367         for_all_properties(sym, prop, P_ENV) {
1368                 sym2 = prop_get_symbol(prop);
1369                 if (strcmp(sym2->name, env))
1370                         menu_warn(current_entry, "redefining environment symbol from %s",
1371                                   sym2->name);
1372                 return;
1373         }
1374
1375         prop = prop_alloc(P_ENV, sym);
1376         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1377
1378         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1379         sym_env_list->right.sym = sym;
1380
1381         p = getenv(env);
1382         if (p)
1383                 sym_add_default(sym, p);
1384         else
1385                 menu_warn(current_entry, "environment variable %s undefined", env);
1386 }