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 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, conf_unsaved;
  32
  33 const char conf_defname[] = "include/generated/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/generated/auto.conf";
  82 }
  83
  84 static char *conf_expand_value(const char *in)
  85 {
  86         struct symbol *sym;
  87         const char *src;
  88         static char res_value[SYMBOL_MAXLENGTH];
  89         char *dst, name[SYMBOL_MAXLENGTH];
  90
  91         res_value[0] = 0;
  92         dst = name;
  93         while ((src = strchr(in, '$'))) {
  94                 strncat(res_value, in, src - in);
  95                 src++;
  96                 dst = name;
  97                 while (isalnum(*src) || *src == '_')
  98                         *dst++ = *src++;
  99                 *dst = 0;
 100                 sym = sym_lookup(name, 0);
 101                 sym_calc_value(sym);
 102                 strcat(res_value, sym_get_string_value(sym));
 103                 in = src;
 104         }
 105         strcat(res_value, in);
 106
 107         return res_value;
 108 }
 109
 110 char *conf_get_default_confname(void)
 111 {
 112         struct stat buf;
 113         static char fullname[PATH_MAX+1];
 114         char *env, *name;
 115
 116         name = conf_expand_value(conf_defname);
 117         env = getenv(SRCTREE);
 118         if (env) {
 119                 sprintf(fullname, "%s/%s", env, name);
 120                 if (!stat(fullname, &buf))
 121                         return fullname;
 122         }
 123         return name;
 124 }
 125
 126 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 127 {
 128         char *p2;
 129
 130         switch (sym->type) {
 131         case S_TRISTATE:
 132                 if (p[0] == 'm') {
 133                         sym->def[def].tri = mod;
 134                         sym->flags |= def_flags;
 135                         break;
 136                 }
 137                 /* fall through */
 138         case S_BOOLEAN:
 139                 if (p[0] == 'y') {
 140                         sym->def[def].tri = yes;
 141                         sym->flags |= def_flags;
 142                         break;
 143                 }
 144                 if (p[0] == 'n') {
 145                         sym->def[def].tri = no;
 146                         sym->flags |= def_flags;
 147                         break;
 148                 }
 149                 if (def != S_DEF_AUTO)
 150                         conf_warning("symbol value '%s' invalid for %s",
 151                                      p, sym->name);
 152                 return 1;
 153         case S_OTHER:
 154                 if (*p != '"') {
 155                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 156                                 ;
 157                         sym->type = S_STRING;
 158                         goto done;
 159                 }
 160                 /* fall through */
 161         case S_STRING:
 162                 if (*p++ != '"')
 163                         break;
 164                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 165                         if (*p2 == '"') {
 166                                 *p2 = 0;
 167                                 break;
 168                         }
 169                         memmove(p2, p2 + 1, strlen(p2));
 170                 }
 171                 if (!p2) {
 172                         if (def != S_DEF_AUTO)
 173                                 conf_warning("invalid string found");
 174                         return 1;
 175                 }
 176                 /* fall through */
 177         case S_INT:
 178         case S_HEX:
 179         done:
 180                 if (sym_string_valid(sym, p)) {
 181                         sym->def[def].val = strdup(p);
 182                         sym->flags |= def_flags;
 183                 } else {
 184                         if (def != S_DEF_AUTO)
 185                                 conf_warning("symbol value '%s' invalid for %s",
 186                                              p, sym->name);
 187                         return 1;
 188                 }
 189                 break;
 190         default:
 191                 ;
 192         }
 193         return 0;
 194 }
 195
 196 #define LINE_GROWTH 16
 197 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 198 {
 199         char *nline;
 200         size_t new_size = slen + 1;
 201         if (new_size > *n) {
 202                 new_size += LINE_GROWTH - 1;
 203                 new_size *= 2;
 204                 nline = realloc(*lineptr, new_size);
 205                 if (!nline)
 206                         return -1;
 207
 208                 *lineptr = nline;
 209                 *n = new_size;
 210         }
 211
 212         (*lineptr)[slen] = c;
 213
 214         return 0;
 215 }
 216
 217 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 218 {
 219         char *line = *lineptr;
 220         size_t slen = 0;
 221
 222         for (;;) {
 223                 int c = getc(stream);
 224
 225                 switch (c) {
 226                 case '\n':
 227                         if (add_byte(c, &line, slen, n) < 0)
 228                                 goto e_out;
 229                         slen++;
 230                         /* fall through */
 231                 case EOF:
 232                         if (add_byte('\0', &line, slen, n) < 0)
 233                                 goto e_out;
 234                         *lineptr = line;
 235                         if (slen == 0)
 236                                 return -1;
 237                         return slen;
 238                 default:
 239                         if (add_byte(c, &line, slen, n) < 0)
 240                                 goto e_out;
 241                         slen++;
 242                 }
 243         }
 244
 245 e_out:
 246         line[slen-1] = '\0';
 247         *lineptr = line;
 248         return -1;
 249 }
 250
 251 int conf_read_simple(const char *name, int def)
 252 {
 253         FILE *in = NULL;
 254         char   *line = NULL;
 255         size_t  line_asize = 0;
 256         char *p, *p2;
 257         struct symbol *sym;
 258         int i, def_flags;
 259
 260         if (name) {
 261                 in = zconf_fopen(name);
 262         } else {
 263                 struct property *prop;
 264
 265                 name = conf_get_configname();
 266                 in = zconf_fopen(name);
 267                 if (in)
 268                         goto load;
 269                 sym_add_change_count(1);
 270                 if (!sym_defconfig_list)
 271                         return 1;
 272
 273                 for_all_defaults(sym_defconfig_list, prop) {
 274                         if (expr_calc_value(prop->visible.expr) == no ||
 275                             prop->expr->type != E_SYMBOL)
 276                                 continue;
 277                         name = conf_expand_value(prop->expr->left.sym->name);
 278                         in = zconf_fopen(name);
 279                         if (in) {
 280                                 conf_message(_("using defaults found in %s"),
 281                                          name);
 282                                 goto load;
 283                         }
 284                 }
 285         }
 286         if (!in)
 287                 return 1;
 288
 289 load:
 290         conf_filename = name;
 291         conf_lineno = 0;
 292         conf_warnings = 0;
 293         conf_unsaved = 0;
 294
 295         def_flags = SYMBOL_DEF << def;
 296         for_all_symbols(i, sym) {
 297                 sym->flags |= SYMBOL_CHANGED;
 298                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 299                 if (sym_is_choice(sym))
 300                         sym->flags |= def_flags;
 301                 switch (sym->type) {
 302                 case S_INT:
 303                 case S_HEX:
 304                 case S_STRING:
 305                         if (sym->def[def].val)
 306                                 free(sym->def[def].val);
 307                         /* fall through */
 308                 default:
 309                         sym->def[def].val = NULL;
 310                         sym->def[def].tri = no;
 311                 }
 312         }
 313
 314         while (compat_getline(&line, &line_asize, in) != -1) {
 315                 conf_lineno++;
 316                 sym = NULL;
 317                 if (line[0] == '#') {
 318                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 319                                 continue;
 320                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 321                         if (!p)
 322                                 continue;
 323                         *p++ = 0;
 324                         if (strncmp(p, "is not set", 10))
 325                                 continue;
 326                         if (def == S_DEF_USER) {
 327                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 328                                 if (!sym) {
 329                                         sym_add_change_count(1);
 330                                         goto setsym;
 331                                 }
 332                         } else {
 333                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 334                                 if (sym->type == S_UNKNOWN)
 335                                         sym->type = S_BOOLEAN;
 336                         }
 337                         if (sym->flags & def_flags) {
 338                                 conf_warning("override: reassigning to symbol %s", sym->name);
 339                         }
 340                         switch (sym->type) {
 341                         case S_BOOLEAN:
 342                         case S_TRISTATE:
 343                                 sym->def[def].tri = no;
 344                                 sym->flags |= def_flags;
 345                                 break;
 346                         default:
 347                                 ;
 348                         }
 349                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 350                         p = strchr(line + strlen(CONFIG_), '=');
 351                         if (!p)
 352                                 continue;
 353                         *p++ = 0;
 354                         p2 = strchr(p, '\n');
 355                         if (p2) {
 356                                 *p2-- = 0;
 357                                 if (*p2 == '\r')
 358                                         *p2 = 0;
 359                         }
 360                         if (def == S_DEF_USER) {
 361                                 sym = sym_find(line + strlen(CONFIG_));
 362                                 if (!sym) {
 363                                         sym_add_change_count(1);
 364                                         goto setsym;
 365                                 }
 366                         } else {
 367                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 368                                 if (sym->type == S_UNKNOWN)
 369                                         sym->type = S_OTHER;
 370                         }
 371                         if (sym->flags & def_flags) {
 372                                 conf_warning("override: reassigning to symbol %s", sym->name);
 373                         }
 374                         if (conf_set_sym_val(sym, def, def_flags, p))
 375                                 continue;
 376                 } else {
 377                         if (line[0] != '\r' && line[0] != '\n')
 378                                 conf_warning("unexpected data: %.*s",
 379                                              (int)strcspn(line, "\r\n"), line);
 380
 381                         continue;
 382                 }
 383 setsym:
 384                 if (sym && sym_is_choice_value(sym)) {
 385                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 386                         switch (sym->def[def].tri) {
 387                         case no:
 388                                 break;
 389                         case mod:
 390                                 if (cs->def[def].tri == yes) {
 391                                         conf_warning("%s creates inconsistent choice state", sym->name);
 392                                         cs->flags &= ~def_flags;
 393                                 }
 394                                 break;
 395                         case yes:
 396                                 if (cs->def[def].tri != no)
 397                                         conf_warning("override: %s changes choice state", sym->name);
 398                                 cs->def[def].val = sym;
 399                                 break;
 400                         }
 401                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 402                 }
 403         }
 404         free(line);
 405         fclose(in);
 406         return 0;
 407 }
 408
 409 int conf_read(const char *name)
 410 {
 411         struct symbol *sym;
 412         int i;
 413
 414         sym_set_change_count(0);
 415
 416         if (conf_read_simple(name, S_DEF_USER)) {
 417                 sym_calc_value(modules_sym);
 418                 return 1;
 419         }
 420
 421         sym_calc_value(modules_sym);
 422
 423         for_all_symbols(i, sym) {
 424                 sym_calc_value(sym);
 425                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 426                         continue;
 427                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 428                         /* check that calculated value agrees with saved value */
 429                         switch (sym->type) {
 430                         case S_BOOLEAN:
 431                         case S_TRISTATE:
 432                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 433                                         break;
 434                                 if (!sym_is_choice(sym))
 435                                         continue;
 436                                 /* fall through */
 437                         default:
 438                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 439                                         continue;
 440                                 break;
 441                         }
 442                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 443                         /* no previous value and not saved */
 444                         continue;
 445                 conf_unsaved++;
 446                 /* maybe print value in verbose mode... */
 447         }
 448
 449         for_all_symbols(i, sym) {
 450                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 451                         /* Reset values of generates values, so they'll appear
 452                          * as new, if they should become visible, but that
 453                          * doesn't quite work if the Kconfig and the saved
 454                          * configuration disagree.
 455                          */
 456                         if (sym->visible == no && !conf_unsaved)
 457                                 sym->flags &= ~SYMBOL_DEF_USER;
 458                         switch (sym->type) {
 459                         case S_STRING:
 460                         case S_INT:
 461                         case S_HEX:
 462                                 /* Reset a string value if it's out of range */
 463                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 464                                         break;
 465                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 466                                 conf_unsaved++;
 467                                 break;
 468                         default:
 469                                 break;
 470                         }
 471                 }
 472         }
 473
 474         sym_add_change_count(conf_warnings || conf_unsaved);
 475
 476         return 0;
 477 }
 478
 479 /*
 480  * Kconfig configuration printer
 481  *
 482  * This printer is used when generating the resulting configuration after
 483  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 484  * passing a non-NULL argument to the printer.
 485  *
 486  */
 487 static void
 488 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 489 {
 490
 491         switch (sym->type) {
 492         case S_BOOLEAN:
 493         case S_TRISTATE:
 494                 if (*value == 'n') {
 495                         bool skip_unset = (arg != NULL);
 496
 497                         if (!skip_unset)
 498                                 fprintf(fp, "# %s%s is not set\n",
 499                                     CONFIG_, sym->name);
 500                         return;
 501                 }
 502                 break;
 503         default:
 504                 break;
 505         }
 506
 507         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 508 }
 509
 510 static void
 511 kconfig_print_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 512 {
 513
 514         switch (sym->type) {
 515         case S_BOOLEAN:
 516         case S_TRISTATE:
 517                 if (*value == 'n') {
 518                         bool skip_unset = (arg != NULL);
 519
 520                         if (!skip_unset)
 521                                 fprintf(fp, "set(%s%s false)\n",
 522                                         CONFIG_, sym->name, value);
 523                         return;
 524                 } else if (*value == 'm') {
 525                         abort();
 526                 } else {
 527                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 528                 }
 529                 break;
 530         case S_HEX: {
 531                 const char *prefix = "";
 532
 533                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 534                         prefix = "0x";
 535                 fprintf(fp, "set(%s%s %s%s)\n",
 536                     CONFIG_, sym->name, prefix, value);
 537                 break;
 538         }
 539         case S_STRING:
 540         case S_INT:
 541                 fprintf(fp, "set(%s%s %s)\n",
 542                     CONFIG_, sym->name, value);
 543                 break;
 544         default:
 545                 break;
 546         }
 547
 548 }
 549
 550 static void
 551 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 552 {
 553         const char *p = value;
 554         size_t l;
 555
 556         for (;;) {
 557                 l = strcspn(p, "\n");
 558                 fprintf(fp, "#");
 559                 if (l) {
 560                         fprintf(fp, " ");
 561                         xfwrite(p, l, 1, fp);
 562                         p += l;
 563                 }
 564                 fprintf(fp, "\n");
 565                 if (*p++ == '\0')
 566                         break;
 567         }
 568 }
 569
 570 static struct conf_printer kconfig_printer_cb =
 571 {
 572         .print_symbol = kconfig_print_symbol,
 573         .print_comment = kconfig_print_comment,
 574 };
 575
 576 static struct conf_printer kconfig_printer_cmake_cb =
 577 {
 578         .print_symbol = kconfig_print_cmake_symbol,
 579         .print_comment = kconfig_print_comment,
 580 };
 581
 582 /*
 583  * Header printer
 584  *
 585  * This printer is used when generating the `include/generated/autoconf.h' file.
 586  */
 587 static void
 588 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 589 {
 590
 591         switch (sym->type) {
 592         case S_BOOLEAN:
 593         case S_TRISTATE: {
 594                 const char *suffix = "";
 595
 596                 switch (*value) {
 597                 case 'n':
 598                         break;
 599                 case 'm':
 600                         suffix = "_MODULE";
 601                         /* fall through */
 602                 default:
 603                         fprintf(fp, "#define %s%s%s 1\n",
 604                             CONFIG_, sym->name, suffix);
 605                 }
 606                 break;
 607         }
 608         case S_HEX: {
 609                 const char *prefix = "";
 610
 611                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 612                         prefix = "0x";
 613                 fprintf(fp, "#define %s%s %s%s\n",
 614                     CONFIG_, sym->name, prefix, value);
 615                 break;
 616         }
 617         case S_STRING:
 618         case S_INT:
 619                 fprintf(fp, "#define %s%s %s\n",
 620                     CONFIG_, sym->name, value);
 621                 break;
 622         default:
 623                 break;
 624         }
 625
 626 }
 627
 628 static void
 629 header_print_comment(FILE *fp, const char *value, void *arg)
 630 {
 631         const char *p = value;
 632         size_t l;
 633
 634         fprintf(fp, "/*\n");
 635         for (;;) {
 636                 l = strcspn(p, "\n");
 637                 fprintf(fp, " *");
 638                 if (l) {
 639                         fprintf(fp, " ");
 640                         xfwrite(p, l, 1, fp);
 641                         p += l;
 642                 }
 643                 fprintf(fp, "\n");
 644                 if (*p++ == '\0')
 645                         break;
 646         }
 647         fprintf(fp, " */\n");
 648 }
 649
 650 static struct conf_printer header_printer_cb =
 651 {
 652         .print_symbol = header_print_symbol,
 653         .print_comment = header_print_comment,
 654 };
 655
 656 /*
 657  * Tristate printer
 658  *
 659  * This printer is used when generating the `include/generated/tristate.conf' file.
 660  */
 661 static void
 662 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 663 {
 664
 665         if (sym->type == S_TRISTATE && *value != 'n')
 666                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 667 }
 668
 669 static struct conf_printer tristate_printer_cb =
 670 {
 671         .print_symbol = tristate_print_symbol,
 672         .print_comment = kconfig_print_comment,
 673 };
 674
 675 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 676                               struct conf_printer *printer, void *printer_arg)
 677 {
 678         const char *str;
 679
 680         switch (sym->type) {
 681         case S_OTHER:
 682         case S_UNKNOWN:
 683                 break;
 684         case S_STRING:
 685                 str = sym_get_string_value(sym);
 686                 str = sym_escape_string_value(str);
 687                 printer->print_symbol(fp, sym, str, printer_arg);
 688                 free((void *)str);
 689                 break;
 690         default:
 691                 str = sym_get_string_value(sym);
 692                 printer->print_symbol(fp, sym, str, printer_arg);
 693         }
 694 }
 695
 696 static void
 697 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 698 {
 699         char buf[256];
 700
 701         snprintf(buf, sizeof(buf),
 702             "\n"
 703             "Automatically generated file; DO NOT EDIT.\n"
 704             "%s\n",
 705             rootmenu.prompt->text);
 706
 707         printer->print_comment(fp, buf, printer_arg);
 708 }
 709
 710 /*
 711  * Write out a minimal config.
 712  * All values that has default values are skipped as this is redundant.
 713  */
 714 int conf_write_defconfig(const char *filename)
 715 {
 716         struct symbol *sym;
 717         struct menu *menu;
 718         FILE *out;
 719
 720         out = fopen(filename, "w");
 721         if (!out)
 722                 return 1;
 723
 724         sym_clear_all_valid();
 725
 726         /* Traverse all menus to find all relevant symbols */
 727         menu = rootmenu.list;
 728
 729         while (menu != NULL)
 730         {
 731                 sym = menu->sym;
 732                 if (sym == NULL) {
 733                         if (!menu_is_visible(menu))
 734                                 goto next_menu;
 735                 } else if (!sym_is_choice(sym)) {
 736                         sym_calc_value(sym);
 737                         if (!(sym->flags & SYMBOL_WRITE))
 738                                 goto next_menu;
 739                         sym->flags &= ~SYMBOL_WRITE;
 740                         /* If we cannot change the symbol - skip */
 741                         if (!sym_is_changable(sym))
 742                                 goto next_menu;
 743                         /* If symbol equals to default value - skip */
 744                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 745                                 goto next_menu;
 746
 747                         /*
 748                          * If symbol is a choice value and equals to the
 749                          * default for a choice - skip.
 750                          * But only if value is bool and equal to "y" and
 751                          * choice is not "optional".
 752                          * (If choice is "optional" then all values can be "n")
 753                          */
 754                         if (sym_is_choice_value(sym)) {
 755                                 struct symbol *cs;
 756                                 struct symbol *ds;
 757
 758                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 759                                 ds = sym_choice_default(cs);
 760                                 if (!sym_is_optional(cs) && sym == ds) {
 761                                         if ((sym->type == S_BOOLEAN) &&
 762                                             sym_get_tristate_value(sym) == yes)
 763                                                 goto next_menu;
 764                                 }
 765                         }
 766                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 767                 }
 768 next_menu:
 769                 if (menu->list != NULL) {
 770                         menu = menu->list;
 771                 }
 772                 else if (menu->next != NULL) {
 773                         menu = menu->next;
 774                 } else {
 775                         while ((menu = menu->parent)) {
 776                                 if (menu->next != NULL) {
 777                                         menu = menu->next;
 778                                         break;
 779                                 }
 780                         }
 781                 }
 782         }
 783         fclose(out);
 784         return 0;
 785 }
 786
 787 int conf_write(const char *name)
 788 {
 789         FILE *out;
 790         struct symbol *sym;
 791         struct menu *menu;
 792         const char *basename;
 793         const char *str;
 794         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 795         char *env;
 796
 797         dirname[0] = 0;
 798         if (name && name[0]) {
 799                 struct stat st;
 800                 char *slash;
 801
 802                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 803                         strcpy(dirname, name);
 804                         strcat(dirname, "/");
 805                         basename = conf_get_configname();
 806                 } else if ((slash = strrchr(name, '/'))) {
 807                         int size = slash - name + 1;
 808                         memcpy(dirname, name, size);
 809                         dirname[size] = 0;
 810                         if (slash[1])
 811                                 basename = slash + 1;
 812                         else
 813                                 basename = conf_get_configname();
 814                 } else
 815                         basename = name;
 816         } else
 817                 basename = conf_get_configname();
 818
 819         sprintf(newname, "%s%s", dirname, basename);
 820         env = getenv("KCONFIG_OVERWRITECONFIG");
 821         if (!env || !*env) {
 822                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 823                 out = fopen(tmpname, "w");
 824         } else {
 825                 *tmpname = 0;
 826                 out = fopen(newname, "w");
 827         }
 828         if (!out)
 829                 return 1;
 830
 831         conf_write_heading(out, &kconfig_printer_cb, NULL);
 832
 833         if (!conf_get_changed())
 834                 sym_clear_all_valid();
 835
 836         menu = rootmenu.list;
 837         while (menu) {
 838                 sym = menu->sym;
 839                 if (!sym) {
 840                         if (!menu_is_visible(menu))
 841                                 goto next;
 842                         str = menu_get_prompt(menu);
 843                         fprintf(out, "\n"
 844                                      "#\n"
 845                                      "# %s\n"
 846                                      "#\n", str);
 847                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 848                         sym_calc_value(sym);
 849                         if (!(sym->flags & SYMBOL_WRITE))
 850                                 goto next;
 851                         sym->flags &= ~SYMBOL_WRITE;
 852
 853                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 854                 }
 855
 856 next:
 857                 if (menu->list) {
 858                         menu = menu->list;
 859                         continue;
 860                 }
 861                 if (menu->next)
 862                         menu = menu->next;
 863                 else while ((menu = menu->parent)) {
 864                         if (menu->next) {
 865                                 menu = menu->next;
 866                                 break;
 867                         }
 868                 }
 869         }
 870         fclose(out);
 871
 872         if (*tmpname) {
 873                 strcat(dirname, basename);
 874                 strcat(dirname, ".old");
 875                 rename(newname, dirname);
 876                 if (rename(tmpname, newname))
 877                         return 1;
 878         }
 879
 880         conf_message(_("configuration written to %s"), newname);
 881
 882         sym_set_change_count(0);
 883
 884         return 0;
 885 }
 886
 887 static int conf_split_config(void)
 888 {
 889         const char *name;
 890         char path[PATH_MAX+1];
 891         char *s, *d, c;
 892         struct symbol *sym;
 893         struct stat sb;
 894         int res, i, fd;
 895
 896         name = conf_get_autoconfig_name();
 897         conf_read_simple(name, S_DEF_AUTO);
 898         sym_calc_value(modules_sym);
 899
 900         if (chdir("include/generated"))
 901                 return 1;
 902
 903         res = 0;
 904         for_all_symbols(i, sym) {
 905                 sym_calc_value(sym);
 906                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 907                         continue;
 908                 if (sym->flags & SYMBOL_WRITE) {
 909                         if (sym->flags & SYMBOL_DEF_AUTO) {
 910                                 /*
 911                                  * symbol has old and new value,
 912                                  * so compare them...
 913                                  */
 914                                 switch (sym->type) {
 915                                 case S_BOOLEAN:
 916                                 case S_TRISTATE:
 917                                         if (sym_get_tristate_value(sym) ==
 918                                             sym->def[S_DEF_AUTO].tri)
 919                                                 continue;
 920                                         break;
 921                                 case S_STRING:
 922                                 case S_HEX:
 923                                 case S_INT:
 924                                         if (!strcmp(sym_get_string_value(sym),
 925                                                     sym->def[S_DEF_AUTO].val))
 926                                                 continue;
 927                                         break;
 928                                 default:
 929                                         break;
 930                                 }
 931                         } else {
 932                                 /*
 933                                  * If there is no old value, only 'no' (unset)
 934                                  * is allowed as new value.
 935                                  */
 936                                 switch (sym->type) {
 937                                 case S_BOOLEAN:
 938                                 case S_TRISTATE:
 939                                         if (sym_get_tristate_value(sym) == no)
 940                                                 continue;
 941                                         break;
 942                                 default:
 943                                         break;
 944                                 }
 945                         }
 946                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 947                         /* There is neither an old nor a new value. */
 948                         continue;
 949                 /* else
 950                  *      There is an old value, but no new value ('no' (unset)
 951                  *      isn't saved in auto.conf, so the old value is always
 952                  *      different from 'no').
 953                  */
 954
 955                 /* Replace all '_' and append ".h" */
 956                 s = sym->name;
 957                 d = path;
 958                 while ((c = *s++)) {
 959                         c = tolower(c);
 960                         *d++ = (c == '_') ? '/' : c;
 961                 }
 962                 strcpy(d, ".h");
 963
 964                 /* Assume directory path already exists. */
 965                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 966                 if (fd == -1) {
 967                         if (errno != ENOENT) {
 968                                 res = 1;
 969                                 break;
 970                         }
 971                         /*
 972                          * Create directory components,
 973                          * unless they exist already.
 974                          */
 975                         d = path;
 976                         while ((d = strchr(d, '/'))) {
 977                                 *d = 0;
 978                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 979                                         res = 1;
 980                                         goto out;
 981                                 }
 982                                 *d++ = '/';
 983                         }
 984                         /* Try it again. */
 985                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 986                         if (fd == -1) {
 987                                 res = 1;
 988                                 break;
 989                         }
 990                 }
 991                 close(fd);
 992         }
 993 out:
 994         if (chdir("../.."))
 995                 return 1;
 996
 997         return res;
 998 }
 999
1000 int conf_write_autoconf(void)
1001 {
1002         struct symbol *sym;
1003         const char *name;
1004         FILE *out, *tristate, *out_h, *out_c;
1005         int i;
1006
1007         sym_clear_all_valid();
1008
1009         file_write_dep("include/generated/auto.conf.cmd");
1010
1011         if (conf_split_config())
1012                 return 1;
1013
1014         out = fopen(".tmpconfig", "w");
1015         if (!out)
1016                 return 1;
1017
1018         tristate = fopen(".tmpconfig_tristate", "w");
1019         if (!tristate) {
1020                 fclose(out);
1021                 return 1;
1022         }
1023
1024         out_h = fopen(".tmpconfig.h", "w");
1025         if (!out_h) {
1026                 fclose(out);
1027                 fclose(tristate);
1028                 return 1;
1029         }
1030
1031         out_c = fopen(".tmpconfig.cmake", "w");
1032         if (!out_c) {
1033                 fclose(out);
1034                 fclose(tristate);
1035                 fclose(out_h);
1036         }
1037
1038         conf_write_heading(out, &kconfig_printer_cb, NULL);
1039
1040         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1041
1042         conf_write_heading(out_h, &header_printer_cb, NULL);
1043
1044         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1045
1046         for_all_symbols(i, sym) {
1047                 sym_calc_value(sym);
1048                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1049                         continue;
1050
1051                 /* write symbol to auto.conf, tristate and header files */
1052                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1053
1054                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1055
1056                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1057
1058                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1059         }
1060         fclose(out);
1061         fclose(tristate);
1062         fclose(out_h);
1063         fclose(out_c);
1064
1065         name = getenv("KCONFIG_AUTOHEADER");
1066         if (!name)
1067                 name = "include/generated/autoconf.h";
1068         if (rename(".tmpconfig.h", name))
1069                 return 1;
1070         name = getenv("KCONFIG_TRISTATE");
1071         if (!name)
1072                 name = "include/generated/tristate.conf";
1073         if (rename(".tmpconfig_tristate", name))
1074                 return 1;
1075         name = getenv("KCONFIG_CMAKE");
1076         if (!name)
1077                 name = "config.cmake";
1078         if (rename(".tmpconfig.cmake", name))
1079                 return 1;
1080         name = conf_get_autoconfig_name();
1081         /*
1082          * This must be the last step, kbuild has a dependency on auto.conf
1083          * and this marks the successful completion of the previous steps.
1084          */
1085         if (rename(".tmpconfig", name))
1086                 return 1;
1087
1088         return 0;
1089 }
1090
1091 static int sym_change_count;
1092 static void (*conf_changed_callback)(void);
1093
1094 void sym_set_change_count(int count)
1095 {
1096         int _sym_change_count = sym_change_count;
1097         sym_change_count = count;
1098         if (conf_changed_callback &&
1099             (bool)_sym_change_count != (bool)count)
1100                 conf_changed_callback();
1101 }
1102
1103 void sym_add_change_count(int count)
1104 {
1105         sym_set_change_count(count + sym_change_count);
1106 }
1107
1108 bool conf_get_changed(void)
1109 {
1110         return sym_change_count;
1111 }
1112
1113 void conf_set_changed_callback(void (*fn)(void))
1114 {
1115         conf_changed_callback = fn;
1116 }
1117
1118 static bool randomize_choice_values(struct symbol *csym)
1119 {
1120         struct property *prop;
1121         struct symbol *sym;
1122         struct expr *e;
1123         int cnt, def;
1124
1125         /*
1126          * If choice is mod then we may have more items selected
1127          * and if no then no-one.
1128          * In both cases stop.
1129          */
1130         if (csym->curr.tri != yes)
1131                 return false;
1132
1133         prop = sym_get_choice_prop(csym);
1134
1135         /* count entries in choice block */
1136         cnt = 0;
1137         expr_list_for_each_sym(prop->expr, e, sym)
1138                 cnt++;
1139
1140         /*
1141          * find a random value and set it to yes,
1142          * set the rest to no so we have only one set
1143          */
1144         def = (rand() % cnt);
1145
1146         cnt = 0;
1147         expr_list_for_each_sym(prop->expr, e, sym) {
1148                 if (def == cnt++) {
1149                         sym->def[S_DEF_USER].tri = yes;
1150                         csym->def[S_DEF_USER].val = sym;
1151                 }
1152                 else {
1153                         sym->def[S_DEF_USER].tri = no;
1154                 }
1155                 sym->flags |= SYMBOL_DEF_USER;
1156                 /* clear VALID to get value calculated */
1157                 sym->flags &= ~SYMBOL_VALID;
1158         }
1159         csym->flags |= SYMBOL_DEF_USER;
1160         /* clear VALID to get value calculated */
1161         csym->flags &= ~(SYMBOL_VALID);
1162
1163         return true;
1164 }
1165
1166 void set_all_choice_values(struct symbol *csym)
1167 {
1168         struct property *prop;
1169         struct symbol *sym;
1170         struct expr *e;
1171
1172         prop = sym_get_choice_prop(csym);
1173
1174         /*
1175          * Set all non-assinged choice values to no
1176          */
1177         expr_list_for_each_sym(prop->expr, e, sym) {
1178                 if (!sym_has_value(sym))
1179                         sym->def[S_DEF_USER].tri = no;
1180         }
1181         csym->flags |= SYMBOL_DEF_USER;
1182         /* clear VALID to get value calculated */
1183         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1184 }
1185
1186 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1187 {
1188         struct symbol *sym, *csym;
1189         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1190                                          * pty: probability of tristate = y
1191                                          * ptm: probability of tristate = m
1192                                          */
1193
1194         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1195                                    * below, otherwise gcc whines about
1196                                    * -Wmaybe-uninitialized */
1197         if (mode == def_random) {
1198                 int n, p[3];
1199                 char *env = getenv("KCONFIG_PROBABILITY");
1200                 n = 0;
1201                 while( env && *env ) {
1202                         char *endp;
1203                         int tmp = strtol( env, &endp, 10 );
1204                         if( tmp >= 0 && tmp <= 100 ) {
1205                                 p[n++] = tmp;
1206                         } else {
1207                                 errno = ERANGE;
1208                                 perror( "KCONFIG_PROBABILITY" );
1209                                 exit( 1 );
1210                         }
1211                         env = (*endp == ':') ? endp+1 : endp;
1212                         if( n >=3 ) {
1213                                 break;
1214                         }
1215                 }
1216                 switch( n ) {
1217                 case 1:
1218                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1219                         break;
1220                 case 2:
1221                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1222                         break;
1223                 case 3:
1224                         pby = p[0]; pty = p[1]; ptm = p[2];
1225                         break;
1226                 }
1227
1228                 if( pty+ptm > 100 ) {
1229                         errno = ERANGE;
1230                         perror( "KCONFIG_PROBABILITY" );
1231                         exit( 1 );
1232                 }
1233         }
1234         bool has_changed = false;
1235
1236         for_all_symbols(i, sym) {
1237                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1238                         continue;
1239                 switch (sym_get_type(sym)) {
1240                 case S_BOOLEAN:
1241                 case S_TRISTATE:
1242                         has_changed = true;
1243                         switch (mode) {
1244                         case def_yes:
1245                                 sym->def[S_DEF_USER].tri = yes;
1246                                 break;
1247                         case def_mod:
1248                                 sym->def[S_DEF_USER].tri = mod;
1249                                 break;
1250                         case def_no:
1251                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1252                                         sym->def[S_DEF_USER].tri = yes;
1253                                 else
1254                                         sym->def[S_DEF_USER].tri = no;
1255                                 break;
1256                         case def_random:
1257                                 sym->def[S_DEF_USER].tri = no;
1258                                 cnt = rand() % 100;
1259                                 if (sym->type == S_TRISTATE) {
1260                                         if (cnt < pty)
1261                                                 sym->def[S_DEF_USER].tri = yes;
1262                                         else if (cnt < (pty+ptm))
1263                                                 sym->def[S_DEF_USER].tri = mod;
1264                                 } else if (cnt < pby)
1265                                         sym->def[S_DEF_USER].tri = yes;
1266                                 break;
1267                         default:
1268                                 continue;
1269                         }
1270                         if (!(sym_is_choice(sym) && mode == def_random))
1271                                 sym->flags |= SYMBOL_DEF_USER;
1272                         break;
1273                 default:
1274                         break;
1275                 }
1276
1277         }
1278
1279         sym_clear_all_valid();
1280
1281         /*
1282          * We have different type of choice blocks.
1283          * If curr.tri equals to mod then we can select several
1284          * choice symbols in one block.
1285          * In this case we do nothing.
1286          * If curr.tri equals yes then only one symbol can be
1287          * selected in a choice block and we set it to yes,
1288          * and the rest to no.
1289          */
1290         if (mode != def_random) {
1291                 for_all_symbols(i, csym) {
1292                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1293                             sym_is_choice_value(csym))
1294                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1295                 }
1296         }
1297
1298         for_all_symbols(i, csym) {
1299                 if (sym_has_value(csym) || !sym_is_choice(csym))
1300                         continue;
1301
1302                 sym_calc_value(csym);
1303                 if (mode == def_random)
1304                         has_changed = randomize_choice_values(csym);
1305                 else {
1306                         set_all_choice_values(csym);
1307                         has_changed = true;
1308                 }
1309         }
1310
1311         return has_changed;
1312 }