cirros-testvm/src-cirros/buildroot-2015.05/support/kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16 #include <libgen.h>
  17
  18 #include "lkc.h"
  19
  20 static void conf_warning(const char *fmt, ...)
  21         __attribute__ ((format (printf, 1, 2)));
  22
  23 static void conf_message(const char *fmt, ...)
  24         __attribute__ ((format (printf, 1, 2)));
  25
  26 static const char *conf_filename;
  27 static int conf_lineno, conf_warnings, conf_unsaved;
  28
  29 const char conf_defname[] = ".defconfig";
  30
  31 static void conf_warning(const char *fmt, ...)
  32 {
  33         va_list ap;
  34         va_start(ap, fmt);
  35         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  36         vfprintf(stderr, fmt, ap);
  37         fprintf(stderr, "\n");
  38         va_end(ap);
  39         conf_warnings++;
  40 }
  41
  42 static void conf_default_message_callback(const char *fmt, va_list ap)
  43 {
  44         printf("#\n# ");
  45         vprintf(fmt, ap);
  46         printf("\n#\n");
  47 }
  48
  49 static void (*conf_message_callback) (const char *fmt, va_list ap) =
  50         conf_default_message_callback;
  51 void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
  52 {
  53         conf_message_callback = fn;
  54 }
  55
  56 static void conf_message(const char *fmt, ...)
  57 {
  58         va_list ap;
  59
  60         va_start(ap, fmt);
  61         if (conf_message_callback)
  62                 conf_message_callback(fmt, ap);
  63 }
  64
  65 const char *conf_get_configname(void)
  66 {
  67         char *name = getenv("BR2_CONFIG");
  68
  69         return name ? name : ".config";
  70 }
  71
  72 const char *conf_get_autoconfig_name(void)
  73 {
  74         return getenv("KCONFIG_AUTOCONFIG");
  75 }
  76
  77 static char *conf_expand_value(const char *in)
  78 {
  79         struct symbol *sym;
  80         const char *src;
  81         static char res_value[SYMBOL_MAXLENGTH];
  82         char *dst, name[SYMBOL_MAXLENGTH];
  83
  84         res_value[0] = 0;
  85         dst = name;
  86         while ((src = strchr(in, '$'))) {
  87                 strncat(res_value, in, src - in);
  88                 src++;
  89                 dst = name;
  90                 while (isalnum(*src) || *src == '_')
  91                         *dst++ = *src++;
  92                 *dst = 0;
  93                 sym = sym_lookup(name, 0);
  94                 sym_calc_value(sym);
  95                 strcat(res_value, sym_get_string_value(sym));
  96                 in = src;
  97         }
  98         strcat(res_value, in);
  99
 100         return res_value;
 101 }
 102
 103 char *conf_get_default_confname(void)
 104 {
 105         struct stat buf;
 106         static char fullname[PATH_MAX+1];
 107         char *env, *name;
 108
 109         name = conf_expand_value(conf_defname);
 110         env = getenv(SRCTREE);
 111         if (env) {
 112                 sprintf(fullname, "%s/%s", env, name);
 113                 if (!stat(fullname, &buf))
 114                         return fullname;
 115         }
 116         return name;
 117 }
 118
 119 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 120 {
 121         char *p2;
 122
 123         switch (sym->type) {
 124         case S_TRISTATE:
 125                 if (p[0] == 'm') {
 126                         sym->def[def].tri = mod;
 127                         sym->flags |= def_flags;
 128                         break;
 129                 }
 130                 /* fall through */
 131         case S_BOOLEAN:
 132                 if (p[0] == 'y') {
 133                         sym->def[def].tri = yes;
 134                         sym->flags |= def_flags;
 135                         break;
 136                 }
 137                 if (p[0] == 'n') {
 138                         sym->def[def].tri = no;
 139                         sym->flags |= def_flags;
 140                         break;
 141                 }
 142                 if (def != S_DEF_AUTO)
 143                         conf_warning("symbol value '%s' invalid for %s",
 144                                      p, sym->name);
 145                 return 1;
 146         case S_OTHER:
 147                 if (*p != '"') {
 148                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 149                                 ;
 150                         sym->type = S_STRING;
 151                         goto done;
 152                 }
 153                 /* fall through */
 154         case S_STRING:
 155                 if (*p++ != '"')
 156                         break;
 157                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 158                         if (*p2 == '"') {
 159                                 *p2 = 0;
 160                                 break;
 161                         }
 162                         memmove(p2, p2 + 1, strlen(p2));
 163                 }
 164                 if (!p2) {
 165                         if (def != S_DEF_AUTO)
 166                                 conf_warning("invalid string found");
 167                         return 1;
 168                 }
 169                 /* fall through */
 170         case S_INT:
 171         case S_HEX:
 172         done:
 173                 if (sym_string_valid(sym, p)) {
 174                         sym->def[def].val = strdup(p);
 175                         sym->flags |= def_flags;
 176                 } else {
 177                         if (def != S_DEF_AUTO)
 178                                 conf_warning("symbol value '%s' invalid for %s",
 179                                              p, sym->name);
 180                         return 1;
 181                 }
 182                 break;
 183         default:
 184                 ;
 185         }
 186         return 0;
 187 }
 188
 189 #define LINE_GROWTH 16
 190 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 191 {
 192         char *nline;
 193         size_t new_size = slen + 1;
 194         if (new_size > *n) {
 195                 new_size += LINE_GROWTH - 1;
 196                 new_size *= 2;
 197                 nline = realloc(*lineptr, new_size);
 198                 if (!nline)
 199                         return -1;
 200
 201                 *lineptr = nline;
 202                 *n = new_size;
 203         }
 204
 205         (*lineptr)[slen] = c;
 206
 207         return 0;
 208 }
 209
 210 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 211 {
 212         char *line = *lineptr;
 213         size_t slen = 0;
 214
 215         for (;;) {
 216                 int c = getc(stream);
 217
 218                 switch (c) {
 219                 case '\n':
 220                         if (add_byte(c, &line, slen, n) < 0)
 221                                 goto e_out;
 222                         slen++;
 223                         /* fall through */
 224                 case EOF:
 225                         if (add_byte('\0', &line, slen, n) < 0)
 226                                 goto e_out;
 227                         *lineptr = line;
 228                         if (slen == 0)
 229                                 return -1;
 230                         return slen;
 231                 default:
 232                         if (add_byte(c, &line, slen, n) < 0)
 233                                 goto e_out;
 234                         slen++;
 235                 }
 236         }
 237
 238 e_out:
 239         line[slen-1] = '\0';
 240         *lineptr = line;
 241         return -1;
 242 }
 243
 244 int conf_read_simple(const char *name, int def)
 245 {
 246         FILE *in = NULL;
 247         char   *line = NULL;
 248         size_t  line_asize = 0;
 249         char *p, *p2;
 250         struct symbol *sym;
 251         int i, def_flags;
 252
 253         if (name) {
 254                 in = zconf_fopen(name);
 255         } else {
 256                 struct property *prop;
 257
 258                 name = conf_get_configname();
 259                 in = zconf_fopen(name);
 260                 if (in)
 261                         goto load;
 262                 sym_add_change_count(1);
 263                 if (!sym_defconfig_list) {
 264                         if (modules_sym)
 265                                 sym_calc_value(modules_sym);
 266                         return 1;
 267                 }
 268
 269                 for_all_defaults(sym_defconfig_list, prop) {
 270                         if (expr_calc_value(prop->visible.expr) == no ||
 271                             prop->expr->type != E_SYMBOL)
 272                                 continue;
 273                         name = conf_expand_value(prop->expr->left.sym->name);
 274                         in = zconf_fopen(name);
 275                         if (in) {
 276                                 conf_message(_("using defaults found in %s"),
 277                                          name);
 278                                 goto load;
 279                         }
 280                 }
 281         }
 282         if (!in)
 283                 return 1;
 284
 285 load:
 286         conf_filename = name;
 287         conf_lineno = 0;
 288         conf_warnings = 0;
 289         conf_unsaved = 0;
 290
 291         def_flags = SYMBOL_DEF << def;
 292         for_all_symbols(i, sym) {
 293                 sym->flags |= SYMBOL_CHANGED;
 294                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 295                 if (sym_is_choice(sym))
 296                         sym->flags |= def_flags;
 297                 switch (sym->type) {
 298                 case S_INT:
 299                 case S_HEX:
 300                 case S_STRING:
 301                         if (sym->def[def].val)
 302                                 free(sym->def[def].val);
 303                         /* fall through */
 304                 default:
 305                         sym->def[def].val = NULL;
 306                         sym->def[def].tri = no;
 307                 }
 308         }
 309
 310         while (compat_getline(&line, &line_asize, in) != -1) {
 311                 conf_lineno++;
 312                 sym = NULL;
 313                 if (line[0] == '#') {
 314                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 315                                 continue;
 316                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 317                         if (!p)
 318                                 continue;
 319                         *p++ = 0;
 320                         if (strncmp(p, "is not set", 10))
 321                                 continue;
 322                         if (def == S_DEF_USER) {
 323                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 324                                 if (!sym) {
 325                                         sym_add_change_count(1);
 326                                         goto setsym;
 327                                 }
 328                         } else {
 329                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 330                                 if (sym->type == S_UNKNOWN)
 331                                         sym->type = S_BOOLEAN;
 332                         }
 333                         if (sym->flags & def_flags) {
 334                                 conf_warning("override: reassigning to symbol %s", sym->name);
 335                         }
 336                         switch (sym->type) {
 337                         case S_BOOLEAN:
 338                         case S_TRISTATE:
 339                                 sym->def[def].tri = no;
 340                                 sym->flags |= def_flags;
 341                                 break;
 342                         default:
 343                                 ;
 344                         }
 345                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 346                         p = strchr(line + strlen(CONFIG_), '=');
 347                         if (!p)
 348                                 continue;
 349                         *p++ = 0;
 350                         p2 = strchr(p, '\n');
 351                         if (p2) {
 352                                 *p2-- = 0;
 353                                 if (*p2 == '\r')
 354                                         *p2 = 0;
 355                         }
 356                         if (def == S_DEF_USER) {
 357                                 sym = sym_find(line + strlen(CONFIG_));
 358                                 if (!sym) {
 359                                         sym_add_change_count(1);
 360                                         goto setsym;
 361                                 }
 362                         } else {
 363                                 sym = sym_lookup(line + strlen(CONFIG_), 0);
 364                                 if (sym->type == S_UNKNOWN)
 365                                         sym->type = S_OTHER;
 366                         }
 367                         if (sym->flags & def_flags) {
 368                                 conf_warning("override: reassigning to symbol %s", sym->name);
 369                         }
 370                         if (conf_set_sym_val(sym, def, def_flags, p))
 371                                 continue;
 372                 } else {
 373                         if (line[0] != '\r' && line[0] != '\n')
 374                                 conf_warning("unexpected data");
 375                         continue;
 376                 }
 377 setsym:
 378                 if (sym && sym_is_choice_value(sym)) {
 379                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 380                         switch (sym->def[def].tri) {
 381                         case no:
 382                                 break;
 383                         case mod:
 384                                 if (cs->def[def].tri == yes) {
 385                                         conf_warning("%s creates inconsistent choice state", sym->name);
 386                                         cs->flags &= ~def_flags;
 387                                 }
 388                                 break;
 389                         case yes:
 390                                 if (cs->def[def].tri != no)
 391                                         conf_warning("override: %s changes choice state", sym->name);
 392                                 cs->def[def].val = sym;
 393                                 break;
 394                         }
 395                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 396                 }
 397         }
 398         free(line);
 399         fclose(in);
 400
 401         if (modules_sym)
 402                 sym_calc_value(modules_sym);
 403         return 0;
 404 }
 405
 406 int conf_read(const char *name)
 407 {
 408         struct symbol *sym;
 409         int i;
 410
 411         sym_set_change_count(0);
 412
 413         if (conf_read_simple(name, S_DEF_USER))
 414                 return 1;
 415
 416         for_all_symbols(i, sym) {
 417                 sym_calc_value(sym);
 418                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 419                         continue;
 420                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 421                         /* check that calculated value agrees with saved value */
 422                         switch (sym->type) {
 423                         case S_BOOLEAN:
 424                         case S_TRISTATE:
 425                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 426                                         break;
 427                                 if (!sym_is_choice(sym))
 428                                         continue;
 429                                 /* fall through */
 430                         default:
 431                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 432                                         continue;
 433                                 break;
 434                         }
 435                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 436                         /* no previous value and not saved */
 437                         continue;
 438                 conf_unsaved++;
 439                 /* maybe print value in verbose mode... */
 440         }
 441
 442         for_all_symbols(i, sym) {
 443                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 444                         /* Reset values of generates values, so they'll appear
 445                          * as new, if they should become visible, but that
 446                          * doesn't quite work if the Kconfig and the saved
 447                          * configuration disagree.
 448                          */
 449                         if (sym->visible == no && !conf_unsaved)
 450                                 sym->flags &= ~SYMBOL_DEF_USER;
 451                         switch (sym->type) {
 452                         case S_STRING:
 453                         case S_INT:
 454                         case S_HEX:
 455                                 /* Reset a string value if it's out of range */
 456                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 457                                         break;
 458                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 459                                 conf_unsaved++;
 460                                 break;
 461                         default:
 462                                 break;
 463                         }
 464                 }
 465         }
 466
 467         sym_add_change_count(conf_warnings || conf_unsaved);
 468
 469         return 0;
 470 }
 471
 472 /*
 473  * Kconfig configuration printer
 474  *
 475  * This printer is used when generating the resulting configuration after
 476  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 477  * passing a non-NULL argument to the printer.
 478  *
 479  */
 480 static void
 481 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 482 {
 483
 484         switch (sym->type) {
 485         case S_BOOLEAN:
 486         case S_TRISTATE:
 487                 if (*value == 'n') {
 488                         bool skip_unset = (arg != NULL);
 489
 490                         if (!skip_unset)
 491                                 fprintf(fp, "# %s%s is not set\n",
 492                                     CONFIG_, sym->name);
 493                         return;
 494                 }
 495                 break;
 496         default:
 497                 break;
 498         }
 499
 500         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 501 }
 502
 503 static void
 504 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 505 {
 506         const char *p = value;
 507         size_t l;
 508
 509         for (;;) {
 510                 l = strcspn(p, "\n");
 511                 fprintf(fp, "#");
 512                 if (l) {
 513                         fprintf(fp, " ");
 514                         xfwrite(p, l, 1, fp);
 515                         p += l;
 516                 }
 517                 fprintf(fp, "\n");
 518                 if (*p++ == '\0')
 519                         break;
 520         }
 521 }
 522
 523 static struct conf_printer kconfig_printer_cb =
 524 {
 525         .print_symbol = kconfig_print_symbol,
 526         .print_comment = kconfig_print_comment,
 527 };
 528
 529 /*
 530  * Header printer
 531  *
 532  * This printer is used when generating the `include/generated/autoconf.h' file.
 533  */
 534 static void
 535 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 536 {
 537
 538         switch (sym->type) {
 539         case S_BOOLEAN:
 540         case S_TRISTATE: {
 541                 const char *suffix = "";
 542
 543                 switch (*value) {
 544                 case 'n':
 545                         break;
 546                 case 'm':
 547                         suffix = "_MODULE";
 548                         /* fall through */
 549                 default:
 550                         fprintf(fp, "#define %s%s%s 1\n",
 551                             CONFIG_, sym->name, suffix);
 552                 }
 553                 break;
 554         }
 555         case S_HEX: {
 556                 const char *prefix = "";
 557
 558                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 559                         prefix = "0x";
 560                 fprintf(fp, "#define %s%s %s%s\n",
 561                     CONFIG_, sym->name, prefix, value);
 562                 break;
 563         }
 564         case S_STRING:
 565         case S_INT:
 566                 fprintf(fp, "#define %s%s %s\n",
 567                     CONFIG_, sym->name, value);
 568                 break;
 569         default:
 570                 break;
 571         }
 572
 573 }
 574
 575 static void
 576 header_print_comment(FILE *fp, const char *value, void *arg)
 577 {
 578         const char *p = value;
 579         size_t l;
 580
 581         fprintf(fp, "/*\n");
 582         for (;;) {
 583                 l = strcspn(p, "\n");
 584                 fprintf(fp, " *");
 585                 if (l) {
 586                         fprintf(fp, " ");
 587                         xfwrite(p, l, 1, fp);
 588                         p += l;
 589                 }
 590                 fprintf(fp, "\n");
 591                 if (*p++ == '\0')
 592                         break;
 593         }
 594         fprintf(fp, " */\n");
 595 }
 596
 597 static struct conf_printer header_printer_cb =
 598 {
 599         .print_symbol = header_print_symbol,
 600         .print_comment = header_print_comment,
 601 };
 602
 603 /*
 604  * Tristate printer
 605  *
 606  * This printer is used when generating the `include/config/tristate.conf' file.
 607  */
 608 static void
 609 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 610 {
 611
 612         if (sym->type == S_TRISTATE && *value != 'n')
 613                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 614 }
 615
 616 static struct conf_printer tristate_printer_cb =
 617 {
 618         .print_symbol = tristate_print_symbol,
 619         .print_comment = kconfig_print_comment,
 620 };
 621
 622 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 623                               struct conf_printer *printer, void *printer_arg)
 624 {
 625         const char *str;
 626
 627         switch (sym->type) {
 628         case S_OTHER:
 629         case S_UNKNOWN:
 630                 break;
 631         case S_STRING:
 632                 str = sym_get_string_value(sym);
 633                 str = sym_escape_string_value(str);
 634                 printer->print_symbol(fp, sym, str, printer_arg);
 635                 free((void *)str);
 636                 break;
 637         default:
 638                 str = sym_get_string_value(sym);
 639                 printer->print_symbol(fp, sym, str, printer_arg);
 640         }
 641 }
 642
 643 static void
 644 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 645 {
 646         char buf[256];
 647
 648         snprintf(buf, sizeof(buf),
 649             "\n"
 650             "Automatically generated file; DO NOT EDIT.\n"
 651             "%s\n",
 652             rootmenu.prompt->text);
 653
 654         printer->print_comment(fp, buf, printer_arg);
 655 }
 656
 657 /*
 658  * Write out a minimal config.
 659  * All values that has default values are skipped as this is redundant.
 660  */
 661 int conf_write_defconfig(const char *filename)
 662 {
 663         struct symbol *sym;
 664         struct menu *menu;
 665         FILE *out;
 666
 667         out = fopen(filename, "w");
 668         if (!out)
 669                 return 1;
 670
 671         sym_clear_all_valid();
 672
 673         /* Traverse all menus to find all relevant symbols */
 674         menu = rootmenu.list;
 675
 676         while (menu != NULL)
 677         {
 678                 sym = menu->sym;
 679                 if (sym == NULL) {
 680                         if (!menu_is_visible(menu))
 681                                 goto next_menu;
 682                 } else if (!sym_is_choice(sym)) {
 683                         sym_calc_value(sym);
 684                         if (!(sym->flags & SYMBOL_WRITE))
 685                                 goto next_menu;
 686                         sym->flags &= ~SYMBOL_WRITE;
 687                         /* If we cannot change the symbol - skip */
 688                         if (!sym_is_changable(sym))
 689                                 goto next_menu;
 690                         /* If symbol equals to default value - skip */
 691                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 692                                 goto next_menu;
 693
 694                         /*
 695                          * If symbol is a choice value and equals to the
 696                          * default for a choice - skip.
 697                          * But only if value is bool and equal to "y" and
 698                          * choice is not "optional".
 699                          * (If choice is "optional" then all values can be "n")
 700                          */
 701                         if (sym_is_choice_value(sym)) {
 702                                 struct symbol *cs;
 703                                 struct symbol *ds;
 704
 705                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 706                                 ds = sym_choice_default(cs);
 707                                 if (!sym_is_optional(cs) && sym == ds) {
 708                                         if ((sym->type == S_BOOLEAN) &&
 709                                             sym_get_tristate_value(sym) == yes)
 710                                                 goto next_menu;
 711                                 }
 712                         }
 713                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 714                 }
 715 next_menu:
 716                 if (menu->list != NULL) {
 717                         menu = menu->list;
 718                 }
 719                 else if (menu->next != NULL) {
 720                         menu = menu->next;
 721                 } else {
 722                         while ((menu = menu->parent)) {
 723                                 if (menu->next != NULL) {
 724                                         menu = menu->next;
 725                                         break;
 726                                 }
 727                         }
 728                 }
 729         }
 730         fclose(out);
 731         return 0;
 732 }
 733
 734 int conf_write(const char *name)
 735 {
 736         FILE *out;
 737         struct symbol *sym;
 738         struct menu *menu;
 739         const char *basename;
 740         const char *str;
 741         char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 742         char *env;
 743
 744         if (!name)
 745                 name = conf_get_configname();
 746
 747         dirname[0] = 0;
 748         if (name && name[0]) {
 749                 struct stat st;
 750                 char *slash;
 751
 752                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 753                         strcpy(dirname, name);
 754                         strcat(dirname, "/");
 755                         basename = conf_get_configname();
 756                 } else if ((slash = strrchr(name, '/'))) {
 757                         int size = slash - name + 1;
 758                         memcpy(dirname, name, size);
 759                         dirname[size] = 0;
 760                         if (slash[1])
 761                                 basename = slash + 1;
 762                         else
 763                                 basename = conf_get_configname();
 764                 } else
 765                         basename = name;
 766         } else
 767                 basename = conf_get_configname();
 768
 769         sprintf(newname, "%s%s", dirname, basename);
 770         env = getenv("KCONFIG_OVERWRITECONFIG");
 771         if (!env || !*env) {
 772                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 773                 out = fopen(tmpname, "w");
 774         } else {
 775                 *tmpname = 0;
 776                 out = fopen(newname, "w");
 777         }
 778         if (!out)
 779                 return 1;
 780
 781         conf_write_heading(out, &kconfig_printer_cb, NULL);
 782
 783         if (!conf_get_changed())
 784                 sym_clear_all_valid();
 785
 786         menu = rootmenu.list;
 787         while (menu) {
 788                 sym = menu->sym;
 789                 if (!sym) {
 790                         if (!menu_is_visible(menu))
 791                                 goto next;
 792                         str = menu_get_prompt(menu);
 793                         fprintf(out, "\n"
 794                                      "#\n"
 795                                      "# %s\n"
 796                                      "#\n", str);
 797                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 798                         sym_calc_value(sym);
 799                         if (!(sym->flags & SYMBOL_WRITE))
 800                                 goto next;
 801                         sym->flags &= ~SYMBOL_WRITE;
 802
 803                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 804                 }
 805
 806 next:
 807                 if (menu->list) {
 808                         menu = menu->list;
 809                         continue;
 810                 }
 811                 if (menu->next)
 812                         menu = menu->next;
 813                 else while ((menu = menu->parent)) {
 814                         if (menu->next) {
 815                                 menu = menu->next;
 816                                 break;
 817                         }
 818                 }
 819         }
 820         fclose(out);
 821
 822         if (*tmpname) {
 823                 strcat(dirname, basename);
 824                 strcat(dirname, ".old");
 825                 rename(newname, dirname);
 826                 if (rename(tmpname, newname))
 827                         return 1;
 828         }
 829
 830         conf_message(_("configuration written to %s"), newname);
 831
 832         sym_set_change_count(0);
 833
 834         return 0;
 835 }
 836
 837 static int conf_split_config(void)
 838 {
 839         const char *name;
 840         char path[PATH_MAX+1];
 841         char *opwd, *dir, *_name;
 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         opwd = malloc(256);
 851         _name = strdup(name);
 852         if (opwd == NULL || _name == NULL)
 853                 return 1;
 854         opwd = getcwd(opwd, 256);
 855         dir = dirname(_name);
 856         if (dir == NULL) {
 857                 res = 1;
 858                 goto err;
 859         }
 860         if (chdir(dir)) {
 861                 res = 1;
 862                 goto err;
 863         }
 864
 865         res = 0;
 866         for_all_symbols(i, sym) {
 867                 sym_calc_value(sym);
 868                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 869                         continue;
 870                 if (sym->flags & SYMBOL_WRITE) {
 871                         if (sym->flags & SYMBOL_DEF_AUTO) {
 872                                 /*
 873                                  * symbol has old and new value,
 874                                  * so compare them...
 875                                  */
 876                                 switch (sym->type) {
 877                                 case S_BOOLEAN:
 878                                 case S_TRISTATE:
 879                                         if (sym_get_tristate_value(sym) ==
 880                                             sym->def[S_DEF_AUTO].tri)
 881                                                 continue;
 882                                         break;
 883                                 case S_STRING:
 884                                 case S_HEX:
 885                                 case S_INT:
 886                                         if (!strcmp(sym_get_string_value(sym),
 887                                                     sym->def[S_DEF_AUTO].val))
 888                                                 continue;
 889                                         break;
 890                                 default:
 891                                         break;
 892                                 }
 893                         } else {
 894                                 /*
 895                                  * If there is no old value, only 'no' (unset)
 896                                  * is allowed as new value.
 897                                  */
 898                                 switch (sym->type) {
 899                                 case S_BOOLEAN:
 900                                 case S_TRISTATE:
 901                                         if (sym_get_tristate_value(sym) == no)
 902                                                 continue;
 903                                         break;
 904                                 default:
 905                                         break;
 906                                 }
 907                         }
 908                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 909                         /* There is neither an old nor a new value. */
 910                         continue;
 911                 /* else
 912                  *      There is an old value, but no new value ('no' (unset)
 913                  *      isn't saved in auto.conf, so the old value is always
 914                  *      different from 'no').
 915                  */
 916
 917                 /* Replace all '_' and append ".h" */
 918                 s = sym->name;
 919                 d = path;
 920                 while ((c = *s++)) {
 921                         c = tolower(c);
 922                         *d++ = (c == '_') ? '/' : c;
 923                 }
 924                 strcpy(d, ".h");
 925
 926                 /* Assume directory path already exists. */
 927                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 928                 if (fd == -1) {
 929                         if (errno != ENOENT) {
 930                                 res = 1;
 931                                 break;
 932                         }
 933                         /*
 934                          * Create directory components,
 935                          * unless they exist already.
 936                          */
 937                         d = path;
 938                         while ((d = strchr(d, '/'))) {
 939                                 *d = 0;
 940                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 941                                         res = 1;
 942                                         goto out;
 943                                 }
 944                                 *d++ = '/';
 945                         }
 946                         /* Try it again. */
 947                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 948                         if (fd == -1) {
 949                                 res = 1;
 950                                 break;
 951                         }
 952                 }
 953                 close(fd);
 954         }
 955 out:
 956         if (chdir(opwd))
 957                 res = 1;
 958 err:
 959         free(opwd);
 960         free(_name);
 961         return res;
 962 }
 963
 964 int conf_write_autoconf(void)
 965 {
 966         struct symbol *sym;
 967         const char *name;
 968         FILE *out, *tristate, *out_h;
 969         int i;
 970         char dir[PATH_MAX+1], buf[PATH_MAX+1];
 971         char *s;
 972
 973         strcpy(dir, conf_get_configname());
 974         s = strrchr(dir, '/');
 975         if (s)
 976                 s[1] = 0;
 977         else
 978                 dir[0] = 0;
 979
 980         sym_clear_all_valid();
 981
 982         sprintf(buf, "%s.config.cmd", dir);
 983         file_write_dep(buf);
 984
 985         if (conf_split_config())
 986                 return 1;
 987
 988         sprintf(buf, "%s.tmpconfig", dir);
 989         out = fopen(buf, "w");
 990         if (!out)
 991                 return 1;
 992
 993         sprintf(buf, "%s.tmpconfig_tristate", dir);
 994         tristate = fopen(buf, "w");
 995         if (!tristate) {
 996                 fclose(out);
 997                 return 1;
 998         }
 999
1000         sprintf(buf, "%s.tmpconfig.h", dir);
1001         out_h = fopen(buf, "w");
1002         if (!out_h) {
1003                 fclose(out);
1004                 fclose(tristate);
1005                 return 1;
1006         }
1007
1008         conf_write_heading(out, &kconfig_printer_cb, NULL);
1009
1010         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1011
1012         conf_write_heading(out_h, &header_printer_cb, NULL);
1013
1014         for_all_symbols(i, sym) {
1015                 sym_calc_value(sym);
1016                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1017                         continue;
1018
1019                 /* write symbol to auto.conf, tristate and header files */
1020                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1021
1022                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1023
1024                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1025         }
1026         fclose(out);
1027         fclose(tristate);
1028         fclose(out_h);
1029
1030         name = getenv("KCONFIG_AUTOHEADER");
1031         if (!name)
1032                 name = "include/generated/autoconf.h";
1033         sprintf(buf, "%s.tmpconfig.h", dir);
1034         if (rename(buf, name))
1035                 return 1;
1036         name = getenv("KCONFIG_TRISTATE");
1037         if (!name)
1038                 name = "include/config/tristate.conf";
1039         sprintf(buf, "%s.tmpconfig_tristate", dir);
1040         if (rename(buf, name))
1041                 return 1;
1042         name = conf_get_autoconfig_name();
1043         /*
1044          * This must be the last step, kbuild has a dependency on auto.conf
1045          * and this marks the successful completion of the previous steps.
1046          */
1047         sprintf(buf, "%s.tmpconfig", dir);
1048         if (rename(buf, name))
1049                 return 1;
1050
1051         return 0;
1052 }
1053
1054 static int sym_change_count;
1055 static void (*conf_changed_callback)(void);
1056
1057 void sym_set_change_count(int count)
1058 {
1059         int _sym_change_count = sym_change_count;
1060         sym_change_count = count;
1061         if (conf_changed_callback &&
1062             (bool)_sym_change_count != (bool)count)
1063                 conf_changed_callback();
1064 }
1065
1066 void sym_add_change_count(int count)
1067 {
1068         sym_set_change_count(count + sym_change_count);
1069 }
1070
1071 bool conf_get_changed(void)
1072 {
1073         return sym_change_count;
1074 }
1075
1076 void conf_set_changed_callback(void (*fn)(void))
1077 {
1078         conf_changed_callback = fn;
1079 }
1080
1081 static bool randomize_choice_values(struct symbol *csym)
1082 {
1083         struct property *prop;
1084         struct symbol *sym;
1085         struct expr *e;
1086         int cnt, def;
1087
1088         /*
1089          * If choice is mod then we may have more items selected
1090          * and if no then no-one.
1091          * In both cases stop.
1092          */
1093         if (csym->curr.tri != yes)
1094                 return false;
1095
1096         prop = sym_get_choice_prop(csym);
1097
1098         /* count entries in choice block */
1099         cnt = 0;
1100         expr_list_for_each_sym(prop->expr, e, sym)
1101                 cnt++;
1102
1103         /*
1104          * find a random value and set it to yes,
1105          * set the rest to no so we have only one set
1106          */
1107         def = (rand() % cnt);
1108
1109         cnt = 0;
1110         expr_list_for_each_sym(prop->expr, e, sym) {
1111                 if (def == cnt++) {
1112                         sym->def[S_DEF_USER].tri = yes;
1113                         csym->def[S_DEF_USER].val = sym;
1114                 }
1115                 else {
1116                         sym->def[S_DEF_USER].tri = no;
1117                 }
1118                 sym->flags |= SYMBOL_DEF_USER;
1119                 /* clear VALID to get value calculated */
1120                 sym->flags &= ~SYMBOL_VALID;
1121         }
1122         csym->flags |= SYMBOL_DEF_USER;
1123         /* clear VALID to get value calculated */
1124         csym->flags &= ~(SYMBOL_VALID);
1125
1126         return true;
1127 }
1128
1129 void set_all_choice_values(struct symbol *csym)
1130 {
1131         struct property *prop;
1132         struct symbol *sym;
1133         struct expr *e;
1134
1135         prop = sym_get_choice_prop(csym);
1136
1137         /*
1138          * Set all non-assinged choice values to no
1139          */
1140         expr_list_for_each_sym(prop->expr, e, sym) {
1141                 if (!sym_has_value(sym))
1142                         sym->def[S_DEF_USER].tri = no;
1143         }
1144         csym->flags |= SYMBOL_DEF_USER;
1145         /* clear VALID to get value calculated */
1146         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1147 }
1148
1149 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1150 {
1151         struct symbol *sym, *csym;
1152         int i, cnt, pby, pty, ptm;      /* pby: probability of boolean  = y
1153                                          * pty: probability of tristate = y
1154                                          * ptm: probability of tristate = m
1155                                          */
1156
1157         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1158                                    * below, otherwise gcc whines about
1159                                    * -Wmaybe-uninitialized */
1160         if (mode == def_random) {
1161                 int n, p[3];
1162                 char *env = getenv("KCONFIG_PROBABILITY");
1163                 n = 0;
1164                 while( env && *env ) {
1165                         char *endp;
1166                         int tmp = strtol( env, &endp, 10 );
1167                         if( tmp >= 0 && tmp <= 100 ) {
1168                                 p[n++] = tmp;
1169                         } else {
1170                                 errno = ERANGE;
1171                                 perror( "KCONFIG_PROBABILITY" );
1172                                 exit( 1 );
1173                         }
1174                         env = (*endp == ':') ? endp+1 : endp;
1175                         if( n >=3 ) {
1176                                 break;
1177                         }
1178                 }
1179                 switch( n ) {
1180                 case 1:
1181                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1182                         break;
1183                 case 2:
1184                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1185                         break;
1186                 case 3:
1187                         pby = p[0]; pty = p[1]; ptm = p[2];
1188                         break;
1189                 }
1190
1191                 if( pty+ptm > 100 ) {
1192                         errno = ERANGE;
1193                         perror( "KCONFIG_PROBABILITY" );
1194                         exit( 1 );
1195                 }
1196         }
1197         bool has_changed = false;
1198
1199         for_all_symbols(i, sym) {
1200                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1201                         continue;
1202                 switch (sym_get_type(sym)) {
1203                 case S_BOOLEAN:
1204                 case S_TRISTATE:
1205                         has_changed = true;
1206                         switch (mode) {
1207                         case def_yes:
1208                                 sym->def[S_DEF_USER].tri = yes;
1209                                 break;
1210                         case def_mod:
1211                                 sym->def[S_DEF_USER].tri = mod;
1212                                 break;
1213                         case def_no:
1214                                 sym->def[S_DEF_USER].tri = no;
1215                                 break;
1216                         case def_random:
1217                                 sym->def[S_DEF_USER].tri = no;
1218                                 cnt = rand() % 100;
1219                                 if (sym->type == S_TRISTATE) {
1220                                         if (cnt < pty)
1221                                                 sym->def[S_DEF_USER].tri = yes;
1222                                         else if (cnt < (pty+ptm))
1223                                                 sym->def[S_DEF_USER].tri = mod;
1224                                 } else if (cnt < pby)
1225                                         sym->def[S_DEF_USER].tri = yes;
1226                                 break;
1227                         default:
1228                                 continue;
1229                         }
1230                         if (!(sym_is_choice(sym) && mode == def_random))
1231                                 sym->flags |= SYMBOL_DEF_USER;
1232                         break;
1233                 default:
1234                         break;
1235                 }
1236
1237         }
1238
1239         sym_clear_all_valid();
1240
1241         /*
1242          * We have different type of choice blocks.
1243          * If curr.tri equals to mod then we can select several
1244          * choice symbols in one block.
1245          * In this case we do nothing.
1246          * If curr.tri equals yes then only one symbol can be
1247          * selected in a choice block and we set it to yes,
1248          * and the rest to no.
1249          */
1250         if (mode != def_random) {
1251                 for_all_symbols(i, csym) {
1252                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1253                             sym_is_choice_value(csym))
1254                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1255                 }
1256         }
1257
1258         for_all_symbols(i, csym) {
1259                 if (sym_has_value(csym) || !sym_is_choice(csym))
1260                         continue;
1261
1262                 sym_calc_value(csym);
1263                 if (mode == def_random)
1264                         has_changed = randomize_choice_values(csym);
1265                 else {
1266                         set_all_choice_values(csym);
1267                         has_changed = true;
1268                 }
1269         }
1270
1271         return has_changed;
1272 }