scripts/kconfig/confdata.c

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