kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <limits.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #define LKC_DIRECT_LINK
  18 #include "lkc.h"
  19
  20 static void conf_warning(const char *fmt, ...)
  21         __attribute__ ((format (printf, 1, 2)));
  22
  23 static const char *conf_filename;
  24 static int conf_lineno, conf_warnings, conf_unsaved;
  25
  26 #ifndef conf_defname
  27 const char conf_defname[] = "arch/$ARCH/defconfig";
  28 #endif
  29
  30 #ifndef CONFIG_PREFIX
  31 #define CONFIG_PREFIX "CONFIG_"
  32 #endif
  33
  34 static void conf_warning(const char *fmt, ...)
  35 {
  36         va_list ap;
  37         va_start(ap, fmt);
  38         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  39         vfprintf(stderr, fmt, ap);
  40         fprintf(stderr, "\n");
  41         va_end(ap);
  42         conf_warnings++;
  43 }
  44
  45 const char *conf_get_configname(void)
  46 {
  47         char *name = getenv("KCONFIG_CONFIG");
  48
  49         return name ? name : ".config";
  50 }
  51
  52 static char *conf_expand_value(const char *in)
  53 {
  54         struct symbol *sym;
  55         const char *src;
  56         static char res_value[SYMBOL_MAXLENGTH];
  57         char *dst, name[SYMBOL_MAXLENGTH];
  58
  59         res_value[0] = 0;
  60         dst = name;
  61         while ((src = strchr(in, '$'))) {
  62                 strncat(res_value, in, src - in);
  63                 src++;
  64                 dst = name;
  65                 while (isalnum(*src) || *src == '_')
  66                         *dst++ = *src++;
  67                 *dst = 0;
  68                 sym = sym_lookup(name, 0);
  69                 sym_calc_value(sym);
  70                 strcat(res_value, sym_get_string_value(sym));
  71                 in = src;
  72         }
  73         strcat(res_value, in);
  74
  75         return res_value;
  76 }
  77
  78 char *conf_get_default_confname(void)
  79 {
  80         struct stat buf;
  81         static char fullname[PATH_MAX+1];
  82         char *env, *name;
  83
  84         name = conf_expand_value(conf_defname);
  85         env = getenv(SRCTREE);
  86         if (env) {
  87                 sprintf(fullname, "%s/%s", env, name);
  88                 if (!stat(fullname, &buf))
  89                         return fullname;
  90         }
  91         return name;
  92 }
  93
  94 int conf_read_simple(const char *name, int def)
  95 {
  96         FILE *in = NULL;
  97         char line[1024];
  98         char *p, *p2;
  99         struct symbol *sym;
 100         int i, def_flags;
 101
 102         if (name) {
 103                 in = zconf_fopen(name);
 104         } else {
 105                 struct property *prop;
 106
 107                 name = conf_get_configname();
 108                 in = zconf_fopen(name);
 109                 if (in)
 110                         goto load;
 111                 sym_change_count++;
 112                 if (!sym_defconfig_list)
 113                         return 1;
 114
 115                 for_all_defaults(sym_defconfig_list, prop) {
 116                         if (expr_calc_value(prop->visible.expr) == no ||
 117                             prop->expr->type != E_SYMBOL)
 118                                 continue;
 119                         name = conf_expand_value(prop->expr->left.sym->name);
 120                         in = zconf_fopen(name);
 121                         if (in) {
 122                                 printf(_("#\n"
 123                                          "# using defaults found in %s\n"
 124                                          "#\n"), name);
 125                                 goto load;
 126                         }
 127                 }
 128         }
 129         if (!in)
 130                 return 1;
 131
 132 load:
 133         conf_filename = name;
 134         conf_lineno = 0;
 135         conf_warnings = 0;
 136         conf_unsaved = 0;
 137
 138         def_flags = SYMBOL_DEF << def;
 139         for_all_symbols(i, sym) {
 140                 sym->flags |= SYMBOL_CHANGED;
 141                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 142                 if (sym_is_choice(sym))
 143                         sym->flags |= def_flags;
 144                 switch (sym->type) {
 145                 case S_INT:
 146                 case S_HEX:
 147                 case S_STRING:
 148                         if (sym->def[def].val)
 149                                 free(sym->def[def].val);
 150                 default:
 151                         sym->def[def].val = NULL;
 152                         sym->def[def].tri = no;
 153                 }
 154         }
 155
 156         while (fgets(line, sizeof(line), in)) {
 157                 conf_lineno++;
 158                 sym = NULL;
 159                 switch (line[0]) {
 160                 case '#':
 161                         if (line[1]!=' ' || memcmp(line + 2, CONFIG_PREFIX,
 162                                                 strlen(CONFIG_PREFIX))) {
 163                                 continue;
 164                         }
 165                         p = strchr(line + 2 + strlen(CONFIG_PREFIX), ' ');
 166                         if (!p)
 167                                 continue;
 168                         *p++ = 0;
 169                         if (strncmp(p, "is not set", 10))
 170                                 continue;
 171                         if (def == S_DEF_USER) {
 172                                 sym = sym_find(line + 2 + strlen(CONFIG_PREFIX));
 173                                 if (!sym) {
 174                                         conf_warning("trying to assign nonexistent symbol %s", line + 2 + strlen(CONFIG_PREFIX));
 175                                         break;
 176                                 }
 177                         } else {
 178                                 sym = sym_lookup(line + 9, 0);
 179                                 if (sym->type == S_UNKNOWN)
 180                                         sym->type = S_BOOLEAN;
 181                         }
 182                         if (sym->flags & def_flags) {
 183                                 conf_warning("trying to reassign symbol %s", sym->name);
 184                                 break;
 185                         }
 186                         switch (sym->type) {
 187                         case S_BOOLEAN:
 188                         case S_TRISTATE:
 189                                 sym->def[def].tri = no;
 190                                 sym->flags |= def_flags;
 191                                 break;
 192                         default:
 193                                 ;
 194                         }
 195                         break;
 196                 case 'A' ... 'Z':
 197                         if (memcmp(line, CONFIG_PREFIX, strlen(CONFIG_PREFIX))) {
 198                                 conf_warning("unexpected data");
 199                                 continue;
 200                         }
 201                         p = strchr(line + strlen(CONFIG_PREFIX), '=');
 202                         if (!p)
 203                                 continue;
 204                         *p++ = 0;
 205                         p2 = strchr(p, '\n');
 206                         if (p2) {
 207                                 *p2-- = 0;
 208                                 if (*p2 == '\r')
 209                                         *p2 = 0;
 210                         }
 211                         if (def == S_DEF_USER) {
 212                                 sym = sym_find(line + strlen(CONFIG_PREFIX));
 213                                 if (!sym) {
 214                                         conf_warning("trying to assign nonexistent symbol %s", line + 7);
 215                                         break;
 216                                 }
 217                         } else {
 218                                 sym = sym_lookup(line + strlen(CONFIG_PREFIX), 0);
 219                                 if (sym->type == S_UNKNOWN)
 220                                         sym->type = S_OTHER;
 221                         }
 222                         if (sym->flags & def_flags) {
 223                                 conf_warning("trying to reassign symbol %s", sym->name);
 224                                 break;
 225                         }
 226                         switch (sym->type) {
 227                         case S_TRISTATE:
 228                                 if (p[0] == 'm') {
 229                                         sym->def[def].tri = mod;
 230                                         sym->flags |= def_flags;
 231                                         break;
 232                                 }
 233                         case S_BOOLEAN:
 234                                 if (p[0] == 'y') {
 235                                         sym->def[def].tri = yes;
 236                                         sym->flags |= def_flags;
 237                                         break;
 238                                 }
 239                                 if (p[0] == 'n') {
 240                                         sym->def[def].tri = no;
 241                                         sym->flags |= def_flags;
 242                                         break;
 243                                 }
 244                                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 245                                 break;
 246                         case S_OTHER:
 247                                 if (*p != '"') {
 248                                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 249                                                 ;
 250                                         sym->type = S_STRING;
 251                                         goto done;
 252                                 }
 253                         case S_STRING:
 254                                 if (*p++ != '"')
 255                                         break;
 256                                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 257                                         if (*p2 == '"') {
 258                                                 *p2 = 0;
 259                                                 break;
 260                                         }
 261                                         memmove(p2, p2 + 1, strlen(p2));
 262                                 }
 263                                 if (!p2) {
 264                                         conf_warning("invalid string found");
 265                                         continue;
 266                                 }
 267                         case S_INT:
 268                         case S_HEX:
 269                         done:
 270                                 if (sym_string_valid(sym, p)) {
 271                                         sym->def[def].val = strdup(p);
 272                                         sym->flags |= def_flags;
 273                                 } else {
 274                                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 275                                         continue;
 276                                 }
 277                                 break;
 278                         default:
 279                                 ;
 280                         }
 281                         break;
 282                 case '\r':
 283                 case '\n':
 284                         break;
 285                 default:
 286                         conf_warning("unexpected data");
 287                         continue;
 288                 }
 289                 if (sym && sym_is_choice_value(sym)) {
 290                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 291                         switch (sym->def[def].tri) {
 292                         case no:
 293                                 break;
 294                         case mod:
 295                                 if (cs->def[def].tri == yes) {
 296                                         conf_warning("%s creates inconsistent choice state", sym->name);
 297                                         cs->flags &= ~def_flags;
 298                                 }
 299                                 break;
 300                         case yes:
 301                                 if (cs->def[def].tri != no) {
 302                                         conf_warning("%s creates inconsistent choice state", sym->name);
 303                                         cs->flags &= ~def_flags;
 304                                 } else
 305                                         cs->def[def].val = sym;
 306                                 break;
 307                         }
 308                         cs->def[def].tri = E_OR(cs->def[def].tri, sym->def[def].tri);
 309                 }
 310         }
 311         fclose(in);
 312
 313         if (modules_sym)
 314                 sym_calc_value(modules_sym);
 315         return 0;
 316 }
 317
 318 int conf_read(const char *name)
 319 {
 320         struct symbol *sym;
 321         struct property *prop;
 322         struct expr *e;
 323         int i, flags;
 324
 325         sym_change_count = 0;
 326
 327         if (conf_read_simple(name, S_DEF_USER))
 328                 return 1;
 329
 330         for_all_symbols(i, sym) {
 331                 sym_calc_value(sym);
 332                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 333                         goto sym_ok;
 334                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 335                         /* check that calculated value agrees with saved value */
 336                         switch (sym->type) {
 337                         case S_BOOLEAN:
 338                         case S_TRISTATE:
 339                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 340                                         break;
 341                                 if (!sym_is_choice(sym))
 342                                         goto sym_ok;
 343                         default:
 344                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 345                                         goto sym_ok;
 346                                 break;
 347                         }
 348                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 349                         /* no previous value and not saved */
 350                         goto sym_ok;
 351                 conf_unsaved++;
 352                 /* maybe print value in verbose mode... */
 353         sym_ok:
 354                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 355                         if (sym->visible == no)
 356                                 sym->flags &= ~SYMBOL_DEF_USER;
 357                         switch (sym->type) {
 358                         case S_STRING:
 359                         case S_INT:
 360                         case S_HEX:
 361                                 if (!sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 362                                         sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 363                         default:
 364                                 break;
 365                         }
 366                 }
 367                 if (!sym_is_choice(sym))
 368                         continue;
 369                 prop = sym_get_choice_prop(sym);
 370                 flags = sym->flags;
 371                 for (e = prop->expr; e; e = e->left.expr)
 372                         if (e->right.sym->visible != no)
 373                                 flags &= e->right.sym->flags;
 374                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 375         }
 376
 377         sym_change_count += conf_warnings || conf_unsaved;
 378
 379         return 0;
 380 }
 381
 382 struct menu *next_menu(struct menu *menu)
 383 {
 384         if (menu->list) return menu->list;
 385         do {
 386                 if (menu->next) {
 387                         menu = menu->next;
 388                         break;
 389                 }
 390         } while ((menu = menu->parent));
 391
 392         return menu;
 393 }
 394
 395 #define SYMBOL_FORCEWRITE (1<<31)
 396
 397 int conf_write(const char *name)
 398 {
 399         FILE *out;
 400         struct symbol *sym;
 401         struct menu *menu;
 402         const char *basename;
 403         char dirname[128], tmpname[128], newname[128];
 404         int type, l, writetype;
 405         const char *str;
 406         time_t now;
 407         int use_timestamp = 1;
 408         char *env;
 409
 410         dirname[0] = 0;
 411         if (name && name[0]) {
 412                 struct stat st;
 413                 char *slash;
 414
 415                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 416                         strcpy(dirname, name);
 417                         strcat(dirname, "/");
 418                         basename = conf_get_configname();
 419                 } else if ((slash = strrchr(name, '/'))) {
 420                         int size = slash - name + 1;
 421                         memcpy(dirname, name, size);
 422                         dirname[size] = 0;
 423                         if (slash[1])
 424                                 basename = slash + 1;
 425                         else
 426                                 basename = conf_get_configname();
 427                 } else
 428                         basename = name;
 429         } else
 430                 basename = conf_get_configname();
 431
 432         sprintf(newname, "%s%s", dirname, basename);
 433         env = getenv("KCONFIG_OVERWRITECONFIG");
 434         if (!env || !*env) {
 435                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 436                 out = fopen(tmpname, "w");
 437         } else {
 438                 *tmpname = 0;
 439                 out = fopen(newname, "w");
 440         }
 441         if (!out)
 442                 return 1;
 443
 444         sym = sym_lookup("KCONFIG_VERSION", 0);
 445         sym_calc_value(sym);
 446         time(&now);
 447         env = getenv("KCONFIG_NOTIMESTAMP");
 448         if (env && *env)
 449                 use_timestamp = 0;
 450
 451         fprintf(out, _("#\n"
 452                        "# Automatically generated make config: don't edit\n"
 453                        "# "PROJECT_NAME" version: %s\n"
 454                        "%s%s"
 455                        "#\n"),
 456                      sym_get_string_value(sym),
 457                      use_timestamp ? "# " : "",
 458                      use_timestamp ? ctime(&now) : "");
 459
 460         if (!sym_change_count)
 461                 sym_clear_all_valid();
 462
 463         // Write out all symbols (even in closed sub-menus).
 464         if (1) {
 465                 for (menu = rootmenu.list; menu; menu = next_menu(menu))
 466                         if (menu->sym) menu->sym->flags |= SYMBOL_FORCEWRITE;
 467                 writetype = SYMBOL_FORCEWRITE;
 468
 469         // Don't write  out symbols in closed menus.
 470
 471         } else writetype = SYMBOL_WRITE;
 472
 473
 474         menu = rootmenu.list;
 475         while (menu) {
 476                 sym = menu->sym;
 477                 if (!sym) {
 478                         if (!menu_is_visible(menu))
 479                                 goto next;
 480                         str = menu_get_prompt(menu);
 481                         fprintf(out, "\n"
 482                                      "#\n"
 483                                      "# %s\n"
 484                                      "#\n", str);
 485                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 486                         sym_calc_value(sym);
 487                         if (!(sym->flags & writetype))
 488                                 goto next;
 489                         sym->flags &= ~writetype;
 490                         type = sym->type;
 491                         if (type == S_TRISTATE) {
 492                                 sym_calc_value(modules_sym);
 493                                 if (modules_sym->curr.tri == no)
 494                                         type = S_BOOLEAN;
 495                         }
 496                         switch (type) {
 497                         case S_BOOLEAN:
 498                         case S_TRISTATE:
 499                                 switch (sym_get_tristate_value(sym)) {
 500                                 case no:
 501                                         fprintf(out, "# "CONFIG_PREFIX"%s is not set\n", sym->name);
 502                                         break;
 503                                 case mod:
 504                                         fprintf(out, CONFIG_PREFIX"%s=m\n", sym->name);
 505                                         break;
 506                                 case yes:
 507                                         fprintf(out, CONFIG_PREFIX"%s=y\n", sym->name);
 508                                         break;
 509                                 }
 510                                 break;
 511                         case S_STRING:
 512                                 str = sym_get_string_value(sym);
 513                                 fprintf(out, CONFIG_PREFIX"%s=\"", sym->name);
 514                                 while (1) {
 515                                         l = strcspn(str, "\"\\");
 516                                         if (l) {
 517                                                 fwrite(str, l, 1, out);
 518                                                 str += l;
 519                                         }
 520                                         if (!*str)
 521                                                 break;
 522                                         fprintf(out, "\\%c", *str++);
 523                                 }
 524                                 fputs("\"\n", out);
 525                                 break;
 526                         case S_HEX:
 527                                 str = sym_get_string_value(sym);
 528                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 529                                         fprintf(out, CONFIG_PREFIX"%s=%s\n", sym->name, *str ? str : "0");
 530                                         break;
 531                                 }
 532                         case S_INT:
 533                                 str = sym_get_string_value(sym);
 534                                 fprintf(out, CONFIG_PREFIX"%s=%s\n", sym->name, *str ? str : "0");
 535                                 break;
 536                         }
 537                 }
 538
 539         next:
 540                 if (writetype == SYMBOL_WRITE) {
 541                         if (menu->list) {
 542                                 menu = menu->list;
 543                                 continue;
 544                         }
 545                         if (menu->next)
 546                                 menu = menu->next;
 547                         else while ((menu = menu->parent)) {
 548                                 if (menu->next) {
 549                                         menu = menu->next;
 550                                         break;
 551                                 }
 552                         }
 553                 } else
 554                         menu = next_menu(menu);
 555         }
 556         fclose(out);
 557
 558         if (*tmpname) {
 559                 strcat(dirname, basename);
 560                 strcat(dirname, ".old");
 561                 rename(newname, dirname);
 562                 if (rename(tmpname, newname))
 563                         return 1;
 564         }
 565
 566         printf(_("#\n"
 567                  "# configuration written to %s\n"
 568                  "#\n"), newname);
 569
 570         sym_change_count = 0;
 571
 572         return 0;
 573 }
 574
 575 int conf_split_config(void)
 576 {
 577         char *name, path[128];
 578         char *s, *d, c;
 579         struct symbol *sym;
 580         struct stat sb;
 581         int res, i, fd;
 582
 583         name = getenv("KCONFIG_AUTOCONFIG");
 584         if (!name)
 585                 name = "include/config/auto.conf";
 586         conf_read_simple(name, S_DEF_AUTO);
 587
 588         if (chdir("include/config"))
 589                 return 1;
 590
 591         res = 0;
 592         for_all_symbols(i, sym) {
 593                 sym_calc_value(sym);
 594                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 595                         continue;
 596                 if (sym->flags & SYMBOL_WRITE) {
 597                         if (sym->flags & SYMBOL_DEF_AUTO) {
 598                                 /*
 599                                  * symbol has old and new value,
 600                                  * so compare them...
 601                                  */
 602                                 switch (sym->type) {
 603                                 case S_BOOLEAN:
 604                                 case S_TRISTATE:
 605                                         if (sym_get_tristate_value(sym) ==
 606                                             sym->def[S_DEF_AUTO].tri)
 607                                                 continue;
 608                                         break;
 609                                 case S_STRING:
 610                                 case S_HEX:
 611                                 case S_INT:
 612                                         if (!strcmp(sym_get_string_value(sym),
 613                                                     sym->def[S_DEF_AUTO].val))
 614                                                 continue;
 615                                         break;
 616                                 default:
 617                                         break;
 618                                 }
 619                         } else {
 620                                 /*
 621                                  * If there is no old value, only 'no' (unset)
 622                                  * is allowed as new value.
 623                                  */
 624                                 switch (sym->type) {
 625                                 case S_BOOLEAN:
 626                                 case S_TRISTATE:
 627                                         if (sym_get_tristate_value(sym) == no)
 628                                                 continue;
 629                                         break;
 630                                 default:
 631                                         break;
 632                                 }
 633                         }
 634                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 635                         /* There is neither an old nor a new value. */
 636                         continue;
 637                 /* else
 638                  *      There is an old value, but no new value ('no' (unset)
 639                  *      isn't saved in auto.conf, so the old value is always
 640                  *      different from 'no').
 641                  */
 642
 643                 /* Replace all '_' and append ".h" */
 644                 s = sym->name;
 645                 d = path;
 646                 while ((c = *s++)) {
 647                         c = tolower(c);
 648                         *d++ = (c == '_') ? '/' : c;
 649                 }
 650                 strcpy(d, ".h");
 651
 652                 /* Assume directory path already exists. */
 653                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 654                 if (fd == -1) {
 655                         if (errno != ENOENT) {
 656                                 res = 1;
 657                                 break;
 658                         }
 659                         /*
 660                          * Create directory components,
 661                          * unless they exist already.
 662                          */
 663                         d = path;
 664                         while ((d = strchr(d, '/'))) {
 665                                 *d = 0;
 666                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 667                                         res = 1;
 668                                         goto out;
 669                                 }
 670                                 *d++ = '/';
 671                         }
 672                         /* Try it again. */
 673                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 674                         if (fd == -1) {
 675                                 res = 1;
 676                                 break;
 677                         }
 678                 }
 679                 close(fd);
 680         }
 681 out:
 682         if (chdir("../.."))
 683                 return 1;
 684
 685         return res;
 686 }
 687
 688 int conf_write_autoconf(void)
 689 {
 690         struct symbol *sym;
 691         const char *str;
 692         char *name;
 693         FILE *out, *out_h;
 694         time_t now;
 695         int i, l;
 696
 697         sym_clear_all_valid();
 698
 699         file_write_dep("include/config/auto.conf.cmd");
 700
 701         if (conf_split_config())
 702                 return 1;
 703
 704         out = fopen(".tmpconfig", "w");
 705         if (!out)
 706                 return 1;
 707
 708         out_h = fopen(".tmpconfig.h", "w");
 709         if (!out_h) {
 710                 fclose(out);
 711                 return 1;
 712         }
 713
 714         sym = sym_lookup("KCONFIG_VERSION", 0);
 715         sym_calc_value(sym);
 716         time(&now);
 717         fprintf(out, "#\n"
 718                      "# Automatically generated make config: don't edit\n"
 719                      "# "PROJECT_NAME" version: %s\n"
 720                      "# %s"
 721                      "#\n",
 722                      sym_get_string_value(sym), ctime(&now));
 723         fprintf(out_h, "/*\n"
 724                        " * Automatically generated C config: don't edit\n"
 725                        " * "PROJECT_NAME" version: %s\n"
 726                        " * %s"
 727                        " */\n"
 728                        // "#define AUTOCONF_INCLUDED\n"
 729                        , sym_get_string_value(sym), ctime(&now));
 730
 731         for_all_symbols(i, sym) {
 732                 sym_calc_value(sym);
 733                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 734                         continue;
 735                 switch (sym->type) {
 736                 case S_BOOLEAN:
 737                 case S_TRISTATE:
 738                         switch (sym_get_tristate_value(sym)) {
 739                         case no:
 740                                 break;
 741                         case mod:
 742                                 fprintf(out, CONFIG_PREFIX"%s=m\n", sym->name);
 743                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 744                                 break;
 745                         case yes:
 746                                 fprintf(out, CONFIG_PREFIX"%s=y\n", sym->name);
 747                                 fprintf(out_h, "#define "CONFIG_PREFIX"%s 1\n", sym->name);
 748                                 break;
 749                         }
 750                         break;
 751                 case S_STRING:
 752                         str = sym_get_string_value(sym);
 753                         fprintf(out, CONFIG_PREFIX"%s=\"", sym->name);
 754                         fprintf(out_h, "#define "CONFIG_PREFIX"%s \"", sym->name);
 755                         while (1) {
 756                                 l = strcspn(str, "\"\\");
 757                                 if (l) {
 758                                         fwrite(str, l, 1, out);
 759                                         fwrite(str, l, 1, out_h);
 760                                         str += l;
 761                                 }
 762                                 if (!*str)
 763                                         break;
 764                                 fprintf(out, "\\%c", *str);
 765                                 fprintf(out_h, "\\%c", *str);
 766                                 str++;
 767                         }
 768                         fputs("\"\n", out);
 769                         fputs("\"\n", out_h);
 770                         break;
 771                 case S_HEX:
 772                         str = sym_get_string_value(sym);
 773                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 774                                 fprintf(out, CONFIG_PREFIX"%s=%s\n", sym->name, str);
 775                                 fprintf(out_h, "#define "CONFIG_PREFIX"%s 0x%s\n", sym->name, str);
 776                                 break;
 777                         }
 778                 case S_INT:
 779                         str = sym_get_string_value(sym);
 780                         fprintf(out, CONFIG_PREFIX"%s=%s\n", sym->name, str);
 781                         fprintf(out_h, "#define "CONFIG_PREFIX"%s %s\n", sym->name, str);
 782                         break;
 783                 default:
 784                         break;
 785                 }
 786         }
 787         fclose(out);
 788         fclose(out_h);
 789
 790         name = getenv("KCONFIG_AUTOHEADER");
 791         if (!name)
 792                 name = "include/linux/autoconf.h";
 793         if (rename(".tmpconfig.h", name))
 794                 return 1;
 795         name = getenv("KCONFIG_AUTOCONFIG");
 796         if (!name)
 797                 name = "include/config/auto.conf";
 798         /*
 799          * This must be the last step, kbuild has a dependency on auto.conf
 800          * and this marks the successful completion of the previous steps.
 801          */
 802         if (rename(".tmpconfig", name))
 803                 return 1;
 804
 805         return 0;
 806 }