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