kconfig/gconf: kill deadcode
[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, *choice_sym;
348         struct property *prop;
349         struct expr *e;
350         int i, flags;
351
352         sym_set_change_count(0);
353
354         if (conf_read_simple(name, S_DEF_USER))
355                 return 1;
356
357         for_all_symbols(i, sym) {
358                 sym_calc_value(sym);
359                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
360                         goto sym_ok;
361                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
362                         /* check that calculated value agrees with saved value */
363                         switch (sym->type) {
364                         case S_BOOLEAN:
365                         case S_TRISTATE:
366                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
367                                         break;
368                                 if (!sym_is_choice(sym))
369                                         goto sym_ok;
370                                 /* fall through */
371                         default:
372                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
373                                         goto sym_ok;
374                                 break;
375                         }
376                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
377                         /* no previous value and not saved */
378                         goto sym_ok;
379                 conf_unsaved++;
380                 /* maybe print value in verbose mode... */
381         sym_ok:
382                 if (!sym_is_choice(sym))
383                         continue;
384                 /* The choice symbol only has a set value (and thus is not new)
385                  * if all its visible childs have values.
386                  */
387                 prop = sym_get_choice_prop(sym);
388                 flags = sym->flags;
389                 expr_list_for_each_sym(prop->expr, e, choice_sym)
390                         if (choice_sym->visible != no)
391                                 flags &= choice_sym->flags;
392                 sym->flags &= flags | ~SYMBOL_DEF_USER;
393         }
394
395         for_all_symbols(i, sym) {
396                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
397                         /* Reset values of generates values, so they'll appear
398                          * as new, if they should become visible, but that
399                          * doesn't quite work if the Kconfig and the saved
400                          * configuration disagree.
401                          */
402                         if (sym->visible == no && !conf_unsaved)
403                                 sym->flags &= ~SYMBOL_DEF_USER;
404                         switch (sym->type) {
405                         case S_STRING:
406                         case S_INT:
407                         case S_HEX:
408                                 /* Reset a string value if it's out of range */
409                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
410                                         break;
411                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
412                                 conf_unsaved++;
413                                 break;
414                         default:
415                                 break;
416                         }
417                 }
418         }
419
420         sym_add_change_count(conf_warnings || conf_unsaved);
421
422         return 0;
423 }
424
425 /* Write a S_STRING */
426 static void conf_write_string(bool headerfile, const char *name,
427                               const char *str, FILE *out)
428 {
429         int l;
430         if (headerfile)
431                 fprintf(out, "#define %s%s \"", CONFIG_, name);
432         else
433                 fprintf(out, "%s%s=\"", CONFIG_, name);
434
435         while (1) {
436                 l = strcspn(str, "\"\\");
437                 if (l) {
438                         xfwrite(str, l, 1, out);
439                         str += l;
440                 }
441                 if (!*str)
442                         break;
443                 fprintf(out, "\\%c", *str++);
444         }
445         fputs("\"\n", out);
446 }
447
448 static void conf_write_symbol(struct symbol *sym, FILE *out, bool write_no)
449 {
450         const char *str;
451
452         switch (sym->type) {
453         case S_BOOLEAN:
454         case S_TRISTATE:
455                 switch (sym_get_tristate_value(sym)) {
456                 case no:
457                         if (write_no)
458                                 fprintf(out, "# %s%s is not set\n",
459                                     CONFIG_, sym->name);
460                         break;
461                 case mod:
462                         fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
463                         break;
464                 case yes:
465                         fprintf(out, "%s%s=y\n", CONFIG_, sym->name);
466                         break;
467                 }
468                 break;
469         case S_STRING:
470                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
471                 break;
472         case S_HEX:
473         case S_INT:
474                 str = sym_get_string_value(sym);
475                 fprintf(out, "%s%s=%s\n", CONFIG_, sym->name, str);
476                 break;
477         case S_OTHER:
478         case S_UNKNOWN:
479                 break;
480         }
481 }
482
483 /*
484  * Write out a minimal config.
485  * All values that has default values are skipped as this is redundant.
486  */
487 int conf_write_defconfig(const char *filename)
488 {
489         struct symbol *sym;
490         struct menu *menu;
491         FILE *out;
492
493         out = fopen(filename, "w");
494         if (!out)
495                 return 1;
496
497         sym_clear_all_valid();
498
499         /* Traverse all menus to find all relevant symbols */
500         menu = rootmenu.list;
501
502         while (menu != NULL)
503         {
504                 sym = menu->sym;
505                 if (sym == NULL) {
506                         if (!menu_is_visible(menu))
507                                 goto next_menu;
508                 } else if (!sym_is_choice(sym)) {
509                         sym_calc_value(sym);
510                         if (!(sym->flags & SYMBOL_WRITE))
511                                 goto next_menu;
512                         sym->flags &= ~SYMBOL_WRITE;
513                         /* If we cannot change the symbol - skip */
514                         if (!sym_is_changable(sym))
515                                 goto next_menu;
516                         /* If symbol equals to default value - skip */
517                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
518                                 goto next_menu;
519
520                         /*
521                          * If symbol is a choice value and equals to the
522                          * default for a choice - skip.
523                          * But only if value is bool and equal to "y" and
524                          * choice is not "optional".
525                          * (If choice is "optional" then all values can be "n")
526                          */
527                         if (sym_is_choice_value(sym)) {
528                                 struct symbol *cs;
529                                 struct symbol *ds;
530
531                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
532                                 ds = sym_choice_default(cs);
533                                 if (!sym_is_optional(cs) && sym == ds) {
534                                         if ((sym->type == S_BOOLEAN) &&
535                                             sym_get_tristate_value(sym) == yes)
536                                                 goto next_menu;
537                                 }
538                         }
539                         conf_write_symbol(sym, out, true);
540                 }
541 next_menu:
542                 if (menu->list != NULL) {
543                         menu = menu->list;
544                 }
545                 else if (menu->next != NULL) {
546                         menu = menu->next;
547                 } else {
548                         while ((menu = menu->parent)) {
549                                 if (menu->next != NULL) {
550                                         menu = menu->next;
551                                         break;
552                                 }
553                         }
554                 }
555         }
556         fclose(out);
557         return 0;
558 }
559
560 int conf_write(const char *name)
561 {
562         FILE *out;
563         struct symbol *sym;
564         struct menu *menu;
565         const char *basename;
566         const char *str;
567         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
568         char *env;
569
570         dirname[0] = 0;
571         if (name && name[0]) {
572                 struct stat st;
573                 char *slash;
574
575                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
576                         strcpy(dirname, name);
577                         strcat(dirname, "/");
578                         basename = conf_get_configname();
579                 } else if ((slash = strrchr(name, '/'))) {
580                         int size = slash - name + 1;
581                         memcpy(dirname, name, size);
582                         dirname[size] = 0;
583                         if (slash[1])
584                                 basename = slash + 1;
585                         else
586                                 basename = conf_get_configname();
587                 } else
588                         basename = name;
589         } else
590                 basename = conf_get_configname();
591
592         sprintf(newname, "%s%s", dirname, basename);
593         env = getenv("KCONFIG_OVERWRITECONFIG");
594         if (!env || !*env) {
595                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
596                 out = fopen(tmpname, "w");
597         } else {
598                 *tmpname = 0;
599                 out = fopen(newname, "w");
600         }
601         if (!out)
602                 return 1;
603
604         fprintf(out, _("#\n"
605                        "# Automatically generated make config: don't edit\n"
606                        "# %s\n"
607                        "#\n"),
608                      rootmenu.prompt->text);
609
610         if (!conf_get_changed())
611                 sym_clear_all_valid();
612
613         menu = rootmenu.list;
614         while (menu) {
615                 sym = menu->sym;
616                 if (!sym) {
617                         if (!menu_is_visible(menu))
618                                 goto next;
619                         str = menu_get_prompt(menu);
620                         fprintf(out, "\n"
621                                      "#\n"
622                                      "# %s\n"
623                                      "#\n", str);
624                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
625                         sym_calc_value(sym);
626                         if (!(sym->flags & SYMBOL_WRITE))
627                                 goto next;
628                         sym->flags &= ~SYMBOL_WRITE;
629                         /* Write config symbol to file */
630                         conf_write_symbol(sym, out, true);
631                 }
632
633 next:
634                 if (menu->list) {
635                         menu = menu->list;
636                         continue;
637                 }
638                 if (menu->next)
639                         menu = menu->next;
640                 else while ((menu = menu->parent)) {
641                         if (menu->next) {
642                                 menu = menu->next;
643                                 break;
644                         }
645                 }
646         }
647         fclose(out);
648
649         if (*tmpname) {
650                 strcat(dirname, basename);
651                 strcat(dirname, ".old");
652                 rename(newname, dirname);
653                 if (rename(tmpname, newname))
654                         return 1;
655         }
656
657         conf_message(_("configuration written to %s"), newname);
658
659         sym_set_change_count(0);
660
661         return 0;
662 }
663
664 static int conf_split_config(void)
665 {
666         const char *name;
667         char path[PATH_MAX+1];
668         char *s, *d, c;
669         struct symbol *sym;
670         struct stat sb;
671         int res, i, fd;
672
673         name = conf_get_autoconfig_name();
674         conf_read_simple(name, S_DEF_AUTO);
675
676         if (chdir("include/config"))
677                 return 1;
678
679         res = 0;
680         for_all_symbols(i, sym) {
681                 sym_calc_value(sym);
682                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
683                         continue;
684                 if (sym->flags & SYMBOL_WRITE) {
685                         if (sym->flags & SYMBOL_DEF_AUTO) {
686                                 /*
687                                  * symbol has old and new value,
688                                  * so compare them...
689                                  */
690                                 switch (sym->type) {
691                                 case S_BOOLEAN:
692                                 case S_TRISTATE:
693                                         if (sym_get_tristate_value(sym) ==
694                                             sym->def[S_DEF_AUTO].tri)
695                                                 continue;
696                                         break;
697                                 case S_STRING:
698                                 case S_HEX:
699                                 case S_INT:
700                                         if (!strcmp(sym_get_string_value(sym),
701                                                     sym->def[S_DEF_AUTO].val))
702                                                 continue;
703                                         break;
704                                 default:
705                                         break;
706                                 }
707                         } else {
708                                 /*
709                                  * If there is no old value, only 'no' (unset)
710                                  * is allowed as new value.
711                                  */
712                                 switch (sym->type) {
713                                 case S_BOOLEAN:
714                                 case S_TRISTATE:
715                                         if (sym_get_tristate_value(sym) == no)
716                                                 continue;
717                                         break;
718                                 default:
719                                         break;
720                                 }
721                         }
722                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
723                         /* There is neither an old nor a new value. */
724                         continue;
725                 /* else
726                  *      There is an old value, but no new value ('no' (unset)
727                  *      isn't saved in auto.conf, so the old value is always
728                  *      different from 'no').
729                  */
730
731                 /* Replace all '_' and append ".h" */
732                 s = sym->name;
733                 d = path;
734                 while ((c = *s++)) {
735                         c = tolower(c);
736                         *d++ = (c == '_') ? '/' : c;
737                 }
738                 strcpy(d, ".h");
739
740                 /* Assume directory path already exists. */
741                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
742                 if (fd == -1) {
743                         if (errno != ENOENT) {
744                                 res = 1;
745                                 break;
746                         }
747                         /*
748                          * Create directory components,
749                          * unless they exist already.
750                          */
751                         d = path;
752                         while ((d = strchr(d, '/'))) {
753                                 *d = 0;
754                                 if (stat(path, &sb) && mkdir(path, 0755)) {
755                                         res = 1;
756                                         goto out;
757                                 }
758                                 *d++ = '/';
759                         }
760                         /* Try it again. */
761                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
762                         if (fd == -1) {
763                                 res = 1;
764                                 break;
765                         }
766                 }
767                 close(fd);
768         }
769 out:
770         if (chdir("../.."))
771                 return 1;
772
773         return res;
774 }
775
776 int conf_write_autoconf(void)
777 {
778         struct symbol *sym;
779         const char *str;
780         const char *name;
781         FILE *out, *tristate, *out_h;
782         int i;
783
784         sym_clear_all_valid();
785
786         file_write_dep("include/config/auto.conf.cmd");
787
788         if (conf_split_config())
789                 return 1;
790
791         out = fopen(".tmpconfig", "w");
792         if (!out)
793                 return 1;
794
795         tristate = fopen(".tmpconfig_tristate", "w");
796         if (!tristate) {
797                 fclose(out);
798                 return 1;
799         }
800
801         out_h = fopen(".tmpconfig.h", "w");
802         if (!out_h) {
803                 fclose(out);
804                 fclose(tristate);
805                 return 1;
806         }
807
808         fprintf(out, "#\n"
809                      "# Automatically generated make config: don't edit\n"
810                      "# %s\n"
811                      "#\n",
812                      rootmenu.prompt->text);
813         fprintf(tristate, "#\n"
814                           "# Automatically generated - do not edit\n"
815                           "\n");
816         fprintf(out_h, "/*\n"
817                        " * Automatically generated C config: don't edit\n"
818                        " * %s\n"
819                        " */\n",
820                        rootmenu.prompt->text);
821
822         for_all_symbols(i, sym) {
823                 sym_calc_value(sym);
824                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
825                         continue;
826
827                 /* write symbol to config file */
828                 conf_write_symbol(sym, out, false);
829
830                 /* update autoconf and tristate files */
831                 switch (sym->type) {
832                 case S_BOOLEAN:
833                 case S_TRISTATE:
834                         switch (sym_get_tristate_value(sym)) {
835                         case no:
836                                 break;
837                         case mod:
838                                 fprintf(tristate, "%s%s=M\n",
839                                     CONFIG_, sym->name);
840                                 fprintf(out_h, "#define %s%s_MODULE 1\n",
841                                     CONFIG_, sym->name);
842                                 break;
843                         case yes:
844                                 if (sym->type == S_TRISTATE)
845                                         fprintf(tristate,"%s%s=Y\n",
846                                             CONFIG_, sym->name);
847                                 fprintf(out_h, "#define %s%s 1\n",
848                                     CONFIG_, sym->name);
849                                 break;
850                         }
851                         break;
852                 case S_STRING:
853                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
854                         break;
855                 case S_HEX:
856                         str = sym_get_string_value(sym);
857                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
858                                 fprintf(out_h, "#define %s%s 0x%s\n",
859                                     CONFIG_, sym->name, str);
860                                 break;
861                         }
862                 case S_INT:
863                         str = sym_get_string_value(sym);
864                         fprintf(out_h, "#define %s%s %s\n",
865                             CONFIG_, sym->name, str);
866                         break;
867                 default:
868                         break;
869                 }
870         }
871         fclose(out);
872         fclose(tristate);
873         fclose(out_h);
874
875         name = getenv("KCONFIG_AUTOHEADER");
876         if (!name)
877                 name = "include/generated/autoconf.h";
878         if (rename(".tmpconfig.h", name))
879                 return 1;
880         name = getenv("KCONFIG_TRISTATE");
881         if (!name)
882                 name = "include/config/tristate.conf";
883         if (rename(".tmpconfig_tristate", name))
884                 return 1;
885         name = conf_get_autoconfig_name();
886         /*
887          * This must be the last step, kbuild has a dependency on auto.conf
888          * and this marks the successful completion of the previous steps.
889          */
890         if (rename(".tmpconfig", name))
891                 return 1;
892
893         return 0;
894 }
895
896 static int sym_change_count;
897 static void (*conf_changed_callback)(void);
898
899 void sym_set_change_count(int count)
900 {
901         int _sym_change_count = sym_change_count;
902         sym_change_count = count;
903         if (conf_changed_callback &&
904             (bool)_sym_change_count != (bool)count)
905                 conf_changed_callback();
906 }
907
908 void sym_add_change_count(int count)
909 {
910         sym_set_change_count(count + sym_change_count);
911 }
912
913 bool conf_get_changed(void)
914 {
915         return sym_change_count;
916 }
917
918 void conf_set_changed_callback(void (*fn)(void))
919 {
920         conf_changed_callback = fn;
921 }
922
923 static void randomize_choice_values(struct symbol *csym)
924 {
925         struct property *prop;
926         struct symbol *sym;
927         struct expr *e;
928         int cnt, def;
929
930         /*
931          * If choice is mod then we may have more items selected
932          * and if no then no-one.
933          * In both cases stop.
934          */
935         if (csym->curr.tri != yes)
936                 return;
937
938         prop = sym_get_choice_prop(csym);
939
940         /* count entries in choice block */
941         cnt = 0;
942         expr_list_for_each_sym(prop->expr, e, sym)
943                 cnt++;
944
945         /*
946          * find a random value and set it to yes,
947          * set the rest to no so we have only one set
948          */
949         def = (rand() % cnt);
950
951         cnt = 0;
952         expr_list_for_each_sym(prop->expr, e, sym) {
953                 if (def == cnt++) {
954                         sym->def[S_DEF_USER].tri = yes;
955                         csym->def[S_DEF_USER].val = sym;
956                 }
957                 else {
958                         sym->def[S_DEF_USER].tri = no;
959                 }
960         }
961         csym->flags |= SYMBOL_DEF_USER;
962         /* clear VALID to get value calculated */
963         csym->flags &= ~(SYMBOL_VALID);
964 }
965
966 static void set_all_choice_values(struct symbol *csym)
967 {
968         struct property *prop;
969         struct symbol *sym;
970         struct expr *e;
971
972         prop = sym_get_choice_prop(csym);
973
974         /*
975          * Set all non-assinged choice values to no
976          */
977         expr_list_for_each_sym(prop->expr, e, sym) {
978                 if (!sym_has_value(sym))
979                         sym->def[S_DEF_USER].tri = no;
980         }
981         csym->flags |= SYMBOL_DEF_USER;
982         /* clear VALID to get value calculated */
983         csym->flags &= ~(SYMBOL_VALID);
984 }
985
986 void conf_set_all_new_symbols(enum conf_def_mode mode)
987 {
988         struct symbol *sym, *csym;
989         int i, cnt;
990
991         for_all_symbols(i, sym) {
992                 if (sym_has_value(sym))
993                         continue;
994                 switch (sym_get_type(sym)) {
995                 case S_BOOLEAN:
996                 case S_TRISTATE:
997                         switch (mode) {
998                         case def_yes:
999                                 sym->def[S_DEF_USER].tri = yes;
1000                                 break;
1001                         case def_mod:
1002                                 sym->def[S_DEF_USER].tri = mod;
1003                                 break;
1004                         case def_no:
1005                                 sym->def[S_DEF_USER].tri = no;
1006                                 break;
1007                         case def_random:
1008                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1009                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1010                                 break;
1011                         default:
1012                                 continue;
1013                         }
1014                         if (!(sym_is_choice(sym) && mode == def_random))
1015                                 sym->flags |= SYMBOL_DEF_USER;
1016                         break;
1017                 default:
1018                         break;
1019                 }
1020
1021         }
1022
1023         sym_clear_all_valid();
1024
1025         /*
1026          * We have different type of choice blocks.
1027          * If curr.tri equals to mod then we can select several
1028          * choice symbols in one block.
1029          * In this case we do nothing.
1030          * If curr.tri equals yes then only one symbol can be
1031          * selected in a choice block and we set it to yes,
1032          * and the rest to no.
1033          */
1034         for_all_symbols(i, csym) {
1035                 if (sym_has_value(csym) || !sym_is_choice(csym))
1036                         continue;
1037
1038                 sym_calc_value(csym);
1039                 if (mode == def_random)
1040                         randomize_choice_values(csym);
1041                 else
1042                         set_all_choice_values(csym);
1043         }
1044 }