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_, strlen(CONFIG_)))
 226                                 continue;
 227                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 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 + 2 + strlen(CONFIG_));
 235                                 if (!sym) {
 236                                         sym_add_change_count(1);
 237                                         goto setsym;
 238                                 }
 239                         } else {
 240                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 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_, strlen(CONFIG_)) == 0) {
 257                         p = strchr(line + strlen(CONFIG_), '=');
 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 + strlen(CONFIG_));
 269                                 if (!sym) {
 270                                         sym_add_change_count(1);
 271                                         goto setsym;
 272                                 }
 273                         } else {
 274                                 sym = sym_lookup(line + strlen(CONFIG_), 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 setsym:
 289                 if (sym && sym_is_choice_value(sym)) {
 290                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 291                         switch (sym->def[def].tri) {
 292                         case no:
 293                                 break;
 294                         case mod:
 295                                 if (cs->def[def].tri == yes) {
 296                                         conf_warning("%s creates inconsistent choice state", sym->name);
 297                                         cs->flags &= ~def_flags;
 298                                 }
 299                                 break;
 300                         case yes:
 301                                 if (cs->def[def].tri != no)
 302                                         conf_warning("override: %s changes choice state", sym->name);
 303                                 cs->def[def].val = sym;
 304                                 break;
 305                         }
 306                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 307                 }
 308         }
 309         fclose(in);
 310
 311         if (modules_sym)
 312                 sym_calc_value(modules_sym);
 313         return 0;
 314 }
 315
 316 int conf_read(const char *name)
 317 {
 318         struct symbol *sym, *choice_sym;
 319         struct property *prop;
 320         struct expr *e;
 321         int i, flags;
 322
 323         sym_set_change_count(0);
 324
 325         if (conf_read_simple(name, S_DEF_USER))
 326                 return 1;
 327
 328         for_all_symbols(i, sym) {
 329                 sym_calc_value(sym);
 330                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 331                         goto sym_ok;
 332                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 333                         /* check that calculated value agrees with saved value */
 334                         switch (sym->type) {
 335                         case S_BOOLEAN:
 336                         case S_TRISTATE:
 337                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 338                                         break;
 339                                 if (!sym_is_choice(sym))
 340                                         goto sym_ok;
 341                         default:
 342                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 343                                         goto sym_ok;
 344                                 break;
 345                         }
 346                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 347                         /* no previous value and not saved */
 348                         goto sym_ok;
 349                 conf_unsaved++;
 350                 /* maybe print value in verbose mode... */
 351         sym_ok:
 352                 if (!sym_is_choice(sym))
 353                         continue;
 354                 /* The choice symbol only has a set value (and thus is not new)
 355                  * if all its visible childs have values.
 356                  */
 357                 prop = sym_get_choice_prop(sym);
 358                 flags = sym->flags;
 359                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 360                         if (choice_sym->visible != no)
 361                                 flags &= choice_sym->flags;
 362                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 363         }
 364
 365         for_all_symbols(i, sym) {
 366                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 367                         /* Reset values of generates values, so they'll appear
 368                          * as new, if they should become visible, but that
 369                          * doesn't quite work if the Kconfig and the saved
 370                          * configuration disagree.
 371                          */
 372                         if (sym->visible == no && !conf_unsaved)
 373                                 sym->flags &= ~SYMBOL_DEF_USER;
 374                         switch (sym->type) {
 375                         case S_STRING:
 376                         case S_INT:
 377                         case S_HEX:
 378                                 /* Reset a string value if it's out of range */
 379                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 380                                         break;
 381                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 382                                 conf_unsaved++;
 383                                 break;
 384                         default:
 385                                 break;
 386                         }
 387                 }
 388         }
 389
 390         sym_add_change_count(conf_warnings || conf_unsaved);
 391
 392         return 0;
 393 }
 394
 395 /* Write a S_STRING */
 396 static void conf_write_string(bool headerfile, const char *name,
 397                               const char *str, FILE *out)
 398 {
 399         int l;
 400         if (headerfile)
 401                 fprintf(out, "#define %s%s \"", CONFIG_, name);
 402         else
 403                 fprintf(out, "%s%s=\"", CONFIG_, name);
 404
 405         while (1) {
 406                 l = strcspn(str, "\"\\");
 407                 if (l) {
 408                         xfwrite(str, l, 1, out);
 409                         str += l;
 410                 }
 411                 if (!*str)
 412                         break;
 413                 fprintf(out, "\\%c", *str++);
 414         }
 415         fputs("\"\n", out);
 416 }
 417
 418 static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
 419                               FILE *out, bool write_no)
 420 {
 421         const char *str;
 422
 423         switch (type) {
 424         case S_BOOLEAN:
 425         case S_TRISTATE:
 426                 switch (sym_get_tristate_value(sym)) {
 427                 case no:
 428                         if (write_no)
 429                                 fprintf(out, "# %s%s is not set\n",
 430                                     CONFIG_, sym->name);
 431                         break;
 432                 case mod:
 433                         fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
 434                         break;
 435                 case yes:
 436                         fprintf(out, "%s%s=y\n", CONFIG_, sym->name);
 437                         break;
 438                 }
 439                 break;
 440         case S_STRING:
 441                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 442                 break;
 443         case S_HEX:
 444         case S_INT:
 445                 str = sym_get_string_value(sym);
 446                 fprintf(out, "%s%s=%s\n", CONFIG_, sym->name, str);
 447                 break;
 448         case S_OTHER:
 449         case S_UNKNOWN:
 450                 break;
 451         }
 452 }
 453
 454 /*
 455  * Write out a minimal config.
 456  * All values that has default values are skipped as this is redundant.
 457  */
 458 int conf_write_defconfig(const char *filename)
 459 {
 460         struct symbol *sym;
 461         struct menu *menu;
 462         FILE *out;
 463
 464         out = fopen(filename, "w");
 465         if (!out)
 466                 return 1;
 467
 468         sym_clear_all_valid();
 469
 470         /* Traverse all menus to find all relevant symbols */
 471         menu = rootmenu.list;
 472
 473         while (menu != NULL)
 474         {
 475                 sym = menu->sym;
 476                 if (sym == NULL) {
 477                         if (!menu_is_visible(menu))
 478                                 goto next_menu;
 479                 } else if (!sym_is_choice(sym)) {
 480                         sym_calc_value(sym);
 481                         if (!(sym->flags & SYMBOL_WRITE))
 482                                 goto next_menu;
 483                         sym->flags &= ~SYMBOL_WRITE;
 484                         /* If we cannot change the symbol - skip */
 485                         if (!sym_is_changable(sym))
 486                                 goto next_menu;
 487                         /* If symbol equals to default value - skip */
 488                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 489                                 goto next_menu;
 490
 491                         /*
 492                          * If symbol is a choice value and equals to the
 493                          * default for a choice - skip.
 494                          * But only if value is bool and equal to "y" and
 495                          * choice is not "optional".
 496                          * (If choice is "optional" then all values can be "n")
 497                          */
 498                         if (sym_is_choice_value(sym)) {
 499                                 struct symbol *cs;
 500                                 struct symbol *ds;
 501
 502                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 503                                 ds = sym_choice_default(cs);
 504                                 if (!sym_is_optional(cs) && sym == ds) {
 505                                         if ((sym->type == S_BOOLEAN) &&
 506                                             sym_get_tristate_value(sym) == yes)
 507                                                 goto next_menu;
 508                                 }
 509                         }
 510                         conf_write_symbol(sym, sym->type, out, true);
 511                 }
 512 next_menu:
 513                 if (menu->list != NULL) {
 514                         menu = menu->list;
 515                 }
 516                 else if (menu->next != NULL) {
 517                         menu = menu->next;
 518                 } else {
 519                         while ((menu = menu->parent)) {
 520                                 if (menu->next != NULL) {
 521                                         menu = menu->next;
 522                                         break;
 523                                 }
 524                         }
 525                 }
 526         }
 527         fclose(out);
 528         return 0;
 529 }
 530
 531 int conf_write(const char *name)
 532 {
 533         FILE *out;
 534         struct symbol *sym;
 535         struct menu *menu;
 536         const char *basename;
 537         const char *str;
 538         char dirname[128], tmpname[128], newname[128];
 539         enum symbol_type type;
 540         time_t now;
 541         int use_timestamp = 1;
 542         char *env;
 543
 544         dirname[0] = 0;
 545         if (name && name[0]) {
 546                 struct stat st;
 547                 char *slash;
 548
 549                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 550                         strcpy(dirname, name);
 551                         strcat(dirname, "/");
 552                         basename = conf_get_configname();
 553                 } else if ((slash = strrchr(name, '/'))) {
 554                         int size = slash - name + 1;
 555                         memcpy(dirname, name, size);
 556                         dirname[size] = 0;
 557                         if (slash[1])
 558                                 basename = slash + 1;
 559                         else
 560                                 basename = conf_get_configname();
 561                 } else
 562                         basename = name;
 563         } else
 564                 basename = conf_get_configname();
 565
 566         sprintf(newname, "%s%s", dirname, basename);
 567         env = getenv("KCONFIG_OVERWRITECONFIG");
 568         if (!env || !*env) {
 569                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 570                 out = fopen(tmpname, "w");
 571         } else {
 572                 *tmpname = 0;
 573                 out = fopen(newname, "w");
 574         }
 575         if (!out)
 576                 return 1;
 577
 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                        "# %s\n"
 586                        "%s%s"
 587                        "#\n"),
 588                      rootmenu.prompt->text,
 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         time(&now);
 800         fprintf(out, "#\n"
 801                      "# Automatically generated make config: don't edit\n"
 802                      "# %s\n"
 803                      "# %s"
 804                      "#\n",
 805                      rootmenu.prompt->text, ctime(&now));
 806         fprintf(tristate, "#\n"
 807                           "# Automatically generated - do not edit\n"
 808                           "\n");
 809         fprintf(out_h, "/*\n"
 810                        " * Automatically generated C config: don't edit\n"
 811                        " * %s\n"
 812                        " * %s"
 813                        " */\n"
 814                        "#define AUTOCONF_INCLUDED\n",
 815                        rootmenu.prompt->text, ctime(&now));
 816
 817         for_all_symbols(i, sym) {
 818                 sym_calc_value(sym);
 819                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 820                         continue;
 821
 822                 /* write symbol to config file */
 823                 conf_write_symbol(sym, sym->type, out, false);
 824
 825                 /* update autoconf and tristate files */
 826                 switch (sym->type) {
 827                 case S_BOOLEAN:
 828                 case S_TRISTATE:
 829                         switch (sym_get_tristate_value(sym)) {
 830                         case no:
 831                                 break;
 832                         case mod:
 833                                 fprintf(tristate, "%s%s=M\n",
 834                                     CONFIG_, sym->name);
 835                                 fprintf(out_h, "#define %s%s_MODULE 1\n",
 836                                     CONFIG_, sym->name);
 837                                 break;
 838                         case yes:
 839                                 if (sym->type == S_TRISTATE)
 840                                         fprintf(tristate,"%s%s=Y\n",
 841                                             CONFIG_, sym->name);
 842                                 fprintf(out_h, "#define %s%s 1\n",
 843                                     CONFIG_, sym->name);
 844                                 break;
 845                         }
 846                         break;
 847                 case S_STRING:
 848                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
 849                         break;
 850                 case S_HEX:
 851                         str = sym_get_string_value(sym);
 852                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 853                                 fprintf(out_h, "#define %s%s 0x%s\n",
 854                                     CONFIG_, sym->name, str);
 855                                 break;
 856                         }
 857                 case S_INT:
 858                         str = sym_get_string_value(sym);
 859                         fprintf(out_h, "#define %s%s %s\n",
 860                             CONFIG_, sym->name, str);
 861                         break;
 862                 default:
 863                         break;
 864                 }
 865         }
 866         fclose(out);
 867         fclose(tristate);
 868         fclose(out_h);
 869
 870         name = getenv("KCONFIG_AUTOHEADER");
 871         if (!name)
 872                 name = "include/generated/autoconf.h";
 873         if (rename(".tmpconfig.h", name))
 874                 return 1;
 875         name = getenv("KCONFIG_TRISTATE");
 876         if (!name)
 877                 name = "include/config/tristate.conf";
 878         if (rename(".tmpconfig_tristate", name))
 879                 return 1;
 880         name = conf_get_autoconfig_name();
 881         /*
 882          * This must be the last step, kbuild has a dependency on auto.conf
 883          * and this marks the successful completion of the previous steps.
 884          */
 885         if (rename(".tmpconfig", name))
 886                 return 1;
 887
 888         return 0;
 889 }
 890
 891 static int sym_change_count;
 892 static void (*conf_changed_callback)(void);
 893
 894 void sym_set_change_count(int count)
 895 {
 896         int _sym_change_count = sym_change_count;
 897         sym_change_count = count;
 898         if (conf_changed_callback &&
 899             (bool)_sym_change_count != (bool)count)
 900                 conf_changed_callback();
 901 }
 902
 903 void sym_add_change_count(int count)
 904 {
 905         sym_set_change_count(count + sym_change_count);
 906 }
 907
 908 bool conf_get_changed(void)
 909 {
 910         return sym_change_count;
 911 }
 912
 913 void conf_set_changed_callback(void (*fn)(void))
 914 {
 915         conf_changed_callback = fn;
 916 }
 917
 918 static void randomize_choice_values(struct symbol *csym)
 919 {
 920         struct property *prop;
 921         struct symbol *sym;
 922         struct expr *e;
 923         int cnt, def;
 924
 925         /*
 926          * If choice is mod then we may have more items slected
 927          * and if no then no-one.
 928          * In both cases stop.
 929          */
 930         if (csym->curr.tri != yes)
 931                 return;
 932
 933         prop = sym_get_choice_prop(csym);
 934
 935         /* count entries in choice block */
 936         cnt = 0;
 937         expr_list_for_each_sym(prop->expr, e, sym)
 938                 cnt++;
 939
 940         /*
 941          * find a random value and set it to yes,
 942          * set the rest to no so we have only one set
 943          */
 944         def = (rand() % cnt);
 945
 946         cnt = 0;
 947         expr_list_for_each_sym(prop->expr, e, sym) {
 948                 if (def == cnt++) {
 949                         sym->def[S_DEF_USER].tri = yes;
 950                         csym->def[S_DEF_USER].val = sym;
 951                 }
 952                 else {
 953                         sym->def[S_DEF_USER].tri = no;
 954                 }
 955         }
 956         csym->flags |= SYMBOL_DEF_USER;
 957         /* clear VALID to get value calculated */
 958         csym->flags &= ~(SYMBOL_VALID);
 959 }
 960
 961 static void set_all_choice_values(struct symbol *csym)
 962 {
 963         struct property *prop;
 964         struct symbol *sym;
 965         struct expr *e;
 966
 967         prop = sym_get_choice_prop(csym);
 968
 969         /*
 970          * Set all non-assinged choice values to no
 971          */
 972         expr_list_for_each_sym(prop->expr, e, sym) {
 973                 if (!sym_has_value(sym))
 974                         sym->def[S_DEF_USER].tri = no;
 975         }
 976         csym->flags |= SYMBOL_DEF_USER;
 977         /* clear VALID to get value calculated */
 978         csym->flags &= ~(SYMBOL_VALID);
 979 }
 980
 981 void conf_set_all_new_symbols(enum conf_def_mode mode)
 982 {
 983         struct symbol *sym, *csym;
 984         int i, cnt;
 985
 986         for_all_symbols(i, sym) {
 987                 if (sym_has_value(sym))
 988                         continue;
 989                 switch (sym_get_type(sym)) {
 990                 case S_BOOLEAN:
 991                 case S_TRISTATE:
 992                         switch (mode) {
 993                         case def_yes:
 994                                 sym->def[S_DEF_USER].tri = yes;
 995                                 break;
 996                         case def_mod:
 997                                 sym->def[S_DEF_USER].tri = mod;
 998                                 break;
 999                         case def_no:
1000                                 sym->def[S_DEF_USER].tri = no;
1001                                 break;
1002                         case def_random:
1003                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1004                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1005                                 break;
1006                         default:
1007                                 continue;
1008                         }
1009                         if (!(sym_is_choice(sym) && mode == def_random))
1010                                 sym->flags |= SYMBOL_DEF_USER;
1011                         break;
1012                 default:
1013                         break;
1014                 }
1015
1016         }
1017
1018         sym_clear_all_valid();
1019
1020         /*
1021          * We have different type of choice blocks.
1022          * If curr.tri equal to mod then we can select several
1023          * choice symbols in one block.
1024          * In this case we do nothing.
1025          * If curr.tri equal yes then only one symbol can be
1026          * selected in a choice block and we set it to yes,
1027          * and the rest to no.
1028          */
1029         for_all_symbols(i, csym) {
1030                 if (sym_has_value(csym) || !sym_is_choice(csym))
1031                         continue;
1032
1033                 sym_calc_value(csym);
1034                 if (mode == def_random)
1035                         randomize_choice_values(csym);
1036                 else
1037                         set_all_choice_values(csym);
1038         }
1039 }