Updates Kconfig
[akaros.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 #define LINE_GROWTH 16
186 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
187 {
188         char *nline;
189         size_t new_size = slen + 1;
190         if (new_size > *n) {
191                 new_size += LINE_GROWTH - 1;
192                 new_size *= 2;
193                 nline = realloc(*lineptr, new_size);
194                 if (!nline)
195                         return -1;
196
197                 *lineptr = nline;
198                 *n = new_size;
199         }
200
201         (*lineptr)[slen] = c;
202
203         return 0;
204 }
205
206 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
207 {
208         char *line = *lineptr;
209         size_t slen = 0;
210
211         for (;;) {
212                 int c = getc(stream);
213
214                 switch (c) {
215                 case '\n':
216                         if (add_byte(c, &line, slen, n) < 0)
217                                 goto e_out;
218                         slen++;
219                         /* fall through */
220                 case EOF:
221                         if (add_byte('\0', &line, slen, n) < 0)
222                                 goto e_out;
223                         *lineptr = line;
224                         if (slen == 0)
225                                 return -1;
226                         return slen;
227                 default:
228                         if (add_byte(c, &line, slen, n) < 0)
229                                 goto e_out;
230                         slen++;
231                 }
232         }
233
234 e_out:
235         line[slen-1] = '\0';
236         *lineptr = line;
237         return -1;
238 }
239
240 int conf_read_simple(const char *name, int def)
241 {
242         FILE *in = NULL;
243         char   *line = NULL;
244         size_t  line_asize = 0;
245         char *p, *p2;
246         struct symbol *sym;
247         int i, def_flags;
248
249         if (name) {
250                 in = zconf_fopen(name);
251         } else {
252                 struct property *prop;
253
254                 name = conf_get_configname();
255                 in = zconf_fopen(name);
256                 if (in)
257                         goto load;
258                 sym_add_change_count(1);
259                 if (!sym_defconfig_list) {
260                         if (modules_sym)
261                                 sym_calc_value(modules_sym);
262                         return 1;
263                 }
264
265                 for_all_defaults(sym_defconfig_list, prop) {
266                         if (expr_calc_value(prop->visible.expr) == no ||
267                             prop->expr->type != E_SYMBOL)
268                                 continue;
269                         name = conf_expand_value(prop->expr->left.sym->name);
270                         in = zconf_fopen(name);
271                         if (in) {
272                                 conf_message(_("using defaults found in %s"),
273                                          name);
274                                 goto load;
275                         }
276                 }
277         }
278         if (!in)
279                 return 1;
280
281 load:
282         conf_filename = name;
283         conf_lineno = 0;
284         conf_warnings = 0;
285         conf_unsaved = 0;
286
287         def_flags = SYMBOL_DEF << def;
288         for_all_symbols(i, sym) {
289                 sym->flags |= SYMBOL_CHANGED;
290                 sym->flags &= ~(def_flags|SYMBOL_VALID);
291                 if (sym_is_choice(sym))
292                         sym->flags |= def_flags;
293                 switch (sym->type) {
294                 case S_INT:
295                 case S_HEX:
296                 case S_STRING:
297                         if (sym->def[def].val)
298                                 free(sym->def[def].val);
299                         /* fall through */
300                 default:
301                         sym->def[def].val = NULL;
302                         sym->def[def].tri = no;
303                 }
304         }
305
306         while (compat_getline(&line, &line_asize, in) != -1) {
307                 conf_lineno++;
308                 sym = NULL;
309                 if (line[0] == '#') {
310                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
311                                 continue;
312                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
313                         if (!p)
314                                 continue;
315                         *p++ = 0;
316                         if (strncmp(p, "is not set", 10))
317                                 continue;
318                         if (def == S_DEF_USER) {
319                                 sym = sym_find(line + 2 + strlen(CONFIG_));
320                                 if (!sym) {
321                                         sym_add_change_count(1);
322                                         goto setsym;
323                                 }
324                         } else {
325                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
326                                 if (sym->type == S_UNKNOWN)
327                                         sym->type = S_BOOLEAN;
328                         }
329                         if (sym->flags & def_flags) {
330                                 conf_warning("override: reassigning to symbol %s", sym->name);
331                         }
332                         switch (sym->type) {
333                         case S_BOOLEAN:
334                         case S_TRISTATE:
335                                 sym->def[def].tri = no;
336                                 sym->flags |= def_flags;
337                                 break;
338                         default:
339                                 ;
340                         }
341                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
342                         p = strchr(line + strlen(CONFIG_), '=');
343                         if (!p)
344                                 continue;
345                         *p++ = 0;
346                         p2 = strchr(p, '\n');
347                         if (p2) {
348                                 *p2-- = 0;
349                                 if (*p2 == '\r')
350                                         *p2 = 0;
351                         }
352                         if (def == S_DEF_USER) {
353                                 sym = sym_find(line + strlen(CONFIG_));
354                                 if (!sym) {
355                                         sym_add_change_count(1);
356                                         goto setsym;
357                                 }
358                         } else {
359                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
360                                 if (sym->type == S_UNKNOWN)
361                                         sym->type = S_OTHER;
362                         }
363                         if (sym->flags & def_flags) {
364                                 conf_warning("override: reassigning to symbol %s", sym->name);
365                         }
366                         if (conf_set_sym_val(sym, def, def_flags, p))
367                                 continue;
368                 } else {
369                         if (line[0] != '\r' && line[0] != '\n')
370                                 conf_warning("unexpected data");
371                         continue;
372                 }
373 setsym:
374                 if (sym && sym_is_choice_value(sym)) {
375                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
376                         switch (sym->def[def].tri) {
377                         case no:
378                                 break;
379                         case mod:
380                                 if (cs->def[def].tri == yes) {
381                                         conf_warning("%s creates inconsistent choice state", sym->name);
382                                         cs->flags &= ~def_flags;
383                                 }
384                                 break;
385                         case yes:
386                                 if (cs->def[def].tri != no)
387                                         conf_warning("override: %s changes choice state", sym->name);
388                                 cs->def[def].val = sym;
389                                 break;
390                         }
391                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
392                 }
393         }
394         free(line);
395         fclose(in);
396
397         if (modules_sym)
398                 sym_calc_value(modules_sym);
399         return 0;
400 }
401
402 int conf_read(const char *name)
403 {
404         struct symbol *sym;
405         int i;
406
407         sym_set_change_count(0);
408
409         if (conf_read_simple(name, S_DEF_USER))
410                 return 1;
411
412         for_all_symbols(i, sym) {
413                 sym_calc_value(sym);
414                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
415                         continue;
416                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
417                         /* check that calculated value agrees with saved value */
418                         switch (sym->type) {
419                         case S_BOOLEAN:
420                         case S_TRISTATE:
421                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
422                                         break;
423                                 if (!sym_is_choice(sym))
424                                         continue;
425                                 /* fall through */
426                         default:
427                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
428                                         continue;
429                                 break;
430                         }
431                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
432                         /* no previous value and not saved */
433                         continue;
434                 conf_unsaved++;
435                 /* maybe print value in verbose mode... */
436         }
437
438         for_all_symbols(i, sym) {
439                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
440                         /* Reset values of generates values, so they'll appear
441                          * as new, if they should become visible, but that
442                          * doesn't quite work if the Kconfig and the saved
443                          * configuration disagree.
444                          */
445                         if (sym->visible == no && !conf_unsaved)
446                                 sym->flags &= ~SYMBOL_DEF_USER;
447                         switch (sym->type) {
448                         case S_STRING:
449                         case S_INT:
450                         case S_HEX:
451                                 /* Reset a string value if it's out of range */
452                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
453                                         break;
454                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
455                                 conf_unsaved++;
456                                 break;
457                         default:
458                                 break;
459                         }
460                 }
461         }
462
463         sym_add_change_count(conf_warnings || conf_unsaved);
464
465         return 0;
466 }
467
468 /*
469  * Kconfig configuration printer
470  *
471  * This printer is used when generating the resulting configuration after
472  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
473  * passing a non-NULL argument to the printer.
474  *
475  */
476 static void
477 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
478 {
479
480         switch (sym->type) {
481         case S_BOOLEAN:
482         case S_TRISTATE:
483                 if (*value == 'n') {
484                         bool skip_unset = (arg != NULL);
485
486                         if (!skip_unset)
487                                 fprintf(fp, "# %s%s is not set\n",
488                                     CONFIG_, sym->name);
489                         return;
490                 }
491                 break;
492         default:
493                 break;
494         }
495
496         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
497 }
498
499 static void
500 kconfig_print_comment(FILE *fp, const char *value, void *arg)
501 {
502         const char *p = value;
503         size_t l;
504
505         for (;;) {
506                 l = strcspn(p, "\n");
507                 fprintf(fp, "#");
508                 if (l) {
509                         fprintf(fp, " ");
510                         xfwrite(p, l, 1, fp);
511                         p += l;
512                 }
513                 fprintf(fp, "\n");
514                 if (*p++ == '\0')
515                         break;
516         }
517 }
518
519 static struct conf_printer kconfig_printer_cb =
520 {
521         .print_symbol = kconfig_print_symbol,
522         .print_comment = kconfig_print_comment,
523 };
524
525 /*
526  * Header printer
527  *
528  * This printer is used when generating the `include/generated/autoconf.h' file.
529  */
530 static void
531 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
532 {
533
534         switch (sym->type) {
535         case S_BOOLEAN:
536         case S_TRISTATE: {
537                 const char *suffix = "";
538
539                 switch (*value) {
540                 case 'n':
541                         break;
542                 case 'm':
543                         suffix = "_MODULE";
544                         /* fall through */
545                 default:
546                         fprintf(fp, "#define %s%s%s 1\n",
547                             CONFIG_, sym->name, suffix);
548                 }
549                 break;
550         }
551         case S_HEX: {
552                 const char *prefix = "";
553
554                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
555                         prefix = "0x";
556                 fprintf(fp, "#define %s%s %s%s\n",
557                     CONFIG_, sym->name, prefix, value);
558                 break;
559         }
560         case S_STRING:
561         case S_INT:
562                 fprintf(fp, "#define %s%s %s\n",
563                     CONFIG_, sym->name, value);
564                 break;
565         default:
566                 break;
567         }
568
569 }
570
571 static void
572 header_print_comment(FILE *fp, const char *value, void *arg)
573 {
574         const char *p = value;
575         size_t l;
576
577         fprintf(fp, "/*\n");
578         for (;;) {
579                 l = strcspn(p, "\n");
580                 fprintf(fp, " *");
581                 if (l) {
582                         fprintf(fp, " ");
583                         xfwrite(p, l, 1, fp);
584                         p += l;
585                 }
586                 fprintf(fp, "\n");
587                 if (*p++ == '\0')
588                         break;
589         }
590         fprintf(fp, " */\n");
591 }
592
593 static struct conf_printer header_printer_cb =
594 {
595         .print_symbol = header_print_symbol,
596         .print_comment = header_print_comment,
597 };
598
599 /*
600  * Tristate printer
601  *
602  * This printer is used when generating the `include/config/tristate.conf' file.
603  */
604 static void
605 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
606 {
607
608         if (sym->type == S_TRISTATE && *value != 'n')
609                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
610 }
611
612 static struct conf_printer tristate_printer_cb =
613 {
614         .print_symbol = tristate_print_symbol,
615         .print_comment = kconfig_print_comment,
616 };
617
618 static void conf_write_symbol(FILE *fp, struct symbol *sym,
619                               struct conf_printer *printer, void *printer_arg)
620 {
621         const char *str;
622
623         switch (sym->type) {
624         case S_OTHER:
625         case S_UNKNOWN:
626                 break;
627         case S_STRING:
628                 str = sym_get_string_value(sym);
629                 str = sym_escape_string_value(str);
630                 printer->print_symbol(fp, sym, str, printer_arg);
631                 free((void *)str);
632                 break;
633         default:
634                 str = sym_get_string_value(sym);
635                 printer->print_symbol(fp, sym, str, printer_arg);
636         }
637 }
638
639 static void
640 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
641 {
642         char buf[256];
643
644         snprintf(buf, sizeof(buf),
645             "\n"
646             "Automatically generated file; DO NOT EDIT.\n"
647             "%s\n",
648             rootmenu.prompt->text);
649
650         printer->print_comment(fp, buf, printer_arg);
651 }
652
653 /*
654  * Write out a minimal config.
655  * All values that has default values are skipped as this is redundant.
656  */
657 int conf_write_defconfig(const char *filename)
658 {
659         struct symbol *sym;
660         struct menu *menu;
661         FILE *out;
662
663         out = fopen(filename, "w");
664         if (!out)
665                 return 1;
666
667         sym_clear_all_valid();
668
669         /* Traverse all menus to find all relevant symbols */
670         menu = rootmenu.list;
671
672         while (menu != NULL)
673         {
674                 sym = menu->sym;
675                 if (sym == NULL) {
676                         if (!menu_is_visible(menu))
677                                 goto next_menu;
678                 } else if (!sym_is_choice(sym)) {
679                         sym_calc_value(sym);
680                         if (!(sym->flags & SYMBOL_WRITE))
681                                 goto next_menu;
682                         sym->flags &= ~SYMBOL_WRITE;
683                         /* If we cannot change the symbol - skip */
684                         if (!sym_is_changable(sym))
685                                 goto next_menu;
686                         /* If symbol equals to default value - skip */
687                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
688                                 goto next_menu;
689
690                         /*
691                          * If symbol is a choice value and equals to the
692                          * default for a choice - skip.
693                          * But only if value is bool and equal to "y" and
694                          * choice is not "optional".
695                          * (If choice is "optional" then all values can be "n")
696                          */
697                         if (sym_is_choice_value(sym)) {
698                                 struct symbol *cs;
699                                 struct symbol *ds;
700
701                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
702                                 ds = sym_choice_default(cs);
703                                 if (!sym_is_optional(cs) && sym == ds) {
704                                         if ((sym->type == S_BOOLEAN) &&
705                                             sym_get_tristate_value(sym) == yes)
706                                                 goto next_menu;
707                                 }
708                         }
709                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
710                 }
711 next_menu:
712                 if (menu->list != NULL) {
713                         menu = menu->list;
714                 }
715                 else if (menu->next != NULL) {
716                         menu = menu->next;
717                 } else {
718                         while ((menu = menu->parent)) {
719                                 if (menu->next != NULL) {
720                                         menu = menu->next;
721                                         break;
722                                 }
723                         }
724                 }
725         }
726         fclose(out);
727         return 0;
728 }
729
730 int conf_write(const char *name)
731 {
732         FILE *out;
733         struct symbol *sym;
734         struct menu *menu;
735         const char *basename;
736         const char *str;
737         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
738         char *env;
739
740         dirname[0] = 0;
741         if (name && name[0]) {
742                 struct stat st;
743                 char *slash;
744
745                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
746                         strcpy(dirname, name);
747                         strcat(dirname, "/");
748                         basename = conf_get_configname();
749                 } else if ((slash = strrchr(name, '/'))) {
750                         int size = slash - name + 1;
751                         memcpy(dirname, name, size);
752                         dirname[size] = 0;
753                         if (slash[1])
754                                 basename = slash + 1;
755                         else
756                                 basename = conf_get_configname();
757                 } else
758                         basename = name;
759         } else
760                 basename = conf_get_configname();
761
762         sprintf(newname, "%s%s", dirname, basename);
763         env = getenv("KCONFIG_OVERWRITECONFIG");
764         if (!env || !*env) {
765                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
766                 out = fopen(tmpname, "w");
767         } else {
768                 *tmpname = 0;
769                 out = fopen(newname, "w");
770         }
771         if (!out)
772                 return 1;
773
774         conf_write_heading(out, &kconfig_printer_cb, NULL);
775
776         if (!conf_get_changed())
777                 sym_clear_all_valid();
778
779         menu = rootmenu.list;
780         while (menu) {
781                 sym = menu->sym;
782                 if (!sym) {
783                         if (!menu_is_visible(menu))
784                                 goto next;
785                         str = menu_get_prompt(menu);
786                         fprintf(out, "\n"
787                                      "#\n"
788                                      "# %s\n"
789                                      "#\n", str);
790                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
791                         sym_calc_value(sym);
792                         if (!(sym->flags & SYMBOL_WRITE))
793                                 goto next;
794                         sym->flags &= ~SYMBOL_WRITE;
795
796                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
797                 }
798
799 next:
800                 if (menu->list) {
801                         menu = menu->list;
802                         continue;
803                 }
804                 if (menu->next)
805                         menu = menu->next;
806                 else while ((menu = menu->parent)) {
807                         if (menu->next) {
808                                 menu = menu->next;
809                                 break;
810                         }
811                 }
812         }
813         fclose(out);
814
815         if (*tmpname) {
816                 strcat(dirname, basename);
817                 strcat(dirname, ".old");
818                 rename(newname, dirname);
819                 if (rename(tmpname, newname))
820                         return 1;
821         }
822
823         conf_message(_("configuration written to %s"), newname);
824
825         sym_set_change_count(0);
826
827         return 0;
828 }
829
830 static int conf_split_config(void)
831 {
832         const char *name;
833         char path[PATH_MAX+1];
834         char *s, *d, c;
835         struct symbol *sym;
836         struct stat sb;
837         int res, i, fd;
838
839         name = conf_get_autoconfig_name();
840         conf_read_simple(name, S_DEF_AUTO);
841
842         if (chdir("include/config"))
843                 return 1;
844
845         res = 0;
846         for_all_symbols(i, sym) {
847                 sym_calc_value(sym);
848                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
849                         continue;
850                 if (sym->flags & SYMBOL_WRITE) {
851                         if (sym->flags & SYMBOL_DEF_AUTO) {
852                                 /*
853                                  * symbol has old and new value,
854                                  * so compare them...
855                                  */
856                                 switch (sym->type) {
857                                 case S_BOOLEAN:
858                                 case S_TRISTATE:
859                                         if (sym_get_tristate_value(sym) ==
860                                             sym->def[S_DEF_AUTO].tri)
861                                                 continue;
862                                         break;
863                                 case S_STRING:
864                                 case S_HEX:
865                                 case S_INT:
866                                         if (!strcmp(sym_get_string_value(sym),
867                                                     sym->def[S_DEF_AUTO].val))
868                                                 continue;
869                                         break;
870                                 default:
871                                         break;
872                                 }
873                         } else {
874                                 /*
875                                  * If there is no old value, only 'no' (unset)
876                                  * is allowed as new value.
877                                  */
878                                 switch (sym->type) {
879                                 case S_BOOLEAN:
880                                 case S_TRISTATE:
881                                         if (sym_get_tristate_value(sym) == no)
882                                                 continue;
883                                         break;
884                                 default:
885                                         break;
886                                 }
887                         }
888                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
889                         /* There is neither an old nor a new value. */
890                         continue;
891                 /* else
892                  *      There is an old value, but no new value ('no' (unset)
893                  *      isn't saved in auto.conf, so the old value is always
894                  *      different from 'no').
895                  */
896
897                 /* Replace all '_' and append ".h" */
898                 s = sym->name;
899                 d = path;
900                 while ((c = *s++)) {
901                         c = tolower(c);
902                         *d++ = (c == '_') ? '/' : c;
903                 }
904                 strcpy(d, ".h");
905
906                 /* Assume directory path already exists. */
907                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
908                 if (fd == -1) {
909                         if (errno != ENOENT) {
910                                 res = 1;
911                                 break;
912                         }
913                         /*
914                          * Create directory components,
915                          * unless they exist already.
916                          */
917                         d = path;
918                         while ((d = strchr(d, '/'))) {
919                                 *d = 0;
920                                 if (stat(path, &sb) && mkdir(path, 0755)) {
921                                         res = 1;
922                                         goto out;
923                                 }
924                                 *d++ = '/';
925                         }
926                         /* Try it again. */
927                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
928                         if (fd == -1) {
929                                 res = 1;
930                                 break;
931                         }
932                 }
933                 close(fd);
934         }
935 out:
936         if (chdir("../.."))
937                 return 1;
938
939         return res;
940 }
941
942 int conf_write_autoconf(void)
943 {
944         struct symbol *sym;
945         const char *name;
946         FILE *out, *tristate, *out_h;
947         int i;
948
949         sym_clear_all_valid();
950
951         file_write_dep("include/config/auto.conf.cmd");
952
953         if (conf_split_config())
954                 return 1;
955
956         out = fopen(".tmpconfig", "w");
957         if (!out)
958                 return 1;
959
960         tristate = fopen(".tmpconfig_tristate", "w");
961         if (!tristate) {
962                 fclose(out);
963                 return 1;
964         }
965
966         out_h = fopen(".tmpconfig.h", "w");
967         if (!out_h) {
968                 fclose(out);
969                 fclose(tristate);
970                 return 1;
971         }
972
973         conf_write_heading(out, &kconfig_printer_cb, NULL);
974
975         conf_write_heading(tristate, &tristate_printer_cb, NULL);
976
977         conf_write_heading(out_h, &header_printer_cb, NULL);
978
979         for_all_symbols(i, sym) {
980                 sym_calc_value(sym);
981                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
982                         continue;
983
984                 /* write symbol to auto.conf, tristate and header files */
985                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
986
987                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
988
989                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
990         }
991         fclose(out);
992         fclose(tristate);
993         fclose(out_h);
994
995         name = getenv("KCONFIG_AUTOHEADER");
996         if (!name)
997                 name = "include/generated/autoconf.h";
998         if (rename(".tmpconfig.h", name))
999                 return 1;
1000         name = getenv("KCONFIG_TRISTATE");
1001         if (!name)
1002                 name = "include/config/tristate.conf";
1003         if (rename(".tmpconfig_tristate", name))
1004                 return 1;
1005         name = conf_get_autoconfig_name();
1006         /*
1007          * This must be the last step, kbuild has a dependency on auto.conf
1008          * and this marks the successful completion of the previous steps.
1009          */
1010         if (rename(".tmpconfig", name))
1011                 return 1;
1012
1013         return 0;
1014 }
1015
1016 static int sym_change_count;
1017 static void (*conf_changed_callback)(void);
1018
1019 void sym_set_change_count(int count)
1020 {
1021         int _sym_change_count = sym_change_count;
1022         sym_change_count = count;
1023         if (conf_changed_callback &&
1024             (bool)_sym_change_count != (bool)count)
1025                 conf_changed_callback();
1026 }
1027
1028 void sym_add_change_count(int count)
1029 {
1030         sym_set_change_count(count + sym_change_count);
1031 }
1032
1033 bool conf_get_changed(void)
1034 {
1035         return sym_change_count;
1036 }
1037
1038 void conf_set_changed_callback(void (*fn)(void))
1039 {
1040         conf_changed_callback = fn;
1041 }
1042
1043 static void randomize_choice_values(struct symbol *csym)
1044 {
1045         struct property *prop;
1046         struct symbol *sym;
1047         struct expr *e;
1048         int cnt, def;
1049
1050         /*
1051          * If choice is mod then we may have more items selected
1052          * and if no then no-one.
1053          * In both cases stop.
1054          */
1055         if (csym->curr.tri != yes)
1056                 return;
1057
1058         prop = sym_get_choice_prop(csym);
1059
1060         /* count entries in choice block */
1061         cnt = 0;
1062         expr_list_for_each_sym(prop->expr, e, sym)
1063                 cnt++;
1064
1065         /*
1066          * find a random value and set it to yes,
1067          * set the rest to no so we have only one set
1068          */
1069         def = (rand() % cnt);
1070
1071         cnt = 0;
1072         expr_list_for_each_sym(prop->expr, e, sym) {
1073                 if (def == cnt++) {
1074                         sym->def[S_DEF_USER].tri = yes;
1075                         csym->def[S_DEF_USER].val = sym;
1076                 }
1077                 else {
1078                         sym->def[S_DEF_USER].tri = no;
1079                 }
1080         }
1081         csym->flags |= SYMBOL_DEF_USER;
1082         /* clear VALID to get value calculated */
1083         csym->flags &= ~(SYMBOL_VALID);
1084 }
1085
1086 static void set_all_choice_values(struct symbol *csym)
1087 {
1088         struct property *prop;
1089         struct symbol *sym;
1090         struct expr *e;
1091
1092         prop = sym_get_choice_prop(csym);
1093
1094         /*
1095          * Set all non-assinged choice values to no
1096          */
1097         expr_list_for_each_sym(prop->expr, e, sym) {
1098                 if (!sym_has_value(sym))
1099                         sym->def[S_DEF_USER].tri = no;
1100         }
1101         csym->flags |= SYMBOL_DEF_USER;
1102         /* clear VALID to get value calculated */
1103         csym->flags &= ~(SYMBOL_VALID);
1104 }
1105
1106 void conf_set_all_new_symbols(enum conf_def_mode mode)
1107 {
1108         struct symbol *sym, *csym;
1109         int i, cnt;
1110
1111         for_all_symbols(i, sym) {
1112                 if (sym_has_value(sym))
1113                         continue;
1114                 switch (sym_get_type(sym)) {
1115                 case S_BOOLEAN:
1116                 case S_TRISTATE:
1117                         switch (mode) {
1118                         case def_yes:
1119                                 sym->def[S_DEF_USER].tri = yes;
1120                                 break;
1121                         case def_mod:
1122                                 sym->def[S_DEF_USER].tri = mod;
1123                                 break;
1124                         case def_no:
1125                                 sym->def[S_DEF_USER].tri = no;
1126                                 break;
1127                         case def_random:
1128                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1129                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1130                                 break;
1131                         default:
1132                                 continue;
1133                         }
1134                         if (!(sym_is_choice(sym) && mode == def_random))
1135                                 sym->flags |= SYMBOL_DEF_USER;
1136                         break;
1137                 default:
1138                         break;
1139                 }
1140
1141         }
1142
1143         sym_clear_all_valid();
1144
1145         /*
1146          * We have different type of choice blocks.
1147          * If curr.tri equals to mod then we can select several
1148          * choice symbols in one block.
1149          * In this case we do nothing.
1150          * If curr.tri equals yes then only one symbol can be
1151          * selected in a choice block and we set it to yes,
1152          * and the rest to no.
1153          */
1154         for_all_symbols(i, csym) {
1155                 if (sym_has_value(csym) || !sym_is_choice(csym))
1156                         continue;
1157
1158                 sym_calc_value(csym);
1159                 if (mode == def_random)
1160                         randomize_choice_values(csym);
1161                 else
1162                         set_all_choice_values(csym);
1163         }
1164 }