scripts/kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <[email protected]>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 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                 /* Last char has to be a '"' */
 139                 if (p[strlen(p) - 1] != '"') {
 140                         if (def != S_DEF_AUTO)
 141                                 conf_warning("invalid string found");
 142                         return 1;
 143                 }
 144                 /* Overwrite '"' with \0 for string termination */
 145                 p[strlen(p) - 1] = 0;
 146                 /* fall through */
 147         case S_INT:
 148         case S_HEX:
 149         done:
 150                 if (sym_string_valid(sym, p)) {
 151                         sym->def[def].val = xstrdup(p);
 152                         sym->flags |= def_flags;
 153                 } else {
 154                         if (def != S_DEF_AUTO)
 155                                 conf_warning("symbol value '%s' invalid for %s",
 156                                              p, sym->name);
 157                         return 1;
 158                 }
 159                 break;
 160         default:
 161                 ;
 162         }
 163         return 0;
 164 }
 165
 166 #define LINE_GROWTH 16
 167 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 168 {
 169         char *nline;
 170         size_t new_size = slen + 1;
 171         if (new_size > *n) {
 172                 new_size += LINE_GROWTH - 1;
 173                 new_size *= 2;
 174                 nline = xrealloc(*lineptr, new_size);
 175                 if (!nline)
 176                         return -1;
 177
 178                 *lineptr = nline;
 179                 *n = new_size;
 180         }
 181
 182         (*lineptr)[slen] = c;
 183
 184         return 0;
 185 }
 186
 187 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 188 {
 189         char *line = *lineptr;
 190         size_t slen = 0;
 191
 192         for (;;) {
 193                 int c = getc(stream);
 194
 195                 switch (c) {
 196                 case '\n':
 197                         if (add_byte(c, &line, slen, n) < 0)
 198                                 goto e_out;
 199                         slen++;
 200                         /* fall through */
 201                 case EOF:
 202                         if (add_byte('\0', &line, slen, n) < 0)
 203                                 goto e_out;
 204                         *lineptr = line;
 205                         if (slen == 0)
 206                                 return -1;
 207                         return slen;
 208                 default:
 209                         if (add_byte(c, &line, slen, n) < 0)
 210                                 goto e_out;
 211                         slen++;
 212                 }
 213         }
 214
 215 e_out:
 216         line[slen-1] = '\0';
 217         *lineptr = line;
 218         return -1;
 219 }
 220
 221 int conf_read_simple(const char *name, int def)
 222 {
 223         FILE *in = NULL;
 224         char   *line = NULL;
 225         size_t  line_asize = 0;
 226         char *p, *p2;
 227         struct symbol *sym;
 228         int i, def_flags;
 229
 230         if (name) {
 231                 in = zconf_fopen(name);
 232         } else {
 233                 struct property *prop;
 234
 235                 name = conf_get_configname();
 236                 in = zconf_fopen(name);
 237                 if (in)
 238                         goto load;
 239                 sym_add_change_count(1);
 240                 if (!sym_defconfig_list)
 241                         return 1;
 242
 243                 for_all_defaults(sym_defconfig_list, prop) {
 244                         if (expr_calc_value(prop->visible.expr) == no ||
 245                             prop->expr->type != E_SYMBOL)
 246                                 continue;
 247                         sym_calc_value(prop->expr->left.sym);
 248                         name = sym_get_string_value(prop->expr->left.sym);
 249                         in = zconf_fopen(name);
 250                         if (in) {
 251                                 conf_message("using defaults found in %s",
 252                                          name);
 253                                 goto load;
 254                         }
 255                 }
 256         }
 257         if (!in)
 258                 return 1;
 259
 260 load:
 261         conf_filename = name;
 262         conf_lineno = 0;
 263         conf_warnings = 0;
 264
 265         def_flags = SYMBOL_DEF << def;
 266         for_all_symbols(i, sym) {
 267                 sym->flags |= SYMBOL_CHANGED;
 268                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 269                 if (sym_is_choice(sym))
 270                         sym->flags |= def_flags;
 271                 switch (sym->type) {
 272                 case S_INT:
 273                 case S_HEX:
 274                 case S_STRING:
 275                         if (sym->def[def].val)
 276                                 free(sym->def[def].val);
 277                         /* fall through */
 278                 default:
 279                         sym->def[def].val = NULL;
 280                         sym->def[def].tri = no;
 281                 }
 282         }
 283
 284         while (compat_getline(&line, &line_asize, in) != -1) {
 285                 conf_lineno++;
 286                 sym = NULL;
 287                 if (line[0] == '#') {
 288                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 289                                 continue;
 290                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 291                         if (!p)
 292                                 continue;
 293                         *p++ = 0;
 294                         if (strncmp(p, "is not set", 10))
 295                                 continue;
 296                         if (def == S_DEF_USER) {
 297                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 298                                 if (!sym) {
 299                                         sym_add_change_count(1);
 300                                         goto setsym;
 301                                 }
 302                         } else {
 303                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 304                                 if (sym->type == S_UNKNOWN)
 305                                         sym->type = S_BOOLEAN;
 306                         }
 307                         if (sym->flags & def_flags) {
 308                                 conf_warning("override: reassigning to symbol %s", sym->name);
 309                         }
 310                         switch (sym->type) {
 311                         case S_BOOLEAN:
 312                         case S_TRISTATE:
 313                                 sym->def[def].tri = no;
 314                                 sym->flags |= def_flags;
 315                                 break;
 316                         default:
 317                                 ;
 318                         }
 319                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 320                         p = strchr(line + strlen(CONFIG_), '=');
 321                         if (!p)
 322                                 continue;
 323                         *p++ = 0;
 324                         p2 = strchr(p, '\n');
 325                         if (p2) {
 326                                 *p2-- = 0;
 327                                 if (*p2 == '\r')
 328                                         *p2 = 0;
 329                         }
 330                         if (def == S_DEF_USER) {
 331                                 sym = sym_find(line + strlen(CONFIG_));
 332                                 if (!sym) {
 333                                         sym_add_change_count(1);
 334                                         goto setsym;
 335                                 }
 336                         } else {
 337                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 338                                 if (sym->type == S_UNKNOWN)
 339                                         sym->type = S_OTHER;
 340                         }
 341                         if (sym->flags & def_flags) {
 342                                 conf_warning("override: reassigning to symbol %s", sym->name);
 343                         }
 344                         if (conf_set_sym_val(sym, def, def_flags, p))
 345                                 continue;
 346                 } else {
 347                         if (line[0] != '\r' && line[0] != '\n')
 348                                 conf_warning("unexpected data: %.*s",
 349                                              (int)strcspn(line, "\r\n"), line);
 350
 351                         continue;
 352                 }
 353 setsym:
 354                 if (sym && sym_is_choice_value(sym)) {
 355                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 356                         switch (sym->def[def].tri) {
 357                         case no:
 358                                 break;
 359                         case mod:
 360                                 if (cs->def[def].tri == yes) {
 361                                         conf_warning("%s creates inconsistent choice state", sym->name);
 362                                         cs->flags &= ~def_flags;
 363                                 }
 364                                 break;
 365                         case yes:
 366                                 if (cs->def[def].tri != no)
 367                                         conf_warning("override: %s changes choice state", sym->name);
 368                                 cs->def[def].val = sym;
 369                                 break;
 370                         }
 371                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 372                 }
 373         }
 374         free(line);
 375         fclose(in);
 376         return 0;
 377 }
 378
 379 int conf_read(const char *name)
 380 {
 381         struct symbol *sym;
 382         int conf_unsaved = 0;
 383         int i;
 384
 385         sym_set_change_count(0);
 386
 387         if (conf_read_simple(name, S_DEF_USER)) {
 388                 sym_calc_value(modules_sym);
 389                 return 1;
 390         }
 391
 392         sym_calc_value(modules_sym);
 393
 394         for_all_symbols(i, sym) {
 395                 sym_calc_value(sym);
 396                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 397                         continue;
 398                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 399                         /* check that calculated value agrees with saved value */
 400                         switch (sym->type) {
 401                         case S_BOOLEAN:
 402                         case S_TRISTATE:
 403                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 404                                         break;
 405                                 if (!sym_is_choice(sym))
 406                                         continue;
 407                                 /* fall through */
 408                         default:
 409                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 410                                         continue;
 411                                 break;
 412                         }
 413                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 414                         /* no previous value and not saved */
 415                         continue;
 416                 conf_unsaved++;
 417                 /* maybe print value in verbose mode... */
 418         }
 419
 420         for_all_symbols(i, sym) {
 421                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 422                         /* Reset values of generates values, so they'll appear
 423                          * as new, if they should become visible, but that
 424                          * doesn't quite work if the Kconfig and the saved
 425                          * configuration disagree.
 426                          */
 427                         if (sym->visible == no && !conf_unsaved)
 428                                 sym->flags &= ~SYMBOL_DEF_USER;
 429                         switch (sym->type) {
 430                         case S_STRING:
 431                         case S_INT:
 432                         case S_HEX:
 433                                 /* Reset a string value if it's out of range */
 434                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 435                                         break;
 436                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 437                                 conf_unsaved++;
 438                                 break;
 439                         default:
 440                                 break;
 441                         }
 442                 }
 443         }
 444
 445         sym_add_change_count(conf_warnings || conf_unsaved);
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Kconfig configuration printer
 452  *
 453  * This printer is used when generating the resulting configuration after
 454  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 455  * passing a non-NULL argument to the printer.
 456  *
 457  */
 458 static void
 459 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 460 {
 461
 462         switch (sym->type) {
 463         case S_BOOLEAN:
 464         case S_TRISTATE:
 465                 if (*value == 'n') {
 466                         bool skip_unset = (arg != NULL);
 467
 468                         if (!skip_unset)
 469                                 fprintf(fp, "# %s%s is not set\n",
 470                                     CONFIG_, sym->name);
 471                         return;
 472                 }
 473                 break;
 474         default:
 475                 break;
 476         }
 477
 478         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 479 }
 480
 481 static void
 482 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 483 {
 484         const char *p = value;
 485         size_t l;
 486
 487         for (;;) {
 488                 l = strcspn(p, "\n");
 489                 fprintf(fp, "#");
 490                 if (l) {
 491                         fprintf(fp, " ");
 492                         xfwrite(p, l, 1, fp);
 493                         p += l;
 494                 }
 495                 fprintf(fp, "\n");
 496                 if (*p++ == '\0')
 497                         break;
 498         }
 499 }
 500
 501 static struct conf_printer kconfig_printer_cb =
 502 {
 503         .print_symbol = kconfig_print_symbol,
 504         .print_comment = kconfig_print_comment,
 505 };
 506
 507 /*
 508  * Header printer
 509  *
 510  * This printer is used when generating the `include/generated/autoconf.h' file.
 511  */
 512 static void
 513 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 514 {
 515
 516         switch (sym->type) {
 517         case S_BOOLEAN:
 518         case S_TRISTATE: {
 519                 const char *suffix = "";
 520
 521                 switch (*value) {
 522                 case 'n':
 523                         break;
 524                 case 'm':
 525                         suffix = "_MODULE";
 526                         /* fall through */
 527                 default:
 528                         fprintf(fp, "#define %s%s%s 1\n",
 529                             CONFIG_, sym->name, suffix);
 530                 }
 531                 break;
 532         }
 533         case S_HEX: {
 534                 const char *prefix = "";
 535
 536                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 537                         prefix = "0x";
 538                 fprintf(fp, "#define %s%s %s%s\n",
 539                     CONFIG_, sym->name, prefix, value);
 540                 break;
 541         }
 542         case S_STRING:
 543         case S_INT:
 544                 fprintf(fp, "#define %s%s %s\n",
 545                     CONFIG_, sym->name, value);
 546                 break;
 547         default:
 548                 break;
 549         }
 550
 551 }
 552
 553 static void
 554 header_print_comment(FILE *fp, const char *value, void *arg)
 555 {
 556         const char *p = value;
 557         size_t l;
 558
 559         fprintf(fp, "/*\n");
 560         for (;;) {
 561                 l = strcspn(p, "\n");
 562                 fprintf(fp, " *");
 563                 if (l) {
 564                         fprintf(fp, " ");
 565                         xfwrite(p, l, 1, fp);
 566                         p += l;
 567                 }
 568                 fprintf(fp, "\n");
 569                 if (*p++ == '\0')
 570                         break;
 571         }
 572         fprintf(fp, " */\n");
 573 }
 574
 575 static struct conf_printer header_printer_cb =
 576 {
 577         .print_symbol = header_print_symbol,
 578         .print_comment = header_print_comment,
 579 };
 580
 581 /*
 582  * Tristate printer
 583  *
 584  * This printer is used when generating the `include/config/tristate.conf' file.
 585  */
 586 static void
 587 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 588 {
 589
 590         if (sym->type == S_TRISTATE && *value != 'n')
 591                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 592 }
 593
 594 static struct conf_printer tristate_printer_cb =
 595 {
 596         .print_symbol = tristate_print_symbol,
 597         .print_comment = kconfig_print_comment,
 598 };
 599
 600 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 601                               struct conf_printer *printer, void *printer_arg)
 602 {
 603         const char *str;
 604         char *str2;
 605
 606         switch (sym->type) {
 607         case S_OTHER:
 608         case S_UNKNOWN:
 609                 break;
 610         case S_STRING:
 611                 str = sym_get_string_value(sym);
 612                 str2 = xmalloc(strlen(str) + 3);
 613                 sprintf(str2, "\"%s\"", str);
 614                 printer->print_symbol(fp, sym, str2, printer_arg);
 615                 free((void *)str2);
 616                 break;
 617         default:
 618                 str = sym_get_string_value(sym);
 619                 printer->print_symbol(fp, sym, str, printer_arg);
 620         }
 621 }
 622
 623 static void
 624 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 625 {
 626         char buf[256];
 627
 628         snprintf(buf, sizeof(buf),
 629             "\n"
 630             "Automatically generated file; DO NOT EDIT.\n"
 631             "%s\n",
 632             rootmenu.prompt->text);
 633
 634         printer->print_comment(fp, buf, printer_arg);
 635 }
 636
 637 /*
 638  * Write out a minimal config.
 639  * All values that has default values are skipped as this is redundant.
 640  */
 641 int conf_write_defconfig(const char *filename)
 642 {
 643         struct symbol *sym;
 644         struct menu *menu;
 645         FILE *out;
 646
 647         out = fopen(filename, "w");
 648         if (!out)
 649                 return 1;
 650
 651         sym_clear_all_valid();
 652
 653         /* Traverse all menus to find all relevant symbols */
 654         menu = rootmenu.list;
 655
 656         while (menu != NULL)
 657         {
 658                 sym = menu->sym;
 659                 if (sym == NULL) {
 660                         if (!menu_is_visible(menu))
 661                                 goto next_menu;
 662                 } else if (!sym_is_choice(sym)) {
 663                         sym_calc_value(sym);
 664                         if (!(sym->flags & SYMBOL_WRITE))
 665                                 goto next_menu;
 666                         sym->flags &= ~SYMBOL_WRITE;
 667                         /* If we cannot change the symbol - skip */
 668                         if (!sym_is_changable(sym))
 669                                 goto next_menu;
 670                         /* If symbol equals to default value - skip */
 671                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 672                                 goto next_menu;
 673
 674                         /*
 675                          * If symbol is a choice value and equals to the
 676                          * default for a choice - skip.
 677                          * But only if value is bool and equal to "y" and
 678                          * choice is not "optional".
 679                          * (If choice is "optional" then all values can be "n")
 680                          */
 681                         if (sym_is_choice_value(sym)) {
 682                                 struct symbol *cs;
 683                                 struct symbol *ds;
 684
 685                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 686                                 ds = sym_choice_default(cs);
 687                                 if (!sym_is_optional(cs) && sym == ds) {
 688                                         if ((sym->type == S_BOOLEAN) &&
 689                                             sym_get_tristate_value(sym) == yes)
 690                                                 goto next_menu;
 691                                 }
 692                         }
 693                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 694                 }
 695 next_menu:
 696                 if (menu->list != NULL) {
 697                         menu = menu->list;
 698                 }
 699                 else if (menu->next != NULL) {
 700                         menu = menu->next;
 701                 } else {
 702                         while ((menu = menu->parent)) {
 703                                 if (menu->next != NULL) {
 704                                         menu = menu->next;
 705                                         break;
 706                                 }
 707                         }
 708                 }
 709         }
 710         fclose(out);
 711         return 0;
 712 }
 713
 714 int conf_write(const char *name)
 715 {
 716         FILE *out;
 717         struct symbol *sym;
 718         struct menu *menu;
 719         const char *basename;
 720         const char *str;
 721         char dirname[PATH_MAX+1], tmpname[PATH_MAX+22], newname[PATH_MAX+8];
 722         char *env;
 723
 724         dirname[0] = 0;
 725         if (name && name[0]) {
 726                 struct stat st;
 727                 char *slash;
 728
 729                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 730                         strcpy(dirname, name);
 731                         strcat(dirname, "/");
 732                         basename = conf_get_configname();
 733                 } else if ((slash = strrchr(name, '/'))) {
 734                         int size = slash - name + 1;
 735                         memcpy(dirname, name, size);
 736                         dirname[size] = 0;
 737                         if (slash[1])
 738                                 basename = slash + 1;
 739                         else
 740                                 basename = conf_get_configname();
 741                 } else
 742                         basename = name;
 743         } else
 744                 basename = conf_get_configname();
 745
 746         sprintf(newname, "%s%s", dirname, basename);
 747         env = getenv("KCONFIG_OVERWRITECONFIG");
 748         if (!env || !*env) {
 749                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 750                 out = fopen(tmpname, "w");
 751         } else {
 752                 *tmpname = 0;
 753                 out = fopen(newname, "w");
 754         }
 755         if (!out)
 756                 return 1;
 757
 758         conf_write_heading(out, &kconfig_printer_cb, NULL);
 759
 760         if (!conf_get_changed())
 761                 sym_clear_all_valid();
 762
 763         menu = rootmenu.list;
 764         while (menu) {
 765                 sym = menu->sym;
 766                 if (!sym) {
 767                         if (!menu_is_visible(menu))
 768                                 goto next;
 769                         str = menu_get_prompt(menu);
 770                         fprintf(out, "\n"
 771                                      "#\n"
 772                                      "# %s\n"
 773                                      "#\n", str);
 774                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 775                         sym_calc_value(sym);
 776                         if (!(sym->flags & SYMBOL_WRITE))
 777                                 goto next;
 778                         sym->flags &= ~SYMBOL_WRITE;
 779
 780                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 781                 }
 782
 783 next:
 784                 if (menu->list) {
 785                         menu = menu->list;
 786                         continue;
 787                 }
 788                 if (menu->next)
 789                         menu = menu->next;
 790                 else while ((menu = menu->parent)) {
 791                         if (menu->next) {
 792                                 menu = menu->next;
 793                                 break;
 794                         }
 795                 }
 796         }
 797         fclose(out);
 798
 799         if (*tmpname) {
 800                 strcat(dirname, basename);
 801                 strcat(dirname, ".old");
 802                 rename(newname, dirname);
 803                 if (rename(tmpname, newname))
 804                         return 1;
 805         }
 806
 807         conf_message("configuration written to %s", newname);
 808
 809         sym_set_change_count(0);
 810
 811         return 0;
 812 }
 813
 814 static int conf_split_config(void)
 815 {
 816         const char *name;
 817         char path[PATH_MAX+1];
 818         char *s, *d, c;
 819         struct symbol *sym;
 820         struct stat sb;
 821         int res, i, fd;
 822
 823         name = conf_get_autoconfig_name();
 824         conf_read_simple(name, S_DEF_AUTO);
 825         sym_calc_value(modules_sym);
 826
 827         if (chdir("include/config"))
 828                 return 1;
 829
 830         res = 0;
 831         for_all_symbols(i, sym) {
 832                 sym_calc_value(sym);
 833                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 834                         continue;
 835                 if (sym->flags & SYMBOL_WRITE) {
 836                         if (sym->flags & SYMBOL_DEF_AUTO) {
 837                                 /*
 838                                  * symbol has old and new value,
 839                                  * so compare them...
 840                                  */
 841                                 switch (sym->type) {
 842                                 case S_BOOLEAN:
 843                                 case S_TRISTATE:
 844                                         if (sym_get_tristate_value(sym) ==
 845                                             sym->def[S_DEF_AUTO].tri)
 846                                                 continue;
 847                                         break;
 848                                 case S_STRING:
 849                                 case S_HEX:
 850                                 case S_INT:
 851                                         if (!strcmp(sym_get_string_value(sym),
 852                                                     sym->def[S_DEF_AUTO].val))
 853                                                 continue;
 854                                         break;
 855                                 default:
 856                                         break;
 857                                 }
 858                         } else {
 859                                 /*
 860                                  * If there is no old value, only 'no' (unset)
 861                                  * is allowed as new value.
 862                                  */
 863                                 switch (sym->type) {
 864                                 case S_BOOLEAN:
 865                                 case S_TRISTATE:
 866                                         if (sym_get_tristate_value(sym) == no)
 867                                                 continue;
 868                                         break;
 869                                 default:
 870                                         break;
 871                                 }
 872                         }
 873                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 874                         /* There is neither an old nor a new value. */
 875                         continue;
 876                 /* else
 877                  *      There is an old value, but no new value ('no' (unset)
 878                  *      isn't saved in auto.conf, so the old value is always
 879                  *      different from 'no').
 880                  */
 881
 882                 /* Replace all '_' and append ".h" */
 883                 s = sym->name;
 884                 d = path;
 885                 while ((c = *s++)) {
 886                         c = tolower(c);
 887                         *d++ = (c == '_') ? '/' : c;
 888                 }
 889                 strcpy(d, ".h");
 890
 891                 /* Assume directory path already exists. */
 892                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 893                 if (fd == -1) {
 894                         if (errno != ENOENT) {
 895                                 res = 1;
 896                                 break;
 897                         }
 898                         /*
 899                          * Create directory components,
 900                          * unless they exist already.
 901                          */
 902                         d = path;
 903                         while ((d = strchr(d, '/'))) {
 904                                 *d = 0;
 905                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 906                                         res = 1;
 907                                         goto out;
 908                                 }
 909                                 *d++ = '/';
 910                         }
 911                         /* Try it again. */
 912                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 913                         if (fd == -1) {
 914                                 res = 1;
 915                                 break;
 916                         }
 917                 }
 918                 close(fd);
 919         }
 920 out:
 921         if (chdir("../.."))
 922                 return 1;
 923
 924         return res;
 925 }
 926
 927 int conf_write_autoconf(void)
 928 {
 929         struct symbol *sym;
 930         const char *name;
 931         FILE *out, *tristate, *out_h;
 932         int i;
 933
 934         sym_clear_all_valid();
 935
 936         file_write_dep("include/config/auto.conf.cmd");
 937
 938         if (conf_split_config())
 939                 return 1;
 940
 941         out = fopen(".tmpconfig", "w");
 942         if (!out)
 943                 return 1;
 944
 945         tristate = fopen(".tmpconfig_tristate", "w");
 946         if (!tristate) {
 947                 fclose(out);
 948                 return 1;
 949         }
 950
 951         out_h = fopen(".tmpconfig.h", "w");
 952         if (!out_h) {
 953                 fclose(out);
 954                 fclose(tristate);
 955                 return 1;
 956         }
 957
 958         conf_write_heading(out, &kconfig_printer_cb, NULL);
 959
 960         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 961
 962         conf_write_heading(out_h, &header_printer_cb, NULL);
 963
 964         for_all_symbols(i, sym) {
 965                 sym_calc_value(sym);
 966                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 967                         continue;
 968
 969                 /* write symbol to auto.conf, tristate and header files */
 970                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 971
 972                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 973
 974                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 975         }
 976         fclose(out);
 977         fclose(tristate);
 978         fclose(out_h);
 979
 980         name = getenv("KCONFIG_AUTOHEADER");
 981         if (!name)
 982                 name = "include/generated/autoconf.h";
 983         if (rename(".tmpconfig.h", name))
 984                 return 1;
 985         name = getenv("KCONFIG_TRISTATE");
 986         if (!name)
 987                 name = "include/config/tristate.conf";
 988         if (rename(".tmpconfig_tristate", name))
 989                 return 1;
 990         name = conf_get_autoconfig_name();
 991         /*
 992          * This must be the last step, kbuild has a dependency on auto.conf
 993          * and this marks the successful completion of the previous steps.
 994          */
 995         if (rename(".tmpconfig", name))
 996                 return 1;
 997
 998         return 0;
 999 }
1000
1001 static int sym_change_count;
1002 static void (*conf_changed_callback)(void);
1003
1004 void sym_set_change_count(int count)
1005 {
1006         int _sym_change_count = sym_change_count;
1007         sym_change_count = count;
1008         if (conf_changed_callback &&
1009             (bool)_sym_change_count != (bool)count)
1010                 conf_changed_callback();
1011 }
1012
1013 void sym_add_change_count(int count)
1014 {
1015         sym_set_change_count(count + sym_change_count);
1016 }
1017
1018 bool conf_get_changed(void)
1019 {
1020         return sym_change_count;
1021 }
1022
1023 void conf_set_changed_callback(void (*fn)(void))
1024 {
1025         conf_changed_callback = fn;
1026 }
1027
1028 static bool randomize_choice_values(struct symbol *csym)
1029 {
1030         struct property *prop;
1031         struct symbol *sym;
1032         struct expr *e;
1033         int cnt, def;
1034
1035         /*
1036          * If choice is mod then we may have more items selected
1037          * and if no then no-one.
1038          * In both cases stop.
1039          */
1040         if (csym->curr.tri != yes)
1041                 return false;
1042
1043         prop = sym_get_choice_prop(csym);
1044
1045         /* count entries in choice block */
1046         cnt = 0;
1047         expr_list_for_each_sym(prop->expr, e, sym)
1048                 cnt++;
1049
1050         /*
1051          * find a random value and set it to yes,
1052          * set the rest to no so we have only one set
1053          */
1054         def = (rand() % cnt);
1055
1056         cnt = 0;
1057         expr_list_for_each_sym(prop->expr, e, sym) {
1058                 if (def == cnt++) {
1059                         sym->def[S_DEF_USER].tri = yes;
1060                         csym->def[S_DEF_USER].val = sym;
1061                 }
1062                 else {
1063                         sym->def[S_DEF_USER].tri = no;
1064                 }
1065                 sym->flags |= SYMBOL_DEF_USER;
1066                 /* clear VALID to get value calculated */
1067                 sym->flags &= ~SYMBOL_VALID;
1068         }
1069         csym->flags |= SYMBOL_DEF_USER;
1070         /* clear VALID to get value calculated */
1071         csym->flags &= ~(SYMBOL_VALID);
1072
1073         return true;
1074 }
1075
1076 void set_all_choice_values(struct symbol *csym)
1077 {
1078         struct property *prop;
1079         struct symbol *sym;
1080         struct expr *e;
1081
1082         prop = sym_get_choice_prop(csym);
1083
1084         /*
1085          * Set all non-assinged choice values to no
1086          */
1087         expr_list_for_each_sym(prop->expr, e, sym) {
1088                 if (!sym_has_value(sym))
1089                         sym->def[S_DEF_USER].tri = no;
1090         }
1091         csym->flags |= SYMBOL_DEF_USER;
1092         /* clear VALID to get value calculated */
1093         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1094 }
1095
1096 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1097 {
1098         struct symbol *sym, *csym;
1099         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1100                                          * pty: probability of tristate = y
1101                                          * ptm: probability of tristate = m
1102                                          */
1103
1104         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1105                                    * below, otherwise gcc whines about
1106                                    * -Wmaybe-uninitialized */
1107         if (mode == def_random) {
1108                 int n, p[3];
1109                 char *env = getenv("KCONFIG_PROBABILITY");
1110                 n = 0;
1111                 while( env && *env ) {
1112                         char *endp;
1113                         int tmp = strtol( env, &endp, 10 );
1114                         if( tmp >= 0 && tmp <= 100 ) {
1115                                 p[n++] = tmp;
1116                         } else {
1117                                 errno = ERANGE;
1118                                 perror( "KCONFIG_PROBABILITY" );
1119                                 exit( 1 );
1120                         }
1121                         env = (*endp == ':') ? endp+1 : endp;
1122                         if( n >=3 ) {
1123                                 break;
1124                         }
1125                 }
1126                 switch( n ) {
1127                 case 1:
1128                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1129                         break;
1130                 case 2:
1131                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1132                         break;
1133                 case 3:
1134                         pby = p[0]; pty = p[1]; ptm = p[2];
1135                         break;
1136                 }
1137
1138                 if( pty+ptm > 100 ) {
1139                         errno = ERANGE;
1140                         perror( "KCONFIG_PROBABILITY" );
1141                         exit( 1 );
1142                 }
1143         }
1144         bool has_changed = false;
1145
1146         for_all_symbols(i, sym) {
1147                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1148                         continue;
1149                 switch (sym_get_type(sym)) {
1150                 case S_BOOLEAN:
1151                 case S_TRISTATE:
1152                         has_changed = true;
1153                         switch (mode) {
1154                         case def_yes:
1155                                 sym->def[S_DEF_USER].tri = yes;
1156                                 break;
1157                         case def_mod:
1158                                 sym->def[S_DEF_USER].tri = mod;
1159                                 break;
1160                         case def_no:
1161                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1162                                         sym->def[S_DEF_USER].tri = yes;
1163                                 else
1164                                         sym->def[S_DEF_USER].tri = no;
1165                                 break;
1166                         case def_random:
1167                                 sym->def[S_DEF_USER].tri = no;
1168                                 cnt = rand() % 100;
1169                                 if (sym->type == S_TRISTATE) {
1170                                         if (cnt < pty)
1171                                                 sym->def[S_DEF_USER].tri = yes;
1172                                         else if (cnt < (pty+ptm))
1173                                                 sym->def[S_DEF_USER].tri = mod;
1174                                 } else if (cnt < pby)
1175                                         sym->def[S_DEF_USER].tri = yes;
1176                                 break;
1177                         default:
1178                                 continue;
1179                         }
1180                         if (!(sym_is_choice(sym) && mode == def_random))
1181                                 sym->flags |= SYMBOL_DEF_USER;
1182                         break;
1183                 default:
1184                         break;
1185                 }
1186
1187         }
1188
1189         sym_clear_all_valid();
1190
1191         /*
1192          * We have different type of choice blocks.
1193          * If curr.tri equals to mod then we can select several
1194          * choice symbols in one block.
1195          * In this case we do nothing.
1196          * If curr.tri equals yes then only one symbol can be
1197          * selected in a choice block and we set it to yes,
1198          * and the rest to no.
1199          */
1200         if (mode != def_random) {
1201                 for_all_symbols(i, csym) {
1202                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1203                             sym_is_choice_value(csym))
1204                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1205                 }
1206         }
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                         has_changed = randomize_choice_values(csym);
1215                 else {
1216                         set_all_choice_values(csym);
1217                         has_changed = true;
1218                 }
1219         }
1220
1221         return has_changed;
1222 }