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 <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <time.h>
  14 #include <unistd.h>
  15
  16 #define LKC_DIRECT_LINK
  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         case S_BOOLEAN:
 132                 if (p[0] == 'y') {
 133                         sym->def[def].tri = yes;
 134                         sym->flags |= def_flags;
 135                         break;
 136                 }
 137                 if (p[0] == 'n') {
 138                         sym->def[def].tri = no;
 139                         sym->flags |= def_flags;
 140                         break;
 141                 }
 142                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 143                 break;
 144         case S_OTHER:
 145                 if (*p != '"') {
 146                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 147                                 ;
 148                         sym->type = S_STRING;
 149                         goto done;
 150                 }
 151         case S_STRING:
 152                 if (*p++ != '"')
 153                         break;
 154                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 155                         if (*p2 == '"') {
 156                                 *p2 = 0;
 157                                 break;
 158                         }
 159                         memmove(p2, p2 + 1, strlen(p2));
 160                 }
 161                 if (!p2) {
 162                         conf_warning("invalid string found");
 163                         return 1;
 164                 }
 165         case S_INT:
 166         case S_HEX:
 167         done:
 168                 if (sym_string_valid(sym, p)) {
 169                         sym->def[def].val = strdup(p);
 170                         sym->flags |= def_flags;
 171                 } else {
 172                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 173                         return 1;
 174                 }
 175                 break;
 176         default:
 177                 ;
 178         }
 179         return 0;
 180 }
 181
 182 int conf_read_simple(const char *name, int def)
 183 {
 184         FILE *in = NULL;
 185         char line[1024];
 186         char *p, *p2;
 187         struct symbol *sym;
 188         int i, def_flags;
 189
 190         if (name) {
 191                 in = zconf_fopen(name);
 192         } else {
 193                 struct property *prop;
 194
 195                 name = conf_get_configname();
 196                 in = zconf_fopen(name);
 197                 if (in)
 198                         goto load;
 199                 sym_add_change_count(1);
 200                 if (!sym_defconfig_list) {
 201                         if (modules_sym)
 202                                 sym_calc_value(modules_sym);
 203                         return 1;
 204                 }
 205
 206                 for_all_defaults(sym_defconfig_list, prop) {
 207                         if (expr_calc_value(prop->visible.expr) == no ||
 208                             prop->expr->type != E_SYMBOL)
 209                                 continue;
 210                         name = conf_expand_value(prop->expr->left.sym->name);
 211                         in = zconf_fopen(name);
 212                         if (in) {
 213                                 conf_message(_("using defaults found in %s"),
 214                                          name);
 215                                 goto load;
 216                         }
 217                 }
 218         }
 219         if (!in)
 220                 return 1;
 221
 222 load:
 223         conf_filename = name;
 224         conf_lineno = 0;
 225         conf_warnings = 0;
 226         conf_unsaved = 0;
 227
 228         def_flags = SYMBOL_DEF << def;
 229         for_all_symbols(i, sym) {
 230                 sym->flags |= SYMBOL_CHANGED;
 231                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 232                 if (sym_is_choice(sym))
 233                         sym->flags |= def_flags;
 234                 switch (sym->type) {
 235                 case S_INT:
 236                 case S_HEX:
 237                 case S_STRING:
 238                         if (sym->def[def].val)
 239                                 free(sym->def[def].val);
 240                 default:
 241                         sym->def[def].val = NULL;
 242                         sym->def[def].tri = no;
 243                 }
 244         }
 245
 246         while (fgets(line, sizeof(line), in)) {
 247                 conf_lineno++;
 248                 sym = NULL;
 249                 if (line[0] == '#') {
 250                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 251                                 continue;
 252                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 253                         if (!p)
 254                                 continue;
 255                         *p++ = 0;
 256                         if (strncmp(p, "is not set", 10))
 257                                 continue;
 258                         if (def == S_DEF_USER) {
 259                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 260                                 if (!sym) {
 261                                         sym_add_change_count(1);
 262                                         goto setsym;
 263                                 }
 264                         } else {
 265                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 266                                 if (sym->type == S_UNKNOWN)
 267                                         sym->type = S_BOOLEAN;
 268                         }
 269                         if (sym->flags & def_flags) {
 270                                 conf_warning("override: reassigning to symbol %s", sym->name);
 271                         }
 272                         switch (sym->type) {
 273                         case S_BOOLEAN:
 274                         case S_TRISTATE:
 275                                 sym->def[def].tri = no;
 276                                 sym->flags |= def_flags;
 277                                 break;
 278                         default:
 279                                 ;
 280                         }
 281                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 282                         p = strchr(line + strlen(CONFIG_), '=');
 283                         if (!p)
 284                                 continue;
 285                         *p++ = 0;
 286                         p2 = strchr(p, '\n');
 287                         if (p2) {
 288                                 *p2-- = 0;
 289                                 if (*p2 == '\r')
 290                                         *p2 = 0;
 291                         }
 292                         if (def == S_DEF_USER) {
 293                                 sym = sym_find(line + strlen(CONFIG_));
 294                                 if (!sym) {
 295                                         sym_add_change_count(1);
 296                                         goto setsym;
 297                                 }
 298                         } else {
 299                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 300                                 if (sym->type == S_UNKNOWN)
 301                                         sym->type = S_OTHER;
 302                         }
 303                         if (sym->flags & def_flags) {
 304                                 conf_warning("override: reassigning to symbol %s", sym->name);
 305                         }
 306                         if (conf_set_sym_val(sym, def, def_flags, p))
 307                                 continue;
 308                 } else {
 309                         if (line[0] != '\r' && line[0] != '\n')
 310                                 conf_warning("unexpected data");
 311                         continue;
 312                 }
 313 setsym:
 314                 if (sym && sym_is_choice_value(sym)) {
 315                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 316                         switch (sym->def[def].tri) {
 317                         case no:
 318                                 break;
 319                         case mod:
 320                                 if (cs->def[def].tri == yes) {
 321                                         conf_warning("%s creates inconsistent choice state", sym->name);
 322                                         cs->flags &= ~def_flags;
 323                                 }
 324                                 break;
 325                         case yes:
 326                                 if (cs->def[def].tri != no)
 327                                         conf_warning("override: %s changes choice state", sym->name);
 328                                 cs->def[def].val = sym;
 329                                 break;
 330                         }
 331                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 332                 }
 333         }
 334         fclose(in);
 335
 336         if (modules_sym)
 337                 sym_calc_value(modules_sym);
 338         return 0;
 339 }
 340
 341 int conf_read(const char *name)
 342 {
 343         struct symbol *sym, *choice_sym;
 344         struct property *prop;
 345         struct expr *e;
 346         int i, flags;
 347
 348         sym_set_change_count(0);
 349
 350         if (conf_read_simple(name, S_DEF_USER))
 351                 return 1;
 352
 353         for_all_symbols(i, sym) {
 354                 sym_calc_value(sym);
 355                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 356                         goto sym_ok;
 357                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 358                         /* check that calculated value agrees with saved value */
 359                         switch (sym->type) {
 360                         case S_BOOLEAN:
 361                         case S_TRISTATE:
 362                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 363                                         break;
 364                                 if (!sym_is_choice(sym))
 365                                         goto sym_ok;
 366                         default:
 367                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 368                                         goto sym_ok;
 369                                 break;
 370                         }
 371                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 372                         /* no previous value and not saved */
 373                         goto sym_ok;
 374                 conf_unsaved++;
 375                 /* maybe print value in verbose mode... */
 376         sym_ok:
 377                 if (!sym_is_choice(sym))
 378                         continue;
 379                 /* The choice symbol only has a set value (and thus is not new)
 380                  * if all its visible childs have values.
 381                  */
 382                 prop = sym_get_choice_prop(sym);
 383                 flags = sym->flags;
 384                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 385                         if (choice_sym->visible != no)
 386                                 flags &= choice_sym->flags;
 387                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 388         }
 389
 390         for_all_symbols(i, sym) {
 391                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 392                         /* Reset values of generates values, so they'll appear
 393                          * as new, if they should become visible, but that
 394                          * doesn't quite work if the Kconfig and the saved
 395                          * configuration disagree.
 396                          */
 397                         if (sym->visible == no && !conf_unsaved)
 398                                 sym->flags &= ~SYMBOL_DEF_USER;
 399                         switch (sym->type) {
 400                         case S_STRING:
 401                         case S_INT:
 402                         case S_HEX:
 403                                 /* Reset a string value if it's out of range */
 404                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 405                                         break;
 406                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 407                                 conf_unsaved++;
 408                                 break;
 409                         default:
 410                                 break;
 411                         }
 412                 }
 413         }
 414
 415         sym_add_change_count(conf_warnings || conf_unsaved);
 416
 417         return 0;
 418 }
 419
 420 /* Write a S_STRING */
 421 static void conf_write_string(bool headerfile, const char *name,
 422                               const char *str, FILE *out)
 423 {
 424         int l;
 425         if (headerfile)
 426                 fprintf(out, "#define %s%s \"", CONFIG_, name);
 427         else
 428                 fprintf(out, "%s%s=\"", CONFIG_, name);
 429
 430         while (1) {
 431                 l = strcspn(str, "\"\\");
 432                 if (l) {
 433                         xfwrite(str, l, 1, out);
 434                         str += l;
 435                 }
 436                 if (!*str)
 437                         break;
 438                 fprintf(out, "\\%c", *str++);
 439         }
 440         fputs("\"\n", out);
 441 }
 442
 443 static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
 444                               FILE *out, bool write_no)
 445 {
 446         const char *str;
 447
 448         switch (type) {
 449         case S_BOOLEAN:
 450         case S_TRISTATE:
 451                 switch (sym_get_tristate_value(sym)) {
 452                 case no:
 453                         if (write_no)
 454                                 fprintf(out, "# %s%s is not set\n",
 455                                     CONFIG_, sym->name);
 456                         break;
 457                 case mod:
 458                         fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
 459                         break;
 460                 case yes:
 461                         fprintf(out, "%s%s=y\n", CONFIG_, sym->name);
 462                         break;
 463                 }
 464                 break;
 465         case S_STRING:
 466                 conf_write_string(false, sym->name, sym_get_string_value(sym), out);
 467                 break;
 468         case S_HEX:
 469         case S_INT:
 470                 str = sym_get_string_value(sym);
 471                 fprintf(out, "%s%s=%s\n", CONFIG_, sym->name, str);
 472                 break;
 473         case S_OTHER:
 474         case S_UNKNOWN:
 475                 break;
 476         }
 477 }
 478
 479 /*
 480  * Write out a minimal config.
 481  * All values that has default values are skipped as this is redundant.
 482  */
 483 int conf_write_defconfig(const char *filename)
 484 {
 485         struct symbol *sym;
 486         struct menu *menu;
 487         FILE *out;
 488
 489         out = fopen(filename, "w");
 490         if (!out)
 491                 return 1;
 492
 493         sym_clear_all_valid();
 494
 495         /* Traverse all menus to find all relevant symbols */
 496         menu = rootmenu.list;
 497
 498         while (menu != NULL)
 499         {
 500                 sym = menu->sym;
 501                 if (sym == NULL) {
 502                         if (!menu_is_visible(menu))
 503                                 goto next_menu;
 504                 } else if (!sym_is_choice(sym)) {
 505                         sym_calc_value(sym);
 506                         if (!(sym->flags & SYMBOL_WRITE))
 507                                 goto next_menu;
 508                         sym->flags &= ~SYMBOL_WRITE;
 509                         /* If we cannot change the symbol - skip */
 510                         if (!sym_is_changable(sym))
 511                                 goto next_menu;
 512                         /* If symbol equals to default value - skip */
 513                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 514                                 goto next_menu;
 515
 516                         /*
 517                          * If symbol is a choice value and equals to the
 518                          * default for a choice - skip.
 519                          * But only if value is bool and equal to "y" and
 520                          * choice is not "optional".
 521                          * (If choice is "optional" then all values can be "n")
 522                          */
 523                         if (sym_is_choice_value(sym)) {
 524                                 struct symbol *cs;
 525                                 struct symbol *ds;
 526
 527                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 528                                 ds = sym_choice_default(cs);
 529                                 if (!sym_is_optional(cs) && sym == ds) {
 530                                         if ((sym->type == S_BOOLEAN) &&
 531                                             sym_get_tristate_value(sym) == yes)
 532                                                 goto next_menu;
 533                                 }
 534                         }
 535                         conf_write_symbol(sym, sym->type, out, true);
 536                 }
 537 next_menu:
 538                 if (menu->list != NULL) {
 539                         menu = menu->list;
 540                 }
 541                 else if (menu->next != NULL) {
 542                         menu = menu->next;
 543                 } else {
 544                         while ((menu = menu->parent)) {
 545                                 if (menu->next != NULL) {
 546                                         menu = menu->next;
 547                                         break;
 548                                 }
 549                         }
 550                 }
 551         }
 552         fclose(out);
 553         return 0;
 554 }
 555
 556 int conf_write(const char *name)
 557 {
 558         FILE *out;
 559         struct symbol *sym;
 560         struct menu *menu;
 561         const char *basename;
 562         const char *str;
 563         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 564         enum symbol_type type;
 565         time_t now;
 566         int use_timestamp = 1;
 567         char *env;
 568
 569         dirname[0] = 0;
 570         if (name && name[0]) {
 571                 struct stat st;
 572                 char *slash;
 573
 574                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 575                         strcpy(dirname, name);
 576                         strcat(dirname, "/");
 577                         basename = conf_get_configname();
 578                 } else if ((slash = strrchr(name, '/'))) {
 579                         int size = slash - name + 1;
 580                         memcpy(dirname, name, size);
 581                         dirname[size] = 0;
 582                         if (slash[1])
 583                                 basename = slash + 1;
 584                         else
 585                                 basename = conf_get_configname();
 586                 } else
 587                         basename = name;
 588         } else
 589                 basename = conf_get_configname();
 590
 591         sprintf(newname, "%s%s", dirname, basename);
 592         env = getenv("KCONFIG_OVERWRITECONFIG");
 593         if (!env || !*env) {
 594                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 595                 out = fopen(tmpname, "w");
 596         } else {
 597                 *tmpname = 0;
 598                 out = fopen(newname, "w");
 599         }
 600         if (!out)
 601                 return 1;
 602
 603         time(&now);
 604         env = getenv("KCONFIG_NOTIMESTAMP");
 605         if (env && *env)
 606                 use_timestamp = 0;
 607
 608         fprintf(out, _("#\n"
 609                        "# Automatically generated make config: don't edit\n"
 610                        "# %s\n"
 611                        "%s%s"
 612                        "#\n"),
 613                      rootmenu.prompt->text,
 614                      use_timestamp ? "# " : "",
 615                      use_timestamp ? ctime(&now) : "");
 616
 617         if (!conf_get_changed())
 618                 sym_clear_all_valid();
 619
 620         menu = rootmenu.list;
 621         while (menu) {
 622                 sym = menu->sym;
 623                 if (!sym) {
 624                         if (!menu_is_visible(menu))
 625                                 goto next;
 626                         str = menu_get_prompt(menu);
 627                         fprintf(out, "\n"
 628                                      "#\n"
 629                                      "# %s\n"
 630                                      "#\n", str);
 631                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 632                         sym_calc_value(sym);
 633                         if (!(sym->flags & SYMBOL_WRITE))
 634                                 goto next;
 635                         sym->flags &= ~SYMBOL_WRITE;
 636                         type = sym->type;
 637                         if (type == S_TRISTATE) {
 638                                 sym_calc_value(modules_sym);
 639                                 if (modules_sym->curr.tri == no)
 640                                         type = S_BOOLEAN;
 641                         }
 642                         /* Write config symbol to file */
 643                         conf_write_symbol(sym, type, out, true);
 644                 }
 645
 646 next:
 647                 if (menu->list) {
 648                         menu = menu->list;
 649                         continue;
 650                 }
 651                 if (menu->next)
 652                         menu = menu->next;
 653                 else while ((menu = menu->parent)) {
 654                         if (menu->next) {
 655                                 menu = menu->next;
 656                                 break;
 657                         }
 658                 }
 659         }
 660         fclose(out);
 661
 662         if (*tmpname) {
 663                 strcat(dirname, basename);
 664                 strcat(dirname, ".old");
 665                 rename(newname, dirname);
 666                 if (rename(tmpname, newname))
 667                         return 1;
 668         }
 669
 670         conf_message(_("configuration written to %s"), newname);
 671
 672         sym_set_change_count(0);
 673
 674         return 0;
 675 }
 676
 677 static int conf_split_config(void)
 678 {
 679         const char *name;
 680         char path[PATH_MAX+1];
 681         char *s, *d, c;
 682         struct symbol *sym;
 683         struct stat sb;
 684         int res, i, fd;
 685
 686         name = conf_get_autoconfig_name();
 687         conf_read_simple(name, S_DEF_AUTO);
 688
 689         if (chdir("include/config"))
 690                 return 1;
 691
 692         res = 0;
 693         for_all_symbols(i, sym) {
 694                 sym_calc_value(sym);
 695                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 696                         continue;
 697                 if (sym->flags & SYMBOL_WRITE) {
 698                         if (sym->flags & SYMBOL_DEF_AUTO) {
 699                                 /*
 700                                  * symbol has old and new value,
 701                                  * so compare them...
 702                                  */
 703                                 switch (sym->type) {
 704                                 case S_BOOLEAN:
 705                                 case S_TRISTATE:
 706                                         if (sym_get_tristate_value(sym) ==
 707                                             sym->def[S_DEF_AUTO].tri)
 708                                                 continue;
 709                                         break;
 710                                 case S_STRING:
 711                                 case S_HEX:
 712                                 case S_INT:
 713                                         if (!strcmp(sym_get_string_value(sym),
 714                                                     sym->def[S_DEF_AUTO].val))
 715                                                 continue;
 716                                         break;
 717                                 default:
 718                                         break;
 719                                 }
 720                         } else {
 721                                 /*
 722                                  * If there is no old value, only 'no' (unset)
 723                                  * is allowed as new value.
 724                                  */
 725                                 switch (sym->type) {
 726                                 case S_BOOLEAN:
 727                                 case S_TRISTATE:
 728                                         if (sym_get_tristate_value(sym) == no)
 729                                                 continue;
 730                                         break;
 731                                 default:
 732                                         break;
 733                                 }
 734                         }
 735                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 736                         /* There is neither an old nor a new value. */
 737                         continue;
 738                 /* else
 739                  *      There is an old value, but no new value ('no' (unset)
 740                  *      isn't saved in auto.conf, so the old value is always
 741                  *      different from 'no').
 742                  */
 743
 744                 /* Replace all '_' and append ".h" */
 745                 s = sym->name;
 746                 d = path;
 747                 while ((c = *s++)) {
 748                         c = tolower(c);
 749                         *d++ = (c == '_') ? '/' : c;
 750                 }
 751                 strcpy(d, ".h");
 752
 753                 /* Assume directory path already exists. */
 754                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 755                 if (fd == -1) {
 756                         if (errno != ENOENT) {
 757                                 res = 1;
 758                                 break;
 759                         }
 760                         /*
 761                          * Create directory components,
 762                          * unless they exist already.
 763                          */
 764                         d = path;
 765                         while ((d = strchr(d, '/'))) {
 766                                 *d = 0;
 767                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 768                                         res = 1;
 769                                         goto out;
 770                                 }
 771                                 *d++ = '/';
 772                         }
 773                         /* Try it again. */
 774                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 775                         if (fd == -1) {
 776                                 res = 1;
 777                                 break;
 778                         }
 779                 }
 780                 close(fd);
 781         }
 782 out:
 783         if (chdir("../.."))
 784                 return 1;
 785
 786         return res;
 787 }
 788
 789 int conf_write_autoconf(void)
 790 {
 791         struct symbol *sym;
 792         const char *str;
 793         const char *name;
 794         FILE *out, *tristate, *out_h;
 795         time_t now;
 796         int i;
 797
 798         sym_clear_all_valid();
 799
 800         file_write_dep("include/config/auto.conf.cmd");
 801
 802         if (conf_split_config())
 803                 return 1;
 804
 805         out = fopen(".tmpconfig", "w");
 806         if (!out)
 807                 return 1;
 808
 809         tristate = fopen(".tmpconfig_tristate", "w");
 810         if (!tristate) {
 811                 fclose(out);
 812                 return 1;
 813         }
 814
 815         out_h = fopen(".tmpconfig.h", "w");
 816         if (!out_h) {
 817                 fclose(out);
 818                 fclose(tristate);
 819                 return 1;
 820         }
 821
 822         time(&now);
 823         fprintf(out, "#\n"
 824                      "# Automatically generated make config: don't edit\n"
 825                      "# %s\n"
 826                      "# %s"
 827                      "#\n",
 828                      rootmenu.prompt->text, ctime(&now));
 829         fprintf(tristate, "#\n"
 830                           "# Automatically generated - do not edit\n"
 831                           "\n");
 832         fprintf(out_h, "/*\n"
 833                        " * Automatically generated C config: don't edit\n"
 834                        " * %s\n"
 835                        " * %s"
 836                        " */\n"
 837                        "#define AUTOCONF_INCLUDED\n",
 838                        rootmenu.prompt->text, ctime(&now));
 839
 840         for_all_symbols(i, sym) {
 841                 sym_calc_value(sym);
 842                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 843                         continue;
 844
 845                 /* write symbol to config file */
 846                 conf_write_symbol(sym, sym->type, out, false);
 847
 848                 /* update autoconf and tristate files */
 849                 switch (sym->type) {
 850                 case S_BOOLEAN:
 851                 case S_TRISTATE:
 852                         switch (sym_get_tristate_value(sym)) {
 853                         case no:
 854                                 break;
 855                         case mod:
 856                                 fprintf(tristate, "%s%s=M\n",
 857                                     CONFIG_, sym->name);
 858                                 fprintf(out_h, "#define %s%s_MODULE 1\n",
 859                                     CONFIG_, sym->name);
 860                                 break;
 861                         case yes:
 862                                 if (sym->type == S_TRISTATE)
 863                                         fprintf(tristate,"%s%s=Y\n",
 864                                             CONFIG_, sym->name);
 865                                 fprintf(out_h, "#define %s%s 1\n",
 866                                     CONFIG_, sym->name);
 867                                 break;
 868                         }
 869                         break;
 870                 case S_STRING:
 871                         conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
 872                         break;
 873                 case S_HEX:
 874                         str = sym_get_string_value(sym);
 875                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 876                                 fprintf(out_h, "#define %s%s 0x%s\n",
 877                                     CONFIG_, sym->name, str);
 878                                 break;
 879                         }
 880                 case S_INT:
 881                         str = sym_get_string_value(sym);
 882                         fprintf(out_h, "#define %s%s %s\n",
 883                             CONFIG_, sym->name, str);
 884                         break;
 885                 default:
 886                         break;
 887                 }
 888         }
 889         fclose(out);
 890         fclose(tristate);
 891         fclose(out_h);
 892
 893         name = getenv("KCONFIG_AUTOHEADER");
 894         if (!name)
 895                 name = "include/generated/autoconf.h";
 896         if (rename(".tmpconfig.h", name))
 897                 return 1;
 898         name = getenv("KCONFIG_TRISTATE");
 899         if (!name)
 900                 name = "include/config/tristate.conf";
 901         if (rename(".tmpconfig_tristate", name))
 902                 return 1;
 903         name = conf_get_autoconfig_name();
 904         /*
 905          * This must be the last step, kbuild has a dependency on auto.conf
 906          * and this marks the successful completion of the previous steps.
 907          */
 908         if (rename(".tmpconfig", name))
 909                 return 1;
 910
 911         return 0;
 912 }
 913
 914 static int sym_change_count;
 915 static void (*conf_changed_callback)(void);
 916
 917 void sym_set_change_count(int count)
 918 {
 919         int _sym_change_count = sym_change_count;
 920         sym_change_count = count;
 921         if (conf_changed_callback &&
 922             (bool)_sym_change_count != (bool)count)
 923                 conf_changed_callback();
 924 }
 925
 926 void sym_add_change_count(int count)
 927 {
 928         sym_set_change_count(count + sym_change_count);
 929 }
 930
 931 bool conf_get_changed(void)
 932 {
 933         return sym_change_count;
 934 }
 935
 936 void conf_set_changed_callback(void (*fn)(void))
 937 {
 938         conf_changed_callback = fn;
 939 }
 940
 941 static void randomize_choice_values(struct symbol *csym)
 942 {
 943         struct property *prop;
 944         struct symbol *sym;
 945         struct expr *e;
 946         int cnt, def;
 947
 948         /*
 949          * If choice is mod then we may have more items selected
 950          * and if no then no-one.
 951          * In both cases stop.
 952          */
 953         if (csym->curr.tri != yes)
 954                 return;
 955
 956         prop = sym_get_choice_prop(csym);
 957
 958         /* count entries in choice block */
 959         cnt = 0;
 960         expr_list_for_each_sym(prop->expr, e, sym)
 961                 cnt++;
 962
 963         /*
 964          * find a random value and set it to yes,
 965          * set the rest to no so we have only one set
 966          */
 967         def = (rand() % cnt);
 968
 969         cnt = 0;
 970         expr_list_for_each_sym(prop->expr, e, sym) {
 971                 if (def == cnt++) {
 972                         sym->def[S_DEF_USER].tri = yes;
 973                         csym->def[S_DEF_USER].val = sym;
 974                 }
 975                 else {
 976                         sym->def[S_DEF_USER].tri = no;
 977                 }
 978         }
 979         csym->flags |= SYMBOL_DEF_USER;
 980         /* clear VALID to get value calculated */
 981         csym->flags &= ~(SYMBOL_VALID);
 982 }
 983
 984 static void set_all_choice_values(struct symbol *csym)
 985 {
 986         struct property *prop;
 987         struct symbol *sym;
 988         struct expr *e;
 989
 990         prop = sym_get_choice_prop(csym);
 991
 992         /*
 993          * Set all non-assinged choice values to no
 994          */
 995         expr_list_for_each_sym(prop->expr, e, sym) {
 996                 if (!sym_has_value(sym))
 997                         sym->def[S_DEF_USER].tri = no;
 998         }
 999         csym->flags |= SYMBOL_DEF_USER;
1000         /* clear VALID to get value calculated */
1001         csym->flags &= ~(SYMBOL_VALID);
1002 }
1003
1004 void conf_set_all_new_symbols(enum conf_def_mode mode)
1005 {
1006         struct symbol *sym, *csym;
1007         int i, cnt;
1008
1009         for_all_symbols(i, sym) {
1010                 if (sym_has_value(sym))
1011                         continue;
1012                 switch (sym_get_type(sym)) {
1013                 case S_BOOLEAN:
1014                 case S_TRISTATE:
1015                         switch (mode) {
1016                         case def_yes:
1017                                 sym->def[S_DEF_USER].tri = yes;
1018                                 break;
1019                         case def_mod:
1020                                 sym->def[S_DEF_USER].tri = mod;
1021                                 break;
1022                         case def_no:
1023                                 sym->def[S_DEF_USER].tri = no;
1024                                 break;
1025                         case def_random:
1026                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1027                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1028                                 break;
1029                         default:
1030                                 continue;
1031                         }
1032                         if (!(sym_is_choice(sym) && mode == def_random))
1033                                 sym->flags |= SYMBOL_DEF_USER;
1034                         break;
1035                 default:
1036                         break;
1037                 }
1038
1039         }
1040
1041         sym_clear_all_valid();
1042
1043         /*
1044          * We have different type of choice blocks.
1045          * If curr.tri equal to mod then we can select several
1046          * choice symbols in one block.
1047          * In this case we do nothing.
1048          * If curr.tri equal yes then only one symbol can be
1049          * selected in a choice block and we set it to yes,
1050          * and the rest to no.
1051          */
1052         for_all_symbols(i, csym) {
1053                 if (sym_has_value(csym) || !sym_is_choice(csym))
1054                         continue;
1055
1056                 sym_calc_value(csym);
1057                 if (mode == def_random)
1058                         randomize_choice_values(csym);
1059                 else
1060                         set_all_choice_values(csym);
1061         }
1062 }