kconfig: Fix warning: ignoring return value of 'fwrite'
[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" .
501                          */
502                         if (sym_is_choice_value(sym)) {
503                                 struct symbol *cs;
504                                 struct symbol *ds;
505
506                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
507                                 ds = sym_choice_default(cs);
508                                 if (sym == ds) {
509                                         if ((sym->type == S_BOOLEAN) &&
510                                             sym_get_tristate_value(sym) == yes)
511                                                 goto next_menu;
512                                 }
513                         }
514                         conf_write_symbol(sym, sym->type, out, true);
515                 }
516 next_menu:
517                 if (menu->list != NULL) {
518                         menu = menu->list;
519                 }
520                 else if (menu->next != NULL) {
521                         menu = menu->next;
522                 } else {
523                         while ((menu = menu->parent)) {
524                                 if (menu->next != NULL) {
525                                         menu = menu->next;
526                                         break;
527                                 }
528                         }
529                 }
530         }
531         fclose(out);
532         return 0;
533 }
534
535 int conf_write(const char *name)
536 {
537         FILE *out;
538         struct symbol *sym;
539         struct menu *menu;
540         const char *basename;
541         const char *str;
542         char dirname[128], tmpname[128], newname[128];
543         enum symbol_type type;
544         time_t now;
545         int use_timestamp = 1;
546         char *env;
547
548         dirname[0] = 0;
549         if (name && name[0]) {
550                 struct stat st;
551                 char *slash;
552
553                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
554                         strcpy(dirname, name);
555                         strcat(dirname, "/");
556                         basename = conf_get_configname();
557                 } else if ((slash = strrchr(name, '/'))) {
558                         int size = slash - name + 1;
559                         memcpy(dirname, name, size);
560                         dirname[size] = 0;
561                         if (slash[1])
562                                 basename = slash + 1;
563                         else
564                                 basename = conf_get_configname();
565                 } else
566                         basename = name;
567         } else
568                 basename = conf_get_configname();
569
570         sprintf(newname, "%s%s", dirname, basename);
571         env = getenv("KCONFIG_OVERWRITECONFIG");
572         if (!env || !*env) {
573                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
574                 out = fopen(tmpname, "w");
575         } else {
576                 *tmpname = 0;
577                 out = fopen(newname, "w");
578         }
579         if (!out)
580                 return 1;
581
582         sym = sym_lookup("KERNELVERSION", 0);
583         sym_calc_value(sym);
584         time(&now);
585         env = getenv("KCONFIG_NOTIMESTAMP");
586         if (env && *env)
587                 use_timestamp = 0;
588
589         fprintf(out, _("#\n"
590                        "# Automatically generated make config: don't edit\n"
591                        "# Linux kernel version: %s\n"
592                        "%s%s"
593                        "#\n"),
594                      sym_get_string_value(sym),
595                      use_timestamp ? "# " : "",
596                      use_timestamp ? ctime(&now) : "");
597
598         if (!conf_get_changed())
599                 sym_clear_all_valid();
600
601         menu = rootmenu.list;
602         while (menu) {
603                 sym = menu->sym;
604                 if (!sym) {
605                         if (!menu_is_visible(menu))
606                                 goto next;
607                         str = menu_get_prompt(menu);
608                         fprintf(out, "\n"
609                                      "#\n"
610                                      "# %s\n"
611                                      "#\n", str);
612                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
613                         sym_calc_value(sym);
614                         if (!(sym->flags & SYMBOL_WRITE))
615                                 goto next;
616                         sym->flags &= ~SYMBOL_WRITE;
617                         type = sym->type;
618                         if (type == S_TRISTATE) {
619                                 sym_calc_value(modules_sym);
620                                 if (modules_sym->curr.tri == no)
621                                         type = S_BOOLEAN;
622                         }
623                         /* Write config symbol to file */
624                         conf_write_symbol(sym, type, out, true);
625                 }
626
627 next:
628                 if (menu->list) {
629                         menu = menu->list;
630                         continue;
631                 }
632                 if (menu->next)
633                         menu = menu->next;
634                 else while ((menu = menu->parent)) {
635                         if (menu->next) {
636                                 menu = menu->next;
637                                 break;
638                         }
639                 }
640         }
641         fclose(out);
642
643         if (*tmpname) {
644                 strcat(dirname, basename);
645                 strcat(dirname, ".old");
646                 rename(newname, dirname);
647                 if (rename(tmpname, newname))
648                         return 1;
649         }
650
651         printf(_("#\n"
652                  "# configuration written to %s\n"
653                  "#\n"), newname);
654
655         sym_set_change_count(0);
656
657         return 0;
658 }
659
660 static int conf_split_config(void)
661 {
662         const char *name;
663         char path[128];
664         char *s, *d, c;
665         struct symbol *sym;
666         struct stat sb;
667         int res, i, fd;
668
669         name = conf_get_autoconfig_name();
670         conf_read_simple(name, S_DEF_AUTO);
671
672         if (chdir("include/config"))
673                 return 1;
674
675         res = 0;
676         for_all_symbols(i, sym) {
677                 sym_calc_value(sym);
678                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
679                         continue;
680                 if (sym->flags & SYMBOL_WRITE) {
681                         if (sym->flags & SYMBOL_DEF_AUTO) {
682                                 /*
683                                  * symbol has old and new value,
684                                  * so compare them...
685                                  */
686                                 switch (sym->type) {
687                                 case S_BOOLEAN:
688                                 case S_TRISTATE:
689                                         if (sym_get_tristate_value(sym) ==
690                                             sym->def[S_DEF_AUTO].tri)
691                                                 continue;
692                                         break;
693                                 case S_STRING:
694                                 case S_HEX:
695                                 case S_INT:
696                                         if (!strcmp(sym_get_string_value(sym),
697                                                     sym->def[S_DEF_AUTO].val))
698                                                 continue;
699                                         break;
700                                 default:
701                                         break;
702                                 }
703                         } else {
704                                 /*
705                                  * If there is no old value, only 'no' (unset)
706                                  * is allowed as new value.
707                                  */
708                                 switch (sym->type) {
709                                 case S_BOOLEAN:
710                                 case S_TRISTATE:
711                                         if (sym_get_tristate_value(sym) == no)
712                                                 continue;
713                                         break;
714                                 default:
715                                         break;
716                                 }
717                         }
718                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
719                         /* There is neither an old nor a new value. */
720                         continue;
721                 /* else
722                  *      There is an old value, but no new value ('no' (unset)
723                  *      isn't saved in auto.conf, so the old value is always
724                  *      different from 'no').
725                  */
726
727                 /* Replace all '_' and append ".h" */
728                 s = sym->name;
729                 d = path;
730                 while ((c = *s++)) {
731                         c = tolower(c);
732                         *d++ = (c == '_') ? '/' : c;
733                 }
734                 strcpy(d, ".h");
735
736                 /* Assume directory path already exists. */
737                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
738                 if (fd == -1) {
739                         if (errno != ENOENT) {
740                                 res = 1;
741                                 break;
742                         }
743                         /*
744                          * Create directory components,
745                          * unless they exist already.
746                          */
747                         d = path;
748                         while ((d = strchr(d, '/'))) {
749                                 *d = 0;
750                                 if (stat(path, &sb) && mkdir(path, 0755)) {
751                                         res = 1;
752                                         goto out;
753                                 }
754                                 *d++ = '/';
755                         }
756                         /* Try it again. */
757                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
758                         if (fd == -1) {
759                                 res = 1;
760                                 break;
761                         }
762                 }
763                 close(fd);
764         }
765 out:
766         if (chdir("../.."))
767                 return 1;
768
769         return res;
770 }
771
772 int conf_write_autoconf(void)
773 {
774         struct symbol *sym;
775         const char *str;
776         const char *name;
777         FILE *out, *tristate, *out_h;
778         time_t now;
779         int i;
780
781         sym_clear_all_valid();
782
783         file_write_dep("include/config/auto.conf.cmd");
784
785         if (conf_split_config())
786                 return 1;
787
788         out = fopen(".tmpconfig", "w");
789         if (!out)
790                 return 1;
791
792         tristate = fopen(".tmpconfig_tristate", "w");
793         if (!tristate) {
794                 fclose(out);
795                 return 1;
796         }
797
798         out_h = fopen(".tmpconfig.h", "w");
799         if (!out_h) {
800                 fclose(out);
801                 fclose(tristate);
802                 return 1;
803         }
804
805         sym = sym_lookup("KERNELVERSION", 0);
806         sym_calc_value(sym);
807         time(&now);
808         fprintf(out, "#\n"
809                      "# Automatically generated make config: don't edit\n"
810                      "# Linux kernel version: %s\n"
811                      "# %s"
812                      "#\n",
813                      sym_get_string_value(sym), ctime(&now));
814         fprintf(tristate, "#\n"
815                           "# Automatically generated - do not edit\n"
816                           "\n");
817         fprintf(out_h, "/*\n"
818                        " * Automatically generated C config: don't edit\n"
819                        " * Linux kernel version: %s\n"
820                        " * %s"
821                        " */\n"
822                        "#define AUTOCONF_INCLUDED\n",
823                        sym_get_string_value(sym), ctime(&now));
824
825         for_all_symbols(i, sym) {
826                 sym_calc_value(sym);
827                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
828                         continue;
829
830                 /* write symbol to config file */
831                 conf_write_symbol(sym, sym->type, out, false);
832
833                 /* update autoconf and tristate files */
834                 switch (sym->type) {
835                 case S_BOOLEAN:
836                 case S_TRISTATE:
837                         switch (sym_get_tristate_value(sym)) {
838                         case no:
839                                 break;
840                         case mod:
841                                 fprintf(tristate, "CONFIG_%s=M\n", sym->name);
842                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
843                                 break;
844                         case yes:
845                                 if (sym->type == S_TRISTATE)
846                                         fprintf(tristate, "CONFIG_%s=Y\n",
847                                                         sym->name);
848                                 fprintf(out_h, "#define CONFIG_%s 1\n", 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 CONFIG_%s 0x%s\n", sym->name, str);
859                                 break;
860                         }
861                 case S_INT:
862                         str = sym_get_string_value(sym);
863                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
864                         break;
865                 default:
866                         break;
867                 }
868         }
869         fclose(out);
870         fclose(tristate);
871         fclose(out_h);
872
873         name = getenv("KCONFIG_AUTOHEADER");
874         if (!name)
875                 name = "include/generated/autoconf.h";
876         if (rename(".tmpconfig.h", name))
877                 return 1;
878         name = getenv("KCONFIG_TRISTATE");
879         if (!name)
880                 name = "include/config/tristate.conf";
881         if (rename(".tmpconfig_tristate", name))
882                 return 1;
883         name = conf_get_autoconfig_name();
884         /*
885          * This must be the last step, kbuild has a dependency on auto.conf
886          * and this marks the successful completion of the previous steps.
887          */
888         if (rename(".tmpconfig", name))
889                 return 1;
890
891         return 0;
892 }
893
894 static int sym_change_count;
895 static void (*conf_changed_callback)(void);
896
897 void sym_set_change_count(int count)
898 {
899         int _sym_change_count = sym_change_count;
900         sym_change_count = count;
901         if (conf_changed_callback &&
902             (bool)_sym_change_count != (bool)count)
903                 conf_changed_callback();
904 }
905
906 void sym_add_change_count(int count)
907 {
908         sym_set_change_count(count + sym_change_count);
909 }
910
911 bool conf_get_changed(void)
912 {
913         return sym_change_count;
914 }
915
916 void conf_set_changed_callback(void (*fn)(void))
917 {
918         conf_changed_callback = fn;
919 }
920
921 static void randomize_choice_values(struct symbol *csym)
922 {
923         struct property *prop;
924         struct symbol *sym;
925         struct expr *e;
926         int cnt, def;
927
928         /*
929          * If choice is mod then we may have more items slected
930          * and if no then no-one.
931          * In both cases stop.
932          */
933         if (csym->curr.tri != yes)
934                 return;
935
936         prop = sym_get_choice_prop(csym);
937
938         /* count entries in choice block */
939         cnt = 0;
940         expr_list_for_each_sym(prop->expr, e, sym)
941                 cnt++;
942
943         /*
944          * find a random value and set it to yes,
945          * set the rest to no so we have only one set
946          */
947         def = (rand() % cnt);
948
949         cnt = 0;
950         expr_list_for_each_sym(prop->expr, e, sym) {
951                 if (def == cnt++) {
952                         sym->def[S_DEF_USER].tri = yes;
953                         csym->def[S_DEF_USER].val = sym;
954                 }
955                 else {
956                         sym->def[S_DEF_USER].tri = no;
957                 }
958         }
959         csym->flags |= SYMBOL_DEF_USER;
960         /* clear VALID to get value calculated */
961         csym->flags &= ~(SYMBOL_VALID);
962 }
963
964 static void set_all_choice_values(struct symbol *csym)
965 {
966         struct property *prop;
967         struct symbol *sym;
968         struct expr *e;
969
970         prop = sym_get_choice_prop(csym);
971
972         /*
973          * Set all non-assinged choice values to no
974          */
975         expr_list_for_each_sym(prop->expr, e, sym) {
976                 if (!sym_has_value(sym))
977                         sym->def[S_DEF_USER].tri = no;
978         }
979         csym->flags |= SYMBOL_DEF_USER;
980         /* clear VALID to get value calculated */
981         csym->flags &= ~(SYMBOL_VALID);
982 }
983
984 void conf_set_all_new_symbols(enum conf_def_mode mode)
985 {
986         struct symbol *sym, *csym;
987         int i, cnt;
988
989         for_all_symbols(i, sym) {
990                 if (sym_has_value(sym))
991                         continue;
992                 switch (sym_get_type(sym)) {
993                 case S_BOOLEAN:
994                 case S_TRISTATE:
995                         switch (mode) {
996                         case def_yes:
997                                 sym->def[S_DEF_USER].tri = yes;
998                                 break;
999                         case def_mod:
1000                                 sym->def[S_DEF_USER].tri = mod;
1001                                 break;
1002                         case def_no:
1003                                 sym->def[S_DEF_USER].tri = no;
1004                                 break;
1005                         case def_random:
1006                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1007                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1008                                 break;
1009                         default:
1010                                 continue;
1011                         }
1012                         if (!(sym_is_choice(sym) && mode == def_random))
1013                                 sym->flags |= SYMBOL_DEF_USER;
1014                         break;
1015                 default:
1016                         break;
1017                 }
1018
1019         }
1020
1021         sym_clear_all_valid();
1022
1023         /*
1024          * We have different type of choice blocks.
1025          * If curr.tri equal to mod then we can select several
1026          * choice symbols in one block.
1027          * In this case we do nothing.
1028          * If curr.tri equal yes then only one symbol can be
1029          * selected in a choice block and we set it to yes,
1030          * and the rest to no.
1031          */
1032         for_all_symbols(i, csym) {
1033                 if (sym_has_value(csym) || !sym_is_choice(csym))
1034                         continue;
1035
1036                 sym_calc_value(csym);
1037                 if (mode == def_random)
1038                         randomize_choice_values(csym);
1039                 else
1040                         set_all_choice_values(csym);
1041         }
1042 }