0586085136d1304eebaa43142be468e4a7f40c8c
[linux-2.6.git] / scripts / kconfig / confdata.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 <sys/stat.h>
7 #include <ctype.h>
8 #include <errno.h>
9 #include <fcntl.h>
10 #include <stdarg.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <time.h>
15 #include <unistd.h>
16
17 #include "lkc.h"
18
19 static void conf_warning(const char *fmt, ...)
20         __attribute__ ((format (printf, 1, 2)));
21
22 static void conf_message(const char *fmt, ...)
23         __attribute__ ((format (printf, 1, 2)));
24
25 static const char *conf_filename;
26 static int conf_lineno, conf_warnings, conf_unsaved;
27
28 const char conf_defname[] = "arch/$ARCH/defconfig";
29
30 static void conf_warning(const char *fmt, ...)
31 {
32         va_list ap;
33         va_start(ap, fmt);
34         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
35         vfprintf(stderr, fmt, ap);
36         fprintf(stderr, "\n");
37         va_end(ap);
38         conf_warnings++;
39 }
40
41 static void conf_default_message_callback(const char *fmt, va_list ap)
42 {
43         printf("#\n# ");
44         vprintf(fmt, ap);
45         printf("\n#\n");
46 }
47
48 static void (*conf_message_callback) (const char *fmt, va_list ap) =
49         conf_default_message_callback;
50 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
51 {
52         conf_message_callback = fn;
53 }
54
55 static void conf_message(const char *fmt, ...)
56 {
57         va_list ap;
58
59         va_start(ap, fmt);
60         if (conf_message_callback)
61                 conf_message_callback(fmt, ap);
62 }
63
64 const char *conf_get_configname(void)
65 {
66         char *name = getenv("KCONFIG_CONFIG");
67
68         return name ? name : ".config";
69 }
70
71 const char *conf_get_autoconfig_name(void)
72 {
73         char *name = getenv("KCONFIG_AUTOCONFIG");
74
75         return name ? name : "include/config/auto.conf";
76 }
77
78 static char *conf_expand_value(const char *in)
79 {
80         struct symbol *sym;
81         const char *src;
82         static char res_value[SYMBOL_MAXLENGTH];
83         char *dst, name[SYMBOL_MAXLENGTH];
84
85         res_value[0] = 0;
86         dst = name;
87         while ((src = strchr(in, '$'))) {
88                 strncat(res_value, in, src - in);
89                 src++;
90                 dst = name;
91                 while (isalnum(*src) || *src == '_')
92                         *dst++ = *src++;
93                 *dst = 0;
94                 sym = sym_lookup(name, 0);
95                 sym_calc_value(sym);
96                 strcat(res_value, sym_get_string_value(sym));
97                 in = src;
98         }
99         strcat(res_value, in);
100
101         return res_value;
102 }
103
104 char *conf_get_default_confname(void)
105 {
106         struct stat buf;
107         static char fullname[PATH_MAX+1];
108         char *env, *name;
109
110         name = conf_expand_value(conf_defname);
111         env = getenv(SRCTREE);
112         if (env) {
113                 sprintf(fullname, "%s/%s", env, name);
114                 if (!stat(fullname, &buf))
115                         return fullname;
116         }
117         return name;
118 }
119
120 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
121 {
122         char *p2;
123
124         switch (sym->type) {
125         case S_TRISTATE:
126                 if (p[0] == 'm') {
127                         sym->def[def].tri = mod;
128                         sym->flags |= def_flags;
129                         break;
130                 }
131                 /* fall through */
132         case S_BOOLEAN:
133                 if (p[0] == 'y') {
134                         sym->def[def].tri = yes;
135                         sym->flags |= def_flags;
136                         break;
137                 }
138                 if (p[0] == 'n') {
139                         sym->def[def].tri = no;
140                         sym->flags |= def_flags;
141                         break;
142                 }
143                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
144                 return 1;
145         case S_OTHER:
146                 if (*p != '"') {
147                         for (p2 = p; *p2 && !isspace(*p2); p2++)
148                                 ;
149                         sym->type = S_STRING;
150                         goto done;
151                 }
152                 /* fall through */
153         case S_STRING:
154                 if (*p++ != '"')
155                         break;
156                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
157                         if (*p2 == '"') {
158                                 *p2 = 0;
159                                 break;
160                         }
161                         memmove(p2, p2 + 1, strlen(p2));
162                 }
163                 if (!p2) {
164                         conf_warning("invalid string found");
165                         return 1;
166                 }
167                 /* fall through */
168         case S_INT:
169         case S_HEX:
170         done:
171                 if (sym_string_valid(sym, p)) {
172                         sym->def[def].val = strdup(p);
173                         sym->flags |= def_flags;
174                 } else {
175                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
176                         return 1;
177                 }
178                 break;
179         default:
180                 ;
181         }
182         return 0;
183 }
184
185 int conf_read_simple(const char *name, int def)
186 {
187         FILE *in = NULL;
188         char line[1024];
189         char *p, *p2;
190         struct symbol *sym;
191         int i, def_flags;
192
193         if (name) {
194                 in = zconf_fopen(name);
195         } else {
196                 struct property *prop;
197
198                 name = conf_get_configname();
199                 in = zconf_fopen(name);
200                 if (in)
201                         goto load;
202                 sym_add_change_count(1);
203                 if (!sym_defconfig_list) {
204                         if (modules_sym)
205                                 sym_calc_value(modules_sym);
206                         return 1;
207                 }
208
209                 for_all_defaults(sym_defconfig_list, prop) {
210                         if (expr_calc_value(prop->visible.expr) == no ||
211                             prop->expr->type != E_SYMBOL)
212                                 continue;
213                         name = conf_expand_value(prop->expr->left.sym->name);
214                         in = zconf_fopen(name);
215                         if (in) {
216                                 conf_message(_("using defaults found in %s"),
217                                          name);
218                                 goto load;
219                         }
220                 }
221         }
222         if (!in)
223                 return 1;
224
225 load:
226         conf_filename = name;
227         conf_lineno = 0;
228         conf_warnings = 0;
229         conf_unsaved = 0;
230
231         def_flags = SYMBOL_DEF << def;
232         for_all_symbols(i, sym) {
233                 sym->flags |= SYMBOL_CHANGED;
234                 sym->flags &= ~(def_flags|SYMBOL_VALID);
235                 if (sym_is_choice(sym))
236                         sym->flags |= def_flags;
237                 switch (sym->type) {
238                 case S_INT:
239                 case S_HEX:
240                 case S_STRING:
241                         if (sym->def[def].val)
242                                 free(sym->def[def].val);
243                         /* fall through */
244                 default:
245                         sym->def[def].val = NULL;
246                         sym->def[def].tri = no;
247                 }
248         }
249
250         while (fgets(line, sizeof(line), in)) {
251                 conf_lineno++;
252                 sym = NULL;
253                 if (line[0] == '#') {
254                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
255                                 continue;
256                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
257                         if (!p)
258                                 continue;
259                         *p++ = 0;
260                         if (strncmp(p, "is not set", 10))
261                                 continue;
262                         if (def == S_DEF_USER) {
263                                 sym = sym_find(line + 2 + strlen(CONFIG_));
264                                 if (!sym) {
265                                         sym_add_change_count(1);
266                                         goto setsym;
267                                 }
268                         } else {
269                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
270                                 if (sym->type == S_UNKNOWN)
271                                         sym->type = S_BOOLEAN;
272                         }
273                         if (sym->flags & def_flags) {
274                                 conf_warning("override: reassigning to symbol %s", sym->name);
275                         }
276                         switch (sym->type) {
277                         case S_BOOLEAN:
278                         case S_TRISTATE:
279                                 sym->def[def].tri = no;
280                                 sym->flags |= def_flags;
281                                 break;
282                         default:
283                                 ;
284                         }
285                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
286                         p = strchr(line + strlen(CONFIG_), '=');
287                         if (!p)
288                                 continue;
289                         *p++ = 0;
290                         p2 = strchr(p, '\n');
291                         if (p2) {
292                                 *p2-- = 0;
293                                 if (*p2 == '\r')
294                                         *p2 = 0;
295                         }
296                         if (def == S_DEF_USER) {
297                                 sym = sym_find(line + strlen(CONFIG_));
298                                 if (!sym) {
299                                         sym_add_change_count(1);
300                                         goto setsym;
301                                 }
302                         } else {
303                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
304                                 if (sym->type == S_UNKNOWN)
305                                         sym->type = S_OTHER;
306                         }
307                         if (sym->flags & def_flags) {
308                                 conf_warning("override: reassigning to symbol %s", sym->name);
309                         }
310                         if (conf_set_sym_val(sym, def, def_flags, p))
311                                 continue;
312                 } else {
313                         if (line[0] != '\r' && line[0] != '\n')
314                                 conf_warning("unexpected data");
315                         continue;
316                 }
317 setsym:
318                 if (sym && sym_is_choice_value(sym)) {
319                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
320                         switch (sym->def[def].tri) {
321                         case no:
322                                 break;
323                         case mod:
324                                 if (cs->def[def].tri == yes) {
325                                         conf_warning("%s creates inconsistent choice state", sym->name);
326                                         cs->flags &= ~def_flags;
327                                 }
328                                 break;
329                         case yes:
330                                 if (cs->def[def].tri != no)
331                                         conf_warning("override: %s changes choice state", sym->name);
332                                 cs->def[def].val = sym;
333                                 break;
334                         }
335                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
336                 }
337         }
338         fclose(in);
339
340         if (modules_sym)
341                 sym_calc_value(modules_sym);
342         return 0;
343 }
344
345 int conf_read(const char *name)
346 {
347         struct symbol *sym;
348         int i;
349
350         sym_set_change_count(0);
351
352         if (conf_read_simple(name, S_DEF_USER))
353                 return 1;
354
355         for_all_symbols(i, sym) {
356                 sym_calc_value(sym);
357                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
358                         continue;
359                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
360                         /* check that calculated value agrees with saved value */
361                         switch (sym->type) {
362                         case S_BOOLEAN:
363                         case S_TRISTATE:
364                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
365                                         break;
366                                 if (!sym_is_choice(sym))
367                                         continue;
368                                 /* fall through */
369                         default:
370                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
371                                         continue;
372                                 break;
373                         }
374                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
375                         /* no previous value and not saved */
376                         continue;
377                 conf_unsaved++;
378                 /* maybe print value in verbose mode... */
379         }
380
381         for_all_symbols(i, sym) {
382                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
383                         /* Reset values of generates values, so they'll appear
384                          * as new, if they should become visible, but that
385                          * doesn't quite work if the Kconfig and the saved
386                          * configuration disagree.
387                          */
388                         if (sym->visible == no && !conf_unsaved)
389                                 sym->flags &= ~SYMBOL_DEF_USER;
390                         switch (sym->type) {
391                         case S_STRING:
392                         case S_INT:
393                         case S_HEX:
394                                 /* Reset a string value if it's out of range */
395                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
396                                         break;
397                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
398                                 conf_unsaved++;
399                                 break;
400                         default:
401                                 break;
402                         }
403                 }
404         }
405
406         sym_add_change_count(conf_warnings || conf_unsaved);
407
408         return 0;
409 }
410
411 /*
412  * Kconfig configuration printer
413  *
414  * This printer is used when generating the resulting configuration after
415  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
416  * passing a non-NULL argument to the printer.
417  *
418  */
419 static void
420 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
421 {
422
423         switch (sym->type) {
424         case S_BOOLEAN:
425         case S_TRISTATE:
426                 if (*value == 'n') {
427                         bool skip_unset = (arg != NULL);
428
429                         if (!skip_unset)
430                                 fprintf(fp, "# %s%s is not set\n",
431                                     CONFIG_, sym->name);
432                         return;
433                 }
434                 break;
435         default:
436                 break;
437         }
438
439         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
440 }
441
442 static void
443 kconfig_print_comment(FILE *fp, const char *value, void *arg)
444 {
445         const char *p = value;
446         size_t l;
447
448         for (;;) {
449                 l = strcspn(p, "\n");
450                 fprintf(fp, "#");
451                 if (l) {
452                         fprintf(fp, " ");
453                         xfwrite(p, l, 1, fp);
454                         p += l;
455                 }
456                 fprintf(fp, "\n");
457                 if (*p++ == '\0')
458                         break;
459         }
460 }
461
462 static struct conf_printer kconfig_printer_cb =
463 {
464         .print_symbol = kconfig_print_symbol,
465         .print_comment = kconfig_print_comment,
466 };
467
468 /*
469  * Header printer
470  *
471  * This printer is used when generating the `include/generated/autoconf.h' file.
472  */
473 static void
474 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
475 {
476
477         switch (sym->type) {
478         case S_BOOLEAN:
479         case S_TRISTATE: {
480                 const char *suffix = "";
481
482                 switch (*value) {
483                 case 'n':
484                         break;
485                 case 'm':
486                         suffix = "_MODULE";
487                         /* fall through */
488                 default:
489                         fprintf(fp, "#define %s%s%s 1\n",
490                             CONFIG_, sym->name, suffix);
491                 }
492                 break;
493         }
494         case S_HEX: {
495                 const char *prefix = "";
496
497                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
498                         prefix = "0x";
499                 fprintf(fp, "#define %s%s %s%s\n",
500                     CONFIG_, sym->name, prefix, value);
501                 break;
502         }
503         case S_STRING:
504         case S_INT:
505                 fprintf(fp, "#define %s%s %s\n",
506                     CONFIG_, sym->name, value);
507                 break;
508         default:
509                 break;
510         }
511
512 }
513
514 static void
515 header_print_comment(FILE *fp, const char *value, void *arg)
516 {
517         const char *p = value;
518         size_t l;
519
520         fprintf(fp, "/*\n");
521         for (;;) {
522                 l = strcspn(p, "\n");
523                 fprintf(fp, " *");
524                 if (l) {
525                         fprintf(fp, " ");
526                         xfwrite(p, l, 1, fp);
527                         p += l;
528                 }
529                 fprintf(fp, "\n");
530                 if (*p++ == '\0')
531                         break;
532         }
533         fprintf(fp, " */\n");
534 }
535
536 static struct conf_printer header_printer_cb =
537 {
538         .print_symbol = header_print_symbol,
539         .print_comment = header_print_comment,
540 };
541
542 /*
543  * Generate the __enabled_CONFIG_* and __enabled_CONFIG_*_MODULE macros for
544  * use by the IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
545  * generated even for booleans so that the IS_ENABLED() macro works.
546  */
547 static void
548 header_print__enabled_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
549 {
550
551         switch (sym->type) {
552         case S_BOOLEAN:
553         case S_TRISTATE: {
554                 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
555                     sym->name, (*value == 'y'));
556                 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
557                     sym->name, (*value == 'm'));
558                 break;
559         }
560         default:
561                 break;
562         }
563 }
564
565 static struct conf_printer header__enabled_printer_cb =
566 {
567         .print_symbol = header_print__enabled_symbol,
568         .print_comment = header_print_comment,
569 };
570
571 /*
572  * Tristate printer
573  *
574  * This printer is used when generating the `include/config/tristate.conf' file.
575  */
576 static void
577 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
578 {
579
580         if (sym->type == S_TRISTATE && *value != 'n')
581                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
582 }
583
584 static struct conf_printer tristate_printer_cb =
585 {
586         .print_symbol = tristate_print_symbol,
587         .print_comment = kconfig_print_comment,
588 };
589
590 static void conf_write_symbol(FILE *fp, struct symbol *sym,
591                               struct conf_printer *printer, void *printer_arg)
592 {
593         const char *str;
594
595         switch (sym->type) {
596         case S_OTHER:
597         case S_UNKNOWN:
598                 break;
599         case S_STRING:
600                 str = sym_get_string_value(sym);
601                 str = sym_escape_string_value(str);
602                 printer->print_symbol(fp, sym, str, printer_arg);
603                 free((void *)str);
604                 break;
605         default:
606                 str = sym_get_string_value(sym);
607                 printer->print_symbol(fp, sym, str, printer_arg);
608         }
609 }
610
611 static void
612 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
613 {
614         char buf[256];
615
616         snprintf(buf, sizeof(buf),
617             "\n"
618             "Automatically generated file; DO NOT EDIT.\n"
619             "%s\n",
620             rootmenu.prompt->text);
621
622         printer->print_comment(fp, buf, printer_arg);
623 }
624
625 /*
626  * Write out a minimal config.
627  * All values that has default values are skipped as this is redundant.
628  */
629 int conf_write_defconfig(const char *filename)
630 {
631         struct symbol *sym;
632         struct menu *menu;
633         FILE *out;
634
635         out = fopen(filename, "w");
636         if (!out)
637                 return 1;
638
639         sym_clear_all_valid();
640
641         /* Traverse all menus to find all relevant symbols */
642         menu = rootmenu.list;
643
644         while (menu != NULL)
645         {
646                 sym = menu->sym;
647                 if (sym == NULL) {
648                         if (!menu_is_visible(menu))
649                                 goto next_menu;
650                 } else if (!sym_is_choice(sym)) {
651                         sym_calc_value(sym);
652                         if (!(sym->flags & SYMBOL_WRITE))
653                                 goto next_menu;
654                         sym->flags &= ~SYMBOL_WRITE;
655                         /* If we cannot change the symbol - skip */
656                         if (!sym_is_changable(sym))
657                                 goto next_menu;
658                         /* If symbol equals to default value - skip */
659                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
660                                 goto next_menu;
661
662                         /*
663                          * If symbol is a choice value and equals to the
664                          * default for a choice - skip.
665                          * But only if value is bool and equal to "y" and
666                          * choice is not "optional".
667                          * (If choice is "optional" then all values can be "n")
668                          */
669                         if (sym_is_choice_value(sym)) {
670                                 struct symbol *cs;
671                                 struct symbol *ds;
672
673                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
674                                 ds = sym_choice_default(cs);
675                                 if (!sym_is_optional(cs) && sym == ds) {
676                                         if ((sym->type == S_BOOLEAN) &&
677                                             sym_get_tristate_value(sym) == yes)
678                                                 goto next_menu;
679                                 }
680                         }
681                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
682                 }
683 next_menu:
684                 if (menu->list != NULL) {
685                         menu = menu->list;
686                 }
687                 else if (menu->next != NULL) {
688                         menu = menu->next;
689                 } else {
690                         while ((menu = menu->parent)) {
691                                 if (menu->next != NULL) {
692                                         menu = menu->next;
693                                         break;
694                                 }
695                         }
696                 }
697         }
698         fclose(out);
699         return 0;
700 }
701
702 int conf_write(const char *name)
703 {
704         FILE *out;
705         struct symbol *sym;
706         struct menu *menu;
707         const char *basename;
708         const char *str;
709         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
710         char *env;
711
712         dirname[0] = 0;
713         if (name && name[0]) {
714                 struct stat st;
715                 char *slash;
716
717                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
718                         strcpy(dirname, name);
719                         strcat(dirname, "/");
720                         basename = conf_get_configname();
721                 } else if ((slash = strrchr(name, '/'))) {
722                         int size = slash - name + 1;
723                         memcpy(dirname, name, size);
724                         dirname[size] = 0;
725                         if (slash[1])
726                                 basename = slash + 1;
727                         else
728                                 basename = conf_get_configname();
729                 } else
730                         basename = name;
731         } else
732                 basename = conf_get_configname();
733
734         sprintf(newname, "%s%s", dirname, basename);
735         env = getenv("KCONFIG_OVERWRITECONFIG");
736         if (!env || !*env) {
737                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
738                 out = fopen(tmpname, "w");
739         } else {
740                 *tmpname = 0;
741                 out = fopen(newname, "w");
742         }
743         if (!out)
744                 return 1;
745
746         conf_write_heading(out, &kconfig_printer_cb, NULL);
747
748         if (!conf_get_changed())
749                 sym_clear_all_valid();
750
751         menu = rootmenu.list;
752         while (menu) {
753                 sym = menu->sym;
754                 if (!sym) {
755                         if (!menu_is_visible(menu))
756                                 goto next;
757                         str = menu_get_prompt(menu);
758                         fprintf(out, "\n"
759                                      "#\n"
760                                      "# %s\n"
761                                      "#\n", str);
762                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
763                         sym_calc_value(sym);
764                         if (!(sym->flags & SYMBOL_WRITE))
765                                 goto next;
766                         sym->flags &= ~SYMBOL_WRITE;
767
768                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
769                 }
770
771 next:
772                 if (menu->list) {
773                         menu = menu->list;
774                         continue;
775                 }
776                 if (menu->next)
777                         menu = menu->next;
778                 else while ((menu = menu->parent)) {
779                         if (menu->next) {
780                                 menu = menu->next;
781                                 break;
782                         }
783                 }
784         }
785         fclose(out);
786
787         if (*tmpname) {
788                 strcat(dirname, basename);
789                 strcat(dirname, ".old");
790                 rename(newname, dirname);
791                 if (rename(tmpname, newname))
792                         return 1;
793         }
794
795         conf_message(_("configuration written to %s"), newname);
796
797         sym_set_change_count(0);
798
799         return 0;
800 }
801
802 static int conf_split_config(void)
803 {
804         const char *name;
805         char path[PATH_MAX+1];
806         char *s, *d, c;
807         struct symbol *sym;
808         struct stat sb;
809         int res, i, fd;
810
811         name = conf_get_autoconfig_name();
812         conf_read_simple(name, S_DEF_AUTO);
813
814         if (chdir("include/config"))
815                 return 1;
816
817         res = 0;
818         for_all_symbols(i, sym) {
819                 sym_calc_value(sym);
820                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
821                         continue;
822                 if (sym->flags & SYMBOL_WRITE) {
823                         if (sym->flags & SYMBOL_DEF_AUTO) {
824                                 /*
825                                  * symbol has old and new value,
826                                  * so compare them...
827                                  */
828                                 switch (sym->type) {
829                                 case S_BOOLEAN:
830                                 case S_TRISTATE:
831                                         if (sym_get_tristate_value(sym) ==
832                                             sym->def[S_DEF_AUTO].tri)
833                                                 continue;
834                                         break;
835                                 case S_STRING:
836                                 case S_HEX:
837                                 case S_INT:
838                                         if (!strcmp(sym_get_string_value(sym),
839                                                     sym->def[S_DEF_AUTO].val))
840                                                 continue;
841                                         break;
842                                 default:
843                                         break;
844                                 }
845                         } else {
846                                 /*
847                                  * If there is no old value, only 'no' (unset)
848                                  * is allowed as new value.
849                                  */
850                                 switch (sym->type) {
851                                 case S_BOOLEAN:
852                                 case S_TRISTATE:
853                                         if (sym_get_tristate_value(sym) == no)
854                                                 continue;
855                                         break;
856                                 default:
857                                         break;
858                                 }
859                         }
860                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
861                         /* There is neither an old nor a new value. */
862                         continue;
863                 /* else
864                  *      There is an old value, but no new value ('no' (unset)
865                  *      isn't saved in auto.conf, so the old value is always
866                  *      different from 'no').
867                  */
868
869                 /* Replace all '_' and append ".h" */
870                 s = sym->name;
871                 d = path;
872                 while ((c = *s++)) {
873                         c = tolower(c);
874                         *d++ = (c == '_') ? '/' : c;
875                 }
876                 strcpy(d, ".h");
877
878                 /* Assume directory path already exists. */
879                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
880                 if (fd == -1) {
881                         if (errno != ENOENT) {
882                                 res = 1;
883                                 break;
884                         }
885                         /*
886                          * Create directory components,
887                          * unless they exist already.
888                          */
889                         d = path;
890                         while ((d = strchr(d, '/'))) {
891                                 *d = 0;
892                                 if (stat(path, &sb) && mkdir(path, 0755)) {
893                                         res = 1;
894                                         goto out;
895                                 }
896                                 *d++ = '/';
897                         }
898                         /* Try it again. */
899                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
900                         if (fd == -1) {
901                                 res = 1;
902                                 break;
903                         }
904                 }
905                 close(fd);
906         }
907 out:
908         if (chdir("../.."))
909                 return 1;
910
911         return res;
912 }
913
914 int conf_write_autoconf(void)
915 {
916         struct symbol *sym;
917         const char *name;
918         FILE *out, *tristate, *out_h;
919         int i;
920
921         sym_clear_all_valid();
922
923         file_write_dep("include/config/auto.conf.cmd");
924
925         if (conf_split_config())
926                 return 1;
927
928         out = fopen(".tmpconfig", "w");
929         if (!out)
930                 return 1;
931
932         tristate = fopen(".tmpconfig_tristate", "w");
933         if (!tristate) {
934                 fclose(out);
935                 return 1;
936         }
937
938         out_h = fopen(".tmpconfig.h", "w");
939         if (!out_h) {
940                 fclose(out);
941                 fclose(tristate);
942                 return 1;
943         }
944
945         conf_write_heading(out, &kconfig_printer_cb, NULL);
946
947         conf_write_heading(tristate, &tristate_printer_cb, NULL);
948
949         conf_write_heading(out_h, &header_printer_cb, NULL);
950
951         for_all_symbols(i, sym) {
952                 if (!sym->name)
953                         continue;
954
955                 sym_calc_value(sym);
956
957                 conf_write_symbol(out_h, sym, &header__enabled_printer_cb, NULL);
958
959                 if (!(sym->flags & SYMBOL_WRITE))
960                         continue;
961
962                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
963
964                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
965
966                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
967         }
968         fclose(out);
969         fclose(tristate);
970         fclose(out_h);
971
972         name = getenv("KCONFIG_AUTOHEADER");
973         if (!name)
974                 name = "include/generated/autoconf.h";
975         if (rename(".tmpconfig.h", name))
976                 return 1;
977         name = getenv("KCONFIG_TRISTATE");
978         if (!name)
979                 name = "include/config/tristate.conf";
980         if (rename(".tmpconfig_tristate", name))
981                 return 1;
982         name = conf_get_autoconfig_name();
983         /*
984          * This must be the last step, kbuild has a dependency on auto.conf
985          * and this marks the successful completion of the previous steps.
986          */
987         if (rename(".tmpconfig", name))
988                 return 1;
989
990         return 0;
991 }
992
993 static int sym_change_count;
994 static void (*conf_changed_callback)(void);
995
996 void sym_set_change_count(int count)
997 {
998         int _sym_change_count = sym_change_count;
999         sym_change_count = count;
1000         if (conf_changed_callback &&
1001             (bool)_sym_change_count != (bool)count)
1002                 conf_changed_callback();
1003 }
1004
1005 void sym_add_change_count(int count)
1006 {
1007         sym_set_change_count(count + sym_change_count);
1008 }
1009
1010 bool conf_get_changed(void)
1011 {
1012         return sym_change_count;
1013 }
1014
1015 void conf_set_changed_callback(void (*fn)(void))
1016 {
1017         conf_changed_callback = fn;
1018 }
1019
1020 static void randomize_choice_values(struct symbol *csym)
1021 {
1022         struct property *prop;
1023         struct symbol *sym;
1024         struct expr *e;
1025         int cnt, def;
1026
1027         /*
1028          * If choice is mod then we may have more items selected
1029          * and if no then no-one.
1030          * In both cases stop.
1031          */
1032         if (csym->curr.tri != yes)
1033                 return;
1034
1035         prop = sym_get_choice_prop(csym);
1036
1037         /* count entries in choice block */
1038         cnt = 0;
1039         expr_list_for_each_sym(prop->expr, e, sym)
1040                 cnt++;
1041
1042         /*
1043          * find a random value and set it to yes,
1044          * set the rest to no so we have only one set
1045          */
1046         def = (rand() % cnt);
1047
1048         cnt = 0;
1049         expr_list_for_each_sym(prop->expr, e, sym) {
1050                 if (def == cnt++) {
1051                         sym->def[S_DEF_USER].tri = yes;
1052                         csym->def[S_DEF_USER].val = sym;
1053                 }
1054                 else {
1055                         sym->def[S_DEF_USER].tri = no;
1056                 }
1057         }
1058         csym->flags |= SYMBOL_DEF_USER;
1059         /* clear VALID to get value calculated */
1060         csym->flags &= ~(SYMBOL_VALID);
1061 }
1062
1063 static void set_all_choice_values(struct symbol *csym)
1064 {
1065         struct property *prop;
1066         struct symbol *sym;
1067         struct expr *e;
1068
1069         prop = sym_get_choice_prop(csym);
1070
1071         /*
1072          * Set all non-assinged choice values to no
1073          */
1074         expr_list_for_each_sym(prop->expr, e, sym) {
1075                 if (!sym_has_value(sym))
1076                         sym->def[S_DEF_USER].tri = no;
1077         }
1078         csym->flags |= SYMBOL_DEF_USER;
1079         /* clear VALID to get value calculated */
1080         csym->flags &= ~(SYMBOL_VALID);
1081 }
1082
1083 void conf_set_all_new_symbols(enum conf_def_mode mode)
1084 {
1085         struct symbol *sym, *csym;
1086         int i, cnt;
1087
1088         for_all_symbols(i, sym) {
1089                 if (sym_has_value(sym))
1090                         continue;
1091                 switch (sym_get_type(sym)) {
1092                 case S_BOOLEAN:
1093                 case S_TRISTATE:
1094                         switch (mode) {
1095                         case def_yes:
1096                                 sym->def[S_DEF_USER].tri = yes;
1097                                 break;
1098                         case def_mod:
1099                                 sym->def[S_DEF_USER].tri = mod;
1100                                 break;
1101                         case def_no:
1102                                 sym->def[S_DEF_USER].tri = no;
1103                                 break;
1104                         case def_random:
1105                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1106                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1107                                 break;
1108                         default:
1109                                 continue;
1110                         }
1111                         if (!(sym_is_choice(sym) && mode == def_random))
1112                                 sym->flags |= SYMBOL_DEF_USER;
1113                         break;
1114                 default:
1115                         break;
1116                 }
1117
1118         }
1119
1120         sym_clear_all_valid();
1121
1122         /*
1123          * We have different type of choice blocks.
1124          * If curr.tri equals to mod then we can select several
1125          * choice symbols in one block.
1126          * In this case we do nothing.
1127          * If curr.tri equals yes then only one symbol can be
1128          * selected in a choice block and we set it to yes,
1129          * and the rest to no.
1130          */
1131         for_all_symbols(i, csym) {
1132                 if (sym_has_value(csym) || !sym_is_choice(csym))
1133                         continue;
1134
1135                 sym_calc_value(csym);
1136                 if (mode == def_random)
1137                         randomize_choice_values(csym);
1138                 else
1139                         set_all_choice_values(csym);
1140         }
1141 }