package/config/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 #include <libgen.h>
  15
  16 #define LKC_DIRECT_LINK
  17 #include "lkc.h"
  18
  19 static void conf_warning(const char *fmt, ...)
  20         __attribute__ ((format (printf, 1, 2)));
  21
  22 static const char *conf_filename;
  23 static int conf_lineno, conf_warnings, conf_unsaved;
  24
  25 const char conf_defname[] = ".defconfig";
  26
  27 static void conf_warning(const char *fmt, ...)
  28 {
  29         va_list ap;
  30         va_start(ap, fmt);
  31         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  32         vfprintf(stderr, fmt, ap);
  33         fprintf(stderr, "\n");
  34         va_end(ap);
  35         conf_warnings++;
  36 }
  37
  38 const char *conf_get_configname(void)
  39 {
  40         char *name = getenv("BUILDROOT_CONFIG");
  41
  42         return name ? name : ".config";
  43 }
  44
  45 static char *conf_expand_value(const char *in)
  46 {
  47         struct symbol *sym;
  48         const char *src;
  49         static char res_value[SYMBOL_MAXLENGTH];
  50         char *dst, name[SYMBOL_MAXLENGTH];
  51
  52         res_value[0] = 0;
  53         dst = name;
  54         while ((src = strchr(in, '$'))) {
  55                 strncat(res_value, in, src - in);
  56                 src++;
  57                 dst = name;
  58                 while (isalnum(*src) || *src == '_')
  59                         *dst++ = *src++;
  60                 *dst = 0;
  61                 sym = sym_lookup(name, 0);
  62                 sym_calc_value(sym);
  63                 strcat(res_value, sym_get_string_value(sym));
  64                 in = src;
  65         }
  66         strcat(res_value, in);
  67
  68         return res_value;
  69 }
  70
  71 char *conf_get_default_confname(void)
  72 {
  73         struct stat buf;
  74         static char fullname[PATH_MAX+1];
  75         char *env, *name;
  76
  77         name = conf_expand_value(conf_defname);
  78         env = getenv(SRCTREE);
  79         if (env) {
  80                 sprintf(fullname, "%s/%s", env, name);
  81                 if (!stat(fullname, &buf))
  82                         return fullname;
  83         }
  84         return name;
  85 }
  86
  87 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
  88 {
  89         char *p2;
  90
  91         switch (sym->type) {
  92         case S_TRISTATE:
  93                 if (p[0] == 'm') {
  94                         sym->def[def].tri = mod;
  95                         sym->flags |= def_flags;
  96                         break;
  97                 }
  98         case S_BOOLEAN:
  99                 if (p[0] == 'y') {
 100                         sym->def[def].tri = yes;
 101                         sym->flags |= def_flags;
 102                         break;
 103                 }
 104                 if (p[0] == 'n') {
 105                         sym->def[def].tri = no;
 106                         sym->flags |= def_flags;
 107                         break;
 108                 }
 109                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 110                 break;
 111         case S_OTHER:
 112                 if (*p != '"') {
 113                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 114                                 ;
 115                         sym->type = S_STRING;
 116                         goto done;
 117                 }
 118         case S_STRING:
 119                 if (*p++ != '"')
 120                         break;
 121                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 122                         if (*p2 == '"') {
 123                                 *p2 = 0;
 124                                 break;
 125                         }
 126                         memmove(p2, p2 + 1, strlen(p2));
 127                 }
 128                 if (!p2) {
 129                         conf_warning("invalid string found");
 130                         return 1;
 131                 }
 132         case S_INT:
 133         case S_HEX:
 134         done:
 135                 if (sym_string_valid(sym, p)) {
 136                         sym->def[def].val = strdup(p);
 137                         sym->flags |= def_flags;
 138                 } else {
 139                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 140                         return 1;
 141                 }
 142                 break;
 143         default:
 144                 ;
 145         }
 146         return 0;
 147 }
 148
 149 int conf_read_simple(const char *name, int def)
 150 {
 151         FILE *in = NULL;
 152         char line[1024];
 153         char *p, *p2;
 154         struct symbol *sym;
 155         int i, def_flags;
 156
 157         if (name) {
 158                 in = zconf_fopen(name);
 159         } else {
 160                 struct property *prop;
 161
 162                 name = conf_get_configname();
 163                 in = zconf_fopen(name);
 164                 if (in)
 165                         goto load;
 166                 sym_add_change_count(1);
 167                 if (!sym_defconfig_list)
 168                         return 1;
 169
 170                 for_all_defaults(sym_defconfig_list, prop) {
 171                         if (expr_calc_value(prop->visible.expr) == no ||
 172                             prop->expr->type != E_SYMBOL)
 173                                 continue;
 174                         name = conf_expand_value(prop->expr->left.sym->name);
 175                         in = zconf_fopen(name);
 176                         if (in) {
 177                                 printf(_("#\n"
 178                                          "# using defaults found in %s\n"
 179                                          "#\n"), name);
 180                                 goto load;
 181                         }
 182                 }
 183         }
 184         if (!in)
 185                 return 1;
 186
 187 load:
 188         conf_filename = name;
 189         conf_lineno = 0;
 190         conf_warnings = 0;
 191         conf_unsaved = 0;
 192
 193         def_flags = SYMBOL_DEF << def;
 194         for_all_symbols(i, sym) {
 195                 sym->flags |= SYMBOL_CHANGED;
 196                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 197                 if (sym_is_choice(sym))
 198                         sym->flags |= def_flags;
 199                 switch (sym->type) {
 200                 case S_INT:
 201                 case S_HEX:
 202                 case S_STRING:
 203                         if (sym->def[def].val)
 204                                 free(sym->def[def].val);
 205                 default:
 206                         sym->def[def].val = NULL;
 207                         sym->def[def].tri = no;
 208                 }
 209         }
 210
 211         while (fgets(line, sizeof(line), in)) {
 212                 conf_lineno++;
 213                 sym = NULL;
 214                 switch (line[0]) {
 215                 case '#':
 216                         if (line[1]!=' ')
 217                                 continue;
 218                         p = strchr(line + 2, ' ');
 219                         if (!p)
 220                                 continue;
 221                         *p++ = 0;
 222                         if (strncmp(p, "is not set", 10))
 223                                 continue;
 224                         if (def == S_DEF_USER) {
 225                                 sym = sym_find(line + 2);
 226                                 if (!sym) {
 227                                         conf_warning("trying to assign nonexistent symbol %s", line + 2);
 228                                         break;
 229                                 }
 230                         } else {
 231                                 sym = sym_lookup(line + 2, 0);
 232                                 if (sym->type == S_UNKNOWN)
 233                                         sym->type = S_BOOLEAN;
 234                         }
 235                         if (sym->flags & def_flags) {
 236                                 conf_warning("trying to reassign symbol %s", sym->name);
 237                                 break;
 238                         }
 239                         switch (sym->type) {
 240                         case S_BOOLEAN:
 241                         case S_TRISTATE:
 242                                 sym->def[def].tri = no;
 243                                 sym->flags |= def_flags;
 244                                 break;
 245                         default:
 246                                 ;
 247                         }
 248                         break;
 249                 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
 250                         p = strchr(line, '=');
 251                         if (!p)
 252                                 continue;
 253                         *p++ = 0;
 254                         p2 = strchr(p, '\n');
 255                         if (p2) {
 256                                 *p2-- = 0;
 257                                 if (*p2 == '\r')
 258                                         *p2 = 0;
 259                         }
 260                         if (def == S_DEF_USER) {
 261                                 sym = sym_find(line);
 262                                 if (!sym) {
 263                                         conf_warning("trying to assign nonexistent symbol %s", line);
 264                                         break;
 265                                 }
 266                         } else {
 267                                 sym = sym_lookup(line, 0);
 268                                 if (sym->type == S_UNKNOWN)
 269                                         sym->type = S_OTHER;
 270                         }
 271                         if (sym->flags & def_flags) {
 272                                 conf_warning("trying to reassign symbol %s", sym->name);
 273                                 break;
 274                         }
 275                         if (conf_set_sym_val(sym, def, def_flags, p))
 276                                 continue;
 277                         break;
 278                 case '\r':
 279                 case '\n':
 280                         break;
 281                 default:
 282                         conf_warning("unexpected data");
 283                         continue;
 284                 }
 285                 if (sym && sym_is_choice_value(sym)) {
 286                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 287                         switch (sym->def[def].tri) {
 288                         case no:
 289                                 break;
 290                         case mod:
 291                                 if (cs->def[def].tri == yes) {
 292                                         conf_warning("%s creates inconsistent choice state", sym->name);
 293                                         cs->flags &= ~def_flags;
 294                                 }
 295                                 break;
 296                         case yes:
 297                                 if (cs->def[def].tri != no) {
 298                                         conf_warning("%s creates inconsistent choice state", sym->name);
 299                                         cs->flags &= ~def_flags;
 300                                 } else
 301                                         cs->def[def].val = sym;
 302                                 break;
 303                         }
 304                         cs->def[def].tri = E_OR(cs->def[def].tri, sym->def[def].tri);
 305                 }
 306         }
 307         fclose(in);
 308
 309         if (modules_sym)
 310                 sym_calc_value(modules_sym);
 311         return 0;
 312 }
 313
 314 int conf_read(const char *name)
 315 {
 316         struct symbol *sym;
 317         struct property *prop;
 318         struct expr *e;
 319         int i, flags;
 320
 321         sym_set_change_count(0);
 322
 323         if (conf_read_simple(name, S_DEF_USER))
 324                 return 1;
 325
 326         for_all_symbols(i, sym) {
 327                 sym_calc_value(sym);
 328                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 329                         goto sym_ok;
 330                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 331                         /* check that calculated value agrees with saved value */
 332                         switch (sym->type) {
 333                         case S_BOOLEAN:
 334                         case S_TRISTATE:
 335                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 336                                         break;
 337                                 if (!sym_is_choice(sym))
 338                                         goto sym_ok;
 339                         default:
 340                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 341                                         goto sym_ok;
 342                                 break;
 343                         }
 344                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 345                         /* no previous value and not saved */
 346                         goto sym_ok;
 347                 conf_unsaved++;
 348                 /* maybe print value in verbose mode... */
 349         sym_ok:
 350                 if (!sym_is_choice(sym))
 351                         continue;
 352                 /* The choice symbol only has a set value (and thus is not new)
 353                  * if all its visible childs have values.
 354                  */
 355                 prop = sym_get_choice_prop(sym);
 356                 flags = sym->flags;
 357                 for (e = prop->expr; e; e = e->left.expr)
 358                         if (e->right.sym->visible != no)
 359                                 flags &= e->right.sym->flags;
 360                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 361         }
 362
 363         for_all_symbols(i, sym) {
 364                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 365                         /* Reset values of generates values, so they'll appear
 366                          * as new, if they should become visible, but that
 367                          * doesn't quite work if the Kconfig and the saved
 368                          * configuration disagree.
 369                          */
 370                         if (sym->visible == no && !conf_unsaved)
 371                                 sym->flags &= ~SYMBOL_DEF_USER;
 372                         switch (sym->type) {
 373                         case S_STRING:
 374                         case S_INT:
 375                         case S_HEX:
 376                                 /* Reset a string value if it's out of range */
 377                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 378                                         break;
 379                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 380                                 conf_unsaved++;
 381                                 break;
 382                         default:
 383                                 break;
 384                         }
 385                 }
 386         }
 387
 388         sym_add_change_count(conf_warnings || conf_unsaved);
 389
 390         return 0;
 391 }
 392
 393 int conf_write(const char *name)
 394 {
 395         FILE *out;
 396         struct symbol *sym;
 397         struct menu *menu;
 398         const char *basename;
 399         char dirname[128], tmpname[128], newname[128];
 400         int type, l;
 401         const char *str;
 402         time_t now;
 403         int use_timestamp = 1;
 404         char *env;
 405
 406         dirname[0] = 0;
 407         if (name && name[0]) {
 408                 struct stat st;
 409                 char *slash;
 410
 411                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 412                         strcpy(dirname, name);
 413                         strcat(dirname, "/");
 414                         basename = conf_get_configname();
 415                 } else if ((slash = strrchr(name, '/'))) {
 416                         int size = slash - name + 1;
 417                         memcpy(dirname, name, size);
 418                         dirname[size] = 0;
 419                         if (slash[1])
 420                                 basename = slash + 1;
 421                         else
 422                                 basename = conf_get_configname();
 423                 } else
 424                         basename = name;
 425         } else
 426                 basename = conf_get_configname();
 427
 428         sprintf(newname, "%s%s", dirname, basename);
 429         env = getenv("KCONFIG_OVERWRITECONFIG");
 430         if (!env || !*env) {
 431                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 432                 out = fopen(tmpname, "w");
 433         } else {
 434                 *tmpname = 0;
 435                 out = fopen(newname, "w");
 436         }
 437         if (!out)
 438                 return 1;
 439
 440         sym = sym_lookup("BR2_VERSION", 0);
 441         sym_calc_value(sym);
 442         time(&now);
 443         env = getenv("KCONFIG_NOTIMESTAMP");
 444         if (env && *env)
 445                 use_timestamp = 0;
 446
 447         fprintf(out, _("#\n"
 448                        "# Automatically generated make config: don't edit\n"
 449                        "%s%s"
 450                        "#\n"),
 451                      use_timestamp ? "# " : "",
 452                      use_timestamp ? ctime(&now) : "");
 453
 454         if (!conf_get_changed())
 455                 sym_clear_all_valid();
 456
 457         menu = rootmenu.list;
 458         while (menu) {
 459                 sym = menu->sym;
 460                 if (!sym) {
 461                         if (!menu_is_visible(menu))
 462                                 goto next;
 463                         str = menu_get_prompt(menu);
 464                         fprintf(out, "\n"
 465                                      "#\n"
 466                                      "# %s\n"
 467                                      "#\n", str);
 468                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 469                         sym_calc_value(sym);
 470                         if (!(sym->flags & SYMBOL_WRITE))
 471                                 goto next;
 472                         sym->flags &= ~SYMBOL_WRITE;
 473                         type = sym->type;
 474                         if (type == S_TRISTATE) {
 475                                 sym_calc_value(modules_sym);
 476                                 if (modules_sym->curr.tri == no)
 477                                         type = S_BOOLEAN;
 478                         }
 479                         switch (type) {
 480                         case S_BOOLEAN:
 481                         case S_TRISTATE:
 482                                 switch (sym_get_tristate_value(sym)) {
 483                                 case no:
 484                                         fprintf(out, "# %s is not set\n", sym->name);
 485                                         break;
 486                                 case mod:
 487                                         fprintf(out, "%s=m\n", sym->name);
 488                                         break;
 489                                 case yes:
 490                                         fprintf(out, "%s=y\n", sym->name);
 491                                         break;
 492                                 }
 493                                 break;
 494                         case S_STRING:
 495                                 str = sym_get_string_value(sym);
 496                                 fprintf(out, "%s=\"", sym->name);
 497                                 while (1) {
 498                                         l = strcspn(str, "\"\\");
 499                                         if (l) {
 500                                                 fwrite(str, l, 1, out);
 501                                                 str += l;
 502                                         }
 503                                         if (!*str)
 504                                                 break;
 505                                         fprintf(out, "\\%c", *str++);
 506                                 }
 507                                 fputs("\"\n", out);
 508                                 break;
 509                         case S_HEX:
 510                                 str = sym_get_string_value(sym);
 511                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 512                                         fprintf(out, "%s=%s\n", sym->name, str);
 513                                         break;
 514                                 }
 515                         case S_INT:
 516                                 str = sym_get_string_value(sym);
 517                                 fprintf(out, "%s=%s\n", sym->name, str);
 518                                 break;
 519                         }
 520                 }
 521
 522         next:
 523                 if (menu->list) {
 524                         menu = menu->list;
 525                         continue;
 526                 }
 527                 if (menu->next)
 528                         menu = menu->next;
 529                 else while ((menu = menu->parent)) {
 530                         if (menu->next) {
 531                                 menu = menu->next;
 532                                 break;
 533                         }
 534                 }
 535         }
 536         fclose(out);
 537
 538         if (*tmpname) {
 539                 strcat(dirname, basename);
 540                 strcat(dirname, ".old");
 541                 rename(newname, dirname);
 542                 if (rename(tmpname, newname))
 543                         return 1;
 544         }
 545
 546         printf(_("#\n"
 547                  "# configuration written to %s\n"
 548                  "#\n"), newname);
 549
 550         sym_set_change_count(0);
 551
 552         return 0;
 553 }
 554
 555 int conf_split_config(void)
 556 {
 557         char *name, path[128], *opwd, *dir, *_name;
 558         char *s, *d, c;
 559         struct symbol *sym;
 560         struct stat sb;
 561         int res, i, fd;
 562
 563         name = getenv("KCONFIG_AUTOCONFIG");
 564         if (!name)
 565                 name = "include/config/auto.conf";
 566         conf_read_simple(name, S_DEF_AUTO);
 567
 568         opwd = malloc(256);
 569         _name = strdup(name);
 570         if (opwd == NULL || _name == NULL)
 571                 return 1;
 572         opwd = getcwd(opwd, 256);
 573         dir = dirname(_name);
 574         if (dir == NULL) {
 575                 res = 1;
 576                 goto err;
 577         }
 578         if (chdir(dir)) {
 579                 res = 1;
 580                 goto err;
 581         }
 582
 583         res = 0;
 584         for_all_symbols(i, sym) {
 585                 sym_calc_value(sym);
 586                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 587                         continue;
 588                 if (sym->flags & SYMBOL_WRITE) {
 589                         if (sym->flags & SYMBOL_DEF_AUTO) {
 590                                 /*
 591                                  * symbol has old and new value,
 592                                  * so compare them...
 593                                  */
 594                                 switch (sym->type) {
 595                                 case S_BOOLEAN:
 596                                 case S_TRISTATE:
 597                                         if (sym_get_tristate_value(sym) ==
 598                                             sym->def[S_DEF_AUTO].tri)
 599                                                 continue;
 600                                         break;
 601                                 case S_STRING:
 602                                 case S_HEX:
 603                                 case S_INT:
 604                                         if (!strcmp(sym_get_string_value(sym),
 605                                                     sym->def[S_DEF_AUTO].val))
 606                                                 continue;
 607                                         break;
 608                                 default:
 609                                         break;
 610                                 }
 611                         } else {
 612                                 /*
 613                                  * If there is no old value, only 'no' (unset)
 614                                  * is allowed as new value.
 615                                  */
 616                                 switch (sym->type) {
 617                                 case S_BOOLEAN:
 618                                 case S_TRISTATE:
 619                                         if (sym_get_tristate_value(sym) == no)
 620                                                 continue;
 621                                         break;
 622                                 default:
 623                                         break;
 624                                 }
 625                         }
 626                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 627                         /* There is neither an old nor a new value. */
 628                         continue;
 629                 /* else
 630                  *      There is an old value, but no new value ('no' (unset)
 631                  *      isn't saved in auto.conf, so the old value is always
 632                  *      different from 'no').
 633                  */
 634
 635                 /* Replace all '_' and append ".h" */
 636                 s = sym->name;
 637                 d = path;
 638                 while ((c = *s++)) {
 639                         c = tolower(c);
 640                         *d++ = (c == '_') ? '/' : c;
 641                 }
 642                 strcpy(d, ".h");
 643
 644                 /* Assume directory path already exists. */
 645                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 646                 if (fd == -1) {
 647                         if (errno != ENOENT) {
 648                                 res = 1;
 649                                 break;
 650                         }
 651                         /*
 652                          * Create directory components,
 653                          * unless they exist already.
 654                          */
 655                         d = path;
 656                         while ((d = strchr(d, '/'))) {
 657                                 *d = 0;
 658                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 659                                         res = 1;
 660                                         goto out;
 661                                 }
 662                                 *d++ = '/';
 663                         }
 664                         /* Try it again. */
 665                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 666                         if (fd == -1) {
 667                                 res = 1;
 668                                 break;
 669                         }
 670                 }
 671                 close(fd);
 672         }
 673 out:
 674         if (chdir(opwd))
 675                 res = 1;
 676 err:
 677         free(opwd);
 678         free(_name);
 679         return res;
 680 }
 681
 682 int conf_write_autoconf(void)
 683 {
 684         struct symbol *sym;
 685         const char *str;
 686         char *name;
 687         FILE *out, *out_h;
 688         time_t now;
 689         int i, l;
 690
 691         sym_clear_all_valid();
 692
 693         file_write_dep(".config.cmd");
 694
 695         if (conf_split_config())
 696                 return 1;
 697
 698         out = fopen(".tmpconfig", "w");
 699         if (!out)
 700                 return 1;
 701
 702         out_h = fopen(".tmpconfig.h", "w");
 703         if (!out_h) {
 704                 fclose(out);
 705                 return 1;
 706         }
 707
 708         sym = sym_lookup("BR2_VERSION", 0);
 709         sym_calc_value(sym);
 710         time(&now);
 711         fprintf(out, "#\n"
 712                      "# Automatically generated make config: don't edit\n"
 713                      "# %s"
 714                      "#\n",
 715                      ctime(&now));
 716         fprintf(out_h, "/*\n"
 717                        " * Automatically generated C config: don't edit\n"
 718                        " * %s"
 719                        " */\n",
 720                        ctime(&now));
 721
 722         for_all_symbols(i, sym) {
 723                 sym_calc_value(sym);
 724                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 725                         continue;
 726                 switch (sym->type) {
 727                 case S_BOOLEAN:
 728                 case S_TRISTATE:
 729                         switch (sym_get_tristate_value(sym)) {
 730                         case no:
 731                                 break;
 732                         case mod:
 733                                 fprintf(out, "%s=m\n", sym->name);
 734                                 fprintf(out_h, "#define %s_MODULE 1\n", sym->name);
 735                                 break;
 736                         case yes:
 737                                 fprintf(out, "%s=y\n", sym->name);
 738                                 fprintf(out_h, "#define %s 1\n", sym->name);
 739                                 break;
 740                         }
 741                         break;
 742                 case S_STRING:
 743                         str = sym_get_string_value(sym);
 744                         fprintf(out, "%s=\"", sym->name);
 745                         fprintf(out_h, "#define %s \"", sym->name);
 746                         while (1) {
 747                                 l = strcspn(str, "\"\\");
 748                                 if (l) {
 749                                         fwrite(str, l, 1, out);
 750                                         fwrite(str, l, 1, out_h);
 751                                         str += l;
 752                                 }
 753                                 if (!*str)
 754                                         break;
 755                                 fprintf(out, "\\%c", *str);
 756                                 fprintf(out_h, "\\%c", *str);
 757                                 str++;
 758                         }
 759                         fputs("\"\n", out);
 760                         fputs("\"\n", out_h);
 761                         break;
 762                 case S_HEX:
 763                         str = sym_get_string_value(sym);
 764                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 765                                 fprintf(out, "%s=%s\n", sym->name, str);
 766                                 fprintf(out_h, "#define %s 0x%s\n", sym->name, str);
 767                                 break;
 768                         }
 769                 case S_INT:
 770                         str = sym_get_string_value(sym);
 771                         fprintf(out, "%s=%s\n", sym->name, str);
 772                         fprintf(out_h, "#define %s %s\n", sym->name, str);
 773                         break;
 774                 default:
 775                         break;
 776                 }
 777         }
 778         fclose(out);
 779         fclose(out_h);
 780
 781         name = getenv("KCONFIG_AUTOHEADER");
 782         if (!name)
 783                 name = "include/linux/autoconf.h";
 784         if (rename(".tmpconfig.h", name))
 785                 return 1;
 786         name = getenv("KCONFIG_AUTOCONFIG");
 787         if (!name)
 788                 name = "include/config/auto.conf";
 789         /*
 790          * This must be the last step, kbuild has a dependency on auto.conf
 791          * and this marks the successful completion of the previous steps.
 792          */
 793         if (rename(".tmpconfig", name))
 794                 return 1;
 795
 796         return 0;
 797 }
 798
 799 static int sym_change_count;
 800 static void (*conf_changed_callback)(void);
 801
 802 void sym_set_change_count(int count)
 803 {
 804         int _sym_change_count = sym_change_count;
 805         sym_change_count = count;
 806         if (conf_changed_callback &&
 807             (bool)_sym_change_count != (bool)count)
 808                 conf_changed_callback();
 809 }
 810
 811 void sym_add_change_count(int count)
 812 {
 813         sym_set_change_count(count + sym_change_count);
 814 }
 815
 816 bool conf_get_changed(void)
 817 {
 818         return sym_change_count;
 819 }
 820
 821 void conf_set_changed_callback(void (*fn)(void))
 822 {
 823         conf_changed_callback = fn;
 824 }