scripts/kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <[email protected]>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 struct conf_printer {
  20         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
  21         void (*print_comment)(FILE *, const char *, void *);
  22 };
  23
  24 static void conf_warning(const char *fmt, ...)
  25         __attribute__ ((format (printf, 1, 2)));
  26
  27 static void conf_message(const char *fmt, ...)
  28         __attribute__ ((format (printf, 1, 2)));
  29
  30 static const char *conf_filename;
  31 static int conf_lineno, conf_warnings, conf_unsaved;
  32
  33 const char conf_defname[] = "arch/$ARCH/defconfig";
  34
  35 static void conf_warning(const char *fmt, ...)
  36 {
  37         va_list ap;
  38         va_start(ap, fmt);
  39         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  40         vfprintf(stderr, fmt, ap);
  41         fprintf(stderr, "\n");
  42         va_end(ap);
  43         conf_warnings++;
  44 }
  45
  46 static void conf_default_message_callback(const char *fmt, va_list ap)
  47 {
  48         printf("#\n# ");
  49         vprintf(fmt, ap);
  50         printf("\n#\n");
  51 }
  52
  53 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  54         conf_default_message_callback;
  55 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  56 {
  57         conf_message_callback = fn;
  58 }
  59
  60 static void conf_message(const char *fmt, ...)
  61 {
  62         va_list ap;
  63
  64         va_start(ap, fmt);
  65         if (conf_message_callback)
  66                 conf_message_callback(fmt, ap);
  67         va_end(ap);
  68 }
  69
  70 const char *conf_get_configname(void)
  71 {
  72         char *name = getenv("KCONFIG_CONFIG");
  73
  74         return name ? name : ".config";
  75 }
  76
  77 const char *conf_get_autoconfig_name(void)
  78 {
  79         char *name = getenv("KCONFIG_AUTOCONFIG");
  80
  81         return name ? name : "include/config/auto.conf";
  82 }
  83
  84 static char *conf_expand_value(const char *in)
  85 {
  86         struct symbol *sym;
  87         const char *src;
  88         static char res_value[SYMBOL_MAXLENGTH];
  89         char *dst, name[SYMBOL_MAXLENGTH];
  90
  91         res_value[0] = 0;
  92         dst = name;
  93         while ((src = strchr(in, '$'))) {
  94                 strncat(res_value, in, src - in);
  95                 src++;
  96                 dst = name;
  97                 while (isalnum(*src) || *src == '_')
  98                         *dst++ = *src++;
  99                 *dst = 0;
 100                 sym = sym_lookup(name, 0);
 101                 sym_calc_value(sym);
 102                 strcat(res_value, sym_get_string_value(sym));
 103                 in = src;
 104         }
 105         strcat(res_value, in);
 106
 107         return res_value;
 108 }
 109
 110 char *conf_get_default_confname(void)
 111 {
 112         struct stat buf;
 113         static char fullname[PATH_MAX+1];
 114         char *env, *name;
 115
 116         name = conf_expand_value(conf_defname);
 117         env = getenv(SRCTREE);
 118         if (env) {
 119                 sprintf(fullname, "%s/%s", env, name);
 120                 if (!stat(fullname, &buf))
 121                         return fullname;
 122         }
 123         return name;
 124 }
 125
 126 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 127 {
 128         char *p2;
 129
 130         switch (sym->type) {
 131         case S_TRISTATE:
 132                 if (p[0] == 'm') {
 133                         sym->def[def].tri = mod;
 134                         sym->flags |= def_flags;
 135                         break;
 136                 }
 137                 /* fall through */
 138         case S_BOOLEAN:
 139                 if (p[0] == 'y') {
 140                         sym->def[def].tri = yes;
 141                         sym->flags |= def_flags;
 142                         break;
 143                 }
 144                 if (p[0] == 'n') {
 145                         sym->def[def].tri = no;
 146                         sym->flags |= def_flags;
 147                         break;
 148                 }
 149                 if (def != S_DEF_AUTO)
 150                         conf_warning("symbol value '%s' invalid for %s",
 151                                      p, sym->name);
 152                 return 1;
 153         case S_OTHER:
 154                 if (*p != '"') {
 155                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 156                                 ;
 157                         sym->type = S_STRING;
 158                         goto done;
 159                 }
 160                 /* fall through */
 161         case S_STRING:
 162                 if (*p++ != '"')
 163                         break;
 164                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 165                         if (*p2 == '"') {
 166                                 *p2 = 0;
 167                                 break;
 168                         }
 169                         memmove(p2, p2 + 1, strlen(p2));
 170                 }
 171                 if (!p2) {
 172                         if (def != S_DEF_AUTO)
 173                                 conf_warning("invalid string found");
 174                         return 1;
 175                 }
 176                 /* fall through */
 177         case S_INT:
 178         case S_HEX:
 179         done:
 180                 if (sym_string_valid(sym, p)) {
 181                         sym->def[def].val = strdup(p);
 182                         sym->flags |= def_flags;
 183                 } else {
 184                         if (def != S_DEF_AUTO)
 185                                 conf_warning("symbol value '%s' invalid for %s",
 186                                              p, sym->name);
 187                         return 1;
 188                 }
 189                 break;
 190         default:
 191                 ;
 192         }
 193         return 0;
 194 }
 195
 196 #define LINE_GROWTH 16
 197 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 198 {
 199         char *nline;
 200         size_t new_size = slen + 1;
 201         if (new_size > *n) {
 202                 new_size += LINE_GROWTH - 1;
 203                 new_size *= 2;
 204                 nline = realloc(*lineptr, new_size);
 205                 if (!nline)
 206                         return -1;
 207
 208                 *lineptr = nline;
 209                 *n = new_size;
 210         }
 211
 212         (*lineptr)[slen] = c;
 213
 214         return 0;
 215 }
 216
 217 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 218 {
 219         char *line = *lineptr;
 220         size_t slen = 0;
 221
 222         for (;;) {
 223                 int c = getc(stream);
 224
 225                 switch (c) {
 226                 case '\n':
 227                         if (add_byte(c, &line, slen, n) < 0)
 228                                 goto e_out;
 229                         slen++;
 230                         /* fall through */
 231                 case EOF:
 232                         if (add_byte('\0', &line, slen, n) < 0)
 233                                 goto e_out;
 234                         *lineptr = line;
 235                         if (slen == 0)
 236                                 return -1;
 237                         return slen;
 238                 default:
 239                         if (add_byte(c, &line, slen, n) < 0)
 240                                 goto e_out;
 241                         slen++;
 242                 }
 243         }
 244
 245 e_out:
 246         line[slen-1] = '\0';
 247         *lineptr = line;
 248         return -1;
 249 }
 250
 251 int conf_read_simple(const char *name, int def)
 252 {
 253         FILE *in = NULL;
 254         char   *line = NULL;
 255         size_t  line_asize = 0;
 256         char *p, *p2;
 257         struct symbol *sym;
 258         int i, def_flags;
 259
 260         if (name) {
 261                 in = zconf_fopen(name);
 262         } else {
 263                 struct property *prop;
 264
 265                 name = conf_get_configname();
 266                 in = zconf_fopen(name);
 267                 if (in)
 268                         goto load;
 269                 sym_add_change_count(1);
 270                 if (!sym_defconfig_list) {
 271                         sym_calc_value(modules_sym);
 272                         return 1;
 273                 }
 274
 275                 for_all_defaults(sym_defconfig_list, prop) {
 276                         if (expr_calc_value(prop->visible.expr) == no ||
 277                             prop->expr->type != E_SYMBOL)
 278                                 continue;
 279                         name = conf_expand_value(prop->expr->left.sym->name);
 280                         in = zconf_fopen(name);
 281                         if (in) {
 282                                 conf_message(_("using defaults found in %s"),
 283                                          name);
 284                                 goto load;
 285                         }
 286                 }
 287         }
 288         if (!in)
 289                 return 1;
 290
 291 load:
 292         conf_filename = name;
 293         conf_lineno = 0;
 294         conf_warnings = 0;
 295         conf_unsaved = 0;
 296
 297         def_flags = SYMBOL_DEF << def;
 298         for_all_symbols(i, sym) {
 299                 sym->flags |= SYMBOL_CHANGED;
 300                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 301                 if (sym_is_choice(sym))
 302                         sym->flags |= def_flags;
 303                 switch (sym->type) {
 304                 case S_INT:
 305                 case S_HEX:
 306                 case S_STRING:
 307                         if (sym->def[def].val)
 308                                 free(sym->def[def].val);
 309                         /* fall through */
 310                 default:
 311                         sym->def[def].val = NULL;
 312                         sym->def[def].tri = no;
 313                 }
 314         }
 315
 316         while (compat_getline(&line, &line_asize, in) != -1) {
 317                 conf_lineno++;
 318                 sym = NULL;
 319                 if (line[0] == '#') {
 320                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 321                                 continue;
 322                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 323                         if (!p)
 324                                 continue;
 325                         *p++ = 0;
 326                         if (strncmp(p, "is not set", 10))
 327                                 continue;
 328                         if (def == S_DEF_USER) {
 329                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 330                                 if (!sym) {
 331                                         sym_add_change_count(1);
 332                                         goto setsym;
 333                                 }
 334                         } else {
 335                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 336                                 if (sym->type == S_UNKNOWN)
 337                                         sym->type = S_BOOLEAN;
 338                         }
 339                         if (sym->flags & def_flags) {
 340                                 conf_warning("override: reassigning to symbol %s", sym->name);
 341                         }
 342                         switch (sym->type) {
 343                         case S_BOOLEAN:
 344                         case S_TRISTATE:
 345                                 sym->def[def].tri = no;
 346                                 sym->flags |= def_flags;
 347                                 break;
 348                         default:
 349                                 ;
 350                         }
 351                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 352                         p = strchr(line + strlen(CONFIG_), '=');
 353                         if (!p)
 354                                 continue;
 355                         *p++ = 0;
 356                         p2 = strchr(p, '\n');
 357                         if (p2) {
 358                                 *p2-- = 0;
 359                                 if (*p2 == '\r')
 360                                         *p2 = 0;
 361                         }
 362                         if (def == S_DEF_USER) {
 363                                 sym = sym_find(line + strlen(CONFIG_));
 364                                 if (!sym) {
 365                                         sym_add_change_count(1);
 366                                         goto setsym;
 367                                 }
 368                         } else {
 369                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 370                                 if (sym->type == S_UNKNOWN)
 371                                         sym->type = S_OTHER;
 372                         }
 373                         if (sym->flags & def_flags) {
 374                                 conf_warning("override: reassigning to symbol %s", sym->name);
 375                         }
 376                         if (conf_set_sym_val(sym, def, def_flags, p))
 377                                 continue;
 378                 } else {
 379                         if (line[0] != '\r' && line[0] != '\n')
 380                                 conf_warning("unexpected data");
 381                         continue;
 382                 }
 383 setsym:
 384                 if (sym && sym_is_choice_value(sym)) {
 385                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 386                         switch (sym->def[def].tri) {
 387                         case no:
 388                                 break;
 389                         case mod:
 390                                 if (cs->def[def].tri == yes) {
 391                                         conf_warning("%s creates inconsistent choice state", sym->name);
 392                                         cs->flags &= ~def_flags;
 393                                 }
 394                                 break;
 395                         case yes:
 396                                 if (cs->def[def].tri != no)
 397                                         conf_warning("override: %s changes choice state", sym->name);
 398                                 cs->def[def].val = sym;
 399                                 break;
 400                         }
 401                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 402                 }
 403         }
 404         free(line);
 405         fclose(in);
 406         sym_calc_value(modules_sym);
 407         return 0;
 408 }
 409
 410 int conf_read(const char *name)
 411 {
 412         struct symbol *sym;
 413         int i;
 414
 415         sym_set_change_count(0);
 416
 417         if (conf_read_simple(name, S_DEF_USER))
 418                 return 1;
 419
 420         for_all_symbols(i, sym) {
 421                 sym_calc_value(sym);
 422                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 423                         continue;
 424                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 425                         /* check that calculated value agrees with saved value */
 426                         switch (sym->type) {
 427                         case S_BOOLEAN:
 428                         case S_TRISTATE:
 429                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 430                                         break;
 431                                 if (!sym_is_choice(sym))
 432                                         continue;
 433                                 /* fall through */
 434                         default:
 435                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 436                                         continue;
 437                                 break;
 438                         }
 439                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 440                         /* no previous value and not saved */
 441                         continue;
 442                 conf_unsaved++;
 443                 /* maybe print value in verbose mode... */
 444         }
 445
 446         for_all_symbols(i, sym) {
 447                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 448                         /* Reset values of generates values, so they'll appear
 449                          * as new, if they should become visible, but that
 450                          * doesn't quite work if the Kconfig and the saved
 451                          * configuration disagree.
 452                          */
 453                         if (sym->visible == no && !conf_unsaved)
 454                                 sym->flags &= ~SYMBOL_DEF_USER;
 455                         switch (sym->type) {
 456                         case S_STRING:
 457                         case S_INT:
 458                         case S_HEX:
 459                                 /* Reset a string value if it's out of range */
 460                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 461                                         break;
 462                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 463                                 conf_unsaved++;
 464                                 break;
 465                         default:
 466                                 break;
 467                         }
 468                 }
 469         }
 470
 471         sym_add_change_count(conf_warnings || conf_unsaved);
 472
 473         return 0;
 474 }
 475
 476 /*
 477  * Kconfig configuration printer
 478  *
 479  * This printer is used when generating the resulting configuration after
 480  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 481  * passing a non-NULL argument to the printer.
 482  *
 483  */
 484 static void
 485 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 486 {
 487
 488         switch (sym->type) {
 489         case S_BOOLEAN:
 490         case S_TRISTATE:
 491                 if (*value == 'n') {
 492                         bool skip_unset = (arg != NULL);
 493
 494                         if (!skip_unset)
 495                                 fprintf(fp, "# %s%s is not set\n",
 496                                     CONFIG_, sym->name);
 497                         return;
 498                 }
 499                 break;
 500         default:
 501                 break;
 502         }
 503
 504         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 505 }
 506
 507 static void
 508 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 509 {
 510         const char *p = value;
 511         size_t l;
 512
 513         for (;;) {
 514                 l = strcspn(p, "\n");
 515                 fprintf(fp, "#");
 516                 if (l) {
 517                         fprintf(fp, " ");
 518                         xfwrite(p, l, 1, fp);
 519                         p += l;
 520                 }
 521                 fprintf(fp, "\n");
 522                 if (*p++ == '\0')
 523                         break;
 524         }
 525 }
 526
 527 static struct conf_printer kconfig_printer_cb =
 528 {
 529         .print_symbol = kconfig_print_symbol,
 530         .print_comment = kconfig_print_comment,
 531 };
 532
 533 /*
 534  * Header printer
 535  *
 536  * This printer is used when generating the `include/generated/autoconf.h' file.
 537  */
 538 static void
 539 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 540 {
 541
 542         switch (sym->type) {
 543         case S_BOOLEAN:
 544         case S_TRISTATE: {
 545                 const char *suffix = "";
 546
 547                 switch (*value) {
 548                 case 'n':
 549                         break;
 550                 case 'm':
 551                         suffix = "_MODULE";
 552                         /* fall through */
 553                 default:
 554                         fprintf(fp, "#define %s%s%s 1\n",
 555                             CONFIG_, sym->name, suffix);
 556                 }
 557                 break;
 558         }
 559         case S_HEX: {
 560                 const char *prefix = "";
 561
 562                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 563                         prefix = "0x";
 564                 fprintf(fp, "#define %s%s %s%s\n",
 565                     CONFIG_, sym->name, prefix, value);
 566                 break;
 567         }
 568         case S_STRING:
 569         case S_INT:
 570                 fprintf(fp, "#define %s%s %s\n",
 571                     CONFIG_, sym->name, value);
 572                 break;
 573         default:
 574                 break;
 575         }
 576
 577 }
 578
 579 static void
 580 header_print_comment(FILE *fp, const char *value, void *arg)
 581 {
 582         const char *p = value;
 583         size_t l;
 584
 585         fprintf(fp, "/*\n");
 586         for (;;) {
 587                 l = strcspn(p, "\n");
 588                 fprintf(fp, " *");
 589                 if (l) {
 590                         fprintf(fp, " ");
 591                         xfwrite(p, l, 1, fp);
 592                         p += l;
 593                 }
 594                 fprintf(fp, "\n");
 595                 if (*p++ == '\0')
 596                         break;
 597         }
 598         fprintf(fp, " */\n");
 599 }
 600
 601 static struct conf_printer header_printer_cb =
 602 {
 603         .print_symbol = header_print_symbol,
 604         .print_comment = header_print_comment,
 605 };
 606
 607 /*
 608  * Tristate printer
 609  *
 610  * This printer is used when generating the `include/config/tristate.conf' file.
 611  */
 612 static void
 613 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 614 {
 615
 616         if (sym->type == S_TRISTATE && *value != 'n')
 617                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 618 }
 619
 620 static struct conf_printer tristate_printer_cb =
 621 {
 622         .print_symbol = tristate_print_symbol,
 623         .print_comment = kconfig_print_comment,
 624 };
 625
 626 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 627                               struct conf_printer *printer, void *printer_arg)
 628 {
 629         const char *str;
 630
 631         switch (sym->type) {
 632         case S_OTHER:
 633         case S_UNKNOWN:
 634                 break;
 635         case S_STRING:
 636                 str = sym_get_string_value(sym);
 637                 str = sym_escape_string_value(str);
 638                 printer->print_symbol(fp, sym, str, printer_arg);
 639                 free((void *)str);
 640                 break;
 641         default:
 642                 str = sym_get_string_value(sym);
 643                 printer->print_symbol(fp, sym, str, printer_arg);
 644         }
 645 }
 646
 647 static void
 648 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 649 {
 650         char buf[256];
 651
 652         snprintf(buf, sizeof(buf),
 653             "\n"
 654             "Automatically generated file; DO NOT EDIT.\n"
 655             "%s\n",
 656             rootmenu.prompt->text);
 657
 658         printer->print_comment(fp, buf, printer_arg);
 659 }
 660
 661 /*
 662  * Write out a minimal config.
 663  * All values that has default values are skipped as this is redundant.
 664  */
 665 int conf_write_defconfig(const char *filename)
 666 {
 667         struct symbol *sym;
 668         struct menu *menu;
 669         FILE *out;
 670
 671         out = fopen(filename, "w");
 672         if (!out)
 673                 return 1;
 674
 675         sym_clear_all_valid();
 676
 677         /* Traverse all menus to find all relevant symbols */
 678         menu = rootmenu.list;
 679
 680         while (menu != NULL)
 681         {
 682                 sym = menu->sym;
 683                 if (sym == NULL) {
 684                         if (!menu_is_visible(menu))
 685                                 goto next_menu;
 686                 } else if (!sym_is_choice(sym)) {
 687                         sym_calc_value(sym);
 688                         if (!(sym->flags & SYMBOL_WRITE))
 689                                 goto next_menu;
 690                         sym->flags &= ~SYMBOL_WRITE;
 691                         /* If we cannot change the symbol - skip */
 692                         if (!sym_is_changable(sym))
 693                                 goto next_menu;
 694                         /* If symbol equals to default value - skip */
 695                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 696                                 goto next_menu;
 697
 698                         /*
 699                          * If symbol is a choice value and equals to the
 700                          * default for a choice - skip.
 701                          * But only if value is bool and equal to "y" and
 702                          * choice is not "optional".
 703                          * (If choice is "optional" then all values can be "n")
 704                          */
 705                         if (sym_is_choice_value(sym)) {
 706                                 struct symbol *cs;
 707                                 struct symbol *ds;
 708
 709                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 710                                 ds = sym_choice_default(cs);
 711                                 if (!sym_is_optional(cs) && sym == ds) {
 712                                         if ((sym->type == S_BOOLEAN) &&
 713                                             sym_get_tristate_value(sym) == yes)
 714                                                 goto next_menu;
 715                                 }
 716                         }
 717                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 718                 }
 719 next_menu:
 720                 if (menu->list != NULL) {
 721                         menu = menu->list;
 722                 }
 723                 else if (menu->next != NULL) {
 724                         menu = menu->next;
 725                 } else {
 726                         while ((menu = menu->parent)) {
 727                                 if (menu->next != NULL) {
 728                                         menu = menu->next;
 729                                         break;
 730                                 }
 731                         }
 732                 }
 733         }
 734         fclose(out);
 735         return 0;
 736 }
 737
 738 int conf_write(const char *name)
 739 {
 740         FILE *out;
 741         struct symbol *sym;
 742         struct menu *menu;
 743         const char *basename;
 744         const char *str;
 745         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 746         char *env;
 747
 748         dirname[0] = 0;
 749         if (name && name[0]) {
 750                 struct stat st;
 751                 char *slash;
 752
 753                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 754                         strcpy(dirname, name);
 755                         strcat(dirname, "/");
 756                         basename = conf_get_configname();
 757                 } else if ((slash = strrchr(name, '/'))) {
 758                         int size = slash - name + 1;
 759                         memcpy(dirname, name, size);
 760                         dirname[size] = 0;
 761                         if (slash[1])
 762                                 basename = slash + 1;
 763                         else
 764                                 basename = conf_get_configname();
 765                 } else
 766                         basename = name;
 767         } else
 768                 basename = conf_get_configname();
 769
 770         sprintf(newname, "%s%s", dirname, basename);
 771         env = getenv("KCONFIG_OVERWRITECONFIG");
 772         if (!env || !*env) {
 773                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 774                 out = fopen(tmpname, "w");
 775         } else {
 776                 *tmpname = 0;
 777                 out = fopen(newname, "w");
 778         }
 779         if (!out)
 780                 return 1;
 781
 782         conf_write_heading(out, &kconfig_printer_cb, NULL);
 783
 784         if (!conf_get_changed())
 785                 sym_clear_all_valid();
 786
 787         menu = rootmenu.list;
 788         while (menu) {
 789                 sym = menu->sym;
 790                 if (!sym) {
 791                         if (!menu_is_visible(menu))
 792                                 goto next;
 793                         str = menu_get_prompt(menu);
 794                         fprintf(out, "\n"
 795                                      "#\n"
 796                                      "# %s\n"
 797                                      "#\n", str);
 798                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 799                         sym_calc_value(sym);
 800                         if (!(sym->flags & SYMBOL_WRITE))
 801                                 goto next;
 802                         sym->flags &= ~SYMBOL_WRITE;
 803
 804                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 805                 }
 806
 807 next:
 808                 if (menu->list) {
 809                         menu = menu->list;
 810                         continue;
 811                 }
 812                 if (menu->next)
 813                         menu = menu->next;
 814                 else while ((menu = menu->parent)) {
 815                         if (menu->next) {
 816                                 menu = menu->next;
 817                                 break;
 818                         }
 819                 }
 820         }
 821         fclose(out);
 822
 823         if (*tmpname) {
 824                 strcat(dirname, basename);
 825                 strcat(dirname, ".old");
 826                 rename(newname, dirname);
 827                 if (rename(tmpname, newname))
 828                         return 1;
 829         }
 830
 831         conf_message(_("configuration written to %s"), newname);
 832
 833         sym_set_change_count(0);
 834
 835         return 0;
 836 }
 837
 838 static int conf_split_config(void)
 839 {
 840         const char *name;
 841         char path[PATH_MAX+1];
 842         char *s, *d, c;
 843         struct symbol *sym;
 844         struct stat sb;
 845         int res, i, fd;
 846
 847         name = conf_get_autoconfig_name();
 848         conf_read_simple(name, S_DEF_AUTO);
 849
 850         if (chdir("include/config"))
 851                 return 1;
 852
 853         res = 0;
 854         for_all_symbols(i, sym) {
 855                 sym_calc_value(sym);
 856                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 857                         continue;
 858                 if (sym->flags & SYMBOL_WRITE) {
 859                         if (sym->flags & SYMBOL_DEF_AUTO) {
 860                                 /*
 861                                  * symbol has old and new value,
 862                                  * so compare them...
 863                                  */
 864                                 switch (sym->type) {
 865                                 case S_BOOLEAN:
 866                                 case S_TRISTATE:
 867                                         if (sym_get_tristate_value(sym) ==
 868                                             sym->def[S_DEF_AUTO].tri)
 869                                                 continue;
 870                                         break;
 871                                 case S_STRING:
 872                                 case S_HEX:
 873                                 case S_INT:
 874                                         if (!strcmp(sym_get_string_value(sym),
 875                                                     sym->def[S_DEF_AUTO].val))
 876                                                 continue;
 877                                         break;
 878                                 default:
 879                                         break;
 880                                 }
 881                         } else {
 882                                 /*
 883                                  * If there is no old value, only 'no' (unset)
 884                                  * is allowed as new value.
 885                                  */
 886                                 switch (sym->type) {
 887                                 case S_BOOLEAN:
 888                                 case S_TRISTATE:
 889                                         if (sym_get_tristate_value(sym) == no)
 890                                                 continue;
 891                                         break;
 892                                 default:
 893                                         break;
 894                                 }
 895                         }
 896                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 897                         /* There is neither an old nor a new value. */
 898                         continue;
 899                 /* else
 900                  *      There is an old value, but no new value ('no' (unset)
 901                  *      isn't saved in auto.conf, so the old value is always
 902                  *      different from 'no').
 903                  */
 904
 905                 /* Replace all '_' and append ".h" */
 906                 s = sym->name;
 907                 d = path;
 908                 while ((c = *s++)) {
 909                         c = tolower(c);
 910                         *d++ = (c == '_') ? '/' : c;
 911                 }
 912                 strcpy(d, ".h");
 913
 914                 /* Assume directory path already exists. */
 915                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 916                 if (fd == -1) {
 917                         if (errno != ENOENT) {
 918                                 res = 1;
 919                                 break;
 920                         }
 921                         /*
 922                          * Create directory components,
 923                          * unless they exist already.
 924                          */
 925                         d = path;
 926                         while ((d = strchr(d, '/'))) {
 927                                 *d = 0;
 928                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 929                                         res = 1;
 930                                         goto out;
 931                                 }
 932                                 *d++ = '/';
 933                         }
 934                         /* Try it again. */
 935                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 936                         if (fd == -1) {
 937                                 res = 1;
 938                                 break;
 939                         }
 940                 }
 941                 close(fd);
 942         }
 943 out:
 944         if (chdir("../.."))
 945                 return 1;
 946
 947         return res;
 948 }
 949
 950 int conf_write_autoconf(void)
 951 {
 952         struct symbol *sym;
 953         const char *name;
 954         FILE *out, *tristate, *out_h;
 955         int i;
 956
 957         sym_clear_all_valid();
 958
 959         file_write_dep("include/config/auto.conf.cmd");
 960
 961         if (conf_split_config())
 962                 return 1;
 963
 964         out = fopen(".tmpconfig", "w");
 965         if (!out)
 966                 return 1;
 967
 968         tristate = fopen(".tmpconfig_tristate", "w");
 969         if (!tristate) {
 970                 fclose(out);
 971                 return 1;
 972         }
 973
 974         out_h = fopen(".tmpconfig.h", "w");
 975         if (!out_h) {
 976                 fclose(out);
 977                 fclose(tristate);
 978                 return 1;
 979         }
 980
 981         conf_write_heading(out, &kconfig_printer_cb, NULL);
 982
 983         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 984
 985         conf_write_heading(out_h, &header_printer_cb, NULL);
 986
 987         for_all_symbols(i, sym) {
 988                 sym_calc_value(sym);
 989                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 990                         continue;
 991
 992                 /* write symbol to auto.conf, tristate and header files */
 993                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 994
 995                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 996
 997                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 998         }
 999         fclose(out);
1000         fclose(tristate);
1001         fclose(out_h);
1002
1003         name = getenv("KCONFIG_AUTOHEADER");
1004         if (!name)
1005                 name = "include/generated/autoconf.h";
1006         if (rename(".tmpconfig.h", name))
1007                 return 1;
1008         name = getenv("KCONFIG_TRISTATE");
1009         if (!name)
1010                 name = "include/config/tristate.conf";
1011         if (rename(".tmpconfig_tristate", name))
1012                 return 1;
1013         name = conf_get_autoconfig_name();
1014         /*
1015          * This must be the last step, kbuild has a dependency on auto.conf
1016          * and this marks the successful completion of the previous steps.
1017          */
1018         if (rename(".tmpconfig", name))
1019                 return 1;
1020
1021         return 0;
1022 }
1023
1024 static int sym_change_count;
1025 static void (*conf_changed_callback)(void);
1026
1027 void sym_set_change_count(int count)
1028 {
1029         int _sym_change_count = sym_change_count;
1030         sym_change_count = count;
1031         if (conf_changed_callback &&
1032             (bool)_sym_change_count != (bool)count)
1033                 conf_changed_callback();
1034 }
1035
1036 void sym_add_change_count(int count)
1037 {
1038         sym_set_change_count(count + sym_change_count);
1039 }
1040
1041 bool conf_get_changed(void)
1042 {
1043         return sym_change_count;
1044 }
1045
1046 void conf_set_changed_callback(void (*fn)(void))
1047 {
1048         conf_changed_callback = fn;
1049 }
1050
1051 static bool randomize_choice_values(struct symbol *csym)
1052 {
1053         struct property *prop;
1054         struct symbol *sym;
1055         struct expr *e;
1056         int cnt, def;
1057
1058         /*
1059          * If choice is mod then we may have more items selected
1060          * and if no then no-one.
1061          * In both cases stop.
1062          */
1063         if (csym->curr.tri != yes)
1064                 return false;
1065
1066         prop = sym_get_choice_prop(csym);
1067
1068         /* count entries in choice block */
1069         cnt = 0;
1070         expr_list_for_each_sym(prop->expr, e, sym)
1071                 cnt++;
1072
1073         /*
1074          * find a random value and set it to yes,
1075          * set the rest to no so we have only one set
1076          */
1077         def = (rand() % cnt);
1078
1079         cnt = 0;
1080         expr_list_for_each_sym(prop->expr, e, sym) {
1081                 if (def == cnt++) {
1082                         sym->def[S_DEF_USER].tri = yes;
1083                         csym->def[S_DEF_USER].val = sym;
1084                 }
1085                 else {
1086                         sym->def[S_DEF_USER].tri = no;
1087                 }
1088                 sym->flags |= SYMBOL_DEF_USER;
1089                 /* clear VALID to get value calculated */
1090                 sym->flags &= ~SYMBOL_VALID;
1091         }
1092         csym->flags |= SYMBOL_DEF_USER;
1093         /* clear VALID to get value calculated */
1094         csym->flags &= ~(SYMBOL_VALID);
1095
1096         return true;
1097 }
1098
1099 void set_all_choice_values(struct symbol *csym)
1100 {
1101         struct property *prop;
1102         struct symbol *sym;
1103         struct expr *e;
1104
1105         prop = sym_get_choice_prop(csym);
1106
1107         /*
1108          * Set all non-assinged choice values to no
1109          */
1110         expr_list_for_each_sym(prop->expr, e, sym) {
1111                 if (!sym_has_value(sym))
1112                         sym->def[S_DEF_USER].tri = no;
1113         }
1114         csym->flags |= SYMBOL_DEF_USER;
1115         /* clear VALID to get value calculated */
1116         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1117 }
1118
1119 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1120 {
1121         struct symbol *sym, *csym;
1122         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1123                                          * pty: probability of tristate = y
1124                                          * ptm: probability of tristate = m
1125                                          */
1126
1127         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1128                                    * below, otherwise gcc whines about
1129                                    * -Wmaybe-uninitialized */
1130         if (mode == def_random) {
1131                 int n, p[3];
1132                 char *env = getenv("KCONFIG_PROBABILITY");
1133                 n = 0;
1134                 while( env && *env ) {
1135                         char *endp;
1136                         int tmp = strtol( env, &endp, 10 );
1137                         if( tmp >= 0 && tmp <= 100 ) {
1138                                 p[n++] = tmp;
1139                         } else {
1140                                 errno = ERANGE;
1141                                 perror( "KCONFIG_PROBABILITY" );
1142                                 exit( 1 );
1143                         }
1144                         env = (*endp == ':') ? endp+1 : endp;
1145                         if( n >=3 ) {
1146                                 break;
1147                         }
1148                 }
1149                 switch( n ) {
1150                 case 1:
1151                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1152                         break;
1153                 case 2:
1154                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1155                         break;
1156                 case 3:
1157                         pby = p[0]; pty = p[1]; ptm = p[2];
1158                         break;
1159                 }
1160
1161                 if( pty+ptm > 100 ) {
1162                         errno = ERANGE;
1163                         perror( "KCONFIG_PROBABILITY" );
1164                         exit( 1 );
1165                 }
1166         }
1167         bool has_changed = false;
1168
1169         for_all_symbols(i, sym) {
1170                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1171                         continue;
1172                 switch (sym_get_type(sym)) {
1173                 case S_BOOLEAN:
1174                 case S_TRISTATE:
1175                         has_changed = true;
1176                         switch (mode) {
1177                         case def_yes:
1178                                 sym->def[S_DEF_USER].tri = yes;
1179                                 break;
1180                         case def_mod:
1181                                 sym->def[S_DEF_USER].tri = mod;
1182                                 break;
1183                         case def_no:
1184                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1185                                         sym->def[S_DEF_USER].tri = yes;
1186                                 else
1187                                         sym->def[S_DEF_USER].tri = no;
1188                                 break;
1189                         case def_random:
1190                                 sym->def[S_DEF_USER].tri = no;
1191                                 cnt = rand() % 100;
1192                                 if (sym->type == S_TRISTATE) {
1193                                         if (cnt < pty)
1194                                                 sym->def[S_DEF_USER].tri = yes;
1195                                         else if (cnt < (pty+ptm))
1196                                                 sym->def[S_DEF_USER].tri = mod;
1197                                 } else if (cnt < pby)
1198                                         sym->def[S_DEF_USER].tri = yes;
1199                                 break;
1200                         default:
1201                                 continue;
1202                         }
1203                         if (!(sym_is_choice(sym) && mode == def_random))
1204                                 sym->flags |= SYMBOL_DEF_USER;
1205                         break;
1206                 default:
1207                         break;
1208                 }
1209
1210         }
1211
1212         sym_clear_all_valid();
1213
1214         /*
1215          * We have different type of choice blocks.
1216          * If curr.tri equals to mod then we can select several
1217          * choice symbols in one block.
1218          * In this case we do nothing.
1219          * If curr.tri equals yes then only one symbol can be
1220          * selected in a choice block and we set it to yes,
1221          * and the rest to no.
1222          */
1223         if (mode != def_random) {
1224                 for_all_symbols(i, csym) {
1225                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1226                             sym_is_choice_value(csym))
1227                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1228                 }
1229         }
1230
1231         for_all_symbols(i, csym) {
1232                 if (sym_has_value(csym) || !sym_is_choice(csym))
1233                         continue;
1234
1235                 sym_calc_value(csym);
1236                 if (mode == def_random)
1237                         has_changed = randomize_choice_values(csym);
1238                 else {
1239                         set_all_choice_values(csym);
1240                         has_changed = true;
1241                 }
1242         }
1243
1244         return has_changed;
1245 }