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                 /* 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                 break;
 145         case S_OTHER:
 146                 if (*p != '"') {
 147                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 148                                 ;
 149                         sym->type = S_STRING;
 150                         goto done;
 151                 }
 152                 /* fall through */
 153         case S_STRING:
 154                 if (*p++ != '"')
 155                         break;
 156                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 157                         if (*p2 == '"') {
 158                                 *p2 = 0;
 159                                 break;
 160                         }
 161                         memmove(p2, p2 + 1, strlen(p2));
 162                 }
 163                 if (!p2) {
 164                         conf_warning("invalid string found");
 165                         return 1;
 166                 }
 167                 /* fall through */
 168         case S_INT:
 169         case S_HEX:
 170         done:
 171                 if (sym_string_valid(sym, p)) {
 172                         sym->def[def].val = strdup(p);
 173                         sym->flags |= def_flags;
 174                 } else {
 175                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 176                         return 1;
 177                 }
 178                 break;
 179         default:
 180                 ;
 181         }
 182         return 0;
 183 }
 184
 185 int conf_read_simple(const char *name, int def)
 186 {
 187         FILE *in = NULL;
 188         char line[1024];
 189         char *p, *p2;
 190         struct symbol *sym;
 191         int i, def_flags;
 192
 193         if (name) {
 194                 in = zconf_fopen(name);
 195         } else {
 196                 struct property *prop;
 197
 198                 name = conf_get_configname();
 199                 in = zconf_fopen(name);
 200                 if (in)
 201                         goto load;
 202                 sym_add_change_count(1);
 203                 if (!sym_defconfig_list) {
 204                         if (modules_sym)
 205                                 sym_calc_value(modules_sym);
 206                         return 1;
 207                 }
 208
 209                 for_all_defaults(sym_defconfig_list, prop) {
 210                         if (expr_calc_value(prop->visible.expr) == no ||
 211                             prop->expr->type != E_SYMBOL)
 212                                 continue;
 213                         name = conf_expand_value(prop->expr->left.sym->name);
 214                         in = zconf_fopen(name);
 215                         if (in) {
 216                                 conf_message(_("using defaults found in %s"),
 217                                          name);
 218                                 goto load;
 219                         }
 220                 }
 221         }
 222         if (!in)
 223                 return 1;
 224
 225 load:
 226         conf_filename = name;
 227         conf_lineno = 0;
 228         conf_warnings = 0;
 229         conf_unsaved = 0;
 230
 231         def_flags = SYMBOL_DEF << def;
 232         for_all_symbols(i, sym) {
 233                 sym->flags |= SYMBOL_CHANGED;
 234                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 235                 if (sym_is_choice(sym))
 236                         sym->flags |= def_flags;
 237                 switch (sym->type) {
 238                 case S_INT:
 239                 case S_HEX:
 240                 case S_STRING:
 241                         if (sym->def[def].val)
 242                                 free(sym->def[def].val);
 243                         /* fall through */
 244                 default:
 245                         sym->def[def].val = NULL;
 246                         sym->def[def].tri = no;
 247                 }
 248         }
 249
 250         while (fgets(line, sizeof(line), in)) {
 251                 conf_lineno++;
 252                 sym = NULL;
 253                 if (line[0] == '#') {
 254                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 255                                 continue;
 256                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 257                         if (!p)
 258                                 continue;
 259                         *p++ = 0;
 260                         if (strncmp(p, "is not set", 10))
 261                                 continue;
 262                         if (def == S_DEF_USER) {
 263                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 264                                 if (!sym) {
 265                                         sym_add_change_count(1);
 266                                         goto setsym;
 267                                 }
 268                         } else {
 269                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 270                                 if (sym->type == S_UNKNOWN)
 271                                         sym->type = S_BOOLEAN;
 272                         }
 273                         if (sym->flags & def_flags) {
 274                                 conf_warning("override: reassigning to symbol %s", sym->name);
 275                         }
 276                         switch (sym->type) {
 277                         case S_BOOLEAN:
 278                         case S_TRISTATE:
 279                                 sym->def[def].tri = no;
 280                                 sym->flags |= def_flags;
 281                                 break;
 282                         default:
 283                                 ;
 284                         }
 285                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 286                         p = strchr(line + strlen(CONFIG_), '=');
 287                         if (!p)
 288                                 continue;
 289                         *p++ = 0;
 290                         p2 = strchr(p, '\n');
 291                         if (p2) {
 292                                 *p2-- = 0;
 293                                 if (*p2 == '\r')
 294                                         *p2 = 0;
 295                         }
 296                         if (def == S_DEF_USER) {
 297                                 sym = sym_find(line + strlen(CONFIG_));
 298                                 if (!sym) {
 299                                         sym_add_change_count(1);
 300                                         goto setsym;
 301                                 }
 302                         } else {
 303                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 304                                 if (sym->type == S_UNKNOWN)
 305                                         sym->type = S_OTHER;
 306                         }
 307                         if (sym->flags & def_flags) {
 308                                 conf_warning("override: reassigning to symbol %s", sym->name);
 309                         }
 310                         if (conf_set_sym_val(sym, def, def_flags, p))
 311                                 continue;
 312                 } else {
 313                         if (line[0] != '\r' && line[0] != '\n')
 314                                 conf_warning("unexpected data");
 315                         continue;
 316                 }
 317 setsym:
 318                 if (sym && sym_is_choice_value(sym)) {
 319                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 320                         switch (sym->def[def].tri) {
 321                         case no:
 322                                 break;
 323                         case mod:
 324                                 if (cs->def[def].tri == yes) {
 325                                         conf_warning("%s creates inconsistent choice state", sym->name);
 326                                         cs->flags &= ~def_flags;
 327                                 }
 328                                 break;
 329                         case yes:
 330                                 if (cs->def[def].tri != no)
 331                                         conf_warning("override: %s changes choice state", sym->name);
 332                                 cs->def[def].val = sym;
 333                                 break;
 334                         }
 335                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 336                 }
 337         }
 338         fclose(in);
 339
 340         if (modules_sym)
 341                 sym_calc_value(modules_sym);
 342         return 0;
 343 }
 344
 345 int conf_read(const char *name)
 346 {
 347         struct symbol *sym, *choice_sym;
 348         struct property *prop;
 349         struct expr *e;
 350         int i, flags;
 351
 352         sym_set_change_count(0);
 353
 354         if (conf_read_simple(name, S_DEF_USER))
 355                 return 1;
 356
 357         for_all_symbols(i, sym) {
 358                 sym_calc_value(sym);
 359                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 360                         goto sym_ok;
 361                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 362                         /* check that calculated value agrees with saved value */
 363                         switch (sym->type) {
 364                         case S_BOOLEAN:
 365                         case S_TRISTATE:
 366                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 367                                         break;
 368                                 if (!sym_is_choice(sym))
 369                                         goto sym_ok;
 370                                 /* fall through */
 371                         default:
 372                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 373                                         goto sym_ok;
 374                                 break;
 375                         }
 376                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 377                         /* no previous value and not saved */
 378                         goto sym_ok;
 379                 conf_unsaved++;
 380                 /* maybe print value in verbose mode... */
 381         sym_ok:
 382                 if (!sym_is_choice(sym))
 383                         continue;
 384                 /* The choice symbol only has a set value (and thus is not new)
 385                  * if all its visible childs have values.
 386                  */
 387                 prop = sym_get_choice_prop(sym);
 388                 flags = sym->flags;
 389                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 390                         if (choice_sym->visible != no)
 391                                 flags &= choice_sym->flags;
 392                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 393         }
 394
 395         for_all_symbols(i, sym) {
 396                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 397                         /* Reset values of generates values, so they'll appear
 398                          * as new, if they should become visible, but that
 399                          * doesn't quite work if the Kconfig and the saved
 400                          * configuration disagree.
 401                          */
 402                         if (sym->visible == no && !conf_unsaved)
 403                                 sym->flags &= ~SYMBOL_DEF_USER;
 404                         switch (sym->type) {
 405                         case S_STRING:
 406                         case S_INT:
 407                         case S_HEX:
 408                                 /* Reset a string value if it's out of range */
 409                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 410                                         break;
 411                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 412                                 conf_unsaved++;
 413                                 break;
 414                         default:
 415                                 break;
 416                         }
 417                 }
 418         }
 419
 420         sym_add_change_count(conf_warnings || conf_unsaved);
 421
 422         return 0;
 423 }
 424
 425 /* Write a S_STRING */
 426 static void conf_write_string(bool headerfile, const char *name,
 427                               const char *str, FILE *out)
 428 {
 429         int l;
 430         if (headerfile)
 431                 fprintf(out, "#define %s%s \"", CONFIG_, name);
 432         else
 433                 fprintf(out, "%s%s=\"", CONFIG_, name);
 434
 435         while (1) {
 436                 l = strcspn(str, "\"\\");
 437                 if (l) {
 438                         xfwrite(str, l, 1, out);
 439                         str += l;
 440                 }
 441                 if (!*str)
 442                         break;
 443                 fprintf(out, "\\%c", *str++);
 444         }
 445         fputs("\"\n", out);
 446 }
 447
 448 static void conf_write_symbol(struct symbol *sym, FILE *out, bool write_no)
 449 {
 450         const char *str;
 451
 452         switch (sym->type) {
 453         case S_BOOLEAN:
 454         case S_TRISTATE:
 455                 switch (sym_get_tristate_value(sym)) {
 456                 case no:
 457                         if (write_no)
 458                                 fprintf(out, "# %s%s is not set\n",
 459                                     CONFIG_, sym->name);
 460                         break;
 461                 case mod:
 462                         fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
 463                         break;
 464                 case yes:
 465                         fprintf(out, "%s%s=y\n", CONFIG_, sym->name);
 466                         break;
 467                 }
 468                 break;
 469         case S_STRING:
 470                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 471                 break;
 472         case S_HEX:
 473         case S_INT:
 474                 str = sym_get_string_value(sym);
 475                 fprintf(out, "%s%s=%s\n", CONFIG_, sym->name, str);
 476                 break;
 477         case S_OTHER:
 478         case S_UNKNOWN:
 479                 break;
 480         }
 481 }
 482
 483 /*
 484  * Write out a minimal config.
 485  * All values that has default values are skipped as this is redundant.
 486  */
 487 int conf_write_defconfig(const char *filename)
 488 {
 489         struct symbol *sym;
 490         struct menu *menu;
 491         FILE *out;
 492
 493         out = fopen(filename, "w");
 494         if (!out)
 495                 return 1;
 496
 497         sym_clear_all_valid();
 498
 499         /* Traverse all menus to find all relevant symbols */
 500         menu = rootmenu.list;
 501
 502         while (menu != NULL)
 503         {
 504                 sym = menu->sym;
 505                 if (sym == NULL) {
 506                         if (!menu_is_visible(menu))
 507                                 goto next_menu;
 508                 } else if (!sym_is_choice(sym)) {
 509                         sym_calc_value(sym);
 510                         if (!(sym->flags & SYMBOL_WRITE))
 511                                 goto next_menu;
 512                         sym->flags &= ~SYMBOL_WRITE;
 513                         /* If we cannot change the symbol - skip */
 514                         if (!sym_is_changable(sym))
 515                                 goto next_menu;
 516                         /* If symbol equals to default value - skip */
 517                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 518                                 goto next_menu;
 519
 520                         /*
 521                          * If symbol is a choice value and equals to the
 522                          * default for a choice - skip.
 523                          * But only if value is bool and equal to "y" and
 524                          * choice is not "optional".
 525                          * (If choice is "optional" then all values can be "n")
 526                          */
 527                         if (sym_is_choice_value(sym)) {
 528                                 struct symbol *cs;
 529                                 struct symbol *ds;
 530
 531                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 532                                 ds = sym_choice_default(cs);
 533                                 if (!sym_is_optional(cs) && sym == ds) {
 534                                         if ((sym->type == S_BOOLEAN) &&
 535                                             sym_get_tristate_value(sym) == yes)
 536                                                 goto next_menu;
 537                                 }
 538                         }
 539                         conf_write_symbol(sym, out, true);
 540                 }
 541 next_menu:
 542                 if (menu->list != NULL) {
 543                         menu = menu->list;
 544                 }
 545                 else if (menu->next != NULL) {
 546                         menu = menu->next;
 547                 } else {
 548                         while ((menu = menu->parent)) {
 549                                 if (menu->next != NULL) {
 550                                         menu = menu->next;
 551                                         break;
 552                                 }
 553                         }
 554                 }
 555         }
 556         fclose(out);
 557         return 0;
 558 }
 559
 560 int conf_write(const char *name)
 561 {
 562         FILE *out;
 563         struct symbol *sym;
 564         struct menu *menu;
 565         const char *basename;
 566         const char *str;
 567         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 568         char *env;
 569
 570         dirname[0] = 0;
 571         if (name && name[0]) {
 572                 struct stat st;
 573                 char *slash;
 574
 575                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 576                         strcpy(dirname, name);
 577                         strcat(dirname, "/");
 578                         basename = conf_get_configname();
 579                 } else if ((slash = strrchr(name, '/'))) {
 580                         int size = slash - name + 1;
 581                         memcpy(dirname, name, size);
 582                         dirname[size] = 0;
 583                         if (slash[1])
 584                                 basename = slash + 1;
 585                         else
 586                                 basename = conf_get_configname();
 587                 } else
 588                         basename = name;
 589         } else
 590                 basename = conf_get_configname();
 591
 592         sprintf(newname, "%s%s", dirname, basename);
 593         env = getenv("KCONFIG_OVERWRITECONFIG");
 594         if (!env || !*env) {
 595                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 596                 out = fopen(tmpname, "w");
 597         } else {
 598                 *tmpname = 0;
 599                 out = fopen(newname, "w");
 600         }
 601         if (!out)
 602                 return 1;
 603
 604         fprintf(out, _("#\n"
 605                        "# Automatically generated make config: don't edit\n"
 606                        "# %s\n"
 607                        "#\n"),
 608                      rootmenu.prompt->text);
 609
 610         if (!conf_get_changed())
 611                 sym_clear_all_valid();
 612
 613         menu = rootmenu.list;
 614         while (menu) {
 615                 sym = menu->sym;
 616                 if (!sym) {
 617                         if (!menu_is_visible(menu))
 618                                 goto next;
 619                         str = menu_get_prompt(menu);
 620                         fprintf(out, "\n"
 621                                      "#\n"
 622                                      "# %s\n"
 623                                      "#\n", str);
 624                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 625                         sym_calc_value(sym);
 626                         if (!(sym->flags & SYMBOL_WRITE))
 627                                 goto next;
 628                         sym->flags &= ~SYMBOL_WRITE;
 629                         /* Write config symbol to file */
 630                         conf_write_symbol(sym, out, true);
 631                 }
 632
 633 next:
 634                 if (menu->list) {
 635                         menu = menu->list;
 636                         continue;
 637                 }
 638                 if (menu->next)
 639                         menu = menu->next;
 640                 else while ((menu = menu->parent)) {
 641                         if (menu->next) {
 642                                 menu = menu->next;
 643                                 break;
 644                         }
 645                 }
 646         }
 647         fclose(out);
 648
 649         if (*tmpname) {
 650                 strcat(dirname, basename);
 651                 strcat(dirname, ".old");
 652                 rename(newname, dirname);
 653                 if (rename(tmpname, newname))
 654                         return 1;
 655         }
 656
 657         conf_message(_("configuration written to %s"), newname);
 658
 659         sym_set_change_count(0);
 660
 661         return 0;
 662 }
 663
 664 static int conf_split_config(void)
 665 {
 666         const char *name;
 667         char path[PATH_MAX+1];
 668         char *s, *d, c;
 669         struct symbol *sym;
 670         struct stat sb;
 671         int res, i, fd;
 672
 673         name = conf_get_autoconfig_name();
 674         conf_read_simple(name, S_DEF_AUTO);
 675
 676         if (chdir("include/config"))
 677                 return 1;
 678
 679         res = 0;
 680         for_all_symbols(i, sym) {
 681                 sym_calc_value(sym);
 682                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 683                         continue;
 684                 if (sym->flags & SYMBOL_WRITE) {
 685                         if (sym->flags & SYMBOL_DEF_AUTO) {
 686                                 /*
 687                                  * symbol has old and new value,
 688                                  * so compare them...
 689                                  */
 690                                 switch (sym->type) {
 691                                 case S_BOOLEAN:
 692                                 case S_TRISTATE:
 693                                         if (sym_get_tristate_value(sym) ==
 694                                             sym->def[S_DEF_AUTO].tri)
 695                                                 continue;
 696                                         break;
 697                                 case S_STRING:
 698                                 case S_HEX:
 699                                 case S_INT:
 700                                         if (!strcmp(sym_get_string_value(sym),
 701                                                     sym->def[S_DEF_AUTO].val))
 702                                                 continue;
 703                                         break;
 704                                 default:
 705                                         break;
 706                                 }
 707                         } else {
 708                                 /*
 709                                  * If there is no old value, only 'no' (unset)
 710                                  * is allowed as new value.
 711                                  */
 712                                 switch (sym->type) {
 713                                 case S_BOOLEAN:
 714                                 case S_TRISTATE:
 715                                         if (sym_get_tristate_value(sym) == no)
 716                                                 continue;
 717                                         break;
 718                                 default:
 719                                         break;
 720                                 }
 721                         }
 722                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 723                         /* There is neither an old nor a new value. */
 724                         continue;
 725                 /* else
 726                  *      There is an old value, but no new value ('no' (unset)
 727                  *      isn't saved in auto.conf, so the old value is always
 728                  *      different from 'no').
 729                  */
 730
 731                 /* Replace all '_' and append ".h" */
 732                 s = sym->name;
 733                 d = path;
 734                 while ((c = *s++)) {
 735                         c = tolower(c);
 736                         *d++ = (c == '_') ? '/' : c;
 737                 }
 738                 strcpy(d, ".h");
 739
 740                 /* Assume directory path already exists. */
 741                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 742                 if (fd == -1) {
 743                         if (errno != ENOENT) {
 744                                 res = 1;
 745                                 break;
 746                         }
 747                         /*
 748                          * Create directory components,
 749                          * unless they exist already.
 750                          */
 751                         d = path;
 752                         while ((d = strchr(d, '/'))) {
 753                                 *d = 0;
 754                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 755                                         res = 1;
 756                                         goto out;
 757                                 }
 758                                 *d++ = '/';
 759                         }
 760                         /* Try it again. */
 761                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 762                         if (fd == -1) {
 763                                 res = 1;
 764                                 break;
 765                         }
 766                 }
 767                 close(fd);
 768         }
 769 out:
 770         if (chdir("../.."))
 771                 return 1;
 772
 773         return res;
 774 }
 775
 776 int conf_write_autoconf(void)
 777 {
 778         struct symbol *sym;
 779         const char *str;
 780         const char *name;
 781         FILE *out, *tristate, *out_h;
 782         int i;
 783
 784         sym_clear_all_valid();
 785
 786         file_write_dep("include/config/auto.conf.cmd");
 787
 788         if (conf_split_config())
 789                 return 1;
 790
 791         out = fopen(".tmpconfig", "w");
 792         if (!out)
 793                 return 1;
 794
 795         tristate = fopen(".tmpconfig_tristate", "w");
 796         if (!tristate) {
 797                 fclose(out);
 798                 return 1;
 799         }
 800
 801         out_h = fopen(".tmpconfig.h", "w");
 802         if (!out_h) {
 803                 fclose(out);
 804                 fclose(tristate);
 805                 return 1;
 806         }
 807
 808         fprintf(out, "#\n"
 809                      "# Automatically generated make config: don't edit\n"
 810                      "# %s\n"
 811                      "#\n",
 812                      rootmenu.prompt->text);
 813         fprintf(tristate, "#\n"
 814                           "# Automatically generated - do not edit\n"
 815                           "\n");
 816         fprintf(out_h, "/*\n"
 817                        " * Automatically generated C config: don't edit\n"
 818                        " * %s\n"
 819                        " */\n",
 820                        rootmenu.prompt->text);
 821
 822         for_all_symbols(i, sym) {
 823                 sym_calc_value(sym);
 824                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 825                         continue;
 826
 827                 /* write symbol to config file */
 828                 conf_write_symbol(sym, out, false);
 829
 830                 /* update autoconf and tristate files */
 831                 switch (sym->type) {
 832                 case S_BOOLEAN:
 833                 case S_TRISTATE:
 834                         switch (sym_get_tristate_value(sym)) {
 835                         case no:
 836                                 break;
 837                         case mod:
 838                                 fprintf(tristate, "%s%s=M\n",
 839                                     CONFIG_, sym->name);
 840                                 fprintf(out_h, "#define %s%s_MODULE 1\n",
 841                                     CONFIG_, sym->name);
 842                                 break;
 843                         case yes:
 844                                 if (sym->type == S_TRISTATE)
 845                                         fprintf(tristate,"%s%s=Y\n",
 846                                             CONFIG_, sym->name);
 847                                 fprintf(out_h, "#define %s%s 1\n",
 848                                     CONFIG_, sym->name);
 849                                 break;
 850                         }
 851                         break;
 852                 case S_STRING:
 853                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
 854                         break;
 855                 case S_HEX:
 856                         str = sym_get_string_value(sym);
 857                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 858                                 fprintf(out_h, "#define %s%s 0x%s\n",
 859                                     CONFIG_, sym->name, str);
 860                                 break;
 861                         }
 862                 case S_INT:
 863                         str = sym_get_string_value(sym);
 864                         fprintf(out_h, "#define %s%s %s\n",
 865                             CONFIG_, sym->name, str);
 866                         break;
 867                 default:
 868                         break;
 869                 }
 870         }
 871         fclose(out);
 872         fclose(tristate);
 873         fclose(out_h);
 874
 875         name = getenv("KCONFIG_AUTOHEADER");
 876         if (!name)
 877                 name = "include/generated/autoconf.h";
 878         if (rename(".tmpconfig.h", name))
 879                 return 1;
 880         name = getenv("KCONFIG_TRISTATE");
 881         if (!name)
 882                 name = "include/config/tristate.conf";
 883         if (rename(".tmpconfig_tristate", name))
 884                 return 1;
 885         name = conf_get_autoconfig_name();
 886         /*
 887          * This must be the last step, kbuild has a dependency on auto.conf
 888          * and this marks the successful completion of the previous steps.
 889          */
 890         if (rename(".tmpconfig", name))
 891                 return 1;
 892
 893         return 0;
 894 }
 895
 896 static int sym_change_count;
 897 static void (*conf_changed_callback)(void);
 898
 899 void sym_set_change_count(int count)
 900 {
 901         int _sym_change_count = sym_change_count;
 902         sym_change_count = count;
 903         if (conf_changed_callback &&
 904             (bool)_sym_change_count != (bool)count)
 905                 conf_changed_callback();
 906 }
 907
 908 void sym_add_change_count(int count)
 909 {
 910         sym_set_change_count(count + sym_change_count);
 911 }
 912
 913 bool conf_get_changed(void)
 914 {
 915         return sym_change_count;
 916 }
 917
 918 void conf_set_changed_callback(void (*fn)(void))
 919 {
 920         conf_changed_callback = fn;
 921 }
 922
 923 static void randomize_choice_values(struct symbol *csym)
 924 {
 925         struct property *prop;
 926         struct symbol *sym;
 927         struct expr *e;
 928         int cnt, def;
 929
 930         /*
 931          * If choice is mod then we may have more items selected
 932          * and if no then no-one.
 933          * In both cases stop.
 934          */
 935         if (csym->curr.tri != yes)
 936                 return;
 937
 938         prop = sym_get_choice_prop(csym);
 939
 940         /* count entries in choice block */
 941         cnt = 0;
 942         expr_list_for_each_sym(prop->expr, e, sym)
 943                 cnt++;
 944
 945         /*
 946          * find a random value and set it to yes,
 947          * set the rest to no so we have only one set
 948          */
 949         def = (rand() % cnt);
 950
 951         cnt = 0;
 952         expr_list_for_each_sym(prop->expr, e, sym) {
 953                 if (def == cnt++) {
 954                         sym->def[S_DEF_USER].tri = yes;
 955                         csym->def[S_DEF_USER].val = sym;
 956                 }
 957                 else {
 958                         sym->def[S_DEF_USER].tri = no;
 959                 }
 960         }
 961         csym->flags |= SYMBOL_DEF_USER;
 962         /* clear VALID to get value calculated */
 963         csym->flags &= ~(SYMBOL_VALID);
 964 }
 965
 966 static void set_all_choice_values(struct symbol *csym)
 967 {
 968         struct property *prop;
 969         struct symbol *sym;
 970         struct expr *e;
 971
 972         prop = sym_get_choice_prop(csym);
 973
 974         /*
 975          * Set all non-assinged choice values to no
 976          */
 977         expr_list_for_each_sym(prop->expr, e, sym) {
 978                 if (!sym_has_value(sym))
 979                         sym->def[S_DEF_USER].tri = no;
 980         }
 981         csym->flags |= SYMBOL_DEF_USER;
 982         /* clear VALID to get value calculated */
 983         csym->flags &= ~(SYMBOL_VALID);
 984 }
 985
 986 void conf_set_all_new_symbols(enum conf_def_mode mode)
 987 {
 988         struct symbol *sym, *csym;
 989         int i, cnt;
 990
 991         for_all_symbols(i, sym) {
 992                 if (sym_has_value(sym))
 993                         continue;
 994                 switch (sym_get_type(sym)) {
 995                 case S_BOOLEAN:
 996                 case S_TRISTATE:
 997                         switch (mode) {
 998                         case def_yes:
 999                                 sym->def[S_DEF_USER].tri = yes;
1000                                 break;
1001                         case def_mod:
1002                                 sym->def[S_DEF_USER].tri = mod;
1003                                 break;
1004                         case def_no:
1005                                 sym->def[S_DEF_USER].tri = no;
1006                                 break;
1007                         case def_random:
1008                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1009                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1010                                 break;
1011                         default:
1012                                 continue;
1013                         }
1014                         if (!(sym_is_choice(sym) && mode == def_random))
1015                                 sym->flags |= SYMBOL_DEF_USER;
1016                         break;
1017                 default:
1018                         break;
1019                 }
1020
1021         }
1022
1023         sym_clear_all_valid();
1024
1025         /*
1026          * We have different type of choice blocks.
1027          * If curr.tri equals to mod then we can select several
1028          * choice symbols in one block.
1029          * In this case we do nothing.
1030          * If curr.tri equals yes then only one symbol can be
1031          * selected in a choice block and we set it to yes,
1032          * and the rest to no.
1033          */
1034         for_all_symbols(i, csym) {
1035                 if (sym_has_value(csym) || !sym_is_choice(csym))
1036                         continue;
1037
1038                 sym_calc_value(csym);
1039                 if (mode == def_random)
1040                         randomize_choice_values(csym);
1041                 else
1042                         set_all_choice_values(csym);
1043         }
1044 }