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 const char *conf_filename;
  23 static int conf_lineno, conf_warnings, conf_unsaved;
  24
  25 const char conf_defname[] = "arch/$ARCH/defconfig";
  26
  27 static void conf_warning(const char *fmt, ...)
  28 {
  29         va_list ap;
  30         va_start(ap, fmt);
  31         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  32         vfprintf(stderr, fmt, ap);
  33         fprintf(stderr, "\n");
  34         va_end(ap);
  35         conf_warnings++;
  36 }
  37
  38 const char *conf_get_configname(void)
  39 {
  40         char *name = getenv("KCONFIG_CONFIG");
  41
  42         return name ? name : ".config";
  43 }
  44
  45 const char *conf_get_autoconfig_name(void)
  46 {
  47         char *name = getenv("KCONFIG_AUTOCONFIG");
  48
  49         return name ? name : "include/config/auto.conf";
  50 }
  51
  52 static char *conf_expand_value(const char *in)
  53 {
  54         struct symbol *sym;
  55         const char *src;
  56         static char res_value[SYMBOL_MAXLENGTH];
  57         char *dst, name[SYMBOL_MAXLENGTH];
  58
  59         res_value[0] = 0;
  60         dst = name;
  61         while ((src = strchr(in, '$'))) {
  62                 strncat(res_value, in, src - in);
  63                 src++;
  64                 dst = name;
  65                 while (isalnum(*src) || *src == '_')
  66                         *dst++ = *src++;
  67                 *dst = 0;
  68                 sym = sym_lookup(name, 0);
  69                 sym_calc_value(sym);
  70                 strcat(res_value, sym_get_string_value(sym));
  71                 in = src;
  72         }
  73         strcat(res_value, in);
  74
  75         return res_value;
  76 }
  77
  78 char *conf_get_default_confname(void)
  79 {
  80         struct stat buf;
  81         static char fullname[PATH_MAX+1];
  82         char *env, *name;
  83
  84         name = conf_expand_value(conf_defname);
  85         env = getenv(SRCTREE);
  86         if (env) {
  87                 sprintf(fullname, "%s/%s", env, name);
  88                 if (!stat(fullname, &buf))
  89                         return fullname;
  90         }
  91         return name;
  92 }
  93
  94 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
  95 {
  96         char *p2;
  97
  98         switch (sym->type) {
  99         case S_TRISTATE:
 100                 if (p[0] == 'm') {
 101                         sym->def[def].tri = mod;
 102                         sym->flags |= def_flags;
 103                         break;
 104                 }
 105         case S_BOOLEAN:
 106                 if (p[0] == 'y') {
 107                         sym->def[def].tri = yes;
 108                         sym->flags |= def_flags;
 109                         break;
 110                 }
 111                 if (p[0] == 'n') {
 112                         sym->def[def].tri = no;
 113                         sym->flags |= def_flags;
 114                         break;
 115                 }
 116                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 117                 break;
 118         case S_OTHER:
 119                 if (*p != '"') {
 120                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 121                                 ;
 122                         sym->type = S_STRING;
 123                         goto done;
 124                 }
 125         case S_STRING:
 126                 if (*p++ != '"')
 127                         break;
 128                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 129                         if (*p2 == '"') {
 130                                 *p2 = 0;
 131                                 break;
 132                         }
 133                         memmove(p2, p2 + 1, strlen(p2));
 134                 }
 135                 if (!p2) {
 136                         conf_warning("invalid string found");
 137                         return 1;
 138                 }
 139         case S_INT:
 140         case S_HEX:
 141         done:
 142                 if (sym_string_valid(sym, p)) {
 143                         sym->def[def].val = strdup(p);
 144                         sym->flags |= def_flags;
 145                 } else {
 146                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 147                         return 1;
 148                 }
 149                 break;
 150         default:
 151                 ;
 152         }
 153         return 0;
 154 }
 155
 156 int conf_read_simple(const char *name, int def)
 157 {
 158         FILE *in = NULL;
 159         char line[1024];
 160         char *p, *p2;
 161         struct symbol *sym;
 162         int i, def_flags;
 163
 164         if (name) {
 165                 in = zconf_fopen(name);
 166         } else {
 167                 struct property *prop;
 168
 169                 name = conf_get_configname();
 170                 in = zconf_fopen(name);
 171                 if (in)
 172                         goto load;
 173                 sym_add_change_count(1);
 174                 if (!sym_defconfig_list) {
 175                         if (modules_sym)
 176                                 sym_calc_value(modules_sym);
 177                         return 1;
 178                 }
 179
 180                 for_all_defaults(sym_defconfig_list, prop) {
 181                         if (expr_calc_value(prop->visible.expr) == no ||
 182                             prop->expr->type != E_SYMBOL)
 183                                 continue;
 184                         name = conf_expand_value(prop->expr->left.sym->name);
 185                         in = zconf_fopen(name);
 186                         if (in) {
 187                                 printf(_("#\n"
 188                                          "# using defaults found in %s\n"
 189                                          "#\n"), name);
 190                                 goto load;
 191                         }
 192                 }
 193         }
 194         if (!in)
 195                 return 1;
 196
 197 load:
 198         conf_filename = name;
 199         conf_lineno = 0;
 200         conf_warnings = 0;
 201         conf_unsaved = 0;
 202
 203         def_flags = SYMBOL_DEF << def;
 204         for_all_symbols(i, sym) {
 205                 sym->flags |= SYMBOL_CHANGED;
 206                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 207                 if (sym_is_choice(sym))
 208                         sym->flags |= def_flags;
 209                 switch (sym->type) {
 210                 case S_INT:
 211                 case S_HEX:
 212                 case S_STRING:
 213                         if (sym->def[def].val)
 214                                 free(sym->def[def].val);
 215                 default:
 216                         sym->def[def].val = NULL;
 217                         sym->def[def].tri = no;
 218                 }
 219         }
 220
 221         while (fgets(line, sizeof(line), in)) {
 222                 conf_lineno++;
 223                 sym = NULL;
 224                 if (line[0] == '#') {
 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                 } else if (memcmp(line, "CONFIG_", 7) == 0) {
 257                         p = strchr(line + 7, '=');
 258                         if (!p)
 259                                 continue;
 260                         *p++ = 0;
 261                         p2 = strchr(p, '\n');
 262                         if (p2) {
 263                                 *p2-- = 0;
 264                                 if (*p2 == '\r')
 265                                         *p2 = 0;
 266                         }
 267                         if (def == S_DEF_USER) {
 268                                 sym = sym_find(line + 7);
 269                                 if (!sym) {
 270                                         sym_add_change_count(1);
 271                                         break;
 272                                 }
 273                         } else {
 274                                 sym = sym_lookup(line + 7, 0);
 275                                 if (sym->type == S_UNKNOWN)
 276                                         sym->type = S_OTHER;
 277                         }
 278                         if (sym->flags & def_flags) {
 279                                 conf_warning("override: reassigning to symbol %s", sym->name);
 280                         }
 281                         if (conf_set_sym_val(sym, def, def_flags, p))
 282                                 continue;
 283                 } else {
 284                         if (line[0] != '\r' && line[0] != '\n')
 285                                 conf_warning("unexpected data");
 286                         continue;
 287                 }
 288                 if (sym && sym_is_choice_value(sym)) {
 289                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 290                         switch (sym->def[def].tri) {
 291                         case no:
 292                                 break;
 293                         case mod:
 294                                 if (cs->def[def].tri == yes) {
 295                                         conf_warning("%s creates inconsistent choice state", sym->name);
 296                                         cs->flags &= ~def_flags;
 297                                 }
 298                                 break;
 299                         case yes:
 300                                 if (cs->def[def].tri != no)
 301                                         conf_warning("override: %s changes choice state", sym->name);
 302                                 cs->def[def].val = sym;
 303                                 break;
 304                         }
 305                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 306                 }
 307         }
 308         fclose(in);
 309
 310         if (modules_sym)
 311                 sym_calc_value(modules_sym);
 312         return 0;
 313 }
 314
 315 int conf_read(const char *name)
 316 {
 317         struct symbol *sym, *choice_sym;
 318         struct property *prop;
 319         struct expr *e;
 320         int i, flags;
 321
 322         sym_set_change_count(0);
 323
 324         if (conf_read_simple(name, S_DEF_USER))
 325                 return 1;
 326
 327         for_all_symbols(i, sym) {
 328                 sym_calc_value(sym);
 329                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 330                         goto sym_ok;
 331                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 332                         /* check that calculated value agrees with saved value */
 333                         switch (sym->type) {
 334                         case S_BOOLEAN:
 335                         case S_TRISTATE:
 336                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 337                                         break;
 338                                 if (!sym_is_choice(sym))
 339                                         goto sym_ok;
 340                         default:
 341                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 342                                         goto sym_ok;
 343                                 break;
 344                         }
 345                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 346                         /* no previous value and not saved */
 347                         goto sym_ok;
 348                 conf_unsaved++;
 349                 /* maybe print value in verbose mode... */
 350         sym_ok:
 351                 if (!sym_is_choice(sym))
 352                         continue;
 353                 /* The choice symbol only has a set value (and thus is not new)
 354                  * if all its visible childs have values.
 355                  */
 356                 prop = sym_get_choice_prop(sym);
 357                 flags = sym->flags;
 358                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 359                         if (choice_sym->visible != no)
 360                                 flags &= choice_sym->flags;
 361                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 362         }
 363
 364         for_all_symbols(i, sym) {
 365                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 366                         /* Reset values of generates values, so they'll appear
 367                          * as new, if they should become visible, but that
 368                          * doesn't quite work if the Kconfig and the saved
 369                          * configuration disagree.
 370                          */
 371                         if (sym->visible == no && !conf_unsaved)
 372                                 sym->flags &= ~SYMBOL_DEF_USER;
 373                         switch (sym->type) {
 374                         case S_STRING:
 375                         case S_INT:
 376                         case S_HEX:
 377                                 /* Reset a string value if it's out of range */
 378                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 379                                         break;
 380                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 381                                 conf_unsaved++;
 382                                 break;
 383                         default:
 384                                 break;
 385                         }
 386                 }
 387         }
 388
 389         sym_add_change_count(conf_warnings || conf_unsaved);
 390
 391         return 0;
 392 }
 393
 394 /* Write a S_STRING */
 395 static void conf_write_string(bool headerfile, const char *name,
 396                               const char *str, FILE *out)
 397 {
 398         int l;
 399         if (headerfile)
 400                 fprintf(out, "#define CONFIG_%s \"", name);
 401         else
 402                 fprintf(out, "CONFIG_%s=\"", name);
 403
 404         while (1) {
 405                 l = strcspn(str, "\"\\");
 406                 if (l) {
 407                         xfwrite(str, l, 1, out);
 408                         str += l;
 409                 }
 410                 if (!*str)
 411                         break;
 412                 fprintf(out, "\\%c", *str++);
 413         }
 414         fputs("\"\n", out);
 415 }
 416
 417 static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
 418                               FILE *out, bool write_no)
 419 {
 420         const char *str;
 421
 422         switch (type) {
 423         case S_BOOLEAN:
 424         case S_TRISTATE:
 425                 switch (sym_get_tristate_value(sym)) {
 426                 case no:
 427                         if (write_no)
 428                                 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 429                         break;
 430                 case mod:
 431                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 432                         break;
 433                 case yes:
 434                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 435                         break;
 436                 }
 437                 break;
 438         case S_STRING:
 439                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 440                 break;
 441         case S_HEX:
 442         case S_INT:
 443                 str = sym_get_string_value(sym);
 444                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 445                 break;
 446         case S_OTHER:
 447         case S_UNKNOWN:
 448                 break;
 449         }
 450 }
 451
 452 /*
 453  * Write out a minimal config.
 454  * All values that has default values are skipped as this is redundant.
 455  */
 456 int conf_write_defconfig(const char *filename)
 457 {
 458         struct symbol *sym;
 459         struct menu *menu;
 460         FILE *out;
 461
 462         out = fopen(filename, "w");
 463         if (!out)
 464                 return 1;
 465
 466         sym_clear_all_valid();
 467
 468         /* Traverse all menus to find all relevant symbols */
 469         menu = rootmenu.list;
 470
 471         while (menu != NULL)
 472         {
 473                 sym = menu->sym;
 474                 if (sym == NULL) {
 475                         if (!menu_is_visible(menu))
 476                                 goto next_menu;
 477                 } else if (!sym_is_choice(sym)) {
 478                         sym_calc_value(sym);
 479                         if (!(sym->flags & SYMBOL_WRITE))
 480                                 goto next_menu;
 481                         sym->flags &= ~SYMBOL_WRITE;
 482                         /* If we cannot change the symbol - skip */
 483                         if (!sym_is_changable(sym))
 484                                 goto next_menu;
 485                         /* If symbol equals to default value - skip */
 486                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 487                                 goto next_menu;
 488
 489                         /*
 490                          * If symbol is a choice value and equals to the
 491                          * default for a choice - skip.
 492                          * But only if value is bool and equal to "y" and
 493                          * choice is not "optional".
 494                          * (If choice is "optional" then all values can be "n")
 495                          */
 496                         if (sym_is_choice_value(sym)) {
 497                                 struct symbol *cs;
 498                                 struct symbol *ds;
 499
 500                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 501                                 ds = sym_choice_default(cs);
 502                                 if (!sym_is_optional(cs) && sym == ds) {
 503                                         if ((sym->type == S_BOOLEAN) &&
 504                                             sym_get_tristate_value(sym) == yes)
 505                                                 goto next_menu;
 506                                 }
 507                         }
 508                         conf_write_symbol(sym, sym->type, out, true);
 509                 }
 510 next_menu:
 511                 if (menu->list != NULL) {
 512                         menu = menu->list;
 513                 }
 514                 else if (menu->next != NULL) {
 515                         menu = menu->next;
 516                 } else {
 517                         while ((menu = menu->parent)) {
 518                                 if (menu->next != NULL) {
 519                                         menu = menu->next;
 520                                         break;
 521                                 }
 522                         }
 523                 }
 524         }
 525         fclose(out);
 526         return 0;
 527 }
 528
 529 int conf_write(const char *name)
 530 {
 531         FILE *out;
 532         struct symbol *sym;
 533         struct menu *menu;
 534         const char *basename;
 535         const char *str;
 536         char dirname[128], tmpname[128], newname[128];
 537         enum symbol_type type;
 538         time_t now;
 539         int use_timestamp = 1;
 540         char *env;
 541
 542         dirname[0] = 0;
 543         if (name && name[0]) {
 544                 struct stat st;
 545                 char *slash;
 546
 547                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 548                         strcpy(dirname, name);
 549                         strcat(dirname, "/");
 550                         basename = conf_get_configname();
 551                 } else if ((slash = strrchr(name, '/'))) {
 552                         int size = slash - name + 1;
 553                         memcpy(dirname, name, size);
 554                         dirname[size] = 0;
 555                         if (slash[1])
 556                                 basename = slash + 1;
 557                         else
 558                                 basename = conf_get_configname();
 559                 } else
 560                         basename = name;
 561         } else
 562                 basename = conf_get_configname();
 563
 564         sprintf(newname, "%s%s", dirname, basename);
 565         env = getenv("KCONFIG_OVERWRITECONFIG");
 566         if (!env || !*env) {
 567                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 568                 out = fopen(tmpname, "w");
 569         } else {
 570                 *tmpname = 0;
 571                 out = fopen(newname, "w");
 572         }
 573         if (!out)
 574                 return 1;
 575
 576         sym = sym_lookup("KERNELVERSION", 0);
 577         sym_calc_value(sym);
 578         time(&now);
 579         env = getenv("KCONFIG_NOTIMESTAMP");
 580         if (env && *env)
 581                 use_timestamp = 0;
 582
 583         fprintf(out, _("#\n"
 584                        "# Automatically generated make config: don't edit\n"
 585                        "# Linux kernel version: %s\n"
 586                        "%s%s"
 587                        "#\n"),
 588                      sym_get_string_value(sym),
 589                      use_timestamp ? "# " : "",
 590                      use_timestamp ? ctime(&now) : "");
 591
 592         if (!conf_get_changed())
 593                 sym_clear_all_valid();
 594
 595         menu = rootmenu.list;
 596         while (menu) {
 597                 sym = menu->sym;
 598                 if (!sym) {
 599                         if (!menu_is_visible(menu))
 600                                 goto next;
 601                         str = menu_get_prompt(menu);
 602                         fprintf(out, "\n"
 603                                      "#\n"
 604                                      "# %s\n"
 605                                      "#\n", str);
 606                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 607                         sym_calc_value(sym);
 608                         if (!(sym->flags & SYMBOL_WRITE))
 609                                 goto next;
 610                         sym->flags &= ~SYMBOL_WRITE;
 611                         type = sym->type;
 612                         if (type == S_TRISTATE) {
 613                                 sym_calc_value(modules_sym);
 614                                 if (modules_sym->curr.tri == no)
 615                                         type = S_BOOLEAN;
 616                         }
 617                         /* Write config symbol to file */
 618                         conf_write_symbol(sym, type, out, true);
 619                 }
 620
 621 next:
 622                 if (menu->list) {
 623                         menu = menu->list;
 624                         continue;
 625                 }
 626                 if (menu->next)
 627                         menu = menu->next;
 628                 else while ((menu = menu->parent)) {
 629                         if (menu->next) {
 630                                 menu = menu->next;
 631                                 break;
 632                         }
 633                 }
 634         }
 635         fclose(out);
 636
 637         if (*tmpname) {
 638                 strcat(dirname, basename);
 639                 strcat(dirname, ".old");
 640                 rename(newname, dirname);
 641                 if (rename(tmpname, newname))
 642                         return 1;
 643         }
 644
 645         printf(_("#\n"
 646                  "# configuration written to %s\n"
 647                  "#\n"), newname);
 648
 649         sym_set_change_count(0);
 650
 651         return 0;
 652 }
 653
 654 static int conf_split_config(void)
 655 {
 656         const char *name;
 657         char path[128];
 658         char *s, *d, c;
 659         struct symbol *sym;
 660         struct stat sb;
 661         int res, i, fd;
 662
 663         name = conf_get_autoconfig_name();
 664         conf_read_simple(name, S_DEF_AUTO);
 665
 666         if (chdir("include/config"))
 667                 return 1;
 668
 669         res = 0;
 670         for_all_symbols(i, sym) {
 671                 sym_calc_value(sym);
 672                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 673                         continue;
 674                 if (sym->flags & SYMBOL_WRITE) {
 675                         if (sym->flags & SYMBOL_DEF_AUTO) {
 676                                 /*
 677                                  * symbol has old and new value,
 678                                  * so compare them...
 679                                  */
 680                                 switch (sym->type) {
 681                                 case S_BOOLEAN:
 682                                 case S_TRISTATE:
 683                                         if (sym_get_tristate_value(sym) ==
 684                                             sym->def[S_DEF_AUTO].tri)
 685                                                 continue;
 686                                         break;
 687                                 case S_STRING:
 688                                 case S_HEX:
 689                                 case S_INT:
 690                                         if (!strcmp(sym_get_string_value(sym),
 691                                                     sym->def[S_DEF_AUTO].val))
 692                                                 continue;
 693                                         break;
 694                                 default:
 695                                         break;
 696                                 }
 697                         } else {
 698                                 /*
 699                                  * If there is no old value, only 'no' (unset)
 700                                  * is allowed as new value.
 701                                  */
 702                                 switch (sym->type) {
 703                                 case S_BOOLEAN:
 704                                 case S_TRISTATE:
 705                                         if (sym_get_tristate_value(sym) == no)
 706                                                 continue;
 707                                         break;
 708                                 default:
 709                                         break;
 710                                 }
 711                         }
 712                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 713                         /* There is neither an old nor a new value. */
 714                         continue;
 715                 /* else
 716                  *      There is an old value, but no new value ('no' (unset)
 717                  *      isn't saved in auto.conf, so the old value is always
 718                  *      different from 'no').
 719                  */
 720
 721                 /* Replace all '_' and append ".h" */
 722                 s = sym->name;
 723                 d = path;
 724                 while ((c = *s++)) {
 725                         c = tolower(c);
 726                         *d++ = (c == '_') ? '/' : c;
 727                 }
 728                 strcpy(d, ".h");
 729
 730                 /* Assume directory path already exists. */
 731                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 732                 if (fd == -1) {
 733                         if (errno != ENOENT) {
 734                                 res = 1;
 735                                 break;
 736                         }
 737                         /*
 738                          * Create directory components,
 739                          * unless they exist already.
 740                          */
 741                         d = path;
 742                         while ((d = strchr(d, '/'))) {
 743                                 *d = 0;
 744                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 745                                         res = 1;
 746                                         goto out;
 747                                 }
 748                                 *d++ = '/';
 749                         }
 750                         /* Try it again. */
 751                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 752                         if (fd == -1) {
 753                                 res = 1;
 754                                 break;
 755                         }
 756                 }
 757                 close(fd);
 758         }
 759 out:
 760         if (chdir("../.."))
 761                 return 1;
 762
 763         return res;
 764 }
 765
 766 int conf_write_autoconf(void)
 767 {
 768         struct symbol *sym;
 769         const char *str;
 770         const char *name;
 771         FILE *out, *tristate, *out_h;
 772         time_t now;
 773         int i;
 774
 775         sym_clear_all_valid();
 776
 777         file_write_dep("include/config/auto.conf.cmd");
 778
 779         if (conf_split_config())
 780                 return 1;
 781
 782         out = fopen(".tmpconfig", "w");
 783         if (!out)
 784                 return 1;
 785
 786         tristate = fopen(".tmpconfig_tristate", "w");
 787         if (!tristate) {
 788                 fclose(out);
 789                 return 1;
 790         }
 791
 792         out_h = fopen(".tmpconfig.h", "w");
 793         if (!out_h) {
 794                 fclose(out);
 795                 fclose(tristate);
 796                 return 1;
 797         }
 798
 799         sym = sym_lookup("KERNELVERSION", 0);
 800         sym_calc_value(sym);
 801         time(&now);
 802         fprintf(out, "#\n"
 803                      "# Automatically generated make config: don't edit\n"
 804                      "# Linux kernel version: %s\n"
 805                      "# %s"
 806                      "#\n",
 807                      sym_get_string_value(sym), ctime(&now));
 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                        " * Linux kernel version: %s\n"
 814                        " * %s"
 815                        " */\n"
 816                        "#define AUTOCONF_INCLUDED\n",
 817                        sym_get_string_value(sym), ctime(&now));
 818
 819         for_all_symbols(i, sym) {
 820                 sym_calc_value(sym);
 821                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 822                         continue;
 823
 824                 /* write symbol to config file */
 825                 conf_write_symbol(sym, sym->type, out, false);
 826
 827                 /* update autoconf and tristate files */
 828                 switch (sym->type) {
 829                 case S_BOOLEAN:
 830                 case S_TRISTATE:
 831                         switch (sym_get_tristate_value(sym)) {
 832                         case no:
 833                                 break;
 834                         case mod:
 835                                 fprintf(tristate, "CONFIG_%s=M\n", sym->name);
 836                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 837                                 break;
 838                         case yes:
 839                                 if (sym->type == S_TRISTATE)
 840                                         fprintf(tristate, "CONFIG_%s=Y\n",
 841                                                         sym->name);
 842                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 843                                 break;
 844                         }
 845                         break;
 846                 case S_STRING:
 847                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
 848                         break;
 849                 case S_HEX:
 850                         str = sym_get_string_value(sym);
 851                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 852                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 853                                 break;
 854                         }
 855                 case S_INT:
 856                         str = sym_get_string_value(sym);
 857                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 858                         break;
 859                 default:
 860                         break;
 861                 }
 862         }
 863         fclose(out);
 864         fclose(tristate);
 865         fclose(out_h);
 866
 867         name = getenv("KCONFIG_AUTOHEADER");
 868         if (!name)
 869                 name = "include/generated/autoconf.h";
 870         if (rename(".tmpconfig.h", name))
 871                 return 1;
 872         name = getenv("KCONFIG_TRISTATE");
 873         if (!name)
 874                 name = "include/config/tristate.conf";
 875         if (rename(".tmpconfig_tristate", name))
 876                 return 1;
 877         name = conf_get_autoconfig_name();
 878         /*
 879          * This must be the last step, kbuild has a dependency on auto.conf
 880          * and this marks the successful completion of the previous steps.
 881          */
 882         if (rename(".tmpconfig", name))
 883                 return 1;
 884
 885         return 0;
 886 }
 887
 888 static int sym_change_count;
 889 static void (*conf_changed_callback)(void);
 890
 891 void sym_set_change_count(int count)
 892 {
 893         int _sym_change_count = sym_change_count;
 894         sym_change_count = count;
 895         if (conf_changed_callback &&
 896             (bool)_sym_change_count != (bool)count)
 897                 conf_changed_callback();
 898 }
 899
 900 void sym_add_change_count(int count)
 901 {
 902         sym_set_change_count(count + sym_change_count);
 903 }
 904
 905 bool conf_get_changed(void)
 906 {
 907         return sym_change_count;
 908 }
 909
 910 void conf_set_changed_callback(void (*fn)(void))
 911 {
 912         conf_changed_callback = fn;
 913 }
 914
 915 static void randomize_choice_values(struct symbol *csym)
 916 {
 917         struct property *prop;
 918         struct symbol *sym;
 919         struct expr *e;
 920         int cnt, def;
 921
 922         /*
 923          * If choice is mod then we may have more items slected
 924          * and if no then no-one.
 925          * In both cases stop.
 926          */
 927         if (csym->curr.tri != yes)
 928                 return;
 929
 930         prop = sym_get_choice_prop(csym);
 931
 932         /* count entries in choice block */
 933         cnt = 0;
 934         expr_list_for_each_sym(prop->expr, e, sym)
 935                 cnt++;
 936
 937         /*
 938          * find a random value and set it to yes,
 939          * set the rest to no so we have only one set
 940          */
 941         def = (rand() % cnt);
 942
 943         cnt = 0;
 944         expr_list_for_each_sym(prop->expr, e, sym) {
 945                 if (def == cnt++) {
 946                         sym->def[S_DEF_USER].tri = yes;
 947                         csym->def[S_DEF_USER].val = sym;
 948                 }
 949                 else {
 950                         sym->def[S_DEF_USER].tri = no;
 951                 }
 952         }
 953         csym->flags |= SYMBOL_DEF_USER;
 954         /* clear VALID to get value calculated */
 955         csym->flags &= ~(SYMBOL_VALID);
 956 }
 957
 958 static void set_all_choice_values(struct symbol *csym)
 959 {
 960         struct property *prop;
 961         struct symbol *sym;
 962         struct expr *e;
 963
 964         prop = sym_get_choice_prop(csym);
 965
 966         /*
 967          * Set all non-assinged choice values to no
 968          */
 969         expr_list_for_each_sym(prop->expr, e, sym) {
 970                 if (!sym_has_value(sym))
 971                         sym->def[S_DEF_USER].tri = no;
 972         }
 973         csym->flags |= SYMBOL_DEF_USER;
 974         /* clear VALID to get value calculated */
 975         csym->flags &= ~(SYMBOL_VALID);
 976 }
 977
 978 void conf_set_all_new_symbols(enum conf_def_mode mode)
 979 {
 980         struct symbol *sym, *csym;
 981         int i, cnt;
 982
 983         for_all_symbols(i, sym) {
 984                 if (sym_has_value(sym))
 985                         continue;
 986                 switch (sym_get_type(sym)) {
 987                 case S_BOOLEAN:
 988                 case S_TRISTATE:
 989                         switch (mode) {
 990                         case def_yes:
 991                                 sym->def[S_DEF_USER].tri = yes;
 992                                 break;
 993                         case def_mod:
 994                                 sym->def[S_DEF_USER].tri = mod;
 995                                 break;
 996                         case def_no:
 997                                 sym->def[S_DEF_USER].tri = no;
 998                                 break;
 999                         case def_random:
1000                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1001                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1002                                 break;
1003                         default:
1004                                 continue;
1005                         }
1006                         if (!(sym_is_choice(sym) && mode == def_random))
1007                                 sym->flags |= SYMBOL_DEF_USER;
1008                         break;
1009                 default:
1010                         break;
1011                 }
1012
1013         }
1014
1015         sym_clear_all_valid();
1016
1017         /*
1018          * We have different type of choice blocks.
1019          * If curr.tri equal to mod then we can select several
1020          * choice symbols in one block.
1021          * In this case we do nothing.
1022          * If curr.tri equal yes then only one symbol can be
1023          * selected in a choice block and we set it to yes,
1024          * and the rest to no.
1025          */
1026         for_all_symbols(i, csym) {
1027                 if (sym_has_value(csym) || !sym_is_choice(csym))
1028                         continue;
1029
1030                 sym_calc_value(csym);
1031                 if (mode == def_random)
1032                         randomize_choice_values(csym);
1033                 else
1034                         set_all_choice_values(csym);
1035         }
1036 }