config/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 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[] = "include/generated/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/generated/auto.conf";
  76 }
  77
  78 static char *conf_expand_value(const char *in)
  79 {
  80         struct symbol *sym;
  81         const char *src;
  82         static char res_value[SYMBOL_MAXLENGTH];
  83         char *dst, name[SYMBOL_MAXLENGTH];
  84
  85         res_value[0] = 0;
  86         dst = name;
  87         while ((src = strchr(in, '$'))) {
  88                 strncat(res_value, in, src - in);
  89                 src++;
  90                 dst = name;
  91                 while (isalnum(*src) || *src == '_')
  92                         *dst++ = *src++;
  93                 *dst = 0;
  94                 sym = sym_lookup(name, 0);
  95                 sym_calc_value(sym);
  96                 strcat(res_value, sym_get_string_value(sym));
  97                 in = src;
  98         }
  99         strcat(res_value, in);
 100
 101         return res_value;
 102 }
 103
 104 char *conf_get_default_confname(void)
 105 {
 106         struct stat buf;
 107         static char fullname[PATH_MAX+1];
 108         char *env, *name;
 109
 110         name = conf_expand_value(conf_defname);
 111         env = getenv(SRCTREE);
 112         if (env) {
 113                 sprintf(fullname, "%s/%s", env, name);
 114                 if (!stat(fullname, &buf))
 115                         return fullname;
 116         }
 117         return name;
 118 }
 119
 120 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 121 {
 122         char *p2;
 123
 124         switch (sym->type) {
 125         case S_TRISTATE:
 126                 if (p[0] == 'm') {
 127                         sym->def[def].tri = mod;
 128                         sym->flags |= def_flags;
 129                         break;
 130                 }
 131                 /* fall through */
 132         case S_BOOLEAN:
 133                 if (p[0] == 'y') {
 134                         sym->def[def].tri = yes;
 135                         sym->flags |= def_flags;
 136                         break;
 137                 }
 138                 if (p[0] == 'n') {
 139                         sym->def[def].tri = no;
 140                         sym->flags |= def_flags;
 141                         break;
 142                 }
 143                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 144                 return 1;
 145         case S_OTHER:
 146                 if (*p != '"') {
 147                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 148                                 ;
 149                         sym->type = S_STRING;
 150                         goto done;
 151                 }
 152                 /* fall through */
 153         case S_STRING:
 154                 if (*p++ != '"')
 155                         break;
 156                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 157                         if (*p2 == '"') {
 158                                 *p2 = 0;
 159                                 break;
 160                         }
 161                         memmove(p2, p2 + 1, strlen(p2));
 162                 }
 163                 if (!p2) {
 164                         conf_warning("invalid string found");
 165                         return 1;
 166                 }
 167                 /* fall through */
 168         case S_INT:
 169         case S_HEX:
 170         done:
 171                 if (sym_string_valid(sym, p)) {
 172                         sym->def[def].val = strdup(p);
 173                         sym->flags |= def_flags;
 174                 } else {
 175                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 176                         return 1;
 177                 }
 178                 break;
 179         default:
 180                 ;
 181         }
 182         return 0;
 183 }
 184
 185 int conf_read_simple(const char *name, int def)
 186 {
 187         FILE *in = NULL;
 188         char line[1024];
 189         char *p, *p2;
 190         struct symbol *sym;
 191         int i, def_flags;
 192
 193         if (name) {
 194                 in = zconf_fopen(name);
 195         } else {
 196                 struct property *prop;
 197
 198                 name = conf_get_configname();
 199                 in = zconf_fopen(name);
 200                 if (in)
 201                         goto load;
 202                 sym_add_change_count(1);
 203                 if (!sym_defconfig_list) {
 204                         if (modules_sym)
 205                                 sym_calc_value(modules_sym);
 206                         return 1;
 207                 }
 208
 209                 for_all_defaults(sym_defconfig_list, prop) {
 210                         if (expr_calc_value(prop->visible.expr) == no ||
 211                             prop->expr->type != E_SYMBOL)
 212                                 continue;
 213                         name = conf_expand_value(prop->expr->left.sym->name);
 214                         in = zconf_fopen(name);
 215                         if (in) {
 216                                 conf_message(_("using defaults found in %s"),
 217                                          name);
 218                                 goto load;
 219                         }
 220                 }
 221         }
 222         if (!in)
 223                 return 1;
 224
 225 load:
 226         conf_filename = name;
 227         conf_lineno = 0;
 228         conf_warnings = 0;
 229         conf_unsaved = 0;
 230
 231         def_flags = SYMBOL_DEF << def;
 232         for_all_symbols(i, sym) {
 233                 sym->flags |= SYMBOL_CHANGED;
 234                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 235                 if (sym_is_choice(sym))
 236                         sym->flags |= def_flags;
 237                 switch (sym->type) {
 238                 case S_INT:
 239                 case S_HEX:
 240                 case S_STRING:
 241                         if (sym->def[def].val)
 242                                 free(sym->def[def].val);
 243                         /* fall through */
 244                 default:
 245                         sym->def[def].val = NULL;
 246                         sym->def[def].tri = no;
 247                 }
 248         }
 249
 250         while (fgets(line, sizeof(line), in)) {
 251                 conf_lineno++;
 252                 sym = NULL;
 253                 if (line[0] == '#') {
 254                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 255                                 continue;
 256                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 257                         if (!p)
 258                                 continue;
 259                         *p++ = 0;
 260                         if (strncmp(p, "is not set", 10))
 261                                 continue;
 262                         if (def == S_DEF_USER) {
 263                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 264                                 if (!sym) {
 265                                         sym_add_change_count(1);
 266                                         goto setsym;
 267                                 }
 268                         } else {
 269                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 270                                 if (sym->type == S_UNKNOWN)
 271                                         sym->type = S_BOOLEAN;
 272                         }
 273                         if (sym->flags & def_flags) {
 274                                 conf_warning("override: reassigning to symbol %s", sym->name);
 275                         }
 276                         switch (sym->type) {
 277                         case S_BOOLEAN:
 278                         case S_TRISTATE:
 279                                 sym->def[def].tri = no;
 280                                 sym->flags |= def_flags;
 281                                 break;
 282                         default:
 283                                 ;
 284                         }
 285                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 286                         p = strchr(line + strlen(CONFIG_), '=');
 287                         if (!p)
 288                                 continue;
 289                         *p++ = 0;
 290                         p2 = strchr(p, '\n');
 291                         if (p2) {
 292                                 *p2-- = 0;
 293                                 if (*p2 == '\r')
 294                                         *p2 = 0;
 295                         }
 296                         if (def == S_DEF_USER) {
 297                                 sym = sym_find(line + strlen(CONFIG_));
 298                                 if (!sym) {
 299                                         sym_add_change_count(1);
 300                                         goto setsym;
 301                                 }
 302                         } else {
 303                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 304                                 if (sym->type == S_UNKNOWN)
 305                                         sym->type = S_OTHER;
 306                         }
 307                         if (sym->flags & def_flags) {
 308                                 conf_warning("override: reassigning to symbol %s", sym->name);
 309                         }
 310                         if (conf_set_sym_val(sym, def, def_flags, p))
 311                                 continue;
 312                 } else {
 313                         if (line[0] != '\r' && line[0] != '\n')
 314                                 conf_warning("unexpected data");
 315                         continue;
 316                 }
 317 setsym:
 318                 if (sym && sym_is_choice_value(sym)) {
 319                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 320                         switch (sym->def[def].tri) {
 321                         case no:
 322                                 break;
 323                         case mod:
 324                                 if (cs->def[def].tri == yes) {
 325                                         conf_warning("%s creates inconsistent choice state", sym->name);
 326                                         cs->flags &= ~def_flags;
 327                                 }
 328                                 break;
 329                         case yes:
 330                                 if (cs->def[def].tri != no)
 331                                         conf_warning("override: %s changes choice state", sym->name);
 332                                 cs->def[def].val = sym;
 333                                 break;
 334                         }
 335                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 336                 }
 337         }
 338         fclose(in);
 339
 340         if (modules_sym)
 341                 sym_calc_value(modules_sym);
 342         return 0;
 343 }
 344
 345 int conf_read(const char *name)
 346 {
 347         struct symbol *sym;
 348         int i;
 349
 350         sym_set_change_count(0);
 351
 352         if (conf_read_simple(name, S_DEF_USER))
 353                 return 1;
 354
 355         for_all_symbols(i, sym) {
 356                 sym_calc_value(sym);
 357                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 358                         continue;
 359                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 360                         /* check that calculated value agrees with saved value */
 361                         switch (sym->type) {
 362                         case S_BOOLEAN:
 363                         case S_TRISTATE:
 364                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 365                                         break;
 366                                 if (!sym_is_choice(sym))
 367                                         continue;
 368                                 /* fall through */
 369                         default:
 370                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 371                                         continue;
 372                                 break;
 373                         }
 374                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 375                         /* no previous value and not saved */
 376                         continue;
 377                 conf_unsaved++;
 378                 /* maybe print value in verbose mode... */
 379         }
 380
 381         for_all_symbols(i, sym) {
 382                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 383                         /* Reset values of generates values, so they'll appear
 384                          * as new, if they should become visible, but that
 385                          * doesn't quite work if the Kconfig and the saved
 386                          * configuration disagree.
 387                          */
 388                         if (sym->visible == no && !conf_unsaved)
 389                                 sym->flags &= ~SYMBOL_DEF_USER;
 390                         switch (sym->type) {
 391                         case S_STRING:
 392                         case S_INT:
 393                         case S_HEX:
 394                                 /* Reset a string value if it's out of range */
 395                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 396                                         break;
 397                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 398                                 conf_unsaved++;
 399                                 break;
 400                         default:
 401                                 break;
 402                         }
 403                 }
 404         }
 405
 406         sym_add_change_count(conf_warnings || conf_unsaved);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * Kconfig configuration printer
 413  *
 414  * This printer is used when generating the resulting configuration after
 415  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 416  * passing a non-NULL argument to the printer.
 417  *
 418  */
 419 static void
 420 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 421 {
 422
 423         switch (sym->type) {
 424         case S_BOOLEAN:
 425         case S_TRISTATE:
 426                 if (*value == 'n') {
 427                         bool skip_unset = (arg != NULL);
 428
 429                         if (!skip_unset)
 430                                 fprintf(fp, "# %s%s is not set\n",
 431                                     CONFIG_, sym->name);
 432                         return;
 433                 }
 434                 break;
 435         default:
 436                 break;
 437         }
 438
 439         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 440 }
 441
 442 static void
 443 kconfig_print_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 444 {
 445
 446         switch (sym->type) {
 447         case S_BOOLEAN:
 448         case S_TRISTATE:
 449                 if (*value == 'n') {
 450                         bool skip_unset = (arg != NULL);
 451
 452                         if (!skip_unset)
 453                                 fprintf(fp, "set(%s%s false)\n",
 454                                         CONFIG_, sym->name, value);
 455                         return;
 456                 } else if (*value == 'm') {
 457                         abort();
 458                 } else {
 459                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 460                 }
 461                 break;
 462         case S_HEX: {
 463                 const char *prefix = "";
 464
 465                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 466                         prefix = "0x";
 467                 fprintf(fp, "set(%s%s %s%s)\n",
 468                     CONFIG_, sym->name, prefix, value);
 469                 break;
 470         }
 471         case S_STRING:
 472         case S_INT:
 473                 fprintf(fp, "set(%s%s %s)\n",
 474                     CONFIG_, sym->name, value);
 475                 break;
 476         default:
 477                 break;
 478         }
 479
 480 }
 481
 482 static void
 483 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 484 {
 485         const char *p = value;
 486         size_t l;
 487
 488         for (;;) {
 489                 l = strcspn(p, "\n");
 490                 fprintf(fp, "#");
 491                 if (l) {
 492                         fprintf(fp, " ");
 493                         xfwrite(p, l, 1, fp);
 494                         p += l;
 495                 }
 496                 fprintf(fp, "\n");
 497                 if (*p++ == '\0')
 498                         break;
 499         }
 500 }
 501
 502 static struct conf_printer kconfig_printer_cb =
 503 {
 504         .print_symbol = kconfig_print_symbol,
 505         .print_comment = kconfig_print_comment,
 506 };
 507
 508 static struct conf_printer kconfig_printer_cmake_cb =
 509 {
 510         .print_symbol = kconfig_print_cmake_symbol,
 511         .print_comment = kconfig_print_comment,
 512 };
 513
 514 /*
 515  * Header printer
 516  *
 517  * This printer is used when generating the `include/generated/autoconf.h' file.
 518  */
 519 static void
 520 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 521 {
 522
 523         switch (sym->type) {
 524         case S_BOOLEAN:
 525         case S_TRISTATE: {
 526                 const char *suffix = "";
 527
 528                 switch (*value) {
 529                 case 'n':
 530                         break;
 531                 case 'm':
 532                         suffix = "_MODULE";
 533                         /* fall through */
 534                 default:
 535                         fprintf(fp, "#define %s%s%s 1\n",
 536                             CONFIG_, sym->name, suffix);
 537                 }
 538                 break;
 539         }
 540         case S_HEX: {
 541                 const char *prefix = "";
 542
 543                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 544                         prefix = "0x";
 545                 fprintf(fp, "#define %s%s %s%s\n",
 546                     CONFIG_, sym->name, prefix, value);
 547                 break;
 548         }
 549         case S_STRING:
 550         case S_INT:
 551                 fprintf(fp, "#define %s%s %s\n",
 552                     CONFIG_, sym->name, value);
 553                 break;
 554         default:
 555                 break;
 556         }
 557
 558 }
 559
 560 static void
 561 header_print_comment(FILE *fp, const char *value, void *arg)
 562 {
 563         const char *p = value;
 564         size_t l;
 565
 566         fprintf(fp, "/*\n");
 567         for (;;) {
 568                 l = strcspn(p, "\n");
 569                 fprintf(fp, " *");
 570                 if (l) {
 571                         fprintf(fp, " ");
 572                         xfwrite(p, l, 1, fp);
 573                         p += l;
 574                 }
 575                 fprintf(fp, "\n");
 576                 if (*p++ == '\0')
 577                         break;
 578         }
 579         fprintf(fp, " */\n");
 580 }
 581
 582 static struct conf_printer header_printer_cb =
 583 {
 584         .print_symbol = header_print_symbol,
 585         .print_comment = header_print_comment,
 586 };
 587
 588 /*
 589  * Generate the __enabled_CONFIG_* and __enabled_CONFIG_*_MODULE macros for
 590  * use by the IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
 591  * generated even for booleans so that the IS_ENABLED() macro works.
 592  */
 593 static void
 594 header_print__enabled_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 595 {
 596
 597         switch (sym->type) {
 598         case S_BOOLEAN:
 599         case S_TRISTATE: {
 600                 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
 601                     sym->name, (*value == 'y'));
 602                 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
 603                     sym->name, (*value == 'm'));
 604                 break;
 605         }
 606         default:
 607                 break;
 608         }
 609 }
 610
 611 static struct conf_printer header__enabled_printer_cb =
 612 {
 613         .print_symbol = header_print__enabled_symbol,
 614         .print_comment = header_print_comment,
 615 };
 616
 617 /*
 618  * Tristate printer
 619  *
 620  * This printer is used when generating the `include/generated/tristate.conf' file.
 621  */
 622 static void
 623 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 624 {
 625
 626         if (sym->type == S_TRISTATE && *value != 'n')
 627                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 628 }
 629
 630 static struct conf_printer tristate_printer_cb =
 631 {
 632         .print_symbol = tristate_print_symbol,
 633         .print_comment = kconfig_print_comment,
 634 };
 635
 636 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 637                               struct conf_printer *printer, void *printer_arg)
 638 {
 639         const char *str;
 640
 641         switch (sym->type) {
 642         case S_OTHER:
 643         case S_UNKNOWN:
 644                 break;
 645         case S_STRING:
 646                 str = sym_get_string_value(sym);
 647                 str = sym_escape_string_value(str);
 648                 printer->print_symbol(fp, sym, str, printer_arg);
 649                 free((void *)str);
 650                 break;
 651         default:
 652                 str = sym_get_string_value(sym);
 653                 printer->print_symbol(fp, sym, str, printer_arg);
 654         }
 655 }
 656
 657 static void
 658 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 659 {
 660         char buf[256];
 661
 662         snprintf(buf, sizeof(buf),
 663             "\n"
 664             "Automatically generated file; DO NOT EDIT.\n"
 665             "%s\n",
 666             rootmenu.prompt->text);
 667
 668         printer->print_comment(fp, buf, printer_arg);
 669 }
 670
 671 /*
 672  * Write out a minimal config.
 673  * All values that has default values are skipped as this is redundant.
 674  */
 675 int conf_write_defconfig(const char *filename)
 676 {
 677         struct symbol *sym;
 678         struct menu *menu;
 679         FILE *out;
 680
 681         out = fopen(filename, "w");
 682         if (!out)
 683                 return 1;
 684
 685         sym_clear_all_valid();
 686
 687         /* Traverse all menus to find all relevant symbols */
 688         menu = rootmenu.list;
 689
 690         while (menu != NULL)
 691         {
 692                 sym = menu->sym;
 693                 if (sym == NULL) {
 694                         if (!menu_is_visible(menu))
 695                                 goto next_menu;
 696                 } else if (!sym_is_choice(sym)) {
 697                         sym_calc_value(sym);
 698                         if (!(sym->flags & SYMBOL_WRITE))
 699                                 goto next_menu;
 700                         sym->flags &= ~SYMBOL_WRITE;
 701                         /* If we cannot change the symbol - skip */
 702                         if (!sym_is_changable(sym))
 703                                 goto next_menu;
 704                         /* If symbol equals to default value - skip */
 705                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 706                                 goto next_menu;
 707
 708                         /*
 709                          * If symbol is a choice value and equals to the
 710                          * default for a choice - skip.
 711                          * But only if value is bool and equal to "y" and
 712                          * choice is not "optional".
 713                          * (If choice is "optional" then all values can be "n")
 714                          */
 715                         if (sym_is_choice_value(sym)) {
 716                                 struct symbol *cs;
 717                                 struct symbol *ds;
 718
 719                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 720                                 ds = sym_choice_default(cs);
 721                                 if (!sym_is_optional(cs) && sym == ds) {
 722                                         if ((sym->type == S_BOOLEAN) &&
 723                                             sym_get_tristate_value(sym) == yes)
 724                                                 goto next_menu;
 725                                 }
 726                         }
 727                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 728                 }
 729 next_menu:
 730                 if (menu->list != NULL) {
 731                         menu = menu->list;
 732                 }
 733                 else if (menu->next != NULL) {
 734                         menu = menu->next;
 735                 } else {
 736                         while ((menu = menu->parent)) {
 737                                 if (menu->next != NULL) {
 738                                         menu = menu->next;
 739                                         break;
 740                                 }
 741                         }
 742                 }
 743         }
 744         fclose(out);
 745         return 0;
 746 }
 747
 748 int conf_write(const char *name)
 749 {
 750         FILE *out;
 751         struct symbol *sym;
 752         struct menu *menu;
 753         const char *basename;
 754         const char *str;
 755         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 756         char *env;
 757
 758         dirname[0] = 0;
 759         if (name && name[0]) {
 760                 struct stat st;
 761                 char *slash;
 762
 763                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 764                         strcpy(dirname, name);
 765                         strcat(dirname, "/");
 766                         basename = conf_get_configname();
 767                 } else if ((slash = strrchr(name, '/'))) {
 768                         int size = slash - name + 1;
 769                         memcpy(dirname, name, size);
 770                         dirname[size] = 0;
 771                         if (slash[1])
 772                                 basename = slash + 1;
 773                         else
 774                                 basename = conf_get_configname();
 775                 } else
 776                         basename = name;
 777         } else
 778                 basename = conf_get_configname();
 779
 780         sprintf(newname, "%s%s", dirname, basename);
 781         env = getenv("KCONFIG_OVERWRITECONFIG");
 782         if (!env || !*env) {
 783                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 784                 out = fopen(tmpname, "w");
 785         } else {
 786                 *tmpname = 0;
 787                 out = fopen(newname, "w");
 788         }
 789         if (!out)
 790                 return 1;
 791
 792         conf_write_heading(out, &kconfig_printer_cb, NULL);
 793
 794         if (!conf_get_changed())
 795                 sym_clear_all_valid();
 796
 797         menu = rootmenu.list;
 798         while (menu) {
 799                 sym = menu->sym;
 800                 if (!sym) {
 801                         if (!menu_is_visible(menu))
 802                                 goto next;
 803                         str = menu_get_prompt(menu);
 804                         fprintf(out, "\n"
 805                                      "#\n"
 806                                      "# %s\n"
 807                                      "#\n", str);
 808                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 809                         sym_calc_value(sym);
 810                         if (!(sym->flags & SYMBOL_WRITE))
 811                                 goto next;
 812                         sym->flags &= ~SYMBOL_WRITE;
 813
 814                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 815                 }
 816
 817 next:
 818                 if (menu->list) {
 819                         menu = menu->list;
 820                         continue;
 821                 }
 822                 if (menu->next)
 823                         menu = menu->next;
 824                 else while ((menu = menu->parent)) {
 825                         if (menu->next) {
 826                                 menu = menu->next;
 827                                 break;
 828                         }
 829                 }
 830         }
 831         fclose(out);
 832
 833         if (*tmpname) {
 834                 strcat(dirname, basename);
 835                 strcat(dirname, ".old");
 836                 rename(newname, dirname);
 837                 if (rename(tmpname, newname))
 838                         return 1;
 839         }
 840
 841         conf_message(_("configuration written to %s"), newname);
 842
 843         sym_set_change_count(0);
 844
 845         return 0;
 846 }
 847
 848 static int conf_split_config(void)
 849 {
 850         const char *name;
 851         char path[PATH_MAX+1];
 852         char *s, *d, c;
 853         struct symbol *sym;
 854         struct stat sb;
 855         int res, i, fd;
 856
 857         name = conf_get_autoconfig_name();
 858         conf_read_simple(name, S_DEF_AUTO);
 859
 860         if (chdir("include/generated"))
 861                 return 1;
 862
 863         res = 0;
 864         for_all_symbols(i, sym) {
 865                 sym_calc_value(sym);
 866                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 867                         continue;
 868                 if (sym->flags & SYMBOL_WRITE) {
 869                         if (sym->flags & SYMBOL_DEF_AUTO) {
 870                                 /*
 871                                  * symbol has old and new value,
 872                                  * so compare them...
 873                                  */
 874                                 switch (sym->type) {
 875                                 case S_BOOLEAN:
 876                                 case S_TRISTATE:
 877                                         if (sym_get_tristate_value(sym) ==
 878                                             sym->def[S_DEF_AUTO].tri)
 879                                                 continue;
 880                                         break;
 881                                 case S_STRING:
 882                                 case S_HEX:
 883                                 case S_INT:
 884                                         if (!strcmp(sym_get_string_value(sym),
 885                                                     sym->def[S_DEF_AUTO].val))
 886                                                 continue;
 887                                         break;
 888                                 default:
 889                                         break;
 890                                 }
 891                         } else {
 892                                 /*
 893                                  * If there is no old value, only 'no' (unset)
 894                                  * is allowed as new value.
 895                                  */
 896                                 switch (sym->type) {
 897                                 case S_BOOLEAN:
 898                                 case S_TRISTATE:
 899                                         if (sym_get_tristate_value(sym) == no)
 900                                                 continue;
 901                                         break;
 902                                 default:
 903                                         break;
 904                                 }
 905                         }
 906                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 907                         /* There is neither an old nor a new value. */
 908                         continue;
 909                 /* else
 910                  *      There is an old value, but no new value ('no' (unset)
 911                  *      isn't saved in auto.conf, so the old value is always
 912                  *      different from 'no').
 913                  */
 914
 915                 /* Replace all '_' and append ".h" */
 916                 s = sym->name;
 917                 d = path;
 918                 while ((c = *s++)) {
 919                         c = tolower(c);
 920                         *d++ = (c == '_') ? '/' : c;
 921                 }
 922                 strcpy(d, ".h");
 923
 924                 /* Assume directory path already exists. */
 925                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 926                 if (fd == -1) {
 927                         if (errno != ENOENT) {
 928                                 res = 1;
 929                                 break;
 930                         }
 931                         /*
 932                          * Create directory components,
 933                          * unless they exist already.
 934                          */
 935                         d = path;
 936                         while ((d = strchr(d, '/'))) {
 937                                 *d = 0;
 938                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 939                                         res = 1;
 940                                         goto out;
 941                                 }
 942                                 *d++ = '/';
 943                         }
 944                         /* Try it again. */
 945                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 946                         if (fd == -1) {
 947                                 res = 1;
 948                                 break;
 949                         }
 950                 }
 951                 close(fd);
 952         }
 953 out:
 954         if (chdir("../.."))
 955                 return 1;
 956
 957         return res;
 958 }
 959
 960 int conf_write_autoconf(void)
 961 {
 962         struct symbol *sym;
 963         const char *name;
 964         FILE *out, *tristate, *out_h, *out_c;
 965         int i;
 966
 967         sym_clear_all_valid();
 968
 969         file_write_dep("include/generated/auto.conf.cmd");
 970
 971         if (conf_split_config())
 972                 return 1;
 973
 974         out = fopen(".tmpconfig", "w");
 975         if (!out)
 976                 return 1;
 977
 978         tristate = fopen(".tmpconfig_tristate", "w");
 979         if (!tristate) {
 980                 fclose(out);
 981                 return 1;
 982         }
 983
 984         out_h = fopen(".tmpconfig.h", "w");
 985         if (!out_h) {
 986                 fclose(out);
 987                 fclose(tristate);
 988                 return 1;
 989         }
 990
 991         out_c = fopen(".tmpconfig.cmake", "w");
 992         if (!out_c) {
 993                 fclose(out);
 994                 fclose(tristate);
 995                 fclose(out_h);
 996         }
 997
 998         conf_write_heading(out, &kconfig_printer_cb, NULL);
 999
1000         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1001
1002         conf_write_heading(out_h, &header_printer_cb, NULL);
1003
1004         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1005
1006         for_all_symbols(i, sym) {
1007                 if (!sym->name)
1008                         continue;
1009
1010                 sym_calc_value(sym);
1011
1012                 conf_write_symbol(out_h, sym, &header__enabled_printer_cb, NULL);
1013
1014                 if (!(sym->flags & SYMBOL_WRITE))
1015                         continue;
1016
1017                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1018
1019                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1020
1021                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1022
1023                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1024         }
1025         fclose(out);
1026         fclose(tristate);
1027         fclose(out_h);
1028         fclose(out_c);
1029
1030         name = getenv("KCONFIG_AUTOHEADER");
1031         if (!name)
1032                 name = "include/generated/autoconf.h";
1033         if (rename(".tmpconfig.h", name))
1034                 return 1;
1035         name = getenv("KCONFIG_TRISTATE");
1036         if (!name)
1037                 name = "include/generated/tristate.conf";
1038         if (rename(".tmpconfig_tristate", name))
1039                 return 1;
1040         name = getenv("KCONFIG_CMAKE");
1041         if (!name)
1042                 name = "config.cmake";
1043         if (rename(".tmpconfig.cmake", name))
1044                 return 1;
1045         name = conf_get_autoconfig_name();
1046         /*
1047          * This must be the last step, kbuild has a dependency on auto.conf
1048          * and this marks the successful completion of the previous steps.
1049          */
1050         if (rename(".tmpconfig", name))
1051                 return 1;
1052
1053         return 0;
1054 }
1055
1056 static int sym_change_count;
1057 static void (*conf_changed_callback)(void);
1058
1059 void sym_set_change_count(int count)
1060 {
1061         int _sym_change_count = sym_change_count;
1062         sym_change_count = count;
1063         if (conf_changed_callback &&
1064             (bool)_sym_change_count != (bool)count)
1065                 conf_changed_callback();
1066 }
1067
1068 void sym_add_change_count(int count)
1069 {
1070         sym_set_change_count(count + sym_change_count);
1071 }
1072
1073 bool conf_get_changed(void)
1074 {
1075         return sym_change_count;
1076 }
1077
1078 void conf_set_changed_callback(void (*fn)(void))
1079 {
1080         conf_changed_callback = fn;
1081 }
1082
1083 static void randomize_choice_values(struct symbol *csym)
1084 {
1085         struct property *prop;
1086         struct symbol *sym;
1087         struct expr *e;
1088         int cnt, def;
1089
1090         /*
1091          * If choice is mod then we may have more items selected
1092          * and if no then no-one.
1093          * In both cases stop.
1094          */
1095         if (csym->curr.tri != yes)
1096                 return;
1097
1098         prop = sym_get_choice_prop(csym);
1099
1100         /* count entries in choice block */
1101         cnt = 0;
1102         expr_list_for_each_sym(prop->expr, e, sym)
1103                 cnt++;
1104
1105         /*
1106          * find a random value and set it to yes,
1107          * set the rest to no so we have only one set
1108          */
1109         def = (rand() % cnt);
1110
1111         cnt = 0;
1112         expr_list_for_each_sym(prop->expr, e, sym) {
1113                 if (def == cnt++) {
1114                         sym->def[S_DEF_USER].tri = yes;
1115                         csym->def[S_DEF_USER].val = sym;
1116                 }
1117                 else {
1118                         sym->def[S_DEF_USER].tri = no;
1119                 }
1120         }
1121         csym->flags |= SYMBOL_DEF_USER;
1122         /* clear VALID to get value calculated */
1123         csym->flags &= ~(SYMBOL_VALID);
1124 }
1125
1126 static void set_all_choice_values(struct symbol *csym)
1127 {
1128         struct property *prop;
1129         struct symbol *sym;
1130         struct expr *e;
1131
1132         prop = sym_get_choice_prop(csym);
1133
1134         /*
1135          * Set all non-assinged choice values to no
1136          */
1137         expr_list_for_each_sym(prop->expr, e, sym) {
1138                 if (!sym_has_value(sym))
1139                         sym->def[S_DEF_USER].tri = no;
1140         }
1141         csym->flags |= SYMBOL_DEF_USER;
1142         /* clear VALID to get value calculated */
1143         csym->flags &= ~(SYMBOL_VALID);
1144 }
1145
1146 void conf_set_all_new_symbols(enum conf_def_mode mode)
1147 {
1148         struct symbol *sym, *csym;
1149         int i, cnt;
1150
1151         for_all_symbols(i, sym) {
1152                 if (sym_has_value(sym))
1153                         continue;
1154                 switch (sym_get_type(sym)) {
1155                 case S_BOOLEAN:
1156                 case S_TRISTATE:
1157                         switch (mode) {
1158                         case def_yes:
1159                                 sym->def[S_DEF_USER].tri = yes;
1160                                 break;
1161                         case def_mod:
1162                                 sym->def[S_DEF_USER].tri = mod;
1163                                 break;
1164                         case def_no:
1165                                 sym->def[S_DEF_USER].tri = no;
1166                                 break;
1167                         case def_random:
1168                                 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1169                                 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1170                                 break;
1171                         default:
1172                                 continue;
1173                         }
1174                         if (!(sym_is_choice(sym) && mode == def_random))
1175                                 sym->flags |= SYMBOL_DEF_USER;
1176                         break;
1177                 default:
1178                         break;
1179                 }
1180
1181         }
1182
1183         sym_clear_all_valid();
1184
1185         /*
1186          * We have different type of choice blocks.
1187          * If curr.tri equals to mod then we can select several
1188          * choice symbols in one block.
1189          * In this case we do nothing.
1190          * If curr.tri equals yes then only one symbol can be
1191          * selected in a choice block and we set it to yes,
1192          * and the rest to no.
1193          */
1194         for_all_symbols(i, csym) {
1195                 if (sym_has_value(csym) || !sym_is_choice(csym))
1196                         continue;
1197
1198                 sym_calc_value(csym);
1199                 if (mode == def_random)
1200                         randomize_choice_values(csym);
1201                 else
1202                         set_all_choice_values(csym);
1203         }
1204 }