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TOMOYO Linux Cross Reference
Linux/scripts/kconfig/confdata.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 struct conf_printer {
 20         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
 21         void (*print_comment)(FILE *, const char *, void *);
 22 };
 23 
 24 static void conf_warning(const char *fmt, ...)
 25         __attribute__ ((format (printf, 1, 2)));
 26 
 27 static void conf_message(const char *fmt, ...)
 28         __attribute__ ((format (printf, 1, 2)));
 29 
 30 static const char *conf_filename;
 31 static int conf_lineno, conf_warnings, conf_unsaved;
 32 
 33 const char conf_defname[] = "arch/$ARCH/defconfig";
 34 
 35 static void conf_warning(const char *fmt, ...)
 36 {
 37         va_list ap;
 38         va_start(ap, fmt);
 39         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
 40         vfprintf(stderr, fmt, ap);
 41         fprintf(stderr, "\n");
 42         va_end(ap);
 43         conf_warnings++;
 44 }
 45 
 46 static void conf_default_message_callback(const char *fmt, va_list ap)
 47 {
 48         printf("#\n# ");
 49         vprintf(fmt, ap);
 50         printf("\n#\n");
 51 }
 52 
 53 static void (*conf_message_callback) (const char *fmt, va_list ap) =
 54         conf_default_message_callback;
 55 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
 56 {
 57         conf_message_callback = fn;
 58 }
 59 
 60 static void conf_message(const char *fmt, ...)
 61 {
 62         va_list ap;
 63 
 64         va_start(ap, fmt);
 65         if (conf_message_callback)
 66                 conf_message_callback(fmt, ap);
 67         va_end(ap);
 68 }
 69 
 70 const char *conf_get_configname(void)
 71 {
 72         char *name = getenv("KCONFIG_CONFIG");
 73 
 74         return name ? name : ".config";
 75 }
 76 
 77 const char *conf_get_autoconfig_name(void)
 78 {
 79         char *name = getenv("KCONFIG_AUTOCONFIG");
 80 
 81         return name ? name : "include/config/auto.conf";
 82 }
 83 
 84 static char *conf_expand_value(const char *in)
 85 {
 86         struct symbol *sym;
 87         const char *src;
 88         static char res_value[SYMBOL_MAXLENGTH];
 89         char *dst, name[SYMBOL_MAXLENGTH];
 90 
 91         res_value[0] = 0;
 92         dst = name;
 93         while ((src = strchr(in, '$'))) {
 94                 strncat(res_value, in, src - in);
 95                 src++;
 96                 dst = name;
 97                 while (isalnum(*src) || *src == '_')
 98                         *dst++ = *src++;
 99                 *dst = 0;
100                 sym = sym_lookup(name, 0);
101                 sym_calc_value(sym);
102                 strcat(res_value, sym_get_string_value(sym));
103                 in = src;
104         }
105         strcat(res_value, in);
106 
107         return res_value;
108 }
109 
110 char *conf_get_default_confname(void)
111 {
112         struct stat buf;
113         static char fullname[PATH_MAX+1];
114         char *env, *name;
115 
116         name = conf_expand_value(conf_defname);
117         env = getenv(SRCTREE);
118         if (env) {
119                 sprintf(fullname, "%s/%s", env, name);
120                 if (!stat(fullname, &buf))
121                         return fullname;
122         }
123         return name;
124 }
125 
126 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
127 {
128         char *p2;
129 
130         switch (sym->type) {
131         case S_TRISTATE:
132                 if (p[0] == 'm') {
133                         sym->def[def].tri = mod;
134                         sym->flags |= def_flags;
135                         break;
136                 }
137                 /* fall through */
138         case S_BOOLEAN:
139                 if (p[0] == 'y') {
140                         sym->def[def].tri = yes;
141                         sym->flags |= def_flags;
142                         break;
143                 }
144                 if (p[0] == 'n') {
145                         sym->def[def].tri = no;
146                         sym->flags |= def_flags;
147                         break;
148                 }
149                 if (def != S_DEF_AUTO)
150                         conf_warning("symbol value '%s' invalid for %s",
151                                      p, sym->name);
152                 return 1;
153         case S_OTHER:
154                 if (*p != '"') {
155                         for (p2 = p; *p2 && !isspace(*p2); p2++)
156                                 ;
157                         sym->type = S_STRING;
158                         goto done;
159                 }
160                 /* fall through */
161         case S_STRING:
162                 if (*p++ != '"')
163                         break;
164                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
165                         if (*p2 == '"') {
166                                 *p2 = 0;
167                                 break;
168                         }
169                         memmove(p2, p2 + 1, strlen(p2));
170                 }
171                 if (!p2) {
172                         if (def != S_DEF_AUTO)
173                                 conf_warning("invalid string found");
174                         return 1;
175                 }
176                 /* fall through */
177         case S_INT:
178         case S_HEX:
179         done:
180                 if (sym_string_valid(sym, p)) {
181                         sym->def[def].val = strdup(p);
182                         sym->flags |= def_flags;
183                 } else {
184                         if (def != S_DEF_AUTO)
185                                 conf_warning("symbol value '%s' invalid for %s",
186                                              p, sym->name);
187                         return 1;
188                 }
189                 break;
190         default:
191                 ;
192         }
193         return 0;
194 }
195 
196 #define LINE_GROWTH 16
197 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
198 {
199         char *nline;
200         size_t new_size = slen + 1;
201         if (new_size > *n) {
202                 new_size += LINE_GROWTH - 1;
203                 new_size *= 2;
204                 nline = realloc(*lineptr, new_size);
205                 if (!nline)
206                         return -1;
207 
208                 *lineptr = nline;
209                 *n = new_size;
210         }
211 
212         (*lineptr)[slen] = c;
213 
214         return 0;
215 }
216 
217 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
218 {
219         char *line = *lineptr;
220         size_t slen = 0;
221 
222         for (;;) {
223                 int c = getc(stream);
224 
225                 switch (c) {
226                 case '\n':
227                         if (add_byte(c, &line, slen, n) < 0)
228                                 goto e_out;
229                         slen++;
230                         /* fall through */
231                 case EOF:
232                         if (add_byte('\0', &line, slen, n) < 0)
233                                 goto e_out;
234                         *lineptr = line;
235                         if (slen == 0)
236                                 return -1;
237                         return slen;
238                 default:
239                         if (add_byte(c, &line, slen, n) < 0)
240                                 goto e_out;
241                         slen++;
242                 }
243         }
244 
245 e_out:
246         line[slen-1] = '\0';
247         *lineptr = line;
248         return -1;
249 }
250 
251 int conf_read_simple(const char *name, int def)
252 {
253         FILE *in = NULL;
254         char   *line = NULL;
255         size_t  line_asize = 0;
256         char *p, *p2;
257         struct symbol *sym;
258         int i, def_flags;
259 
260         if (name) {
261                 in = zconf_fopen(name);
262         } else {
263                 struct property *prop;
264 
265                 name = conf_get_configname();
266                 in = zconf_fopen(name);
267                 if (in)
268                         goto load;
269                 sym_add_change_count(1);
270                 if (!sym_defconfig_list)
271                         return 1;
272 
273                 for_all_defaults(sym_defconfig_list, prop) {
274                         if (expr_calc_value(prop->visible.expr) == no ||
275                             prop->expr->type != E_SYMBOL)
276                                 continue;
277                         name = conf_expand_value(prop->expr->left.sym->name);
278                         in = zconf_fopen(name);
279                         if (in) {
280                                 conf_message(_("using defaults found in %s"),
281                                          name);
282                                 goto load;
283                         }
284                 }
285         }
286         if (!in)
287                 return 1;
288 
289 load:
290         conf_filename = name;
291         conf_lineno = 0;
292         conf_warnings = 0;
293         conf_unsaved = 0;
294 
295         def_flags = SYMBOL_DEF << def;
296         for_all_symbols(i, sym) {
297                 sym->flags |= SYMBOL_CHANGED;
298                 sym->flags &= ~(def_flags|SYMBOL_VALID);
299                 if (sym_is_choice(sym))
300                         sym->flags |= def_flags;
301                 switch (sym->type) {
302                 case S_INT:
303                 case S_HEX:
304                 case S_STRING:
305                         if (sym->def[def].val)
306                                 free(sym->def[def].val);
307                         /* fall through */
308                 default:
309                         sym->def[def].val = NULL;
310                         sym->def[def].tri = no;
311                 }
312         }
313 
314         while (compat_getline(&line, &line_asize, in) != -1) {
315                 conf_lineno++;
316                 sym = NULL;
317                 if (line[0] == '#') {
318                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
319                                 continue;
320                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
321                         if (!p)
322                                 continue;
323                         *p++ = 0;
324                         if (strncmp(p, "is not set", 10))
325                                 continue;
326                         if (def == S_DEF_USER) {
327                                 sym = sym_find(line + 2 + strlen(CONFIG_));
328                                 if (!sym) {
329                                         sym_add_change_count(1);
330                                         goto setsym;
331                                 }
332                         } else {
333                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
334                                 if (sym->type == S_UNKNOWN)
335                                         sym->type = S_BOOLEAN;
336                         }
337                         if (sym->flags & def_flags) {
338                                 conf_warning("override: reassigning to symbol %s", sym->name);
339                         }
340                         switch (sym->type) {
341                         case S_BOOLEAN:
342                         case S_TRISTATE:
343                                 sym->def[def].tri = no;
344                                 sym->flags |= def_flags;
345                                 break;
346                         default:
347                                 ;
348                         }
349                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
350                         p = strchr(line + strlen(CONFIG_), '=');
351                         if (!p)
352                                 continue;
353                         *p++ = 0;
354                         p2 = strchr(p, '\n');
355                         if (p2) {
356                                 *p2-- = 0;
357                                 if (*p2 == '\r')
358                                         *p2 = 0;
359                         }
360                         if (def == S_DEF_USER) {
361                                 sym = sym_find(line + strlen(CONFIG_));
362                                 if (!sym) {
363                                         sym_add_change_count(1);
364                                         goto setsym;
365                                 }
366                         } else {
367                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
368                                 if (sym->type == S_UNKNOWN)
369                                         sym->type = S_OTHER;
370                         }
371                         if (sym->flags & def_flags) {
372                                 conf_warning("override: reassigning to symbol %s", sym->name);
373                         }
374                         if (conf_set_sym_val(sym, def, def_flags, p))
375                                 continue;
376                 } else {
377                         if (line[0] != '\r' && line[0] != '\n')
378                                 conf_warning("unexpected data: %.*s",
379                                              (int)strcspn(line, "\r\n"), line);
380 
381                         continue;
382                 }
383 setsym:
384                 if (sym && sym_is_choice_value(sym)) {
385                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
386                         switch (sym->def[def].tri) {
387                         case no:
388                                 break;
389                         case mod:
390                                 if (cs->def[def].tri == yes) {
391                                         conf_warning("%s creates inconsistent choice state", sym->name);
392                                         cs->flags &= ~def_flags;
393                                 }
394                                 break;
395                         case yes:
396                                 if (cs->def[def].tri != no)
397                                         conf_warning("override: %s changes choice state", sym->name);
398                                 cs->def[def].val = sym;
399                                 break;
400                         }
401                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
402                 }
403         }
404         free(line);
405         fclose(in);
406         return 0;
407 }
408 
409 int conf_read(const char *name)
410 {
411         struct symbol *sym;
412         int i;
413 
414         sym_set_change_count(0);
415 
416         if (conf_read_simple(name, S_DEF_USER)) {
417                 sym_calc_value(modules_sym);
418                 return 1;
419         }
420 
421         sym_calc_value(modules_sym);
422 
423         for_all_symbols(i, sym) {
424                 sym_calc_value(sym);
425                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
426                         continue;
427                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
428                         /* check that calculated value agrees with saved value */
429                         switch (sym->type) {
430                         case S_BOOLEAN:
431                         case S_TRISTATE:
432                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
433                                         break;
434                                 if (!sym_is_choice(sym))
435                                         continue;
436                                 /* fall through */
437                         default:
438                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
439                                         continue;
440                                 break;
441                         }
442                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
443                         /* no previous value and not saved */
444                         continue;
445                 conf_unsaved++;
446                 /* maybe print value in verbose mode... */
447         }
448 
449         for_all_symbols(i, sym) {
450                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
451                         /* Reset values of generates values, so they'll appear
452                          * as new, if they should become visible, but that
453                          * doesn't quite work if the Kconfig and the saved
454                          * configuration disagree.
455                          */
456                         if (sym->visible == no && !conf_unsaved)
457                                 sym->flags &= ~SYMBOL_DEF_USER;
458                         switch (sym->type) {
459                         case S_STRING:
460                         case S_INT:
461                         case S_HEX:
462                                 /* Reset a string value if it's out of range */
463                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
464                                         break;
465                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
466                                 conf_unsaved++;
467                                 break;
468                         default:
469                                 break;
470                         }
471                 }
472         }
473 
474         sym_add_change_count(conf_warnings || conf_unsaved);
475 
476         return 0;
477 }
478 
479 /*
480  * Kconfig configuration printer
481  *
482  * This printer is used when generating the resulting configuration after
483  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
484  * passing a non-NULL argument to the printer.
485  *
486  */
487 static void
488 kconfig_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                 if (*value == 'n') {
495                         bool skip_unset = (arg != NULL);
496 
497                         if (!skip_unset)
498                                 fprintf(fp, "# %s%s is not set\n",
499                                     CONFIG_, sym->name);
500                         return;
501                 }
502                 break;
503         default:
504                 break;
505         }
506 
507         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
508 }
509 
510 static void
511 kconfig_print_comment(FILE *fp, const char *value, void *arg)
512 {
513         const char *p = value;
514         size_t l;
515 
516         for (;;) {
517                 l = strcspn(p, "\n");
518                 fprintf(fp, "#");
519                 if (l) {
520                         fprintf(fp, " ");
521                         xfwrite(p, l, 1, fp);
522                         p += l;
523                 }
524                 fprintf(fp, "\n");
525                 if (*p++ == '\0')
526                         break;
527         }
528 }
529 
530 static struct conf_printer kconfig_printer_cb =
531 {
532         .print_symbol = kconfig_print_symbol,
533         .print_comment = kconfig_print_comment,
534 };
535 
536 /*
537  * Header printer
538  *
539  * This printer is used when generating the `include/generated/autoconf.h' file.
540  */
541 static void
542 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
543 {
544 
545         switch (sym->type) {
546         case S_BOOLEAN:
547         case S_TRISTATE: {
548                 const char *suffix = "";
549 
550                 switch (*value) {
551                 case 'n':
552                         break;
553                 case 'm':
554                         suffix = "_MODULE";
555                         /* fall through */
556                 default:
557                         fprintf(fp, "#define %s%s%s 1\n",
558                             CONFIG_, sym->name, suffix);
559                 }
560                 break;
561         }
562         case S_HEX: {
563                 const char *prefix = "";
564 
565                 if (value[0] != '' || (value[1] != 'x' && value[1] != 'X'))
566                         prefix = "0x";
567                 fprintf(fp, "#define %s%s %s%s\n",
568                     CONFIG_, sym->name, prefix, value);
569                 break;
570         }
571         case S_STRING:
572         case S_INT:
573                 fprintf(fp, "#define %s%s %s\n",
574                     CONFIG_, sym->name, value);
575                 break;
576         default:
577                 break;
578         }
579 
580 }
581 
582 static void
583 header_print_comment(FILE *fp, const char *value, void *arg)
584 {
585         const char *p = value;
586         size_t l;
587 
588         fprintf(fp, "/*\n");
589         for (;;) {
590                 l = strcspn(p, "\n");
591                 fprintf(fp, " *");
592                 if (l) {
593                         fprintf(fp, " ");
594                         xfwrite(p, l, 1, fp);
595                         p += l;
596                 }
597                 fprintf(fp, "\n");
598                 if (*p++ == '\0')
599                         break;
600         }
601         fprintf(fp, " */\n");
602 }
603 
604 static struct conf_printer header_printer_cb =
605 {
606         .print_symbol = header_print_symbol,
607         .print_comment = header_print_comment,
608 };
609 
610 /*
611  * Tristate printer
612  *
613  * This printer is used when generating the `include/config/tristate.conf' file.
614  */
615 static void
616 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
617 {
618 
619         if (sym->type == S_TRISTATE && *value != 'n')
620                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
621 }
622 
623 static struct conf_printer tristate_printer_cb =
624 {
625         .print_symbol = tristate_print_symbol,
626         .print_comment = kconfig_print_comment,
627 };
628 
629 static void conf_write_symbol(FILE *fp, struct symbol *sym,
630                               struct conf_printer *printer, void *printer_arg)
631 {
632         const char *str;
633 
634         switch (sym->type) {
635         case S_OTHER:
636         case S_UNKNOWN:
637                 break;
638         case S_STRING:
639                 str = sym_get_string_value(sym);
640                 str = sym_escape_string_value(str);
641                 printer->print_symbol(fp, sym, str, printer_arg);
642                 free((void *)str);
643                 break;
644         default:
645                 str = sym_get_string_value(sym);
646                 printer->print_symbol(fp, sym, str, printer_arg);
647         }
648 }
649 
650 static void
651 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
652 {
653         char buf[256];
654 
655         snprintf(buf, sizeof(buf),
656             "\n"
657             "Automatically generated file; DO NOT EDIT.\n"
658             "%s\n",
659             rootmenu.prompt->text);
660 
661         printer->print_comment(fp, buf, printer_arg);
662 }
663 
664 /*
665  * Write out a minimal config.
666  * All values that has default values are skipped as this is redundant.
667  */
668 int conf_write_defconfig(const char *filename)
669 {
670         struct symbol *sym;
671         struct menu *menu;
672         FILE *out;
673 
674         out = fopen(filename, "w");
675         if (!out)
676                 return 1;
677 
678         sym_clear_all_valid();
679 
680         /* Traverse all menus to find all relevant symbols */
681         menu = rootmenu.list;
682 
683         while (menu != NULL)
684         {
685                 sym = menu->sym;
686                 if (sym == NULL) {
687                         if (!menu_is_visible(menu))
688                                 goto next_menu;
689                 } else if (!sym_is_choice(sym)) {
690                         sym_calc_value(sym);
691                         if (!(sym->flags & SYMBOL_WRITE))
692                                 goto next_menu;
693                         sym->flags &= ~SYMBOL_WRITE;
694                         /* If we cannot change the symbol - skip */
695                         if (!sym_is_changable(sym))
696                                 goto next_menu;
697                         /* If symbol equals to default value - skip */
698                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
699                                 goto next_menu;
700 
701                         /*
702                          * If symbol is a choice value and equals to the
703                          * default for a choice - skip.
704                          * But only if value is bool and equal to "y" and
705                          * choice is not "optional".
706                          * (If choice is "optional" then all values can be "n")
707                          */
708                         if (sym_is_choice_value(sym)) {
709                                 struct symbol *cs;
710                                 struct symbol *ds;
711 
712                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
713                                 ds = sym_choice_default(cs);
714                                 if (!sym_is_optional(cs) && sym == ds) {
715                                         if ((sym->type == S_BOOLEAN) &&
716                                             sym_get_tristate_value(sym) == yes)
717                                                 goto next_menu;
718                                 }
719                         }
720                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
721                 }
722 next_menu:
723                 if (menu->list != NULL) {
724                         menu = menu->list;
725                 }
726                 else if (menu->next != NULL) {
727                         menu = menu->next;
728                 } else {
729                         while ((menu = menu->parent)) {
730                                 if (menu->next != NULL) {
731                                         menu = menu->next;
732                                         break;
733                                 }
734                         }
735                 }
736         }
737         fclose(out);
738         return 0;
739 }
740 
741 int conf_write(const char *name)
742 {
743         FILE *out;
744         struct symbol *sym;
745         struct menu *menu;
746         const char *basename;
747         const char *str;
748         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
749         char *env;
750 
751         dirname[0] = 0;
752         if (name && name[0]) {
753                 struct stat st;
754                 char *slash;
755 
756                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
757                         strcpy(dirname, name);
758                         strcat(dirname, "/");
759                         basename = conf_get_configname();
760                 } else if ((slash = strrchr(name, '/'))) {
761                         int size = slash - name + 1;
762                         memcpy(dirname, name, size);
763                         dirname[size] = 0;
764                         if (slash[1])
765                                 basename = slash + 1;
766                         else
767                                 basename = conf_get_configname();
768                 } else
769                         basename = name;
770         } else
771                 basename = conf_get_configname();
772 
773         sprintf(newname, "%s%s", dirname, basename);
774         env = getenv("KCONFIG_OVERWRITECONFIG");
775         if (!env || !*env) {
776                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
777                 out = fopen(tmpname, "w");
778         } else {
779                 *tmpname = 0;
780                 out = fopen(newname, "w");
781         }
782         if (!out)
783                 return 1;
784 
785         conf_write_heading(out, &kconfig_printer_cb, NULL);
786 
787         if (!conf_get_changed())
788                 sym_clear_all_valid();
789 
790         menu = rootmenu.list;
791         while (menu) {
792                 sym = menu->sym;
793                 if (!sym) {
794                         if (!menu_is_visible(menu))
795                                 goto next;
796                         str = menu_get_prompt(menu);
797                         fprintf(out, "\n"
798                                      "#\n"
799                                      "# %s\n"
800                                      "#\n", str);
801                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
802                         sym_calc_value(sym);
803                         if (!(sym->flags & SYMBOL_WRITE))
804                                 goto next;
805                         sym->flags &= ~SYMBOL_WRITE;
806 
807                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
808                 }
809 
810 next:
811                 if (menu->list) {
812                         menu = menu->list;
813                         continue;
814                 }
815                 if (menu->next)
816                         menu = menu->next;
817                 else while ((menu = menu->parent)) {
818                         if (menu->next) {
819                                 menu = menu->next;
820                                 break;
821                         }
822                 }
823         }
824         fclose(out);
825 
826         if (*tmpname) {
827                 strcat(dirname, basename);
828                 strcat(dirname, ".old");
829                 rename(newname, dirname);
830                 if (rename(tmpname, newname))
831                         return 1;
832         }
833 
834         conf_message(_("configuration written to %s"), newname);
835 
836         sym_set_change_count(0);
837 
838         return 0;
839 }
840 
841 static int conf_split_config(void)
842 {
843         const char *name;
844         char path[PATH_MAX+1];
845         char *s, *d, c;
846         struct symbol *sym;
847         struct stat sb;
848         int res, i, fd;
849 
850         name = conf_get_autoconfig_name();
851         conf_read_simple(name, S_DEF_AUTO);
852         sym_calc_value(modules_sym);
853 
854         if (chdir("include/config"))
855                 return 1;
856 
857         res = 0;
858         for_all_symbols(i, sym) {
859                 sym_calc_value(sym);
860                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
861                         continue;
862                 if (sym->flags & SYMBOL_WRITE) {
863                         if (sym->flags & SYMBOL_DEF_AUTO) {
864                                 /*
865                                  * symbol has old and new value,
866                                  * so compare them...
867                                  */
868                                 switch (sym->type) {
869                                 case S_BOOLEAN:
870                                 case S_TRISTATE:
871                                         if (sym_get_tristate_value(sym) ==
872                                             sym->def[S_DEF_AUTO].tri)
873                                                 continue;
874                                         break;
875                                 case S_STRING:
876                                 case S_HEX:
877                                 case S_INT:
878                                         if (!strcmp(sym_get_string_value(sym),
879                                                     sym->def[S_DEF_AUTO].val))
880                                                 continue;
881                                         break;
882                                 default:
883                                         break;
884                                 }
885                         } else {
886                                 /*
887                                  * If there is no old value, only 'no' (unset)
888                                  * is allowed as new value.
889                                  */
890                                 switch (sym->type) {
891                                 case S_BOOLEAN:
892                                 case S_TRISTATE:
893                                         if (sym_get_tristate_value(sym) == no)
894                                                 continue;
895                                         break;
896                                 default:
897                                         break;
898                                 }
899                         }
900                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
901                         /* There is neither an old nor a new value. */
902                         continue;
903                 /* else
904                  *      There is an old value, but no new value ('no' (unset)
905                  *      isn't saved in auto.conf, so the old value is always
906                  *      different from 'no').
907                  */
908 
909                 /* Replace all '_' and append ".h" */
910                 s = sym->name;
911                 d = path;
912                 while ((c = *s++)) {
913                         c = tolower(c);
914                         *d++ = (c == '_') ? '/' : c;
915                 }
916                 strcpy(d, ".h");
917 
918                 /* Assume directory path already exists. */
919                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
920                 if (fd == -1) {
921                         if (errno != ENOENT) {
922                                 res = 1;
923                                 break;
924                         }
925                         /*
926                          * Create directory components,
927                          * unless they exist already.
928                          */
929                         d = path;
930                         while ((d = strchr(d, '/'))) {
931                                 *d = 0;
932                                 if (stat(path, &sb) && mkdir(path, 0755)) {
933                                         res = 1;
934                                         goto out;
935                                 }
936                                 *d++ = '/';
937                         }
938                         /* Try it again. */
939                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
940                         if (fd == -1) {
941                                 res = 1;
942                                 break;
943                         }
944                 }
945                 close(fd);
946         }
947 out:
948         if (chdir("../.."))
949                 return 1;
950 
951         return res;
952 }
953 
954 int conf_write_autoconf(void)
955 {
956         struct symbol *sym;
957         const char *name;
958         FILE *out, *tristate, *out_h;
959         int i;
960 
961         sym_clear_all_valid();
962 
963         file_write_dep("include/config/auto.conf.cmd");
964 
965         if (conf_split_config())
966                 return 1;
967 
968         out = fopen(".tmpconfig", "w");
969         if (!out)
970                 return 1;
971 
972         tristate = fopen(".tmpconfig_tristate", "w");
973         if (!tristate) {
974                 fclose(out);
975                 return 1;
976         }
977 
978         out_h = fopen(".tmpconfig.h", "w");
979         if (!out_h) {
980                 fclose(out);
981                 fclose(tristate);
982                 return 1;
983         }
984 
985         conf_write_heading(out, &kconfig_printer_cb, NULL);
986 
987         conf_write_heading(tristate, &tristate_printer_cb, NULL);
988 
989         conf_write_heading(out_h, &header_printer_cb, NULL);
990 
991         for_all_symbols(i, sym) {
992                 sym_calc_value(sym);
993                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
994                         continue;
995 
996                 /* write symbol to auto.conf, tristate and header files */
997                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
998 
999                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1000 
1001                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1002         }
1003         fclose(out);
1004         fclose(tristate);
1005         fclose(out_h);
1006 
1007         name = getenv("KCONFIG_AUTOHEADER");
1008         if (!name)
1009                 name = "include/generated/autoconf.h";
1010         if (rename(".tmpconfig.h", name))
1011                 return 1;
1012         name = getenv("KCONFIG_TRISTATE");
1013         if (!name)
1014                 name = "include/config/tristate.conf";
1015         if (rename(".tmpconfig_tristate", name))
1016                 return 1;
1017         name = conf_get_autoconfig_name();
1018         /*
1019          * This must be the last step, kbuild has a dependency on auto.conf
1020          * and this marks the successful completion of the previous steps.
1021          */
1022         if (rename(".tmpconfig", name))
1023                 return 1;
1024 
1025         return 0;
1026 }
1027 
1028 static int sym_change_count;
1029 static void (*conf_changed_callback)(void);
1030 
1031 void sym_set_change_count(int count)
1032 {
1033         int _sym_change_count = sym_change_count;
1034         sym_change_count = count;
1035         if (conf_changed_callback &&
1036             (bool)_sym_change_count != (bool)count)
1037                 conf_changed_callback();
1038 }
1039 
1040 void sym_add_change_count(int count)
1041 {
1042         sym_set_change_count(count + sym_change_count);
1043 }
1044 
1045 bool conf_get_changed(void)
1046 {
1047         return sym_change_count;
1048 }
1049 
1050 void conf_set_changed_callback(void (*fn)(void))
1051 {
1052         conf_changed_callback = fn;
1053 }
1054 
1055 static bool randomize_choice_values(struct symbol *csym)
1056 {
1057         struct property *prop;
1058         struct symbol *sym;
1059         struct expr *e;
1060         int cnt, def;
1061 
1062         /*
1063          * If choice is mod then we may have more items selected
1064          * and if no then no-one.
1065          * In both cases stop.
1066          */
1067         if (csym->curr.tri != yes)
1068                 return false;
1069 
1070         prop = sym_get_choice_prop(csym);
1071 
1072         /* count entries in choice block */
1073         cnt = 0;
1074         expr_list_for_each_sym(prop->expr, e, sym)
1075                 cnt++;
1076 
1077         /*
1078          * find a random value and set it to yes,
1079          * set the rest to no so we have only one set
1080          */
1081         def = (rand() % cnt);
1082 
1083         cnt = 0;
1084         expr_list_for_each_sym(prop->expr, e, sym) {
1085                 if (def == cnt++) {
1086                         sym->def[S_DEF_USER].tri = yes;
1087                         csym->def[S_DEF_USER].val = sym;
1088                 }
1089                 else {
1090                         sym->def[S_DEF_USER].tri = no;
1091                 }
1092                 sym->flags |= SYMBOL_DEF_USER;
1093                 /* clear VALID to get value calculated */
1094                 sym->flags &= ~SYMBOL_VALID;
1095         }
1096         csym->flags |= SYMBOL_DEF_USER;
1097         /* clear VALID to get value calculated */
1098         csym->flags &= ~(SYMBOL_VALID);
1099 
1100         return true;
1101 }
1102 
1103 void set_all_choice_values(struct symbol *csym)
1104 {
1105         struct property *prop;
1106         struct symbol *sym;
1107         struct expr *e;
1108 
1109         prop = sym_get_choice_prop(csym);
1110 
1111         /*
1112          * Set all non-assinged choice values to no
1113          */
1114         expr_list_for_each_sym(prop->expr, e, sym) {
1115                 if (!sym_has_value(sym))
1116                         sym->def[S_DEF_USER].tri = no;
1117         }
1118         csym->flags |= SYMBOL_DEF_USER;
1119         /* clear VALID to get value calculated */
1120         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1121 }
1122 
1123 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1124 {
1125         struct symbol *sym, *csym;
1126         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1127                                          * pty: probability of tristate = y
1128                                          * ptm: probability of tristate = m
1129                                          */
1130 
1131         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1132                                    * below, otherwise gcc whines about
1133                                    * -Wmaybe-uninitialized */
1134         if (mode == def_random) {
1135                 int n, p[3];
1136                 char *env = getenv("KCONFIG_PROBABILITY");
1137                 n = 0;
1138                 while( env && *env ) {
1139                         char *endp;
1140                         int tmp = strtol( env, &endp, 10 );
1141                         if( tmp >= 0 && tmp <= 100 ) {
1142                                 p[n++] = tmp;
1143                         } else {
1144                                 errno = ERANGE;
1145                                 perror( "KCONFIG_PROBABILITY" );
1146                                 exit( 1 );
1147                         }
1148                         env = (*endp == ':') ? endp+1 : endp;
1149                         if( n >=3 ) {
1150                                 break;
1151                         }
1152                 }
1153                 switch( n ) {
1154                 case 1:
1155                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1156                         break;
1157                 case 2:
1158                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1159                         break;
1160                 case 3:
1161                         pby = p[0]; pty = p[1]; ptm = p[2];
1162                         break;
1163                 }
1164 
1165                 if( pty+ptm > 100 ) {
1166                         errno = ERANGE;
1167                         perror( "KCONFIG_PROBABILITY" );
1168                         exit( 1 );
1169                 }
1170         }
1171         bool has_changed = false;
1172 
1173         for_all_symbols(i, sym) {
1174                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1175                         continue;
1176                 switch (sym_get_type(sym)) {
1177                 case S_BOOLEAN:
1178                 case S_TRISTATE:
1179                         has_changed = true;
1180                         switch (mode) {
1181                         case def_yes:
1182                                 sym->def[S_DEF_USER].tri = yes;
1183                                 break;
1184                         case def_mod:
1185                                 sym->def[S_DEF_USER].tri = mod;
1186                                 break;
1187                         case def_no:
1188                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1189                                         sym->def[S_DEF_USER].tri = yes;
1190                                 else
1191                                         sym->def[S_DEF_USER].tri = no;
1192                                 break;
1193                         case def_random:
1194                                 sym->def[S_DEF_USER].tri = no;
1195                                 cnt = rand() % 100;
1196                                 if (sym->type == S_TRISTATE) {
1197                                         if (cnt < pty)
1198                                                 sym->def[S_DEF_USER].tri = yes;
1199                                         else if (cnt < (pty+ptm))
1200                                                 sym->def[S_DEF_USER].tri = mod;
1201                                 } else if (cnt < pby)
1202                                         sym->def[S_DEF_USER].tri = yes;
1203                                 break;
1204                         default:
1205                                 continue;
1206                         }
1207                         if (!(sym_is_choice(sym) && mode == def_random))
1208                                 sym->flags |= SYMBOL_DEF_USER;
1209                         break;
1210                 default:
1211                         break;
1212                 }
1213 
1214         }
1215 
1216         sym_clear_all_valid();
1217 
1218         /*
1219          * We have different type of choice blocks.
1220          * If curr.tri equals to mod then we can select several
1221          * choice symbols in one block.
1222          * In this case we do nothing.
1223          * If curr.tri equals yes then only one symbol can be
1224          * selected in a choice block and we set it to yes,
1225          * and the rest to no.
1226          */
1227         if (mode != def_random) {
1228                 for_all_symbols(i, csym) {
1229                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1230                             sym_is_choice_value(csym))
1231                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1232                 }
1233         }
1234 
1235         for_all_symbols(i, csym) {
1236                 if (sym_has_value(csym) || !sym_is_choice(csym))
1237                         continue;
1238 
1239                 sym_calc_value(csym);
1240                 if (mode == def_random)
1241                         has_changed = randomize_choice_values(csym);
1242                 else {
1243                         set_all_choice_values(csym);
1244                         has_changed = true;
1245                 }
1246         }
1247 
1248         return has_changed;
1249 }
1250 

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