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 <fcntl.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <time.h>
  13 #include <unistd.h>
  14
  15 #define LKC_DIRECT_LINK
  16 #include "lkc.h"
  17
  18 static void conf_warning(const char *fmt, ...)
  19         __attribute__ ((format (printf, 1, 2)));
  20
  21 static const char *conf_filename;
  22 static int conf_lineno, conf_warnings, conf_unsaved;
  23
  24 const char conf_defname[] = "arch/$ARCH/defconfig";
  25
  26 static void conf_warning(const char *fmt, ...)
  27 {
  28         va_list ap;
  29         va_start(ap, fmt);
  30         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  31         vfprintf(stderr, fmt, ap);
  32         fprintf(stderr, "\n");
  33         va_end(ap);
  34         conf_warnings++;
  35 }
  36
  37 const char *conf_get_configname(void)
  38 {
  39         char *name = getenv("KCONFIG_CONFIG");
  40
  41         return name ? name : ".config";
  42 }
  43
  44 const char *conf_get_autoconfig_name(void)
  45 {
  46         char *name = getenv("KCONFIG_AUTOCONFIG");
  47
  48         return name ? name : "include/config/auto.conf";
  49 }
  50
  51 static char *conf_expand_value(const char *in)
  52 {
  53         struct symbol *sym;
  54         const char *src;
  55         static char res_value[SYMBOL_MAXLENGTH];
  56         char *dst, name[SYMBOL_MAXLENGTH];
  57
  58         res_value[0] = 0;
  59         dst = name;
  60         while ((src = strchr(in, '$'))) {
  61                 strncat(res_value, in, src - in);
  62                 src++;
  63                 dst = name;
  64                 while (isalnum(*src) || *src == '_')
  65                         *dst++ = *src++;
  66                 *dst = 0;
  67                 sym = sym_lookup(name, 0);
  68                 sym_calc_value(sym);
  69                 strcat(res_value, sym_get_string_value(sym));
  70                 in = src;
  71         }
  72         strcat(res_value, in);
  73
  74         return res_value;
  75 }
  76
  77 char *conf_get_default_confname(void)
  78 {
  79         struct stat buf;
  80         static char fullname[PATH_MAX+1];
  81         char *env, *name;
  82
  83         name = conf_expand_value(conf_defname);
  84         env = getenv(SRCTREE);
  85         if (env) {
  86                 sprintf(fullname, "%s/%s", env, name);
  87                 if (!stat(fullname, &buf))
  88                         return fullname;
  89         }
  90         return name;
  91 }
  92
  93 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
  94 {
  95         char *p2;
  96
  97         switch (sym->type) {
  98         case S_TRISTATE:
  99                 if (p[0] == 'm') {
 100                         sym->def[def].tri = mod;
 101                         sym->flags |= def_flags;
 102                         break;
 103                 }
 104         case S_BOOLEAN:
 105                 if (p[0] == 'y') {
 106                         sym->def[def].tri = yes;
 107                         sym->flags |= def_flags;
 108                         break;
 109                 }
 110                 if (p[0] == 'n') {
 111                         sym->def[def].tri = no;
 112                         sym->flags |= def_flags;
 113                         break;
 114                 }
 115                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 116                 break;
 117         case S_OTHER:
 118                 if (*p != '"') {
 119                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 120                                 ;
 121                         sym->type = S_STRING;
 122                         goto done;
 123                 }
 124         case S_STRING:
 125                 if (*p++ != '"')
 126                         break;
 127                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 128                         if (*p2 == '"') {
 129                                 *p2 = 0;
 130                                 break;
 131                         }
 132                         memmove(p2, p2 + 1, strlen(p2));
 133                 }
 134                 if (!p2) {
 135                         conf_warning("invalid string found");
 136                         return 1;
 137                 }
 138         case S_INT:
 139         case S_HEX:
 140         done:
 141                 if (sym_string_valid(sym, p)) {
 142                         sym->def[def].val = strdup(p);
 143                         sym->flags |= def_flags;
 144                 } else {
 145                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 146                         return 1;
 147                 }
 148                 break;
 149         default:
 150                 ;
 151         }
 152         return 0;
 153 }
 154
 155 int conf_read_simple(const char *name, int def)
 156 {
 157         FILE *in = NULL;
 158         char line[1024];
 159         char *p, *p2;
 160         struct symbol *sym;
 161         int i, def_flags;
 162
 163         if (name) {
 164                 in = zconf_fopen(name);
 165         } else {
 166                 struct property *prop;
 167
 168                 name = conf_get_configname();
 169                 in = zconf_fopen(name);
 170                 if (in)
 171                         goto load;
 172                 sym_add_change_count(1);
 173                 if (!sym_defconfig_list) {
 174                         if (modules_sym)
 175                                 sym_calc_value(modules_sym);
 176                         return 1;
 177                 }
 178
 179                 for_all_defaults(sym_defconfig_list, prop) {
 180                         if (expr_calc_value(prop->visible.expr) == no ||
 181                             prop->expr->type != E_SYMBOL)
 182                                 continue;
 183                         name = conf_expand_value(prop->expr->left.sym->name);
 184                         in = zconf_fopen(name);
 185                         if (in) {
 186                                 printf(_("#\n"
 187                                          "# using defaults found in %s\n"
 188                                          "#\n"), name);
 189                                 goto load;
 190                         }
 191                 }
 192         }
 193         if (!in)
 194                 return 1;
 195
 196 load:
 197         conf_filename = name;
 198         conf_lineno = 0;
 199         conf_warnings = 0;
 200         conf_unsaved = 0;
 201
 202         def_flags = SYMBOL_DEF << def;
 203         for_all_symbols(i, sym) {
 204                 sym->flags |= SYMBOL_CHANGED;
 205                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 206                 if (sym_is_choice(sym))
 207                         sym->flags |= def_flags;
 208                 switch (sym->type) {
 209                 case S_INT:
 210                 case S_HEX:
 211                 case S_STRING:
 212                         if (sym->def[def].val)
 213                                 free(sym->def[def].val);
 214                 default:
 215                         sym->def[def].val = NULL;
 216                         sym->def[def].tri = no;
 217                 }
 218         }
 219
 220         while (fgets(line, sizeof(line), in)) {
 221                 conf_lineno++;
 222                 sym = NULL;
 223                 switch (line[0]) {
 224                 case '#':
 225                         if (memcmp(line + 2, "CONFIG_", 7))
 226                                 continue;
 227                         p = strchr(line + 9, ' ');
 228                         if (!p)
 229                                 continue;
 230                         *p++ = 0;
 231                         if (strncmp(p, "is not set", 10))
 232                                 continue;
 233                         if (def == S_DEF_USER) {
 234                                 sym = sym_find(line + 9);
 235                                 if (!sym) {
 236                                         sym_add_change_count(1);
 237                                         break;
 238                                 }
 239                         } else {
 240                                 sym = sym_lookup(line + 9, 0);
 241                                 if (sym->type == S_UNKNOWN)
 242                                         sym->type = S_BOOLEAN;
 243                         }
 244                         if (sym->flags & def_flags) {
 245                                 conf_warning("override: reassigning to symbol %s", sym->name);
 246                         }
 247                         switch (sym->type) {
 248                         case S_BOOLEAN:
 249                         case S_TRISTATE:
 250                                 sym->def[def].tri = no;
 251                                 sym->flags |= def_flags;
 252                                 break;
 253                         default:
 254                                 ;
 255                         }
 256                         break;
 257                 case 'C':
 258                         if (memcmp(line, "CONFIG_", 7)) {
 259                                 conf_warning("unexpected data");
 260                                 continue;
 261                         }
 262                         p = strchr(line + 7, '=');
 263                         if (!p)
 264                                 continue;
 265                         *p++ = 0;
 266                         p2 = strchr(p, '\n');
 267                         if (p2) {
 268                                 *p2-- = 0;
 269                                 if (*p2 == '\r')
 270                                         *p2 = 0;
 271                         }
 272                         if (def == S_DEF_USER) {
 273                                 sym = sym_find(line + 7);
 274                                 if (!sym) {
 275                                         sym_add_change_count(1);
 276                                         break;
 277                                 }
 278                         } else {
 279                                 sym = sym_lookup(line + 7, 0);
 280                                 if (sym->type == S_UNKNOWN)
 281                                         sym->type = S_OTHER;
 282                         }
 283                         if (sym->flags & def_flags) {
 284                                 conf_warning("override: reassigning to symbol %s", sym->name);
 285                         }
 286                         if (conf_set_sym_val(sym, def, def_flags, p))
 287                                 continue;
 288                         break;
 289                 case '\r':
 290                 case '\n':
 291                         break;
 292                 default:
 293                         conf_warning("unexpected data");
 294                         continue;
 295                 }
 296                 if (sym && sym_is_choice_value(sym)) {
 297                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 298                         switch (sym->def[def].tri) {
 299                         case no:
 300                                 break;
 301                         case mod:
 302                                 if (cs->def[def].tri == yes) {
 303                                         conf_warning("%s creates inconsistent choice state", sym->name);
 304                                         cs->flags &= ~def_flags;
 305                                 }
 306                                 break;
 307                         case yes:
 308                                 if (cs->def[def].tri != no)
 309                                         conf_warning("override: %s changes choice state", sym->name);
 310                                 cs->def[def].val = sym;
 311                                 break;
 312                         }
 313                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 314                 }
 315         }
 316         fclose(in);
 317
 318         if (modules_sym)
 319                 sym_calc_value(modules_sym);
 320         return 0;
 321 }
 322
 323 int conf_read(const char *name)
 324 {
 325         struct symbol *sym, *choice_sym;
 326         struct property *prop;
 327         struct expr *e;
 328         int i, flags;
 329
 330         sym_set_change_count(0);
 331
 332         if (conf_read_simple(name, S_DEF_USER))
 333                 return 1;
 334
 335         for_all_symbols(i, sym) {
 336                 sym_calc_value(sym);
 337                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 338                         goto sym_ok;
 339                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 340                         /* check that calculated value agrees with saved value */
 341                         switch (sym->type) {
 342                         case S_BOOLEAN:
 343                         case S_TRISTATE:
 344                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 345                                         break;
 346                                 if (!sym_is_choice(sym))
 347                                         goto sym_ok;
 348                         default:
 349                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 350                                         goto sym_ok;
 351                                 break;
 352                         }
 353                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 354                         /* no previous value and not saved */
 355                         goto sym_ok;
 356                 conf_unsaved++;
 357                 /* maybe print value in verbose mode... */
 358         sym_ok:
 359                 if (!sym_is_choice(sym))
 360                         continue;
 361                 /* The choice symbol only has a set value (and thus is not new)
 362                  * if all its visible childs have values.
 363                  */
 364                 prop = sym_get_choice_prop(sym);
 365                 flags = sym->flags;
 366                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 367                         if (choice_sym->visible != no)
 368                                 flags &= choice_sym->flags;
 369                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 370         }
 371
 372         for_all_symbols(i, sym) {
 373                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 374                         /* Reset values of generates values, so they'll appear
 375                          * as new, if they should become visible, but that
 376                          * doesn't quite work if the Kconfig and the saved
 377                          * configuration disagree.
 378                          */
 379                         if (sym->visible == no && !conf_unsaved)
 380                                 sym->flags &= ~SYMBOL_DEF_USER;
 381                         switch (sym->type) {
 382                         case S_STRING:
 383                         case S_INT:
 384                         case S_HEX:
 385                                 /* Reset a string value if it's out of range */
 386                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 387                                         break;
 388                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 389                                 conf_unsaved++;
 390                                 break;
 391                         default:
 392                                 break;
 393                         }
 394                 }
 395         }
 396
 397         sym_add_change_count(conf_warnings || conf_unsaved);
 398
 399         return 0;
 400 }
 401
 402 /* Write a S_STRING */
 403 static void conf_write_string(bool headerfile, const char *name,
 404                               const char *str, FILE *out)
 405 {
 406         int l;
 407         if (headerfile)
 408                 fprintf(out, "#define CONFIG_%s \"", name);
 409         else
 410                 fprintf(out, "CONFIG_%s=\"", name);
 411
 412         while (1) {
 413                 l = strcspn(str, "\"\\");
 414                 if (l) {
 415                         xfwrite(str, l, 1, out);
 416                         str += l;
 417                 }
 418                 if (!*str)
 419                         break;
 420                 fprintf(out, "\\%c", *str++);
 421         }
 422         fputs("\"\n", out);
 423 }
 424
 425 static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
 426                               FILE *out, bool write_no)
 427 {
 428         const char *str;
 429
 430         switch (type) {
 431         case S_BOOLEAN:
 432         case S_TRISTATE:
 433                 switch (sym_get_tristate_value(sym)) {
 434                 case no:
 435                         if (write_no)
 436                                 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 437                         break;
 438                 case mod:
 439                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 440                         break;
 441                 case yes:
 442                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 443                         break;
 444                 }
 445                 break;
 446         case S_STRING:
 447                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 448                 break;
 449         case S_HEX:
 450         case S_INT:
 451                 str = sym_get_string_value(sym);
 452                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 453                 break;
 454         case S_OTHER:
 455         case S_UNKNOWN:
 456                 break;
 457         }
 458 }
 459
 460 /*
 461  * Write out a minimal config.
 462  * All values that has default values are skipped as this is redundant.
 463  */
 464 int conf_write_defconfig(const char *filename)
 465 {
 466         struct symbol *sym;
 467         struct menu *menu;
 468         FILE *out;
 469
 470         out = fopen(filename, "w");
 471         if (!out)
 472                 return 1;
 473
 474         sym_clear_all_valid();
 475
 476         /* Traverse all menus to find all relevant symbols */
 477         menu = rootmenu.list;
 478
 479         while (menu != NULL)
 480         {
 481                 sym = menu->sym;
 482                 if (sym == NULL) {
 483                         if (!menu_is_visible(menu))
 484                                 goto next_menu;
 485                 } else if (!sym_is_choice(sym)) {
 486                         sym_calc_value(sym);
 487                         if (!(sym->flags & SYMBOL_WRITE))
 488                                 goto next_menu;
 489                         sym->flags &= ~SYMBOL_WRITE;
 490                         /* If we cannot change the symbol - skip */
 491                         if (!sym_is_changable(sym))
 492                                 goto next_menu;
 493                         /* If symbol equals to default value - skip */
 494                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 495                                 goto next_menu;
 496
 497                         /*
 498                          * If symbol is a choice value and equals to the
 499                          * default for a choice - skip.
 500                          * But only if value is bool and equal to "y" .
 501                          */
 502                         if (sym_is_choice_value(sym)) {
 503                                 struct symbol *cs;
 504                                 struct symbol *ds;
 505
 506                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 507                                 ds = sym_choice_default(cs);
 508                                 if (sym == ds) {
 509                                         if ((sym->type == S_BOOLEAN) &&
 510                                             sym_get_tristate_value(sym) == yes)
 511                                                 goto next_menu;
 512                                 }
 513                         }
 514                         conf_write_symbol(sym, sym->type, out, true);
 515                 }
 516 next_menu:
 517                 if (menu->list != NULL) {
 518                         menu = menu->list;
 519                 }
 520                 else if (menu->next != NULL) {
 521                         menu = menu->next;
 522                 } else {
 523                         while ((menu = menu->parent)) {
 524                                 if (menu->next != NULL) {
 525                                         menu = menu->next;
 526                                         break;
 527                                 }
 528                         }
 529                 }
 530         }
 531         fclose(out);
 532         return 0;
 533 }
 534
 535 int conf_write(const char *name)
 536 {
 537         FILE *out;
 538         struct symbol *sym;
 539         struct menu *menu;
 540         const char *basename;
 541         const char *str;
 542         char dirname[128], tmpname[128], newname[128];
 543         enum symbol_type type;
 544         time_t now;
 545         int use_timestamp = 1;
 546         char *env;
 547
 548         dirname[0] = 0;
 549         if (name && name[0]) {
 550                 struct stat st;
 551                 char *slash;
 552
 553                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 554                         strcpy(dirname, name);
 555                         strcat(dirname, "/");
 556                         basename = conf_get_configname();
 557                 } else if ((slash = strrchr(name, '/'))) {
 558                         int size = slash - name + 1;
 559                         memcpy(dirname, name, size);
 560                         dirname[size] = 0;
 561                         if (slash[1])
 562                                 basename = slash + 1;
 563                         else
 564                                 basename = conf_get_configname();
 565                 } else
 566                         basename = name;
 567         } else
 568                 basename = conf_get_configname();
 569
 570         sprintf(newname, "%s%s", dirname, basename);
 571         env = getenv("KCONFIG_OVERWRITECONFIG");
 572         if (!env || !*env) {
 573                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 574                 out = fopen(tmpname, "w");
 575         } else {
 576                 *tmpname = 0;
 577                 out = fopen(newname, "w");
 578         }
 579         if (!out)
 580                 return 1;
 581
 582         sym = sym_lookup("KERNELVERSION", 0);
 583         sym_calc_value(sym);
 584         time(&now);
 585         env = getenv("KCONFIG_NOTIMESTAMP");
 586         if (env && *env)
 587                 use_timestamp = 0;
 588
 589         fprintf(out, _("#\n"
 590                        "# Automatically generated make config: don't edit\n"
 591                        "# Linux kernel version: %s\n"
 592                        "%s%s"
 593                        "#\n"),
 594                      sym_get_string_value(sym),
 595                      use_timestamp ? "# " : "",
 596                      use_timestamp ? ctime(&now) : "");
 597
 598         if (!conf_get_changed())
 599                 sym_clear_all_valid();
 600
 601         menu = rootmenu.list;
 602         while (menu) {
 603                 sym = menu->sym;
 604                 if (!sym) {
 605                         if (!menu_is_visible(menu))
 606                                 goto next;
 607                         str = menu_get_prompt(menu);
 608                         fprintf(out, "\n"
 609                                      "#\n"
 610                                      "# %s\n"
 611                                      "#\n", str);
 612                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 613                         sym_calc_value(sym);
 614                         if (!(sym->flags & SYMBOL_WRITE))
 615                                 goto next;
 616                         sym->flags &= ~SYMBOL_WRITE;
 617                         type = sym->type;
 618                         if (type == S_TRISTATE) {
 619                                 sym_calc_value(modules_sym);
 620                                 if (modules_sym->curr.tri == no)
 621                                         type = S_BOOLEAN;
 622                         }
 623                         /* Write config symbol to file */
 624                         conf_write_symbol(sym, type, out, true);
 625                 }
 626
 627 next:
 628                 if (menu->list) {
 629                         menu = menu->list;
 630                         continue;
 631                 }
 632                 if (menu->next)
 633                         menu = menu->next;
 634                 else while ((menu = menu->parent)) {
 635                         if (menu->next) {
 636                                 menu = menu->next;
 637                                 break;
 638                         }
 639                 }
 640         }
 641         fclose(out);
 642
 643         if (*tmpname) {
 644                 strcat(dirname, basename);
 645                 strcat(dirname, ".old");
 646                 rename(newname, dirname);
 647                 if (rename(tmpname, newname))
 648                         return 1;
 649         }
 650
 651         printf(_("#\n"
 652                  "# configuration written to %s\n"
 653                  "#\n"), newname);
 654
 655         sym_set_change_count(0);
 656
 657         return 0;
 658 }
 659
 660 static int conf_split_config(void)
 661 {
 662         const char *name;
 663         char path[128];
 664         char *s, *d, c;
 665         struct symbol *sym;
 666         struct stat sb;
 667         int res, i, fd;
 668
 669         name = conf_get_autoconfig_name();
 670         conf_read_simple(name, S_DEF_AUTO);
 671
 672         if (chdir("include/config"))
 673                 return 1;
 674
 675         res = 0;
 676         for_all_symbols(i, sym) {
 677                 sym_calc_value(sym);
 678                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 679                         continue;
 680                 if (sym->flags & SYMBOL_WRITE) {
 681                         if (sym->flags & SYMBOL_DEF_AUTO) {
 682                                 /*
 683                                  * symbol has old and new value,
 684                                  * so compare them...
 685                                  */
 686                                 switch (sym->type) {
 687                                 case S_BOOLEAN:
 688                                 case S_TRISTATE:
 689                                         if (sym_get_tristate_value(sym) ==
 690                                             sym->def[S_DEF_AUTO].tri)
 691                                                 continue;
 692                                         break;
 693                                 case S_STRING:
 694                                 case S_HEX:
 695                                 case S_INT:
 696                                         if (!strcmp(sym_get_string_value(sym),
 697                                                     sym->def[S_DEF_AUTO].val))
 698                                                 continue;
 699                                         break;
 700                                 default:
 701                                         break;
 702                                 }
 703                         } else {
 704                                 /*
 705                                  * If there is no old value, only 'no' (unset)
 706                                  * is allowed as new value.
 707                                  */
 708                                 switch (sym->type) {
 709                                 case S_BOOLEAN:
 710                                 case S_TRISTATE:
 711                                         if (sym_get_tristate_value(sym) == no)
 712                                                 continue;
 713                                         break;
 714                                 default:
 715                                         break;
 716                                 }
 717                         }
 718                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 719                         /* There is neither an old nor a new value. */
 720                         continue;
 721                 /* else
 722                  *      There is an old value, but no new value ('no' (unset)
 723                  *      isn't saved in auto.conf, so the old value is always
 724                  *      different from 'no').
 725                  */
 726
 727                 /* Replace all '_' and append ".h" */
 728                 s = sym->name;
 729                 d = path;
 730                 while ((c = *s++)) {
 731                         c = tolower(c);
 732                         *d++ = (c == '_') ? '/' : c;
 733                 }
 734                 strcpy(d, ".h");
 735
 736                 /* Assume directory path already exists. */
 737                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 738                 if (fd == -1) {
 739                         if (errno != ENOENT) {
 740                                 res = 1;
 741                                 break;
 742                         }
 743                         /*
 744                          * Create directory components,
 745                          * unless they exist already.
 746                          */
 747                         d = path;
 748                         while ((d = strchr(d, '/'))) {
 749                                 *d = 0;
 750                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 751                                         res = 1;
 752                                         goto out;
 753                                 }
 754                                 *d++ = '/';
 755                         }
 756                         /* Try it again. */
 757                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 758                         if (fd == -1) {
 759                                 res = 1;
 760                                 break;
 761                         }
 762                 }
 763                 close(fd);
 764         }
 765 out:
 766         if (chdir("../.."))
 767                 return 1;
 768
 769         return res;
 770 }
 771
 772 int conf_write_autoconf(void)
 773 {
 774         struct symbol *sym;
 775         const char *str;
 776         const char *name;
 777         FILE *out, *tristate, *out_h;
 778         time_t now;
 779         int i;
 780
 781         sym_clear_all_valid();
 782
 783         file_write_dep("include/config/auto.conf.cmd");
 784
 785         if (conf_split_config())
 786                 return 1;
 787
 788         out = fopen(".tmpconfig", "w");
 789         if (!out)
 790                 return 1;
 791
 792         tristate = fopen(".tmpconfig_tristate", "w");
 793         if (!tristate) {
 794                 fclose(out);
 795                 return 1;
 796         }
 797
 798         out_h = fopen(".tmpconfig.h", "w");
 799         if (!out_h) {
 800                 fclose(out);
 801                 fclose(tristate);
 802                 return 1;
 803         }
 804
 805         sym = sym_lookup("KERNELVERSION", 0);
 806         sym_calc_value(sym);
 807         time(&now);
 808         fprintf(out, "#\n"
 809                      "# Automatically generated make config: don't edit\n"
 810                      "# Linux kernel version: %s\n"
 811                      "# %s"
 812                      "#\n",
 813                      sym_get_string_value(sym), ctime(&now));
 814         fprintf(tristate, "#\n"
 815                           "# Automatically generated - do not edit\n"
 816                           "\n");
 817         fprintf(out_h, "/*\n"
 818                        " * Automatically generated C config: don't edit\n"
 819                        " * Linux kernel version: %s\n"
 820                        " * %s"
 821                        " */\n"
 822                        "#define AUTOCONF_INCLUDED\n",
 823                        sym_get_string_value(sym), ctime(&now));
 824
 825         for_all_symbols(i, sym) {
 826                 sym_calc_value(sym);
 827                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 828                         continue;
 829
 830                 /* write symbol to config file */
 831                 conf_write_symbol(sym, sym->type, out, false);
 832
 833                 /* update autoconf and tristate files */
 834                 switch (sym->type) {
 835                 case S_BOOLEAN:
 836                 case S_TRISTATE:
 837                         switch (sym_get_tristate_value(sym)) {
 838                         case no:
 839                                 break;
 840                         case mod:
 841                                 fprintf(tristate, "CONFIG_%s=M\n", sym->name);
 842                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 843                                 break;
 844                         case yes:
 845                                 if (sym->type == S_TRISTATE)
 846                                         fprintf(tristate, "CONFIG_%s=Y\n",
 847                                                         sym->name);
 848                                 fprintf(out_h, "#define CONFIG_%s 1\n", 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 CONFIG_%s 0x%s\n", sym->name, str);
 859                                 break;
 860                         }
 861                 case S_INT:
 862                         str = sym_get_string_value(sym);
 863                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 864                         break;
 865                 default:
 866                         break;
 867                 }
 868         }
 869         fclose(out);
 870         fclose(tristate);
 871         fclose(out_h);
 872
 873         name = getenv("KCONFIG_AUTOHEADER");
 874         if (!name)
 875                 name = "include/generated/autoconf.h";
 876         if (rename(".tmpconfig.h", name))
 877                 return 1;
 878         name = getenv("KCONFIG_TRISTATE");
 879         if (!name)
 880                 name = "include/config/tristate.conf";
 881         if (rename(".tmpconfig_tristate", name))
 882                 return 1;
 883         name = conf_get_autoconfig_name();
 884         /*
 885          * This must be the last step, kbuild has a dependency on auto.conf
 886          * and this marks the successful completion of the previous steps.
 887          */
 888         if (rename(".tmpconfig", name))
 889                 return 1;
 890
 891         return 0;
 892 }
 893
 894 static int sym_change_count;
 895 static void (*conf_changed_callback)(void);
 896
 897 void sym_set_change_count(int count)
 898 {
 899         int _sym_change_count = sym_change_count;
 900         sym_change_count = count;
 901         if (conf_changed_callback &&
 902             (bool)_sym_change_count != (bool)count)
 903                 conf_changed_callback();
 904 }
 905
 906 void sym_add_change_count(int count)
 907 {
 908         sym_set_change_count(count + sym_change_count);
 909 }
 910
 911 bool conf_get_changed(void)
 912 {
 913         return sym_change_count;
 914 }
 915
 916 void conf_set_changed_callback(void (*fn)(void))
 917 {
 918         conf_changed_callback = fn;
 919 }
 920
 921 static void randomize_choice_values(struct symbol *csym)
 922 {
 923         struct property *prop;
 924         struct symbol *sym;
 925         struct expr *e;
 926         int cnt, def;
 927
 928         /*
 929          * If choice is mod then we may have more items slected
 930          * and if no then no-one.
 931          * In both cases stop.
 932          */
 933         if (csym->curr.tri != yes)
 934                 return;
 935
 936         prop = sym_get_choice_prop(csym);
 937
 938         /* count entries in choice block */
 939         cnt = 0;
 940         expr_list_for_each_sym(prop->expr, e, sym)
 941                 cnt++;
 942
 943         /*
 944          * find a random value and set it to yes,
 945          * set the rest to no so we have only one set
 946          */
 947         def = (rand() % cnt);
 948
 949         cnt = 0;
 950         expr_list_for_each_sym(prop->expr, e, sym) {
 951                 if (def == cnt++) {
 952                         sym->def[S_DEF_USER].tri = yes;
 953                         csym->def[S_DEF_USER].val = sym;
 954                 }
 955                 else {
 956                         sym->def[S_DEF_USER].tri = no;
 957                 }
 958         }
 959         csym->flags |= SYMBOL_DEF_USER;
 960         /* clear VALID to get value calculated */
 961         csym->flags &= ~(SYMBOL_VALID);
 962 }
 963
 964 static void set_all_choice_values(struct symbol *csym)
 965 {
 966         struct property *prop;
 967         struct symbol *sym;
 968         struct expr *e;
 969
 970         prop = sym_get_choice_prop(csym);
 971
 972         /*
 973          * Set all non-assinged choice values to no
 974          */
 975         expr_list_for_each_sym(prop->expr, e, sym) {
 976                 if (!sym_has_value(sym))
 977                         sym->def[S_DEF_USER].tri = no;
 978         }
 979         csym->flags |= SYMBOL_DEF_USER;
 980         /* clear VALID to get value calculated */
 981         csym->flags &= ~(SYMBOL_VALID);
 982 }
 983
 984 void conf_set_all_new_symbols(enum conf_def_mode mode)
 985 {
 986         struct symbol *sym, *csym;
 987         int i, cnt;
 988
 989         for_all_symbols(i, sym) {
 990                 if (sym_has_value(sym))
 991                         continue;
 992                 switch (sym_get_type(sym)) {
 993                 case S_BOOLEAN:
 994                 case S_TRISTATE:
 995                         switch (mode) {
 996                         case def_yes:
 997                                 sym->def[S_DEF_USER].tri = yes;
 998                                 break;
 999                         case def_mod:
1000                                 sym->def[S_DEF_USER].tri = mod;
1001                                 break;
1002                         case def_no:
1003                                 sym->def[S_DEF_USER].tri = no;
1004                                 break;
1005                         case def_random:
1006                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1007                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1008                                 break;
1009                         default:
1010                                 continue;
1011                         }
1012                         if (!(sym_is_choice(sym) && mode == def_random))
1013                                 sym->flags |= SYMBOL_DEF_USER;
1014                         break;
1015                 default:
1016                         break;
1017                 }
1018
1019         }
1020
1021         sym_clear_all_valid();
1022
1023         /*
1024          * We have different type of choice blocks.
1025          * If curr.tri equal to mod then we can select several
1026          * choice symbols in one block.
1027          * In this case we do nothing.
1028          * If curr.tri equal yes then only one symbol can be
1029          * selected in a choice block and we set it to yes,
1030          * and the rest to no.
1031          */
1032         for_all_symbols(i, csym) {
1033                 if (sym_has_value(csym) || !sym_is_choice(csym))
1034                         continue;
1035
1036                 sym_calc_value(csym);
1037                 if (mode == def_random)
1038                         randomize_choice_values(csym);
1039                 else
1040                         set_all_choice_values(csym);
1041         }
1042 }