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/$ARCH/defconfig";
  25
  26 static void conf_warning(const char *fmt, ...)
  27 {
  28         va_list ap;
  29         va_start(ap, fmt);
  30         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  31         vfprintf(stderr, fmt, ap);
  32         fprintf(stderr, "\n");
  33         va_end(ap);
  34         conf_warnings++;
  35 }
  36
  37 const char *conf_get_configname(void)
  38 {
  39         char *name = getenv("KCONFIG_CONFIG");
  40
  41         return name ? name : ".config";
  42 }
  43
  44 static char *conf_expand_value(const char *in)
  45 {
  46         struct symbol *sym;
  47         const char *src;
  48         static char res_value[SYMBOL_MAXLENGTH];
  49         char *dst, name[SYMBOL_MAXLENGTH];
  50
  51         res_value[0] = 0;
  52         dst = name;
  53         while ((src = strchr(in, '$'))) {
  54                 strncat(res_value, in, src - in);
  55                 src++;
  56                 dst = name;
  57                 while (isalnum(*src) || *src == '_')
  58                         *dst++ = *src++;
  59                 *dst = 0;
  60                 sym = sym_lookup(name, 0);
  61                 sym_calc_value(sym);
  62                 strcat(res_value, sym_get_string_value(sym));
  63                 in = src;
  64         }
  65         strcat(res_value, in);
  66
  67         return res_value;
  68 }
  69
  70 char *conf_get_default_confname(void)
  71 {
  72         struct stat buf;
  73         static char fullname[PATH_MAX+1];
  74         char *env, *name;
  75
  76         name = conf_expand_value(conf_defname);
  77         env = getenv(SRCTREE);
  78         if (env) {
  79                 sprintf(fullname, "%s/%s", env, name);
  80                 if (!stat(fullname, &buf))
  81                         return fullname;
  82         }
  83         return name;
  84 }
  85
  86 int conf_read_simple(const char *name, int def)
  87 {
  88         FILE *in = NULL;
  89         char line[1024];
  90         char *p, *p2;
  91         struct symbol *sym;
  92         int i, def_flags;
  93
  94         if (name) {
  95                 in = zconf_fopen(name);
  96         } else {
  97                 struct property *prop;
  98
  99                 name = conf_get_configname();
 100                 in = zconf_fopen(name);
 101                 if (in)
 102                         goto load;
 103                 sym_add_change_count(1);
 104                 if (!sym_defconfig_list)
 105                         return 1;
 106
 107                 for_all_defaults(sym_defconfig_list, prop) {
 108                         if (expr_calc_value(prop->visible.expr) == no ||
 109                             prop->expr->type != E_SYMBOL)
 110                                 continue;
 111                         name = conf_expand_value(prop->expr->left.sym->name);
 112                         in = zconf_fopen(name);
 113                         if (in) {
 114                                 printf(_("#\n"
 115                                          "# using defaults found in %s\n"
 116                                          "#\n"), name);
 117                                 goto load;
 118                         }
 119                 }
 120         }
 121         if (!in)
 122                 return 1;
 123
 124 load:
 125         conf_filename = name;
 126         conf_lineno = 0;
 127         conf_warnings = 0;
 128         conf_unsaved = 0;
 129
 130         def_flags = SYMBOL_DEF << def;
 131         for_all_symbols(i, sym) {
 132                 sym->flags |= SYMBOL_CHANGED;
 133                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 134                 if (sym_is_choice(sym))
 135                         sym->flags |= def_flags;
 136                 switch (sym->type) {
 137                 case S_INT:
 138                 case S_HEX:
 139                 case S_STRING:
 140                         if (sym->def[def].val)
 141                                 free(sym->def[def].val);
 142                 default:
 143                         sym->def[def].val = NULL;
 144                         sym->def[def].tri = no;
 145                 }
 146         }
 147
 148         while (fgets(line, sizeof(line), in)) {
 149                 conf_lineno++;
 150                 sym = NULL;
 151                 switch (line[0]) {
 152                 case '#':
 153                         if (memcmp(line + 2, "CONFIG_", 7))
 154                                 continue;
 155                         p = strchr(line + 9, ' ');
 156                         if (!p)
 157                                 continue;
 158                         *p++ = 0;
 159                         if (strncmp(p, "is not set", 10))
 160                                 continue;
 161                         if (def == S_DEF_USER) {
 162                                 sym = sym_find(line + 9);
 163                                 if (!sym) {
 164                                         conf_warning("trying to assign nonexistent symbol %s", line + 9);
 165                                         break;
 166                                 }
 167                         } else {
 168                                 sym = sym_lookup(line + 9, 0);
 169                                 if (sym->type == S_UNKNOWN)
 170                                         sym->type = S_BOOLEAN;
 171                         }
 172                         if (sym->flags & def_flags) {
 173                                 conf_warning("trying to reassign symbol %s", sym->name);
 174                                 break;
 175                         }
 176                         switch (sym->type) {
 177                         case S_BOOLEAN:
 178                         case S_TRISTATE:
 179                                 sym->def[def].tri = no;
 180                                 sym->flags |= def_flags;
 181                                 break;
 182                         default:
 183                                 ;
 184                         }
 185                         break;
 186                 case 'C':
 187                         if (memcmp(line, "CONFIG_", 7)) {
 188                                 conf_warning("unexpected data");
 189                                 continue;
 190                         }
 191                         p = strchr(line + 7, '=');
 192                         if (!p)
 193                                 continue;
 194                         *p++ = 0;
 195                         p2 = strchr(p, '\n');
 196                         if (p2) {
 197                                 *p2-- = 0;
 198                                 if (*p2 == '\r')
 199                                         *p2 = 0;
 200                         }
 201                         if (def == S_DEF_USER) {
 202                                 sym = sym_find(line + 7);
 203                                 if (!sym) {
 204                                         conf_warning("trying to assign nonexistent symbol %s", line + 7);
 205                                         break;
 206                                 }
 207                         } else {
 208                                 sym = sym_lookup(line + 7, 0);
 209                                 if (sym->type == S_UNKNOWN)
 210                                         sym->type = S_OTHER;
 211                         }
 212                         if (sym->flags & def_flags) {
 213                                 conf_warning("trying to reassign symbol %s", sym->name);
 214                                 break;
 215                         }
 216                         switch (sym->type) {
 217                         case S_TRISTATE:
 218                                 if (p[0] == 'm') {
 219                                         sym->def[def].tri = mod;
 220                                         sym->flags |= def_flags;
 221                                         break;
 222                                 }
 223                         case S_BOOLEAN:
 224                                 if (p[0] == 'y') {
 225                                         sym->def[def].tri = yes;
 226                                         sym->flags |= def_flags;
 227                                         break;
 228                                 }
 229                                 if (p[0] == 'n') {
 230                                         sym->def[def].tri = no;
 231                                         sym->flags |= def_flags;
 232                                         break;
 233                                 }
 234                                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 235                                 break;
 236                         case S_OTHER:
 237                                 if (*p != '"') {
 238                                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 239                                                 ;
 240                                         sym->type = S_STRING;
 241                                         goto done;
 242                                 }
 243                         case S_STRING:
 244                                 if (*p++ != '"')
 245                                         break;
 246                                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 247                                         if (*p2 == '"') {
 248                                                 *p2 = 0;
 249                                                 break;
 250                                         }
 251                                         memmove(p2, p2 + 1, strlen(p2));
 252                                 }
 253                                 if (!p2) {
 254                                         conf_warning("invalid string found");
 255                                         continue;
 256                                 }
 257                         case S_INT:
 258                         case S_HEX:
 259                         done:
 260                                 if (sym_string_valid(sym, p)) {
 261                                         sym->def[def].val = strdup(p);
 262                                         sym->flags |= def_flags;
 263                                 } else {
 264                                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 265                                         continue;
 266                                 }
 267                                 break;
 268                         default:
 269                                 ;
 270                         }
 271                         break;
 272                 case '\r':
 273                 case '\n':
 274                         break;
 275                 default:
 276                         conf_warning("unexpected data");
 277                         continue;
 278                 }
 279                 if (sym && sym_is_choice_value(sym)) {
 280                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 281                         switch (sym->def[def].tri) {
 282                         case no:
 283                                 break;
 284                         case mod:
 285                                 if (cs->def[def].tri == yes) {
 286                                         conf_warning("%s creates inconsistent choice state", sym->name);
 287                                         cs->flags &= ~def_flags;
 288                                 }
 289                                 break;
 290                         case yes:
 291                                 if (cs->def[def].tri != no) {
 292                                         conf_warning("%s creates inconsistent choice state", sym->name);
 293                                         cs->flags &= ~def_flags;
 294                                 } else
 295                                         cs->def[def].val = sym;
 296                                 break;
 297                         }
 298                         cs->def[def].tri = E_OR(cs->def[def].tri, sym->def[def].tri);
 299                 }
 300         }
 301         fclose(in);
 302
 303         if (modules_sym)
 304                 sym_calc_value(modules_sym);
 305         return 0;
 306 }
 307
 308 int conf_read(const char *name)
 309 {
 310         struct symbol *sym;
 311         struct property *prop;
 312         struct expr *e;
 313         int i, flags;
 314
 315         sym_set_change_count(0);
 316
 317         if (conf_read_simple(name, S_DEF_USER))
 318                 return 1;
 319
 320         for_all_symbols(i, sym) {
 321                 sym_calc_value(sym);
 322                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 323                         goto sym_ok;
 324                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 325                         /* check that calculated value agrees with saved value */
 326                         switch (sym->type) {
 327                         case S_BOOLEAN:
 328                         case S_TRISTATE:
 329                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 330                                         break;
 331                                 if (!sym_is_choice(sym))
 332                                         goto sym_ok;
 333                         default:
 334                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 335                                         goto sym_ok;
 336                                 break;
 337                         }
 338                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 339                         /* no previous value and not saved */
 340                         goto sym_ok;
 341                 conf_unsaved++;
 342                 /* maybe print value in verbose mode... */
 343         sym_ok:
 344                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 345                         if (sym->visible == no)
 346                                 sym->flags &= ~SYMBOL_DEF_USER;
 347                         switch (sym->type) {
 348                         case S_STRING:
 349                         case S_INT:
 350                         case S_HEX:
 351                                 if (!sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 352                                         sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 353                         default:
 354                                 break;
 355                         }
 356                 }
 357                 if (!sym_is_choice(sym))
 358                         continue;
 359                 prop = sym_get_choice_prop(sym);
 360                 flags = sym->flags;
 361                 for (e = prop->expr; e; e = e->left.expr)
 362                         if (e->right.sym->visible != no)
 363                                 flags &= e->right.sym->flags;
 364                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 365         }
 366
 367         sym_add_change_count(conf_warnings || conf_unsaved);
 368
 369         return 0;
 370 }
 371
 372 int conf_write(const char *name)
 373 {
 374         FILE *out;
 375         struct symbol *sym;
 376         struct menu *menu;
 377         const char *basename;
 378         char dirname[128], tmpname[128], newname[128];
 379         int type, l;
 380         const char *str;
 381         time_t now;
 382         int use_timestamp = 1;
 383         char *env;
 384
 385         dirname[0] = 0;
 386         if (name && name[0]) {
 387                 struct stat st;
 388                 char *slash;
 389
 390                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 391                         strcpy(dirname, name);
 392                         strcat(dirname, "/");
 393                         basename = conf_get_configname();
 394                 } else if ((slash = strrchr(name, '/'))) {
 395                         int size = slash - name + 1;
 396                         memcpy(dirname, name, size);
 397                         dirname[size] = 0;
 398                         if (slash[1])
 399                                 basename = slash + 1;
 400                         else
 401                                 basename = conf_get_configname();
 402                 } else
 403                         basename = name;
 404         } else
 405                 basename = conf_get_configname();
 406
 407         sprintf(newname, "%s%s", dirname, basename);
 408         env = getenv("KCONFIG_OVERWRITECONFIG");
 409         if (!env || !*env) {
 410                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 411                 out = fopen(tmpname, "w");
 412         } else {
 413                 *tmpname = 0;
 414                 out = fopen(newname, "w");
 415         }
 416         if (!out)
 417                 return 1;
 418
 419         sym = sym_lookup("KERNELVERSION", 0);
 420         sym_calc_value(sym);
 421         time(&now);
 422         env = getenv("KCONFIG_NOTIMESTAMP");
 423         if (env && *env)
 424                 use_timestamp = 0;
 425
 426         fprintf(out, _("#\n"
 427                        "# Automatically generated make config: don't edit\n"
 428                        "# Linux kernel version: %s\n"
 429                        "%s%s"
 430                        "#\n"),
 431                      sym_get_string_value(sym),
 432                      use_timestamp ? "# " : "",
 433                      use_timestamp ? ctime(&now) : "");
 434
 435         if (!conf_get_changed())
 436                 sym_clear_all_valid();
 437
 438         menu = rootmenu.list;
 439         while (menu) {
 440                 sym = menu->sym;
 441                 if (!sym) {
 442                         if (!menu_is_visible(menu))
 443                                 goto next;
 444                         str = menu_get_prompt(menu);
 445                         fprintf(out, "\n"
 446                                      "#\n"
 447                                      "# %s\n"
 448                                      "#\n", str);
 449                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 450                         sym_calc_value(sym);
 451                         if (!(sym->flags & SYMBOL_WRITE))
 452                                 goto next;
 453                         sym->flags &= ~SYMBOL_WRITE;
 454                         type = sym->type;
 455                         if (type == S_TRISTATE) {
 456                                 sym_calc_value(modules_sym);
 457                                 if (modules_sym->curr.tri == no)
 458                                         type = S_BOOLEAN;
 459                         }
 460                         switch (type) {
 461                         case S_BOOLEAN:
 462                         case S_TRISTATE:
 463                                 switch (sym_get_tristate_value(sym)) {
 464                                 case no:
 465                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 466                                         break;
 467                                 case mod:
 468                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 469                                         break;
 470                                 case yes:
 471                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 472                                         break;
 473                                 }
 474                                 break;
 475                         case S_STRING:
 476                                 str = sym_get_string_value(sym);
 477                                 fprintf(out, "CONFIG_%s=\"", sym->name);
 478                                 while (1) {
 479                                         l = strcspn(str, "\"\\");
 480                                         if (l) {
 481                                                 fwrite(str, l, 1, out);
 482                                                 str += l;
 483                                         }
 484                                         if (!*str)
 485                                                 break;
 486                                         fprintf(out, "\\%c", *str++);
 487                                 }
 488                                 fputs("\"\n", out);
 489                                 break;
 490                         case S_HEX:
 491                                 str = sym_get_string_value(sym);
 492                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 493                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 494                                         break;
 495                                 }
 496                         case S_INT:
 497                                 str = sym_get_string_value(sym);
 498                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 499                                 break;
 500                         }
 501                 }
 502
 503         next:
 504                 if (menu->list) {
 505                         menu = menu->list;
 506                         continue;
 507                 }
 508                 if (menu->next)
 509                         menu = menu->next;
 510                 else while ((menu = menu->parent)) {
 511                         if (menu->next) {
 512                                 menu = menu->next;
 513                                 break;
 514                         }
 515                 }
 516         }
 517         fclose(out);
 518
 519         if (*tmpname) {
 520                 strcat(dirname, basename);
 521                 strcat(dirname, ".old");
 522                 rename(newname, dirname);
 523                 if (rename(tmpname, newname))
 524                         return 1;
 525         }
 526
 527         printf(_("#\n"
 528                  "# configuration written to %s\n"
 529                  "#\n"), newname);
 530
 531         sym_set_change_count(0);
 532
 533         return 0;
 534 }
 535
 536 int conf_split_config(void)
 537 {
 538         char *name, path[128];
 539         char *s, *d, c;
 540         struct symbol *sym;
 541         struct stat sb;
 542         int res, i, fd;
 543
 544         name = getenv("KCONFIG_AUTOCONFIG");
 545         if (!name)
 546                 name = "include/config/auto.conf";
 547         conf_read_simple(name, S_DEF_AUTO);
 548
 549         if (chdir("include/config"))
 550                 return 1;
 551
 552         res = 0;
 553         for_all_symbols(i, sym) {
 554                 sym_calc_value(sym);
 555                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 556                         continue;
 557                 if (sym->flags & SYMBOL_WRITE) {
 558                         if (sym->flags & SYMBOL_DEF_AUTO) {
 559                                 /*
 560                                  * symbol has old and new value,
 561                                  * so compare them...
 562                                  */
 563                                 switch (sym->type) {
 564                                 case S_BOOLEAN:
 565                                 case S_TRISTATE:
 566                                         if (sym_get_tristate_value(sym) ==
 567                                             sym->def[S_DEF_AUTO].tri)
 568                                                 continue;
 569                                         break;
 570                                 case S_STRING:
 571                                 case S_HEX:
 572                                 case S_INT:
 573                                         if (!strcmp(sym_get_string_value(sym),
 574                                                     sym->def[S_DEF_AUTO].val))
 575                                                 continue;
 576                                         break;
 577                                 default:
 578                                         break;
 579                                 }
 580                         } else {
 581                                 /*
 582                                  * If there is no old value, only 'no' (unset)
 583                                  * is allowed as new value.
 584                                  */
 585                                 switch (sym->type) {
 586                                 case S_BOOLEAN:
 587                                 case S_TRISTATE:
 588                                         if (sym_get_tristate_value(sym) == no)
 589                                                 continue;
 590                                         break;
 591                                 default:
 592                                         break;
 593                                 }
 594                         }
 595                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 596                         /* There is neither an old nor a new value. */
 597                         continue;
 598                 /* else
 599                  *      There is an old value, but no new value ('no' (unset)
 600                  *      isn't saved in auto.conf, so the old value is always
 601                  *      different from 'no').
 602                  */
 603
 604                 /* Replace all '_' and append ".h" */
 605                 s = sym->name;
 606                 d = path;
 607                 while ((c = *s++)) {
 608                         c = tolower(c);
 609                         *d++ = (c == '_') ? '/' : c;
 610                 }
 611                 strcpy(d, ".h");
 612
 613                 /* Assume directory path already exists. */
 614                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 615                 if (fd == -1) {
 616                         if (errno != ENOENT) {
 617                                 res = 1;
 618                                 break;
 619                         }
 620                         /*
 621                          * Create directory components,
 622                          * unless they exist already.
 623                          */
 624                         d = path;
 625                         while ((d = strchr(d, '/'))) {
 626                                 *d = 0;
 627                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 628                                         res = 1;
 629                                         goto out;
 630                                 }
 631                                 *d++ = '/';
 632                         }
 633                         /* Try it again. */
 634                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 635                         if (fd == -1) {
 636                                 res = 1;
 637                                 break;
 638                         }
 639                 }
 640                 close(fd);
 641         }
 642 out:
 643         if (chdir("../.."))
 644                 return 1;
 645
 646         return res;
 647 }
 648
 649 int conf_write_autoconf(void)
 650 {
 651         struct symbol *sym;
 652         const char *str;
 653         char *name;
 654         FILE *out, *out_h;
 655         time_t now;
 656         int i, l;
 657
 658         sym_clear_all_valid();
 659
 660         file_write_dep("include/config/auto.conf.cmd");
 661
 662         if (conf_split_config())
 663                 return 1;
 664
 665         out = fopen(".tmpconfig", "w");
 666         if (!out)
 667                 return 1;
 668
 669         out_h = fopen(".tmpconfig.h", "w");
 670         if (!out_h) {
 671                 fclose(out);
 672                 return 1;
 673         }
 674
 675         sym = sym_lookup("KERNELVERSION", 0);
 676         sym_calc_value(sym);
 677         time(&now);
 678         fprintf(out, "#\n"
 679                      "# Automatically generated make config: don't edit\n"
 680                      "# Linux kernel version: %s\n"
 681                      "# %s"
 682                      "#\n",
 683                      sym_get_string_value(sym), ctime(&now));
 684         fprintf(out_h, "/*\n"
 685                        " * Automatically generated C config: don't edit\n"
 686                        " * Linux kernel version: %s\n"
 687                        " * %s"
 688                        " */\n"
 689                        "#define AUTOCONF_INCLUDED\n",
 690                        sym_get_string_value(sym), ctime(&now));
 691
 692         for_all_symbols(i, sym) {
 693                 sym_calc_value(sym);
 694                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 695                         continue;
 696                 switch (sym->type) {
 697                 case S_BOOLEAN:
 698                 case S_TRISTATE:
 699                         switch (sym_get_tristate_value(sym)) {
 700                         case no:
 701                                 break;
 702                         case mod:
 703                                 fprintf(out, "CONFIG_%s=m\n", sym->name);
 704                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 705                                 break;
 706                         case yes:
 707                                 fprintf(out, "CONFIG_%s=y\n", sym->name);
 708                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 709                                 break;
 710                         }
 711                         break;
 712                 case S_STRING:
 713                         str = sym_get_string_value(sym);
 714                         fprintf(out, "CONFIG_%s=\"", sym->name);
 715                         fprintf(out_h, "#define CONFIG_%s \"", sym->name);
 716                         while (1) {
 717                                 l = strcspn(str, "\"\\");
 718                                 if (l) {
 719                                         fwrite(str, l, 1, out);
 720                                         fwrite(str, l, 1, out_h);
 721                                         str += l;
 722                                 }
 723                                 if (!*str)
 724                                         break;
 725                                 fprintf(out, "\\%c", *str);
 726                                 fprintf(out_h, "\\%c", *str);
 727                                 str++;
 728                         }
 729                         fputs("\"\n", out);
 730                         fputs("\"\n", out_h);
 731                         break;
 732                 case S_HEX:
 733                         str = sym_get_string_value(sym);
 734                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 735                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 736                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 737                                 break;
 738                         }
 739                 case S_INT:
 740                         str = sym_get_string_value(sym);
 741                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 742                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 743                         break;
 744                 default:
 745                         break;
 746                 }
 747         }
 748         fclose(out);
 749         fclose(out_h);
 750
 751         name = getenv("KCONFIG_AUTOHEADER");
 752         if (!name)
 753                 name = "include/linux/autoconf.h";
 754         if (rename(".tmpconfig.h", name))
 755                 return 1;
 756         name = getenv("KCONFIG_AUTOCONFIG");
 757         if (!name)
 758                 name = "include/config/auto.conf";
 759         /*
 760          * This must be the last step, kbuild has a dependency on auto.conf
 761          * and this marks the successful completion of the previous steps.
 762          */
 763         if (rename(".tmpconfig", name))
 764                 return 1;
 765
 766         return 0;
 767 }
 768
 769 static int sym_change_count;
 770 static void (*conf_changed_callback)(void);
 771
 772 void sym_set_change_count(int count)
 773 {
 774         int _sym_change_count = sym_change_count;
 775         sym_change_count = count;
 776         if (conf_changed_callback &&
 777             (bool)_sym_change_count != (bool)count)
 778                 conf_changed_callback();
 779 }
 780
 781 void sym_add_change_count(int count)
 782 {
 783         sym_set_change_count(count + sym_change_count);
 784 }
 785
 786 bool conf_get_changed(void)
 787 {
 788         return sym_change_count;
 789 }
 790
 791 void conf_set_changed_callback(void (*fn)(void))
 792 {
 793         conf_changed_callback = fn;
 794 }