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("trying to reassign symbol %s", sym->name);
 236                                 break;
 237                         }
 238                         switch (sym->type) {
 239                         case S_BOOLEAN:
 240                         case S_TRISTATE:
 241                                 sym->def[def].tri = no;
 242                                 sym->flags |= def_flags;
 243                                 break;
 244                         default:
 245                                 ;
 246                         }
 247                         break;
 248                 case 'C':
 249                         if (memcmp(line, "CONFIG_", 7)) {
 250                                 conf_warning("unexpected data");
 251                                 continue;
 252                         }
 253                         p = strchr(line + 7, '=');
 254                         if (!p)
 255                                 continue;
 256                         *p++ = 0;
 257                         p2 = strchr(p, '\n');
 258                         if (p2) {
 259                                 *p2-- = 0;
 260                                 if (*p2 == '\r')
 261                                         *p2 = 0;
 262                         }
 263                         if (def == S_DEF_USER) {
 264                                 sym = sym_find(line + 7);
 265                                 if (!sym) {
 266                                         conf_warning("trying to assign nonexistent symbol %s", line + 7);
 267                                         break;
 268                                 }
 269                         } else {
 270                                 sym = sym_lookup(line + 7, 0);
 271                                 if (sym->type == S_UNKNOWN)
 272                                         sym->type = S_OTHER;
 273                         }
 274                         if (sym->flags & def_flags) {
 275                                 conf_warning("trying to reassign symbol %s", sym->name);
 276                                 break;
 277                         }
 278                         if (conf_set_sym_val(sym, def, def_flags, p))
 279                                 continue;
 280                         break;
 281                 case '\r':
 282                 case '\n':
 283                         break;
 284                 default:
 285                         conf_warning("unexpected data");
 286                         continue;
 287                 }
 288                 if (sym && sym_is_choice_value(sym)) {
 289                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 290                         switch (sym->def[def].tri) {
 291                         case no:
 292                                 break;
 293                         case mod:
 294                                 if (cs->def[def].tri == yes) {
 295                                         conf_warning("%s creates inconsistent choice state", sym->name);
 296                                         cs->flags &= ~def_flags;
 297                                 }
 298                                 break;
 299                         case yes:
 300                                 if (cs->def[def].tri != no) {
 301                                         conf_warning("%s creates inconsistent choice state", sym->name);
 302                                         cs->flags &= ~def_flags;
 303                                 } else
 304                                         cs->def[def].val = sym;
 305                                 break;
 306                         }
 307                         cs->def[def].tri = E_OR(cs->def[def].tri, sym->def[def].tri);
 308                 }
 309         }
 310         fclose(in);
 311
 312         if (modules_sym)
 313                 sym_calc_value(modules_sym);
 314         return 0;
 315 }
 316
 317 int conf_read(const char *name)
 318 {
 319         struct symbol *sym;
 320         struct property *prop;
 321         struct expr *e;
 322         int i, flags;
 323
 324         sym_set_change_count(0);
 325
 326         if (conf_read_simple(name, S_DEF_USER))
 327                 return 1;
 328
 329         for_all_symbols(i, sym) {
 330                 sym_calc_value(sym);
 331                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 332                         goto sym_ok;
 333                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 334                         /* check that calculated value agrees with saved value */
 335                         switch (sym->type) {
 336                         case S_BOOLEAN:
 337                         case S_TRISTATE:
 338                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 339                                         break;
 340                                 if (!sym_is_choice(sym))
 341                                         goto sym_ok;
 342                         default:
 343                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 344                                         goto sym_ok;
 345                                 break;
 346                         }
 347                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 348                         /* no previous value and not saved */
 349                         goto sym_ok;
 350                 conf_unsaved++;
 351                 /* maybe print value in verbose mode... */
 352         sym_ok:
 353                 if (!sym_is_choice(sym))
 354                         continue;
 355                 /* The choice symbol only has a set value (and thus is not new)
 356                  * if all its visible childs have values.
 357                  */
 358                 prop = sym_get_choice_prop(sym);
 359                 flags = sym->flags;
 360                 for (e = prop->expr; e; e = e->left.expr)
 361                         if (e->right.sym->visible != no)
 362                                 flags &= e->right.sym->flags;
 363                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 364         }
 365
 366         for_all_symbols(i, sym) {
 367                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 368                         /* Reset values of generates values, so they'll appear
 369                          * as new, if they should become visible, but that
 370                          * doesn't quite work if the Kconfig and the saved
 371                          * configuration disagree.
 372                          */
 373                         if (sym->visible == no && !conf_unsaved)
 374                                 sym->flags &= ~SYMBOL_DEF_USER;
 375                         switch (sym->type) {
 376                         case S_STRING:
 377                         case S_INT:
 378                         case S_HEX:
 379                                 /* Reset a string value if it's out of range */
 380                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 381                                         break;
 382                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 383                                 conf_unsaved++;
 384                                 break;
 385                         default:
 386                                 break;
 387                         }
 388                 }
 389         }
 390
 391         sym_add_change_count(conf_warnings || conf_unsaved);
 392
 393         return 0;
 394 }
 395
 396 int conf_write(const char *name)
 397 {
 398         FILE *out;
 399         struct symbol *sym;
 400         struct menu *menu;
 401         const char *basename;
 402         char dirname[128], tmpname[128], newname[128];
 403         int type, l;
 404         const char *str;
 405         time_t now;
 406         int use_timestamp = 1;
 407         char *env;
 408
 409         dirname[0] = 0;
 410         if (name && name[0]) {
 411                 struct stat st;
 412                 char *slash;
 413
 414                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 415                         strcpy(dirname, name);
 416                         strcat(dirname, "/");
 417                         basename = conf_get_configname();
 418                 } else if ((slash = strrchr(name, '/'))) {
 419                         int size = slash - name + 1;
 420                         memcpy(dirname, name, size);
 421                         dirname[size] = 0;
 422                         if (slash[1])
 423                                 basename = slash + 1;
 424                         else
 425                                 basename = conf_get_configname();
 426                 } else
 427                         basename = name;
 428         } else
 429                 basename = conf_get_configname();
 430
 431         sprintf(newname, "%s%s", dirname, basename);
 432         env = getenv("KCONFIG_OVERWRITECONFIG");
 433         if (!env || !*env) {
 434                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 435                 out = fopen(tmpname, "w");
 436         } else {
 437                 *tmpname = 0;
 438                 out = fopen(newname, "w");
 439         }
 440         if (!out)
 441                 return 1;
 442
 443         sym = sym_lookup("KERNELVERSION", 0);
 444         sym_calc_value(sym);
 445         time(&now);
 446         env = getenv("KCONFIG_NOTIMESTAMP");
 447         if (env && *env)
 448                 use_timestamp = 0;
 449
 450         fprintf(out, _("#\n"
 451                        "# Automatically generated make config: don't edit\n"
 452                        "# Linux kernel version: %s\n"
 453                        "%s%s"
 454                        "#\n"),
 455                      sym_get_string_value(sym),
 456                      use_timestamp ? "# " : "",
 457                      use_timestamp ? ctime(&now) : "");
 458
 459         if (!conf_get_changed())
 460                 sym_clear_all_valid();
 461
 462         menu = rootmenu.list;
 463         while (menu) {
 464                 sym = menu->sym;
 465                 if (!sym) {
 466                         if (!menu_is_visible(menu))
 467                                 goto next;
 468                         str = menu_get_prompt(menu);
 469                         fprintf(out, "\n"
 470                                      "#\n"
 471                                      "# %s\n"
 472                                      "#\n", str);
 473                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 474                         sym_calc_value(sym);
 475                         if (!(sym->flags & SYMBOL_WRITE))
 476                                 goto next;
 477                         sym->flags &= ~SYMBOL_WRITE;
 478                         type = sym->type;
 479                         if (type == S_TRISTATE) {
 480                                 sym_calc_value(modules_sym);
 481                                 if (modules_sym->curr.tri == no)
 482                                         type = S_BOOLEAN;
 483                         }
 484                         switch (type) {
 485                         case S_BOOLEAN:
 486                         case S_TRISTATE:
 487                                 switch (sym_get_tristate_value(sym)) {
 488                                 case no:
 489                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 490                                         break;
 491                                 case mod:
 492                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 493                                         break;
 494                                 case yes:
 495                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 496                                         break;
 497                                 }
 498                                 break;
 499                         case S_STRING:
 500                                 str = sym_get_string_value(sym);
 501                                 fprintf(out, "CONFIG_%s=\"", sym->name);
 502                                 while (1) {
 503                                         l = strcspn(str, "\"\\");
 504                                         if (l) {
 505                                                 fwrite(str, l, 1, out);
 506                                                 str += l;
 507                                         }
 508                                         if (!*str)
 509                                                 break;
 510                                         fprintf(out, "\\%c", *str++);
 511                                 }
 512                                 fputs("\"\n", out);
 513                                 break;
 514                         case S_HEX:
 515                                 str = sym_get_string_value(sym);
 516                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 517                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 518                                         break;
 519                                 }
 520                         case S_INT:
 521                                 str = sym_get_string_value(sym);
 522                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 523                                 break;
 524                         }
 525                 }
 526
 527         next:
 528                 if (menu->list) {
 529                         menu = menu->list;
 530                         continue;
 531                 }
 532                 if (menu->next)
 533                         menu = menu->next;
 534                 else while ((menu = menu->parent)) {
 535                         if (menu->next) {
 536                                 menu = menu->next;
 537                                 break;
 538                         }
 539                 }
 540         }
 541         fclose(out);
 542
 543         if (*tmpname) {
 544                 strcat(dirname, basename);
 545                 strcat(dirname, ".old");
 546                 rename(newname, dirname);
 547                 if (rename(tmpname, newname))
 548                         return 1;
 549         }
 550
 551         printf(_("#\n"
 552                  "# configuration written to %s\n"
 553                  "#\n"), newname);
 554
 555         sym_set_change_count(0);
 556
 557         return 0;
 558 }
 559
 560 int conf_split_config(void)
 561 {
 562         char *name, path[128];
 563         char *s, *d, c;
 564         struct symbol *sym;
 565         struct stat sb;
 566         int res, i, fd;
 567
 568         name = getenv("KCONFIG_AUTOCONFIG");
 569         if (!name)
 570                 name = "include/config/auto.conf";
 571         conf_read_simple(name, S_DEF_AUTO);
 572
 573         if (chdir("include/config"))
 574                 return 1;
 575
 576         res = 0;
 577         for_all_symbols(i, sym) {
 578                 sym_calc_value(sym);
 579                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 580                         continue;
 581                 if (sym->flags & SYMBOL_WRITE) {
 582                         if (sym->flags & SYMBOL_DEF_AUTO) {
 583                                 /*
 584                                  * symbol has old and new value,
 585                                  * so compare them...
 586                                  */
 587                                 switch (sym->type) {
 588                                 case S_BOOLEAN:
 589                                 case S_TRISTATE:
 590                                         if (sym_get_tristate_value(sym) ==
 591                                             sym->def[S_DEF_AUTO].tri)
 592                                                 continue;
 593                                         break;
 594                                 case S_STRING:
 595                                 case S_HEX:
 596                                 case S_INT:
 597                                         if (!strcmp(sym_get_string_value(sym),
 598                                                     sym->def[S_DEF_AUTO].val))
 599                                                 continue;
 600                                         break;
 601                                 default:
 602                                         break;
 603                                 }
 604                         } else {
 605                                 /*
 606                                  * If there is no old value, only 'no' (unset)
 607                                  * is allowed as new value.
 608                                  */
 609                                 switch (sym->type) {
 610                                 case S_BOOLEAN:
 611                                 case S_TRISTATE:
 612                                         if (sym_get_tristate_value(sym) == no)
 613                                                 continue;
 614                                         break;
 615                                 default:
 616                                         break;
 617                                 }
 618                         }
 619                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 620                         /* There is neither an old nor a new value. */
 621                         continue;
 622                 /* else
 623                  *      There is an old value, but no new value ('no' (unset)
 624                  *      isn't saved in auto.conf, so the old value is always
 625                  *      different from 'no').
 626                  */
 627
 628                 /* Replace all '_' and append ".h" */
 629                 s = sym->name;
 630                 d = path;
 631                 while ((c = *s++)) {
 632                         c = tolower(c);
 633                         *d++ = (c == '_') ? '/' : c;
 634                 }
 635                 strcpy(d, ".h");
 636
 637                 /* Assume directory path already exists. */
 638                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 639                 if (fd == -1) {
 640                         if (errno != ENOENT) {
 641                                 res = 1;
 642                                 break;
 643                         }
 644                         /*
 645                          * Create directory components,
 646                          * unless they exist already.
 647                          */
 648                         d = path;
 649                         while ((d = strchr(d, '/'))) {
 650                                 *d = 0;
 651                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 652                                         res = 1;
 653                                         goto out;
 654                                 }
 655                                 *d++ = '/';
 656                         }
 657                         /* Try it again. */
 658                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 659                         if (fd == -1) {
 660                                 res = 1;
 661                                 break;
 662                         }
 663                 }
 664                 close(fd);
 665         }
 666 out:
 667         if (chdir("../.."))
 668                 return 1;
 669
 670         return res;
 671 }
 672
 673 int conf_write_autoconf(void)
 674 {
 675         struct symbol *sym;
 676         const char *str;
 677         char *name;
 678         FILE *out, *out_h;
 679         time_t now;
 680         int i, l;
 681
 682         sym_clear_all_valid();
 683
 684         file_write_dep("include/config/auto.conf.cmd");
 685
 686         if (conf_split_config())
 687                 return 1;
 688
 689         out = fopen(".tmpconfig", "w");
 690         if (!out)
 691                 return 1;
 692
 693         out_h = fopen(".tmpconfig.h", "w");
 694         if (!out_h) {
 695                 fclose(out);
 696                 return 1;
 697         }
 698
 699         sym = sym_lookup("KERNELVERSION", 0);
 700         sym_calc_value(sym);
 701         time(&now);
 702         fprintf(out, "#\n"
 703                      "# Automatically generated make config: don't edit\n"
 704                      "# Linux kernel version: %s\n"
 705                      "# %s"
 706                      "#\n",
 707                      sym_get_string_value(sym), ctime(&now));
 708         fprintf(out_h, "/*\n"
 709                        " * Automatically generated C config: don't edit\n"
 710                        " * Linux kernel version: %s\n"
 711                        " * %s"
 712                        " */\n"
 713                        "#define AUTOCONF_INCLUDED\n",
 714                        sym_get_string_value(sym), ctime(&now));
 715
 716         for_all_symbols(i, sym) {
 717                 sym_calc_value(sym);
 718                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 719                         continue;
 720                 switch (sym->type) {
 721                 case S_BOOLEAN:
 722                 case S_TRISTATE:
 723                         switch (sym_get_tristate_value(sym)) {
 724                         case no:
 725                                 break;
 726                         case mod:
 727                                 fprintf(out, "CONFIG_%s=m\n", sym->name);
 728                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 729                                 break;
 730                         case yes:
 731                                 fprintf(out, "CONFIG_%s=y\n", sym->name);
 732                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 733                                 break;
 734                         }
 735                         break;
 736                 case S_STRING:
 737                         str = sym_get_string_value(sym);
 738                         fprintf(out, "CONFIG_%s=\"", sym->name);
 739                         fprintf(out_h, "#define CONFIG_%s \"", sym->name);
 740                         while (1) {
 741                                 l = strcspn(str, "\"\\");
 742                                 if (l) {
 743                                         fwrite(str, l, 1, out);
 744                                         fwrite(str, l, 1, out_h);
 745                                         str += l;
 746                                 }
 747                                 if (!*str)
 748                                         break;
 749                                 fprintf(out, "\\%c", *str);
 750                                 fprintf(out_h, "\\%c", *str);
 751                                 str++;
 752                         }
 753                         fputs("\"\n", out);
 754                         fputs("\"\n", out_h);
 755                         break;
 756                 case S_HEX:
 757                         str = sym_get_string_value(sym);
 758                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 759                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 760                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 761                                 break;
 762                         }
 763                 case S_INT:
 764                         str = sym_get_string_value(sym);
 765                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 766                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 767                         break;
 768                 default:
 769                         break;
 770                 }
 771         }
 772         fclose(out);
 773         fclose(out_h);
 774
 775         name = getenv("KCONFIG_AUTOHEADER");
 776         if (!name)
 777                 name = "include/linux/autoconf.h";
 778         if (rename(".tmpconfig.h", name))
 779                 return 1;
 780         name = getenv("KCONFIG_AUTOCONFIG");
 781         if (!name)
 782                 name = "include/config/auto.conf";
 783         /*
 784          * This must be the last step, kbuild has a dependency on auto.conf
 785          * and this marks the successful completion of the previous steps.
 786          */
 787         if (rename(".tmpconfig", name))
 788                 return 1;
 789
 790         return 0;
 791 }
 792
 793 static int sym_change_count;
 794 static void (*conf_changed_callback)(void);
 795
 796 void sym_set_change_count(int count)
 797 {
 798         int _sym_change_count = sym_change_count;
 799         sym_change_count = count;
 800         if (conf_changed_callback &&
 801             (bool)_sym_change_count != (bool)count)
 802                 conf_changed_callback();
 803 }
 804
 805 void sym_add_change_count(int count)
 806 {
 807         sym_set_change_count(count + sym_change_count);
 808 }
 809
 810 bool conf_get_changed(void)
 811 {
 812         return sym_change_count;
 813 }
 814
 815 void conf_set_changed_callback(void (*fn)(void))
 816 {
 817         conf_changed_callback = fn;
 818 }