git.sur5r.net Git - kconfig-frontends/blob - libs/parser/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 static void conf_warning(const char *fmt, ...)
  20         __attribute__ ((format (printf, 1, 2)));
  21
  22 static void conf_message(const char *fmt, ...)
  23         __attribute__ ((format (printf, 1, 2)));
  24
  25 static const char *conf_filename;
  26 static int conf_lineno, conf_warnings, conf_unsaved;
  27
  28 const char conf_defname[] = "arch/$ARCH/defconfig";
  29
  30 static void conf_warning(const char *fmt, ...)
  31 {
  32         va_list ap;
  33         va_start(ap, fmt);
  34         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  35         vfprintf(stderr, fmt, ap);
  36         fprintf(stderr, "\n");
  37         va_end(ap);
  38         conf_warnings++;
  39 }
  40
  41 static void conf_default_message_callback(const char *fmt, va_list ap)
  42 {
  43         printf("#\n# ");
  44         vprintf(fmt, ap);
  45         printf("\n#\n");
  46 }
  47
  48 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  49         conf_default_message_callback;
  50 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  51 {
  52         conf_message_callback = fn;
  53 }
  54
  55 static void conf_message(const char *fmt, ...)
  56 {
  57         va_list ap;
  58
  59         va_start(ap, fmt);
  60         if (conf_message_callback)
  61                 conf_message_callback(fmt, ap);
  62         va_end(ap);
  63 }
  64
  65 const char *conf_get_configname(void)
  66 {
  67         char *name = getenv("KCONFIG_CONFIG");
  68
  69         return name ? name : ".config";
  70 }
  71
  72 const char *conf_get_autoconfig_name(void)
  73 {
  74         char *name = getenv("KCONFIG_AUTOCONFIG");
  75
  76         return name ? name : "include/config/auto.conf";
  77 }
  78
  79 static char *conf_expand_value(const char *in)
  80 {
  81         struct symbol *sym;
  82         const char *src;
  83         static char res_value[SYMBOL_MAXLENGTH];
  84         char *dst, name[SYMBOL_MAXLENGTH];
  85
  86         res_value[0] = 0;
  87         dst = name;
  88         while ((src = strchr(in, '$'))) {
  89                 strncat(res_value, in, src - in);
  90                 src++;
  91                 dst = name;
  92                 while (isalnum(*src) || *src == '_')
  93                         *dst++ = *src++;
  94                 *dst = 0;
  95                 sym = sym_lookup(name, 0);
  96                 sym_calc_value(sym);
  97                 strcat(res_value, sym_get_string_value(sym));
  98                 in = src;
  99         }
 100         strcat(res_value, in);
 101
 102         return res_value;
 103 }
 104
 105 char *conf_get_default_confname(void)
 106 {
 107         struct stat buf;
 108         static char fullname[PATH_MAX+1];
 109         char *env, *name;
 110
 111         name = conf_expand_value(conf_defname);
 112         env = getenv(SRCTREE);
 113         if (env) {
 114                 sprintf(fullname, "%s/%s", env, name);
 115                 if (!stat(fullname, &buf))
 116                         return fullname;
 117         }
 118         return name;
 119 }
 120
 121 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 122 {
 123         char *p2;
 124
 125         switch (sym->type) {
 126         case S_TRISTATE:
 127                 if (p[0] == 'm') {
 128                         sym->def[def].tri = mod;
 129                         sym->flags |= def_flags;
 130                         break;
 131                 }
 132                 /* fall through */
 133         case S_BOOLEAN:
 134                 if (p[0] == 'y') {
 135                         sym->def[def].tri = yes;
 136                         sym->flags |= def_flags;
 137                         break;
 138                 }
 139                 if (p[0] == 'n') {
 140                         sym->def[def].tri = no;
 141                         sym->flags |= def_flags;
 142                         break;
 143                 }
 144                 if (def != S_DEF_AUTO)
 145                         conf_warning("symbol value '%s' invalid for %s",
 146                                      p, sym->name);
 147                 return 1;
 148         case S_OTHER:
 149                 if (*p != '"') {
 150                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 151                                 ;
 152                         sym->type = S_STRING;
 153                         goto done;
 154                 }
 155                 /* fall through */
 156         case S_STRING:
 157                 if (*p++ != '"')
 158                         break;
 159                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 160                         if (*p2 == '"') {
 161                                 *p2 = 0;
 162                                 break;
 163                         }
 164                         memmove(p2, p2 + 1, strlen(p2));
 165                 }
 166                 if (!p2) {
 167                         if (def != S_DEF_AUTO)
 168                                 conf_warning("invalid string found");
 169                         return 1;
 170                 }
 171                 /* fall through */
 172         case S_INT:
 173         case S_HEX:
 174         done:
 175                 if (sym_string_valid(sym, p)) {
 176                         sym->def[def].val = strdup(p);
 177                         sym->flags |= def_flags;
 178                 } else {
 179                         if (def != S_DEF_AUTO)
 180                                 conf_warning("symbol value '%s' invalid for %s",
 181                                              p, sym->name);
 182                         return 1;
 183                 }
 184                 break;
 185         default:
 186                 ;
 187         }
 188         return 0;
 189 }
 190
 191 #define LINE_GROWTH 16
 192 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 193 {
 194         char *nline;
 195         size_t new_size = slen + 1;
 196         if (new_size > *n) {
 197                 new_size += LINE_GROWTH - 1;
 198                 new_size *= 2;
 199                 nline = realloc(*lineptr, new_size);
 200                 if (!nline)
 201                         return -1;
 202
 203                 *lineptr = nline;
 204                 *n = new_size;
 205         }
 206
 207         (*lineptr)[slen] = c;
 208
 209         return 0;
 210 }
 211
 212 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 213 {
 214         char *line = *lineptr;
 215         size_t slen = 0;
 216
 217         for (;;) {
 218                 int c = getc(stream);
 219
 220                 switch (c) {
 221                 case '\n':
 222                         if (add_byte(c, &line, slen, n) < 0)
 223                                 goto e_out;
 224                         slen++;
 225                         /* fall through */
 226                 case EOF:
 227                         if (add_byte('\0', &line, slen, n) < 0)
 228                                 goto e_out;
 229                         *lineptr = line;
 230                         if (slen == 0)
 231                                 return -1;
 232                         return slen;
 233                 default:
 234                         if (add_byte(c, &line, slen, n) < 0)
 235                                 goto e_out;
 236                         slen++;
 237                 }
 238         }
 239
 240 e_out:
 241         line[slen-1] = '\0';
 242         *lineptr = line;
 243         return -1;
 244 }
 245
 246 int conf_read_simple(const char *name, int def)
 247 {
 248         FILE *in = NULL;
 249         char   *line = NULL;
 250         size_t  line_asize = 0;
 251         char *p, *p2;
 252         struct symbol *sym;
 253         int i, def_flags;
 254
 255         if (name) {
 256                 in = zconf_fopen(name);
 257         } else {
 258                 struct property *prop;
 259
 260                 name = conf_get_configname();
 261                 in = zconf_fopen(name);
 262                 if (in)
 263                         goto load;
 264                 sym_add_change_count(1);
 265                 if (!sym_defconfig_list) {
 266                         if (modules_sym)
 267                                 sym_calc_value(modules_sym);
 268                         return 1;
 269                 }
 270
 271                 for_all_defaults(sym_defconfig_list, prop) {
 272                         if (expr_calc_value(prop->visible.expr) == no ||
 273                             prop->expr->type != E_SYMBOL)
 274                                 continue;
 275                         name = conf_expand_value(prop->expr->left.sym->name);
 276                         in = zconf_fopen(name);
 277                         if (in) {
 278                                 conf_message(_("using defaults found in %s"),
 279                                          name);
 280                                 goto load;
 281                         }
 282                 }
 283         }
 284         if (!in)
 285                 return 1;
 286
 287 load:
 288         conf_filename = name;
 289         conf_lineno = 0;
 290         conf_warnings = 0;
 291         conf_unsaved = 0;
 292
 293         def_flags = SYMBOL_DEF << def;
 294         for_all_symbols(i, sym) {
 295                 sym->flags |= SYMBOL_CHANGED;
 296                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 297                 if (sym_is_choice(sym))
 298                         sym->flags |= def_flags;
 299                 switch (sym->type) {
 300                 case S_INT:
 301                 case S_HEX:
 302                 case S_STRING:
 303                         if (sym->def[def].val)
 304                                 free(sym->def[def].val);
 305                         /* fall through */
 306                 default:
 307                         sym->def[def].val = NULL;
 308                         sym->def[def].tri = no;
 309                 }
 310         }
 311
 312         while (compat_getline(&line, &line_asize, in) != -1) {
 313                 conf_lineno++;
 314                 sym = NULL;
 315                 if (line[0] == '#') {
 316                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 317                                 continue;
 318                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 319                         if (!p)
 320                                 continue;
 321                         *p++ = 0;
 322                         if (strncmp(p, "is not set", 10))
 323                                 continue;
 324                         if (def == S_DEF_USER) {
 325                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 326                                 if (!sym) {
 327                                         sym_add_change_count(1);
 328                                         goto setsym;
 329                                 }
 330                         } else {
 331                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 332                                 if (sym->type == S_UNKNOWN)
 333                                         sym->type = S_BOOLEAN;
 334                         }
 335                         if (sym->flags & def_flags) {
 336                                 conf_warning("override: reassigning to symbol %s", sym->name);
 337                         }
 338                         switch (sym->type) {
 339                         case S_BOOLEAN:
 340                         case S_TRISTATE:
 341                                 sym->def[def].tri = no;
 342                                 sym->flags |= def_flags;
 343                                 break;
 344                         default:
 345                                 ;
 346                         }
 347                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 348                         p = strchr(line + strlen(CONFIG_), '=');
 349                         if (!p)
 350                                 continue;
 351                         *p++ = 0;
 352                         p2 = strchr(p, '\n');
 353                         if (p2) {
 354                                 *p2-- = 0;
 355                                 if (*p2 == '\r')
 356                                         *p2 = 0;
 357                         }
 358                         if (def == S_DEF_USER) {
 359                                 sym = sym_find(line + strlen(CONFIG_));
 360                                 if (!sym) {
 361                                         sym_add_change_count(1);
 362                                         goto setsym;
 363                                 }
 364                         } else {
 365                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 366                                 if (sym->type == S_UNKNOWN)
 367                                         sym->type = S_OTHER;
 368                         }
 369                         if (sym->flags & def_flags) {
 370                                 conf_warning("override: reassigning to symbol %s", sym->name);
 371                         }
 372                         if (conf_set_sym_val(sym, def, def_flags, p))
 373                                 continue;
 374                 } else {
 375                         if (line[0] != '\r' && line[0] != '\n')
 376                                 conf_warning("unexpected data");
 377                         continue;
 378                 }
 379 setsym:
 380                 if (sym && sym_is_choice_value(sym)) {
 381                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 382                         switch (sym->def[def].tri) {
 383                         case no:
 384                                 break;
 385                         case mod:
 386                                 if (cs->def[def].tri == yes) {
 387                                         conf_warning("%s creates inconsistent choice state", sym->name);
 388                                         cs->flags &= ~def_flags;
 389                                 }
 390                                 break;
 391                         case yes:
 392                                 if (cs->def[def].tri != no)
 393                                         conf_warning("override: %s changes choice state", sym->name);
 394                                 cs->def[def].val = sym;
 395                                 break;
 396                         }
 397                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 398                 }
 399         }
 400         free(line);
 401         fclose(in);
 402
 403         if (modules_sym)
 404                 sym_calc_value(modules_sym);
 405         return 0;
 406 }
 407
 408 int conf_read(const char *name)
 409 {
 410         struct symbol *sym;
 411         int i;
 412
 413         sym_set_change_count(0);
 414
 415         if (conf_read_simple(name, S_DEF_USER))
 416                 return 1;
 417
 418         for_all_symbols(i, sym) {
 419                 sym_calc_value(sym);
 420                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 421                         continue;
 422                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 423                         /* check that calculated value agrees with saved value */
 424                         switch (sym->type) {
 425                         case S_BOOLEAN:
 426                         case S_TRISTATE:
 427                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 428                                         break;
 429                                 if (!sym_is_choice(sym))
 430                                         continue;
 431                                 /* fall through */
 432                         default:
 433                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 434                                         continue;
 435                                 break;
 436                         }
 437                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 438                         /* no previous value and not saved */
 439                         continue;
 440                 conf_unsaved++;
 441                 /* maybe print value in verbose mode... */
 442         }
 443
 444         for_all_symbols(i, sym) {
 445                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 446                         /* Reset values of generates values, so they'll appear
 447                          * as new, if they should become visible, but that
 448                          * doesn't quite work if the Kconfig and the saved
 449                          * configuration disagree.
 450                          */
 451                         if (sym->visible == no && !conf_unsaved)
 452                                 sym->flags &= ~SYMBOL_DEF_USER;
 453                         switch (sym->type) {
 454                         case S_STRING:
 455                         case S_INT:
 456                         case S_HEX:
 457                                 /* Reset a string value if it's out of range */
 458                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 459                                         break;
 460                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 461                                 conf_unsaved++;
 462                                 break;
 463                         default:
 464                                 break;
 465                         }
 466                 }
 467         }
 468
 469         sym_add_change_count(conf_warnings || conf_unsaved);
 470
 471         return 0;
 472 }
 473
 474 /*
 475  * Kconfig configuration printer
 476  *
 477  * This printer is used when generating the resulting configuration after
 478  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 479  * passing a non-NULL argument to the printer.
 480  *
 481  */
 482 static void
 483 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 484 {
 485
 486         switch (sym->type) {
 487         case S_BOOLEAN:
 488         case S_TRISTATE:
 489                 if (*value == 'n') {
 490                         bool skip_unset = (arg != NULL);
 491
 492                         if (!skip_unset)
 493                                 fprintf(fp, "# %s%s is not set\n",
 494                                     CONFIG_, sym->name);
 495                         return;
 496                 }
 497                 break;
 498         default:
 499                 break;
 500         }
 501
 502         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 503 }
 504
 505 static void
 506 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 507 {
 508         const char *p = value;
 509         size_t l;
 510
 511         for (;;) {
 512                 l = strcspn(p, "\n");
 513                 fprintf(fp, "#");
 514                 if (l) {
 515                         fprintf(fp, " ");
 516                         xfwrite(p, l, 1, fp);
 517                         p += l;
 518                 }
 519                 fprintf(fp, "\n");
 520                 if (*p++ == '\0')
 521                         break;
 522         }
 523 }
 524
 525 static struct conf_printer kconfig_printer_cb =
 526 {
 527         .print_symbol = kconfig_print_symbol,
 528         .print_comment = kconfig_print_comment,
 529 };
 530
 531 /*
 532  * Header printer
 533  *
 534  * This printer is used when generating the `include/generated/autoconf.h' file.
 535  */
 536 static void
 537 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 538 {
 539
 540         switch (sym->type) {
 541         case S_BOOLEAN:
 542         case S_TRISTATE: {
 543                 const char *suffix = "";
 544
 545                 switch (*value) {
 546                 case 'n':
 547                         break;
 548                 case 'm':
 549                         suffix = "_MODULE";
 550                         /* fall through */
 551                 default:
 552                         fprintf(fp, "#define %s%s%s 1\n",
 553                             CONFIG_, sym->name, suffix);
 554                 }
 555                 break;
 556         }
 557         case S_HEX: {
 558                 const char *prefix = "";
 559
 560                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 561                         prefix = "0x";
 562                 fprintf(fp, "#define %s%s %s%s\n",
 563                     CONFIG_, sym->name, prefix, value);
 564                 break;
 565         }
 566         case S_STRING:
 567         case S_INT:
 568                 fprintf(fp, "#define %s%s %s\n",
 569                     CONFIG_, sym->name, value);
 570                 break;
 571         default:
 572                 break;
 573         }
 574
 575 }
 576
 577 static void
 578 header_print_comment(FILE *fp, const char *value, void *arg)
 579 {
 580         const char *p = value;
 581         size_t l;
 582
 583         fprintf(fp, "/*\n");
 584         for (;;) {
 585                 l = strcspn(p, "\n");
 586                 fprintf(fp, " *");
 587                 if (l) {
 588                         fprintf(fp, " ");
 589                         xfwrite(p, l, 1, fp);
 590                         p += l;
 591                 }
 592                 fprintf(fp, "\n");
 593                 if (*p++ == '\0')
 594                         break;
 595         }
 596         fprintf(fp, " */\n");
 597 }
 598
 599 static struct conf_printer header_printer_cb =
 600 {
 601         .print_symbol = header_print_symbol,
 602         .print_comment = header_print_comment,
 603 };
 604
 605 /*
 606  * Tristate printer
 607  *
 608  * This printer is used when generating the `include/config/tristate.conf' file.
 609  */
 610 static void
 611 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 612 {
 613
 614         if (sym->type == S_TRISTATE && *value != 'n')
 615                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 616 }
 617
 618 static struct conf_printer tristate_printer_cb =
 619 {
 620         .print_symbol = tristate_print_symbol,
 621         .print_comment = kconfig_print_comment,
 622 };
 623
 624 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 625                               struct conf_printer *printer, void *printer_arg)
 626 {
 627         const char *str;
 628
 629         switch (sym->type) {
 630         case S_OTHER:
 631         case S_UNKNOWN:
 632                 break;
 633         case S_STRING:
 634                 str = sym_get_string_value(sym);
 635                 str = sym_escape_string_value(str);
 636                 printer->print_symbol(fp, sym, str, printer_arg);
 637                 free((void *)str);
 638                 break;
 639         default:
 640                 str = sym_get_string_value(sym);
 641                 printer->print_symbol(fp, sym, str, printer_arg);
 642         }
 643 }
 644
 645 static void
 646 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 647 {
 648         char buf[256];
 649
 650         snprintf(buf, sizeof(buf),
 651             "\n"
 652             "Automatically generated file; DO NOT EDIT.\n"
 653             "%s\n",
 654             rootmenu.prompt->text);
 655
 656         printer->print_comment(fp, buf, printer_arg);
 657 }
 658
 659 /*
 660  * Write out a minimal config.
 661  * All values that has default values are skipped as this is redundant.
 662  */
 663 int conf_write_defconfig(const char *filename)
 664 {
 665         struct symbol *sym;
 666         struct menu *menu;
 667         FILE *out;
 668
 669         out = fopen(filename, "w");
 670         if (!out)
 671                 return 1;
 672
 673         sym_clear_all_valid();
 674
 675         /* Traverse all menus to find all relevant symbols */
 676         menu = rootmenu.list;
 677
 678         while (menu != NULL)
 679         {
 680                 sym = menu->sym;
 681                 if (sym == NULL) {
 682                         if (!menu_is_visible(menu))
 683                                 goto next_menu;
 684                 } else if (!sym_is_choice(sym)) {
 685                         sym_calc_value(sym);
 686                         if (!(sym->flags & SYMBOL_WRITE))
 687                                 goto next_menu;
 688                         sym->flags &= ~SYMBOL_WRITE;
 689                         /* If we cannot change the symbol - skip */
 690                         if (!sym_is_changable(sym))
 691                                 goto next_menu;
 692                         /* If symbol equals to default value - skip */
 693                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 694                                 goto next_menu;
 695
 696                         /*
 697                          * If symbol is a choice value and equals to the
 698                          * default for a choice - skip.
 699                          * But only if value is bool and equal to "y" and
 700                          * choice is not "optional".
 701                          * (If choice is "optional" then all values can be "n")
 702                          */
 703                         if (sym_is_choice_value(sym)) {
 704                                 struct symbol *cs;
 705                                 struct symbol *ds;
 706
 707                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 708                                 ds = sym_choice_default(cs);
 709                                 if (!sym_is_optional(cs) && sym == ds) {
 710                                         if ((sym->type == S_BOOLEAN) &&
 711                                             sym_get_tristate_value(sym) == yes)
 712                                                 goto next_menu;
 713                                 }
 714                         }
 715                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 716                 }
 717 next_menu:
 718                 if (menu->list != NULL) {
 719                         menu = menu->list;
 720                 }
 721                 else if (menu->next != NULL) {
 722                         menu = menu->next;
 723                 } else {
 724                         while ((menu = menu->parent)) {
 725                                 if (menu->next != NULL) {
 726                                         menu = menu->next;
 727                                         break;
 728                                 }
 729                         }
 730                 }
 731         }
 732         fclose(out);
 733         return 0;
 734 }
 735
 736 int conf_write(const char *name)
 737 {
 738         FILE *out;
 739         struct symbol *sym;
 740         struct menu *menu;
 741         const char *basename;
 742         const char *str;
 743         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 744         char *env;
 745
 746         dirname[0] = 0;
 747         if (name && name[0]) {
 748                 struct stat st;
 749                 char *slash;
 750
 751                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 752                         strcpy(dirname, name);
 753                         strcat(dirname, "/");
 754                         basename = conf_get_configname();
 755                 } else if ((slash = strrchr(name, '/'))) {
 756                         int size = slash - name + 1;
 757                         memcpy(dirname, name, size);
 758                         dirname[size] = 0;
 759                         if (slash[1])
 760                                 basename = slash + 1;
 761                         else
 762                                 basename = conf_get_configname();
 763                 } else
 764                         basename = name;
 765         } else
 766                 basename = conf_get_configname();
 767
 768         sprintf(newname, "%s%s", dirname, basename);
 769         env = getenv("KCONFIG_OVERWRITECONFIG");
 770         if (!env || !*env) {
 771                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 772                 out = fopen(tmpname, "w");
 773         } else {
 774                 *tmpname = 0;
 775                 out = fopen(newname, "w");
 776         }
 777         if (!out)
 778                 return 1;
 779
 780         conf_write_heading(out, &kconfig_printer_cb, NULL);
 781
 782         if (!conf_get_changed())
 783                 sym_clear_all_valid();
 784
 785         menu = rootmenu.list;
 786         while (menu) {
 787                 sym = menu->sym;
 788                 if (!sym) {
 789                         if (!menu_is_visible(menu))
 790                                 goto next;
 791                         str = menu_get_prompt(menu);
 792                         fprintf(out, "\n"
 793                                      "#\n"
 794                                      "# %s\n"
 795                                      "#\n", str);
 796                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 797                         sym_calc_value(sym);
 798                         if (!(sym->flags & SYMBOL_WRITE))
 799                                 goto next;
 800                         sym->flags &= ~SYMBOL_WRITE;
 801
 802                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 803                 }
 804
 805 next:
 806                 if (menu->list) {
 807                         menu = menu->list;
 808                         continue;
 809                 }
 810                 if (menu->next)
 811                         menu = menu->next;
 812                 else while ((menu = menu->parent)) {
 813                         if (menu->next) {
 814                                 menu = menu->next;
 815                                 break;
 816                         }
 817                 }
 818         }
 819         fclose(out);
 820
 821         if (*tmpname) {
 822                 strcat(dirname, basename);
 823                 strcat(dirname, ".old");
 824                 rename(newname, dirname);
 825                 if (rename(tmpname, newname))
 826                         return 1;
 827         }
 828
 829         conf_message(_("configuration written to %s"), newname);
 830
 831         sym_set_change_count(0);
 832
 833         return 0;
 834 }
 835
 836 static int conf_split_config(void)
 837 {
 838         const char *name;
 839         char path[PATH_MAX+1];
 840         char *s, *d, c;
 841         struct symbol *sym;
 842         struct stat sb;
 843         int res, i, fd;
 844
 845         name = conf_get_autoconfig_name();
 846         conf_read_simple(name, S_DEF_AUTO);
 847
 848         if (chdir("include/config"))
 849                 return 1;
 850
 851         res = 0;
 852         for_all_symbols(i, sym) {
 853                 sym_calc_value(sym);
 854                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 855                         continue;
 856                 if (sym->flags & SYMBOL_WRITE) {
 857                         if (sym->flags & SYMBOL_DEF_AUTO) {
 858                                 /*
 859                                  * symbol has old and new value,
 860                                  * so compare them...
 861                                  */
 862                                 switch (sym->type) {
 863                                 case S_BOOLEAN:
 864                                 case S_TRISTATE:
 865                                         if (sym_get_tristate_value(sym) ==
 866                                             sym->def[S_DEF_AUTO].tri)
 867                                                 continue;
 868                                         break;
 869                                 case S_STRING:
 870                                 case S_HEX:
 871                                 case S_INT:
 872                                         if (!strcmp(sym_get_string_value(sym),
 873                                                     sym->def[S_DEF_AUTO].val))
 874                                                 continue;
 875                                         break;
 876                                 default:
 877                                         break;
 878                                 }
 879                         } else {
 880                                 /*
 881                                  * If there is no old value, only 'no' (unset)
 882                                  * is allowed as new value.
 883                                  */
 884                                 switch (sym->type) {
 885                                 case S_BOOLEAN:
 886                                 case S_TRISTATE:
 887                                         if (sym_get_tristate_value(sym) == no)
 888                                                 continue;
 889                                         break;
 890                                 default:
 891                                         break;
 892                                 }
 893                         }
 894                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 895                         /* There is neither an old nor a new value. */
 896                         continue;
 897                 /* else
 898                  *      There is an old value, but no new value ('no' (unset)
 899                  *      isn't saved in auto.conf, so the old value is always
 900                  *      different from 'no').
 901                  */
 902
 903                 /* Replace all '_' and append ".h" */
 904                 s = sym->name;
 905                 d = path;
 906                 while ((c = *s++)) {
 907                         c = tolower(c);
 908                         *d++ = (c == '_') ? '/' : c;
 909                 }
 910                 strcpy(d, ".h");
 911
 912                 /* Assume directory path already exists. */
 913                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 914                 if (fd == -1) {
 915                         if (errno != ENOENT) {
 916                                 res = 1;
 917                                 break;
 918                         }
 919                         /*
 920                          * Create directory components,
 921                          * unless they exist already.
 922                          */
 923                         d = path;
 924                         while ((d = strchr(d, '/'))) {
 925                                 *d = 0;
 926                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 927                                         res = 1;
 928                                         goto out;
 929                                 }
 930                                 *d++ = '/';
 931                         }
 932                         /* Try it again. */
 933                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 934                         if (fd == -1) {
 935                                 res = 1;
 936                                 break;
 937                         }
 938                 }
 939                 close(fd);
 940         }
 941 out:
 942         if (chdir("../.."))
 943                 return 1;
 944
 945         return res;
 946 }
 947
 948 int conf_write_autoconf(void)
 949 {
 950         struct symbol *sym;
 951         const char *name;
 952         FILE *out, *tristate, *out_h;
 953         int i;
 954
 955         sym_clear_all_valid();
 956
 957         file_write_dep("include/config/auto.conf.cmd");
 958
 959         if (conf_split_config())
 960                 return 1;
 961
 962         out = fopen(".tmpconfig", "w");
 963         if (!out)
 964                 return 1;
 965
 966         tristate = fopen(".tmpconfig_tristate", "w");
 967         if (!tristate) {
 968                 fclose(out);
 969                 return 1;
 970         }
 971
 972         out_h = fopen(".tmpconfig.h", "w");
 973         if (!out_h) {
 974                 fclose(out);
 975                 fclose(tristate);
 976                 return 1;
 977         }
 978
 979         conf_write_heading(out, &kconfig_printer_cb, NULL);
 980
 981         conf_write_heading(tristate, &tristate_printer_cb, NULL);
 982
 983         conf_write_heading(out_h, &header_printer_cb, NULL);
 984
 985         for_all_symbols(i, sym) {
 986                 sym_calc_value(sym);
 987                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 988                         continue;
 989
 990                 /* write symbol to auto.conf, tristate and header files */
 991                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
 992
 993                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 994
 995                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 996         }
 997         fclose(out);
 998         fclose(tristate);
 999         fclose(out_h);
1000
1001         name = getenv("KCONFIG_AUTOHEADER");
1002         if (!name)
1003                 name = "include/generated/autoconf.h";
1004         if (rename(".tmpconfig.h", name))
1005                 return 1;
1006         name = getenv("KCONFIG_TRISTATE");
1007         if (!name)
1008                 name = "include/config/tristate.conf";
1009         if (rename(".tmpconfig_tristate", name))
1010                 return 1;
1011         name = conf_get_autoconfig_name();
1012         /*
1013          * This must be the last step, kbuild has a dependency on auto.conf
1014          * and this marks the successful completion of the previous steps.
1015          */
1016         if (rename(".tmpconfig", name))
1017                 return 1;
1018
1019         return 0;
1020 }
1021
1022 static int sym_change_count;
1023 static void (*conf_changed_callback)(void);
1024
1025 void sym_set_change_count(int count)
1026 {
1027         int _sym_change_count = sym_change_count;
1028         sym_change_count = count;
1029         if (conf_changed_callback &&
1030             (bool)_sym_change_count != (bool)count)
1031                 conf_changed_callback();
1032 }
1033
1034 void sym_add_change_count(int count)
1035 {
1036         sym_set_change_count(count + sym_change_count);
1037 }
1038
1039 bool conf_get_changed(void)
1040 {
1041         return sym_change_count;
1042 }
1043
1044 void conf_set_changed_callback(void (*fn)(void))
1045 {
1046         conf_changed_callback = fn;
1047 }
1048
1049 static bool randomize_choice_values(struct symbol *csym)
1050 {
1051         struct property *prop;
1052         struct symbol *sym;
1053         struct expr *e;
1054         int cnt, def;
1055
1056         /*
1057          * If choice is mod then we may have more items selected
1058          * and if no then no-one.
1059          * In both cases stop.
1060          */
1061         if (csym->curr.tri != yes)
1062                 return false;
1063
1064         prop = sym_get_choice_prop(csym);
1065
1066         /* count entries in choice block */
1067         cnt = 0;
1068         expr_list_for_each_sym(prop->expr, e, sym)
1069                 cnt++;
1070
1071         /*
1072          * find a random value and set it to yes,
1073          * set the rest to no so we have only one set
1074          */
1075         def = (rand() % cnt);
1076
1077         cnt = 0;
1078         expr_list_for_each_sym(prop->expr, e, sym) {
1079                 if (def == cnt++) {
1080                         sym->def[S_DEF_USER].tri = yes;
1081                         csym->def[S_DEF_USER].val = sym;
1082                 }
1083                 else {
1084                         sym->def[S_DEF_USER].tri = no;
1085                 }
1086                 sym->flags |= SYMBOL_DEF_USER;
1087                 /* clear VALID to get value calculated */
1088                 sym->flags &= ~SYMBOL_VALID;
1089         }
1090         csym->flags |= SYMBOL_DEF_USER;
1091         /* clear VALID to get value calculated */
1092         csym->flags &= ~(SYMBOL_VALID);
1093
1094         return true;
1095 }
1096
1097 void set_all_choice_values(struct symbol *csym)
1098 {
1099         struct property *prop;
1100         struct symbol *sym;
1101         struct expr *e;
1102
1103         prop = sym_get_choice_prop(csym);
1104
1105         /*
1106          * Set all non-assinged choice values to no
1107          */
1108         expr_list_for_each_sym(prop->expr, e, sym) {
1109                 if (!sym_has_value(sym))
1110                         sym->def[S_DEF_USER].tri = no;
1111         }
1112         csym->flags |= SYMBOL_DEF_USER;
1113         /* clear VALID to get value calculated */
1114         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1115 }
1116
1117 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1118 {
1119         struct symbol *sym, *csym;
1120         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1121                                          * pty: probability of tristate = y
1122                                          * ptm: probability of tristate = m
1123                                          */
1124
1125         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1126                                    * below, otherwise gcc whines about
1127                                    * -Wmaybe-uninitialized */
1128         if (mode == def_random) {
1129                 int n, p[3];
1130                 char *env = getenv("KCONFIG_PROBABILITY");
1131                 n = 0;
1132                 while( env && *env ) {
1133                         char *endp;
1134                         int tmp = strtol( env, &endp, 10 );
1135                         if( tmp >= 0 && tmp <= 100 ) {
1136                                 p[n++] = tmp;
1137                         } else {
1138                                 errno = ERANGE;
1139                                 perror( "KCONFIG_PROBABILITY" );
1140                                 exit( 1 );
1141                         }
1142                         env = (*endp == ':') ? endp+1 : endp;
1143                         if( n >=3 ) {
1144                                 break;
1145                         }
1146                 }
1147                 switch( n ) {
1148                 case 1:
1149                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1150                         break;
1151                 case 2:
1152                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1153                         break;
1154                 case 3:
1155                         pby = p[0]; pty = p[1]; ptm = p[2];
1156                         break;
1157                 }
1158
1159                 if( pty+ptm > 100 ) {
1160                         errno = ERANGE;
1161                         perror( "KCONFIG_PROBABILITY" );
1162                         exit( 1 );
1163                 }
1164         }
1165         bool has_changed = false;
1166
1167         for_all_symbols(i, sym) {
1168                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1169                         continue;
1170                 switch (sym_get_type(sym)) {
1171                 case S_BOOLEAN:
1172                 case S_TRISTATE:
1173                         has_changed = true;
1174                         switch (mode) {
1175                         case def_yes:
1176                                 sym->def[S_DEF_USER].tri = yes;
1177                                 break;
1178                         case def_mod:
1179                                 sym->def[S_DEF_USER].tri = mod;
1180                                 break;
1181                         case def_no:
1182                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1183                                         sym->def[S_DEF_USER].tri = yes;
1184                                 else
1185                                         sym->def[S_DEF_USER].tri = no;
1186                                 break;
1187                         case def_random:
1188                                 sym->def[S_DEF_USER].tri = no;
1189                                 cnt = rand() % 100;
1190                                 if (sym->type == S_TRISTATE) {
1191                                         if (cnt < pty)
1192                                                 sym->def[S_DEF_USER].tri = yes;
1193                                         else if (cnt < (pty+ptm))
1194                                                 sym->def[S_DEF_USER].tri = mod;
1195                                 } else if (cnt < pby)
1196                                         sym->def[S_DEF_USER].tri = yes;
1197                                 break;
1198                         default:
1199                                 continue;
1200                         }
1201                         if (!(sym_is_choice(sym) && mode == def_random))
1202                                 sym->flags |= SYMBOL_DEF_USER;
1203                         break;
1204                 default:
1205                         break;
1206                 }
1207
1208         }
1209
1210         sym_clear_all_valid();
1211
1212         /*
1213          * We have different type of choice blocks.
1214          * If curr.tri equals to mod then we can select several
1215          * choice symbols in one block.
1216          * In this case we do nothing.
1217          * If curr.tri equals yes then only one symbol can be
1218          * selected in a choice block and we set it to yes,
1219          * and the rest to no.
1220          */
1221         if (mode != def_random) {
1222                 for_all_symbols(i, csym) {
1223                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1224                             sym_is_choice_value(csym))
1225                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1226                 }
1227         }
1228
1229         for_all_symbols(i, csym) {
1230                 if (sym_has_value(csym) || !sym_is_choice(csym))
1231                         continue;
1232
1233                 sym_calc_value(csym);
1234                 if (mode == def_random)
1235                         has_changed = randomize_choice_values(csym);
1236                 else {
1237                         set_all_choice_values(csym);
1238                         has_changed = true;
1239                 }
1240         }
1241
1242         return has_changed;
1243 }