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 <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 static void conf_warning(const char *fmt, ...)
  20         __attribute__ ((format (printf, 1, 2)));
  21
  22 static void conf_message(const char *fmt, ...)
  23         __attribute__ ((format (printf, 1, 2)));
  24
  25 static const char *conf_filename;
  26 static int conf_lineno, conf_warnings, conf_unsaved;
  27
  28 const char conf_defname[] = "arch/$ARCH/defconfig";
  29
  30 static void conf_warning(const char *fmt, ...)
  31 {
  32         va_list ap;
  33         va_start(ap, fmt);
  34         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  35         vfprintf(stderr, fmt, ap);
  36         fprintf(stderr, "\n");
  37         va_end(ap);
  38         conf_warnings++;
  39 }
  40
  41 static void conf_default_message_callback(const char *fmt, va_list ap)
  42 {
  43         printf("#\n# ");
  44         vprintf(fmt, ap);
  45         printf("\n#\n");
  46 }
  47
  48 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  49         conf_default_message_callback;
  50 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  51 {
  52         conf_message_callback = fn;
  53 }
  54
  55 static void conf_message(const char *fmt, ...)
  56 {
  57         va_list ap;
  58
  59         va_start(ap, fmt);
  60         if (conf_message_callback)
  61                 conf_message_callback(fmt, ap);
  62 }
  63
  64 const char *conf_get_configname(void)
  65 {
  66         char *name = getenv("KCONFIG_CONFIG");
  67
  68         return name ? name : ".config";
  69 }
  70
  71 const char *conf_get_autoconfig_name(void)
  72 {
  73         char *name = getenv("KCONFIG_AUTOCONFIG");
  74
  75         return name ? name : "include/config/auto.conf";
  76 }
  77
  78 static char *conf_expand_value(const char *in)
  79 {
  80         struct symbol *sym;
  81         const char *src;
  82         static char res_value[SYMBOL_MAXLENGTH];
  83         char *dst, name[SYMBOL_MAXLENGTH];
  84
  85         res_value[0] = 0;
  86         dst = name;
  87         while ((src = strchr(in, '$'))) {
  88                 strncat(res_value, in, src - in);
  89                 src++;
  90                 dst = name;
  91                 while (isalnum(*src) || *src == '_')
  92                         *dst++ = *src++;
  93                 *dst = 0;
  94                 sym = sym_lookup(name, 0);
  95                 sym_calc_value(sym);
  96                 strcat(res_value, sym_get_string_value(sym));
  97                 in = src;
  98         }
  99         strcat(res_value, in);
 100
 101         return res_value;
 102 }
 103
 104 char *conf_get_default_confname(void)
 105 {
 106         struct stat buf;
 107         static char fullname[PATH_MAX+1];
 108         char *env, *name;
 109
 110         name = conf_expand_value(conf_defname);
 111         env = getenv(SRCTREE);
 112         if (env) {
 113                 sprintf(fullname, "%s/%s", env, name);
 114                 if (!stat(fullname, &buf))
 115                         return fullname;
 116         }
 117         return name;
 118 }
 119
 120 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 121 {
 122         char *p2;
 123
 124         switch (sym->type) {
 125         case S_TRISTATE:
 126                 if (p[0] == 'm') {
 127                         sym->def[def].tri = mod;
 128                         sym->flags |= def_flags;
 129                         break;
 130                 }
 131                 /* fall through */
 132         case S_BOOLEAN:
 133                 if (p[0] == 'y') {
 134                         sym->def[def].tri = yes;
 135                         sym->flags |= def_flags;
 136                         break;
 137                 }
 138                 if (p[0] == 'n') {
 139                         sym->def[def].tri = no;
 140                         sym->flags |= def_flags;
 141                         break;
 142                 }
 143                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 144                 return 1;
 145         case S_OTHER:
 146                 if (*p != '"') {
 147                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 148                                 ;
 149                         sym->type = S_STRING;
 150                         goto done;
 151                 }
 152                 /* fall through */
 153         case S_STRING:
 154                 if (*p++ != '"')
 155                         break;
 156                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 157                         if (*p2 == '"') {
 158                                 *p2 = 0;
 159                                 break;
 160                         }
 161                         memmove(p2, p2 + 1, strlen(p2));
 162                 }
 163                 if (!p2) {
 164                         conf_warning("invalid string found");
 165                         return 1;
 166                 }
 167                 /* fall through */
 168         case S_INT:
 169         case S_HEX:
 170         done:
 171                 if (sym_string_valid(sym, p)) {
 172                         sym->def[def].val = strdup(p);
 173                         sym->flags |= def_flags;
 174                 } else {
 175                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 176                         return 1;
 177                 }
 178                 break;
 179         default:
 180                 ;
 181         }
 182         return 0;
 183 }
 184
 185 int conf_read_simple(const char *name, int def)
 186 {
 187         FILE *in = NULL;
 188         char line[1024];
 189         char *p, *p2;
 190         struct symbol *sym;
 191         int i, def_flags;
 192
 193         if (name) {
 194                 in = zconf_fopen(name);
 195         } else {
 196                 struct property *prop;
 197
 198                 name = conf_get_configname();
 199                 in = zconf_fopen(name);
 200                 if (in)
 201                         goto load;
 202                 sym_add_change_count(1);
 203                 if (!sym_defconfig_list) {
 204                         if (modules_sym)
 205                                 sym_calc_value(modules_sym);
 206                         return 1;
 207                 }
 208
 209                 for_all_defaults(sym_defconfig_list, prop) {
 210                         if (expr_calc_value(prop->visible.expr) == no ||
 211                             prop->expr->type != E_SYMBOL)
 212                                 continue;
 213                         name = conf_expand_value(prop->expr->left.sym->name);
 214                         in = zconf_fopen(name);
 215                         if (in) {
 216                                 conf_message(_("using defaults found in %s"),
 217                                          name);
 218                                 goto load;
 219                         }
 220                 }
 221         }
 222         if (!in)
 223                 return 1;
 224
 225 load:
 226         conf_filename = name;
 227         conf_lineno = 0;
 228         conf_warnings = 0;
 229         conf_unsaved = 0;
 230
 231         def_flags = SYMBOL_DEF << def;
 232         for_all_symbols(i, sym) {
 233                 sym->flags |= SYMBOL_CHANGED;
 234                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 235                 if (sym_is_choice(sym))
 236                         sym->flags |= def_flags;
 237                 switch (sym->type) {
 238                 case S_INT:
 239                 case S_HEX:
 240                 case S_STRING:
 241                         if (sym->def[def].val)
 242                                 free(sym->def[def].val);
 243                         /* fall through */
 244                 default:
 245                         sym->def[def].val = NULL;
 246                         sym->def[def].tri = no;
 247                 }
 248         }
 249
 250         while (fgets(line, sizeof(line), in)) {
 251                 conf_lineno++;
 252                 sym = NULL;
 253                 if (line[0] == '#') {
 254                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 255                                 continue;
 256                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 257                         if (!p)
 258                                 continue;
 259                         *p++ = 0;
 260                         if (strncmp(p, "is not set", 10))
 261                                 continue;
 262                         if (def == S_DEF_USER) {
 263                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 264                                 if (!sym) {
 265                                         sym_add_change_count(1);
 266                                         goto setsym;
 267                                 }
 268                         } else {
 269                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 270                                 if (sym->type == S_UNKNOWN)
 271                                         sym->type = S_BOOLEAN;
 272                         }
 273                         if (sym->flags & def_flags) {
 274                                 conf_warning("override: reassigning to symbol %s", sym->name);
 275                         }
 276                         switch (sym->type) {
 277                         case S_BOOLEAN:
 278                         case S_TRISTATE:
 279                                 sym->def[def].tri = no;
 280                                 sym->flags |= def_flags;
 281                                 break;
 282                         default:
 283                                 ;
 284                         }
 285                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 286                         p = strchr(line + strlen(CONFIG_), '=');
 287                         if (!p)
 288                                 continue;
 289                         *p++ = 0;
 290                         p2 = strchr(p, '\n');
 291                         if (p2) {
 292                                 *p2-- = 0;
 293                                 if (*p2 == '\r')
 294                                         *p2 = 0;
 295                         }
 296                         if (def == S_DEF_USER) {
 297                                 sym = sym_find(line + strlen(CONFIG_));
 298                                 if (!sym) {
 299                                         sym_add_change_count(1);
 300                                         goto setsym;
 301                                 }
 302                         } else {
 303                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 304                                 if (sym->type == S_UNKNOWN)
 305                                         sym->type = S_OTHER;
 306                         }
 307                         if (sym->flags & def_flags) {
 308                                 conf_warning("override: reassigning to symbol %s", sym->name);
 309                         }
 310                         if (conf_set_sym_val(sym, def, def_flags, p))
 311                                 continue;
 312                 } else {
 313                         if (line[0] != '\r' && line[0] != '\n')
 314                                 conf_warning("unexpected data");
 315                         continue;
 316                 }
 317 setsym:
 318                 if (sym && sym_is_choice_value(sym)) {
 319                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 320                         switch (sym->def[def].tri) {
 321                         case no:
 322                                 break;
 323                         case mod:
 324                                 if (cs->def[def].tri == yes) {
 325                                         conf_warning("%s creates inconsistent choice state", sym->name);
 326                                         cs->flags &= ~def_flags;
 327                                 }
 328                                 break;
 329                         case yes:
 330                                 if (cs->def[def].tri != no)
 331                                         conf_warning("override: %s changes choice state", sym->name);
 332                                 cs->def[def].val = sym;
 333                                 break;
 334                         }
 335                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 336                 }
 337         }
 338         fclose(in);
 339
 340         if (modules_sym)
 341                 sym_calc_value(modules_sym);
 342         return 0;
 343 }
 344
 345 int conf_read(const char *name)
 346 {
 347         struct symbol *sym;
 348         int i;
 349
 350         sym_set_change_count(0);
 351
 352         if (conf_read_simple(name, S_DEF_USER))
 353                 return 1;
 354
 355         for_all_symbols(i, sym) {
 356                 sym_calc_value(sym);
 357                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 358                         continue;
 359                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 360                         /* check that calculated value agrees with saved value */
 361                         switch (sym->type) {
 362                         case S_BOOLEAN:
 363                         case S_TRISTATE:
 364                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 365                                         break;
 366                                 if (!sym_is_choice(sym))
 367                                         continue;
 368                                 /* fall through */
 369                         default:
 370                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 371                                         continue;
 372                                 break;
 373                         }
 374                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 375                         /* no previous value and not saved */
 376                         continue;
 377                 conf_unsaved++;
 378                 /* maybe print value in verbose mode... */
 379         }
 380
 381         for_all_symbols(i, sym) {
 382                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 383                         /* Reset values of generates values, so they'll appear
 384                          * as new, if they should become visible, but that
 385                          * doesn't quite work if the Kconfig and the saved
 386                          * configuration disagree.
 387                          */
 388                         if (sym->visible == no && !conf_unsaved)
 389                                 sym->flags &= ~SYMBOL_DEF_USER;
 390                         switch (sym->type) {
 391                         case S_STRING:
 392                         case S_INT:
 393                         case S_HEX:
 394                                 /* Reset a string value if it's out of range */
 395                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 396                                         break;
 397                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 398                                 conf_unsaved++;
 399                                 break;
 400                         default:
 401                                 break;
 402                         }
 403                 }
 404         }
 405
 406         sym_add_change_count(conf_warnings || conf_unsaved);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * Kconfig configuration printer
 413  *
 414  * This printer is used when generating the resulting configuration after
 415  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 416  * passing a non-NULL argument to the printer.
 417  *
 418  */
 419 static void
 420 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 421 {
 422
 423         switch (sym->type) {
 424         case S_BOOLEAN:
 425         case S_TRISTATE:
 426                 if (*value == 'n') {
 427                         bool skip_unset = (arg != NULL);
 428
 429                         if (!skip_unset)
 430                                 fprintf(fp, "# %s%s is not set\n",
 431                                     CONFIG_, sym->name);
 432                         return;
 433                 }
 434                 break;
 435         default:
 436                 break;
 437         }
 438
 439         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 440 }
 441
 442 static void
 443 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 444 {
 445         const char *p = value;
 446         size_t l;
 447
 448         for (;;) {
 449                 l = strcspn(p, "\n");
 450                 fprintf(fp, "#");
 451                 if (l) {
 452                         fprintf(fp, " ");
 453                         xfwrite(p, l, 1, fp);
 454                         p += l;
 455                 }
 456                 fprintf(fp, "\n");
 457                 if (*p++ == '\0')
 458                         break;
 459         }
 460 }
 461
 462 static struct conf_printer kconfig_printer_cb =
 463 {
 464         .print_symbol = kconfig_print_symbol,
 465         .print_comment = kconfig_print_comment,
 466 };
 467
 468 /*
 469  * Header printer
 470  *
 471  * This printer is used when generating the `include/generated/autoconf.h' file.
 472  */
 473 static void
 474 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 475 {
 476
 477         switch (sym->type) {
 478         case S_BOOLEAN:
 479         case S_TRISTATE: {
 480                 const char *suffix = "";
 481
 482                 switch (*value) {
 483                 case 'n':
 484                         break;
 485                 case 'm':
 486                         suffix = "_MODULE";
 487                         /* fall through */
 488                 default:
 489                         fprintf(fp, "#define %s%s%s 1\n",
 490                             CONFIG_, sym->name, suffix);
 491                 }
 492                 break;
 493         }
 494         case S_HEX: {
 495                 const char *prefix = "";
 496
 497                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 498                         prefix = "0x";
 499                 fprintf(fp, "#define %s%s %s%s\n",
 500                     CONFIG_, sym->name, prefix, value);
 501                 break;
 502         }
 503         case S_STRING:
 504         case S_INT:
 505                 fprintf(fp, "#define %s%s %s\n",
 506                     CONFIG_, sym->name, value);
 507                 break;
 508         default:
 509                 break;
 510         }
 511
 512 }
 513
 514 static void
 515 header_print_comment(FILE *fp, const char *value, void *arg)
 516 {
 517         const char *p = value;
 518         size_t l;
 519
 520         fprintf(fp, "/*\n");
 521         for (;;) {
 522                 l = strcspn(p, "\n");
 523                 fprintf(fp, " *");
 524                 if (l) {
 525                         fprintf(fp, " ");
 526                         xfwrite(p, l, 1, fp);
 527                         p += l;
 528                 }
 529                 fprintf(fp, "\n");
 530                 if (*p++ == '\0')
 531                         break;
 532         }
 533         fprintf(fp, " */\n");
 534 }
 535
 536 static struct conf_printer header_printer_cb =
 537 {
 538         .print_symbol = header_print_symbol,
 539         .print_comment = header_print_comment,
 540 };
 541
 542 /*
 543  * Tristate printer
 544  *
 545  * This printer is used when generating the `include/config/tristate.conf' file.
 546  */
 547 static void
 548 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 549 {
 550
 551         if (sym->type == S_TRISTATE && *value != 'n')
 552                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 553 }
 554
 555 static struct conf_printer tristate_printer_cb =
 556 {
 557         .print_symbol = tristate_print_symbol,
 558         .print_comment = kconfig_print_comment,
 559 };
 560
 561 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 562                               struct conf_printer *printer, void *printer_arg)
 563 {
 564         const char *str;
 565
 566         switch (sym->type) {
 567         case S_OTHER:
 568         case S_UNKNOWN:
 569                 break;
 570         case S_STRING:
 571                 str = sym_get_string_value(sym);
 572                 str = sym_escape_string_value(str);
 573                 printer->print_symbol(fp, sym, str, printer_arg);
 574                 free((void *)str);
 575                 break;
 576         default:
 577                 str = sym_get_string_value(sym);
 578                 printer->print_symbol(fp, sym, str, printer_arg);
 579         }
 580 }
 581
 582 static void
 583 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 584 {
 585         char buf[256];
 586
 587         snprintf(buf, sizeof(buf),
 588             "\n"
 589             "Automatically generated file; DO NOT EDIT.\n"
 590             "%s\n",
 591             rootmenu.prompt->text);
 592
 593         printer->print_comment(fp, buf, printer_arg);
 594 }
 595
 596 /*
 597  * Write out a minimal config.
 598  * All values that has default values are skipped as this is redundant.
 599  */
 600 int conf_write_defconfig(const char *filename)
 601 {
 602         struct symbol *sym;
 603         struct menu *menu;
 604         FILE *out;
 605
 606         out = fopen(filename, "w");
 607         if (!out)
 608                 return 1;
 609
 610         sym_clear_all_valid();
 611
 612         /* Traverse all menus to find all relevant symbols */
 613         menu = rootmenu.list;
 614
 615         while (menu != NULL)
 616         {
 617                 sym = menu->sym;
 618                 if (sym == NULL) {
 619                         if (!menu_is_visible(menu))
 620                                 goto next_menu;
 621                 } else if (!sym_is_choice(sym)) {
 622                         sym_calc_value(sym);
 623                         if (!(sym->flags & SYMBOL_WRITE))
 624                                 goto next_menu;
 625                         sym->flags &= ~SYMBOL_WRITE;
 626                         /* If we cannot change the symbol - skip */
 627                         if (!sym_is_changable(sym))
 628                                 goto next_menu;
 629                         /* If symbol equals to default value - skip */
 630                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 631                                 goto next_menu;
 632
 633                         /*
 634                          * If symbol is a choice value and equals to the
 635                          * default for a choice - skip.
 636                          * But only if value is bool and equal to "y" and
 637                          * choice is not "optional".
 638                          * (If choice is "optional" then all values can be "n")
 639                          */
 640                         if (sym_is_choice_value(sym)) {
 641                                 struct symbol *cs;
 642                                 struct symbol *ds;
 643
 644                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 645                                 ds = sym_choice_default(cs);
 646                                 if (!sym_is_optional(cs) && sym == ds) {
 647                                         if ((sym->type == S_BOOLEAN) &&
 648                                             sym_get_tristate_value(sym) == yes)
 649                                                 goto next_menu;
 650                                 }
 651                         }
 652                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 653                 }
 654 next_menu:
 655                 if (menu->list != NULL) {
 656                         menu = menu->list;
 657                 }
 658                 else if (menu->next != NULL) {
 659                         menu = menu->next;
 660                 } else {
 661                         while ((menu = menu->parent)) {
 662                                 if (menu->next != NULL) {
 663                                         menu = menu->next;
 664                                         break;
 665                                 }
 666                         }
 667                 }
 668         }
 669         fclose(out);
 670         return 0;
 671 }
 672
 673 int conf_write(const char *name)
 674 {
 675         FILE *out;
 676         struct symbol *sym;
 677         struct menu *menu;
 678         const char *basename;
 679         const char *str;
 680         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 681         char *env;
 682
 683         dirname[0] = 0;
 684         if (name && name[0]) {
 685                 struct stat st;
 686                 char *slash;
 687
 688                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 689                         strcpy(dirname, name);
 690                         strcat(dirname, "/");
 691                         basename = conf_get_configname();
 692                 } else if ((slash = strrchr(name, '/'))) {
 693                         int size = slash - name + 1;
 694                         memcpy(dirname, name, size);
 695                         dirname[size] = 0;
 696                         if (slash[1])
 697                                 basename = slash + 1;
 698                         else
 699                                 basename = conf_get_configname();
 700                 } else
 701                         basename = name;
 702         } else
 703                 basename = conf_get_configname();
 704
 705         sprintf(newname, "%s%s", dirname, basename);
 706         env = getenv("KCONFIG_OVERWRITECONFIG");
 707         if (!env || !*env) {
 708                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 709                 out = fopen(tmpname, "w");
 710         } else {
 711                 *tmpname = 0;
 712                 out = fopen(newname, "w");
 713         }
 714         if (!out)
 715                 return 1;
 716
 717         conf_write_heading(out, &kconfig_printer_cb, NULL);
 718
 719         if (!conf_get_changed())
 720                 sym_clear_all_valid();
 721
 722         menu = rootmenu.list;
 723         while (menu) {
 724                 sym = menu->sym;
 725                 if (!sym) {
 726                         if (!menu_is_visible(menu))
 727                                 goto next;
 728                         str = menu_get_prompt(menu);
 729                         fprintf(out, "\n"
 730                                      "#\n"
 731                                      "# %s\n"
 732                                      "#\n", str);
 733                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 734                         sym_calc_value(sym);
 735                         if (!(sym->flags & SYMBOL_WRITE))
 736                                 goto next;
 737                         sym->flags &= ~SYMBOL_WRITE;
 738
 739                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 740                 }
 741
 742 next:
 743                 if (menu->list) {
 744                         menu = menu->list;
 745                         continue;
 746                 }
 747                 if (menu->next)
 748                         menu = menu->next;
 749                 else while ((menu = menu->parent)) {
 750                         if (menu->next) {
 751                                 menu = menu->next;
 752                                 break;
 753                         }
 754                 }
 755         }
 756         fclose(out);
 757
 758         if (*tmpname) {
 759                 strcat(dirname, basename);
 760                 strcat(dirname, ".old");
 761                 rename(newname, dirname);
 762                 if (rename(tmpname, newname))
 763                         return 1;
 764         }
 765
 766         conf_message(_("configuration written to %s"), newname);
 767
 768         sym_set_change_count(0);
 769
 770         return 0;
 771 }
 772
 773 static int conf_split_config(void)
 774 {
 775         const char *name;
 776         char path[PATH_MAX+1];
 777         char *s, *d, c;
 778         struct symbol *sym;
 779         struct stat sb;
 780         int res, i, fd;
 781
 782         name = conf_get_autoconfig_name();
 783         conf_read_simple(name, S_DEF_AUTO);
 784
 785         if (chdir("include/config"))
 786                 return 1;
 787
 788         res = 0;
 789         for_all_symbols(i, sym) {
 790                 sym_calc_value(sym);
 791                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 792                         continue;
 793                 if (sym->flags & SYMBOL_WRITE) {
 794                         if (sym->flags & SYMBOL_DEF_AUTO) {
 795                                 /*
 796                                  * symbol has old and new value,
 797                                  * so compare them...
 798                                  */
 799                                 switch (sym->type) {
 800                                 case S_BOOLEAN:
 801                                 case S_TRISTATE:
 802                                         if (sym_get_tristate_value(sym) ==
 803                                             sym->def[S_DEF_AUTO].tri)
 804                                                 continue;
 805                                         break;
 806                                 case S_STRING:
 807                                 case S_HEX:
 808                                 case S_INT:
 809                                         if (!strcmp(sym_get_string_value(sym),
 810                                                     sym->def[S_DEF_AUTO].val))
 811                                                 continue;
 812                                         break;
 813                                 default:
 814                                         break;
 815                                 }
 816                         } else {
 817                                 /*
 818                                  * If there is no old value, only 'no' (unset)
 819                                  * is allowed as new value.
 820                                  */
 821                                 switch (sym->type) {
 822                                 case S_BOOLEAN:
 823                                 case S_TRISTATE:
 824                                         if (sym_get_tristate_value(sym) == no)
 825                                                 continue;
 826                                         break;
 827                                 default:
 828                                         break;
 829                                 }
 830                         }
 831                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 832                         /* There is neither an old nor a new value. */
 833                         continue;
 834                 /* else
 835                  *      There is an old value, but no new value ('no' (unset)
 836                  *      isn't saved in auto.conf, so the old value is always
 837                  *      different from 'no').
 838                  */
 839
 840                 /* Replace all '_' and append ".h" */
 841                 s = sym->name;
 842                 d = path;
 843                 while ((c = *s++)) {
 844                         c = tolower(c);
 845                         *d++ = (c == '_') ? '/' : c;
 846                 }
 847                 strcpy(d, ".h");
 848
 849                 /* Assume directory path already exists. */
 850                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 851                 if (fd == -1) {
 852                         if (errno != ENOENT) {
 853                                 res = 1;
 854                                 break;
 855                         }
 856                         /*
 857                          * Create directory components,
 858                          * unless they exist already.
 859                          */
 860                         d = path;
 861                         while ((d = strchr(d, '/'))) {
 862                                 *d = 0;
 863                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 864                                         res = 1;
 865                                         goto out;
 866                                 }
 867                                 *d++ = '/';
 868                         }
 869                         /* Try it again. */
 870                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 871                         if (fd == -1) {
 872                                 res = 1;
 873                                 break;
 874                         }
 875                 }
 876                 close(fd);
 877         }
 878 out:
 879         if (chdir("../.."))
 880                 return 1;
 881
 882         return res;
 883 }
 884
 885 int conf_write_autoconf(void)
 886 {
 887         struct symbol *sym;
 888         const char *name;
 889         FILE *out, *tristate, *out_h;
 890         int i;
 891
 892         sym_clear_all_valid();
 893
 894         file_write_dep("include/config/auto.conf.cmd");
 895
 896         if (conf_split_config())
 897                 return 1;
 898
 899         out = fopen(".tmpconfig", "w");
 900         if (!out)
 901                 return 1;
 902
 903         tristate = fopen(".tmpconfig_tristate", "w");
 904         if (!tristate) {
 905                 fclose(out);
 906                 return 1;
 907         }
 908
 909         out_h = fopen(".tmpconfig.h", "w");
 910         if (!out_h) {
 911                 fclose(out);
 912                 fclose(tristate);
 913                 return 1;
 914         }
 915
 916         conf_write_heading(out, &kconfig_printer_cb, NULL);
 917
 918         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 919
 920         conf_write_heading(out_h, &header_printer_cb, NULL);
 921
 922         for_all_symbols(i, sym) {
 923                 sym_calc_value(sym);
 924                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 925                         continue;
 926
 927                 /* write symbol to auto.conf, tristate and header files */
 928                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 929
 930                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 931
 932                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 933         }
 934         fclose(out);
 935         fclose(tristate);
 936         fclose(out_h);
 937
 938         name = getenv("KCONFIG_AUTOHEADER");
 939         if (!name)
 940                 name = "include/generated/autoconf.h";
 941         if (rename(".tmpconfig.h", name))
 942                 return 1;
 943         name = getenv("KCONFIG_TRISTATE");
 944         if (!name)
 945                 name = "include/config/tristate.conf";
 946         if (rename(".tmpconfig_tristate", name))
 947                 return 1;
 948         name = conf_get_autoconfig_name();
 949         /*
 950          * This must be the last step, kbuild has a dependency on auto.conf
 951          * and this marks the successful completion of the previous steps.
 952          */
 953         if (rename(".tmpconfig", name))
 954                 return 1;
 955
 956         return 0;
 957 }
 958
 959 static int sym_change_count;
 960 static void (*conf_changed_callback)(void);
 961
 962 void sym_set_change_count(int count)
 963 {
 964         int _sym_change_count = sym_change_count;
 965         sym_change_count = count;
 966         if (conf_changed_callback &&
 967             (bool)_sym_change_count != (bool)count)
 968                 conf_changed_callback();
 969 }
 970
 971 void sym_add_change_count(int count)
 972 {
 973         sym_set_change_count(count + sym_change_count);
 974 }
 975
 976 bool conf_get_changed(void)
 977 {
 978         return sym_change_count;
 979 }
 980
 981 void conf_set_changed_callback(void (*fn)(void))
 982 {
 983         conf_changed_callback = fn;
 984 }
 985
 986 static void randomize_choice_values(struct symbol *csym)
 987 {
 988         struct property *prop;
 989         struct symbol *sym;
 990         struct expr *e;
 991         int cnt, def;
 992
 993         /*
 994          * If choice is mod then we may have more items selected
 995          * and if no then no-one.
 996          * In both cases stop.
 997          */
 998         if (csym->curr.tri != yes)
 999                 return;
1000
1001         prop = sym_get_choice_prop(csym);
1002
1003         /* count entries in choice block */
1004         cnt = 0;
1005         expr_list_for_each_sym(prop->expr, e, sym)
1006                 cnt++;
1007
1008         /*
1009          * find a random value and set it to yes,
1010          * set the rest to no so we have only one set
1011          */
1012         def = (rand() % cnt);
1013
1014         cnt = 0;
1015         expr_list_for_each_sym(prop->expr, e, sym) {
1016                 if (def == cnt++) {
1017                         sym->def[S_DEF_USER].tri = yes;
1018                         csym->def[S_DEF_USER].val = sym;
1019                 }
1020                 else {
1021                         sym->def[S_DEF_USER].tri = no;
1022                 }
1023         }
1024         csym->flags |= SYMBOL_DEF_USER;
1025         /* clear VALID to get value calculated */
1026         csym->flags &= ~(SYMBOL_VALID);
1027 }
1028
1029 static void set_all_choice_values(struct symbol *csym)
1030 {
1031         struct property *prop;
1032         struct symbol *sym;
1033         struct expr *e;
1034
1035         prop = sym_get_choice_prop(csym);
1036
1037         /*
1038          * Set all non-assinged choice values to no
1039          */
1040         expr_list_for_each_sym(prop->expr, e, sym) {
1041                 if (!sym_has_value(sym))
1042                         sym->def[S_DEF_USER].tri = no;
1043         }
1044         csym->flags |= SYMBOL_DEF_USER;
1045         /* clear VALID to get value calculated */
1046         csym->flags &= ~(SYMBOL_VALID);
1047 }
1048
1049 void conf_set_all_new_symbols(enum conf_def_mode mode)
1050 {
1051         struct symbol *sym, *csym;
1052         int i, cnt;
1053
1054         for_all_symbols(i, sym) {
1055                 if (sym_has_value(sym))
1056                         continue;
1057                 switch (sym_get_type(sym)) {
1058                 case S_BOOLEAN:
1059                 case S_TRISTATE:
1060                         switch (mode) {
1061                         case def_yes:
1062                                 sym->def[S_DEF_USER].tri = yes;
1063                                 break;
1064                         case def_mod:
1065                                 sym->def[S_DEF_USER].tri = mod;
1066                                 break;
1067                         case def_no:
1068                                 sym->def[S_DEF_USER].tri = no;
1069                                 break;
1070                         case def_random:
1071                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1072                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1073                                 break;
1074                         default:
1075                                 continue;
1076                         }
1077                         if (!(sym_is_choice(sym) && mode == def_random))
1078                                 sym->flags |= SYMBOL_DEF_USER;
1079                         break;
1080                 default:
1081                         break;
1082                 }
1083
1084         }
1085
1086         sym_clear_all_valid();
1087
1088         /*
1089          * We have different type of choice blocks.
1090          * If curr.tri equals to mod then we can select several
1091          * choice symbols in one block.
1092          * In this case we do nothing.
1093          * If curr.tri equals yes then only one symbol can be
1094          * selected in a choice block and we set it to yes,
1095          * and the rest to no.
1096          */
1097         for_all_symbols(i, csym) {
1098                 if (sym_has_value(csym) || !sym_is_choice(csym))
1099                         continue;
1100
1101                 sym_calc_value(csym);
1102                 if (mode == def_random)
1103                         randomize_choice_values(csym);
1104                 else
1105                         set_all_choice_values(csym);
1106         }
1107 }