scripts/config/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 struct conf_printer {
  20         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
  21         void (*print_comment)(FILE *, const char *, void *);
  22 };
  23
  24 static void conf_warning(const char *fmt, ...)
  25         __attribute__ ((format (printf, 1, 2)));
  26
  27 static void conf_message(const char *fmt, ...)
  28         __attribute__ ((format (printf, 1, 2)));
  29
  30 static const char *conf_filename;
  31 static int conf_lineno, conf_warnings, conf_unsaved;
  32
  33 const char conf_defname[] = "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 void conf_reset(int def)
 252 {
 253         struct symbol *sym;
 254         int i, def_flags;
 255
 256         def_flags = SYMBOL_DEF << def;
 257         for_all_symbols(i, sym) {
 258                 sym->flags |= SYMBOL_CHANGED;
 259                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 260                 if (sym_is_choice(sym))
 261                         sym->flags |= def_flags;
 262                 switch (sym->type) {
 263                 case S_INT:
 264                 case S_HEX:
 265                 case S_STRING:
 266                         if (sym->def[def].val)
 267                                 free(sym->def[def].val);
 268                         /* fall through */
 269                 default:
 270                         sym->def[def].val = NULL;
 271                         sym->def[def].tri = no;
 272                 }
 273         }
 274 }
 275
 276 int conf_read_simple(const char *name, int def)
 277 {
 278         FILE *in = NULL;
 279         char   *line = NULL;
 280         size_t  line_asize = 0;
 281         char *p, *p2;
 282         struct symbol *sym;
 283         int def_flags;
 284
 285         if (name) {
 286                 in = zconf_fopen(name);
 287         } else {
 288                 struct property *prop;
 289
 290                 name = conf_get_configname();
 291                 in = zconf_fopen(name);
 292                 if (in)
 293                         goto load;
 294                 sym_add_change_count(1);
 295                 if (!sym_defconfig_list)
 296                         return 1;
 297
 298                 for_all_defaults(sym_defconfig_list, prop) {
 299                         if (expr_calc_value(prop->visible.expr) == no ||
 300                             prop->expr->type != E_SYMBOL)
 301                                 continue;
 302                         name = conf_expand_value(prop->expr->left.sym->name);
 303                         in = zconf_fopen(name);
 304                         if (in) {
 305                                 conf_message(_("using defaults found in %s"),
 306                                          name);
 307                                 goto load;
 308                         }
 309                 }
 310         }
 311         if (!in)
 312                 return 1;
 313
 314 load:
 315         conf_filename = name;
 316         conf_lineno = 0;
 317         conf_warnings = 0;
 318         conf_unsaved = 0;
 319
 320         def_flags = SYMBOL_DEF << def;
 321         conf_reset(def);
 322
 323         while (compat_getline(&line, &line_asize, in) != -1) {
 324                 conf_lineno++;
 325                 sym = NULL;
 326                 if (line[0] == '#') {
 327                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 328                                 continue;
 329                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 330                         if (!p)
 331                                 continue;
 332                         *p++ = 0;
 333                         if (strncmp(p, "is not set", 10))
 334                                 continue;
 335                         if (def == S_DEF_USER) {
 336                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 337                                 if (!sym) {
 338                                         sym_add_change_count(1);
 339                                         goto setsym;
 340                                 }
 341                         } else {
 342                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 343                                 if (sym->type == S_UNKNOWN)
 344                                         sym->type = S_BOOLEAN;
 345                         }
 346                         switch (sym->type) {
 347                         case S_BOOLEAN:
 348                         case S_TRISTATE:
 349                                 sym->def[def].tri = no;
 350                                 sym->flags |= def_flags;
 351                                 break;
 352                         default:
 353                                 ;
 354                         }
 355                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 356                         p = strchr(line + strlen(CONFIG_), '=');
 357                         if (!p)
 358                                 continue;
 359                         *p++ = 0;
 360                         p2 = strchr(p, '\n');
 361                         if (p2) {
 362                                 *p2-- = 0;
 363                                 if (*p2 == '\r')
 364                                         *p2 = 0;
 365                         }
 366                         if (def == S_DEF_USER) {
 367                                 sym = sym_find(line + strlen(CONFIG_));
 368                                 if (!sym) {
 369                                         sym_add_change_count(1);
 370                                         goto setsym;
 371                                 }
 372                         } else {
 373                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 374                                 if (sym->type == S_UNKNOWN)
 375                                         sym->type = S_OTHER;
 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: %.*s",
 382                                              (int)strcspn(line, "\r\n"), line);
 383
 384                         continue;
 385                 }
 386 setsym:
 387                 if (sym && sym_is_choice_value(sym)) {
 388                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 389                         switch (sym->def[def].tri) {
 390                         case no:
 391                                 break;
 392                         case mod:
 393                                 if (cs->def[def].tri == yes) {
 394                                         conf_warning("%s creates inconsistent choice state", sym->name);
 395                                         cs->flags &= ~def_flags;
 396                                 }
 397                                 break;
 398                         case yes:
 399                                 if (cs->def[def].tri != no)
 400                                         conf_warning("override: %s changes choice state", sym->name);
 401                                 cs->def[def].val = sym;
 402                                 break;
 403                         }
 404                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 405                 }
 406         }
 407         free(line);
 408         fclose(in);
 409         return 0;
 410 }
 411
 412 int conf_read(const char *name)
 413 {
 414         struct symbol *sym;
 415         int i;
 416
 417         sym_set_change_count(0);
 418
 419         if (conf_read_simple(name, S_DEF_USER)) {
 420                 sym_calc_value(modules_sym);
 421                 return 1;
 422         }
 423
 424         sym_calc_value(modules_sym);
 425
 426         for_all_symbols(i, sym) {
 427                 sym_calc_value(sym);
 428                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 429                         continue;
 430                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 431                         /* check that calculated value agrees with saved value */
 432                         switch (sym->type) {
 433                         case S_BOOLEAN:
 434                         case S_TRISTATE:
 435                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 436                                         break;
 437                                 if (!sym_is_choice(sym))
 438                                         continue;
 439                                 /* fall through */
 440                         default:
 441                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 442                                         continue;
 443                                 break;
 444                         }
 445                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 446                         /* no previous value and not saved */
 447                         continue;
 448                 conf_unsaved++;
 449                 /* maybe print value in verbose mode... */
 450         }
 451
 452         for_all_symbols(i, sym) {
 453                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 454                         /* Reset values of generates values, so they'll appear
 455                          * as new, if they should become visible, but that
 456                          * doesn't quite work if the Kconfig and the saved
 457                          * configuration disagree.
 458                          */
 459                         if (sym->visible == no && !conf_unsaved)
 460                                 sym->flags &= ~SYMBOL_DEF_USER;
 461                         switch (sym->type) {
 462                         case S_STRING:
 463                         case S_INT:
 464                         case S_HEX:
 465                                 /* Reset a string value if it's out of range */
 466                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 467                                         break;
 468                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 469                                 conf_unsaved++;
 470                                 break;
 471                         default:
 472                                 break;
 473                         }
 474                 }
 475         }
 476
 477         sym_add_change_count(conf_warnings || conf_unsaved);
 478
 479         return 0;
 480 }
 481
 482 /*
 483  * Kconfig configuration printer
 484  *
 485  * This printer is used when generating the resulting configuration after
 486  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 487  * passing a non-NULL argument to the printer.
 488  *
 489  */
 490 static void
 491 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 492 {
 493
 494         switch (sym->type) {
 495         case S_BOOLEAN:
 496         case S_TRISTATE:
 497                 if (*value == 'n') {
 498                         bool skip_unset = (arg != NULL);
 499
 500                         if (!skip_unset)
 501                                 fprintf(fp, "# %s%s is not set\n",
 502                                     CONFIG_, sym->name);
 503                         return;
 504                 }
 505                 break;
 506         default:
 507                 break;
 508         }
 509
 510         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 511 }
 512
 513 static void
 514 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 515 {
 516         const char *p = value;
 517         size_t l;
 518
 519         for (;;) {
 520                 l = strcspn(p, "\n");
 521                 fprintf(fp, "#");
 522                 if (l) {
 523                         fprintf(fp, " ");
 524                         xfwrite(p, l, 1, fp);
 525                         p += l;
 526                 }
 527                 fprintf(fp, "\n");
 528                 if (*p++ == '\0')
 529                         break;
 530         }
 531 }
 532
 533 static struct conf_printer kconfig_printer_cb =
 534 {
 535         .print_symbol = kconfig_print_symbol,
 536         .print_comment = kconfig_print_comment,
 537 };
 538
 539 /*
 540  * Header printer
 541  *
 542  * This printer is used when generating the `include/generated/autoconf.h' file.
 543  */
 544 static void
 545 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 546 {
 547
 548         switch (sym->type) {
 549         case S_BOOLEAN:
 550         case S_TRISTATE: {
 551                 const char *suffix = "";
 552
 553                 switch (*value) {
 554                 case 'n':
 555                         break;
 556                 case 'm':
 557                         suffix = "_MODULE";
 558                         /* fall through */
 559                 default:
 560                         fprintf(fp, "#define %s%s%s 1\n",
 561                             CONFIG_, sym->name, suffix);
 562                 }
 563                 break;
 564         }
 565         case S_HEX: {
 566                 const char *prefix = "";
 567
 568                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 569                         prefix = "0x";
 570                 fprintf(fp, "#define %s%s %s%s\n",
 571                     CONFIG_, sym->name, prefix, value);
 572                 break;
 573         }
 574         case S_STRING:
 575         case S_INT:
 576                 fprintf(fp, "#define %s%s %s\n",
 577                     CONFIG_, sym->name, value);
 578                 break;
 579         default:
 580                 break;
 581         }
 582
 583 }
 584
 585 static void
 586 header_print_comment(FILE *fp, const char *value, void *arg)
 587 {
 588         const char *p = value;
 589         size_t l;
 590
 591         fprintf(fp, "/*\n");
 592         for (;;) {
 593                 l = strcspn(p, "\n");
 594                 fprintf(fp, " *");
 595                 if (l) {
 596                         fprintf(fp, " ");
 597                         xfwrite(p, l, 1, fp);
 598                         p += l;
 599                 }
 600                 fprintf(fp, "\n");
 601                 if (*p++ == '\0')
 602                         break;
 603         }
 604         fprintf(fp, " */\n");
 605 }
 606
 607 static struct conf_printer header_printer_cb =
 608 {
 609         .print_symbol = header_print_symbol,
 610         .print_comment = header_print_comment,
 611 };
 612
 613 /*
 614  * Tristate printer
 615  *
 616  * This printer is used when generating the `include/config/tristate.conf' file.
 617  */
 618 static void
 619 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 620 {
 621
 622         if (sym->type == S_TRISTATE && *value != 'n')
 623                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 624 }
 625
 626 static struct conf_printer tristate_printer_cb =
 627 {
 628         .print_symbol = tristate_print_symbol,
 629         .print_comment = kconfig_print_comment,
 630 };
 631
 632 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 633                               struct conf_printer *printer, void *printer_arg)
 634 {
 635         const char *str;
 636
 637         switch (sym->type) {
 638         case S_OTHER:
 639         case S_UNKNOWN:
 640                 break;
 641         case S_STRING:
 642                 str = sym_get_string_value(sym);
 643                 str = sym_escape_string_value(str);
 644                 printer->print_symbol(fp, sym, str, printer_arg);
 645                 free((void *)str);
 646                 break;
 647         default:
 648                 str = sym_get_string_value(sym);
 649                 printer->print_symbol(fp, sym, str, printer_arg);
 650         }
 651 }
 652
 653 static void
 654 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 655 {
 656         char buf[256];
 657
 658         snprintf(buf, sizeof(buf),
 659             "\n"
 660             "Automatically generated file; DO NOT EDIT.\n"
 661             "%s\n",
 662             rootmenu.prompt->text);
 663
 664         printer->print_comment(fp, buf, printer_arg);
 665 }
 666
 667 /*
 668  * Write out a minimal config.
 669  * All values that has default values are skipped as this is redundant.
 670  */
 671 int conf_write_defconfig(const char *filename)
 672 {
 673         struct symbol *sym;
 674         struct menu *menu;
 675         FILE *out;
 676
 677         out = fopen(filename, "w");
 678         if (!out)
 679                 return 1;
 680
 681         sym_clear_all_valid();
 682
 683         /* Traverse all menus to find all relevant symbols */
 684         menu = rootmenu.list;
 685
 686         while (menu != NULL)
 687         {
 688                 sym = menu->sym;
 689                 if (sym == NULL) {
 690                         if (!menu_is_visible(menu))
 691                                 goto next_menu;
 692                 } else if (!sym_is_choice(sym)) {
 693                         sym_calc_value(sym);
 694                         if (!(sym->flags & SYMBOL_WRITE))
 695                                 goto next_menu;
 696                         sym->flags &= ~SYMBOL_WRITE;
 697                         /* If we cannot change the symbol - skip */
 698                         if (!sym_is_changable(sym))
 699                                 goto next_menu;
 700                         /* If symbol equals to default value - skip */
 701                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 702                                 goto next_menu;
 703
 704                         /*
 705                          * If symbol is a choice value and equals to the
 706                          * default for a choice - skip.
 707                          * But only if value is bool and equal to "y" and
 708                          * choice is not "optional".
 709                          * (If choice is "optional" then all values can be "n")
 710                          */
 711                         if (sym_is_choice_value(sym)) {
 712                                 struct symbol *cs;
 713                                 struct symbol *ds;
 714
 715                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 716                                 ds = sym_choice_default(cs);
 717                                 if (!sym_is_optional(cs) && sym == ds) {
 718                                         if ((sym->type == S_BOOLEAN) &&
 719                                             sym_get_tristate_value(sym) == yes)
 720                                                 goto next_menu;
 721                                 }
 722                         }
 723                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 724                 }
 725 next_menu:
 726                 if (menu->list != NULL) {
 727                         menu = menu->list;
 728                 }
 729                 else if (menu->next != NULL) {
 730                         menu = menu->next;
 731                 } else {
 732                         while ((menu = menu->parent)) {
 733                                 if (menu->next != NULL) {
 734                                         menu = menu->next;
 735                                         break;
 736                                 }
 737                         }
 738                 }
 739         }
 740         fclose(out);
 741         return 0;
 742 }
 743
 744 int conf_write(const char *name)
 745 {
 746         FILE *out;
 747         struct symbol *sym;
 748         struct menu *menu;
 749         const char *basename;
 750         const char *str;
 751         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 752         char *env;
 753
 754         dirname[0] = 0;
 755         if (name && name[0]) {
 756                 struct stat st;
 757                 char *slash;
 758
 759                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 760                         strcpy(dirname, name);
 761                         strcat(dirname, "/");
 762                         basename = conf_get_configname();
 763                 } else if ((slash = strrchr(name, '/'))) {
 764                         int size = slash - name + 1;
 765                         memcpy(dirname, name, size);
 766                         dirname[size] = 0;
 767                         if (slash[1])
 768                                 basename = slash + 1;
 769                         else
 770                                 basename = conf_get_configname();
 771                 } else
 772                         basename = name;
 773         } else
 774                 basename = conf_get_configname();
 775
 776         sprintf(newname, "%s%s", dirname, basename);
 777         env = getenv("KCONFIG_OVERWRITECONFIG");
 778         if (!env || !*env) {
 779                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 780                 out = fopen(tmpname, "w");
 781         } else {
 782                 *tmpname = 0;
 783                 out = fopen(newname, "w");
 784         }
 785         if (!out)
 786                 return 1;
 787
 788         conf_write_heading(out, &kconfig_printer_cb, NULL);
 789
 790         if (!conf_get_changed())
 791                 sym_clear_all_valid();
 792
 793         menu = rootmenu.list;
 794         while (menu) {
 795                 sym = menu->sym;
 796                 if (!sym) {
 797                         if (!menu_is_visible(menu))
 798                                 goto next;
 799                         str = menu_get_prompt(menu);
 800                         fprintf(out, "\n"
 801                                      "#\n"
 802                                      "# %s\n"
 803                                      "#\n", str);
 804                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 805                         sym_calc_value(sym);
 806                         if (!(sym->flags & SYMBOL_WRITE))
 807                                 goto next;
 808                         sym->flags &= ~SYMBOL_WRITE;
 809
 810                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 811                 }
 812
 813 next:
 814                 if (menu->list) {
 815                         menu = menu->list;
 816                         continue;
 817                 }
 818                 if (menu->next)
 819                         menu = menu->next;
 820                 else while ((menu = menu->parent)) {
 821                         if (menu->next) {
 822                                 menu = menu->next;
 823                                 break;
 824                         }
 825                 }
 826         }
 827         fclose(out);
 828
 829         if (*tmpname) {
 830                 strcat(dirname, basename);
 831                 strcat(dirname, ".old");
 832                 rename(newname, dirname);
 833                 if (rename(tmpname, newname))
 834                         return 1;
 835         }
 836
 837         conf_message(_("configuration written to %s"), newname);
 838
 839         sym_set_change_count(0);
 840
 841         return 0;
 842 }
 843
 844 static int conf_split_config(void)
 845 {
 846         const char *name;
 847         char path[PATH_MAX+1];
 848         char *s, *d, c;
 849         struct symbol *sym;
 850         struct stat sb;
 851         int res, i, fd;
 852
 853         name = conf_get_autoconfig_name();
 854         conf_read_simple(name, S_DEF_AUTO);
 855         sym_calc_value(modules_sym);
 856
 857         if (chdir("include/config"))
 858                 return 1;
 859
 860         res = 0;
 861         for_all_symbols(i, sym) {
 862                 sym_calc_value(sym);
 863                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 864                         continue;
 865                 if (sym->flags & SYMBOL_WRITE) {
 866                         if (sym->flags & SYMBOL_DEF_AUTO) {
 867                                 /*
 868                                  * symbol has old and new value,
 869                                  * so compare them...
 870                                  */
 871                                 switch (sym->type) {
 872                                 case S_BOOLEAN:
 873                                 case S_TRISTATE:
 874                                         if (sym_get_tristate_value(sym) ==
 875                                             sym->def[S_DEF_AUTO].tri)
 876                                                 continue;
 877                                         break;
 878                                 case S_STRING:
 879                                 case S_HEX:
 880                                 case S_INT:
 881                                         if (!strcmp(sym_get_string_value(sym),
 882                                                     sym->def[S_DEF_AUTO].val))
 883                                                 continue;
 884                                         break;
 885                                 default:
 886                                         break;
 887                                 }
 888                         } else {
 889                                 /*
 890                                  * If there is no old value, only 'no' (unset)
 891                                  * is allowed as new value.
 892                                  */
 893                                 switch (sym->type) {
 894                                 case S_BOOLEAN:
 895                                 case S_TRISTATE:
 896                                         if (sym_get_tristate_value(sym) == no)
 897                                                 continue;
 898                                         break;
 899                                 default:
 900                                         break;
 901                                 }
 902                         }
 903                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 904                         /* There is neither an old nor a new value. */
 905                         continue;
 906                 /* else
 907                  *      There is an old value, but no new value ('no' (unset)
 908                  *      isn't saved in auto.conf, so the old value is always
 909                  *      different from 'no').
 910                  */
 911
 912                 /* Replace all '_' and append ".h" */
 913                 s = sym->name;
 914                 d = path;
 915                 while ((c = *s++)) {
 916                         c = tolower(c);
 917                         *d++ = (c == '_') ? '/' : c;
 918                 }
 919                 strcpy(d, ".h");
 920
 921                 /* Assume directory path already exists. */
 922                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 923                 if (fd == -1) {
 924                         if (errno != ENOENT) {
 925                                 res = 1;
 926                                 break;
 927                         }
 928                         /*
 929                          * Create directory components,
 930                          * unless they exist already.
 931                          */
 932                         d = path;
 933                         while ((d = strchr(d, '/'))) {
 934                                 *d = 0;
 935                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 936                                         res = 1;
 937                                         goto out;
 938                                 }
 939                                 *d++ = '/';
 940                         }
 941                         /* Try it again. */
 942                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 943                         if (fd == -1) {
 944                                 res = 1;
 945                                 break;
 946                         }
 947                 }
 948                 close(fd);
 949         }
 950 out:
 951         if (chdir("../.."))
 952                 return 1;
 953
 954         return res;
 955 }
 956
 957 int conf_write_autoconf(void)
 958 {
 959         struct symbol *sym;
 960         const char *name;
 961         FILE *out, *tristate, *out_h;
 962         int i;
 963
 964         sym_clear_all_valid();
 965
 966         file_write_dep("include/config/auto.conf.cmd");
 967
 968         if (conf_split_config())
 969                 return 1;
 970
 971         out = fopen(".tmpconfig", "w");
 972         if (!out)
 973                 return 1;
 974
 975         tristate = fopen(".tmpconfig_tristate", "w");
 976         if (!tristate) {
 977                 fclose(out);
 978                 return 1;
 979         }
 980
 981         out_h = fopen(".tmpconfig.h", "w");
 982         if (!out_h) {
 983                 fclose(out);
 984                 fclose(tristate);
 985                 return 1;
 986         }
 987
 988         conf_write_heading(out, &kconfig_printer_cb, NULL);
 989
 990         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 991
 992         conf_write_heading(out_h, &header_printer_cb, NULL);
 993
 994         for_all_symbols(i, sym) {
 995                 sym_calc_value(sym);
 996                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 997                         continue;
 998
 999                 /* write symbol to auto.conf, tristate and header files */
1000                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1001
1002                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1003
1004                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1005         }
1006         fclose(out);
1007         fclose(tristate);
1008         fclose(out_h);
1009
1010         name = getenv("KCONFIG_AUTOHEADER");
1011         if (!name)
1012                 name = "include/generated/autoconf.h";
1013         if (rename(".tmpconfig.h", name))
1014                 return 1;
1015         name = getenv("KCONFIG_TRISTATE");
1016         if (!name)
1017                 name = "include/config/tristate.conf";
1018         if (rename(".tmpconfig_tristate", name))
1019                 return 1;
1020         name = conf_get_autoconfig_name();
1021         /*
1022          * This must be the last step, kbuild has a dependency on auto.conf
1023          * and this marks the successful completion of the previous steps.
1024          */
1025         if (rename(".tmpconfig", name))
1026                 return 1;
1027
1028         return 0;
1029 }
1030
1031 static int sym_change_count;
1032 static void (*conf_changed_callback)(void);
1033
1034 void sym_set_change_count(int count)
1035 {
1036         int _sym_change_count = sym_change_count;
1037         sym_change_count = count;
1038         if (conf_changed_callback &&
1039             (bool)_sym_change_count != (bool)count)
1040                 conf_changed_callback();
1041 }
1042
1043 void sym_add_change_count(int count)
1044 {
1045         sym_set_change_count(count + sym_change_count);
1046 }
1047
1048 bool conf_get_changed(void)
1049 {
1050         return sym_change_count;
1051 }
1052
1053 void conf_set_changed_callback(void (*fn)(void))
1054 {
1055         conf_changed_callback = fn;
1056 }
1057
1058 static bool randomize_choice_values(struct symbol *csym)
1059 {
1060         struct property *prop;
1061         struct symbol *sym;
1062         struct expr *e;
1063         int cnt, def;
1064
1065         /*
1066          * If choice is mod then we may have more items selected
1067          * and if no then no-one.
1068          * In both cases stop.
1069          */
1070         if (csym->curr.tri != yes)
1071                 return false;
1072
1073         prop = sym_get_choice_prop(csym);
1074
1075         /* count entries in choice block */
1076         cnt = 0;
1077         expr_list_for_each_sym(prop->expr, e, sym)
1078                 cnt++;
1079
1080         /*
1081          * find a random value and set it to yes,
1082          * set the rest to no so we have only one set
1083          */
1084         def = (rand() % cnt);
1085
1086         cnt = 0;
1087         expr_list_for_each_sym(prop->expr, e, sym) {
1088                 if (def == cnt++) {
1089                         sym->def[S_DEF_USER].tri = yes;
1090                         csym->def[S_DEF_USER].val = sym;
1091                 }
1092                 else {
1093                         sym->def[S_DEF_USER].tri = no;
1094                 }
1095                 sym->flags |= SYMBOL_DEF_USER;
1096                 /* clear VALID to get value calculated */
1097                 sym->flags &= ~SYMBOL_VALID;
1098         }
1099         csym->flags |= SYMBOL_DEF_USER;
1100         /* clear VALID to get value calculated */
1101         csym->flags &= ~(SYMBOL_VALID);
1102
1103         return true;
1104 }
1105
1106 void set_all_choice_values(struct symbol *csym)
1107 {
1108         struct property *prop;
1109         struct symbol *sym;
1110         struct expr *e;
1111
1112         prop = sym_get_choice_prop(csym);
1113
1114         /*
1115          * Set all non-assinged choice values to no
1116          */
1117         expr_list_for_each_sym(prop->expr, e, sym) {
1118                 if (!sym_has_value(sym))
1119                         sym->def[S_DEF_USER].tri = no;
1120         }
1121         csym->flags |= SYMBOL_DEF_USER;
1122         /* clear VALID to get value calculated */
1123         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1124 }
1125
1126 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1127 {
1128         struct symbol *sym, *csym;
1129         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1130                                          * pty: probability of tristate = y
1131                                          * ptm: probability of tristate = m
1132                                          */
1133
1134         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1135                                    * below, otherwise gcc whines about
1136                                    * -Wmaybe-uninitialized */
1137         if (mode == def_random) {
1138                 int n, p[3];
1139                 char *env = getenv("KCONFIG_PROBABILITY");
1140                 n = 0;
1141                 while( env && *env ) {
1142                         char *endp;
1143                         int tmp = strtol( env, &endp, 10 );
1144                         if( tmp >= 0 && tmp <= 100 ) {
1145                                 p[n++] = tmp;
1146                         } else {
1147                                 errno = ERANGE;
1148                                 perror( "KCONFIG_PROBABILITY" );
1149                                 exit( 1 );
1150                         }
1151                         env = (*endp == ':') ? endp+1 : endp;
1152                         if( n >=3 ) {
1153                                 break;
1154                         }
1155                 }
1156                 switch( n ) {
1157                 case 1:
1158                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1159                         break;
1160                 case 2:
1161                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1162                         break;
1163                 case 3:
1164                         pby = p[0]; pty = p[1]; ptm = p[2];
1165                         break;
1166                 }
1167
1168                 if( pty+ptm > 100 ) {
1169                         errno = ERANGE;
1170                         perror( "KCONFIG_PROBABILITY" );
1171                         exit( 1 );
1172                 }
1173         }
1174         bool has_changed = false;
1175
1176         sym_clear_all_valid();
1177
1178         for_all_symbols(i, sym) {
1179                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1180                         continue;
1181                 switch (sym_get_type(sym)) {
1182                 case S_BOOLEAN:
1183                 case S_TRISTATE:
1184                         has_changed = true;
1185                         switch (mode) {
1186                         case def_yes:
1187                                 sym->def[S_DEF_USER].tri = yes;
1188                                 break;
1189                         case def_mod:
1190                                 sym->def[S_DEF_USER].tri = mod;
1191                                 break;
1192                         case def_no:
1193                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1194                                         sym->def[S_DEF_USER].tri = yes;
1195                                 else
1196                                         sym->def[S_DEF_USER].tri = no;
1197                                 break;
1198                         case def_random:
1199                                 sym->def[S_DEF_USER].tri = no;
1200                                 cnt = rand() % 100;
1201                                 if (sym->type == S_TRISTATE) {
1202                                         if (cnt < pty)
1203                                                 sym->def[S_DEF_USER].tri = yes;
1204                                         else if (cnt < (pty+ptm))
1205                                                 sym->def[S_DEF_USER].tri = mod;
1206                                 } else if (cnt < pby)
1207                                         sym->def[S_DEF_USER].tri = yes;
1208                                 break;
1209                         default:
1210                                 continue;
1211                         }
1212                         if (!(sym_is_choice(sym) && mode == def_random))
1213                                 sym->flags |= SYMBOL_DEF_USER;
1214                         break;
1215                 default:
1216                         break;
1217                 }
1218
1219         }
1220
1221         /*
1222          * We have different type of choice blocks.
1223          * If curr.tri equals to mod then we can select several
1224          * choice symbols in one block.
1225          * In this case we do nothing.
1226          * If curr.tri equals yes then only one symbol can be
1227          * selected in a choice block and we set it to yes,
1228          * and the rest to no.
1229          */
1230         if (mode != def_random) {
1231                 for_all_symbols(i, csym) {
1232                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1233                             sym_is_choice_value(csym))
1234                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1235                 }
1236         }
1237
1238         for_all_symbols(i, csym) {
1239                 if (sym_has_value(csym) || !sym_is_choice(csym))
1240                         continue;
1241
1242                 sym_calc_value(csym);
1243                 if (mode == def_random)
1244                         has_changed = randomize_choice_values(csym);
1245                 else {
1246                         set_all_choice_values(csym);
1247                         has_changed = true;
1248                 }
1249         }
1250
1251         return has_changed;
1252 }