scripts/config/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 static void conf_warning(const char *fmt, ...)
  20         __attribute__ ((format (printf, 1, 2)));
  21
  22 static void conf_message(const char *fmt, ...)
  23         __attribute__ ((format (printf, 1, 2)));
  24
  25 static const char *conf_filename;
  26 static int conf_lineno, conf_warnings, conf_unsaved;
  27
  28 const char conf_defname[] = "arch/$ARCH/defconfig";
  29
  30 static void conf_warning(const char *fmt, ...)
  31 {
  32         va_list ap;
  33         va_start(ap, fmt);
  34         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  35         vfprintf(stderr, fmt, ap);
  36         fprintf(stderr, "\n");
  37         va_end(ap);
  38         conf_warnings++;
  39 }
  40
  41 static void conf_default_message_callback(const char *fmt, va_list ap)
  42 {
  43         printf("#\n# ");
  44         vprintf(fmt, ap);
  45         printf("\n#\n");
  46 }
  47
  48 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  49         conf_default_message_callback;
  50 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  51 {
  52         conf_message_callback = fn;
  53 }
  54
  55 static void conf_message(const char *fmt, ...)
  56 {
  57         va_list ap;
  58
  59         va_start(ap, fmt);
  60         if (conf_message_callback)
  61                 conf_message_callback(fmt, ap);
  62 }
  63
  64 const char *conf_get_configname(void)
  65 {
  66         char *name = getenv("KCONFIG_CONFIG");
  67
  68         return name ? name : ".config";
  69 }
  70
  71 const char *conf_get_autoconfig_name(void)
  72 {
  73         char *name = getenv("KCONFIG_AUTOCONFIG");
  74
  75         return name ? name : "include/config/auto.conf";
  76 }
  77
  78 static char *conf_expand_value(const char *in)
  79 {
  80         struct symbol *sym;
  81         const char *src;
  82         static char res_value[SYMBOL_MAXLENGTH];
  83         char *dst, name[SYMBOL_MAXLENGTH];
  84
  85         res_value[0] = 0;
  86         dst = name;
  87         while ((src = strchr(in, '$'))) {
  88                 strncat(res_value, in, src - in);
  89                 src++;
  90                 dst = name;
  91                 while (isalnum(*src) || *src == '_')
  92                         *dst++ = *src++;
  93                 *dst = 0;
  94                 sym = sym_lookup(name, 0);
  95                 sym_calc_value(sym);
  96                 strcat(res_value, sym_get_string_value(sym));
  97                 in = src;
  98         }
  99         strcat(res_value, in);
 100
 101         return res_value;
 102 }
 103
 104 char *conf_get_default_confname(void)
 105 {
 106         struct stat buf;
 107         static char fullname[PATH_MAX+1];
 108         char *env, *name;
 109
 110         name = conf_expand_value(conf_defname);
 111         env = getenv(SRCTREE);
 112         if (env) {
 113                 sprintf(fullname, "%s/%s", env, name);
 114                 if (!stat(fullname, &buf))
 115                         return fullname;
 116         }
 117         return name;
 118 }
 119
 120 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 121 {
 122         char *p2;
 123
 124         switch (sym->type) {
 125         case S_TRISTATE:
 126                 if (p[0] == 'm') {
 127                         sym->def[def].tri = mod;
 128                         sym->flags |= def_flags;
 129                         break;
 130                 }
 131                 /* fall through */
 132         case S_BOOLEAN:
 133                 if (p[0] == 'y') {
 134                         sym->def[def].tri = yes;
 135                         sym->flags |= def_flags;
 136                         break;
 137                 }
 138                 if (p[0] == 'n') {
 139                         sym->def[def].tri = no;
 140                         sym->flags |= def_flags;
 141                         break;
 142                 }
 143                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 144                 return 1;
 145         case S_OTHER:
 146                 if (*p != '"') {
 147                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 148                                 ;
 149                         sym->type = S_STRING;
 150                         goto done;
 151                 }
 152                 /* fall through */
 153         case S_STRING:
 154                 if (*p++ != '"')
 155                         break;
 156                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 157                         if (*p2 == '"') {
 158                                 *p2 = 0;
 159                                 break;
 160                         }
 161                         memmove(p2, p2 + 1, strlen(p2));
 162                 }
 163                 if (!p2) {
 164                         conf_warning("invalid string found");
 165                         return 1;
 166                 }
 167                 /* fall through */
 168         case S_INT:
 169         case S_HEX:
 170         done:
 171                 if (sym_string_valid(sym, p)) {
 172                         sym->def[def].val = strdup(p);
 173                         sym->flags |= def_flags;
 174                 } else {
 175                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 176                         return 1;
 177                 }
 178                 break;
 179         default:
 180                 ;
 181         }
 182         return 0;
 183 }
 184
 185 #define LINE_GROWTH 16
 186 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 187 {
 188         char *nline;
 189         size_t new_size = slen + 1;
 190         if (new_size > *n) {
 191                 new_size += LINE_GROWTH - 1;
 192                 new_size *= 2;
 193                 nline = realloc(*lineptr, new_size);
 194                 if (!nline)
 195                         return -1;
 196
 197                 *lineptr = nline;
 198                 *n = new_size;
 199         }
 200
 201         (*lineptr)[slen] = c;
 202
 203         return 0;
 204 }
 205
 206 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 207 {
 208         char *line = *lineptr;
 209         size_t slen = 0;
 210
 211         for (;;) {
 212                 int c = getc(stream);
 213
 214                 switch (c) {
 215                 case '\n':
 216                         if (add_byte(c, &line, slen, n) < 0)
 217                                 goto e_out;
 218                         slen++;
 219                         /* fall through */
 220                 case EOF:
 221                         if (add_byte('\0', &line, slen, n) < 0)
 222                                 goto e_out;
 223                         *lineptr = line;
 224                         if (slen == 0)
 225                                 return -1;
 226                         return slen;
 227                 default:
 228                         if (add_byte(c, &line, slen, n) < 0)
 229                                 goto e_out;
 230                         slen++;
 231                 }
 232         }
 233
 234 e_out:
 235         line[slen-1] = '\0';
 236         *lineptr = line;
 237         return -1;
 238 }
 239
 240 void conf_reset(int def)
 241 {
 242         struct symbol *sym;
 243         int i, def_flags;
 244
 245         def_flags = SYMBOL_DEF << def;
 246         for_all_symbols(i, sym) {
 247                 sym->flags |= SYMBOL_CHANGED;
 248                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 249                 if (sym_is_choice(sym))
 250                         sym->flags |= def_flags;
 251                 switch (sym->type) {
 252                 case S_INT:
 253                 case S_HEX:
 254                 case S_STRING:
 255                         if (sym->def[def].val)
 256                                 free(sym->def[def].val);
 257                         /* fall through */
 258                 default:
 259                         sym->def[def].val = NULL;
 260                         sym->def[def].tri = no;
 261                 }
 262         }
 263 }
 264
 265 int conf_read_simple(const char *name, int def)
 266 {
 267         FILE *in = NULL;
 268         char   *line = NULL;
 269         size_t  line_asize = 0;
 270         char *p, *p2;
 271         struct symbol *sym;
 272         int def_flags;
 273
 274         if (name) {
 275                 in = zconf_fopen(name);
 276         } else {
 277                 struct property *prop;
 278
 279                 name = conf_get_configname();
 280                 in = zconf_fopen(name);
 281                 if (in)
 282                         goto load;
 283                 sym_add_change_count(1);
 284                 if (!sym_defconfig_list) {
 285                         if (modules_sym)
 286                                 sym_calc_value(modules_sym);
 287                         return 1;
 288                 }
 289
 290                 for_all_defaults(sym_defconfig_list, prop) {
 291                         if (expr_calc_value(prop->visible.expr) == no ||
 292                             prop->expr->type != E_SYMBOL)
 293                                 continue;
 294                         name = conf_expand_value(prop->expr->left.sym->name);
 295                         in = zconf_fopen(name);
 296                         if (in) {
 297                                 conf_message(_("using defaults found in %s"),
 298                                          name);
 299                                 goto load;
 300                         }
 301                 }
 302         }
 303         if (!in)
 304                 return 1;
 305
 306 load:
 307         conf_filename = name;
 308         conf_lineno = 0;
 309         conf_warnings = 0;
 310         conf_unsaved = 0;
 311
 312         def_flags = SYMBOL_DEF << def;
 313         conf_reset(def);
 314
 315         while (compat_getline(&line, &line_asize, in) != -1) {
 316                 conf_lineno++;
 317                 sym = NULL;
 318                 if (line[0] == '#') {
 319                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 320                                 continue;
 321                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 322                         if (!p)
 323                                 continue;
 324                         *p++ = 0;
 325                         if (strncmp(p, "is not set", 10))
 326                                 continue;
 327                         if (def == S_DEF_USER) {
 328                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 329                                 if (!sym) {
 330                                         sym_add_change_count(1);
 331                                         goto setsym;
 332                                 }
 333                         } else {
 334                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 335                                 if (sym->type == S_UNKNOWN)
 336                                         sym->type = S_BOOLEAN;
 337                         }
 338                         switch (sym->type) {
 339                         case S_BOOLEAN:
 340                         case S_TRISTATE:
 341                                 sym->def[def].tri = no;
 342                                 sym->flags |= def_flags;
 343                                 break;
 344                         default:
 345                                 ;
 346                         }
 347                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 348                         p = strchr(line + strlen(CONFIG_), '=');
 349                         if (!p)
 350                                 continue;
 351                         *p++ = 0;
 352                         p2 = strchr(p, '\n');
 353                         if (p2) {
 354                                 *p2-- = 0;
 355                                 if (*p2 == '\r')
 356                                         *p2 = 0;
 357                         }
 358                         if (def == S_DEF_USER) {
 359                                 sym = sym_find(line + strlen(CONFIG_));
 360                                 if (!sym) {
 361                                         sym_add_change_count(1);
 362                                         goto setsym;
 363                                 }
 364                         } else {
 365                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 366                                 if (sym->type == S_UNKNOWN)
 367                                         sym->type = S_OTHER;
 368                         }
 369                         if (conf_set_sym_val(sym, def, def_flags, p))
 370                                 continue;
 371                 } else {
 372                         if (line[0] != '\r' && line[0] != '\n')
 373                                 conf_warning("unexpected data");
 374                         continue;
 375                 }
 376 setsym:
 377                 if (sym && sym_is_choice_value(sym)) {
 378                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 379                         switch (sym->def[def].tri) {
 380                         case no:
 381                                 break;
 382                         case mod:
 383                                 if (cs->def[def].tri == yes) {
 384                                         conf_warning("%s creates inconsistent choice state", sym->name);
 385                                         cs->flags &= ~def_flags;
 386                                 }
 387                                 break;
 388                         case yes:
 389                                 if (cs->def[def].tri != no)
 390                                         conf_warning("override: %s changes choice state", sym->name);
 391                                 cs->def[def].val = sym;
 392                                 break;
 393                         }
 394                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 395                 }
 396         }
 397         free(line);
 398         fclose(in);
 399
 400         if (modules_sym)
 401                 sym_calc_value(modules_sym);
 402         return 0;
 403 }
 404
 405 int conf_read(const char *name)
 406 {
 407         struct symbol *sym;
 408         int i;
 409
 410         sym_set_change_count(0);
 411
 412         if (conf_read_simple(name, S_DEF_USER))
 413                 return 1;
 414
 415         for_all_symbols(i, sym) {
 416                 sym_calc_value(sym);
 417                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 418                         continue;
 419                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 420                         /* check that calculated value agrees with saved value */
 421                         switch (sym->type) {
 422                         case S_BOOLEAN:
 423                         case S_TRISTATE:
 424                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 425                                         break;
 426                                 if (!sym_is_choice(sym))
 427                                         continue;
 428                                 /* fall through */
 429                         default:
 430                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 431                                         continue;
 432                                 break;
 433                         }
 434                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 435                         /* no previous value and not saved */
 436                         continue;
 437                 conf_unsaved++;
 438                 /* maybe print value in verbose mode... */
 439         }
 440
 441         for_all_symbols(i, sym) {
 442                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 443                         /* Reset values of generates values, so they'll appear
 444                          * as new, if they should become visible, but that
 445                          * doesn't quite work if the Kconfig and the saved
 446                          * configuration disagree.
 447                          */
 448                         if (sym->visible == no && !conf_unsaved)
 449                                 sym->flags &= ~SYMBOL_DEF_USER;
 450                         switch (sym->type) {
 451                         case S_STRING:
 452                         case S_INT:
 453                         case S_HEX:
 454                                 /* Reset a string value if it's out of range */
 455                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 456                                         break;
 457                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 458                                 conf_unsaved++;
 459                                 break;
 460                         default:
 461                                 break;
 462                         }
 463                 }
 464         }
 465
 466         sym_add_change_count(conf_warnings || conf_unsaved);
 467
 468         return 0;
 469 }
 470
 471 /*
 472  * Kconfig configuration printer
 473  *
 474  * This printer is used when generating the resulting configuration after
 475  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 476  * passing a non-NULL argument to the printer.
 477  *
 478  */
 479 static void
 480 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 481 {
 482
 483         switch (sym->type) {
 484         case S_BOOLEAN:
 485         case S_TRISTATE:
 486                 if (*value == 'n') {
 487                         bool skip_unset = (arg != NULL);
 488
 489                         if (!skip_unset)
 490                                 fprintf(fp, "# %s%s is not set\n",
 491                                     CONFIG_, sym->name);
 492                         return;
 493                 }
 494                 break;
 495         default:
 496                 break;
 497         }
 498
 499         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 500 }
 501
 502 static void
 503 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 504 {
 505         const char *p = value;
 506         size_t l;
 507
 508         for (;;) {
 509                 l = strcspn(p, "\n");
 510                 fprintf(fp, "#");
 511                 if (l) {
 512                         fprintf(fp, " ");
 513                         xfwrite(p, l, 1, fp);
 514                         p += l;
 515                 }
 516                 fprintf(fp, "\n");
 517                 if (*p++ == '\0')
 518                         break;
 519         }
 520 }
 521
 522 static struct conf_printer kconfig_printer_cb =
 523 {
 524         .print_symbol = kconfig_print_symbol,
 525         .print_comment = kconfig_print_comment,
 526 };
 527
 528 /*
 529  * Header printer
 530  *
 531  * This printer is used when generating the `include/generated/autoconf.h' file.
 532  */
 533 static void
 534 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 535 {
 536
 537         switch (sym->type) {
 538         case S_BOOLEAN:
 539         case S_TRISTATE: {
 540                 const char *suffix = "";
 541
 542                 switch (*value) {
 543                 case 'n':
 544                         break;
 545                 case 'm':
 546                         suffix = "_MODULE";
 547                         /* fall through */
 548                 default:
 549                         fprintf(fp, "#define %s%s%s 1\n",
 550                             CONFIG_, sym->name, suffix);
 551                 }
 552                 break;
 553         }
 554         case S_HEX: {
 555                 const char *prefix = "";
 556
 557                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 558                         prefix = "0x";
 559                 fprintf(fp, "#define %s%s %s%s\n",
 560                     CONFIG_, sym->name, prefix, value);
 561                 break;
 562         }
 563         case S_STRING:
 564         case S_INT:
 565                 fprintf(fp, "#define %s%s %s\n",
 566                     CONFIG_, sym->name, value);
 567                 break;
 568         default:
 569                 break;
 570         }
 571
 572 }
 573
 574 static void
 575 header_print_comment(FILE *fp, const char *value, void *arg)
 576 {
 577         const char *p = value;
 578         size_t l;
 579
 580         fprintf(fp, "/*\n");
 581         for (;;) {
 582                 l = strcspn(p, "\n");
 583                 fprintf(fp, " *");
 584                 if (l) {
 585                         fprintf(fp, " ");
 586                         xfwrite(p, l, 1, fp);
 587                         p += l;
 588                 }
 589                 fprintf(fp, "\n");
 590                 if (*p++ == '\0')
 591                         break;
 592         }
 593         fprintf(fp, " */\n");
 594 }
 595
 596 static struct conf_printer header_printer_cb =
 597 {
 598         .print_symbol = header_print_symbol,
 599         .print_comment = header_print_comment,
 600 };
 601
 602 /*
 603  * Tristate printer
 604  *
 605  * This printer is used when generating the `include/config/tristate.conf' file.
 606  */
 607 static void
 608 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 609 {
 610
 611         if (sym->type == S_TRISTATE && *value != 'n')
 612                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 613 }
 614
 615 static struct conf_printer tristate_printer_cb =
 616 {
 617         .print_symbol = tristate_print_symbol,
 618         .print_comment = kconfig_print_comment,
 619 };
 620
 621 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 622                               struct conf_printer *printer, void *printer_arg)
 623 {
 624         const char *str;
 625
 626         switch (sym->type) {
 627         case S_OTHER:
 628         case S_UNKNOWN:
 629                 break;
 630         case S_STRING:
 631                 str = sym_get_string_value(sym);
 632                 str = sym_escape_string_value(str);
 633                 printer->print_symbol(fp, sym, str, printer_arg);
 634                 free((void *)str);
 635                 break;
 636         default:
 637                 str = sym_get_string_value(sym);
 638                 printer->print_symbol(fp, sym, str, printer_arg);
 639         }
 640 }
 641
 642 static void
 643 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 644 {
 645         char buf[256];
 646
 647         snprintf(buf, sizeof(buf),
 648             "\n"
 649             "Automatically generated file; DO NOT EDIT.\n"
 650             "%s\n",
 651             rootmenu.prompt->text);
 652
 653         printer->print_comment(fp, buf, printer_arg);
 654 }
 655
 656 /*
 657  * Write out a minimal config.
 658  * All values that has default values are skipped as this is redundant.
 659  */
 660 int conf_write_defconfig(const char *filename)
 661 {
 662         struct symbol *sym;
 663         struct menu *menu;
 664         FILE *out;
 665
 666         out = fopen(filename, "w");
 667         if (!out)
 668                 return 1;
 669
 670         sym_clear_all_valid();
 671
 672         /* Traverse all menus to find all relevant symbols */
 673         menu = rootmenu.list;
 674
 675         while (menu != NULL)
 676         {
 677                 sym = menu->sym;
 678                 if (sym == NULL) {
 679                         if (!menu_is_visible(menu))
 680                                 goto next_menu;
 681                 } else if (!sym_is_choice(sym)) {
 682                         sym_calc_value(sym);
 683                         if (!(sym->flags & SYMBOL_WRITE))
 684                                 goto next_menu;
 685                         sym->flags &= ~SYMBOL_WRITE;
 686                         /* If we cannot change the symbol - skip */
 687                         if (!sym_is_changable(sym))
 688                                 goto next_menu;
 689                         /* If symbol equals to default value - skip */
 690                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 691                                 goto next_menu;
 692
 693                         /*
 694                          * If symbol is a choice value and equals to the
 695                          * default for a choice - skip.
 696                          * But only if value is bool and equal to "y" and
 697                          * choice is not "optional".
 698                          * (If choice is "optional" then all values can be "n")
 699                          */
 700                         if (sym_is_choice_value(sym)) {
 701                                 struct symbol *cs;
 702                                 struct symbol *ds;
 703
 704                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 705                                 ds = sym_choice_default(cs);
 706                                 if (!sym_is_optional(cs) && sym == ds) {
 707                                         if ((sym->type == S_BOOLEAN) &&
 708                                             sym_get_tristate_value(sym) == yes)
 709                                                 goto next_menu;
 710                                 }
 711                         }
 712                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 713                 }
 714 next_menu:
 715                 if (menu->list != NULL) {
 716                         menu = menu->list;
 717                 }
 718                 else if (menu->next != NULL) {
 719                         menu = menu->next;
 720                 } else {
 721                         while ((menu = menu->parent)) {
 722                                 if (menu->next != NULL) {
 723                                         menu = menu->next;
 724                                         break;
 725                                 }
 726                         }
 727                 }
 728         }
 729         fclose(out);
 730         return 0;
 731 }
 732
 733 int conf_write(const char *name)
 734 {
 735         FILE *out;
 736         struct symbol *sym;
 737         struct menu *menu;
 738         const char *basename;
 739         const char *str;
 740         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 741         char *env;
 742
 743         dirname[0] = 0;
 744         if (name && name[0]) {
 745                 struct stat st;
 746                 char *slash;
 747
 748                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 749                         strcpy(dirname, name);
 750                         strcat(dirname, "/");
 751                         basename = conf_get_configname();
 752                 } else if ((slash = strrchr(name, '/'))) {
 753                         int size = slash - name + 1;
 754                         memcpy(dirname, name, size);
 755                         dirname[size] = 0;
 756                         if (slash[1])
 757                                 basename = slash + 1;
 758                         else
 759                                 basename = conf_get_configname();
 760                 } else
 761                         basename = name;
 762         } else
 763                 basename = conf_get_configname();
 764
 765         sprintf(newname, "%s%s", dirname, basename);
 766         env = getenv("KCONFIG_OVERWRITECONFIG");
 767         if (!env || !*env) {
 768                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 769                 out = fopen(tmpname, "w");
 770         } else {
 771                 *tmpname = 0;
 772                 out = fopen(newname, "w");
 773         }
 774         if (!out)
 775                 return 1;
 776
 777         conf_write_heading(out, &kconfig_printer_cb, NULL);
 778
 779         if (!conf_get_changed())
 780                 sym_clear_all_valid();
 781
 782         menu = rootmenu.list;
 783         while (menu) {
 784                 sym = menu->sym;
 785                 if (!sym) {
 786                         if (!menu_is_visible(menu))
 787                                 goto next;
 788                         str = menu_get_prompt(menu);
 789                         fprintf(out, "\n"
 790                                      "#\n"
 791                                      "# %s\n"
 792                                      "#\n", str);
 793                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 794                         sym_calc_value(sym);
 795                         if (!(sym->flags & SYMBOL_WRITE))
 796                                 goto next;
 797                         sym->flags &= ~SYMBOL_WRITE;
 798
 799                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 800                 }
 801
 802 next:
 803                 if (menu->list) {
 804                         menu = menu->list;
 805                         continue;
 806                 }
 807                 if (menu->next)
 808                         menu = menu->next;
 809                 else while ((menu = menu->parent)) {
 810                         if (menu->next) {
 811                                 menu = menu->next;
 812                                 break;
 813                         }
 814                 }
 815         }
 816         fclose(out);
 817
 818         if (*tmpname) {
 819                 strcat(dirname, basename);
 820                 strcat(dirname, ".old");
 821                 rename(newname, dirname);
 822                 if (rename(tmpname, newname))
 823                         return 1;
 824         }
 825
 826         conf_message(_("configuration written to %s"), newname);
 827
 828         sym_set_change_count(0);
 829
 830         return 0;
 831 }
 832
 833 static int conf_split_config(void)
 834 {
 835         const char *name;
 836         char path[PATH_MAX+1];
 837         char *s, *d, c;
 838         struct symbol *sym;
 839         struct stat sb;
 840         int res, i, fd;
 841
 842         name = conf_get_autoconfig_name();
 843         conf_read_simple(name, S_DEF_AUTO);
 844
 845         if (chdir("include/config"))
 846                 return 1;
 847
 848         res = 0;
 849         for_all_symbols(i, sym) {
 850                 sym_calc_value(sym);
 851                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 852                         continue;
 853                 if (sym->flags & SYMBOL_WRITE) {
 854                         if (sym->flags & SYMBOL_DEF_AUTO) {
 855                                 /*
 856                                  * symbol has old and new value,
 857                                  * so compare them...
 858                                  */
 859                                 switch (sym->type) {
 860                                 case S_BOOLEAN:
 861                                 case S_TRISTATE:
 862                                         if (sym_get_tristate_value(sym) ==
 863                                             sym->def[S_DEF_AUTO].tri)
 864                                                 continue;
 865                                         break;
 866                                 case S_STRING:
 867                                 case S_HEX:
 868                                 case S_INT:
 869                                         if (!strcmp(sym_get_string_value(sym),
 870                                                     sym->def[S_DEF_AUTO].val))
 871                                                 continue;
 872                                         break;
 873                                 default:
 874                                         break;
 875                                 }
 876                         } else {
 877                                 /*
 878                                  * If there is no old value, only 'no' (unset)
 879                                  * is allowed as new value.
 880                                  */
 881                                 switch (sym->type) {
 882                                 case S_BOOLEAN:
 883                                 case S_TRISTATE:
 884                                         if (sym_get_tristate_value(sym) == no)
 885                                                 continue;
 886                                         break;
 887                                 default:
 888                                         break;
 889                                 }
 890                         }
 891                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 892                         /* There is neither an old nor a new value. */
 893                         continue;
 894                 /* else
 895                  *      There is an old value, but no new value ('no' (unset)
 896                  *      isn't saved in auto.conf, so the old value is always
 897                  *      different from 'no').
 898                  */
 899
 900                 /* Replace all '_' and append ".h" */
 901                 s = sym->name;
 902                 d = path;
 903                 while ((c = *s++)) {
 904                         c = tolower(c);
 905                         *d++ = (c == '_') ? '/' : c;
 906                 }
 907                 strcpy(d, ".h");
 908
 909                 /* Assume directory path already exists. */
 910                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 911                 if (fd == -1) {
 912                         if (errno != ENOENT) {
 913                                 res = 1;
 914                                 break;
 915                         }
 916                         /*
 917                          * Create directory components,
 918                          * unless they exist already.
 919                          */
 920                         d = path;
 921                         while ((d = strchr(d, '/'))) {
 922                                 *d = 0;
 923                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 924                                         res = 1;
 925                                         goto out;
 926                                 }
 927                                 *d++ = '/';
 928                         }
 929                         /* Try it again. */
 930                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 931                         if (fd == -1) {
 932                                 res = 1;
 933                                 break;
 934                         }
 935                 }
 936                 close(fd);
 937         }
 938 out:
 939         if (chdir("../.."))
 940                 return 1;
 941
 942         return res;
 943 }
 944
 945 int conf_write_autoconf(void)
 946 {
 947         struct symbol *sym;
 948         const char *name;
 949         FILE *out, *tristate, *out_h;
 950         int i;
 951
 952         sym_clear_all_valid();
 953
 954         file_write_dep("include/config/auto.conf.cmd");
 955
 956         if (conf_split_config())
 957                 return 1;
 958
 959         out = fopen(".tmpconfig", "w");
 960         if (!out)
 961                 return 1;
 962
 963         tristate = fopen(".tmpconfig_tristate", "w");
 964         if (!tristate) {
 965                 fclose(out);
 966                 return 1;
 967         }
 968
 969         out_h = fopen(".tmpconfig.h", "w");
 970         if (!out_h) {
 971                 fclose(out);
 972                 fclose(tristate);
 973                 return 1;
 974         }
 975
 976         conf_write_heading(out, &kconfig_printer_cb, NULL);
 977
 978         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 979
 980         conf_write_heading(out_h, &header_printer_cb, NULL);
 981
 982         for_all_symbols(i, sym) {
 983                 sym_calc_value(sym);
 984                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 985                         continue;
 986
 987                 /* write symbol to auto.conf, tristate and header files */
 988                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 989
 990                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 991
 992                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 993         }
 994         fclose(out);
 995         fclose(tristate);
 996         fclose(out_h);
 997
 998         name = getenv("KCONFIG_AUTOHEADER");
 999         if (!name)
1000                 name = "include/generated/autoconf.h";
1001         if (rename(".tmpconfig.h", name))
1002                 return 1;
1003         name = getenv("KCONFIG_TRISTATE");
1004         if (!name)
1005                 name = "include/config/tristate.conf";
1006         if (rename(".tmpconfig_tristate", name))
1007                 return 1;
1008         name = conf_get_autoconfig_name();
1009         /*
1010          * This must be the last step, kbuild has a dependency on auto.conf
1011          * and this marks the successful completion of the previous steps.
1012          */
1013         if (rename(".tmpconfig", name))
1014                 return 1;
1015
1016         return 0;
1017 }
1018
1019 static int sym_change_count;
1020 static void (*conf_changed_callback)(void);
1021
1022 void sym_set_change_count(int count)
1023 {
1024         int _sym_change_count = sym_change_count;
1025         sym_change_count = count;
1026         if (conf_changed_callback &&
1027             (bool)_sym_change_count != (bool)count)
1028                 conf_changed_callback();
1029 }
1030
1031 void sym_add_change_count(int count)
1032 {
1033         sym_set_change_count(count + sym_change_count);
1034 }
1035
1036 bool conf_get_changed(void)
1037 {
1038         return sym_change_count;
1039 }
1040
1041 void conf_set_changed_callback(void (*fn)(void))
1042 {
1043         conf_changed_callback = fn;
1044 }
1045
1046 static void randomize_choice_values(struct symbol *csym)
1047 {
1048         struct property *prop;
1049         struct symbol *sym;
1050         struct expr *e;
1051         int cnt, def;
1052
1053         /*
1054          * If choice is mod then we may have more items selected
1055          * and if no then no-one.
1056          * In both cases stop.
1057          */
1058         if (csym->curr.tri != yes)
1059                 return;
1060
1061         prop = sym_get_choice_prop(csym);
1062
1063         /* count entries in choice block */
1064         cnt = 0;
1065         expr_list_for_each_sym(prop->expr, e, sym)
1066                 cnt++;
1067
1068         /*
1069          * find a random value and set it to yes,
1070          * set the rest to no so we have only one set
1071          */
1072         def = (rand() % cnt);
1073
1074         cnt = 0;
1075         expr_list_for_each_sym(prop->expr, e, sym) {
1076                 if (def == cnt++) {
1077                         sym->def[S_DEF_USER].tri = yes;
1078                         csym->def[S_DEF_USER].val = sym;
1079                 }
1080                 else {
1081                         sym->def[S_DEF_USER].tri = no;
1082                 }
1083         }
1084         csym->flags |= SYMBOL_DEF_USER;
1085         /* clear VALID to get value calculated */
1086         csym->flags &= ~(SYMBOL_VALID);
1087 }
1088
1089 static void set_all_choice_values(struct symbol *csym)
1090 {
1091         struct property *prop;
1092         struct symbol *sym;
1093         struct expr *e;
1094
1095         prop = sym_get_choice_prop(csym);
1096
1097         /*
1098          * Set all non-assinged choice values to no
1099          */
1100         expr_list_for_each_sym(prop->expr, e, sym) {
1101                 if (!sym_has_value(sym))
1102                         sym->def[S_DEF_USER].tri = no;
1103         }
1104         csym->flags |= SYMBOL_DEF_USER;
1105         /* clear VALID to get value calculated */
1106         csym->flags &= ~(SYMBOL_VALID);
1107 }
1108
1109 void conf_set_all_new_symbols(enum conf_def_mode mode)
1110 {
1111         struct symbol *sym, *csym;
1112         int i, cnt;
1113
1114         for_all_symbols(i, sym) {
1115                 if (sym_has_value(sym))
1116                         continue;
1117                 switch (sym_get_type(sym)) {
1118                 case S_BOOLEAN:
1119                 case S_TRISTATE:
1120                         switch (mode) {
1121                         case def_yes:
1122                                 sym->def[S_DEF_USER].tri = yes;
1123                                 break;
1124                         case def_mod:
1125                                 sym->def[S_DEF_USER].tri = mod;
1126                                 break;
1127                         case def_no:
1128                                 sym->def[S_DEF_USER].tri = no;
1129                                 break;
1130                         case def_random:
1131                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1132                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1133                                 break;
1134                         default:
1135                                 continue;
1136                         }
1137                         if (!(sym_is_choice(sym) && mode == def_random))
1138                                 sym->flags |= SYMBOL_DEF_USER;
1139                         break;
1140                 default:
1141                         break;
1142                 }
1143
1144         }
1145
1146         sym_clear_all_valid();
1147
1148         /*
1149          * We have different type of choice blocks.
1150          * If curr.tri equals to mod then we can select several
1151          * choice symbols in one block.
1152          * In this case we do nothing.
1153          * If curr.tri equals yes then only one symbol can be
1154          * selected in a choice block and we set it to yes,
1155          * and the rest to no.
1156          */
1157         for_all_symbols(i, csym) {
1158                 if (sym_has_value(csym) || !sym_is_choice(csym))
1159                         continue;
1160
1161                 sym_calc_value(csym);
1162                 if (mode == def_random)
1163                         randomize_choice_values(csym);
1164                 else
1165                         set_all_choice_values(csym);
1166         }
1167 }