kconfig: fix savedefconfig with choice marked optional
[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 <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <time.h>
13 #include <unistd.h>
14
15 #define LKC_DIRECT_LINK
16 #include "lkc.h"
17
18 static void conf_warning(const char *fmt, ...)
19         __attribute__ ((format (printf, 1, 2)));
20
21 static const char *conf_filename;
22 static int conf_lineno, conf_warnings, conf_unsaved;
23
24 const char conf_defname[] = "arch/$ARCH/defconfig";
25
26 static void conf_warning(const char *fmt, ...)
27 {
28         va_list ap;
29         va_start(ap, fmt);
30         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
31         vfprintf(stderr, fmt, ap);
32         fprintf(stderr, "\n");
33         va_end(ap);
34         conf_warnings++;
35 }
36
37 const char *conf_get_configname(void)
38 {
39         char *name = getenv("KCONFIG_CONFIG");
40
41         return name ? name : ".config";
42 }
43
44 const char *conf_get_autoconfig_name(void)
45 {
46         char *name = getenv("KCONFIG_AUTOCONFIG");
47
48         return name ? name : "include/config/auto.conf";
49 }
50
51 static char *conf_expand_value(const char *in)
52 {
53         struct symbol *sym;
54         const char *src;
55         static char res_value[SYMBOL_MAXLENGTH];
56         char *dst, name[SYMBOL_MAXLENGTH];
57
58         res_value[0] = 0;
59         dst = name;
60         while ((src = strchr(in, '$'))) {
61                 strncat(res_value, in, src - in);
62                 src++;
63                 dst = name;
64                 while (isalnum(*src) || *src == '_')
65                         *dst++ = *src++;
66                 *dst = 0;
67                 sym = sym_lookup(name, 0);
68                 sym_calc_value(sym);
69                 strcat(res_value, sym_get_string_value(sym));
70                 in = src;
71         }
72         strcat(res_value, in);
73
74         return res_value;
75 }
76
77 char *conf_get_default_confname(void)
78 {
79         struct stat buf;
80         static char fullname[PATH_MAX+1];
81         char *env, *name;
82
83         name = conf_expand_value(conf_defname);
84         env = getenv(SRCTREE);
85         if (env) {
86                 sprintf(fullname, "%s/%s", env, name);
87                 if (!stat(fullname, &buf))
88                         return fullname;
89         }
90         return name;
91 }
92
93 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
94 {
95         char *p2;
96
97         switch (sym->type) {
98         case S_TRISTATE:
99                 if (p[0] == 'm') {
100                         sym->def[def].tri = mod;
101                         sym->flags |= def_flags;
102                         break;
103                 }
104         case S_BOOLEAN:
105                 if (p[0] == 'y') {
106                         sym->def[def].tri = yes;
107                         sym->flags |= def_flags;
108                         break;
109                 }
110                 if (p[0] == 'n') {
111                         sym->def[def].tri = no;
112                         sym->flags |= def_flags;
113                         break;
114                 }
115                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
116                 break;
117         case S_OTHER:
118                 if (*p != '"') {
119                         for (p2 = p; *p2 && !isspace(*p2); p2++)
120                                 ;
121                         sym->type = S_STRING;
122                         goto done;
123                 }
124         case S_STRING:
125                 if (*p++ != '"')
126                         break;
127                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
128                         if (*p2 == '"') {
129                                 *p2 = 0;
130                                 break;
131                         }
132                         memmove(p2, p2 + 1, strlen(p2));
133                 }
134                 if (!p2) {
135                         conf_warning("invalid string found");
136                         return 1;
137                 }
138         case S_INT:
139         case S_HEX:
140         done:
141                 if (sym_string_valid(sym, p)) {
142                         sym->def[def].val = strdup(p);
143                         sym->flags |= def_flags;
144                 } else {
145                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
146                         return 1;
147                 }
148                 break;
149         default:
150                 ;
151         }
152         return 0;
153 }
154
155 int conf_read_simple(const char *name, int def)
156 {
157         FILE *in = NULL;
158         char line[1024];
159         char *p, *p2;
160         struct symbol *sym;
161         int i, def_flags;
162
163         if (name) {
164                 in = zconf_fopen(name);
165         } else {
166                 struct property *prop;
167
168                 name = conf_get_configname();
169                 in = zconf_fopen(name);
170                 if (in)
171                         goto load;
172                 sym_add_change_count(1);
173                 if (!sym_defconfig_list) {
174                         if (modules_sym)
175                                 sym_calc_value(modules_sym);
176                         return 1;
177                 }
178
179                 for_all_defaults(sym_defconfig_list, prop) {
180                         if (expr_calc_value(prop->visible.expr) == no ||
181                             prop->expr->type != E_SYMBOL)
182                                 continue;
183                         name = conf_expand_value(prop->expr->left.sym->name);
184                         in = zconf_fopen(name);
185                         if (in) {
186                                 printf(_("#\n"
187                                          "# using defaults found in %s\n"
188                                          "#\n"), name);
189                                 goto load;
190                         }
191                 }
192         }
193         if (!in)
194                 return 1;
195
196 load:
197         conf_filename = name;
198         conf_lineno = 0;
199         conf_warnings = 0;
200         conf_unsaved = 0;
201
202         def_flags = SYMBOL_DEF << def;
203         for_all_symbols(i, sym) {
204                 sym->flags |= SYMBOL_CHANGED;
205                 sym->flags &= ~(def_flags|SYMBOL_VALID);
206                 if (sym_is_choice(sym))
207                         sym->flags |= def_flags;
208                 switch (sym->type) {
209                 case S_INT:
210                 case S_HEX:
211                 case S_STRING:
212                         if (sym->def[def].val)
213                                 free(sym->def[def].val);
214                 default:
215                         sym->def[def].val = NULL;
216                         sym->def[def].tri = no;
217                 }
218         }
219
220         while (fgets(line, sizeof(line), in)) {
221                 conf_lineno++;
222                 sym = NULL;
223                 switch (line[0]) {
224                 case '#':
225                         if (memcmp(line + 2, "CONFIG_", 7))
226                                 continue;
227                         p = strchr(line + 9, ' ');
228                         if (!p)
229                                 continue;
230                         *p++ = 0;
231                         if (strncmp(p, "is not set", 10))
232                                 continue;
233                         if (def == S_DEF_USER) {
234                                 sym = sym_find(line + 9);
235                                 if (!sym) {
236                                         sym_add_change_count(1);
237                                         break;
238                                 }
239                         } else {
240                                 sym = sym_lookup(line + 9, 0);
241                                 if (sym->type == S_UNKNOWN)
242                                         sym->type = S_BOOLEAN;
243                         }
244                         if (sym->flags & def_flags) {
245                                 conf_warning("override: reassigning to symbol %s", sym->name);
246                         }
247                         switch (sym->type) {
248                         case S_BOOLEAN:
249                         case S_TRISTATE:
250                                 sym->def[def].tri = no;
251                                 sym->flags |= def_flags;
252                                 break;
253                         default:
254                                 ;
255                         }
256                         break;
257                 case 'C':
258                         if (memcmp(line, "CONFIG_", 7)) {
259                                 conf_warning("unexpected data");
260                                 continue;
261                         }
262                         p = strchr(line + 7, '=');
263                         if (!p)
264                                 continue;
265                         *p++ = 0;
266                         p2 = strchr(p, '\n');
267                         if (p2) {
268                                 *p2-- = 0;
269                                 if (*p2 == '\r')
270                                         *p2 = 0;
271                         }
272                         if (def == S_DEF_USER) {
273                                 sym = sym_find(line + 7);
274                                 if (!sym) {
275                                         sym_add_change_count(1);
276                                         break;
277                                 }
278                         } else {
279                                 sym = sym_lookup(line + 7, 0);
280                                 if (sym->type == S_UNKNOWN)
281                                         sym->type = S_OTHER;
282                         }
283                         if (sym->flags & def_flags) {
284                                 conf_warning("override: reassigning to symbol %s", sym->name);
285                         }
286                         if (conf_set_sym_val(sym, def, def_flags, p))
287                                 continue;
288                         break;
289                 case '\r':
290                 case '\n':
291                         break;
292                 default:
293                         conf_warning("unexpected data");
294                         continue;
295                 }
296                 if (sym && sym_is_choice_value(sym)) {
297                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
298                         switch (sym->def[def].tri) {
299                         case no:
300                                 break;
301                         case mod:
302                                 if (cs->def[def].tri == yes) {
303                                         conf_warning("%s creates inconsistent choice state", sym->name);
304                                         cs->flags &= ~def_flags;
305                                 }
306                                 break;
307                         case yes:
308                                 if (cs->def[def].tri != no)
309                                         conf_warning("override: %s changes choice state", sym->name);
310                                 cs->def[def].val = sym;
311                                 break;
312                         }
313                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
314                 }
315         }
316         fclose(in);
317
318         if (modules_sym)
319                 sym_calc_value(modules_sym);
320         return 0;
321 }
322
323 int conf_read(const char *name)
324 {
325         struct symbol *sym, *choice_sym;
326         struct property *prop;
327         struct expr *e;
328         int i, flags;
329
330         sym_set_change_count(0);
331
332         if (conf_read_simple(name, S_DEF_USER))
333                 return 1;
334
335         for_all_symbols(i, sym) {
336                 sym_calc_value(sym);
337                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
338                         goto sym_ok;
339                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
340                         /* check that calculated value agrees with saved value */
341                         switch (sym->type) {
342                         case S_BOOLEAN:
343                         case S_TRISTATE:
344                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
345                                         break;
346                                 if (!sym_is_choice(sym))
347                                         goto sym_ok;
348                         default:
349                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
350                                         goto sym_ok;
351                                 break;
352                         }
353                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
354                         /* no previous value and not saved */
355                         goto sym_ok;
356                 conf_unsaved++;
357                 /* maybe print value in verbose mode... */
358         sym_ok:
359                 if (!sym_is_choice(sym))
360                         continue;
361                 /* The choice symbol only has a set value (and thus is not new)
362                  * if all its visible childs have values.
363                  */
364                 prop = sym_get_choice_prop(sym);
365                 flags = sym->flags;
366                 expr_list_for_each_sym(prop->expr, e, choice_sym)
367                         if (choice_sym->visible != no)
368                                 flags &= choice_sym->flags;
369                 sym->flags &= flags | ~SYMBOL_DEF_USER;
370         }
371
372         for_all_symbols(i, sym) {
373                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
374                         /* Reset values of generates values, so they'll appear
375                          * as new, if they should become visible, but that
376                          * doesn't quite work if the Kconfig and the saved
377                          * configuration disagree.
378                          */
379                         if (sym->visible == no && !conf_unsaved)
380                                 sym->flags &= ~SYMBOL_DEF_USER;
381                         switch (sym->type) {
382                         case S_STRING:
383                         case S_INT:
384                         case S_HEX:
385                                 /* Reset a string value if it's out of range */
386                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
387                                         break;
388                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
389                                 conf_unsaved++;
390                                 break;
391                         default:
392                                 break;
393                         }
394                 }
395         }
396
397         sym_add_change_count(conf_warnings || conf_unsaved);
398
399         return 0;
400 }
401
402 /* Write a S_STRING */
403 static void conf_write_string(bool headerfile, const char *name,
404                               const char *str, FILE *out)
405 {
406         int l;
407         if (headerfile)
408                 fprintf(out, "#define CONFIG_%s \"", name);
409         else
410                 fprintf(out, "CONFIG_%s=\"", name);
411
412         while (1) {
413                 l = strcspn(str, "\"\\");
414                 if (l) {
415                         xfwrite(str, l, 1, out);
416                         str += l;
417                 }
418                 if (!*str)
419                         break;
420                 fprintf(out, "\\%c", *str++);
421         }
422         fputs("\"\n", out);
423 }
424
425 static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
426                               FILE *out, bool write_no)
427 {
428         const char *str;
429
430         switch (type) {
431         case S_BOOLEAN:
432         case S_TRISTATE:
433                 switch (sym_get_tristate_value(sym)) {
434                 case no:
435                         if (write_no)
436                                 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
437                         break;
438                 case mod:
439                         fprintf(out, "CONFIG_%s=m\n", sym->name);
440                         break;
441                 case yes:
442                         fprintf(out, "CONFIG_%s=y\n", sym->name);
443                         break;
444                 }
445                 break;
446         case S_STRING:
447                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
448                 break;
449         case S_HEX:
450         case S_INT:
451                 str = sym_get_string_value(sym);
452                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
453                 break;
454         case S_OTHER:
455         case S_UNKNOWN:
456                 break;
457         }
458 }
459
460 /*
461  * Write out a minimal config.
462  * All values that has default values are skipped as this is redundant.
463  */
464 int conf_write_defconfig(const char *filename)
465 {
466         struct symbol *sym;
467         struct menu *menu;
468         FILE *out;
469
470         out = fopen(filename, "w");
471         if (!out)
472                 return 1;
473
474         sym_clear_all_valid();
475
476         /* Traverse all menus to find all relevant symbols */
477         menu = rootmenu.list;
478
479         while (menu != NULL)
480         {
481                 sym = menu->sym;
482                 if (sym == NULL) {
483                         if (!menu_is_visible(menu))
484                                 goto next_menu;
485                 } else if (!sym_is_choice(sym)) {
486                         sym_calc_value(sym);
487                         if (!(sym->flags & SYMBOL_WRITE))
488                                 goto next_menu;
489                         sym->flags &= ~SYMBOL_WRITE;
490                         /* If we cannot change the symbol - skip */
491                         if (!sym_is_changable(sym))
492                                 goto next_menu;
493                         /* If symbol equals to default value - skip */
494                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
495                                 goto next_menu;
496
497                         /*
498                          * If symbol is a choice value and equals to the
499                          * default for a choice - skip.
500                          * But only if value is bool and equal to "y" and
501                          * choice is not "optional".
502                          * (If choice is "optional" then all values can be "n")
503                          */
504                         if (sym_is_choice_value(sym)) {
505                                 struct symbol *cs;
506                                 struct symbol *ds;
507
508                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
509                                 ds = sym_choice_default(cs);
510                                 if (!sym_is_optional(cs) && sym == ds) {
511                                         if ((sym->type == S_BOOLEAN) &&
512                                             sym_get_tristate_value(sym) == yes)
513                                                 goto next_menu;
514                                 }
515                         }
516                         conf_write_symbol(sym, sym->type, out, true);
517                 }
518 next_menu:
519                 if (menu->list != NULL) {
520                         menu = menu->list;
521                 }
522                 else if (menu->next != NULL) {
523                         menu = menu->next;
524                 } else {
525                         while ((menu = menu->parent)) {
526                                 if (menu->next != NULL) {
527                                         menu = menu->next;
528                                         break;
529                                 }
530                         }
531                 }
532         }
533         fclose(out);
534         return 0;
535 }
536
537 int conf_write(const char *name)
538 {
539         FILE *out;
540         struct symbol *sym;
541         struct menu *menu;
542         const char *basename;
543         const char *str;
544         char dirname[128], tmpname[128], newname[128];
545         enum symbol_type type;
546         time_t now;
547         int use_timestamp = 1;
548         char *env;
549
550         dirname[0] = 0;
551         if (name && name[0]) {
552                 struct stat st;
553                 char *slash;
554
555                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
556                         strcpy(dirname, name);
557                         strcat(dirname, "/");
558                         basename = conf_get_configname();
559                 } else if ((slash = strrchr(name, '/'))) {
560                         int size = slash - name + 1;
561                         memcpy(dirname, name, size);
562                         dirname[size] = 0;
563                         if (slash[1])
564                                 basename = slash + 1;
565                         else
566                                 basename = conf_get_configname();
567                 } else
568                         basename = name;
569         } else
570                 basename = conf_get_configname();
571
572         sprintf(newname, "%s%s", dirname, basename);
573         env = getenv("KCONFIG_OVERWRITECONFIG");
574         if (!env || !*env) {
575                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
576                 out = fopen(tmpname, "w");
577         } else {
578                 *tmpname = 0;
579                 out = fopen(newname, "w");
580         }
581         if (!out)
582                 return 1;
583
584         sym = sym_lookup("KERNELVERSION", 0);
585         sym_calc_value(sym);
586         time(&now);
587         env = getenv("KCONFIG_NOTIMESTAMP");
588         if (env && *env)
589                 use_timestamp = 0;
590
591         fprintf(out, _("#\n"
592                        "# Automatically generated make config: don't edit\n"
593                        "# Linux kernel version: %s\n"
594                        "%s%s"
595                        "#\n"),
596                      sym_get_string_value(sym),
597                      use_timestamp ? "# " : "",
598                      use_timestamp ? ctime(&now) : "");
599
600         if (!conf_get_changed())
601                 sym_clear_all_valid();
602
603         menu = rootmenu.list;
604         while (menu) {
605                 sym = menu->sym;
606                 if (!sym) {
607                         if (!menu_is_visible(menu))
608                                 goto next;
609                         str = menu_get_prompt(menu);
610                         fprintf(out, "\n"
611                                      "#\n"
612                                      "# %s\n"
613                                      "#\n", str);
614                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
615                         sym_calc_value(sym);
616                         if (!(sym->flags & SYMBOL_WRITE))
617                                 goto next;
618                         sym->flags &= ~SYMBOL_WRITE;
619                         type = sym->type;
620                         if (type == S_TRISTATE) {
621                                 sym_calc_value(modules_sym);
622                                 if (modules_sym->curr.tri == no)
623                                         type = S_BOOLEAN;
624                         }
625                         /* Write config symbol to file */
626                         conf_write_symbol(sym, type, out, true);
627                 }
628
629 next:
630                 if (menu->list) {
631                         menu = menu->list;
632                         continue;
633                 }
634                 if (menu->next)
635                         menu = menu->next;
636                 else while ((menu = menu->parent)) {
637                         if (menu->next) {
638                                 menu = menu->next;
639                                 break;
640                         }
641                 }
642         }
643         fclose(out);
644
645         if (*tmpname) {
646                 strcat(dirname, basename);
647                 strcat(dirname, ".old");
648                 rename(newname, dirname);
649                 if (rename(tmpname, newname))
650                         return 1;
651         }
652
653         printf(_("#\n"
654                  "# configuration written to %s\n"
655                  "#\n"), newname);
656
657         sym_set_change_count(0);
658
659         return 0;
660 }
661
662 static int conf_split_config(void)
663 {
664         const char *name;
665         char path[128];
666         char *s, *d, c;
667         struct symbol *sym;
668         struct stat sb;
669         int res, i, fd;
670
671         name = conf_get_autoconfig_name();
672         conf_read_simple(name, S_DEF_AUTO);
673
674         if (chdir("include/config"))
675                 return 1;
676
677         res = 0;
678         for_all_symbols(i, sym) {
679                 sym_calc_value(sym);
680                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
681                         continue;
682                 if (sym->flags & SYMBOL_WRITE) {
683                         if (sym->flags & SYMBOL_DEF_AUTO) {
684                                 /*
685                                  * symbol has old and new value,
686                                  * so compare them...
687                                  */
688                                 switch (sym->type) {
689                                 case S_BOOLEAN:
690                                 case S_TRISTATE:
691                                         if (sym_get_tristate_value(sym) ==
692                                             sym->def[S_DEF_AUTO].tri)
693                                                 continue;
694                                         break;
695                                 case S_STRING:
696                                 case S_HEX:
697                                 case S_INT:
698                                         if (!strcmp(sym_get_string_value(sym),
699                                                     sym->def[S_DEF_AUTO].val))
700                                                 continue;
701                                         break;
702                                 default:
703                                         break;
704                                 }
705                         } else {
706                                 /*
707                                  * If there is no old value, only 'no' (unset)
708                                  * is allowed as new value.
709                                  */
710                                 switch (sym->type) {
711                                 case S_BOOLEAN:
712                                 case S_TRISTATE:
713                                         if (sym_get_tristate_value(sym) == no)
714                                                 continue;
715                                         break;
716                                 default:
717                                         break;
718                                 }
719                         }
720                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
721                         /* There is neither an old nor a new value. */
722                         continue;
723                 /* else
724                  *      There is an old value, but no new value ('no' (unset)
725                  *      isn't saved in auto.conf, so the old value is always
726                  *      different from 'no').
727                  */
728
729                 /* Replace all '_' and append ".h" */
730                 s = sym->name;
731                 d = path;
732                 while ((c = *s++)) {
733                         c = tolower(c);
734                         *d++ = (c == '_') ? '/' : c;
735                 }
736                 strcpy(d, ".h");
737
738                 /* Assume directory path already exists. */
739                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
740                 if (fd == -1) {
741                         if (errno != ENOENT) {
742                                 res = 1;
743                                 break;
744                         }
745                         /*
746                          * Create directory components,
747                          * unless they exist already.
748                          */
749                         d = path;
750                         while ((d = strchr(d, '/'))) {
751                                 *d = 0;
752                                 if (stat(path, &sb) && mkdir(path, 0755)) {
753                                         res = 1;
754                                         goto out;
755                                 }
756                                 *d++ = '/';
757                         }
758                         /* Try it again. */
759                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
760                         if (fd == -1) {
761                                 res = 1;
762                                 break;
763                         }
764                 }
765                 close(fd);
766         }
767 out:
768         if (chdir("../.."))
769                 return 1;
770
771         return res;
772 }
773
774 int conf_write_autoconf(void)
775 {
776         struct symbol *sym;
777         const char *str;
778         const char *name;
779         FILE *out, *tristate, *out_h;
780         time_t now;
781         int i;
782
783         sym_clear_all_valid();
784
785         file_write_dep("include/config/auto.conf.cmd");
786
787         if (conf_split_config())
788                 return 1;
789
790         out = fopen(".tmpconfig", "w");
791         if (!out)
792                 return 1;
793
794         tristate = fopen(".tmpconfig_tristate", "w");
795         if (!tristate) {
796                 fclose(out);
797                 return 1;
798         }
799
800         out_h = fopen(".tmpconfig.h", "w");
801         if (!out_h) {
802                 fclose(out);
803                 fclose(tristate);
804                 return 1;
805         }
806
807         sym = sym_lookup("KERNELVERSION", 0);
808         sym_calc_value(sym);
809         time(&now);
810         fprintf(out, "#\n"
811                      "# Automatically generated make config: don't edit\n"
812                      "# Linux kernel version: %s\n"
813                      "# %s"
814                      "#\n",
815                      sym_get_string_value(sym), ctime(&now));
816         fprintf(tristate, "#\n"
817                           "# Automatically generated - do not edit\n"
818                           "\n");
819         fprintf(out_h, "/*\n"
820                        " * Automatically generated C config: don't edit\n"
821                        " * Linux kernel version: %s\n"
822                        " * %s"
823                        " */\n"
824                        "#define AUTOCONF_INCLUDED\n",
825                        sym_get_string_value(sym), ctime(&now));
826
827         for_all_symbols(i, sym) {
828                 sym_calc_value(sym);
829                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
830                         continue;
831
832                 /* write symbol to config file */
833                 conf_write_symbol(sym, sym->type, out, false);
834
835                 /* update autoconf and tristate files */
836                 switch (sym->type) {
837                 case S_BOOLEAN:
838                 case S_TRISTATE:
839                         switch (sym_get_tristate_value(sym)) {
840                         case no:
841                                 break;
842                         case mod:
843                                 fprintf(tristate, "CONFIG_%s=M\n", sym->name);
844                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
845                                 break;
846                         case yes:
847                                 if (sym->type == S_TRISTATE)
848                                         fprintf(tristate, "CONFIG_%s=Y\n",
849                                                         sym->name);
850                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
851                                 break;
852                         }
853                         break;
854                 case S_STRING:
855                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
856                         break;
857                 case S_HEX:
858                         str = sym_get_string_value(sym);
859                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
860                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
861                                 break;
862                         }
863                 case S_INT:
864                         str = sym_get_string_value(sym);
865                         fprintf(out_h, "#define CONFIG_%s %s\n", 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 slected
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 equal to mod then we can select several
1028          * choice symbols in one block.
1029          * In this case we do nothing.
1030          * If curr.tri equal 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 }