[PATCH] dvb: usb: support Medion hybrid USB2.0 DVB-T/analogue box
[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_YES|SYMBOL_VALID,
19 }, symbol_mod = {
20         .name = "m",
21         .curr = { "m", mod },
22         .flags = SYMBOL_MOD|SYMBOL_VALID,
23 }, symbol_no = {
24         .name = "n",
25         .curr = { "n", no },
26         .flags = SYMBOL_NO|SYMBOL_VALID,
27 }, symbol_empty = {
28         .name = "",
29         .curr = { "", no },
30         .flags = SYMBOL_VALID,
31 };
32
33 int sym_change_count;
34 struct symbol *modules_sym;
35 tristate modules_val;
36
37 void sym_add_default(struct symbol *sym, const char *def)
38 {
39         struct property *prop = prop_alloc(P_DEFAULT, sym);
40
41         prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
42 }
43
44 void sym_init(void)
45 {
46         struct symbol *sym;
47         struct utsname uts;
48         char *p;
49         static bool inited = false;
50
51         if (inited)
52                 return;
53         inited = true;
54
55         uname(&uts);
56
57         sym = sym_lookup("ARCH", 0);
58         sym->type = S_STRING;
59         sym->flags |= SYMBOL_AUTO;
60         p = getenv("ARCH");
61         if (p)
62                 sym_add_default(sym, p);
63
64         sym = sym_lookup("KERNELRELEASE", 0);
65         sym->type = S_STRING;
66         sym->flags |= SYMBOL_AUTO;
67         p = getenv("KERNELRELEASE");
68         if (p)
69                 sym_add_default(sym, p);
70
71         sym = sym_lookup("UNAME_RELEASE", 0);
72         sym->type = S_STRING;
73         sym->flags |= SYMBOL_AUTO;
74         sym_add_default(sym, uts.release);
75 }
76
77 enum symbol_type sym_get_type(struct symbol *sym)
78 {
79         enum symbol_type type = sym->type;
80
81         if (type == S_TRISTATE) {
82                 if (sym_is_choice_value(sym) && sym->visible == yes)
83                         type = S_BOOLEAN;
84                 else if (modules_val == no)
85                         type = S_BOOLEAN;
86         }
87         return type;
88 }
89
90 const char *sym_type_name(enum symbol_type type)
91 {
92         switch (type) {
93         case S_BOOLEAN:
94                 return "boolean";
95         case S_TRISTATE:
96                 return "tristate";
97         case S_INT:
98                 return "integer";
99         case S_HEX:
100                 return "hex";
101         case S_STRING:
102                 return "string";
103         case S_UNKNOWN:
104                 return "unknown";
105         case S_OTHER:
106                 break;
107         }
108         return "???";
109 }
110
111 struct property *sym_get_choice_prop(struct symbol *sym)
112 {
113         struct property *prop;
114
115         for_all_choices(sym, prop)
116                 return prop;
117         return NULL;
118 }
119
120 struct property *sym_get_default_prop(struct symbol *sym)
121 {
122         struct property *prop;
123
124         for_all_defaults(sym, prop) {
125                 prop->visible.tri = expr_calc_value(prop->visible.expr);
126                 if (prop->visible.tri != no)
127                         return prop;
128         }
129         return NULL;
130 }
131
132 struct property *sym_get_range_prop(struct symbol *sym)
133 {
134         struct property *prop;
135
136         for_all_properties(sym, prop, P_RANGE) {
137                 prop->visible.tri = expr_calc_value(prop->visible.expr);
138                 if (prop->visible.tri != no)
139                         return prop;
140         }
141         return NULL;
142 }
143
144 static void sym_calc_visibility(struct symbol *sym)
145 {
146         struct property *prop;
147         tristate tri;
148
149         /* any prompt visible? */
150         tri = no;
151         for_all_prompts(sym, prop) {
152                 prop->visible.tri = expr_calc_value(prop->visible.expr);
153                 tri = E_OR(tri, prop->visible.tri);
154         }
155         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
156                 tri = yes;
157         if (sym->visible != tri) {
158                 sym->visible = tri;
159                 sym_set_changed(sym);
160         }
161         if (sym_is_choice_value(sym))
162                 return;
163         tri = no;
164         if (sym->rev_dep.expr)
165                 tri = expr_calc_value(sym->rev_dep.expr);
166         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
167                 tri = yes;
168         if (sym->rev_dep.tri != tri) {
169                 sym->rev_dep.tri = tri;
170                 sym_set_changed(sym);
171         }
172 }
173
174 static struct symbol *sym_calc_choice(struct symbol *sym)
175 {
176         struct symbol *def_sym;
177         struct property *prop;
178         struct expr *e;
179
180         /* is the user choice visible? */
181         def_sym = sym->user.val;
182         if (def_sym) {
183                 sym_calc_visibility(def_sym);
184                 if (def_sym->visible != no)
185                         return def_sym;
186         }
187
188         /* any of the defaults visible? */
189         for_all_defaults(sym, prop) {
190                 prop->visible.tri = expr_calc_value(prop->visible.expr);
191                 if (prop->visible.tri == no)
192                         continue;
193                 def_sym = prop_get_symbol(prop);
194                 sym_calc_visibility(def_sym);
195                 if (def_sym->visible != no)
196                         return def_sym;
197         }
198
199         /* just get the first visible value */
200         prop = sym_get_choice_prop(sym);
201         for (e = prop->expr; e; e = e->left.expr) {
202                 def_sym = e->right.sym;
203                 sym_calc_visibility(def_sym);
204                 if (def_sym->visible != no)
205                         return def_sym;
206         }
207
208         /* no choice? reset tristate value */
209         sym->curr.tri = no;
210         return NULL;
211 }
212
213 void sym_calc_value(struct symbol *sym)
214 {
215         struct symbol_value newval, oldval;
216         struct property *prop;
217         struct expr *e;
218
219         if (!sym)
220                 return;
221
222         if (sym->flags & SYMBOL_VALID)
223                 return;
224         sym->flags |= SYMBOL_VALID;
225
226         oldval = sym->curr;
227
228         switch (sym->type) {
229         case S_INT:
230         case S_HEX:
231         case S_STRING:
232                 newval = symbol_empty.curr;
233                 break;
234         case S_BOOLEAN:
235         case S_TRISTATE:
236                 newval = symbol_no.curr;
237                 break;
238         default:
239                 sym->curr.val = sym->name;
240                 sym->curr.tri = no;
241                 return;
242         }
243         if (!sym_is_choice_value(sym))
244                 sym->flags &= ~SYMBOL_WRITE;
245
246         sym_calc_visibility(sym);
247
248         /* set default if recursively called */
249         sym->curr = newval;
250
251         switch (sym_get_type(sym)) {
252         case S_BOOLEAN:
253         case S_TRISTATE:
254                 if (sym_is_choice_value(sym) && sym->visible == yes) {
255                         prop = sym_get_choice_prop(sym);
256                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
257                 } else if (E_OR(sym->visible, sym->rev_dep.tri) != no) {
258                         sym->flags |= SYMBOL_WRITE;
259                         if (sym_has_value(sym))
260                                 newval.tri = sym->user.tri;
261                         else if (!sym_is_choice(sym)) {
262                                 prop = sym_get_default_prop(sym);
263                                 if (prop)
264                                         newval.tri = expr_calc_value(prop->expr);
265                         }
266                         newval.tri = E_OR(E_AND(newval.tri, sym->visible), sym->rev_dep.tri);
267                 } else if (!sym_is_choice(sym)) {
268                         prop = sym_get_default_prop(sym);
269                         if (prop) {
270                                 sym->flags |= SYMBOL_WRITE;
271                                 newval.tri = expr_calc_value(prop->expr);
272                         }
273                 }
274                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
275                         newval.tri = yes;
276                 break;
277         case S_STRING:
278         case S_HEX:
279         case S_INT:
280                 if (sym->visible != no) {
281                         sym->flags |= SYMBOL_WRITE;
282                         if (sym_has_value(sym)) {
283                                 newval.val = sym->user.val;
284                                 break;
285                         }
286                 }
287                 prop = sym_get_default_prop(sym);
288                 if (prop) {
289                         struct symbol *ds = prop_get_symbol(prop);
290                         if (ds) {
291                                 sym->flags |= SYMBOL_WRITE;
292                                 sym_calc_value(ds);
293                                 newval.val = ds->curr.val;
294                         }
295                 }
296                 break;
297         default:
298                 ;
299         }
300
301         sym->curr = newval;
302         if (sym_is_choice(sym) && newval.tri == yes)
303                 sym->curr.val = sym_calc_choice(sym);
304
305         if (memcmp(&oldval, &sym->curr, sizeof(oldval)))
306                 sym_set_changed(sym);
307         if (modules_sym == sym)
308                 modules_val = modules_sym->curr.tri;
309
310         if (sym_is_choice(sym)) {
311                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
312                 prop = sym_get_choice_prop(sym);
313                 for (e = prop->expr; e; e = e->left.expr) {
314                         e->right.sym->flags |= flags;
315                         if (flags & SYMBOL_CHANGED)
316                                 sym_set_changed(e->right.sym);
317                 }
318         }
319 }
320
321 void sym_clear_all_valid(void)
322 {
323         struct symbol *sym;
324         int i;
325
326         for_all_symbols(i, sym)
327                 sym->flags &= ~SYMBOL_VALID;
328         sym_change_count++;
329         if (modules_sym)
330                 sym_calc_value(modules_sym);
331 }
332
333 void sym_set_changed(struct symbol *sym)
334 {
335         struct property *prop;
336
337         sym->flags |= SYMBOL_CHANGED;
338         for (prop = sym->prop; prop; prop = prop->next) {
339                 if (prop->menu)
340                         prop->menu->flags |= MENU_CHANGED;
341         }
342 }
343
344 void sym_set_all_changed(void)
345 {
346         struct symbol *sym;
347         int i;
348
349         for_all_symbols(i, sym)
350                 sym_set_changed(sym);
351 }
352
353 bool sym_tristate_within_range(struct symbol *sym, tristate val)
354 {
355         int type = sym_get_type(sym);
356
357         if (sym->visible == no)
358                 return false;
359
360         if (type != S_BOOLEAN && type != S_TRISTATE)
361                 return false;
362
363         if (type == S_BOOLEAN && val == mod)
364                 return false;
365         if (sym->visible <= sym->rev_dep.tri)
366                 return false;
367         if (sym_is_choice_value(sym) && sym->visible == yes)
368                 return val == yes;
369         return val >= sym->rev_dep.tri && val <= sym->visible;
370 }
371
372 bool sym_set_tristate_value(struct symbol *sym, tristate val)
373 {
374         tristate oldval = sym_get_tristate_value(sym);
375
376         if (oldval != val && !sym_tristate_within_range(sym, val))
377                 return false;
378
379         if (sym->flags & SYMBOL_NEW) {
380                 sym->flags &= ~SYMBOL_NEW;
381                 sym_set_changed(sym);
382         }
383         if (sym_is_choice_value(sym) && val == yes) {
384                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
385
386                 cs->user.val = sym;
387                 cs->flags &= ~SYMBOL_NEW;
388         }
389
390         sym->user.tri = val;
391         if (oldval != val) {
392                 sym_clear_all_valid();
393                 if (sym == modules_sym)
394                         sym_set_all_changed();
395         }
396
397         return true;
398 }
399
400 tristate sym_toggle_tristate_value(struct symbol *sym)
401 {
402         tristate oldval, newval;
403
404         oldval = newval = sym_get_tristate_value(sym);
405         do {
406                 switch (newval) {
407                 case no:
408                         newval = mod;
409                         break;
410                 case mod:
411                         newval = yes;
412                         break;
413                 case yes:
414                         newval = no;
415                         break;
416                 }
417                 if (sym_set_tristate_value(sym, newval))
418                         break;
419         } while (oldval != newval);
420         return newval;
421 }
422
423 bool sym_string_valid(struct symbol *sym, const char *str)
424 {
425         signed char ch;
426
427         switch (sym->type) {
428         case S_STRING:
429                 return true;
430         case S_INT:
431                 ch = *str++;
432                 if (ch == '-')
433                         ch = *str++;
434                 if (!isdigit(ch))
435                         return false;
436                 if (ch == '0' && *str != 0)
437                         return false;
438                 while ((ch = *str++)) {
439                         if (!isdigit(ch))
440                                 return false;
441                 }
442                 return true;
443         case S_HEX:
444                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
445                         str += 2;
446                 ch = *str++;
447                 do {
448                         if (!isxdigit(ch))
449                                 return false;
450                 } while ((ch = *str++));
451                 return true;
452         case S_BOOLEAN:
453         case S_TRISTATE:
454                 switch (str[0]) {
455                 case 'y': case 'Y':
456                 case 'm': case 'M':
457                 case 'n': case 'N':
458                         return true;
459                 }
460                 return false;
461         default:
462                 return false;
463         }
464 }
465
466 bool sym_string_within_range(struct symbol *sym, const char *str)
467 {
468         struct property *prop;
469         int val;
470
471         switch (sym->type) {
472         case S_STRING:
473                 return sym_string_valid(sym, str);
474         case S_INT:
475                 if (!sym_string_valid(sym, str))
476                         return false;
477                 prop = sym_get_range_prop(sym);
478                 if (!prop)
479                         return true;
480                 val = strtol(str, NULL, 10);
481                 return val >= strtol(prop->expr->left.sym->name, NULL, 10) &&
482                        val <= strtol(prop->expr->right.sym->name, NULL, 10);
483         case S_HEX:
484                 if (!sym_string_valid(sym, str))
485                         return false;
486                 prop = sym_get_range_prop(sym);
487                 if (!prop)
488                         return true;
489                 val = strtol(str, NULL, 16);
490                 return val >= strtol(prop->expr->left.sym->name, NULL, 16) &&
491                        val <= strtol(prop->expr->right.sym->name, NULL, 16);
492         case S_BOOLEAN:
493         case S_TRISTATE:
494                 switch (str[0]) {
495                 case 'y': case 'Y':
496                         return sym_tristate_within_range(sym, yes);
497                 case 'm': case 'M':
498                         return sym_tristate_within_range(sym, mod);
499                 case 'n': case 'N':
500                         return sym_tristate_within_range(sym, no);
501                 }
502                 return false;
503         default:
504                 return false;
505         }
506 }
507
508 bool sym_set_string_value(struct symbol *sym, const char *newval)
509 {
510         const char *oldval;
511         char *val;
512         int size;
513
514         switch (sym->type) {
515         case S_BOOLEAN:
516         case S_TRISTATE:
517                 switch (newval[0]) {
518                 case 'y': case 'Y':
519                         return sym_set_tristate_value(sym, yes);
520                 case 'm': case 'M':
521                         return sym_set_tristate_value(sym, mod);
522                 case 'n': case 'N':
523                         return sym_set_tristate_value(sym, no);
524                 }
525                 return false;
526         default:
527                 ;
528         }
529
530         if (!sym_string_within_range(sym, newval))
531                 return false;
532
533         if (sym->flags & SYMBOL_NEW) {
534                 sym->flags &= ~SYMBOL_NEW;
535                 sym_set_changed(sym);
536         }
537
538         oldval = sym->user.val;
539         size = strlen(newval) + 1;
540         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
541                 size += 2;
542                 sym->user.val = val = malloc(size);
543                 *val++ = '0';
544                 *val++ = 'x';
545         } else if (!oldval || strcmp(oldval, newval))
546                 sym->user.val = val = malloc(size);
547         else
548                 return true;
549
550         strcpy(val, newval);
551         free((void *)oldval);
552         sym_clear_all_valid();
553
554         return true;
555 }
556
557 const char *sym_get_string_value(struct symbol *sym)
558 {
559         tristate val;
560
561         switch (sym->type) {
562         case S_BOOLEAN:
563         case S_TRISTATE:
564                 val = sym_get_tristate_value(sym);
565                 switch (val) {
566                 case no:
567                         return "n";
568                 case mod:
569                         return "m";
570                 case yes:
571                         return "y";
572                 }
573                 break;
574         default:
575                 ;
576         }
577         return (const char *)sym->curr.val;
578 }
579
580 bool sym_is_changable(struct symbol *sym)
581 {
582         return sym->visible > sym->rev_dep.tri;
583 }
584
585 struct symbol *sym_lookup(const char *name, int isconst)
586 {
587         struct symbol *symbol;
588         const char *ptr;
589         char *new_name;
590         int hash = 0;
591
592         if (name) {
593                 if (name[0] && !name[1]) {
594                         switch (name[0]) {
595                         case 'y': return &symbol_yes;
596                         case 'm': return &symbol_mod;
597                         case 'n': return &symbol_no;
598                         }
599                 }
600                 for (ptr = name; *ptr; ptr++)
601                         hash += *ptr;
602                 hash &= 0xff;
603
604                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
605                         if (!strcmp(symbol->name, name)) {
606                                 if ((isconst && symbol->flags & SYMBOL_CONST) ||
607                                     (!isconst && !(symbol->flags & SYMBOL_CONST)))
608                                         return symbol;
609                         }
610                 }
611                 new_name = strdup(name);
612         } else {
613                 new_name = NULL;
614                 hash = 256;
615         }
616
617         symbol = malloc(sizeof(*symbol));
618         memset(symbol, 0, sizeof(*symbol));
619         symbol->name = new_name;
620         symbol->type = S_UNKNOWN;
621         symbol->flags = SYMBOL_NEW;
622         if (isconst)
623                 symbol->flags |= SYMBOL_CONST;
624
625         symbol->next = symbol_hash[hash];
626         symbol_hash[hash] = symbol;
627
628         return symbol;
629 }
630
631 struct symbol *sym_find(const char *name)
632 {
633         struct symbol *symbol = NULL;
634         const char *ptr;
635         int hash = 0;
636
637         if (!name)
638                 return NULL;
639
640         if (name[0] && !name[1]) {
641                 switch (name[0]) {
642                 case 'y': return &symbol_yes;
643                 case 'm': return &symbol_mod;
644                 case 'n': return &symbol_no;
645                 }
646         }
647         for (ptr = name; *ptr; ptr++)
648                 hash += *ptr;
649         hash &= 0xff;
650
651         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
652                 if (!strcmp(symbol->name, name) &&
653                     !(symbol->flags & SYMBOL_CONST))
654                                 break;
655         }
656
657         return symbol;
658 }
659
660 struct symbol **sym_re_search(const char *pattern)
661 {
662         struct symbol *sym, **sym_arr = NULL;
663         int i, cnt, size;
664         regex_t re;
665
666         cnt = size = 0;
667         /* Skip if empty */
668         if (strlen(pattern) == 0)
669                 return NULL;
670         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
671                 return NULL;
672
673         for_all_symbols(i, sym) {
674                 if (sym->flags & SYMBOL_CONST || !sym->name)
675                         continue;
676                 if (regexec(&re, sym->name, 0, NULL, 0))
677                         continue;
678                 if (cnt + 1 >= size) {
679                         void *tmp = sym_arr;
680                         size += 16;
681                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
682                         if (!sym_arr) {
683                                 free(tmp);
684                                 return NULL;
685                         }
686                 }
687                 sym_arr[cnt++] = sym;
688         }
689         if (sym_arr)
690                 sym_arr[cnt] = NULL;
691         regfree(&re);
692
693         return sym_arr;
694 }
695
696
697 struct symbol *sym_check_deps(struct symbol *sym);
698
699 static struct symbol *sym_check_expr_deps(struct expr *e)
700 {
701         struct symbol *sym;
702
703         if (!e)
704                 return NULL;
705         switch (e->type) {
706         case E_OR:
707         case E_AND:
708                 sym = sym_check_expr_deps(e->left.expr);
709                 if (sym)
710                         return sym;
711                 return sym_check_expr_deps(e->right.expr);
712         case E_NOT:
713                 return sym_check_expr_deps(e->left.expr);
714         case E_EQUAL:
715         case E_UNEQUAL:
716                 sym = sym_check_deps(e->left.sym);
717                 if (sym)
718                         return sym;
719                 return sym_check_deps(e->right.sym);
720         case E_SYMBOL:
721                 return sym_check_deps(e->left.sym);
722         default:
723                 break;
724         }
725         printf("Oops! How to check %d?\n", e->type);
726         return NULL;
727 }
728
729 struct symbol *sym_check_deps(struct symbol *sym)
730 {
731         struct symbol *sym2;
732         struct property *prop;
733
734         if (sym->flags & SYMBOL_CHECK_DONE)
735                 return NULL;
736         if (sym->flags & SYMBOL_CHECK) {
737                 printf("Warning! Found recursive dependency: %s", sym->name);
738                 return sym;
739         }
740
741         sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
742         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
743         if (sym2)
744                 goto out;
745
746         for (prop = sym->prop; prop; prop = prop->next) {
747                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
748                         continue;
749                 sym2 = sym_check_expr_deps(prop->visible.expr);
750                 if (sym2)
751                         goto out;
752                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
753                         continue;
754                 sym2 = sym_check_expr_deps(prop->expr);
755                 if (sym2)
756                         goto out;
757         }
758 out:
759         if (sym2)
760                 printf(" %s", sym->name);
761         sym->flags &= ~SYMBOL_CHECK;
762         return sym2;
763 }
764
765 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
766 {
767         struct property *prop;
768         struct property **propp;
769
770         prop = malloc(sizeof(*prop));
771         memset(prop, 0, sizeof(*prop));
772         prop->type = type;
773         prop->sym = sym;
774         prop->file = current_file;
775         prop->lineno = zconf_lineno();
776
777         /* append property to the prop list of symbol */
778         if (sym) {
779                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
780                         ;
781                 *propp = prop;
782         }
783
784         return prop;
785 }
786
787 struct symbol *prop_get_symbol(struct property *prop)
788 {
789         if (prop->expr && (prop->expr->type == E_SYMBOL ||
790                            prop->expr->type == E_CHOICE))
791                 return prop->expr->left.sym;
792         return NULL;
793 }
794
795 const char *prop_get_type_name(enum prop_type type)
796 {
797         switch (type) {
798         case P_PROMPT:
799                 return "prompt";
800         case P_COMMENT:
801                 return "comment";
802         case P_MENU:
803                 return "menu";
804         case P_DEFAULT:
805                 return "default";
806         case P_CHOICE:
807                 return "choice";
808         case P_SELECT:
809                 return "select";
810         case P_RANGE:
811                 return "range";
812         case P_UNKNOWN:
813                 break;
814         }
815         return "unknown";
816 }