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_is_choice(sym))
 345                         continue;
 346                 /* The choice symbol only has a set value (and thus is not new)
 347                  * if all its visible childs have values.
 348                  */
 349                 prop = sym_get_choice_prop(sym);
 350                 flags = sym->flags;
 351                 for (e = prop->expr; e; e = e->left.expr)
 352                         if (e->right.sym->visible != no)
 353                                 flags &= e->right.sym->flags;
 354                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 355         }
 356
 357         for_all_symbols(i, sym) {
 358                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 359                         /* Reset values of generates values, so they'll appear
 360                          * as new, if they should become visible, but that
 361                          * doesn't quite work if the Kconfig and the saved
 362                          * configuration disagree.
 363                          */
 364                         if (sym->visible == no && !conf_unsaved)
 365                                 sym->flags &= ~SYMBOL_DEF_USER;
 366                         switch (sym->type) {
 367                         case S_STRING:
 368                         case S_INT:
 369                         case S_HEX:
 370                                 /* Reset a string value if it's out of range */
 371                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 372                                         break;
 373                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 374                                 conf_unsaved++;
 375                                 break;
 376                         default:
 377                                 break;
 378                         }
 379                 }
 380         }
 381
 382         sym_add_change_count(conf_warnings || conf_unsaved);
 383
 384         return 0;
 385 }
 386
 387 int conf_write(const char *name)
 388 {
 389         FILE *out;
 390         struct symbol *sym;
 391         struct menu *menu;
 392         const char *basename;
 393         char dirname[128], tmpname[128], newname[128];
 394         int type, l;
 395         const char *str;
 396         time_t now;
 397         int use_timestamp = 1;
 398         char *env;
 399
 400         dirname[0] = 0;
 401         if (name && name[0]) {
 402                 struct stat st;
 403                 char *slash;
 404
 405                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 406                         strcpy(dirname, name);
 407                         strcat(dirname, "/");
 408                         basename = conf_get_configname();
 409                 } else if ((slash = strrchr(name, '/'))) {
 410                         int size = slash - name + 1;
 411                         memcpy(dirname, name, size);
 412                         dirname[size] = 0;
 413                         if (slash[1])
 414                                 basename = slash + 1;
 415                         else
 416                                 basename = conf_get_configname();
 417                 } else
 418                         basename = name;
 419         } else
 420                 basename = conf_get_configname();
 421
 422         sprintf(newname, "%s%s", dirname, basename);
 423         env = getenv("KCONFIG_OVERWRITECONFIG");
 424         if (!env || !*env) {
 425                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 426                 out = fopen(tmpname, "w");
 427         } else {
 428                 *tmpname = 0;
 429                 out = fopen(newname, "w");
 430         }
 431         if (!out)
 432                 return 1;
 433
 434         sym = sym_lookup("KERNELVERSION", 0);
 435         sym_calc_value(sym);
 436         time(&now);
 437         env = getenv("KCONFIG_NOTIMESTAMP");
 438         if (env && *env)
 439                 use_timestamp = 0;
 440
 441         fprintf(out, _("#\n"
 442                        "# Automatically generated make config: don't edit\n"
 443                        "# Linux kernel version: %s\n"
 444                        "%s%s"
 445                        "#\n"),
 446                      sym_get_string_value(sym),
 447                      use_timestamp ? "# " : "",
 448                      use_timestamp ? ctime(&now) : "");
 449
 450         if (!conf_get_changed())
 451                 sym_clear_all_valid();
 452
 453         menu = rootmenu.list;
 454         while (menu) {
 455                 sym = menu->sym;
 456                 if (!sym) {
 457                         if (!menu_is_visible(menu))
 458                                 goto next;
 459                         str = menu_get_prompt(menu);
 460                         fprintf(out, "\n"
 461                                      "#\n"
 462                                      "# %s\n"
 463                                      "#\n", str);
 464                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 465                         sym_calc_value(sym);
 466                         if (!(sym->flags & SYMBOL_WRITE))
 467                                 goto next;
 468                         sym->flags &= ~SYMBOL_WRITE;
 469                         type = sym->type;
 470                         if (type == S_TRISTATE) {
 471                                 sym_calc_value(modules_sym);
 472                                 if (modules_sym->curr.tri == no)
 473                                         type = S_BOOLEAN;
 474                         }
 475                         switch (type) {
 476                         case S_BOOLEAN:
 477                         case S_TRISTATE:
 478                                 switch (sym_get_tristate_value(sym)) {
 479                                 case no:
 480                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 481                                         break;
 482                                 case mod:
 483                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 484                                         break;
 485                                 case yes:
 486                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 487                                         break;
 488                                 }
 489                                 break;
 490                         case S_STRING:
 491                                 str = sym_get_string_value(sym);
 492                                 fprintf(out, "CONFIG_%s=\"", sym->name);
 493                                 while (1) {
 494                                         l = strcspn(str, "\"\\");
 495                                         if (l) {
 496                                                 fwrite(str, l, 1, out);
 497                                                 str += l;
 498                                         }
 499                                         if (!*str)
 500                                                 break;
 501                                         fprintf(out, "\\%c", *str++);
 502                                 }
 503                                 fputs("\"\n", out);
 504                                 break;
 505                         case S_HEX:
 506                                 str = sym_get_string_value(sym);
 507                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 508                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 509                                         break;
 510                                 }
 511                         case S_INT:
 512                                 str = sym_get_string_value(sym);
 513                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 514                                 break;
 515                         }
 516                 }
 517
 518         next:
 519                 if (menu->list) {
 520                         menu = menu->list;
 521                         continue;
 522                 }
 523                 if (menu->next)
 524                         menu = menu->next;
 525                 else while ((menu = menu->parent)) {
 526                         if (menu->next) {
 527                                 menu = menu->next;
 528                                 break;
 529                         }
 530                 }
 531         }
 532         fclose(out);
 533
 534         if (*tmpname) {
 535                 strcat(dirname, basename);
 536                 strcat(dirname, ".old");
 537                 rename(newname, dirname);
 538                 if (rename(tmpname, newname))
 539                         return 1;
 540         }
 541
 542         printf(_("#\n"
 543                  "# configuration written to %s\n"
 544                  "#\n"), newname);
 545
 546         sym_set_change_count(0);
 547
 548         return 0;
 549 }
 550
 551 int conf_split_config(void)
 552 {
 553         char *name, path[128];
 554         char *s, *d, c;
 555         struct symbol *sym;
 556         struct stat sb;
 557         int res, i, fd;
 558
 559         name = getenv("KCONFIG_AUTOCONFIG");
 560         if (!name)
 561                 name = "include/config/auto.conf";
 562         conf_read_simple(name, S_DEF_AUTO);
 563
 564         if (chdir("include/config"))
 565                 return 1;
 566
 567         res = 0;
 568         for_all_symbols(i, sym) {
 569                 sym_calc_value(sym);
 570                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 571                         continue;
 572                 if (sym->flags & SYMBOL_WRITE) {
 573                         if (sym->flags & SYMBOL_DEF_AUTO) {
 574                                 /*
 575                                  * symbol has old and new value,
 576                                  * so compare them...
 577                                  */
 578                                 switch (sym->type) {
 579                                 case S_BOOLEAN:
 580                                 case S_TRISTATE:
 581                                         if (sym_get_tristate_value(sym) ==
 582                                             sym->def[S_DEF_AUTO].tri)
 583                                                 continue;
 584                                         break;
 585                                 case S_STRING:
 586                                 case S_HEX:
 587                                 case S_INT:
 588                                         if (!strcmp(sym_get_string_value(sym),
 589                                                     sym->def[S_DEF_AUTO].val))
 590                                                 continue;
 591                                         break;
 592                                 default:
 593                                         break;
 594                                 }
 595                         } else {
 596                                 /*
 597                                  * If there is no old value, only 'no' (unset)
 598                                  * is allowed as new value.
 599                                  */
 600                                 switch (sym->type) {
 601                                 case S_BOOLEAN:
 602                                 case S_TRISTATE:
 603                                         if (sym_get_tristate_value(sym) == no)
 604                                                 continue;
 605                                         break;
 606                                 default:
 607                                         break;
 608                                 }
 609                         }
 610                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 611                         /* There is neither an old nor a new value. */
 612                         continue;
 613                 /* else
 614                  *      There is an old value, but no new value ('no' (unset)
 615                  *      isn't saved in auto.conf, so the old value is always
 616                  *      different from 'no').
 617                  */
 618
 619                 /* Replace all '_' and append ".h" */
 620                 s = sym->name;
 621                 d = path;
 622                 while ((c = *s++)) {
 623                         c = tolower(c);
 624                         *d++ = (c == '_') ? '/' : c;
 625                 }
 626                 strcpy(d, ".h");
 627
 628                 /* Assume directory path already exists. */
 629                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 630                 if (fd == -1) {
 631                         if (errno != ENOENT) {
 632                                 res = 1;
 633                                 break;
 634                         }
 635                         /*
 636                          * Create directory components,
 637                          * unless they exist already.
 638                          */
 639                         d = path;
 640                         while ((d = strchr(d, '/'))) {
 641                                 *d = 0;
 642                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 643                                         res = 1;
 644                                         goto out;
 645                                 }
 646                                 *d++ = '/';
 647                         }
 648                         /* Try it again. */
 649                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 650                         if (fd == -1) {
 651                                 res = 1;
 652                                 break;
 653                         }
 654                 }
 655                 close(fd);
 656         }
 657 out:
 658         if (chdir("../.."))
 659                 return 1;
 660
 661         return res;
 662 }
 663
 664 int conf_write_autoconf(void)
 665 {
 666         struct symbol *sym;
 667         const char *str;
 668         char *name;
 669         FILE *out, *out_h;
 670         time_t now;
 671         int i, l;
 672
 673         sym_clear_all_valid();
 674
 675         file_write_dep("include/config/auto.conf.cmd");
 676
 677         if (conf_split_config())
 678                 return 1;
 679
 680         out = fopen(".tmpconfig", "w");
 681         if (!out)
 682                 return 1;
 683
 684         out_h = fopen(".tmpconfig.h", "w");
 685         if (!out_h) {
 686                 fclose(out);
 687                 return 1;
 688         }
 689
 690         sym = sym_lookup("KERNELVERSION", 0);
 691         sym_calc_value(sym);
 692         time(&now);
 693         fprintf(out, "#\n"
 694                      "# Automatically generated make config: don't edit\n"
 695                      "# Linux kernel version: %s\n"
 696                      "# %s"
 697                      "#\n",
 698                      sym_get_string_value(sym), ctime(&now));
 699         fprintf(out_h, "/*\n"
 700                        " * Automatically generated C config: don't edit\n"
 701                        " * Linux kernel version: %s\n"
 702                        " * %s"
 703                        " */\n"
 704                        "#define AUTOCONF_INCLUDED\n",
 705                        sym_get_string_value(sym), ctime(&now));
 706
 707         for_all_symbols(i, sym) {
 708                 sym_calc_value(sym);
 709                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 710                         continue;
 711                 switch (sym->type) {
 712                 case S_BOOLEAN:
 713                 case S_TRISTATE:
 714                         switch (sym_get_tristate_value(sym)) {
 715                         case no:
 716                                 break;
 717                         case mod:
 718                                 fprintf(out, "CONFIG_%s=m\n", sym->name);
 719                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 720                                 break;
 721                         case yes:
 722                                 fprintf(out, "CONFIG_%s=y\n", sym->name);
 723                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 724                                 break;
 725                         }
 726                         break;
 727                 case S_STRING:
 728                         str = sym_get_string_value(sym);
 729                         fprintf(out, "CONFIG_%s=\"", sym->name);
 730                         fprintf(out_h, "#define CONFIG_%s \"", sym->name);
 731                         while (1) {
 732                                 l = strcspn(str, "\"\\");
 733                                 if (l) {
 734                                         fwrite(str, l, 1, out);
 735                                         fwrite(str, l, 1, out_h);
 736                                         str += l;
 737                                 }
 738                                 if (!*str)
 739                                         break;
 740                                 fprintf(out, "\\%c", *str);
 741                                 fprintf(out_h, "\\%c", *str);
 742                                 str++;
 743                         }
 744                         fputs("\"\n", out);
 745                         fputs("\"\n", out_h);
 746                         break;
 747                 case S_HEX:
 748                         str = sym_get_string_value(sym);
 749                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 750                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 751                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 752                                 break;
 753                         }
 754                 case S_INT:
 755                         str = sym_get_string_value(sym);
 756                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 757                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 758                         break;
 759                 default:
 760                         break;
 761                 }
 762         }
 763         fclose(out);
 764         fclose(out_h);
 765
 766         name = getenv("KCONFIG_AUTOHEADER");
 767         if (!name)
 768                 name = "include/linux/autoconf.h";
 769         if (rename(".tmpconfig.h", name))
 770                 return 1;
 771         name = getenv("KCONFIG_AUTOCONFIG");
 772         if (!name)
 773                 name = "include/config/auto.conf";
 774         /*
 775          * This must be the last step, kbuild has a dependency on auto.conf
 776          * and this marks the successful completion of the previous steps.
 777          */
 778         if (rename(".tmpconfig", name))
 779                 return 1;
 780
 781         return 0;
 782 }
 783
 784 static int sym_change_count;
 785 static void (*conf_changed_callback)(void);
 786
 787 void sym_set_change_count(int count)
 788 {
 789         int _sym_change_count = sym_change_count;
 790         sym_change_count = count;
 791         if (conf_changed_callback &&
 792             (bool)_sym_change_count != (bool)count)
 793                 conf_changed_callback();
 794 }
 795
 796 void sym_add_change_count(int count)
 797 {
 798         sym_set_change_count(count + sym_change_count);
 799 }
 800
 801 bool conf_get_changed(void)
 802 {
 803         return sym_change_count;
 804 }
 805
 806 void conf_set_changed_callback(void (*fn)(void))
 807 {
 808         conf_changed_callback = fn;
 809 }