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
sym_add_default(struct symbol * sym,const char * def)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
sym_init(void)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
sym_get_type(struct symbol * sym)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
sym_type_name(enum symbol_type type)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
sym_get_choice_prop(struct symbol * sym)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
sym_get_env_prop(struct symbol * sym)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
sym_get_default_prop(struct symbol * sym)115 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
sym_get_range_prop(struct symbol * sym)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
sym_get_range_val(struct symbol * sym,int base)139 static int 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 strtol(sym->curr.val, NULL, base);
153 }
154
sym_validate_range(struct symbol * sym)155 static void sym_validate_range(struct symbol *sym)
156 {
157 struct property *prop;
158 int base, val, val2;
159 char str[64];
160
161 switch (sym->type) {
162 case S_INT:
163 base = 10;
164 break;
165 case S_HEX:
166 base = 16;
167 break;
168 default:
169 return;
170 }
171 prop = sym_get_range_prop(sym);
172 if (!prop)
173 return;
174 val = strtol(sym->curr.val, NULL, base);
175 val2 = sym_get_range_val(prop->expr->left.sym, base);
176 if (val >= val2) {
177 val2 = sym_get_range_val(prop->expr->right.sym, base);
178 if (val <= val2)
179 return;
180 }
181 if (sym->type == S_INT)
182 sprintf(str, "%d", val2);
183 else
184 sprintf(str, "0x%x", val2);
185 sym->curr.val = strdup(str);
186 }
187
sym_calc_visibility(struct symbol * sym)188 static void sym_calc_visibility(struct symbol *sym)
189 {
190 struct property *prop;
191 tristate tri;
192
193 /* any prompt visible? */
194 tri = no;
195 for_all_prompts(sym, prop) {
196 prop->visible.tri = expr_calc_value(prop->visible.expr);
197 tri = EXPR_OR(tri, prop->visible.tri);
198 }
199 if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
200 tri = yes;
201 if (sym->visible != tri) {
202 sym->visible = tri;
203 sym_set_changed(sym);
204 }
205 if (sym_is_choice_value(sym))
206 return;
207 /* defaulting to "yes" if no explicit "depends on" are given */
208 tri = yes;
209 if (sym->dir_dep.expr)
210 tri = expr_calc_value(sym->dir_dep.expr);
211 if (tri == mod)
212 tri = yes;
213 if (sym->dir_dep.tri != tri) {
214 sym->dir_dep.tri = tri;
215 sym_set_changed(sym);
216 }
217 tri = no;
218 if (sym->rev_dep.expr)
219 tri = expr_calc_value(sym->rev_dep.expr);
220 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
221 tri = yes;
222 if (sym->rev_dep.tri != tri) {
223 sym->rev_dep.tri = tri;
224 sym_set_changed(sym);
225 }
226 }
227
228 /*
229 * Find the default symbol for a choice.
230 * First try the default values for the choice symbol
231 * Next locate the first visible choice value
232 * Return NULL if none was found
233 */
sym_choice_default(struct symbol * sym)234 struct symbol *sym_choice_default(struct symbol *sym)
235 {
236 struct symbol *def_sym;
237 struct property *prop;
238 struct expr *e;
239
240 /* any of the defaults visible? */
241 for_all_defaults(sym, prop) {
242 prop->visible.tri = expr_calc_value(prop->visible.expr);
243 if (prop->visible.tri == no)
244 continue;
245 def_sym = prop_get_symbol(prop);
246 if (def_sym->visible != no)
247 return def_sym;
248 }
249
250 /* just get the first visible value */
251 prop = sym_get_choice_prop(sym);
252 expr_list_for_each_sym(prop->expr, e, def_sym)
253 if (def_sym->visible != no)
254 return def_sym;
255
256 /* failed to locate any defaults */
257 return NULL;
258 }
259
sym_calc_choice(struct symbol * sym)260 static struct symbol *sym_calc_choice(struct symbol *sym)
261 {
262 struct symbol *def_sym;
263 struct property *prop;
264 struct expr *e;
265 int flags;
266
267 /* first calculate all choice values' visibilities */
268 flags = sym->flags;
269 prop = sym_get_choice_prop(sym);
270 expr_list_for_each_sym(prop->expr, e, def_sym) {
271 sym_calc_visibility(def_sym);
272 if (def_sym->visible != no)
273 flags &= def_sym->flags;
274 }
275
276 sym->flags &= flags | ~SYMBOL_DEF_USER;
277
278 /* is the user choice visible? */
279 def_sym = sym->def[S_DEF_USER].val;
280 if (def_sym && def_sym->visible != no)
281 return def_sym;
282
283 def_sym = sym_choice_default(sym);
284
285 if (def_sym == NULL)
286 /* no choice? reset tristate value */
287 sym->curr.tri = no;
288
289 return def_sym;
290 }
291
sym_calc_value(struct symbol * sym)292 void sym_calc_value(struct symbol *sym)
293 {
294 struct symbol_value newval, oldval;
295 struct property *prop;
296 struct expr *e;
297
298 if (!sym)
299 return;
300
301 if (sym->flags & SYMBOL_VALID)
302 return;
303
304 if (sym_is_choice_value(sym) &&
305 sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
306 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
307 prop = sym_get_choice_prop(sym);
308 sym_calc_value(prop_get_symbol(prop));
309 }
310
311 sym->flags |= SYMBOL_VALID;
312
313 oldval = sym->curr;
314
315 switch (sym->type) {
316 case S_INT:
317 case S_HEX:
318 case S_STRING:
319 newval = symbol_empty.curr;
320 break;
321 case S_BOOLEAN:
322 case S_TRISTATE:
323 newval = symbol_no.curr;
324 break;
325 default:
326 sym->curr.val = sym->name;
327 sym->curr.tri = no;
328 return;
329 }
330 if (!sym_is_choice_value(sym))
331 sym->flags &= ~SYMBOL_WRITE;
332
333 sym_calc_visibility(sym);
334
335 /* set default if recursively called */
336 sym->curr = newval;
337
338 switch (sym_get_type(sym)) {
339 case S_BOOLEAN:
340 case S_TRISTATE:
341 if (sym_is_choice_value(sym) && sym->visible == yes) {
342 prop = sym_get_choice_prop(sym);
343 newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
344 } else {
345 if (sym->visible != no) {
346 /* if the symbol is visible use the user value
347 * if available, otherwise try the default value
348 */
349 sym->flags |= SYMBOL_WRITE;
350 if (sym_has_value(sym)) {
351 newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
352 sym->visible);
353 goto calc_newval;
354 }
355 }
356 if (sym->rev_dep.tri != no)
357 sym->flags |= SYMBOL_WRITE;
358 if (!sym_is_choice(sym)) {
359 prop = sym_get_default_prop(sym);
360 if (prop) {
361 sym->flags |= SYMBOL_WRITE;
362 newval.tri = EXPR_AND(expr_calc_value(prop->expr),
363 prop->visible.tri);
364 }
365 }
366 calc_newval:
367 if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
368 struct expr *e;
369 e = expr_simplify_unmet_dep(sym->rev_dep.expr,
370 sym->dir_dep.expr);
371 fprintf(stderr, "warning: (");
372 expr_fprint(e, stderr);
373 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
374 sym->name);
375 expr_fprint(sym->dir_dep.expr, stderr);
376 fprintf(stderr, ")\n");
377 expr_free(e);
378 }
379 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
380 }
381 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
382 newval.tri = yes;
383 break;
384 case S_STRING:
385 case S_HEX:
386 case S_INT:
387 if (sym->visible != no) {
388 sym->flags |= SYMBOL_WRITE;
389 if (sym_has_value(sym)) {
390 newval.val = sym->def[S_DEF_USER].val;
391 break;
392 }
393 }
394 prop = sym_get_default_prop(sym);
395 if (prop) {
396 struct symbol *ds = prop_get_symbol(prop);
397 if (ds) {
398 sym->flags |= SYMBOL_WRITE;
399 sym_calc_value(ds);
400 newval.val = ds->curr.val;
401 }
402 }
403 break;
404 default:
405 ;
406 }
407
408 sym->curr = newval;
409 if (sym_is_choice(sym) && newval.tri == yes)
410 sym->curr.val = sym_calc_choice(sym);
411 sym_validate_range(sym);
412
413 if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
414 sym_set_changed(sym);
415 if (modules_sym == sym) {
416 sym_set_all_changed();
417 modules_val = modules_sym->curr.tri;
418 }
419 }
420
421 if (sym_is_choice(sym)) {
422 struct symbol *choice_sym;
423
424 prop = sym_get_choice_prop(sym);
425 expr_list_for_each_sym(prop->expr, e, choice_sym) {
426 if ((sym->flags & SYMBOL_WRITE) &&
427 choice_sym->visible != no)
428 choice_sym->flags |= SYMBOL_WRITE;
429 if (sym->flags & SYMBOL_CHANGED)
430 sym_set_changed(choice_sym);
431 }
432 }
433
434 if (sym->flags & SYMBOL_AUTO)
435 sym->flags &= ~SYMBOL_WRITE;
436
437 if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
438 set_all_choice_values(sym);
439 }
440
sym_clear_all_valid(void)441 void sym_clear_all_valid(void)
442 {
443 struct symbol *sym;
444 int i;
445
446 for_all_symbols(i, sym)
447 sym->flags &= ~SYMBOL_VALID;
448 sym_add_change_count(1);
449 if (modules_sym)
450 sym_calc_value(modules_sym);
451 }
452
sym_set_changed(struct symbol * sym)453 void sym_set_changed(struct symbol *sym)
454 {
455 struct property *prop;
456
457 sym->flags |= SYMBOL_CHANGED;
458 for (prop = sym->prop; prop; prop = prop->next) {
459 if (prop->menu)
460 prop->menu->flags |= MENU_CHANGED;
461 }
462 }
463
sym_set_all_changed(void)464 void sym_set_all_changed(void)
465 {
466 struct symbol *sym;
467 int i;
468
469 for_all_symbols(i, sym)
470 sym_set_changed(sym);
471 }
472
sym_tristate_within_range(struct symbol * sym,tristate val)473 bool sym_tristate_within_range(struct symbol *sym, tristate val)
474 {
475 int type = sym_get_type(sym);
476
477 if (sym->visible == no)
478 return false;
479
480 if (type != S_BOOLEAN && type != S_TRISTATE)
481 return false;
482
483 if (type == S_BOOLEAN && val == mod)
484 return false;
485 if (sym->visible <= sym->rev_dep.tri)
486 return false;
487 if (sym_is_choice_value(sym) && sym->visible == yes)
488 return val == yes;
489 return val >= sym->rev_dep.tri && val <= sym->visible;
490 }
491
sym_set_tristate_value(struct symbol * sym,tristate val)492 bool sym_set_tristate_value(struct symbol *sym, tristate val)
493 {
494 tristate oldval = sym_get_tristate_value(sym);
495
496 if (oldval != val && !sym_tristate_within_range(sym, val))
497 return false;
498
499 if (!(sym->flags & SYMBOL_DEF_USER)) {
500 sym->flags |= SYMBOL_DEF_USER;
501 sym_set_changed(sym);
502 }
503 /*
504 * setting a choice value also resets the new flag of the choice
505 * symbol and all other choice values.
506 */
507 if (sym_is_choice_value(sym) && val == yes) {
508 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
509 struct property *prop;
510 struct expr *e;
511
512 cs->def[S_DEF_USER].val = sym;
513 cs->flags |= SYMBOL_DEF_USER;
514 prop = sym_get_choice_prop(cs);
515 for (e = prop->expr; e; e = e->left.expr) {
516 if (e->right.sym->visible != no)
517 e->right.sym->flags |= SYMBOL_DEF_USER;
518 }
519 }
520
521 sym->def[S_DEF_USER].tri = val;
522 if (oldval != val)
523 sym_clear_all_valid();
524
525 return true;
526 }
527
sym_toggle_tristate_value(struct symbol * sym)528 tristate sym_toggle_tristate_value(struct symbol *sym)
529 {
530 tristate oldval, newval;
531
532 oldval = newval = sym_get_tristate_value(sym);
533 do {
534 switch (newval) {
535 case no:
536 newval = mod;
537 break;
538 case mod:
539 newval = yes;
540 break;
541 case yes:
542 newval = no;
543 break;
544 }
545 if (sym_set_tristate_value(sym, newval))
546 break;
547 } while (oldval != newval);
548 return newval;
549 }
550
sym_string_valid(struct symbol * sym,const char * str)551 bool sym_string_valid(struct symbol *sym, const char *str)
552 {
553 signed char ch;
554
555 switch (sym->type) {
556 case S_STRING:
557 return true;
558 case S_INT:
559 ch = *str++;
560 if (ch == '-')
561 ch = *str++;
562 if (!isdigit(ch))
563 return false;
564 if (ch == '0' && *str != 0)
565 return false;
566 while ((ch = *str++)) {
567 if (!isdigit(ch))
568 return false;
569 }
570 return true;
571 case S_HEX:
572 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
573 str += 2;
574 ch = *str++;
575 do {
576 if (!isxdigit(ch))
577 return false;
578 } while ((ch = *str++));
579 return true;
580 case S_BOOLEAN:
581 case S_TRISTATE:
582 switch (str[0]) {
583 case 'y': case 'Y':
584 case 'm': case 'M':
585 case 'n': case 'N':
586 return true;
587 }
588 return false;
589 default:
590 return false;
591 }
592 }
593
sym_string_within_range(struct symbol * sym,const char * str)594 bool sym_string_within_range(struct symbol *sym, const char *str)
595 {
596 struct property *prop;
597 int val;
598
599 switch (sym->type) {
600 case S_STRING:
601 return sym_string_valid(sym, str);
602 case S_INT:
603 if (!sym_string_valid(sym, str))
604 return false;
605 prop = sym_get_range_prop(sym);
606 if (!prop)
607 return true;
608 val = strtol(str, NULL, 10);
609 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
610 val <= sym_get_range_val(prop->expr->right.sym, 10);
611 case S_HEX:
612 if (!sym_string_valid(sym, str))
613 return false;
614 prop = sym_get_range_prop(sym);
615 if (!prop)
616 return true;
617 val = strtol(str, NULL, 16);
618 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
619 val <= sym_get_range_val(prop->expr->right.sym, 16);
620 case S_BOOLEAN:
621 case S_TRISTATE:
622 switch (str[0]) {
623 case 'y': case 'Y':
624 return sym_tristate_within_range(sym, yes);
625 case 'm': case 'M':
626 return sym_tristate_within_range(sym, mod);
627 case 'n': case 'N':
628 return sym_tristate_within_range(sym, no);
629 }
630 return false;
631 default:
632 return false;
633 }
634 }
635
sym_set_string_value(struct symbol * sym,const char * newval)636 bool sym_set_string_value(struct symbol *sym, const char *newval)
637 {
638 const char *oldval;
639 char *val;
640 int size;
641
642 switch (sym->type) {
643 case S_BOOLEAN:
644 case S_TRISTATE:
645 switch (newval[0]) {
646 case 'y': case 'Y':
647 return sym_set_tristate_value(sym, yes);
648 case 'm': case 'M':
649 return sym_set_tristate_value(sym, mod);
650 case 'n': case 'N':
651 return sym_set_tristate_value(sym, no);
652 }
653 return false;
654 default:
655 ;
656 }
657
658 if (!sym_string_within_range(sym, newval))
659 return false;
660
661 if (!(sym->flags & SYMBOL_DEF_USER)) {
662 sym->flags |= SYMBOL_DEF_USER;
663 sym_set_changed(sym);
664 }
665
666 oldval = sym->def[S_DEF_USER].val;
667 size = strlen(newval) + 1;
668 if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
669 size += 2;
670 sym->def[S_DEF_USER].val = val = xmalloc(size);
671 *val++ = '0';
672 *val++ = 'x';
673 } else if (!oldval || strcmp(oldval, newval))
674 sym->def[S_DEF_USER].val = val = xmalloc(size);
675 else
676 return true;
677
678 strcpy(val, newval);
679 free((void *)oldval);
680 sym_clear_all_valid();
681
682 return true;
683 }
684
685 /*
686 * Find the default value associated to a symbol.
687 * For tristate symbol handle the modules=n case
688 * in which case "m" becomes "y".
689 * If the symbol does not have any default then fallback
690 * to the fixed default values.
691 */
sym_get_string_default(struct symbol * sym)692 const char *sym_get_string_default(struct symbol *sym)
693 {
694 struct property *prop;
695 struct symbol *ds;
696 const char *str;
697 tristate val;
698
699 sym_calc_visibility(sym);
700 sym_calc_value(modules_sym);
701 val = symbol_no.curr.tri;
702 str = symbol_empty.curr.val;
703
704 /* If symbol has a default value look it up */
705 prop = sym_get_default_prop(sym);
706 if (prop != NULL) {
707 switch (sym->type) {
708 case S_BOOLEAN:
709 case S_TRISTATE:
710 /* The visibility may limit the value from yes => mod */
711 val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
712 break;
713 default:
714 /*
715 * The following fails to handle the situation
716 * where a default value is further limited by
717 * the valid range.
718 */
719 ds = prop_get_symbol(prop);
720 if (ds != NULL) {
721 sym_calc_value(ds);
722 str = (const char *)ds->curr.val;
723 }
724 }
725 }
726
727 /* Handle select statements */
728 val = EXPR_OR(val, sym->rev_dep.tri);
729
730 /* transpose mod to yes if modules are not enabled */
731 if (val == mod)
732 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
733 val = yes;
734
735 /* transpose mod to yes if type is bool */
736 if (sym->type == S_BOOLEAN && val == mod)
737 val = yes;
738
739 switch (sym->type) {
740 case S_BOOLEAN:
741 case S_TRISTATE:
742 switch (val) {
743 case no: return "n";
744 case mod: return "m";
745 case yes: return "y";
746 }
747 case S_INT:
748 case S_HEX:
749 return str;
750 case S_STRING:
751 return str;
752 case S_OTHER:
753 case S_UNKNOWN:
754 break;
755 }
756 return "";
757 }
758
sym_get_string_value(struct symbol * sym)759 const char *sym_get_string_value(struct symbol *sym)
760 {
761 tristate val;
762
763 switch (sym->type) {
764 case S_BOOLEAN:
765 case S_TRISTATE:
766 val = sym_get_tristate_value(sym);
767 switch (val) {
768 case no:
769 return "n";
770 case mod:
771 sym_calc_value(modules_sym);
772 return (modules_sym->curr.tri == no) ? "n" : "m";
773 case yes:
774 return "y";
775 }
776 break;
777 default:
778 ;
779 }
780 return (const char *)sym->curr.val;
781 }
782
sym_is_changable(struct symbol * sym)783 bool sym_is_changable(struct symbol *sym)
784 {
785 return sym->visible > sym->rev_dep.tri;
786 }
787
strhash(const char * s)788 static unsigned strhash(const char *s)
789 {
790 /* fnv32 hash */
791 unsigned hash = 2166136261U;
792 for (; *s; s++)
793 hash = (hash ^ *s) * 0x01000193;
794 return hash;
795 }
796
sym_lookup(const char * name,int flags)797 struct symbol *sym_lookup(const char *name, int flags)
798 {
799 struct symbol *symbol;
800 char *new_name;
801 int hash;
802
803 if (name) {
804 if (name[0] && !name[1]) {
805 switch (name[0]) {
806 case 'y': return &symbol_yes;
807 case 'm': return &symbol_mod;
808 case 'n': return &symbol_no;
809 }
810 }
811 hash = strhash(name) % SYMBOL_HASHSIZE;
812
813 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
814 if (symbol->name &&
815 !strcmp(symbol->name, name) &&
816 (flags ? symbol->flags & flags
817 : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
818 return symbol;
819 }
820 new_name = strdup(name);
821 } else {
822 new_name = NULL;
823 hash = 0;
824 }
825
826 symbol = xmalloc(sizeof(*symbol));
827 memset(symbol, 0, sizeof(*symbol));
828 symbol->name = new_name;
829 symbol->type = S_UNKNOWN;
830 symbol->flags |= flags;
831
832 symbol->next = symbol_hash[hash];
833 symbol_hash[hash] = symbol;
834
835 return symbol;
836 }
837
sym_find(const char * name)838 struct symbol *sym_find(const char *name)
839 {
840 struct symbol *symbol = NULL;
841 int hash = 0;
842
843 if (!name)
844 return NULL;
845
846 if (name[0] && !name[1]) {
847 switch (name[0]) {
848 case 'y': return &symbol_yes;
849 case 'm': return &symbol_mod;
850 case 'n': return &symbol_no;
851 }
852 }
853 hash = strhash(name) % SYMBOL_HASHSIZE;
854
855 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
856 if (symbol->name &&
857 !strcmp(symbol->name, name) &&
858 !(symbol->flags & SYMBOL_CONST))
859 break;
860 }
861
862 return symbol;
863 }
864
865 /*
866 * Expand symbol's names embedded in the string given in argument. Symbols'
867 * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
868 * the empty string.
869 */
sym_expand_string_value(const char * in)870 const char *sym_expand_string_value(const char *in)
871 {
872 const char *src;
873 char *res;
874 size_t reslen;
875
876 reslen = strlen(in) + 1;
877 res = xmalloc(reslen);
878 res[0] = '\0';
879
880 while ((src = strchr(in, '$'))) {
881 char *p, name[SYMBOL_MAXLENGTH];
882 const char *symval = "";
883 struct symbol *sym;
884 size_t newlen;
885
886 strncat(res, in, src - in);
887 src++;
888
889 p = name;
890 while (isalnum(*src) || *src == '_')
891 *p++ = *src++;
892 *p = '\0';
893
894 sym = sym_find(name);
895 if (sym != NULL) {
896 sym_calc_value(sym);
897 symval = sym_get_string_value(sym);
898 }
899
900 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
901 if (newlen > reslen) {
902 reslen = newlen;
903 res = realloc(res, reslen);
904 }
905
906 strcat(res, symval);
907 in = src;
908 }
909 strcat(res, in);
910
911 return res;
912 }
913
sym_escape_string_value(const char * in)914 const char *sym_escape_string_value(const char *in)
915 {
916 const char *p;
917 size_t reslen;
918 char *res;
919 size_t l;
920
921 reslen = strlen(in) + strlen("\"\"") + 1;
922
923 p = in;
924 for (;;) {
925 l = strcspn(p, "\"\\");
926 p += l;
927
928 if (p[0] == '\0')
929 break;
930
931 reslen++;
932 p++;
933 }
934
935 res = xmalloc(reslen);
936 res[0] = '\0';
937
938 strcat(res, "\"");
939
940 p = in;
941 for (;;) {
942 l = strcspn(p, "\"\\");
943 strncat(res, p, l);
944 p += l;
945
946 if (p[0] == '\0')
947 break;
948
949 strcat(res, "\\");
950 strncat(res, p++, 1);
951 }
952
953 strcat(res, "\"");
954 return res;
955 }
956
sym_re_search(const char * pattern)957 struct symbol **sym_re_search(const char *pattern)
958 {
959 struct symbol *sym, **sym_arr = NULL;
960 int i, cnt, size;
961 regex_t re;
962
963 cnt = size = 0;
964 /* Skip if empty */
965 if (strlen(pattern) == 0)
966 return NULL;
967 if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
968 return NULL;
969
970 for_all_symbols(i, sym) {
971 if (sym->flags & SYMBOL_CONST || !sym->name)
972 continue;
973 if (regexec(&re, sym->name, 0, NULL, 0))
974 continue;
975 if (cnt + 1 >= size) {
976 void *tmp = sym_arr;
977 size += 16;
978 sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
979 if (!sym_arr) {
980 free(tmp);
981 return NULL;
982 }
983 }
984 sym_calc_value(sym);
985 sym_arr[cnt++] = sym;
986 }
987 if (sym_arr)
988 sym_arr[cnt] = NULL;
989 regfree(&re);
990
991 return sym_arr;
992 }
993
994 /*
995 * When we check for recursive dependencies we use a stack to save
996 * current state so we can print out relevant info to user.
997 * The entries are located on the call stack so no need to free memory.
998 * Note inser() remove() must always match to properly clear the stack.
999 */
1000 static struct dep_stack {
1001 struct dep_stack *prev, *next;
1002 struct symbol *sym;
1003 struct property *prop;
1004 struct expr *expr;
1005 } *check_top;
1006
dep_stack_insert(struct dep_stack * stack,struct symbol * sym)1007 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1008 {
1009 memset(stack, 0, sizeof(*stack));
1010 if (check_top)
1011 check_top->next = stack;
1012 stack->prev = check_top;
1013 stack->sym = sym;
1014 check_top = stack;
1015 }
1016
dep_stack_remove(void)1017 static void dep_stack_remove(void)
1018 {
1019 check_top = check_top->prev;
1020 if (check_top)
1021 check_top->next = NULL;
1022 }
1023
1024 /*
1025 * Called when we have detected a recursive dependency.
1026 * check_top point to the top of the stact so we use
1027 * the ->prev pointer to locate the bottom of the stack.
1028 */
sym_check_print_recursive(struct symbol * last_sym)1029 static void sym_check_print_recursive(struct symbol *last_sym)
1030 {
1031 struct dep_stack *stack;
1032 struct symbol *sym, *next_sym;
1033 struct menu *menu = NULL;
1034 struct property *prop;
1035 struct dep_stack cv_stack;
1036
1037 if (sym_is_choice_value(last_sym)) {
1038 dep_stack_insert(&cv_stack, last_sym);
1039 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1040 }
1041
1042 for (stack = check_top; stack != NULL; stack = stack->prev)
1043 if (stack->sym == last_sym)
1044 break;
1045 if (!stack) {
1046 fprintf(stderr, "unexpected recursive dependency error\n");
1047 return;
1048 }
1049
1050 for (; stack; stack = stack->next) {
1051 sym = stack->sym;
1052 next_sym = stack->next ? stack->next->sym : last_sym;
1053 prop = stack->prop;
1054 if (prop == NULL)
1055 prop = stack->sym->prop;
1056
1057 /* for choice values find the menu entry (used below) */
1058 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1059 for (prop = sym->prop; prop; prop = prop->next) {
1060 menu = prop->menu;
1061 if (prop->menu)
1062 break;
1063 }
1064 }
1065 if (stack->sym == last_sym)
1066 fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1067 prop->file->name, prop->lineno);
1068 if (stack->expr) {
1069 fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1070 prop->file->name, prop->lineno,
1071 sym->name ? sym->name : "<choice>",
1072 prop_get_type_name(prop->type),
1073 next_sym->name ? next_sym->name : "<choice>");
1074 } else if (stack->prop) {
1075 fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1076 prop->file->name, prop->lineno,
1077 sym->name ? sym->name : "<choice>",
1078 next_sym->name ? next_sym->name : "<choice>");
1079 } else if (sym_is_choice(sym)) {
1080 fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1081 menu->file->name, menu->lineno,
1082 sym->name ? sym->name : "<choice>",
1083 next_sym->name ? next_sym->name : "<choice>");
1084 } else if (sym_is_choice_value(sym)) {
1085 fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1086 menu->file->name, menu->lineno,
1087 sym->name ? sym->name : "<choice>",
1088 next_sym->name ? next_sym->name : "<choice>");
1089 } else {
1090 fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1091 prop->file->name, prop->lineno,
1092 sym->name ? sym->name : "<choice>",
1093 next_sym->name ? next_sym->name : "<choice>");
1094 }
1095 }
1096
1097 if (check_top == &cv_stack)
1098 dep_stack_remove();
1099 }
1100
sym_check_expr_deps(struct expr * e)1101 static struct symbol *sym_check_expr_deps(struct expr *e)
1102 {
1103 struct symbol *sym;
1104
1105 if (!e)
1106 return NULL;
1107 switch (e->type) {
1108 case E_OR:
1109 case E_AND:
1110 sym = sym_check_expr_deps(e->left.expr);
1111 if (sym)
1112 return sym;
1113 return sym_check_expr_deps(e->right.expr);
1114 case E_NOT:
1115 return sym_check_expr_deps(e->left.expr);
1116 case E_EQUAL:
1117 case E_UNEQUAL:
1118 sym = sym_check_deps(e->left.sym);
1119 if (sym)
1120 return sym;
1121 return sym_check_deps(e->right.sym);
1122 case E_SYMBOL:
1123 return sym_check_deps(e->left.sym);
1124 default:
1125 break;
1126 }
1127 printf("Oops! How to check %d?\n", e->type);
1128 return NULL;
1129 }
1130
1131 /* return NULL when dependencies are OK */
sym_check_sym_deps(struct symbol * sym)1132 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1133 {
1134 struct symbol *sym2;
1135 struct property *prop;
1136 struct dep_stack stack;
1137
1138 dep_stack_insert(&stack, sym);
1139
1140 sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1141 if (sym2)
1142 goto out;
1143
1144 for (prop = sym->prop; prop; prop = prop->next) {
1145 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1146 continue;
1147 stack.prop = prop;
1148 sym2 = sym_check_expr_deps(prop->visible.expr);
1149 if (sym2)
1150 break;
1151 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1152 continue;
1153 stack.expr = prop->expr;
1154 sym2 = sym_check_expr_deps(prop->expr);
1155 if (sym2)
1156 break;
1157 stack.expr = NULL;
1158 }
1159
1160 out:
1161 dep_stack_remove();
1162
1163 return sym2;
1164 }
1165
sym_check_choice_deps(struct symbol * choice)1166 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1167 {
1168 struct symbol *sym, *sym2;
1169 struct property *prop;
1170 struct expr *e;
1171 struct dep_stack stack;
1172
1173 dep_stack_insert(&stack, choice);
1174
1175 prop = sym_get_choice_prop(choice);
1176 expr_list_for_each_sym(prop->expr, e, sym)
1177 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1178
1179 choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1180 sym2 = sym_check_sym_deps(choice);
1181 choice->flags &= ~SYMBOL_CHECK;
1182 if (sym2)
1183 goto out;
1184
1185 expr_list_for_each_sym(prop->expr, e, sym) {
1186 sym2 = sym_check_sym_deps(sym);
1187 if (sym2)
1188 break;
1189 }
1190 out:
1191 expr_list_for_each_sym(prop->expr, e, sym)
1192 sym->flags &= ~SYMBOL_CHECK;
1193
1194 if (sym2 && sym_is_choice_value(sym2) &&
1195 prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1196 sym2 = choice;
1197
1198 dep_stack_remove();
1199
1200 return sym2;
1201 }
1202
sym_check_deps(struct symbol * sym)1203 struct symbol *sym_check_deps(struct symbol *sym)
1204 {
1205 struct symbol *sym2;
1206 struct property *prop;
1207
1208 if (sym->flags & SYMBOL_CHECK) {
1209 sym_check_print_recursive(sym);
1210 return sym;
1211 }
1212 if (sym->flags & SYMBOL_CHECKED)
1213 return NULL;
1214
1215 if (sym_is_choice_value(sym)) {
1216 struct dep_stack stack;
1217
1218 /* for choice groups start the check with main choice symbol */
1219 dep_stack_insert(&stack, sym);
1220 prop = sym_get_choice_prop(sym);
1221 sym2 = sym_check_deps(prop_get_symbol(prop));
1222 dep_stack_remove();
1223 } else if (sym_is_choice(sym)) {
1224 sym2 = sym_check_choice_deps(sym);
1225 } else {
1226 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1227 sym2 = sym_check_sym_deps(sym);
1228 sym->flags &= ~SYMBOL_CHECK;
1229 }
1230
1231 if (sym2 && sym2 == sym)
1232 sym2 = NULL;
1233
1234 return sym2;
1235 }
1236
prop_alloc(enum prop_type type,struct symbol * sym)1237 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1238 {
1239 struct property *prop;
1240 struct property **propp;
1241
1242 prop = xmalloc(sizeof(*prop));
1243 memset(prop, 0, sizeof(*prop));
1244 prop->type = type;
1245 prop->sym = sym;
1246 prop->file = current_file;
1247 prop->lineno = zconf_lineno();
1248
1249 /* append property to the prop list of symbol */
1250 if (sym) {
1251 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1252 ;
1253 *propp = prop;
1254 }
1255
1256 return prop;
1257 }
1258
prop_get_symbol(struct property * prop)1259 struct symbol *prop_get_symbol(struct property *prop)
1260 {
1261 if (prop->expr && (prop->expr->type == E_SYMBOL ||
1262 prop->expr->type == E_LIST))
1263 return prop->expr->left.sym;
1264 return NULL;
1265 }
1266
prop_get_type_name(enum prop_type type)1267 const char *prop_get_type_name(enum prop_type type)
1268 {
1269 switch (type) {
1270 case P_PROMPT:
1271 return "prompt";
1272 case P_ENV:
1273 return "env";
1274 case P_COMMENT:
1275 return "comment";
1276 case P_MENU:
1277 return "menu";
1278 case P_DEFAULT:
1279 return "default";
1280 case P_CHOICE:
1281 return "choice";
1282 case P_SELECT:
1283 return "select";
1284 case P_RANGE:
1285 return "range";
1286 case P_SYMBOL:
1287 return "symbol";
1288 case P_UNKNOWN:
1289 break;
1290 }
1291 return "unknown";
1292 }
1293
prop_add_env(const char * env)1294 static void prop_add_env(const char *env)
1295 {
1296 struct symbol *sym, *sym2;
1297 struct property *prop;
1298 char *p;
1299
1300 sym = current_entry->sym;
1301 sym->flags |= SYMBOL_AUTO;
1302 for_all_properties(sym, prop, P_ENV) {
1303 sym2 = prop_get_symbol(prop);
1304 if (strcmp(sym2->name, env))
1305 menu_warn(current_entry, "redefining environment symbol from %s",
1306 sym2->name);
1307 return;
1308 }
1309
1310 prop = prop_alloc(P_ENV, sym);
1311 prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1312
1313 sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1314 sym_env_list->right.sym = sym;
1315
1316 p = getenv(env);
1317 if (p)
1318 sym_add_default(sym, p);
1319 else
1320 menu_warn(current_entry, "environment variable %s undefined", env);
1321 }
1322