scripts/kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <[email protected]>
   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, *choice_sym;
 348         struct property *prop;
 349         struct expr *e;
 350         int i, flags;
 351
 352         sym_set_change_count(0);
 353
 354         if (conf_read_simple(name, S_DEF_USER))
 355                 return 1;
 356
 357         for_all_symbols(i, sym) {
 358                 sym_calc_value(sym);
 359                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 360                         goto sym_ok;
 361                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 362                         /* check that calculated value agrees with saved value */
 363                         switch (sym->type) {
 364                         case S_BOOLEAN:
 365                         case S_TRISTATE:
 366                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 367                                         break;
 368                                 if (!sym_is_choice(sym))
 369                                         goto sym_ok;
 370                                 /* fall through */
 371                         default:
 372                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 373                                         goto sym_ok;
 374                                 break;
 375                         }
 376                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 377                         /* no previous value and not saved */
 378                         goto sym_ok;
 379                 conf_unsaved++;
 380                 /* maybe print value in verbose mode... */
 381         sym_ok:
 382                 if (!sym_is_choice(sym))
 383                         continue;
 384                 /* The choice symbol only has a set value (and thus is not new)
 385                  * if all its visible childs have values.
 386                  */
 387                 prop = sym_get_choice_prop(sym);
 388                 flags = sym->flags;
 389                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 390                         if (choice_sym->visible != no)
 391                                 flags &= choice_sym->flags;
 392                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 393         }
 394
 395         for_all_symbols(i, sym) {
 396                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 397                         /* Reset values of generates values, so they'll appear
 398                          * as new, if they should become visible, but that
 399                          * doesn't quite work if the Kconfig and the saved
 400                          * configuration disagree.
 401                          */
 402                         if (sym->visible == no && !conf_unsaved)
 403                                 sym->flags &= ~SYMBOL_DEF_USER;
 404                         switch (sym->type) {
 405                         case S_STRING:
 406                         case S_INT:
 407                         case S_HEX:
 408                                 /* Reset a string value if it's out of range */
 409                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 410                                         break;
 411                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 412                                 conf_unsaved++;
 413                                 break;
 414                         default:
 415                                 break;
 416                         }
 417                 }
 418         }
 419
 420         sym_add_change_count(conf_warnings || conf_unsaved);
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * Kconfig configuration printer
 427  *
 428  * This printer is used when generating the resulting configuration after
 429  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 430  * passing a non-NULL argument to the printer.
 431  *
 432  */
 433 static void
 434 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 435 {
 436
 437         switch (sym->type) {
 438         case S_BOOLEAN:
 439         case S_TRISTATE:
 440                 if (*value == 'n') {
 441                         bool skip_unset = (arg != NULL);
 442
 443                         if (!skip_unset)
 444                                 fprintf(fp, "# %s%s is not set\n",
 445                                     CONFIG_, sym->name);
 446                         return;
 447                 }
 448                 break;
 449         default:
 450                 break;
 451         }
 452
 453         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 454 }
 455
 456 static void
 457 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 458 {
 459         const char *p = value;
 460         size_t l;
 461
 462         for (;;) {
 463                 l = strcspn(p, "\n");
 464                 fprintf(fp, "#");
 465                 if (l) {
 466                         fprintf(fp, " ");
 467                         fwrite(p, l, 1, fp);
 468                         p += l;
 469                 }
 470                 fprintf(fp, "\n");
 471                 if (*p++ == '\0')
 472                         break;
 473         }
 474 }
 475
 476 static struct conf_printer kconfig_printer_cb =
 477 {
 478         .print_symbol = kconfig_print_symbol,
 479         .print_comment = kconfig_print_comment,
 480 };
 481
 482 /*
 483  * Header printer
 484  *
 485  * This printer is used when generating the `include/generated/autoconf.h' file.
 486  */
 487 static void
 488 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 489 {
 490
 491         switch (sym->type) {
 492         case S_BOOLEAN:
 493         case S_TRISTATE: {
 494                 const char *suffix = "";
 495
 496                 switch (*value) {
 497                 case 'n':
 498                         break;
 499                 case 'm':
 500                         suffix = "_MODULE";
 501                         /* fall through */
 502                 default:
 503                         fprintf(fp, "#define %s%s%s 1\n",
 504                             CONFIG_, sym->name, suffix);
 505                 }
 506                 break;
 507         }
 508         case S_HEX: {
 509                 const char *prefix = "";
 510
 511                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 512                         prefix = "0x";
 513                 fprintf(fp, "#define %s%s %s%s\n",
 514                     CONFIG_, sym->name, prefix, value);
 515                 break;
 516         }
 517         case S_STRING:
 518         case S_INT:
 519                 fprintf(fp, "#define %s%s %s\n",
 520                     CONFIG_, sym->name, value);
 521                 break;
 522         default:
 523                 break;
 524         }
 525
 526 }
 527
 528 static void
 529 header_print_comment(FILE *fp, const char *value, void *arg)
 530 {
 531         const char *p = value;
 532         size_t l;
 533
 534         fprintf(fp, "/*\n");
 535         for (;;) {
 536                 l = strcspn(p, "\n");
 537                 fprintf(fp, " *");
 538                 if (l) {
 539                         fprintf(fp, " ");
 540                         fwrite(p, l, 1, fp);
 541                         p += l;
 542                 }
 543                 fprintf(fp, "\n");
 544                 if (*p++ == '\0')
 545                         break;
 546         }
 547         fprintf(fp, " */\n");
 548 }
 549
 550 static struct conf_printer header_printer_cb =
 551 {
 552         .print_symbol = header_print_symbol,
 553         .print_comment = header_print_comment,
 554 };
 555
 556 /*
 557  * Generate the __enabled_CONFIG_* and __enabled_CONFIG_*_MODULE macros for
 558  * use by the IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
 559  * generated even for booleans so that the IS_ENABLED() macro works.
 560  */
 561 static void
 562 header_print__enabled_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 563 {
 564
 565         switch (sym->type) {
 566         case S_BOOLEAN:
 567         case S_TRISTATE: {
 568                 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
 569                     sym->name, (*value == 'y'));
 570                 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
 571                     sym->name, (*value == 'm'));
 572                 break;
 573         }
 574         default:
 575                 break;
 576         }
 577 }
 578
 579 static struct conf_printer header__enabled_printer_cb =
 580 {
 581         .print_symbol = header_print__enabled_symbol,
 582         .print_comment = header_print_comment,
 583 };
 584
 585 /*
 586  * Tristate printer
 587  *
 588  * This printer is used when generating the `include/config/tristate.conf' file.
 589  */
 590 static void
 591 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 592 {
 593
 594         if (sym->type == S_TRISTATE && *value != 'n')
 595                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 596 }
 597
 598 static struct conf_printer tristate_printer_cb =
 599 {
 600         .print_symbol = tristate_print_symbol,
 601         .print_comment = kconfig_print_comment,
 602 };
 603
 604 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 605                               struct conf_printer *printer, void *printer_arg)
 606 {
 607         const char *str;
 608
 609         switch (sym->type) {
 610         case S_OTHER:
 611         case S_UNKNOWN:
 612                 break;
 613         case S_STRING:
 614                 str = sym_get_string_value(sym);
 615                 str = sym_escape_string_value(str);
 616                 printer->print_symbol(fp, sym, str, printer_arg);
 617                 free((void *)str);
 618                 break;
 619         default:
 620                 str = sym_get_string_value(sym);
 621                 printer->print_symbol(fp, sym, str, printer_arg);
 622         }
 623 }
 624
 625 static void
 626 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 627 {
 628         char buf[256];
 629
 630         snprintf(buf, sizeof(buf),
 631             "\n"
 632             "Automatically generated file; DO NOT EDIT.\n"
 633             "%s\n",
 634             rootmenu.prompt->text);
 635
 636         printer->print_comment(fp, buf, printer_arg);
 637 }
 638
 639 /*
 640  * Write out a minimal config.
 641  * All values that has default values are skipped as this is redundant.
 642  */
 643 int conf_write_defconfig(const char *filename)
 644 {
 645         struct symbol *sym;
 646         struct menu *menu;
 647         FILE *out;
 648
 649         out = fopen(filename, "w");
 650         if (!out)
 651                 return 1;
 652
 653         sym_clear_all_valid();
 654
 655         /* Traverse all menus to find all relevant symbols */
 656         menu = rootmenu.list;
 657
 658         while (menu != NULL)
 659         {
 660                 sym = menu->sym;
 661                 if (sym == NULL) {
 662                         if (!menu_is_visible(menu))
 663                                 goto next_menu;
 664                 } else if (!sym_is_choice(sym)) {
 665                         sym_calc_value(sym);
 666                         if (!(sym->flags & SYMBOL_WRITE))
 667                                 goto next_menu;
 668                         sym->flags &= ~SYMBOL_WRITE;
 669                         /* If we cannot change the symbol - skip */
 670                         if (!sym_is_changable(sym))
 671                                 goto next_menu;
 672                         /* If symbol equals to default value - skip */
 673                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 674                                 goto next_menu;
 675
 676                         /*
 677                          * If symbol is a choice value and equals to the
 678                          * default for a choice - skip.
 679                          * But only if value is bool and equal to "y" and
 680                          * choice is not "optional".
 681                          * (If choice is "optional" then all values can be "n")
 682                          */
 683                         if (sym_is_choice_value(sym)) {
 684                                 struct symbol *cs;
 685                                 struct symbol *ds;
 686
 687                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 688                                 ds = sym_choice_default(cs);
 689                                 if (!sym_is_optional(cs) && sym == ds) {
 690                                         if ((sym->type == S_BOOLEAN) &&
 691                                             sym_get_tristate_value(sym) == yes)
 692                                                 goto next_menu;
 693                                 }
 694                         }
 695                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 696                 }
 697 next_menu:
 698                 if (menu->list != NULL) {
 699                         menu = menu->list;
 700                 }
 701                 else if (menu->next != NULL) {
 702                         menu = menu->next;
 703                 } else {
 704                         while ((menu = menu->parent)) {
 705                                 if (menu->next != NULL) {
 706                                         menu = menu->next;
 707                                         break;
 708                                 }
 709                         }
 710                 }
 711         }
 712         fclose(out);
 713         return 0;
 714 }
 715
 716 int conf_write(const char *name)
 717 {
 718         FILE *out;
 719         struct symbol *sym;
 720         struct menu *menu;
 721         const char *basename;
 722         const char *str;
 723         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 724         char *env;
 725
 726         dirname[0] = 0;
 727         if (name && name[0]) {
 728                 struct stat st;
 729                 char *slash;
 730
 731                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 732                         strcpy(dirname, name);
 733                         strcat(dirname, "/");
 734                         basename = conf_get_configname();
 735                 } else if ((slash = strrchr(name, '/'))) {
 736                         int size = slash - name + 1;
 737                         memcpy(dirname, name, size);
 738                         dirname[size] = 0;
 739                         if (slash[1])
 740                                 basename = slash + 1;
 741                         else
 742                                 basename = conf_get_configname();
 743                 } else
 744                         basename = name;
 745         } else
 746                 basename = conf_get_configname();
 747
 748         sprintf(newname, "%s%s", dirname, basename);
 749         env = getenv("KCONFIG_OVERWRITECONFIG");
 750         if (!env || !*env) {
 751                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 752                 out = fopen(tmpname, "w");
 753         } else {
 754                 *tmpname = 0;
 755                 out = fopen(newname, "w");
 756         }
 757         if (!out)
 758                 return 1;
 759
 760         conf_write_heading(out, &kconfig_printer_cb, NULL);
 761
 762         if (!conf_get_changed())
 763                 sym_clear_all_valid();
 764
 765         menu = rootmenu.list;
 766         while (menu) {
 767                 sym = menu->sym;
 768                 if (!sym) {
 769                         if (!menu_is_visible(menu))
 770                                 goto next;
 771                         str = menu_get_prompt(menu);
 772                         fprintf(out, "\n"
 773                                      "#\n"
 774                                      "# %s\n"
 775                                      "#\n", str);
 776                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 777                         sym_calc_value(sym);
 778                         if (!(sym->flags & SYMBOL_WRITE))
 779                                 goto next;
 780                         sym->flags &= ~SYMBOL_WRITE;
 781
 782                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 783                 }
 784
 785 next:
 786                 if (menu->list) {
 787                         menu = menu->list;
 788                         continue;
 789                 }
 790                 if (menu->next)
 791                         menu = menu->next;
 792                 else while ((menu = menu->parent)) {
 793                         if (menu->next) {
 794                                 menu = menu->next;
 795                                 break;
 796                         }
 797                 }
 798         }
 799         fclose(out);
 800
 801         if (*tmpname) {
 802                 strcat(dirname, basename);
 803                 strcat(dirname, ".old");
 804                 rename(newname, dirname);
 805                 if (rename(tmpname, newname))
 806                         return 1;
 807         }
 808
 809         conf_message(_("configuration written to %s"), newname);
 810
 811         sym_set_change_count(0);
 812
 813         return 0;
 814 }
 815
 816 static int conf_split_config(void)
 817 {
 818         const char *name;
 819         char path[PATH_MAX+1];
 820         char *s, *d, c;
 821         struct symbol *sym;
 822         struct stat sb;
 823         int res, i, fd;
 824
 825         name = conf_get_autoconfig_name();
 826         conf_read_simple(name, S_DEF_AUTO);
 827
 828         if (chdir("include/config"))
 829                 return 1;
 830
 831         res = 0;
 832         for_all_symbols(i, sym) {
 833                 sym_calc_value(sym);
 834                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 835                         continue;
 836                 if (sym->flags & SYMBOL_WRITE) {
 837                         if (sym->flags & SYMBOL_DEF_AUTO) {
 838                                 /*
 839                                  * symbol has old and new value,
 840                                  * so compare them...
 841                                  */
 842                                 switch (sym->type) {
 843                                 case S_BOOLEAN:
 844                                 case S_TRISTATE:
 845                                         if (sym_get_tristate_value(sym) ==
 846                                             sym->def[S_DEF_AUTO].tri)
 847                                                 continue;
 848                                         break;
 849                                 case S_STRING:
 850                                 case S_HEX:
 851                                 case S_INT:
 852                                         if (!strcmp(sym_get_string_value(sym),
 853                                                     sym->def[S_DEF_AUTO].val))
 854                                                 continue;
 855                                         break;
 856                                 default:
 857                                         break;
 858                                 }
 859                         } else {
 860                                 /*
 861                                  * If there is no old value, only 'no' (unset)
 862                                  * is allowed as new value.
 863                                  */
 864                                 switch (sym->type) {
 865                                 case S_BOOLEAN:
 866                                 case S_TRISTATE:
 867                                         if (sym_get_tristate_value(sym) == no)
 868                                                 continue;
 869                                         break;
 870                                 default:
 871                                         break;
 872                                 }
 873                         }
 874                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 875                         /* There is neither an old nor a new value. */
 876                         continue;
 877                 /* else
 878                  *      There is an old value, but no new value ('no' (unset)
 879                  *      isn't saved in auto.conf, so the old value is always
 880                  *      different from 'no').
 881                  */
 882
 883                 /* Replace all '_' and append ".h" */
 884                 s = sym->name;
 885                 d = path;
 886                 while ((c = *s++)) {
 887                         c = tolower(c);
 888                         *d++ = (c == '_') ? '/' : c;
 889                 }
 890                 strcpy(d, ".h");
 891
 892                 /* Assume directory path already exists. */
 893                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 894                 if (fd == -1) {
 895                         if (errno != ENOENT) {
 896                                 res = 1;
 897                                 break;
 898                         }
 899                         /*
 900                          * Create directory components,
 901                          * unless they exist already.
 902                          */
 903                         d = path;
 904                         while ((d = strchr(d, '/'))) {
 905                                 *d = 0;
 906                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 907                                         res = 1;
 908                                         goto out;
 909                                 }
 910                                 *d++ = '/';
 911                         }
 912                         /* Try it again. */
 913                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 914                         if (fd == -1) {
 915                                 res = 1;
 916                                 break;
 917                         }
 918                 }
 919                 close(fd);
 920         }
 921 out:
 922         if (chdir("../.."))
 923                 return 1;
 924
 925         return res;
 926 }
 927
 928 int conf_write_autoconf(void)
 929 {
 930         struct symbol *sym;
 931         const char *name;
 932         FILE *out, *tristate, *out_h;
 933         int i;
 934
 935         sym_clear_all_valid();
 936
 937         file_write_dep("include/config/auto.conf.cmd");
 938
 939         if (conf_split_config())
 940                 return 1;
 941
 942         out = fopen(".tmpconfig", "w");
 943         if (!out)
 944                 return 1;
 945
 946         tristate = fopen(".tmpconfig_tristate", "w");
 947         if (!tristate) {
 948                 fclose(out);
 949                 return 1;
 950         }
 951
 952         out_h = fopen(".tmpconfig.h", "w");
 953         if (!out_h) {
 954                 fclose(out);
 955                 fclose(tristate);
 956                 return 1;
 957         }
 958
 959         conf_write_heading(out, &kconfig_printer_cb, NULL);
 960
 961         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 962
 963         conf_write_heading(out_h, &header_printer_cb, NULL);
 964
 965         for_all_symbols(i, sym) {
 966                 if (!sym->name)
 967                         continue;
 968
 969                 sym_calc_value(sym);
 970
 971                 conf_write_symbol(out_h, sym, &header__enabled_printer_cb, NULL);
 972
 973                 if (!(sym->flags & SYMBOL_WRITE))
 974                         continue;
 975
 976                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 977
 978                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 979
 980                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 981         }
 982         fclose(out);
 983         fclose(tristate);
 984         fclose(out_h);
 985
 986         name = getenv("KCONFIG_AUTOHEADER");
 987         if (!name)
 988                 name = "include/generated/autoconf.h";
 989         if (rename(".tmpconfig.h", name))
 990                 return 1;
 991         name = getenv("KCONFIG_TRISTATE");
 992         if (!name)
 993                 name = "include/config/tristate.conf";
 994         if (rename(".tmpconfig_tristate", name))
 995                 return 1;
 996         name = conf_get_autoconfig_name();
 997         /*
 998          * This must be the last step, kbuild has a dependency on auto.conf
 999          * and this marks the successful completion of the previous steps.
1000          */
1001         if (rename(".tmpconfig", name))
1002                 return 1;
1003
1004         return 0;
1005 }
1006
1007 static int sym_change_count;
1008 static void (*conf_changed_callback)(void);
1009
1010 void sym_set_change_count(int count)
1011 {
1012         int _sym_change_count = sym_change_count;
1013         sym_change_count = count;
1014         if (conf_changed_callback &&
1015             (bool)_sym_change_count != (bool)count)
1016                 conf_changed_callback();
1017 }
1018
1019 void sym_add_change_count(int count)
1020 {
1021         sym_set_change_count(count + sym_change_count);
1022 }
1023
1024 bool conf_get_changed(void)
1025 {
1026         return sym_change_count;
1027 }
1028
1029 void conf_set_changed_callback(void (*fn)(void))
1030 {
1031         conf_changed_callback = fn;
1032 }
1033
1034 static void randomize_choice_values(struct symbol *csym)
1035 {
1036         struct property *prop;
1037         struct symbol *sym;
1038         struct expr *e;
1039         int cnt, def;
1040
1041         /*
1042          * If choice is mod then we may have more items selected
1043          * and if no then no-one.
1044          * In both cases stop.
1045          */
1046         if (csym->curr.tri != yes)
1047                 return;
1048
1049         prop = sym_get_choice_prop(csym);
1050
1051         /* count entries in choice block */
1052         cnt = 0;
1053         expr_list_for_each_sym(prop->expr, e, sym)
1054                 cnt++;
1055
1056         /*
1057          * find a random value and set it to yes,
1058          * set the rest to no so we have only one set
1059          */
1060         def = (rand() % cnt);
1061
1062         cnt = 0;
1063         expr_list_for_each_sym(prop->expr, e, sym) {
1064                 if (def == cnt++) {
1065                         sym->def[S_DEF_USER].tri = yes;
1066                         csym->def[S_DEF_USER].val = sym;
1067                 }
1068                 else {
1069                         sym->def[S_DEF_USER].tri = no;
1070                 }
1071         }
1072         csym->flags |= SYMBOL_DEF_USER;
1073         /* clear VALID to get value calculated */
1074         csym->flags &= ~(SYMBOL_VALID);
1075 }
1076
1077 static void set_all_choice_values(struct symbol *csym)
1078 {
1079         struct property *prop;
1080         struct symbol *sym;
1081         struct expr *e;
1082
1083         prop = sym_get_choice_prop(csym);
1084
1085         /*
1086          * Set all non-assinged choice values to no
1087          */
1088         expr_list_for_each_sym(prop->expr, e, sym) {
1089                 if (!sym_has_value(sym))
1090                         sym->def[S_DEF_USER].tri = no;
1091         }
1092         csym->flags |= SYMBOL_DEF_USER;
1093         /* clear VALID to get value calculated */
1094         csym->flags &= ~(SYMBOL_VALID);
1095 }
1096
1097 void conf_set_all_new_symbols(enum conf_def_mode mode)
1098 {
1099         struct symbol *sym, *csym;
1100         int i, cnt;
1101
1102         for_all_symbols(i, sym) {
1103                 if (sym_has_value(sym))
1104                         continue;
1105                 switch (sym_get_type(sym)) {
1106                 case S_BOOLEAN:
1107                 case S_TRISTATE:
1108                         switch (mode) {
1109                         case def_yes:
1110                                 sym->def[S_DEF_USER].tri = yes;
1111                                 break;
1112                         case def_mod:
1113                                 sym->def[S_DEF_USER].tri = mod;
1114                                 break;
1115                         case def_no:
1116                                 sym->def[S_DEF_USER].tri = no;
1117                                 break;
1118                         case def_random:
1119                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1120                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1121                                 break;
1122                         default:
1123                                 continue;
1124                         }
1125                         if (!(sym_is_choice(sym) && mode == def_random))
1126                                 sym->flags |= SYMBOL_DEF_USER;
1127                         break;
1128                 default:
1129                         break;
1130                 }
1131
1132         }
1133
1134         sym_clear_all_valid();
1135
1136         /*
1137          * We have different type of choice blocks.
1138          * If curr.tri equals to mod then we can select several
1139          * choice symbols in one block.
1140          * In this case we do nothing.
1141          * If curr.tri equals yes then only one symbol can be
1142          * selected in a choice block and we set it to yes,
1143          * and the rest to no.
1144          */
1145         for_all_symbols(i, csym) {
1146                 if (sym_has_value(csym) || !sym_is_choice(csym))
1147                         continue;
1148
1149                 sym_calc_value(csym);
1150                 if (mode == def_random)
1151                         randomize_choice_values(csym);
1152                 else
1153                         set_all_choice_values(csym);
1154         }
1155 }