kernel/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 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[] = "arch/$ARCH/defconfig";
  34
  35 static void conf_warning(const char *fmt, ...)
  36 {
  37         va_list ap;
  38         va_start(ap, fmt);
  39         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  40         vfprintf(stderr, fmt, ap);
  41         fprintf(stderr, "\n");
  42         va_end(ap);
  43         conf_warnings++;
  44 }
  45
  46 static void conf_default_message_callback(const char *fmt, va_list ap)
  47 {
  48         printf("#\n# ");
  49         vprintf(fmt, ap);
  50         printf("\n#\n");
  51 }
  52
  53 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  54         conf_default_message_callback;
  55 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  56 {
  57         conf_message_callback = fn;
  58 }
  59
  60 static void conf_message(const char *fmt, ...)
  61 {
  62         va_list ap;
  63
  64         va_start(ap, fmt);
  65         if (conf_message_callback)
  66                 conf_message_callback(fmt, ap);
  67         va_end(ap);
  68 }
  69
  70 const char *conf_get_configname(void)
  71 {
  72         char *name = getenv("KCONFIG_CONFIG");
  73
  74         return name ? name : ".config";
  75 }
  76
  77 const char *conf_get_autoconfig_name(void)
  78 {
  79         char *name = getenv("KCONFIG_AUTOCONFIG");
  80
  81         return name ? name : "include/config/auto.conf";
  82 }
  83
  84 static char *conf_expand_value(const char *in)
  85 {
  86         struct symbol *sym;
  87         const char *src;
  88         static char res_value[SYMBOL_MAXLENGTH];
  89         char *dst, name[SYMBOL_MAXLENGTH];
  90
  91         res_value[0] = 0;
  92         dst = name;
  93         while ((src = strchr(in, '$'))) {
  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                         if (modules_sym)
 272                                 sym_calc_value(modules_sym);
 273                         return 1;
 274                 }
 275
 276                 for_all_defaults(sym_defconfig_list, prop) {
 277                         if (expr_calc_value(prop->visible.expr) == no ||
 278                             prop->expr->type != E_SYMBOL)
 279                                 continue;
 280                         name = conf_expand_value(prop->expr->left.sym->name);
 281                         in = zconf_fopen(name);
 282                         if (in) {
 283                                 conf_message(_("using defaults found in %s"),
 284                                          name);
 285                                 goto load;
 286                         }
 287                 }
 288         }
 289         if (!in)
 290                 return 1;
 291
 292 load:
 293         conf_filename = name;
 294         conf_lineno = 0;
 295         conf_warnings = 0;
 296         conf_unsaved = 0;
 297
 298         def_flags = SYMBOL_DEF << def;
 299         for_all_symbols(i, sym) {
 300                 sym->flags |= SYMBOL_CHANGED;
 301                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 302                 if (sym_is_choice(sym))
 303                         sym->flags |= def_flags;
 304                 switch (sym->type) {
 305                 case S_INT:
 306                 case S_HEX:
 307                 case S_STRING:
 308                         if (sym->def[def].val)
 309                                 free(sym->def[def].val);
 310                         /* fall through */
 311                 default:
 312                         sym->def[def].val = NULL;
 313                         sym->def[def].tri = no;
 314                 }
 315         }
 316
 317         while (compat_getline(&line, &line_asize, in) != -1) {
 318                 conf_lineno++;
 319                 sym = NULL;
 320                 if (line[0] == '#') {
 321                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 322                                 continue;
 323                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 324                         if (!p)
 325                                 continue;
 326                         *p++ = 0;
 327                         if (strncmp(p, "is not set", 10))
 328                                 continue;
 329                         if (def == S_DEF_USER) {
 330                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 331                                 if (!sym) {
 332                                         sym_add_change_count(1);
 333                                         goto setsym;
 334                                 }
 335                         } else {
 336                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 337                                 if (sym->type == S_UNKNOWN)
 338                                         sym->type = S_BOOLEAN;
 339                         }
 340                         if (sym->flags & def_flags) {
 341                                 conf_warning("override: reassigning to symbol %s", sym->name);
 342                         }
 343                         switch (sym->type) {
 344                         case S_BOOLEAN:
 345                         case S_TRISTATE:
 346                                 sym->def[def].tri = no;
 347                                 sym->flags |= def_flags;
 348                                 break;
 349                         default:
 350                                 ;
 351                         }
 352                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 353                         p = strchr(line + strlen(CONFIG_), '=');
 354                         if (!p)
 355                                 continue;
 356                         *p++ = 0;
 357                         p2 = strchr(p, '\n');
 358                         if (p2) {
 359                                 *p2-- = 0;
 360                                 if (*p2 == '\r')
 361                                         *p2 = 0;
 362                         }
 363                         if (def == S_DEF_USER) {
 364                                 sym = sym_find(line + strlen(CONFIG_));
 365                                 if (!sym) {
 366                                         sym_add_change_count(1);
 367                                         goto setsym;
 368                                 }
 369                         } else {
 370                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 371                                 if (sym->type == S_UNKNOWN)
 372                                         sym->type = S_OTHER;
 373                         }
 374                         if (sym->flags & def_flags) {
 375                                 conf_warning("override: reassigning to symbol %s", sym->name);
 376                         }
 377                         if (conf_set_sym_val(sym, def, def_flags, p))
 378                                 continue;
 379                 } else {
 380                         if (line[0] != '\r' && line[0] != '\n')
 381                                 conf_warning("unexpected data");
 382                         continue;
 383                 }
 384 setsym:
 385                 if (sym && sym_is_choice_value(sym)) {
 386                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 387                         switch (sym->def[def].tri) {
 388                         case no:
 389                                 break;
 390                         case mod:
 391                                 if (cs->def[def].tri == yes) {
 392                                         conf_warning("%s creates inconsistent choice state", sym->name);
 393                                         cs->flags &= ~def_flags;
 394                                 }
 395                                 break;
 396                         case yes:
 397                                 if (cs->def[def].tri != no)
 398                                         conf_warning("override: %s changes choice state", sym->name);
 399                                 cs->def[def].val = sym;
 400                                 break;
 401                         }
 402                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 403                 }
 404         }
 405         free(line);
 406         fclose(in);
 407
 408         if (modules_sym)
 409                 sym_calc_value(modules_sym);
 410         return 0;
 411 }
 412
 413 int conf_read(const char *name)
 414 {
 415         struct symbol *sym;
 416         int i;
 417
 418         sym_set_change_count(0);
 419
 420         if (conf_read_simple(name, S_DEF_USER))
 421                 return 1;
 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_comment(FILE *fp, const char *value, void *arg)
 512 {
 513         const char *p = value;
 514         size_t l;
 515
 516         for (;;) {
 517                 l = strcspn(p, "\n");
 518                 fprintf(fp, "#");
 519                 if (l) {
 520                         fprintf(fp, " ");
 521                         xfwrite(p, l, 1, fp);
 522                         p += l;
 523                 }
 524                 fprintf(fp, "\n");
 525                 if (*p++ == '\0')
 526                         break;
 527         }
 528 }
 529
 530 static struct conf_printer kconfig_printer_cb =
 531 {
 532         .print_symbol = kconfig_print_symbol,
 533         .print_comment = kconfig_print_comment,
 534 };
 535
 536 /*
 537  * Header printer
 538  *
 539  * This printer is used when generating the `include/generated/autoconf.h' file.
 540  */
 541 static void
 542 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 543 {
 544
 545         switch (sym->type) {
 546         case S_BOOLEAN:
 547         case S_TRISTATE: {
 548                 const char *suffix = "";
 549
 550                 switch (*value) {
 551                 case 'n':
 552                         break;
 553                 case 'm':
 554                         suffix = "_MODULE";
 555                         /* fall through */
 556                 default:
 557                         fprintf(fp, "#define %s%s%s 1\n",
 558                             CONFIG_, sym->name, suffix);
 559                 }
 560                 break;
 561         }
 562         case S_HEX: {
 563                 const char *prefix = "";
 564
 565                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 566                         prefix = "0x";
 567                 fprintf(fp, "#define %s%s %s%s\n",
 568                     CONFIG_, sym->name, prefix, value);
 569                 break;
 570         }
 571         case S_STRING:
 572         case S_INT:
 573                 fprintf(fp, "#define %s%s %s\n",
 574                     CONFIG_, sym->name, value);
 575                 break;
 576         default:
 577                 break;
 578         }
 579
 580 }
 581
 582 static void
 583 header_print_comment(FILE *fp, const char *value, void *arg)
 584 {
 585         const char *p = value;
 586         size_t l;
 587
 588         fprintf(fp, "/*\n");
 589         for (;;) {
 590                 l = strcspn(p, "\n");
 591                 fprintf(fp, " *");
 592                 if (l) {
 593                         fprintf(fp, " ");
 594                         xfwrite(p, l, 1, fp);
 595                         p += l;
 596                 }
 597                 fprintf(fp, "\n");
 598                 if (*p++ == '\0')
 599                         break;
 600         }
 601         fprintf(fp, " */\n");
 602 }
 603
 604 static struct conf_printer header_printer_cb =
 605 {
 606         .print_symbol = header_print_symbol,
 607         .print_comment = header_print_comment,
 608 };
 609
 610 /*
 611  * Tristate printer
 612  *
 613  * This printer is used when generating the `include/config/tristate.conf' file.
 614  */
 615 static void
 616 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 617 {
 618
 619         if (sym->type == S_TRISTATE && *value != 'n')
 620                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 621 }
 622
 623 static struct conf_printer tristate_printer_cb =
 624 {
 625         .print_symbol = tristate_print_symbol,
 626         .print_comment = kconfig_print_comment,
 627 };
 628
 629 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 630                               struct conf_printer *printer, void *printer_arg)
 631 {
 632         const char *str;
 633
 634         switch (sym->type) {
 635         case S_OTHER:
 636         case S_UNKNOWN:
 637                 break;
 638         case S_STRING:
 639                 str = sym_get_string_value(sym);
 640                 str = sym_escape_string_value(str);
 641                 printer->print_symbol(fp, sym, str, printer_arg);
 642                 free((void *)str);
 643                 break;
 644         default:
 645                 str = sym_get_string_value(sym);
 646                 printer->print_symbol(fp, sym, str, printer_arg);
 647         }
 648 }
 649
 650 static void
 651 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 652 {
 653         char buf[256];
 654
 655         snprintf(buf, sizeof(buf),
 656             "\n"
 657             "Automatically generated file; DO NOT EDIT.\n"
 658             "%s\n",
 659             rootmenu.prompt->text);
 660
 661         printer->print_comment(fp, buf, printer_arg);
 662 }
 663
 664 /*
 665  * Write out a minimal config.
 666  * All values that has default values are skipped as this is redundant.
 667  */
 668 int conf_write_defconfig(const char *filename)
 669 {
 670         struct symbol *sym;
 671         struct menu *menu;
 672         FILE *out;
 673
 674         out = fopen(filename, "w");
 675         if (!out)
 676                 return 1;
 677
 678         sym_clear_all_valid();
 679
 680         /* Traverse all menus to find all relevant symbols */
 681         menu = rootmenu.list;
 682
 683         while (menu != NULL)
 684         {
 685                 sym = menu->sym;
 686                 if (sym == NULL) {
 687                         if (!menu_is_visible(menu))
 688                                 goto next_menu;
 689                 } else if (!sym_is_choice(sym)) {
 690                         sym_calc_value(sym);
 691                         if (!(sym->flags & SYMBOL_WRITE))
 692                                 goto next_menu;
 693                         sym->flags &= ~SYMBOL_WRITE;
 694                         /* If we cannot change the symbol - skip */
 695                         if (!sym_is_changable(sym))
 696                                 goto next_menu;
 697                         /* If symbol equals to default value - skip */
 698                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 699                                 goto next_menu;
 700
 701                         /*
 702                          * If symbol is a choice value and equals to the
 703                          * default for a choice - skip.
 704                          * But only if value is bool and equal to "y" and
 705                          * choice is not "optional".
 706                          * (If choice is "optional" then all values can be "n")
 707                          */
 708                         if (sym_is_choice_value(sym)) {
 709                                 struct symbol *cs;
 710                                 struct symbol *ds;
 711
 712                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 713                                 ds = sym_choice_default(cs);
 714                                 if (!sym_is_optional(cs) && sym == ds) {
 715                                         if ((sym->type == S_BOOLEAN) &&
 716                                             sym_get_tristate_value(sym) == yes)
 717                                                 goto next_menu;
 718                                 }
 719                         }
 720                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 721                 }
 722 next_menu:
 723                 if (menu->list != NULL) {
 724                         menu = menu->list;
 725                 }
 726                 else if (menu->next != NULL) {
 727                         menu = menu->next;
 728                 } else {
 729                         while ((menu = menu->parent)) {
 730                                 if (menu->next != NULL) {
 731                                         menu = menu->next;
 732                                         break;
 733                                 }
 734                         }
 735                 }
 736         }
 737         fclose(out);
 738         return 0;
 739 }
 740
 741 int conf_write(const char *name)
 742 {
 743         FILE *out;
 744         struct symbol *sym;
 745         struct menu *menu;
 746         const char *basename;
 747         const char *str;
 748         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 749         char *env;
 750
 751         dirname[0] = 0;
 752         if (name && name[0]) {
 753                 struct stat st;
 754                 char *slash;
 755
 756                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 757                         strcpy(dirname, name);
 758                         strcat(dirname, "/");
 759                         basename = conf_get_configname();
 760                 } else if ((slash = strrchr(name, '/'))) {
 761                         int size = slash - name + 1;
 762                         memcpy(dirname, name, size);
 763                         dirname[size] = 0;
 764                         if (slash[1])
 765                                 basename = slash + 1;
 766                         else
 767                                 basename = conf_get_configname();
 768                 } else
 769                         basename = name;
 770         } else
 771                 basename = conf_get_configname();
 772
 773         sprintf(newname, "%s%s", dirname, basename);
 774         env = getenv("KCONFIG_OVERWRITECONFIG");
 775         if (!env || !*env) {
 776                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 777                 out = fopen(tmpname, "w");
 778         } else {
 779                 *tmpname = 0;
 780                 out = fopen(newname, "w");
 781         }
 782         if (!out)
 783                 return 1;
 784
 785         conf_write_heading(out, &kconfig_printer_cb, NULL);
 786
 787         if (!conf_get_changed())
 788                 sym_clear_all_valid();
 789
 790         menu = rootmenu.list;
 791         while (menu) {
 792                 sym = menu->sym;
 793                 if (!sym) {
 794                         if (!menu_is_visible(menu))
 795                                 goto next;
 796                         str = menu_get_prompt(menu);
 797                         fprintf(out, "\n"
 798                                      "#\n"
 799                                      "# %s\n"
 800                                      "#\n", str);
 801                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 802                         sym_calc_value(sym);
 803                         if (!(sym->flags & SYMBOL_WRITE))
 804                                 goto next;
 805                         sym->flags &= ~SYMBOL_WRITE;
 806
 807                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 808                 }
 809
 810 next:
 811                 if (menu->list) {
 812                         menu = menu->list;
 813                         continue;
 814                 }
 815                 if (menu->next)
 816                         menu = menu->next;
 817                 else while ((menu = menu->parent)) {
 818                         if (menu->next) {
 819                                 menu = menu->next;
 820                                 break;
 821                         }
 822                 }
 823         }
 824         fclose(out);
 825
 826         if (*tmpname) {
 827                 strcat(dirname, basename);
 828                 strcat(dirname, ".old");
 829                 rename(newname, dirname);
 830                 if (rename(tmpname, newname))
 831                         return 1;
 832         }
 833
 834         conf_message(_("configuration written to %s"), newname);
 835
 836         sym_set_change_count(0);
 837
 838         return 0;
 839 }
 840
 841 static int conf_split_config(void)
 842 {
 843         const char *name;
 844         char path[PATH_MAX+1];
 845         char *s, *d, c;
 846         struct symbol *sym;
 847         struct stat sb;
 848         int res, i, fd;
 849
 850         name = conf_get_autoconfig_name();
 851         conf_read_simple(name, S_DEF_AUTO);
 852
 853         if (chdir("include/config"))
 854                 return 1;
 855
 856         res = 0;
 857         for_all_symbols(i, sym) {
 858                 sym_calc_value(sym);
 859                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 860                         continue;
 861                 if (sym->flags & SYMBOL_WRITE) {
 862                         if (sym->flags & SYMBOL_DEF_AUTO) {
 863                                 /*
 864                                  * symbol has old and new value,
 865                                  * so compare them...
 866                                  */
 867                                 switch (sym->type) {
 868                                 case S_BOOLEAN:
 869                                 case S_TRISTATE:
 870                                         if (sym_get_tristate_value(sym) ==
 871                                             sym->def[S_DEF_AUTO].tri)
 872                                                 continue;
 873                                         break;
 874                                 case S_STRING:
 875                                 case S_HEX:
 876                                 case S_INT:
 877                                         if (!strcmp(sym_get_string_value(sym),
 878                                                     sym->def[S_DEF_AUTO].val))
 879                                                 continue;
 880                                         break;
 881                                 default:
 882                                         break;
 883                                 }
 884                         } else {
 885                                 /*
 886                                  * If there is no old value, only 'no' (unset)
 887                                  * is allowed as new value.
 888                                  */
 889                                 switch (sym->type) {
 890                                 case S_BOOLEAN:
 891                                 case S_TRISTATE:
 892                                         if (sym_get_tristate_value(sym) == no)
 893                                                 continue;
 894                                         break;
 895                                 default:
 896                                         break;
 897                                 }
 898                         }
 899                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 900                         /* There is neither an old nor a new value. */
 901                         continue;
 902                 /* else
 903                  *      There is an old value, but no new value ('no' (unset)
 904                  *      isn't saved in auto.conf, so the old value is always
 905                  *      different from 'no').
 906                  */
 907
 908                 /* Replace all '_' and append ".h" */
 909                 s = sym->name;
 910                 d = path;
 911                 while ((c = *s++)) {
 912                         c = tolower(c);
 913                         *d++ = (c == '_') ? '/' : c;
 914                 }
 915                 strcpy(d, ".h");
 916
 917                 /* Assume directory path already exists. */
 918                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 919                 if (fd == -1) {
 920                         if (errno != ENOENT) {
 921                                 res = 1;
 922                                 break;
 923                         }
 924                         /*
 925                          * Create directory components,
 926                          * unless they exist already.
 927                          */
 928                         d = path;
 929                         while ((d = strchr(d, '/'))) {
 930                                 *d = 0;
 931                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 932                                         res = 1;
 933                                         goto out;
 934                                 }
 935                                 *d++ = '/';
 936                         }
 937                         /* Try it again. */
 938                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 939                         if (fd == -1) {
 940                                 res = 1;
 941                                 break;
 942                         }
 943                 }
 944                 close(fd);
 945         }
 946 out:
 947         if (chdir("../.."))
 948                 return 1;
 949
 950         return res;
 951 }
 952
 953 int conf_write_autoconf(void)
 954 {
 955         struct symbol *sym;
 956         const char *name;
 957         FILE *out, *tristate, *out_h;
 958         int i;
 959
 960         sym_clear_all_valid();
 961
 962         file_write_dep("include/config/auto.conf.cmd");
 963
 964         if (conf_split_config())
 965                 return 1;
 966
 967         out = fopen(".tmpconfig", "w");
 968         if (!out)
 969                 return 1;
 970
 971         tristate = fopen(".tmpconfig_tristate", "w");
 972         if (!tristate) {
 973                 fclose(out);
 974                 return 1;
 975         }
 976
 977         out_h = fopen(".tmpconfig.h", "w");
 978         if (!out_h) {
 979                 fclose(out);
 980                 fclose(tristate);
 981                 return 1;
 982         }
 983
 984         conf_write_heading(out, &kconfig_printer_cb, NULL);
 985
 986         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 987
 988         conf_write_heading(out_h, &header_printer_cb, NULL);
 989
 990         for_all_symbols(i, sym) {
 991                 sym_calc_value(sym);
 992                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 993                         continue;
 994
 995                 /* write symbol to auto.conf, tristate and header files */
 996                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 997
 998                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 999
1000                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1001         }
1002         fclose(out);
1003         fclose(tristate);
1004         fclose(out_h);
1005
1006         name = getenv("KCONFIG_AUTOHEADER");
1007         if (!name)
1008                 name = "include/generated/autoconf.h";
1009         if (rename(".tmpconfig.h", name))
1010                 return 1;
1011         name = getenv("KCONFIG_TRISTATE");
1012         if (!name)
1013                 name = "include/config/tristate.conf";
1014         if (rename(".tmpconfig_tristate", name))
1015                 return 1;
1016         name = conf_get_autoconfig_name();
1017         /*
1018          * This must be the last step, kbuild has a dependency on auto.conf
1019          * and this marks the successful completion of the previous steps.
1020          */
1021         if (rename(".tmpconfig", name))
1022                 return 1;
1023
1024         return 0;
1025 }
1026
1027 static int sym_change_count;
1028 static void (*conf_changed_callback)(void);
1029
1030 void sym_set_change_count(int count)
1031 {
1032         int _sym_change_count = sym_change_count;
1033         sym_change_count = count;
1034         if (conf_changed_callback &&
1035             (bool)_sym_change_count != (bool)count)
1036                 conf_changed_callback();
1037 }
1038
1039 void sym_add_change_count(int count)
1040 {
1041         sym_set_change_count(count + sym_change_count);
1042 }
1043
1044 bool conf_get_changed(void)
1045 {
1046         return sym_change_count;
1047 }
1048
1049 void conf_set_changed_callback(void (*fn)(void))
1050 {
1051         conf_changed_callback = fn;
1052 }
1053
1054 static bool randomize_choice_values(struct symbol *csym)
1055 {
1056         struct property *prop;
1057         struct symbol *sym;
1058         struct expr *e;
1059         int cnt, def;
1060
1061         /*
1062          * If choice is mod then we may have more items selected
1063          * and if no then no-one.
1064          * In both cases stop.
1065          */
1066         if (csym->curr.tri != yes)
1067                 return false;
1068
1069         prop = sym_get_choice_prop(csym);
1070
1071         /* count entries in choice block */
1072         cnt = 0;
1073         expr_list_for_each_sym(prop->expr, e, sym)
1074                 cnt++;
1075
1076         /*
1077          * find a random value and set it to yes,
1078          * set the rest to no so we have only one set
1079          */
1080         def = (rand() % cnt);
1081
1082         cnt = 0;
1083         expr_list_for_each_sym(prop->expr, e, sym) {
1084                 if (def == cnt++) {
1085                         sym->def[S_DEF_USER].tri = yes;
1086                         csym->def[S_DEF_USER].val = sym;
1087                 }
1088                 else {
1089                         sym->def[S_DEF_USER].tri = no;
1090                 }
1091                 sym->flags |= SYMBOL_DEF_USER;
1092                 /* clear VALID to get value calculated */
1093                 sym->flags &= ~SYMBOL_VALID;
1094         }
1095         csym->flags |= SYMBOL_DEF_USER;
1096         /* clear VALID to get value calculated */
1097         csym->flags &= ~(SYMBOL_VALID);
1098
1099         return true;
1100 }
1101
1102 void set_all_choice_values(struct symbol *csym)
1103 {
1104         struct property *prop;
1105         struct symbol *sym;
1106         struct expr *e;
1107
1108         prop = sym_get_choice_prop(csym);
1109
1110         /*
1111          * Set all non-assinged choice values to no
1112          */
1113         expr_list_for_each_sym(prop->expr, e, sym) {
1114                 if (!sym_has_value(sym))
1115                         sym->def[S_DEF_USER].tri = no;
1116         }
1117         csym->flags |= SYMBOL_DEF_USER;
1118         /* clear VALID to get value calculated */
1119         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1120 }
1121
1122 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1123 {
1124         struct symbol *sym, *csym;
1125         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1126                                          * pty: probability of tristate = y
1127                                          * ptm: probability of tristate = m
1128                                          */
1129
1130         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1131                                    * below, otherwise gcc whines about
1132                                    * -Wmaybe-uninitialized */
1133         if (mode == def_random) {
1134                 int n, p[3];
1135                 char *env = getenv("KCONFIG_PROBABILITY");
1136                 n = 0;
1137                 while( env && *env ) {
1138                         char *endp;
1139                         int tmp = strtol( env, &endp, 10 );
1140                         if( tmp >= 0 && tmp <= 100 ) {
1141                                 p[n++] = tmp;
1142                         } else {
1143                                 errno = ERANGE;
1144                                 perror( "KCONFIG_PROBABILITY" );
1145                                 exit( 1 );
1146                         }
1147                         env = (*endp == ':') ? endp+1 : endp;
1148                         if( n >=3 ) {
1149                                 break;
1150                         }
1151                 }
1152                 switch( n ) {
1153                 case 1:
1154                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1155                         break;
1156                 case 2:
1157                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1158                         break;
1159                 case 3:
1160                         pby = p[0]; pty = p[1]; ptm = p[2];
1161                         break;
1162                 }
1163
1164                 if( pty+ptm > 100 ) {
1165                         errno = ERANGE;
1166                         perror( "KCONFIG_PROBABILITY" );
1167                         exit( 1 );
1168                 }
1169         }
1170         bool has_changed = false;
1171
1172         for_all_symbols(i, sym) {
1173                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1174                         continue;
1175                 switch (sym_get_type(sym)) {
1176                 case S_BOOLEAN:
1177                 case S_TRISTATE:
1178                         has_changed = true;
1179                         switch (mode) {
1180                         case def_yes:
1181                                 sym->def[S_DEF_USER].tri = yes;
1182                                 break;
1183                         case def_mod:
1184                                 sym->def[S_DEF_USER].tri = mod;
1185                                 break;
1186                         case def_no:
1187                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1188                                         sym->def[S_DEF_USER].tri = yes;
1189                                 else
1190                                         sym->def[S_DEF_USER].tri = no;
1191                                 break;
1192                         case def_random:
1193                                 sym->def[S_DEF_USER].tri = no;
1194                                 cnt = rand() % 100;
1195                                 if (sym->type == S_TRISTATE) {
1196                                         if (cnt < pty)
1197                                                 sym->def[S_DEF_USER].tri = yes;
1198                                         else if (cnt < (pty+ptm))
1199                                                 sym->def[S_DEF_USER].tri = mod;
1200                                 } else if (cnt < pby)
1201                                         sym->def[S_DEF_USER].tri = yes;
1202                                 break;
1203                         default:
1204                                 continue;
1205                         }
1206                         if (!(sym_is_choice(sym) && mode == def_random))
1207                                 sym->flags |= SYMBOL_DEF_USER;
1208                         break;
1209                 default:
1210                         break;
1211                 }
1212
1213         }
1214
1215         sym_clear_all_valid();
1216
1217         /*
1218          * We have different type of choice blocks.
1219          * If curr.tri equals to mod then we can select several
1220          * choice symbols in one block.
1221          * In this case we do nothing.
1222          * If curr.tri equals yes then only one symbol can be
1223          * selected in a choice block and we set it to yes,
1224          * and the rest to no.
1225          */
1226         if (mode != def_random) {
1227                 for_all_symbols(i, csym) {
1228                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1229                             sym_is_choice_value(csym))
1230                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1231                 }
1232         }
1233
1234         for_all_symbols(i, csym) {
1235                 if (sym_has_value(csym) || !sym_is_choice(csym))
1236                         continue;
1237
1238                 sym_calc_value(csym);
1239                 if (mode == def_random)
1240                         has_changed = randomize_choice_values(csym);
1241                 else {
1242                         set_all_choice_values(csym);
1243                         has_changed = true;
1244                 }
1245         }
1246
1247         return has_changed;
1248 }