git.oblomov.eu Git - linux-2.6/blob - 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 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
  87 {
  88         char *p2;
  89
  90         switch (sym->type) {
  91         case S_TRISTATE:
  92                 if (p[0] == 'm') {
  93                         sym->def[def].tri = mod;
  94                         sym->flags |= def_flags;
  95                         break;
  96                 }
  97         case S_BOOLEAN:
  98                 if (p[0] == 'y') {
  99                         sym->def[def].tri = yes;
 100                         sym->flags |= def_flags;
 101                         break;
 102                 }
 103                 if (p[0] == 'n') {
 104                         sym->def[def].tri = no;
 105                         sym->flags |= def_flags;
 106                         break;
 107                 }
 108                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 109                 break;
 110         case S_OTHER:
 111                 if (*p != '"') {
 112                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 113                                 ;
 114                         sym->type = S_STRING;
 115                         goto done;
 116                 }
 117         case S_STRING:
 118                 if (*p++ != '"')
 119                         break;
 120                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 121                         if (*p2 == '"') {
 122                                 *p2 = 0;
 123                                 break;
 124                         }
 125                         memmove(p2, p2 + 1, strlen(p2));
 126                 }
 127                 if (!p2) {
 128                         conf_warning("invalid string found");
 129                         return 1;
 130                 }
 131         case S_INT:
 132         case S_HEX:
 133         done:
 134                 if (sym_string_valid(sym, p)) {
 135                         sym->def[def].val = strdup(p);
 136                         sym->flags |= def_flags;
 137                 } else {
 138                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 139                         return 1;
 140                 }
 141                 break;
 142         default:
 143                 ;
 144         }
 145         return 0;
 146 }
 147
 148 int conf_read_simple(const char *name, int def)
 149 {
 150         FILE *in = NULL;
 151         char line[1024];
 152         char *p, *p2;
 153         struct symbol *sym;
 154         int i, def_flags;
 155
 156         if (name) {
 157                 in = zconf_fopen(name);
 158         } else {
 159                 struct property *prop;
 160
 161                 name = conf_get_configname();
 162                 in = zconf_fopen(name);
 163                 if (in)
 164                         goto load;
 165                 sym_add_change_count(1);
 166                 if (!sym_defconfig_list)
 167                         return 1;
 168
 169                 for_all_defaults(sym_defconfig_list, prop) {
 170                         if (expr_calc_value(prop->visible.expr) == no ||
 171                             prop->expr->type != E_SYMBOL)
 172                                 continue;
 173                         name = conf_expand_value(prop->expr->left.sym->name);
 174                         in = zconf_fopen(name);
 175                         if (in) {
 176                                 printf(_("#\n"
 177                                          "# using defaults found in %s\n"
 178                                          "#\n"), name);
 179                                 goto load;
 180                         }
 181                 }
 182         }
 183         if (!in)
 184                 return 1;
 185
 186 load:
 187         conf_filename = name;
 188         conf_lineno = 0;
 189         conf_warnings = 0;
 190         conf_unsaved = 0;
 191
 192         def_flags = SYMBOL_DEF << def;
 193         for_all_symbols(i, sym) {
 194                 sym->flags |= SYMBOL_CHANGED;
 195                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 196                 if (sym_is_choice(sym))
 197                         sym->flags |= def_flags;
 198                 switch (sym->type) {
 199                 case S_INT:
 200                 case S_HEX:
 201                 case S_STRING:
 202                         if (sym->def[def].val)
 203                                 free(sym->def[def].val);
 204                 default:
 205                         sym->def[def].val = NULL;
 206                         sym->def[def].tri = no;
 207                 }
 208         }
 209
 210         while (fgets(line, sizeof(line), in)) {
 211                 conf_lineno++;
 212                 sym = NULL;
 213                 switch (line[0]) {
 214                 case '#':
 215                         if (memcmp(line + 2, "CONFIG_", 7))
 216                                 continue;
 217                         p = strchr(line + 9, ' ');
 218                         if (!p)
 219                                 continue;
 220                         *p++ = 0;
 221                         if (strncmp(p, "is not set", 10))
 222                                 continue;
 223                         if (def == S_DEF_USER) {
 224                                 sym = sym_find(line + 9);
 225                                 if (!sym) {
 226                                         conf_warning("trying to assign nonexistent symbol %s", line + 9);
 227                                         break;
 228                                 }
 229                         } else {
 230                                 sym = sym_lookup(line + 9, 0);
 231                                 if (sym->type == S_UNKNOWN)
 232                                         sym->type = S_BOOLEAN;
 233                         }
 234                         if (sym->flags & def_flags) {
 235                                 conf_warning("override: reassigning to symbol %s", sym->name);
 236                         }
 237                         switch (sym->type) {
 238                         case S_BOOLEAN:
 239                         case S_TRISTATE:
 240                                 sym->def[def].tri = no;
 241                                 sym->flags |= def_flags;
 242                                 break;
 243                         default:
 244                                 ;
 245                         }
 246                         break;
 247                 case 'C':
 248                         if (memcmp(line, "CONFIG_", 7)) {
 249                                 conf_warning("unexpected data");
 250                                 continue;
 251                         }
 252                         p = strchr(line + 7, '=');
 253                         if (!p)
 254                                 continue;
 255                         *p++ = 0;
 256                         p2 = strchr(p, '\n');
 257                         if (p2) {
 258                                 *p2-- = 0;
 259                                 if (*p2 == '\r')
 260                                         *p2 = 0;
 261                         }
 262                         if (def == S_DEF_USER) {
 263                                 sym = sym_find(line + 7);
 264                                 if (!sym) {
 265                                         conf_warning("trying to assign nonexistent symbol %s", line + 7);
 266                                         break;
 267                                 }
 268                         } else {
 269                                 sym = sym_lookup(line + 7, 0);
 270                                 if (sym->type == S_UNKNOWN)
 271                                         sym->type = S_OTHER;
 272                         }
 273                         if (sym->flags & def_flags) {
 274                                 conf_warning("override: reassigning to symbol %s", sym->name);
 275                         }
 276                         if (conf_set_sym_val(sym, def, def_flags, p))
 277                                 continue;
 278                         break;
 279                 case '\r':
 280                 case '\n':
 281                         break;
 282                 default:
 283                         conf_warning("unexpected data");
 284                         continue;
 285                 }
 286                 if (sym && sym_is_choice_value(sym)) {
 287                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 288                         switch (sym->def[def].tri) {
 289                         case no:
 290                                 break;
 291                         case mod:
 292                                 if (cs->def[def].tri == yes) {
 293                                         conf_warning("%s creates inconsistent choice state", sym->name);
 294                                         cs->flags &= ~def_flags;
 295                                 }
 296                                 break;
 297                         case yes:
 298                                 if (cs->def[def].tri != no)
 299                                         conf_warning("override: %s changes choice state", sym->name);
 300                                 cs->def[def].val = sym;
 301                                 break;
 302                         }
 303                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 304                 }
 305         }
 306         fclose(in);
 307
 308         if (modules_sym)
 309                 sym_calc_value(modules_sym);
 310         return 0;
 311 }
 312
 313 int conf_read(const char *name)
 314 {
 315         struct symbol *sym, *choice_sym;
 316         struct property *prop;
 317         struct expr *e;
 318         int i, flags;
 319
 320         sym_set_change_count(0);
 321
 322         if (conf_read_simple(name, S_DEF_USER))
 323                 return 1;
 324
 325         for_all_symbols(i, sym) {
 326                 sym_calc_value(sym);
 327                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 328                         goto sym_ok;
 329                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 330                         /* check that calculated value agrees with saved value */
 331                         switch (sym->type) {
 332                         case S_BOOLEAN:
 333                         case S_TRISTATE:
 334                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 335                                         break;
 336                                 if (!sym_is_choice(sym))
 337                                         goto sym_ok;
 338                         default:
 339                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 340                                         goto sym_ok;
 341                                 break;
 342                         }
 343                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 344                         /* no previous value and not saved */
 345                         goto sym_ok;
 346                 conf_unsaved++;
 347                 /* maybe print value in verbose mode... */
 348         sym_ok:
 349                 if (!sym_is_choice(sym))
 350                         continue;
 351                 /* The choice symbol only has a set value (and thus is not new)
 352                  * if all its visible childs have values.
 353                  */
 354                 prop = sym_get_choice_prop(sym);
 355                 flags = sym->flags;
 356                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 357                         if (choice_sym->visible != no)
 358                                 flags &= choice_sym->flags;
 359                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 360         }
 361
 362         for_all_symbols(i, sym) {
 363                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 364                         /* Reset values of generates values, so they'll appear
 365                          * as new, if they should become visible, but that
 366                          * doesn't quite work if the Kconfig and the saved
 367                          * configuration disagree.
 368                          */
 369                         if (sym->visible == no && !conf_unsaved)
 370                                 sym->flags &= ~SYMBOL_DEF_USER;
 371                         switch (sym->type) {
 372                         case S_STRING:
 373                         case S_INT:
 374                         case S_HEX:
 375                                 /* Reset a string value if it's out of range */
 376                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 377                                         break;
 378                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 379                                 conf_unsaved++;
 380                                 break;
 381                         default:
 382                                 break;
 383                         }
 384                 }
 385         }
 386
 387         sym_add_change_count(conf_warnings || conf_unsaved);
 388
 389         return 0;
 390 }
 391
 392 int conf_write(const char *name)
 393 {
 394         FILE *out;
 395         struct symbol *sym;
 396         struct menu *menu;
 397         const char *basename;
 398         char dirname[128], tmpname[128], newname[128];
 399         int type, l;
 400         const char *str;
 401         time_t now;
 402         int use_timestamp = 1;
 403         char *env;
 404
 405         dirname[0] = 0;
 406         if (name && name[0]) {
 407                 struct stat st;
 408                 char *slash;
 409
 410                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 411                         strcpy(dirname, name);
 412                         strcat(dirname, "/");
 413                         basename = conf_get_configname();
 414                 } else if ((slash = strrchr(name, '/'))) {
 415                         int size = slash - name + 1;
 416                         memcpy(dirname, name, size);
 417                         dirname[size] = 0;
 418                         if (slash[1])
 419                                 basename = slash + 1;
 420                         else
 421                                 basename = conf_get_configname();
 422                 } else
 423                         basename = name;
 424         } else
 425                 basename = conf_get_configname();
 426
 427         sprintf(newname, "%s%s", dirname, basename);
 428         env = getenv("KCONFIG_OVERWRITECONFIG");
 429         if (!env || !*env) {
 430                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 431                 out = fopen(tmpname, "w");
 432         } else {
 433                 *tmpname = 0;
 434                 out = fopen(newname, "w");
 435         }
 436         if (!out)
 437                 return 1;
 438
 439         sym = sym_lookup("KERNELVERSION", 0);
 440         sym_calc_value(sym);
 441         time(&now);
 442         env = getenv("KCONFIG_NOTIMESTAMP");
 443         if (env && *env)
 444                 use_timestamp = 0;
 445
 446         fprintf(out, _("#\n"
 447                        "# Automatically generated make config: don't edit\n"
 448                        "# Linux kernel version: %s\n"
 449                        "%s%s"
 450                        "#\n"),
 451                      sym_get_string_value(sym),
 452                      use_timestamp ? "# " : "",
 453                      use_timestamp ? ctime(&now) : "");
 454
 455         if (!conf_get_changed())
 456                 sym_clear_all_valid();
 457
 458         menu = rootmenu.list;
 459         while (menu) {
 460                 sym = menu->sym;
 461                 if (!sym) {
 462                         if (!menu_is_visible(menu))
 463                                 goto next;
 464                         str = menu_get_prompt(menu);
 465                         fprintf(out, "\n"
 466                                      "#\n"
 467                                      "# %s\n"
 468                                      "#\n", str);
 469                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 470                         sym_calc_value(sym);
 471                         if (!(sym->flags & SYMBOL_WRITE))
 472                                 goto next;
 473                         sym->flags &= ~SYMBOL_WRITE;
 474                         type = sym->type;
 475                         if (type == S_TRISTATE) {
 476                                 sym_calc_value(modules_sym);
 477                                 if (modules_sym->curr.tri == no)
 478                                         type = S_BOOLEAN;
 479                         }
 480                         switch (type) {
 481                         case S_BOOLEAN:
 482                         case S_TRISTATE:
 483                                 switch (sym_get_tristate_value(sym)) {
 484                                 case no:
 485                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 486                                         break;
 487                                 case mod:
 488                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 489                                         break;
 490                                 case yes:
 491                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 492                                         break;
 493                                 }
 494                                 break;
 495                         case S_STRING:
 496                                 str = sym_get_string_value(sym);
 497                                 fprintf(out, "CONFIG_%s=\"", sym->name);
 498                                 while (1) {
 499                                         l = strcspn(str, "\"\\");
 500                                         if (l) {
 501                                                 fwrite(str, l, 1, out);
 502                                                 str += l;
 503                                         }
 504                                         if (!*str)
 505                                                 break;
 506                                         fprintf(out, "\\%c", *str++);
 507                                 }
 508                                 fputs("\"\n", out);
 509                                 break;
 510                         case S_HEX:
 511                                 str = sym_get_string_value(sym);
 512                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 513                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 514                                         break;
 515                                 }
 516                         case S_INT:
 517                                 str = sym_get_string_value(sym);
 518                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 519                                 break;
 520                         }
 521                 }
 522
 523         next:
 524                 if (menu->list) {
 525                         menu = menu->list;
 526                         continue;
 527                 }
 528                 if (menu->next)
 529                         menu = menu->next;
 530                 else while ((menu = menu->parent)) {
 531                         if (menu->next) {
 532                                 menu = menu->next;
 533                                 break;
 534                         }
 535                 }
 536         }
 537         fclose(out);
 538
 539         if (*tmpname) {
 540                 strcat(dirname, basename);
 541                 strcat(dirname, ".old");
 542                 rename(newname, dirname);
 543                 if (rename(tmpname, newname))
 544                         return 1;
 545         }
 546
 547         printf(_("#\n"
 548                  "# configuration written to %s\n"
 549                  "#\n"), newname);
 550
 551         sym_set_change_count(0);
 552
 553         return 0;
 554 }
 555
 556 int conf_split_config(void)
 557 {
 558         char *name, path[128];
 559         char *s, *d, c;
 560         struct symbol *sym;
 561         struct stat sb;
 562         int res, i, fd;
 563
 564         name = getenv("KCONFIG_AUTOCONFIG");
 565         if (!name)
 566                 name = "include/config/auto.conf";
 567         conf_read_simple(name, S_DEF_AUTO);
 568
 569         if (chdir("include/config"))
 570                 return 1;
 571
 572         res = 0;
 573         for_all_symbols(i, sym) {
 574                 sym_calc_value(sym);
 575                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 576                         continue;
 577                 if (sym->flags & SYMBOL_WRITE) {
 578                         if (sym->flags & SYMBOL_DEF_AUTO) {
 579                                 /*
 580                                  * symbol has old and new value,
 581                                  * so compare them...
 582                                  */
 583                                 switch (sym->type) {
 584                                 case S_BOOLEAN:
 585                                 case S_TRISTATE:
 586                                         if (sym_get_tristate_value(sym) ==
 587                                             sym->def[S_DEF_AUTO].tri)
 588                                                 continue;
 589                                         break;
 590                                 case S_STRING:
 591                                 case S_HEX:
 592                                 case S_INT:
 593                                         if (!strcmp(sym_get_string_value(sym),
 594                                                     sym->def[S_DEF_AUTO].val))
 595                                                 continue;
 596                                         break;
 597                                 default:
 598                                         break;
 599                                 }
 600                         } else {
 601                                 /*
 602                                  * If there is no old value, only 'no' (unset)
 603                                  * is allowed as new value.
 604                                  */
 605                                 switch (sym->type) {
 606                                 case S_BOOLEAN:
 607                                 case S_TRISTATE:
 608                                         if (sym_get_tristate_value(sym) == no)
 609                                                 continue;
 610                                         break;
 611                                 default:
 612                                         break;
 613                                 }
 614                         }
 615                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 616                         /* There is neither an old nor a new value. */
 617                         continue;
 618                 /* else
 619                  *      There is an old value, but no new value ('no' (unset)
 620                  *      isn't saved in auto.conf, so the old value is always
 621                  *      different from 'no').
 622                  */
 623
 624                 /* Replace all '_' and append ".h" */
 625                 s = sym->name;
 626                 d = path;
 627                 while ((c = *s++)) {
 628                         c = tolower(c);
 629                         *d++ = (c == '_') ? '/' : c;
 630                 }
 631                 strcpy(d, ".h");
 632
 633                 /* Assume directory path already exists. */
 634                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 635                 if (fd == -1) {
 636                         if (errno != ENOENT) {
 637                                 res = 1;
 638                                 break;
 639                         }
 640                         /*
 641                          * Create directory components,
 642                          * unless they exist already.
 643                          */
 644                         d = path;
 645                         while ((d = strchr(d, '/'))) {
 646                                 *d = 0;
 647                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 648                                         res = 1;
 649                                         goto out;
 650                                 }
 651                                 *d++ = '/';
 652                         }
 653                         /* Try it again. */
 654                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 655                         if (fd == -1) {
 656                                 res = 1;
 657                                 break;
 658                         }
 659                 }
 660                 close(fd);
 661         }
 662 out:
 663         if (chdir("../.."))
 664                 return 1;
 665
 666         return res;
 667 }
 668
 669 int conf_write_autoconf(void)
 670 {
 671         struct symbol *sym;
 672         const char *str;
 673         char *name;
 674         FILE *out, *out_h;
 675         time_t now;
 676         int i, l;
 677
 678         sym_clear_all_valid();
 679
 680         file_write_dep("include/config/auto.conf.cmd");
 681
 682         if (conf_split_config())
 683                 return 1;
 684
 685         out = fopen(".tmpconfig", "w");
 686         if (!out)
 687                 return 1;
 688
 689         out_h = fopen(".tmpconfig.h", "w");
 690         if (!out_h) {
 691                 fclose(out);
 692                 return 1;
 693         }
 694
 695         sym = sym_lookup("KERNELVERSION", 0);
 696         sym_calc_value(sym);
 697         time(&now);
 698         fprintf(out, "#\n"
 699                      "# Automatically generated make config: don't edit\n"
 700                      "# Linux kernel version: %s\n"
 701                      "# %s"
 702                      "#\n",
 703                      sym_get_string_value(sym), ctime(&now));
 704         fprintf(out_h, "/*\n"
 705                        " * Automatically generated C config: don't edit\n"
 706                        " * Linux kernel version: %s\n"
 707                        " * %s"
 708                        " */\n"
 709                        "#define AUTOCONF_INCLUDED\n",
 710                        sym_get_string_value(sym), ctime(&now));
 711
 712         for_all_symbols(i, sym) {
 713                 sym_calc_value(sym);
 714                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 715                         continue;
 716                 switch (sym->type) {
 717                 case S_BOOLEAN:
 718                 case S_TRISTATE:
 719                         switch (sym_get_tristate_value(sym)) {
 720                         case no:
 721                                 break;
 722                         case mod:
 723                                 fprintf(out, "CONFIG_%s=m\n", sym->name);
 724                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 725                                 break;
 726                         case yes:
 727                                 fprintf(out, "CONFIG_%s=y\n", sym->name);
 728                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 729                                 break;
 730                         }
 731                         break;
 732                 case S_STRING:
 733                         str = sym_get_string_value(sym);
 734                         fprintf(out, "CONFIG_%s=\"", sym->name);
 735                         fprintf(out_h, "#define CONFIG_%s \"", sym->name);
 736                         while (1) {
 737                                 l = strcspn(str, "\"\\");
 738                                 if (l) {
 739                                         fwrite(str, l, 1, out);
 740                                         fwrite(str, l, 1, out_h);
 741                                         str += l;
 742                                 }
 743                                 if (!*str)
 744                                         break;
 745                                 fprintf(out, "\\%c", *str);
 746                                 fprintf(out_h, "\\%c", *str);
 747                                 str++;
 748                         }
 749                         fputs("\"\n", out);
 750                         fputs("\"\n", out_h);
 751                         break;
 752                 case S_HEX:
 753                         str = sym_get_string_value(sym);
 754                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 755                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 756                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 757                                 break;
 758                         }
 759                 case S_INT:
 760                         str = sym_get_string_value(sym);
 761                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 762                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 763                         break;
 764                 default:
 765                         break;
 766                 }
 767         }
 768         fclose(out);
 769         fclose(out_h);
 770
 771         name = getenv("KCONFIG_AUTOHEADER");
 772         if (!name)
 773                 name = "include/linux/autoconf.h";
 774         if (rename(".tmpconfig.h", name))
 775                 return 1;
 776         name = getenv("KCONFIG_AUTOCONFIG");
 777         if (!name)
 778                 name = "include/config/auto.conf";
 779         /*
 780          * This must be the last step, kbuild has a dependency on auto.conf
 781          * and this marks the successful completion of the previous steps.
 782          */
 783         if (rename(".tmpconfig", name))
 784                 return 1;
 785
 786         return 0;
 787 }
 788
 789 static int sym_change_count;
 790 static void (*conf_changed_callback)(void);
 791
 792 void sym_set_change_count(int count)
 793 {
 794         int _sym_change_count = sym_change_count;
 795         sym_change_count = count;
 796         if (conf_changed_callback &&
 797             (bool)_sym_change_count != (bool)count)
 798                 conf_changed_callback();
 799 }
 800
 801 void sym_add_change_count(int count)
 802 {
 803         sym_set_change_count(count + sym_change_count);
 804 }
 805
 806 bool conf_get_changed(void)
 807 {
 808         return sym_change_count;
 809 }
 810
 811 void conf_set_changed_callback(void (*fn)(void))
 812 {
 813         conf_changed_callback = fn;
 814 }