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 struct conf_printer {
  20         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
  21         void (*print_comment)(FILE *, const char *, void *);
  22 };
  23
  24 static void conf_warning(const char *fmt, ...)
  25         __attribute__ ((format (printf, 1, 2)));
  26
  27 static void conf_message(const char *fmt, ...)
  28         __attribute__ ((format (printf, 1, 2)));
  29
  30 static const char *conf_filename;
  31 static int conf_lineno, conf_warnings;
  32
  33 const char conf_defname[] = "arch/$(ARCH)/defconfig";
  34
  35 static void conf_warning(const char *fmt, ...)
  36 {
  37         va_list ap;
  38         va_start(ap, fmt);
  39         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  40         vfprintf(stderr, fmt, ap);
  41         fprintf(stderr, "\n");
  42         va_end(ap);
  43         conf_warnings++;
  44 }
  45
  46 static void conf_default_message_callback(const char *fmt, va_list ap)
  47 {
  48         printf("#\n# ");
  49         vprintf(fmt, ap);
  50         printf("\n#\n");
  51 }
  52
  53 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  54         conf_default_message_callback;
  55 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  56 {
  57         conf_message_callback = fn;
  58 }
  59
  60 static void conf_message(const char *fmt, ...)
  61 {
  62         va_list ap;
  63
  64         va_start(ap, fmt);
  65         if (conf_message_callback)
  66                 conf_message_callback(fmt, ap);
  67         va_end(ap);
  68 }
  69
  70 const char *conf_get_configname(void)
  71 {
  72         char *name = getenv("KCONFIG_CONFIG");
  73
  74         return name ? name : ".config";
  75 }
  76
  77 const char *conf_get_autoconfig_name(void)
  78 {
  79         char *name = getenv("KCONFIG_AUTOCONFIG");
  80
  81         return name ? name : "include/config/auto.conf";
  82 }
  83
  84 char *conf_get_default_confname(void)
  85 {
  86         struct stat buf;
  87         static char fullname[PATH_MAX+1];
  88         char *env, *name;
  89
  90         name = expand_string(conf_defname);
  91         env = getenv(SRCTREE);
  92         if (env) {
  93                 sprintf(fullname, "%s/%s", env, name);
  94                 if (!stat(fullname, &buf))
  95                         return fullname;
  96         }
  97         return name;
  98 }
  99
 100 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 101 {
 102         char *p2;
 103
 104         switch (sym->type) {
 105         case S_TRISTATE:
 106                 if (p[0] == 'm') {
 107                         sym->def[def].tri = mod;
 108                         sym->flags |= def_flags;
 109                         break;
 110                 }
 111                 /* fall through */
 112         case S_BOOLEAN:
 113                 if (p[0] == 'y') {
 114                         sym->def[def].tri = yes;
 115                         sym->flags |= def_flags;
 116                         break;
 117                 }
 118                 if (p[0] == 'n') {
 119                         sym->def[def].tri = no;
 120                         sym->flags |= def_flags;
 121                         break;
 122                 }
 123                 if (def != S_DEF_AUTO)
 124                         conf_warning("symbol value '%s' invalid for %s",
 125                                      p, sym->name);
 126                 return 1;
 127         case S_OTHER:
 128                 if (*p != '"') {
 129                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 130                                 ;
 131                         sym->type = S_STRING;
 132                         goto done;
 133                 }
 134                 /* fall through */
 135         case S_STRING:
 136                 if (*p++ != '"')
 137                         break;
 138                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 139                         if (*p2 == '"') {
 140                                 *p2 = 0;
 141                                 break;
 142                         }
 143                         memmove(p2, p2 + 1, strlen(p2));
 144                 }
 145                 if (!p2) {
 146                         if (def != S_DEF_AUTO)
 147                                 conf_warning("invalid string found");
 148                         return 1;
 149                 }
 150                 /* fall through */
 151         case S_INT:
 152         case S_HEX:
 153         done:
 154                 if (sym_string_valid(sym, p)) {
 155                         sym->def[def].val = xstrdup(p);
 156                         sym->flags |= def_flags;
 157                 } else {
 158                         if (def != S_DEF_AUTO)
 159                                 conf_warning("symbol value '%s' invalid for %s",
 160                                              p, sym->name);
 161                         return 1;
 162                 }
 163                 break;
 164         default:
 165                 ;
 166         }
 167         return 0;
 168 }
 169
 170 #define LINE_GROWTH 16
 171 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 172 {
 173         char *nline;
 174         size_t new_size = slen + 1;
 175         if (new_size > *n) {
 176                 new_size += LINE_GROWTH - 1;
 177                 new_size *= 2;
 178                 nline = xrealloc(*lineptr, new_size);
 179                 if (!nline)
 180                         return -1;
 181
 182                 *lineptr = nline;
 183                 *n = new_size;
 184         }
 185
 186         (*lineptr)[slen] = c;
 187
 188         return 0;
 189 }
 190
 191 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 192 {
 193         char *line = *lineptr;
 194         size_t slen = 0;
 195
 196         for (;;) {
 197                 int c = getc(stream);
 198
 199                 switch (c) {
 200                 case '\n':
 201                         if (add_byte(c, &line, slen, n) < 0)
 202                                 goto e_out;
 203                         slen++;
 204                         /* fall through */
 205                 case EOF:
 206                         if (add_byte('\0', &line, slen, n) < 0)
 207                                 goto e_out;
 208                         *lineptr = line;
 209                         if (slen == 0)
 210                                 return -1;
 211                         return slen;
 212                 default:
 213                         if (add_byte(c, &line, slen, n) < 0)
 214                                 goto e_out;
 215                         slen++;
 216                 }
 217         }
 218
 219 e_out:
 220         line[slen-1] = '\0';
 221         *lineptr = line;
 222         return -1;
 223 }
 224
 225 int conf_read_simple(const char *name, int def)
 226 {
 227         FILE *in = NULL;
 228         char   *line = NULL;
 229         size_t  line_asize = 0;
 230         char *p, *p2;
 231         struct symbol *sym;
 232         int i, def_flags;
 233
 234         if (name) {
 235                 in = zconf_fopen(name);
 236         } else {
 237                 struct property *prop;
 238
 239                 name = conf_get_configname();
 240                 in = zconf_fopen(name);
 241                 if (in)
 242                         goto load;
 243                 sym_add_change_count(1);
 244                 if (!sym_defconfig_list)
 245                         return 1;
 246
 247                 for_all_defaults(sym_defconfig_list, prop) {
 248                         if (expr_calc_value(prop->visible.expr) == no ||
 249                             prop->expr->type != E_SYMBOL)
 250                                 continue;
 251                         sym_calc_value(prop->expr->left.sym);
 252                         name = sym_get_string_value(prop->expr->left.sym);
 253                         in = zconf_fopen(name);
 254                         if (in) {
 255                                 conf_message("using defaults found in %s",
 256                                          name);
 257                                 goto load;
 258                         }
 259                 }
 260         }
 261         if (!in)
 262                 return 1;
 263
 264 load:
 265         conf_filename = name;
 266         conf_lineno = 0;
 267         conf_warnings = 0;
 268
 269         def_flags = SYMBOL_DEF << def;
 270         for_all_symbols(i, sym) {
 271                 sym->flags |= SYMBOL_CHANGED;
 272                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 273                 if (sym_is_choice(sym))
 274                         sym->flags |= def_flags;
 275                 switch (sym->type) {
 276                 case S_INT:
 277                 case S_HEX:
 278                 case S_STRING:
 279                         if (sym->def[def].val)
 280                                 free(sym->def[def].val);
 281                         /* fall through */
 282                 default:
 283                         sym->def[def].val = NULL;
 284                         sym->def[def].tri = no;
 285                 }
 286         }
 287
 288         while (compat_getline(&line, &line_asize, in) != -1) {
 289                 conf_lineno++;
 290                 sym = NULL;
 291                 if (line[0] == '#') {
 292                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 293                                 continue;
 294                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 295                         if (!p)
 296                                 continue;
 297                         *p++ = 0;
 298                         if (strncmp(p, "is not set", 10))
 299                                 continue;
 300                         if (def == S_DEF_USER) {
 301                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 302                                 if (!sym) {
 303                                         sym_add_change_count(1);
 304                                         goto setsym;
 305                                 }
 306                         } else {
 307                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 308                                 if (sym->type == S_UNKNOWN)
 309                                         sym->type = S_BOOLEAN;
 310                         }
 311                         if (sym->flags & def_flags) {
 312                                 conf_warning("override: reassigning to symbol %s", sym->name);
 313                         }
 314                         switch (sym->type) {
 315                         case S_BOOLEAN:
 316                         case S_TRISTATE:
 317                                 sym->def[def].tri = no;
 318                                 sym->flags |= def_flags;
 319                                 break;
 320                         default:
 321                                 ;
 322                         }
 323                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 324                         p = strchr(line + strlen(CONFIG_), '=');
 325                         if (!p)
 326                                 continue;
 327                         *p++ = 0;
 328                         p2 = strchr(p, '\n');
 329                         if (p2) {
 330                                 *p2-- = 0;
 331                                 if (*p2 == '\r')
 332                                         *p2 = 0;
 333                         }
 334                         if (def == S_DEF_USER) {
 335                                 sym = sym_find(line + strlen(CONFIG_));
 336                                 if (!sym) {
 337                                         sym_add_change_count(1);
 338                                         goto setsym;
 339                                 }
 340                         } else {
 341                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 342                                 if (sym->type == S_UNKNOWN)
 343                                         sym->type = S_OTHER;
 344                         }
 345                         if (sym->flags & def_flags) {
 346                                 conf_warning("override: reassigning to symbol %s", sym->name);
 347                         }
 348                         if (conf_set_sym_val(sym, def, def_flags, p))
 349                                 continue;
 350                 } else {
 351                         if (line[0] != '\r' && line[0] != '\n')
 352                                 conf_warning("unexpected data: %.*s",
 353                                              (int)strcspn(line, "\r\n"), line);
 354
 355                         continue;
 356                 }
 357 setsym:
 358                 if (sym && sym_is_choice_value(sym)) {
 359                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 360                         switch (sym->def[def].tri) {
 361                         case no:
 362                                 break;
 363                         case mod:
 364                                 if (cs->def[def].tri == yes) {
 365                                         conf_warning("%s creates inconsistent choice state", sym->name);
 366                                         cs->flags &= ~def_flags;
 367                                 }
 368                                 break;
 369                         case yes:
 370                                 if (cs->def[def].tri != no)
 371                                         conf_warning("override: %s changes choice state", sym->name);
 372                                 cs->def[def].val = sym;
 373                                 break;
 374                         }
 375                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 376                 }
 377         }
 378         free(line);
 379         fclose(in);
 380         return 0;
 381 }
 382
 383 int conf_read(const char *name)
 384 {
 385         struct symbol *sym;
 386         int conf_unsaved = 0;
 387         int i;
 388
 389         sym_set_change_count(0);
 390
 391         if (conf_read_simple(name, S_DEF_USER)) {
 392                 sym_calc_value(modules_sym);
 393                 return 1;
 394         }
 395
 396         sym_calc_value(modules_sym);
 397
 398         for_all_symbols(i, sym) {
 399                 sym_calc_value(sym);
 400                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 401                         continue;
 402                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 403                         /* check that calculated value agrees with saved value */
 404                         switch (sym->type) {
 405                         case S_BOOLEAN:
 406                         case S_TRISTATE:
 407                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 408                                         break;
 409                                 if (!sym_is_choice(sym))
 410                                         continue;
 411                                 /* fall through */
 412                         default:
 413                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 414                                         continue;
 415                                 break;
 416                         }
 417                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 418                         /* no previous value and not saved */
 419                         continue;
 420                 conf_unsaved++;
 421                 /* maybe print value in verbose mode... */
 422         }
 423
 424         for_all_symbols(i, sym) {
 425                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 426                         /* Reset values of generates values, so they'll appear
 427                          * as new, if they should become visible, but that
 428                          * doesn't quite work if the Kconfig and the saved
 429                          * configuration disagree.
 430                          */
 431                         if (sym->visible == no && !conf_unsaved)
 432                                 sym->flags &= ~SYMBOL_DEF_USER;
 433                         switch (sym->type) {
 434                         case S_STRING:
 435                         case S_INT:
 436                         case S_HEX:
 437                                 /* Reset a string value if it's out of range */
 438                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 439                                         break;
 440                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 441                                 conf_unsaved++;
 442                                 break;
 443                         default:
 444                                 break;
 445                         }
 446                 }
 447         }
 448
 449         sym_add_change_count(conf_warnings || conf_unsaved);
 450
 451         return 0;
 452 }
 453
 454 /*
 455  * Kconfig configuration printer
 456  *
 457  * This printer is used when generating the resulting configuration after
 458  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 459  * passing a non-NULL argument to the printer.
 460  *
 461  */
 462 static void
 463 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 464 {
 465
 466         switch (sym->type) {
 467         case S_BOOLEAN:
 468         case S_TRISTATE:
 469                 if (*value == 'n') {
 470                         bool skip_unset = (arg != NULL);
 471
 472                         if (!skip_unset)
 473                                 fprintf(fp, "# %s%s is not set\n",
 474                                     CONFIG_, sym->name);
 475                         return;
 476                 }
 477                 break;
 478         default:
 479                 break;
 480         }
 481
 482         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 483 }
 484
 485 static void
 486 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 487 {
 488         const char *p = value;
 489         size_t l;
 490
 491         for (;;) {
 492                 l = strcspn(p, "\n");
 493                 fprintf(fp, "#");
 494                 if (l) {
 495                         fprintf(fp, " ");
 496                         xfwrite(p, l, 1, fp);
 497                         p += l;
 498                 }
 499                 fprintf(fp, "\n");
 500                 if (*p++ == '\0')
 501                         break;
 502         }
 503 }
 504
 505 static struct conf_printer kconfig_printer_cb =
 506 {
 507         .print_symbol = kconfig_print_symbol,
 508         .print_comment = kconfig_print_comment,
 509 };
 510
 511 /*
 512  * Header printer
 513  *
 514  * This printer is used when generating the `include/generated/autoconf.h' file.
 515  */
 516 static void
 517 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 518 {
 519
 520         switch (sym->type) {
 521         case S_BOOLEAN:
 522         case S_TRISTATE: {
 523                 const char *suffix = "";
 524
 525                 switch (*value) {
 526                 case 'n':
 527                         break;
 528                 case 'm':
 529                         suffix = "_MODULE";
 530                         /* fall through */
 531                 default:
 532                         fprintf(fp, "#define %s%s%s 1\n",
 533                             CONFIG_, sym->name, suffix);
 534                 }
 535                 break;
 536         }
 537         case S_HEX: {
 538                 const char *prefix = "";
 539
 540                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 541                         prefix = "0x";
 542                 fprintf(fp, "#define %s%s %s%s\n",
 543                     CONFIG_, sym->name, prefix, value);
 544                 break;
 545         }
 546         case S_STRING:
 547         case S_INT:
 548                 fprintf(fp, "#define %s%s %s\n",
 549                     CONFIG_, sym->name, value);
 550                 break;
 551         default:
 552                 break;
 553         }
 554
 555 }
 556
 557 static void
 558 header_print_comment(FILE *fp, const char *value, void *arg)
 559 {
 560         const char *p = value;
 561         size_t l;
 562
 563         fprintf(fp, "/*\n");
 564         for (;;) {
 565                 l = strcspn(p, "\n");
 566                 fprintf(fp, " *");
 567                 if (l) {
 568                         fprintf(fp, " ");
 569                         xfwrite(p, l, 1, fp);
 570                         p += l;
 571                 }
 572                 fprintf(fp, "\n");
 573                 if (*p++ == '\0')
 574                         break;
 575         }
 576         fprintf(fp, " */\n");
 577 }
 578
 579 static struct conf_printer header_printer_cb =
 580 {
 581         .print_symbol = header_print_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         sym_calc_value(modules_sym);
 828
 829         if (chdir("include/config"))
 830                 return 1;
 831
 832         res = 0;
 833         for_all_symbols(i, sym) {
 834                 sym_calc_value(sym);
 835                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 836                         continue;
 837                 if (sym->flags & SYMBOL_WRITE) {
 838                         if (sym->flags & SYMBOL_DEF_AUTO) {
 839                                 /*
 840                                  * symbol has old and new value,
 841                                  * so compare them...
 842                                  */
 843                                 switch (sym->type) {
 844                                 case S_BOOLEAN:
 845                                 case S_TRISTATE:
 846                                         if (sym_get_tristate_value(sym) ==
 847                                             sym->def[S_DEF_AUTO].tri)
 848                                                 continue;
 849                                         break;
 850                                 case S_STRING:
 851                                 case S_HEX:
 852                                 case S_INT:
 853                                         if (!strcmp(sym_get_string_value(sym),
 854                                                     sym->def[S_DEF_AUTO].val))
 855                                                 continue;
 856                                         break;
 857                                 default:
 858                                         break;
 859                                 }
 860                         } else {
 861                                 /*
 862                                  * If there is no old value, only 'no' (unset)
 863                                  * is allowed as new value.
 864                                  */
 865                                 switch (sym->type) {
 866                                 case S_BOOLEAN:
 867                                 case S_TRISTATE:
 868                                         if (sym_get_tristate_value(sym) == no)
 869                                                 continue;
 870                                         break;
 871                                 default:
 872                                         break;
 873                                 }
 874                         }
 875                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 876                         /* There is neither an old nor a new value. */
 877                         continue;
 878                 /* else
 879                  *      There is an old value, but no new value ('no' (unset)
 880                  *      isn't saved in auto.conf, so the old value is always
 881                  *      different from 'no').
 882                  */
 883
 884                 /* Replace all '_' and append ".h" */
 885                 s = sym->name;
 886                 d = path;
 887                 while ((c = *s++)) {
 888                         c = tolower(c);
 889                         *d++ = (c == '_') ? '/' : c;
 890                 }
 891                 strcpy(d, ".h");
 892
 893                 /* Assume directory path already exists. */
 894                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 895                 if (fd == -1) {
 896                         if (errno != ENOENT) {
 897                                 res = 1;
 898                                 break;
 899                         }
 900                         /*
 901                          * Create directory components,
 902                          * unless they exist already.
 903                          */
 904                         d = path;
 905                         while ((d = strchr(d, '/'))) {
 906                                 *d = 0;
 907                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 908                                         res = 1;
 909                                         goto out;
 910                                 }
 911                                 *d++ = '/';
 912                         }
 913                         /* Try it again. */
 914                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 915                         if (fd == -1) {
 916                                 res = 1;
 917                                 break;
 918                         }
 919                 }
 920                 close(fd);
 921         }
 922 out:
 923         if (chdir("../.."))
 924                 return 1;
 925
 926         return res;
 927 }
 928
 929 int conf_write_autoconf(void)
 930 {
 931         struct symbol *sym;
 932         const char *name;
 933         FILE *out, *tristate, *out_h;
 934         int i;
 935
 936         sym_clear_all_valid();
 937
 938         file_write_dep("include/config/auto.conf.cmd");
 939
 940         if (conf_split_config())
 941                 return 1;
 942
 943         out = fopen(".tmpconfig", "w");
 944         if (!out)
 945                 return 1;
 946
 947         tristate = fopen(".tmpconfig_tristate", "w");
 948         if (!tristate) {
 949                 fclose(out);
 950                 return 1;
 951         }
 952
 953         out_h = fopen(".tmpconfig.h", "w");
 954         if (!out_h) {
 955                 fclose(out);
 956                 fclose(tristate);
 957                 return 1;
 958         }
 959
 960         conf_write_heading(out, &kconfig_printer_cb, NULL);
 961
 962         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 963
 964         conf_write_heading(out_h, &header_printer_cb, NULL);
 965
 966         for_all_symbols(i, sym) {
 967                 sym_calc_value(sym);
 968                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 969                         continue;
 970
 971                 /* write symbol to auto.conf, tristate and header files */
 972                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 973
 974                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 975
 976                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 977         }
 978         fclose(out);
 979         fclose(tristate);
 980         fclose(out_h);
 981
 982         name = getenv("KCONFIG_AUTOHEADER");
 983         if (!name)
 984                 name = "include/generated/autoconf.h";
 985         if (rename(".tmpconfig.h", name))
 986                 return 1;
 987         name = getenv("KCONFIG_TRISTATE");
 988         if (!name)
 989                 name = "include/config/tristate.conf";
 990         if (rename(".tmpconfig_tristate", name))
 991                 return 1;
 992         name = conf_get_autoconfig_name();
 993         /*
 994          * This must be the last step, kbuild has a dependency on auto.conf
 995          * and this marks the successful completion of the previous steps.
 996          */
 997         if (rename(".tmpconfig", name))
 998                 return 1;
 999
1000         return 0;
1001 }
1002
1003 static int sym_change_count;
1004 static void (*conf_changed_callback)(void);
1005
1006 void sym_set_change_count(int count)
1007 {
1008         int _sym_change_count = sym_change_count;
1009         sym_change_count = count;
1010         if (conf_changed_callback &&
1011             (bool)_sym_change_count != (bool)count)
1012                 conf_changed_callback();
1013 }
1014
1015 void sym_add_change_count(int count)
1016 {
1017         sym_set_change_count(count + sym_change_count);
1018 }
1019
1020 bool conf_get_changed(void)
1021 {
1022         return sym_change_count;
1023 }
1024
1025 void conf_set_changed_callback(void (*fn)(void))
1026 {
1027         conf_changed_callback = fn;
1028 }
1029
1030 static bool randomize_choice_values(struct symbol *csym)
1031 {
1032         struct property *prop;
1033         struct symbol *sym;
1034         struct expr *e;
1035         int cnt, def;
1036
1037         /*
1038          * If choice is mod then we may have more items selected
1039          * and if no then no-one.
1040          * In both cases stop.
1041          */
1042         if (csym->curr.tri != yes)
1043                 return false;
1044
1045         prop = sym_get_choice_prop(csym);
1046
1047         /* count entries in choice block */
1048         cnt = 0;
1049         expr_list_for_each_sym(prop->expr, e, sym)
1050                 cnt++;
1051
1052         /*
1053          * find a random value and set it to yes,
1054          * set the rest to no so we have only one set
1055          */
1056         def = (rand() % cnt);
1057
1058         cnt = 0;
1059         expr_list_for_each_sym(prop->expr, e, sym) {
1060                 if (def == cnt++) {
1061                         sym->def[S_DEF_USER].tri = yes;
1062                         csym->def[S_DEF_USER].val = sym;
1063                 }
1064                 else {
1065                         sym->def[S_DEF_USER].tri = no;
1066                 }
1067                 sym->flags |= SYMBOL_DEF_USER;
1068                 /* clear VALID to get value calculated */
1069                 sym->flags &= ~SYMBOL_VALID;
1070         }
1071         csym->flags |= SYMBOL_DEF_USER;
1072         /* clear VALID to get value calculated */
1073         csym->flags &= ~(SYMBOL_VALID);
1074
1075         return true;
1076 }
1077
1078 void set_all_choice_values(struct symbol *csym)
1079 {
1080         struct property *prop;
1081         struct symbol *sym;
1082         struct expr *e;
1083
1084         prop = sym_get_choice_prop(csym);
1085
1086         /*
1087          * Set all non-assinged choice values to no
1088          */
1089         expr_list_for_each_sym(prop->expr, e, sym) {
1090                 if (!sym_has_value(sym))
1091                         sym->def[S_DEF_USER].tri = no;
1092         }
1093         csym->flags |= SYMBOL_DEF_USER;
1094         /* clear VALID to get value calculated */
1095         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1096 }
1097
1098 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1099 {
1100         struct symbol *sym, *csym;
1101         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1102                                          * pty: probability of tristate = y
1103                                          * ptm: probability of tristate = m
1104                                          */
1105
1106         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1107                                    * below, otherwise gcc whines about
1108                                    * -Wmaybe-uninitialized */
1109         if (mode == def_random) {
1110                 int n, p[3];
1111                 char *env = getenv("KCONFIG_PROBABILITY");
1112                 n = 0;
1113                 while( env && *env ) {
1114                         char *endp;
1115                         int tmp = strtol( env, &endp, 10 );
1116                         if( tmp >= 0 && tmp <= 100 ) {
1117                                 p[n++] = tmp;
1118                         } else {
1119                                 errno = ERANGE;
1120                                 perror( "KCONFIG_PROBABILITY" );
1121                                 exit( 1 );
1122                         }
1123                         env = (*endp == ':') ? endp+1 : endp;
1124                         if( n >=3 ) {
1125                                 break;
1126                         }
1127                 }
1128                 switch( n ) {
1129                 case 1:
1130                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1131                         break;
1132                 case 2:
1133                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1134                         break;
1135                 case 3:
1136                         pby = p[0]; pty = p[1]; ptm = p[2];
1137                         break;
1138                 }
1139
1140                 if( pty+ptm > 100 ) {
1141                         errno = ERANGE;
1142                         perror( "KCONFIG_PROBABILITY" );
1143                         exit( 1 );
1144                 }
1145         }
1146         bool has_changed = false;
1147
1148         for_all_symbols(i, sym) {
1149                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1150                         continue;
1151                 switch (sym_get_type(sym)) {
1152                 case S_BOOLEAN:
1153                 case S_TRISTATE:
1154                         has_changed = true;
1155                         switch (mode) {
1156                         case def_yes:
1157                                 sym->def[S_DEF_USER].tri = yes;
1158                                 break;
1159                         case def_mod:
1160                                 sym->def[S_DEF_USER].tri = mod;
1161                                 break;
1162                         case def_no:
1163                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1164                                         sym->def[S_DEF_USER].tri = yes;
1165                                 else
1166                                         sym->def[S_DEF_USER].tri = no;
1167                                 break;
1168                         case def_random:
1169                                 sym->def[S_DEF_USER].tri = no;
1170                                 cnt = rand() % 100;
1171                                 if (sym->type == S_TRISTATE) {
1172                                         if (cnt < pty)
1173                                                 sym->def[S_DEF_USER].tri = yes;
1174                                         else if (cnt < (pty+ptm))
1175                                                 sym->def[S_DEF_USER].tri = mod;
1176                                 } else if (cnt < pby)
1177                                         sym->def[S_DEF_USER].tri = yes;
1178                                 break;
1179                         default:
1180                                 continue;
1181                         }
1182                         if (!(sym_is_choice(sym) && mode == def_random))
1183                                 sym->flags |= SYMBOL_DEF_USER;
1184                         break;
1185                 default:
1186                         break;
1187                 }
1188
1189         }
1190
1191         sym_clear_all_valid();
1192
1193         /*
1194          * We have different type of choice blocks.
1195          * If curr.tri equals to mod then we can select several
1196          * choice symbols in one block.
1197          * In this case we do nothing.
1198          * If curr.tri equals yes then only one symbol can be
1199          * selected in a choice block and we set it to yes,
1200          * and the rest to no.
1201          */
1202         if (mode != def_random) {
1203                 for_all_symbols(i, csym) {
1204                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1205                             sym_is_choice_value(csym))
1206                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1207                 }
1208         }
1209
1210         for_all_symbols(i, csym) {
1211                 if (sym_has_value(csym) || !sym_is_choice(csym))
1212                         continue;
1213
1214                 sym_calc_value(csym);
1215                 if (mode == def_random)
1216                         has_changed = randomize_choice_values(csym);
1217                 else {
1218                         set_all_choice_values(csym);
1219                         has_changed = true;
1220                 }
1221         }
1222
1223         return has_changed;
1224 }