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 <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <time.h>
  14 #include <unistd.h>
  15
  16 #define LKC_DIRECT_LINK
  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         case S_BOOLEAN:
 132                 if (p[0] == 'y') {
 133                         sym->def[def].tri = yes;
 134                         sym->flags |= def_flags;
 135                         break;
 136                 }
 137                 if (p[0] == 'n') {
 138                         sym->def[def].tri = no;
 139                         sym->flags |= def_flags;
 140                         break;
 141                 }
 142                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 143                 break;
 144         case S_OTHER:
 145                 if (*p != '"') {
 146                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 147                                 ;
 148                         sym->type = S_STRING;
 149                         goto done;
 150                 }
 151         case S_STRING:
 152                 if (*p++ != '"')
 153                         break;
 154                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 155                         if (*p2 == '"') {
 156                                 *p2 = 0;
 157                                 break;
 158                         }
 159                         memmove(p2, p2 + 1, strlen(p2));
 160                 }
 161                 if (!p2) {
 162                         conf_warning("invalid string found");
 163                         return 1;
 164                 }
 165         case S_INT:
 166         case S_HEX:
 167         done:
 168                 if (sym_string_valid(sym, p)) {
 169                         sym->def[def].val = strdup(p);
 170                         sym->flags |= def_flags;
 171                 } else {
 172                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 173                         return 1;
 174                 }
 175                 break;
 176         default:
 177                 ;
 178         }
 179         return 0;
 180 }
 181
 182 int conf_read_simple(const char *name, int def)
 183 {
 184         FILE *in = NULL;
 185         char line[1024];
 186         char *p, *p2;
 187         struct symbol *sym;
 188         int i, def_flags;
 189
 190         if (name) {
 191                 in = zconf_fopen(name);
 192         } else {
 193                 struct property *prop;
 194
 195                 name = conf_get_configname();
 196                 in = zconf_fopen(name);
 197                 if (in)
 198                         goto load;
 199                 sym_add_change_count(1);
 200                 if (!sym_defconfig_list) {
 201                         if (modules_sym)
 202                                 sym_calc_value(modules_sym);
 203                         return 1;
 204                 }
 205
 206                 for_all_defaults(sym_defconfig_list, prop) {
 207                         if (expr_calc_value(prop->visible.expr) == no ||
 208                             prop->expr->type != E_SYMBOL)
 209                                 continue;
 210                         name = conf_expand_value(prop->expr->left.sym->name);
 211                         in = zconf_fopen(name);
 212                         if (in) {
 213                                 conf_message(_("using defaults found in %s"),
 214                                          name);
 215                                 goto load;
 216                         }
 217                 }
 218         }
 219         if (!in)
 220                 return 1;
 221
 222 load:
 223         conf_filename = name;
 224         conf_lineno = 0;
 225         conf_warnings = 0;
 226         conf_unsaved = 0;
 227
 228         def_flags = SYMBOL_DEF << def;
 229         for_all_symbols(i, sym) {
 230                 sym->flags |= SYMBOL_CHANGED;
 231                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 232                 if (sym_is_choice(sym))
 233                         sym->flags |= def_flags;
 234                 switch (sym->type) {
 235                 case S_INT:
 236                 case S_HEX:
 237                 case S_STRING:
 238                         if (sym->def[def].val)
 239                                 free(sym->def[def].val);
 240                 default:
 241                         sym->def[def].val = NULL;
 242                         sym->def[def].tri = no;
 243                 }
 244         }
 245
 246         while (fgets(line, sizeof(line), in)) {
 247                 conf_lineno++;
 248                 sym = NULL;
 249                 if (line[0] == '#') {
 250                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 251                                 continue;
 252                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 253                         if (!p)
 254                                 continue;
 255                         *p++ = 0;
 256                         if (strncmp(p, "is not set", 10))
 257                                 continue;
 258                         if (def == S_DEF_USER) {
 259                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 260                                 if (!sym) {
 261                                         sym_add_change_count(1);
 262                                         goto setsym;
 263                                 }
 264                         } else {
 265                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 266                                 if (sym->type == S_UNKNOWN)
 267                                         sym->type = S_BOOLEAN;
 268                         }
 269                         if (sym->flags & def_flags) {
 270                                 conf_warning("override: reassigning to symbol %s", sym->name);
 271                         }
 272                         switch (sym->type) {
 273                         case S_BOOLEAN:
 274                         case S_TRISTATE:
 275                                 sym->def[def].tri = no;
 276                                 sym->flags |= def_flags;
 277                                 break;
 278                         default:
 279                                 ;
 280                         }
 281                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 282                         p = strchr(line + strlen(CONFIG_), '=');
 283                         if (!p)
 284                                 continue;
 285                         *p++ = 0;
 286                         p2 = strchr(p, '\n');
 287                         if (p2) {
 288                                 *p2-- = 0;
 289                                 if (*p2 == '\r')
 290                                         *p2 = 0;
 291                         }
 292                         if (def == S_DEF_USER) {
 293                                 sym = sym_find(line + strlen(CONFIG_));
 294                                 if (!sym) {
 295                                         sym_add_change_count(1);
 296                                         goto setsym;
 297                                 }
 298                         } else {
 299                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 300                                 if (sym->type == S_UNKNOWN)
 301                                         sym->type = S_OTHER;
 302                         }
 303                         if (sym->flags & def_flags) {
 304                                 conf_warning("override: reassigning to symbol %s", sym->name);
 305                         }
 306                         if (conf_set_sym_val(sym, def, def_flags, p))
 307                                 continue;
 308                 } else {
 309                         if (line[0] != '\r' && line[0] != '\n')
 310                                 conf_warning("unexpected data");
 311                         continue;
 312                 }
 313 setsym:
 314                 if (sym && sym_is_choice_value(sym)) {
 315                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 316                         switch (sym->def[def].tri) {
 317                         case no:
 318                                 break;
 319                         case mod:
 320                                 if (cs->def[def].tri == yes) {
 321                                         conf_warning("%s creates inconsistent choice state", sym->name);
 322                                         cs->flags &= ~def_flags;
 323                                 }
 324                                 break;
 325                         case yes:
 326                                 if (cs->def[def].tri != no)
 327                                         conf_warning("override: %s changes choice state", sym->name);
 328                                 cs->def[def].val = sym;
 329                                 break;
 330                         }
 331                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 332                 }
 333         }
 334         fclose(in);
 335
 336         if (modules_sym)
 337                 sym_calc_value(modules_sym);
 338         return 0;
 339 }
 340
 341 int conf_read(const char *name)
 342 {
 343         struct symbol *sym, *choice_sym;
 344         struct property *prop;
 345         struct expr *e;
 346         int i, flags;
 347
 348         sym_set_change_count(0);
 349
 350         if (conf_read_simple(name, S_DEF_USER))
 351                 return 1;
 352
 353         for_all_symbols(i, sym) {
 354                 sym_calc_value(sym);
 355                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 356                         goto sym_ok;
 357                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 358                         /* check that calculated value agrees with saved value */
 359                         switch (sym->type) {
 360                         case S_BOOLEAN:
 361                         case S_TRISTATE:
 362                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 363                                         break;
 364                                 if (!sym_is_choice(sym))
 365                                         goto sym_ok;
 366                         default:
 367                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 368                                         goto sym_ok;
 369                                 break;
 370                         }
 371                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 372                         /* no previous value and not saved */
 373                         goto sym_ok;
 374                 conf_unsaved++;
 375                 /* maybe print value in verbose mode... */
 376         sym_ok:
 377                 if (!sym_is_choice(sym))
 378                         continue;
 379                 /* The choice symbol only has a set value (and thus is not new)
 380                  * if all its visible childs have values.
 381                  */
 382                 prop = sym_get_choice_prop(sym);
 383                 flags = sym->flags;
 384                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 385                         if (choice_sym->visible != no)
 386                                 flags &= choice_sym->flags;
 387                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 388         }
 389
 390         for_all_symbols(i, sym) {
 391                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 392                         /* Reset values of generates values, so they'll appear
 393                          * as new, if they should become visible, but that
 394                          * doesn't quite work if the Kconfig and the saved
 395                          * configuration disagree.
 396                          */
 397                         if (sym->visible == no && !conf_unsaved)
 398                                 sym->flags &= ~SYMBOL_DEF_USER;
 399                         switch (sym->type) {
 400                         case S_STRING:
 401                         case S_INT:
 402                         case S_HEX:
 403                                 /* Reset a string value if it's out of range */
 404                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 405                                         break;
 406                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 407                                 conf_unsaved++;
 408                                 break;
 409                         default:
 410                                 break;
 411                         }
 412                 }
 413         }
 414
 415         sym_add_change_count(conf_warnings || conf_unsaved);
 416
 417         return 0;
 418 }
 419
 420 /* Write a S_STRING */
 421 static void conf_write_string(bool headerfile, const char *name,
 422                               const char *str, FILE *out)
 423 {
 424         int l;
 425         if (headerfile)
 426                 fprintf(out, "#define %s%s \"", CONFIG_, name);
 427         else
 428                 fprintf(out, "%s%s=\"", CONFIG_, name);
 429
 430         while (1) {
 431                 l = strcspn(str, "\"\\");
 432                 if (l) {
 433                         xfwrite(str, l, 1, out);
 434                         str += l;
 435                 }
 436                 if (!*str)
 437                         break;
 438                 fprintf(out, "\\%c", *str++);
 439         }
 440         fputs("\"\n", out);
 441 }
 442
 443 static void conf_write_symbol(struct symbol *sym, FILE *out, bool write_no)
 444 {
 445         const char *str;
 446
 447         switch (sym->type) {
 448         case S_BOOLEAN:
 449         case S_TRISTATE:
 450                 switch (sym_get_tristate_value(sym)) {
 451                 case no:
 452                         if (write_no)
 453                                 fprintf(out, "# %s%s is not set\n",
 454                                     CONFIG_, sym->name);
 455                         break;
 456                 case mod:
 457                         fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
 458                         break;
 459                 case yes:
 460                         fprintf(out, "%s%s=y\n", CONFIG_, sym->name);
 461                         break;
 462                 }
 463                 break;
 464         case S_STRING:
 465                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 466                 break;
 467         case S_HEX:
 468         case S_INT:
 469                 str = sym_get_string_value(sym);
 470                 fprintf(out, "%s%s=%s\n", CONFIG_, sym->name, str);
 471                 break;
 472         case S_OTHER:
 473         case S_UNKNOWN:
 474                 break;
 475         }
 476 }
 477
 478 /*
 479  * Write out a minimal config.
 480  * All values that has default values are skipped as this is redundant.
 481  */
 482 int conf_write_defconfig(const char *filename)
 483 {
 484         struct symbol *sym;
 485         struct menu *menu;
 486         FILE *out;
 487
 488         out = fopen(filename, "w");
 489         if (!out)
 490                 return 1;
 491
 492         sym_clear_all_valid();
 493
 494         /* Traverse all menus to find all relevant symbols */
 495         menu = rootmenu.list;
 496
 497         while (menu != NULL)
 498         {
 499                 sym = menu->sym;
 500                 if (sym == NULL) {
 501                         if (!menu_is_visible(menu))
 502                                 goto next_menu;
 503                 } else if (!sym_is_choice(sym)) {
 504                         sym_calc_value(sym);
 505                         if (!(sym->flags & SYMBOL_WRITE))
 506                                 goto next_menu;
 507                         sym->flags &= ~SYMBOL_WRITE;
 508                         /* If we cannot change the symbol - skip */
 509                         if (!sym_is_changable(sym))
 510                                 goto next_menu;
 511                         /* If symbol equals to default value - skip */
 512                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 513                                 goto next_menu;
 514
 515                         /*
 516                          * If symbol is a choice value and equals to the
 517                          * default for a choice - skip.
 518                          * But only if value is bool and equal to "y" and
 519                          * choice is not "optional".
 520                          * (If choice is "optional" then all values can be "n")
 521                          */
 522                         if (sym_is_choice_value(sym)) {
 523                                 struct symbol *cs;
 524                                 struct symbol *ds;
 525
 526                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 527                                 ds = sym_choice_default(cs);
 528                                 if (!sym_is_optional(cs) && sym == ds) {
 529                                         if ((sym->type == S_BOOLEAN) &&
 530                                             sym_get_tristate_value(sym) == yes)
 531                                                 goto next_menu;
 532                                 }
 533                         }
 534                         conf_write_symbol(sym, out, true);
 535                 }
 536 next_menu:
 537                 if (menu->list != NULL) {
 538                         menu = menu->list;
 539                 }
 540                 else if (menu->next != NULL) {
 541                         menu = menu->next;
 542                 } else {
 543                         while ((menu = menu->parent)) {
 544                                 if (menu->next != NULL) {
 545                                         menu = menu->next;
 546                                         break;
 547                                 }
 548                         }
 549                 }
 550         }
 551         fclose(out);
 552         return 0;
 553 }
 554
 555 int conf_write(const char *name)
 556 {
 557         FILE *out;
 558         struct symbol *sym;
 559         struct menu *menu;
 560         const char *basename;
 561         const char *str;
 562         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 563         char *env;
 564
 565         dirname[0] = 0;
 566         if (name && name[0]) {
 567                 struct stat st;
 568                 char *slash;
 569
 570                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 571                         strcpy(dirname, name);
 572                         strcat(dirname, "/");
 573                         basename = conf_get_configname();
 574                 } else if ((slash = strrchr(name, '/'))) {
 575                         int size = slash - name + 1;
 576                         memcpy(dirname, name, size);
 577                         dirname[size] = 0;
 578                         if (slash[1])
 579                                 basename = slash + 1;
 580                         else
 581                                 basename = conf_get_configname();
 582                 } else
 583                         basename = name;
 584         } else
 585                 basename = conf_get_configname();
 586
 587         sprintf(newname, "%s%s", dirname, basename);
 588         env = getenv("KCONFIG_OVERWRITECONFIG");
 589         if (!env || !*env) {
 590                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 591                 out = fopen(tmpname, "w");
 592         } else {
 593                 *tmpname = 0;
 594                 out = fopen(newname, "w");
 595         }
 596         if (!out)
 597                 return 1;
 598
 599         fprintf(out, _("#\n"
 600                        "# Automatically generated make config: don't edit\n"
 601                        "# %s\n"
 602                        "#\n"),
 603                      rootmenu.prompt->text);
 604
 605         if (!conf_get_changed())
 606                 sym_clear_all_valid();
 607
 608         menu = rootmenu.list;
 609         while (menu) {
 610                 sym = menu->sym;
 611                 if (!sym) {
 612                         if (!menu_is_visible(menu))
 613                                 goto next;
 614                         str = menu_get_prompt(menu);
 615                         fprintf(out, "\n"
 616                                      "#\n"
 617                                      "# %s\n"
 618                                      "#\n", str);
 619                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 620                         sym_calc_value(sym);
 621                         if (!(sym->flags & SYMBOL_WRITE))
 622                                 goto next;
 623                         sym->flags &= ~SYMBOL_WRITE;
 624                         /* Write config symbol to file */
 625                         conf_write_symbol(sym, out, true);
 626                 }
 627
 628 next:
 629                 if (menu->list) {
 630                         menu = menu->list;
 631                         continue;
 632                 }
 633                 if (menu->next)
 634                         menu = menu->next;
 635                 else while ((menu = menu->parent)) {
 636                         if (menu->next) {
 637                                 menu = menu->next;
 638                                 break;
 639                         }
 640                 }
 641         }
 642         fclose(out);
 643
 644         if (*tmpname) {
 645                 strcat(dirname, basename);
 646                 strcat(dirname, ".old");
 647                 rename(newname, dirname);
 648                 if (rename(tmpname, newname))
 649                         return 1;
 650         }
 651
 652         conf_message(_("configuration written to %s"), newname);
 653
 654         sym_set_change_count(0);
 655
 656         return 0;
 657 }
 658
 659 static int conf_split_config(void)
 660 {
 661         const char *name;
 662         char path[PATH_MAX+1];
 663         char *s, *d, c;
 664         struct symbol *sym;
 665         struct stat sb;
 666         int res, i, fd;
 667
 668         name = conf_get_autoconfig_name();
 669         conf_read_simple(name, S_DEF_AUTO);
 670
 671         if (chdir("include/config"))
 672                 return 1;
 673
 674         res = 0;
 675         for_all_symbols(i, sym) {
 676                 sym_calc_value(sym);
 677                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 678                         continue;
 679                 if (sym->flags & SYMBOL_WRITE) {
 680                         if (sym->flags & SYMBOL_DEF_AUTO) {
 681                                 /*
 682                                  * symbol has old and new value,
 683                                  * so compare them...
 684                                  */
 685                                 switch (sym->type) {
 686                                 case S_BOOLEAN:
 687                                 case S_TRISTATE:
 688                                         if (sym_get_tristate_value(sym) ==
 689                                             sym->def[S_DEF_AUTO].tri)
 690                                                 continue;
 691                                         break;
 692                                 case S_STRING:
 693                                 case S_HEX:
 694                                 case S_INT:
 695                                         if (!strcmp(sym_get_string_value(sym),
 696                                                     sym->def[S_DEF_AUTO].val))
 697                                                 continue;
 698                                         break;
 699                                 default:
 700                                         break;
 701                                 }
 702                         } else {
 703                                 /*
 704                                  * If there is no old value, only 'no' (unset)
 705                                  * is allowed as new value.
 706                                  */
 707                                 switch (sym->type) {
 708                                 case S_BOOLEAN:
 709                                 case S_TRISTATE:
 710                                         if (sym_get_tristate_value(sym) == no)
 711                                                 continue;
 712                                         break;
 713                                 default:
 714                                         break;
 715                                 }
 716                         }
 717                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 718                         /* There is neither an old nor a new value. */
 719                         continue;
 720                 /* else
 721                  *      There is an old value, but no new value ('no' (unset)
 722                  *      isn't saved in auto.conf, so the old value is always
 723                  *      different from 'no').
 724                  */
 725
 726                 /* Replace all '_' and append ".h" */
 727                 s = sym->name;
 728                 d = path;
 729                 while ((c = *s++)) {
 730                         c = tolower(c);
 731                         *d++ = (c == '_') ? '/' : c;
 732                 }
 733                 strcpy(d, ".h");
 734
 735                 /* Assume directory path already exists. */
 736                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 737                 if (fd == -1) {
 738                         if (errno != ENOENT) {
 739                                 res = 1;
 740                                 break;
 741                         }
 742                         /*
 743                          * Create directory components,
 744                          * unless they exist already.
 745                          */
 746                         d = path;
 747                         while ((d = strchr(d, '/'))) {
 748                                 *d = 0;
 749                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 750                                         res = 1;
 751                                         goto out;
 752                                 }
 753                                 *d++ = '/';
 754                         }
 755                         /* Try it again. */
 756                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 757                         if (fd == -1) {
 758                                 res = 1;
 759                                 break;
 760                         }
 761                 }
 762                 close(fd);
 763         }
 764 out:
 765         if (chdir("../.."))
 766                 return 1;
 767
 768         return res;
 769 }
 770
 771 int conf_write_autoconf(void)
 772 {
 773         struct symbol *sym;
 774         const char *str;
 775         const char *name;
 776         FILE *out, *tristate, *out_h;
 777         int i;
 778
 779         sym_clear_all_valid();
 780
 781         file_write_dep("include/config/auto.conf.cmd");
 782
 783         if (conf_split_config())
 784                 return 1;
 785
 786         out = fopen(".tmpconfig", "w");
 787         if (!out)
 788                 return 1;
 789
 790         tristate = fopen(".tmpconfig_tristate", "w");
 791         if (!tristate) {
 792                 fclose(out);
 793                 return 1;
 794         }
 795
 796         out_h = fopen(".tmpconfig.h", "w");
 797         if (!out_h) {
 798                 fclose(out);
 799                 fclose(tristate);
 800                 return 1;
 801         }
 802
 803         fprintf(out, "#\n"
 804                      "# Automatically generated make config: don't edit\n"
 805                      "# %s\n"
 806                      "#\n",
 807                      rootmenu.prompt->text);
 808         fprintf(tristate, "#\n"
 809                           "# Automatically generated - do not edit\n"
 810                           "\n");
 811         fprintf(out_h, "/*\n"
 812                        " * Automatically generated C config: don't edit\n"
 813                        " * %s\n"
 814                        " */\n",
 815                        rootmenu.prompt->text);
 816
 817         for_all_symbols(i, sym) {
 818                 sym_calc_value(sym);
 819                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 820                         continue;
 821
 822                 /* write symbol to config file */
 823                 conf_write_symbol(sym, out, false);
 824
 825                 /* update autoconf and tristate files */
 826                 switch (sym->type) {
 827                 case S_BOOLEAN:
 828                 case S_TRISTATE:
 829                         switch (sym_get_tristate_value(sym)) {
 830                         case no:
 831                                 break;
 832                         case mod:
 833                                 fprintf(tristate, "%s%s=M\n",
 834                                     CONFIG_, sym->name);
 835                                 fprintf(out_h, "#define %s%s_MODULE 1\n",
 836                                     CONFIG_, sym->name);
 837                                 break;
 838                         case yes:
 839                                 if (sym->type == S_TRISTATE)
 840                                         fprintf(tristate,"%s%s=Y\n",
 841                                             CONFIG_, sym->name);
 842                                 fprintf(out_h, "#define %s%s 1\n",
 843                                     CONFIG_, sym->name);
 844                                 break;
 845                         }
 846                         break;
 847                 case S_STRING:
 848                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
 849                         break;
 850                 case S_HEX:
 851                         str = sym_get_string_value(sym);
 852                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 853                                 fprintf(out_h, "#define %s%s 0x%s\n",
 854                                     CONFIG_, sym->name, str);
 855                                 break;
 856                         }
 857                 case S_INT:
 858                         str = sym_get_string_value(sym);
 859                         fprintf(out_h, "#define %s%s %s\n",
 860                             CONFIG_, sym->name, str);
 861                         break;
 862                 default:
 863                         break;
 864                 }
 865         }
 866         fclose(out);
 867         fclose(tristate);
 868         fclose(out_h);
 869
 870         name = getenv("KCONFIG_AUTOHEADER");
 871         if (!name)
 872                 name = "include/generated/autoconf.h";
 873         if (rename(".tmpconfig.h", name))
 874                 return 1;
 875         name = getenv("KCONFIG_TRISTATE");
 876         if (!name)
 877                 name = "include/config/tristate.conf";
 878         if (rename(".tmpconfig_tristate", name))
 879                 return 1;
 880         name = conf_get_autoconfig_name();
 881         /*
 882          * This must be the last step, kbuild has a dependency on auto.conf
 883          * and this marks the successful completion of the previous steps.
 884          */
 885         if (rename(".tmpconfig", name))
 886                 return 1;
 887
 888         return 0;
 889 }
 890
 891 static int sym_change_count;
 892 static void (*conf_changed_callback)(void);
 893
 894 void sym_set_change_count(int count)
 895 {
 896         int _sym_change_count = sym_change_count;
 897         sym_change_count = count;
 898         if (conf_changed_callback &&
 899             (bool)_sym_change_count != (bool)count)
 900                 conf_changed_callback();
 901 }
 902
 903 void sym_add_change_count(int count)
 904 {
 905         sym_set_change_count(count + sym_change_count);
 906 }
 907
 908 bool conf_get_changed(void)
 909 {
 910         return sym_change_count;
 911 }
 912
 913 void conf_set_changed_callback(void (*fn)(void))
 914 {
 915         conf_changed_callback = fn;
 916 }
 917
 918 static void randomize_choice_values(struct symbol *csym)
 919 {
 920         struct property *prop;
 921         struct symbol *sym;
 922         struct expr *e;
 923         int cnt, def;
 924
 925         /*
 926          * If choice is mod then we may have more items selected
 927          * and if no then no-one.
 928          * In both cases stop.
 929          */
 930         if (csym->curr.tri != yes)
 931                 return;
 932
 933         prop = sym_get_choice_prop(csym);
 934
 935         /* count entries in choice block */
 936         cnt = 0;
 937         expr_list_for_each_sym(prop->expr, e, sym)
 938                 cnt++;
 939
 940         /*
 941          * find a random value and set it to yes,
 942          * set the rest to no so we have only one set
 943          */
 944         def = (rand() % cnt);
 945
 946         cnt = 0;
 947         expr_list_for_each_sym(prop->expr, e, sym) {
 948                 if (def == cnt++) {
 949                         sym->def[S_DEF_USER].tri = yes;
 950                         csym->def[S_DEF_USER].val = sym;
 951                 }
 952                 else {
 953                         sym->def[S_DEF_USER].tri = no;
 954                 }
 955         }
 956         csym->flags |= SYMBOL_DEF_USER;
 957         /* clear VALID to get value calculated */
 958         csym->flags &= ~(SYMBOL_VALID);
 959 }
 960
 961 static void set_all_choice_values(struct symbol *csym)
 962 {
 963         struct property *prop;
 964         struct symbol *sym;
 965         struct expr *e;
 966
 967         prop = sym_get_choice_prop(csym);
 968
 969         /*
 970          * Set all non-assinged choice values to no
 971          */
 972         expr_list_for_each_sym(prop->expr, e, sym) {
 973                 if (!sym_has_value(sym))
 974                         sym->def[S_DEF_USER].tri = no;
 975         }
 976         csym->flags |= SYMBOL_DEF_USER;
 977         /* clear VALID to get value calculated */
 978         csym->flags &= ~(SYMBOL_VALID);
 979 }
 980
 981 void conf_set_all_new_symbols(enum conf_def_mode mode)
 982 {
 983         struct symbol *sym, *csym;
 984         int i, cnt;
 985
 986         for_all_symbols(i, sym) {
 987                 if (sym_has_value(sym))
 988                         continue;
 989                 switch (sym_get_type(sym)) {
 990                 case S_BOOLEAN:
 991                 case S_TRISTATE:
 992                         switch (mode) {
 993                         case def_yes:
 994                                 sym->def[S_DEF_USER].tri = yes;
 995                                 break;
 996                         case def_mod:
 997                                 sym->def[S_DEF_USER].tri = mod;
 998                                 break;
 999                         case def_no:
1000                                 sym->def[S_DEF_USER].tri = no;
1001                                 break;
1002                         case def_random:
1003                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1004                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1005                                 break;
1006                         default:
1007                                 continue;
1008                         }
1009                         if (!(sym_is_choice(sym) && mode == def_random))
1010                                 sym->flags |= SYMBOL_DEF_USER;
1011                         break;
1012                 default:
1013                         break;
1014                 }
1015
1016         }
1017
1018         sym_clear_all_valid();
1019
1020         /*
1021          * We have different type of choice blocks.
1022          * If curr.tri equals to mod then we can select several
1023          * choice symbols in one block.
1024          * In this case we do nothing.
1025          * If curr.tri equals yes then only one symbol can be
1026          * selected in a choice block and we set it to yes,
1027          * and the rest to no.
1028          */
1029         for_all_symbols(i, csym) {
1030                 if (sym_has_value(csym) || !sym_is_choice(csym))
1031                         continue;
1032
1033                 sym_calc_value(csym);
1034                 if (mode == def_random)
1035                         randomize_choice_values(csym);
1036                 else
1037                         set_all_choice_values(csym);
1038         }
1039 }