config/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <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[] = "include/generated/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/generated/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_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 458 {
 459
 460         switch (sym->type) {
 461         case S_BOOLEAN:
 462         case S_TRISTATE:
 463                 if (*value == 'n') {
 464                         bool skip_unset = (arg != NULL);
 465
 466                         if (!skip_unset)
 467                                 fprintf(fp, "set(%s%s false)\n",
 468                                         CONFIG_, sym->name, value);
 469                         return;
 470                 } else if (*value == 'm') {
 471                         abort();
 472                 } else {
 473                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 474                 }
 475                 break;
 476         case S_HEX: {
 477                 const char *prefix = "";
 478
 479                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 480                         prefix = "0x";
 481                 fprintf(fp, "set(%s%s %s%s)\n",
 482                     CONFIG_, sym->name, prefix, value);
 483                 break;
 484         }
 485         case S_STRING:
 486         case S_INT:
 487                 fprintf(fp, "set(%s%s %s)\n",
 488                     CONFIG_, sym->name, value);
 489                 break;
 490         default:
 491                 break;
 492         }
 493
 494 }
 495
 496 static void
 497 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 498 {
 499         const char *p = value;
 500         size_t l;
 501
 502         for (;;) {
 503                 l = strcspn(p, "\n");
 504                 fprintf(fp, "#");
 505                 if (l) {
 506                         fprintf(fp, " ");
 507                         fwrite(p, l, 1, fp);
 508                         p += l;
 509                 }
 510                 fprintf(fp, "\n");
 511                 if (*p++ == '\0')
 512                         break;
 513         }
 514 }
 515
 516 static struct conf_printer kconfig_printer_cb =
 517 {
 518         .print_symbol = kconfig_print_symbol,
 519         .print_comment = kconfig_print_comment,
 520 };
 521
 522 static struct conf_printer kconfig_printer_cmake_cb =
 523 {
 524         .print_symbol = kconfig_print_cmake_symbol,
 525         .print_comment = kconfig_print_comment,
 526 };
 527
 528 /*
 529  * Header printer
 530  *
 531  * This printer is used when generating the `include/generated/autoconf.h' file.
 532  */
 533 static void
 534 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 535 {
 536
 537         switch (sym->type) {
 538         case S_BOOLEAN:
 539         case S_TRISTATE: {
 540                 const char *suffix = "";
 541
 542                 switch (*value) {
 543                 case 'n':
 544                         break;
 545                 case 'm':
 546                         suffix = "_MODULE";
 547                         /* fall through */
 548                 default:
 549                         fprintf(fp, "#define %s%s%s 1\n",
 550                             CONFIG_, sym->name, suffix);
 551                 }
 552                 break;
 553         }
 554         case S_HEX: {
 555                 const char *prefix = "";
 556
 557                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 558                         prefix = "0x";
 559                 fprintf(fp, "#define %s%s %s%s\n",
 560                     CONFIG_, sym->name, prefix, value);
 561                 break;
 562         }
 563         case S_STRING:
 564         case S_INT:
 565                 fprintf(fp, "#define %s%s %s\n",
 566                     CONFIG_, sym->name, value);
 567                 break;
 568         default:
 569                 break;
 570         }
 571
 572 }
 573
 574 static void
 575 header_print_comment(FILE *fp, const char *value, void *arg)
 576 {
 577         const char *p = value;
 578         size_t l;
 579
 580         fprintf(fp, "/*\n");
 581         for (;;) {
 582                 l = strcspn(p, "\n");
 583                 fprintf(fp, " *");
 584                 if (l) {
 585                         fprintf(fp, " ");
 586                         fwrite(p, l, 1, fp);
 587                         p += l;
 588                 }
 589                 fprintf(fp, "\n");
 590                 if (*p++ == '\0')
 591                         break;
 592         }
 593         fprintf(fp, " */\n");
 594 }
 595
 596 static struct conf_printer header_printer_cb =
 597 {
 598         .print_symbol = header_print_symbol,
 599         .print_comment = header_print_comment,
 600 };
 601
 602 /*
 603  * Generate the __enabled_CONFIG_* and __enabled_CONFIG_*_MODULE macros for
 604  * use by the IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
 605  * generated even for booleans so that the IS_ENABLED() macro works.
 606  */
 607 static void
 608 header_print__enabled_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 609 {
 610
 611         switch (sym->type) {
 612         case S_BOOLEAN:
 613         case S_TRISTATE: {
 614                 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
 615                     sym->name, (*value == 'y'));
 616                 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
 617                     sym->name, (*value == 'm'));
 618                 break;
 619         }
 620         default:
 621                 break;
 622         }
 623 }
 624
 625 static struct conf_printer header__enabled_printer_cb =
 626 {
 627         .print_symbol = header_print__enabled_symbol,
 628         .print_comment = header_print_comment,
 629 };
 630
 631 /*
 632  * Tristate printer
 633  *
 634  * This printer is used when generating the `include/generated/tristate.conf' file.
 635  */
 636 static void
 637 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 638 {
 639
 640         if (sym->type == S_TRISTATE && *value != 'n')
 641                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 642 }
 643
 644 static struct conf_printer tristate_printer_cb =
 645 {
 646         .print_symbol = tristate_print_symbol,
 647         .print_comment = kconfig_print_comment,
 648 };
 649
 650 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 651                               struct conf_printer *printer, void *printer_arg)
 652 {
 653         const char *str;
 654
 655         switch (sym->type) {
 656         case S_OTHER:
 657         case S_UNKNOWN:
 658                 break;
 659         case S_STRING:
 660                 str = sym_get_string_value(sym);
 661                 str = sym_escape_string_value(str);
 662                 printer->print_symbol(fp, sym, str, printer_arg);
 663                 free((void *)str);
 664                 break;
 665         default:
 666                 str = sym_get_string_value(sym);
 667                 printer->print_symbol(fp, sym, str, printer_arg);
 668         }
 669 }
 670
 671 static void
 672 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 673 {
 674         char buf[256];
 675
 676         snprintf(buf, sizeof(buf),
 677             "\n"
 678             "Automatically generated file; DO NOT EDIT.\n"
 679             "%s\n",
 680             rootmenu.prompt->text);
 681
 682         printer->print_comment(fp, buf, printer_arg);
 683 }
 684
 685 /*
 686  * Write out a minimal config.
 687  * All values that has default values are skipped as this is redundant.
 688  */
 689 int conf_write_defconfig(const char *filename)
 690 {
 691         struct symbol *sym;
 692         struct menu *menu;
 693         FILE *out;
 694
 695         out = fopen(filename, "w");
 696         if (!out)
 697                 return 1;
 698
 699         sym_clear_all_valid();
 700
 701         /* Traverse all menus to find all relevant symbols */
 702         menu = rootmenu.list;
 703
 704         while (menu != NULL)
 705         {
 706                 sym = menu->sym;
 707                 if (sym == NULL) {
 708                         if (!menu_is_visible(menu))
 709                                 goto next_menu;
 710                 } else if (!sym_is_choice(sym)) {
 711                         sym_calc_value(sym);
 712                         if (!(sym->flags & SYMBOL_WRITE))
 713                                 goto next_menu;
 714                         sym->flags &= ~SYMBOL_WRITE;
 715                         /* If we cannot change the symbol - skip */
 716                         if (!sym_is_changable(sym))
 717                                 goto next_menu;
 718                         /* If symbol equals to default value - skip */
 719                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 720                                 goto next_menu;
 721
 722                         /*
 723                          * If symbol is a choice value and equals to the
 724                          * default for a choice - skip.
 725                          * But only if value is bool and equal to "y" and
 726                          * choice is not "optional".
 727                          * (If choice is "optional" then all values can be "n")
 728                          */
 729                         if (sym_is_choice_value(sym)) {
 730                                 struct symbol *cs;
 731                                 struct symbol *ds;
 732
 733                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 734                                 ds = sym_choice_default(cs);
 735                                 if (!sym_is_optional(cs) && sym == ds) {
 736                                         if ((sym->type == S_BOOLEAN) &&
 737                                             sym_get_tristate_value(sym) == yes)
 738                                                 goto next_menu;
 739                                 }
 740                         }
 741                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 742                 }
 743 next_menu:
 744                 if (menu->list != NULL) {
 745                         menu = menu->list;
 746                 }
 747                 else if (menu->next != NULL) {
 748                         menu = menu->next;
 749                 } else {
 750                         while ((menu = menu->parent)) {
 751                                 if (menu->next != NULL) {
 752                                         menu = menu->next;
 753                                         break;
 754                                 }
 755                         }
 756                 }
 757         }
 758         fclose(out);
 759         return 0;
 760 }
 761
 762 int conf_write(const char *name)
 763 {
 764         FILE *out;
 765         struct symbol *sym;
 766         struct menu *menu;
 767         const char *basename;
 768         const char *str;
 769         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 770         char *env;
 771
 772         dirname[0] = 0;
 773         if (name && name[0]) {
 774                 struct stat st;
 775                 char *slash;
 776
 777                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 778                         strcpy(dirname, name);
 779                         strcat(dirname, "/");
 780                         basename = conf_get_configname();
 781                 } else if ((slash = strrchr(name, '/'))) {
 782                         int size = slash - name + 1;
 783                         memcpy(dirname, name, size);
 784                         dirname[size] = 0;
 785                         if (slash[1])
 786                                 basename = slash + 1;
 787                         else
 788                                 basename = conf_get_configname();
 789                 } else
 790                         basename = name;
 791         } else
 792                 basename = conf_get_configname();
 793
 794         sprintf(newname, "%s%s", dirname, basename);
 795         env = getenv("KCONFIG_OVERWRITECONFIG");
 796         if (!env || !*env) {
 797                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 798                 out = fopen(tmpname, "w");
 799         } else {
 800                 *tmpname = 0;
 801                 out = fopen(newname, "w");
 802         }
 803         if (!out)
 804                 return 1;
 805
 806         conf_write_heading(out, &kconfig_printer_cb, NULL);
 807
 808         if (!conf_get_changed())
 809                 sym_clear_all_valid();
 810
 811         menu = rootmenu.list;
 812         while (menu) {
 813                 sym = menu->sym;
 814                 if (!sym) {
 815                         if (!menu_is_visible(menu))
 816                                 goto next;
 817                         str = menu_get_prompt(menu);
 818                         fprintf(out, "\n"
 819                                      "#\n"
 820                                      "# %s\n"
 821                                      "#\n", str);
 822                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 823                         sym_calc_value(sym);
 824                         if (!(sym->flags & SYMBOL_WRITE))
 825                                 goto next;
 826                         sym->flags &= ~SYMBOL_WRITE;
 827
 828                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 829                 }
 830
 831 next:
 832                 if (menu->list) {
 833                         menu = menu->list;
 834                         continue;
 835                 }
 836                 if (menu->next)
 837                         menu = menu->next;
 838                 else while ((menu = menu->parent)) {
 839                         if (menu->next) {
 840                                 menu = menu->next;
 841                                 break;
 842                         }
 843                 }
 844         }
 845         fclose(out);
 846
 847         if (*tmpname) {
 848                 strcat(dirname, basename);
 849                 strcat(dirname, ".old");
 850                 rename(newname, dirname);
 851                 if (rename(tmpname, newname))
 852                         return 1;
 853         }
 854
 855         conf_message(_("configuration written to %s"), newname);
 856
 857         sym_set_change_count(0);
 858
 859         return 0;
 860 }
 861
 862 static int conf_split_config(void)
 863 {
 864         const char *name;
 865         char path[PATH_MAX+1];
 866         char *s, *d, c;
 867         struct symbol *sym;
 868         struct stat sb;
 869         int res, i, fd;
 870
 871         name = conf_get_autoconfig_name();
 872         conf_read_simple(name, S_DEF_AUTO);
 873
 874         if (chdir("include/generated"))
 875                 return 1;
 876
 877         res = 0;
 878         for_all_symbols(i, sym) {
 879                 sym_calc_value(sym);
 880                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 881                         continue;
 882                 if (sym->flags & SYMBOL_WRITE) {
 883                         if (sym->flags & SYMBOL_DEF_AUTO) {
 884                                 /*
 885                                  * symbol has old and new value,
 886                                  * so compare them...
 887                                  */
 888                                 switch (sym->type) {
 889                                 case S_BOOLEAN:
 890                                 case S_TRISTATE:
 891                                         if (sym_get_tristate_value(sym) ==
 892                                             sym->def[S_DEF_AUTO].tri)
 893                                                 continue;
 894                                         break;
 895                                 case S_STRING:
 896                                 case S_HEX:
 897                                 case S_INT:
 898                                         if (!strcmp(sym_get_string_value(sym),
 899                                                     sym->def[S_DEF_AUTO].val))
 900                                                 continue;
 901                                         break;
 902                                 default:
 903                                         break;
 904                                 }
 905                         } else {
 906                                 /*
 907                                  * If there is no old value, only 'no' (unset)
 908                                  * is allowed as new value.
 909                                  */
 910                                 switch (sym->type) {
 911                                 case S_BOOLEAN:
 912                                 case S_TRISTATE:
 913                                         if (sym_get_tristate_value(sym) == no)
 914                                                 continue;
 915                                         break;
 916                                 default:
 917                                         break;
 918                                 }
 919                         }
 920                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 921                         /* There is neither an old nor a new value. */
 922                         continue;
 923                 /* else
 924                  *      There is an old value, but no new value ('no' (unset)
 925                  *      isn't saved in auto.conf, so the old value is always
 926                  *      different from 'no').
 927                  */
 928
 929                 /* Replace all '_' and append ".h" */
 930                 s = sym->name;
 931                 d = path;
 932                 while ((c = *s++)) {
 933                         c = tolower(c);
 934                         *d++ = (c == '_') ? '/' : c;
 935                 }
 936                 strcpy(d, ".h");
 937
 938                 /* Assume directory path already exists. */
 939                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 940                 if (fd == -1) {
 941                         if (errno != ENOENT) {
 942                                 res = 1;
 943                                 break;
 944                         }
 945                         /*
 946                          * Create directory components,
 947                          * unless they exist already.
 948                          */
 949                         d = path;
 950                         while ((d = strchr(d, '/'))) {
 951                                 *d = 0;
 952                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 953                                         res = 1;
 954                                         goto out;
 955                                 }
 956                                 *d++ = '/';
 957                         }
 958                         /* Try it again. */
 959                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 960                         if (fd == -1) {
 961                                 res = 1;
 962                                 break;
 963                         }
 964                 }
 965                 close(fd);
 966         }
 967 out:
 968         if (chdir("../.."))
 969                 return 1;
 970
 971         return res;
 972 }
 973
 974 int conf_write_autoconf(void)
 975 {
 976         struct symbol *sym;
 977         const char *name;
 978         FILE *out, *tristate, *out_h, *out_c;
 979         int i;
 980
 981         sym_clear_all_valid();
 982
 983         file_write_dep("include/generated/auto.conf.cmd");
 984
 985         if (conf_split_config())
 986                 return 1;
 987
 988         out = fopen(".tmpconfig", "w");
 989         if (!out)
 990                 return 1;
 991
 992         tristate = fopen(".tmpconfig_tristate", "w");
 993         if (!tristate) {
 994                 fclose(out);
 995                 return 1;
 996         }
 997
 998         out_h = fopen(".tmpconfig.h", "w");
 999         if (!out_h) {
1000                 fclose(out);
1001                 fclose(tristate);
1002                 return 1;
1003         }
1004
1005         out_c = fopen(".tmpconfig.cmake", "w");
1006         if (!out_c) {
1007                 fclose(out);
1008                 fclose(tristate);
1009                 fclose(out_h);
1010         }
1011
1012         conf_write_heading(out, &kconfig_printer_cb, NULL);
1013
1014         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1015
1016         conf_write_heading(out_h, &header_printer_cb, NULL);
1017
1018         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1019
1020         for_all_symbols(i, sym) {
1021                 if (!sym->name)
1022                         continue;
1023
1024                 sym_calc_value(sym);
1025
1026                 conf_write_symbol(out_h, sym, &header__enabled_printer_cb, NULL);
1027
1028                 if (!(sym->flags & SYMBOL_WRITE))
1029                         continue;
1030
1031                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1032
1033                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1034
1035                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1036
1037                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1038         }
1039         fclose(out);
1040         fclose(tristate);
1041         fclose(out_h);
1042         fclose(out_c);
1043
1044         name = getenv("KCONFIG_AUTOHEADER");
1045         if (!name)
1046                 name = "include/generated/autoconf.h";
1047         if (rename(".tmpconfig.h", name))
1048                 return 1;
1049         name = getenv("KCONFIG_TRISTATE");
1050         if (!name)
1051                 name = "include/generated/tristate.conf";
1052         if (rename(".tmpconfig_tristate", name))
1053                 return 1;
1054         name = getenv("KCONFIG_CMAKE");
1055         if (!name)
1056                 name = "config.cmake";
1057         if (rename(".tmpconfig.cmake", name))
1058                 return 1;
1059         name = conf_get_autoconfig_name();
1060         /*
1061          * This must be the last step, kbuild has a dependency on auto.conf
1062          * and this marks the successful completion of the previous steps.
1063          */
1064         if (rename(".tmpconfig", name))
1065                 return 1;
1066
1067         return 0;
1068 }
1069
1070 static int sym_change_count;
1071 static void (*conf_changed_callback)(void);
1072
1073 void sym_set_change_count(int count)
1074 {
1075         int _sym_change_count = sym_change_count;
1076         sym_change_count = count;
1077         if (conf_changed_callback &&
1078             (bool)_sym_change_count != (bool)count)
1079                 conf_changed_callback();
1080 }
1081
1082 void sym_add_change_count(int count)
1083 {
1084         sym_set_change_count(count + sym_change_count);
1085 }
1086
1087 bool conf_get_changed(void)
1088 {
1089         return sym_change_count;
1090 }
1091
1092 void conf_set_changed_callback(void (*fn)(void))
1093 {
1094         conf_changed_callback = fn;
1095 }
1096
1097 static void randomize_choice_values(struct symbol *csym)
1098 {
1099         struct property *prop;
1100         struct symbol *sym;
1101         struct expr *e;
1102         int cnt, def;
1103
1104         /*
1105          * If choice is mod then we may have more items selected
1106          * and if no then no-one.
1107          * In both cases stop.
1108          */
1109         if (csym->curr.tri != yes)
1110                 return;
1111
1112         prop = sym_get_choice_prop(csym);
1113
1114         /* count entries in choice block */
1115         cnt = 0;
1116         expr_list_for_each_sym(prop->expr, e, sym)
1117                 cnt++;
1118
1119         /*
1120          * find a random value and set it to yes,
1121          * set the rest to no so we have only one set
1122          */
1123         def = (rand() % cnt);
1124
1125         cnt = 0;
1126         expr_list_for_each_sym(prop->expr, e, sym) {
1127                 if (def == cnt++) {
1128                         sym->def[S_DEF_USER].tri = yes;
1129                         csym->def[S_DEF_USER].val = sym;
1130                 }
1131                 else {
1132                         sym->def[S_DEF_USER].tri = no;
1133                 }
1134         }
1135         csym->flags |= SYMBOL_DEF_USER;
1136         /* clear VALID to get value calculated */
1137         csym->flags &= ~(SYMBOL_VALID);
1138 }
1139
1140 static void set_all_choice_values(struct symbol *csym)
1141 {
1142         struct property *prop;
1143         struct symbol *sym;
1144         struct expr *e;
1145
1146         prop = sym_get_choice_prop(csym);
1147
1148         /*
1149          * Set all non-assinged choice values to no
1150          */
1151         expr_list_for_each_sym(prop->expr, e, sym) {
1152                 if (!sym_has_value(sym))
1153                         sym->def[S_DEF_USER].tri = no;
1154         }
1155         csym->flags |= SYMBOL_DEF_USER;
1156         /* clear VALID to get value calculated */
1157         csym->flags &= ~(SYMBOL_VALID);
1158 }
1159
1160 void conf_set_all_new_symbols(enum conf_def_mode mode)
1161 {
1162         struct symbol *sym, *csym;
1163         int i, cnt;
1164
1165         for_all_symbols(i, sym) {
1166                 if (sym_has_value(sym))
1167                         continue;
1168                 switch (sym_get_type(sym)) {
1169                 case S_BOOLEAN:
1170                 case S_TRISTATE:
1171                         switch (mode) {
1172                         case def_yes:
1173                                 sym->def[S_DEF_USER].tri = yes;
1174                                 break;
1175                         case def_mod:
1176                                 sym->def[S_DEF_USER].tri = mod;
1177                                 break;
1178                         case def_no:
1179                                 sym->def[S_DEF_USER].tri = no;
1180                                 break;
1181                         case def_random:
1182                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1183                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1184                                 break;
1185                         default:
1186                                 continue;
1187                         }
1188                         if (!(sym_is_choice(sym) && mode == def_random))
1189                                 sym->flags |= SYMBOL_DEF_USER;
1190                         break;
1191                 default:
1192                         break;
1193                 }
1194
1195         }
1196
1197         sym_clear_all_valid();
1198
1199         /*
1200          * We have different type of choice blocks.
1201          * If curr.tri equals to mod then we can select several
1202          * choice symbols in one block.
1203          * In this case we do nothing.
1204          * If curr.tri equals yes then only one symbol can be
1205          * selected in a choice block and we set it to yes,
1206          * and the rest to no.
1207          */
1208         for_all_symbols(i, csym) {
1209                 if (sym_has_value(csym) || !sym_is_choice(csym))
1210                         continue;
1211
1212                 sym_calc_value(csym);
1213                 if (mode == def_random)
1214                         randomize_choice_values(csym);
1215                 else
1216                         set_all_choice_values(csym);
1217         }
1218 }