59b667cae5f33e4437e1beaa6bdfcdcb93bc8fcb
[~shefty/rdma-dev.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 /*
426  * Kconfig configuration printer
427  *
428  * This printer is used when generating the resulting configuration after
429  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
430  * passing a non-NULL argument to the printer.
431  *
432  */
433 static void
434 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
435 {
436
437         switch (sym->type) {
438         case S_BOOLEAN:
439         case S_TRISTATE:
440                 if (*value == 'n') {
441                         bool skip_unset = (arg != NULL);
442
443                         if (!skip_unset)
444                                 fprintf(fp, "# %s%s is not set\n",
445                                     CONFIG_, sym->name);
446                         return;
447                 }
448                 break;
449         default:
450                 break;
451         }
452
453         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
454 }
455
456 static void
457 kconfig_print_comment(FILE *fp, const char *value, void *arg)
458 {
459         const char *p = value;
460         size_t l;
461
462         for (;;) {
463                 l = strcspn(p, "\n");
464                 fprintf(fp, "#");
465                 if (l) {
466                         fprintf(fp, " ");
467                         fwrite(p, l, 1, fp);
468                         p += l;
469                 }
470                 fprintf(fp, "\n");
471                 if (*p++ == '\0')
472                         break;
473         }
474 }
475
476 static struct conf_printer kconfig_printer_cb =
477 {
478         .print_symbol = kconfig_print_symbol,
479         .print_comment = kconfig_print_comment,
480 };
481
482 /*
483  * Header printer
484  *
485  * This printer is used when generating the `include/generated/autoconf.h' file.
486  */
487 static void
488 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
489 {
490
491         switch (sym->type) {
492         case S_BOOLEAN:
493         case S_TRISTATE: {
494                 const char *suffix = "";
495
496                 switch (*value) {
497                 case 'n':
498                         break;
499                 case 'm':
500                         suffix = "_MODULE";
501                         /* fall through */
502                 default:
503                         fprintf(fp, "#define %s%s%s 1\n",
504                             CONFIG_, sym->name, suffix);
505                 }
506                 /*
507                  * Generate the __enabled_CONFIG_* and
508                  * __enabled_CONFIG_*_MODULE macros for use by the
509                  * IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
510                  * generated even for booleans so that the IS_ENABLED() macro
511                  * works.
512                  */
513                 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
514                                 sym->name, (*value == 'y'));
515                 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
516                                 sym->name, (*value == 'm'));
517                 break;
518         }
519         case S_HEX: {
520                 const char *prefix = "";
521
522                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
523                         prefix = "0x";
524                 fprintf(fp, "#define %s%s %s%s\n",
525                     CONFIG_, sym->name, prefix, value);
526                 break;
527         }
528         case S_STRING:
529         case S_INT:
530                 fprintf(fp, "#define %s%s %s\n",
531                     CONFIG_, sym->name, value);
532                 break;
533         default:
534                 break;
535         }
536
537 }
538
539 static void
540 header_print_comment(FILE *fp, const char *value, void *arg)
541 {
542         const char *p = value;
543         size_t l;
544
545         fprintf(fp, "/*\n");
546         for (;;) {
547                 l = strcspn(p, "\n");
548                 fprintf(fp, " *");
549                 if (l) {
550                         fprintf(fp, " ");
551                         fwrite(p, l, 1, fp);
552                         p += l;
553                 }
554                 fprintf(fp, "\n");
555                 if (*p++ == '\0')
556                         break;
557         }
558         fprintf(fp, " */\n");
559 }
560
561 static struct conf_printer header_printer_cb =
562 {
563         .print_symbol = header_print_symbol,
564         .print_comment = header_print_comment,
565 };
566
567 /*
568  * Tristate printer
569  *
570  * This printer is used when generating the `include/config/tristate.conf' file.
571  */
572 static void
573 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
574 {
575
576         if (sym->type == S_TRISTATE && *value != 'n')
577                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
578 }
579
580 static struct conf_printer tristate_printer_cb =
581 {
582         .print_symbol = tristate_print_symbol,
583         .print_comment = kconfig_print_comment,
584 };
585
586 static void conf_write_symbol(FILE *fp, struct symbol *sym,
587                               struct conf_printer *printer, void *printer_arg)
588 {
589         const char *str;
590
591         switch (sym->type) {
592         case S_OTHER:
593         case S_UNKNOWN:
594                 break;
595         case S_STRING:
596                 str = sym_get_string_value(sym);
597                 str = sym_escape_string_value(str);
598                 printer->print_symbol(fp, sym, str, printer_arg);
599                 free((void *)str);
600                 break;
601         default:
602                 str = sym_get_string_value(sym);
603                 printer->print_symbol(fp, sym, str, printer_arg);
604         }
605 }
606
607 static void
608 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
609 {
610         char buf[256];
611
612         snprintf(buf, sizeof(buf),
613             "\n"
614             "Automatically generated file; DO NOT EDIT.\n"
615             "%s\n",
616             rootmenu.prompt->text);
617
618         printer->print_comment(fp, buf, printer_arg);
619 }
620
621 /*
622  * Write out a minimal config.
623  * All values that has default values are skipped as this is redundant.
624  */
625 int conf_write_defconfig(const char *filename)
626 {
627         struct symbol *sym;
628         struct menu *menu;
629         FILE *out;
630
631         out = fopen(filename, "w");
632         if (!out)
633                 return 1;
634
635         sym_clear_all_valid();
636
637         /* Traverse all menus to find all relevant symbols */
638         menu = rootmenu.list;
639
640         while (menu != NULL)
641         {
642                 sym = menu->sym;
643                 if (sym == NULL) {
644                         if (!menu_is_visible(menu))
645                                 goto next_menu;
646                 } else if (!sym_is_choice(sym)) {
647                         sym_calc_value(sym);
648                         if (!(sym->flags & SYMBOL_WRITE))
649                                 goto next_menu;
650                         sym->flags &= ~SYMBOL_WRITE;
651                         /* If we cannot change the symbol - skip */
652                         if (!sym_is_changable(sym))
653                                 goto next_menu;
654                         /* If symbol equals to default value - skip */
655                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
656                                 goto next_menu;
657
658                         /*
659                          * If symbol is a choice value and equals to the
660                          * default for a choice - skip.
661                          * But only if value is bool and equal to "y" and
662                          * choice is not "optional".
663                          * (If choice is "optional" then all values can be "n")
664                          */
665                         if (sym_is_choice_value(sym)) {
666                                 struct symbol *cs;
667                                 struct symbol *ds;
668
669                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
670                                 ds = sym_choice_default(cs);
671                                 if (!sym_is_optional(cs) && sym == ds) {
672                                         if ((sym->type == S_BOOLEAN) &&
673                                             sym_get_tristate_value(sym) == yes)
674                                                 goto next_menu;
675                                 }
676                         }
677                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
678                 }
679 next_menu:
680                 if (menu->list != NULL) {
681                         menu = menu->list;
682                 }
683                 else if (menu->next != NULL) {
684                         menu = menu->next;
685                 } else {
686                         while ((menu = menu->parent)) {
687                                 if (menu->next != NULL) {
688                                         menu = menu->next;
689                                         break;
690                                 }
691                         }
692                 }
693         }
694         fclose(out);
695         return 0;
696 }
697
698 int conf_write(const char *name)
699 {
700         FILE *out;
701         struct symbol *sym;
702         struct menu *menu;
703         const char *basename;
704         const char *str;
705         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
706         char *env;
707
708         dirname[0] = 0;
709         if (name && name[0]) {
710                 struct stat st;
711                 char *slash;
712
713                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
714                         strcpy(dirname, name);
715                         strcat(dirname, "/");
716                         basename = conf_get_configname();
717                 } else if ((slash = strrchr(name, '/'))) {
718                         int size = slash - name + 1;
719                         memcpy(dirname, name, size);
720                         dirname[size] = 0;
721                         if (slash[1])
722                                 basename = slash + 1;
723                         else
724                                 basename = conf_get_configname();
725                 } else
726                         basename = name;
727         } else
728                 basename = conf_get_configname();
729
730         sprintf(newname, "%s%s", dirname, basename);
731         env = getenv("KCONFIG_OVERWRITECONFIG");
732         if (!env || !*env) {
733                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
734                 out = fopen(tmpname, "w");
735         } else {
736                 *tmpname = 0;
737                 out = fopen(newname, "w");
738         }
739         if (!out)
740                 return 1;
741
742         conf_write_heading(out, &kconfig_printer_cb, NULL);
743
744         if (!conf_get_changed())
745                 sym_clear_all_valid();
746
747         menu = rootmenu.list;
748         while (menu) {
749                 sym = menu->sym;
750                 if (!sym) {
751                         if (!menu_is_visible(menu))
752                                 goto next;
753                         str = menu_get_prompt(menu);
754                         fprintf(out, "\n"
755                                      "#\n"
756                                      "# %s\n"
757                                      "#\n", str);
758                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
759                         sym_calc_value(sym);
760                         if (!(sym->flags & SYMBOL_WRITE))
761                                 goto next;
762                         sym->flags &= ~SYMBOL_WRITE;
763
764                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
765                 }
766
767 next:
768                 if (menu->list) {
769                         menu = menu->list;
770                         continue;
771                 }
772                 if (menu->next)
773                         menu = menu->next;
774                 else while ((menu = menu->parent)) {
775                         if (menu->next) {
776                                 menu = menu->next;
777                                 break;
778                         }
779                 }
780         }
781         fclose(out);
782
783         if (*tmpname) {
784                 strcat(dirname, basename);
785                 strcat(dirname, ".old");
786                 rename(newname, dirname);
787                 if (rename(tmpname, newname))
788                         return 1;
789         }
790
791         conf_message(_("configuration written to %s"), newname);
792
793         sym_set_change_count(0);
794
795         return 0;
796 }
797
798 static int conf_split_config(void)
799 {
800         const char *name;
801         char path[PATH_MAX+1];
802         char *s, *d, c;
803         struct symbol *sym;
804         struct stat sb;
805         int res, i, fd;
806
807         name = conf_get_autoconfig_name();
808         conf_read_simple(name, S_DEF_AUTO);
809
810         if (chdir("include/config"))
811                 return 1;
812
813         res = 0;
814         for_all_symbols(i, sym) {
815                 sym_calc_value(sym);
816                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
817                         continue;
818                 if (sym->flags & SYMBOL_WRITE) {
819                         if (sym->flags & SYMBOL_DEF_AUTO) {
820                                 /*
821                                  * symbol has old and new value,
822                                  * so compare them...
823                                  */
824                                 switch (sym->type) {
825                                 case S_BOOLEAN:
826                                 case S_TRISTATE:
827                                         if (sym_get_tristate_value(sym) ==
828                                             sym->def[S_DEF_AUTO].tri)
829                                                 continue;
830                                         break;
831                                 case S_STRING:
832                                 case S_HEX:
833                                 case S_INT:
834                                         if (!strcmp(sym_get_string_value(sym),
835                                                     sym->def[S_DEF_AUTO].val))
836                                                 continue;
837                                         break;
838                                 default:
839                                         break;
840                                 }
841                         } else {
842                                 /*
843                                  * If there is no old value, only 'no' (unset)
844                                  * is allowed as new value.
845                                  */
846                                 switch (sym->type) {
847                                 case S_BOOLEAN:
848                                 case S_TRISTATE:
849                                         if (sym_get_tristate_value(sym) == no)
850                                                 continue;
851                                         break;
852                                 default:
853                                         break;
854                                 }
855                         }
856                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
857                         /* There is neither an old nor a new value. */
858                         continue;
859                 /* else
860                  *      There is an old value, but no new value ('no' (unset)
861                  *      isn't saved in auto.conf, so the old value is always
862                  *      different from 'no').
863                  */
864
865                 /* Replace all '_' and append ".h" */
866                 s = sym->name;
867                 d = path;
868                 while ((c = *s++)) {
869                         c = tolower(c);
870                         *d++ = (c == '_') ? '/' : c;
871                 }
872                 strcpy(d, ".h");
873
874                 /* Assume directory path already exists. */
875                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
876                 if (fd == -1) {
877                         if (errno != ENOENT) {
878                                 res = 1;
879                                 break;
880                         }
881                         /*
882                          * Create directory components,
883                          * unless they exist already.
884                          */
885                         d = path;
886                         while ((d = strchr(d, '/'))) {
887                                 *d = 0;
888                                 if (stat(path, &sb) && mkdir(path, 0755)) {
889                                         res = 1;
890                                         goto out;
891                                 }
892                                 *d++ = '/';
893                         }
894                         /* Try it again. */
895                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
896                         if (fd == -1) {
897                                 res = 1;
898                                 break;
899                         }
900                 }
901                 close(fd);
902         }
903 out:
904         if (chdir("../.."))
905                 return 1;
906
907         return res;
908 }
909
910 int conf_write_autoconf(void)
911 {
912         struct symbol *sym;
913         const char *name;
914         FILE *out, *tristate, *out_h;
915         int i;
916
917         sym_clear_all_valid();
918
919         file_write_dep("include/config/auto.conf.cmd");
920
921         if (conf_split_config())
922                 return 1;
923
924         out = fopen(".tmpconfig", "w");
925         if (!out)
926                 return 1;
927
928         tristate = fopen(".tmpconfig_tristate", "w");
929         if (!tristate) {
930                 fclose(out);
931                 return 1;
932         }
933
934         out_h = fopen(".tmpconfig.h", "w");
935         if (!out_h) {
936                 fclose(out);
937                 fclose(tristate);
938                 return 1;
939         }
940
941         conf_write_heading(out, &kconfig_printer_cb, NULL);
942
943         conf_write_heading(tristate, &tristate_printer_cb, NULL);
944
945         conf_write_heading(out_h, &header_printer_cb, NULL);
946
947         for_all_symbols(i, sym) {
948                 sym_calc_value(sym);
949                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
950                         continue;
951
952                 /* write symbol to auto.conf, tristate and header files */
953                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
954
955                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
956
957                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
958         }
959         fclose(out);
960         fclose(tristate);
961         fclose(out_h);
962
963         name = getenv("KCONFIG_AUTOHEADER");
964         if (!name)
965                 name = "include/generated/autoconf.h";
966         if (rename(".tmpconfig.h", name))
967                 return 1;
968         name = getenv("KCONFIG_TRISTATE");
969         if (!name)
970                 name = "include/config/tristate.conf";
971         if (rename(".tmpconfig_tristate", name))
972                 return 1;
973         name = conf_get_autoconfig_name();
974         /*
975          * This must be the last step, kbuild has a dependency on auto.conf
976          * and this marks the successful completion of the previous steps.
977          */
978         if (rename(".tmpconfig", name))
979                 return 1;
980
981         return 0;
982 }
983
984 static int sym_change_count;
985 static void (*conf_changed_callback)(void);
986
987 void sym_set_change_count(int count)
988 {
989         int _sym_change_count = sym_change_count;
990         sym_change_count = count;
991         if (conf_changed_callback &&
992             (bool)_sym_change_count != (bool)count)
993                 conf_changed_callback();
994 }
995
996 void sym_add_change_count(int count)
997 {
998         sym_set_change_count(count + sym_change_count);
999 }
1000
1001 bool conf_get_changed(void)
1002 {
1003         return sym_change_count;
1004 }
1005
1006 void conf_set_changed_callback(void (*fn)(void))
1007 {
1008         conf_changed_callback = fn;
1009 }
1010
1011 static void randomize_choice_values(struct symbol *csym)
1012 {
1013         struct property *prop;
1014         struct symbol *sym;
1015         struct expr *e;
1016         int cnt, def;
1017
1018         /*
1019          * If choice is mod then we may have more items selected
1020          * and if no then no-one.
1021          * In both cases stop.
1022          */
1023         if (csym->curr.tri != yes)
1024                 return;
1025
1026         prop = sym_get_choice_prop(csym);
1027
1028         /* count entries in choice block */
1029         cnt = 0;
1030         expr_list_for_each_sym(prop->expr, e, sym)
1031                 cnt++;
1032
1033         /*
1034          * find a random value and set it to yes,
1035          * set the rest to no so we have only one set
1036          */
1037         def = (rand() % cnt);
1038
1039         cnt = 0;
1040         expr_list_for_each_sym(prop->expr, e, sym) {
1041                 if (def == cnt++) {
1042                         sym->def[S_DEF_USER].tri = yes;
1043                         csym->def[S_DEF_USER].val = sym;
1044                 }
1045                 else {
1046                         sym->def[S_DEF_USER].tri = no;
1047                 }
1048         }
1049         csym->flags |= SYMBOL_DEF_USER;
1050         /* clear VALID to get value calculated */
1051         csym->flags &= ~(SYMBOL_VALID);
1052 }
1053
1054 static void set_all_choice_values(struct symbol *csym)
1055 {
1056         struct property *prop;
1057         struct symbol *sym;
1058         struct expr *e;
1059
1060         prop = sym_get_choice_prop(csym);
1061
1062         /*
1063          * Set all non-assinged choice values to no
1064          */
1065         expr_list_for_each_sym(prop->expr, e, sym) {
1066                 if (!sym_has_value(sym))
1067                         sym->def[S_DEF_USER].tri = no;
1068         }
1069         csym->flags |= SYMBOL_DEF_USER;
1070         /* clear VALID to get value calculated */
1071         csym->flags &= ~(SYMBOL_VALID);
1072 }
1073
1074 void conf_set_all_new_symbols(enum conf_def_mode mode)
1075 {
1076         struct symbol *sym, *csym;
1077         int i, cnt;
1078
1079         for_all_symbols(i, sym) {
1080                 if (sym_has_value(sym))
1081                         continue;
1082                 switch (sym_get_type(sym)) {
1083                 case S_BOOLEAN:
1084                 case S_TRISTATE:
1085                         switch (mode) {
1086                         case def_yes:
1087                                 sym->def[S_DEF_USER].tri = yes;
1088                                 break;
1089                         case def_mod:
1090                                 sym->def[S_DEF_USER].tri = mod;
1091                                 break;
1092                         case def_no:
1093                                 sym->def[S_DEF_USER].tri = no;
1094                                 break;
1095                         case def_random:
1096                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1097                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1098                                 break;
1099                         default:
1100                                 continue;
1101                         }
1102                         if (!(sym_is_choice(sym) && mode == def_random))
1103                                 sym->flags |= SYMBOL_DEF_USER;
1104                         break;
1105                 default:
1106                         break;
1107                 }
1108
1109         }
1110
1111         sym_clear_all_valid();
1112
1113         /*
1114          * We have different type of choice blocks.
1115          * If curr.tri equals to mod then we can select several
1116          * choice symbols in one block.
1117          * In this case we do nothing.
1118          * If curr.tri equals yes then only one symbol can be
1119          * selected in a choice block and we set it to yes,
1120          * and the rest to no.
1121          */
1122         for_all_symbols(i, csym) {
1123                 if (sym_has_value(csym) || !sym_is_choice(csym))
1124                         continue;
1125
1126                 sym_calc_value(csym);
1127                 if (mode == def_random)
1128                         randomize_choice_values(csym);
1129                 else
1130                         set_all_choice_values(csym);
1131         }
1132 }