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