scripts/kconfig/confdata.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   4  */
   5
   6 #include <sys/mman.h>
   7 #include <sys/stat.h>
   8 #include <ctype.h>
   9 #include <errno.h>
  10 #include <fcntl.h>
  11 #include <limits.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <time.h>
  17 #include <unistd.h>
  18
  19 #include "lkc.h"
  20
  21 /* return true if 'path' exists, false otherwise */
  22 static bool is_present(const char *path)
  23 {
  24         struct stat st;
  25
  26         return !stat(path, &st);
  27 }
  28
  29 /* return true if 'path' exists and it is a directory, false otherwise */
  30 static bool is_dir(const char *path)
  31 {
  32         struct stat st;
  33
  34         if (stat(path, &st))
  35                 return 0;
  36
  37         return S_ISDIR(st.st_mode);
  38 }
  39
  40 /* return true if the given two files are the same, false otherwise */
  41 static bool is_same(const char *file1, const char *file2)
  42 {
  43         int fd1, fd2;
  44         struct stat st1, st2;
  45         void *map1, *map2;
  46         bool ret = false;
  47
  48         fd1 = open(file1, O_RDONLY);
  49         if (fd1 < 0)
  50                 return ret;
  51
  52         fd2 = open(file2, O_RDONLY);
  53         if (fd2 < 0)
  54                 goto close1;
  55
  56         ret = fstat(fd1, &st1);
  57         if (ret)
  58                 goto close2;
  59         ret = fstat(fd2, &st2);
  60         if (ret)
  61                 goto close2;
  62
  63         if (st1.st_size != st2.st_size)
  64                 goto close2;
  65
  66         map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
  67         if (map1 == MAP_FAILED)
  68                 goto close2;
  69
  70         map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
  71         if (map2 == MAP_FAILED)
  72                 goto close2;
  73
  74         if (bcmp(map1, map2, st1.st_size))
  75                 goto close2;
  76
  77         ret = true;
  78 close2:
  79         close(fd2);
  80 close1:
  81         close(fd1);
  82
  83         return ret;
  84 }
  85
  86 /*
  87  * Create the parent directory of the given path.
  88  *
  89  * For example, if 'include/config/auto.conf' is given, create 'include/config'.
  90  */
  91 static int make_parent_dir(const char *path)
  92 {
  93         char tmp[PATH_MAX + 1];
  94         char *p;
  95
  96         strncpy(tmp, path, sizeof(tmp));
  97         tmp[sizeof(tmp) - 1] = 0;
  98
  99         /* Remove the base name. Just return if nothing is left */
 100         p = strrchr(tmp, '/');
 101         if (!p)
 102                 return 0;
 103         *(p + 1) = 0;
 104
 105         /* Just in case it is an absolute path */
 106         p = tmp;
 107         while (*p == '/')
 108                 p++;
 109
 110         while ((p = strchr(p, '/'))) {
 111                 *p = 0;
 112
 113                 /* skip if the directory exists */
 114                 if (!is_dir(tmp) && mkdir(tmp, 0755))
 115                         return -1;
 116
 117                 *p = '/';
 118                 while (*p == '/')
 119                         p++;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static char depfile_path[PATH_MAX];
 126 static size_t depfile_prefix_len;
 127
 128 /* touch depfile for symbol 'name' */
 129 static int conf_touch_dep(const char *name)
 130 {
 131         int fd, ret;
 132         const char *s;
 133         char *d, c;
 134
 135         /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
 136         if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
 137                 return -1;
 138
 139         d = depfile_path + depfile_prefix_len;
 140         s = name;
 141
 142         while ((c = *s++))
 143                 *d++ = (c == '_') ? '/' : tolower(c);
 144         strcpy(d, ".h");
 145
 146         /* Assume directory path already exists. */
 147         fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 148         if (fd == -1) {
 149                 if (errno != ENOENT)
 150                         return -1;
 151
 152                 ret = make_parent_dir(depfile_path);
 153                 if (ret)
 154                         return ret;
 155
 156                 /* Try it again. */
 157                 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 158                 if (fd == -1)
 159                         return -1;
 160         }
 161         close(fd);
 162
 163         return 0;
 164 }
 165
 166 struct conf_printer {
 167         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
 168         void (*print_comment)(FILE *, const char *, void *);
 169 };
 170
 171 static void conf_warning(const char *fmt, ...)
 172         __attribute__ ((format (printf, 1, 2)));
 173
 174 static void conf_message(const char *fmt, ...)
 175         __attribute__ ((format (printf, 1, 2)));
 176
 177 static const char *conf_filename;
 178 static int conf_lineno, conf_warnings;
 179
 180 static void conf_warning(const char *fmt, ...)
 181 {
 182         va_list ap;
 183         va_start(ap, fmt);
 184         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
 185         vfprintf(stderr, fmt, ap);
 186         fprintf(stderr, "\n");
 187         va_end(ap);
 188         conf_warnings++;
 189 }
 190
 191 static void conf_default_message_callback(const char *s)
 192 {
 193         printf("#\n# ");
 194         printf("%s", s);
 195         printf("\n#\n");
 196 }
 197
 198 static void (*conf_message_callback)(const char *s) =
 199         conf_default_message_callback;
 200 void conf_set_message_callback(void (*fn)(const char *s))
 201 {
 202         conf_message_callback = fn;
 203 }
 204
 205 static void conf_message(const char *fmt, ...)
 206 {
 207         va_list ap;
 208         char buf[4096];
 209
 210         if (!conf_message_callback)
 211                 return;
 212
 213         va_start(ap, fmt);
 214
 215         vsnprintf(buf, sizeof(buf), fmt, ap);
 216         conf_message_callback(buf);
 217         va_end(ap);
 218 }
 219
 220 const char *conf_get_configname(void)
 221 {
 222         char *name = getenv("KCONFIG_CONFIG");
 223
 224         return name ? name : ".config";
 225 }
 226
 227 static const char *conf_get_autoconfig_name(void)
 228 {
 229         char *name = getenv("KCONFIG_AUTOCONFIG");
 230
 231         return name ? name : "include/config/auto.conf";
 232 }
 233
 234 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 235 {
 236         char *p2;
 237
 238         switch (sym->type) {
 239         case S_TRISTATE:
 240                 if (p[0] == 'm') {
 241                         sym->def[def].tri = mod;
 242                         sym->flags |= def_flags;
 243                         break;
 244                 }
 245                 /* fall through */
 246         case S_BOOLEAN:
 247                 if (p[0] == 'y') {
 248                         sym->def[def].tri = yes;
 249                         sym->flags |= def_flags;
 250                         break;
 251                 }
 252                 if (p[0] == 'n') {
 253                         sym->def[def].tri = no;
 254                         sym->flags |= def_flags;
 255                         break;
 256                 }
 257                 if (def != S_DEF_AUTO)
 258                         conf_warning("symbol value '%s' invalid for %s",
 259                                      p, sym->name);
 260                 return 1;
 261         case S_STRING:
 262                 if (*p++ != '"')
 263                         break;
 264                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 265                         if (*p2 == '"') {
 266                                 *p2 = 0;
 267                                 break;
 268                         }
 269                         memmove(p2, p2 + 1, strlen(p2));
 270                 }
 271                 if (!p2) {
 272                         if (def != S_DEF_AUTO)
 273                                 conf_warning("invalid string found");
 274                         return 1;
 275                 }
 276                 /* fall through */
 277         case S_INT:
 278         case S_HEX:
 279                 if (sym_string_valid(sym, p)) {
 280                         sym->def[def].val = xstrdup(p);
 281                         sym->flags |= def_flags;
 282                 } else {
 283                         if (def != S_DEF_AUTO)
 284                                 conf_warning("symbol value '%s' invalid for %s",
 285                                              p, sym->name);
 286                         return 1;
 287                 }
 288                 break;
 289         default:
 290                 ;
 291         }
 292         return 0;
 293 }
 294
 295 #define LINE_GROWTH 16
 296 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 297 {
 298         char *nline;
 299         size_t new_size = slen + 1;
 300         if (new_size > *n) {
 301                 new_size += LINE_GROWTH - 1;
 302                 new_size *= 2;
 303                 nline = xrealloc(*lineptr, new_size);
 304                 if (!nline)
 305                         return -1;
 306
 307                 *lineptr = nline;
 308                 *n = new_size;
 309         }
 310
 311         (*lineptr)[slen] = c;
 312
 313         return 0;
 314 }
 315
 316 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 317 {
 318         char *line = *lineptr;
 319         size_t slen = 0;
 320
 321         for (;;) {
 322                 int c = getc(stream);
 323
 324                 switch (c) {
 325                 case '\n':
 326                         if (add_byte(c, &line, slen, n) < 0)
 327                                 goto e_out;
 328                         slen++;
 329                         /* fall through */
 330                 case EOF:
 331                         if (add_byte('\0', &line, slen, n) < 0)
 332                                 goto e_out;
 333                         *lineptr = line;
 334                         if (slen == 0)
 335                                 return -1;
 336                         return slen;
 337                 default:
 338                         if (add_byte(c, &line, slen, n) < 0)
 339                                 goto e_out;
 340                         slen++;
 341                 }
 342         }
 343
 344 e_out:
 345         line[slen-1] = '\0';
 346         *lineptr = line;
 347         return -1;
 348 }
 349
 350 int conf_read_simple(const char *name, int def)
 351 {
 352         FILE *in = NULL;
 353         char   *line = NULL;
 354         size_t  line_asize = 0;
 355         char *p, *p2;
 356         struct symbol *sym;
 357         int i, def_flags;
 358
 359         if (name) {
 360                 in = zconf_fopen(name);
 361         } else {
 362                 struct property *prop;
 363
 364                 name = conf_get_configname();
 365                 in = zconf_fopen(name);
 366                 if (in)
 367                         goto load;
 368                 sym_add_change_count(1);
 369                 if (!sym_defconfig_list)
 370                         return 1;
 371
 372                 for_all_defaults(sym_defconfig_list, prop) {
 373                         if (expr_calc_value(prop->visible.expr) == no ||
 374                             prop->expr->type != E_SYMBOL)
 375                                 continue;
 376                         sym_calc_value(prop->expr->left.sym);
 377                         name = sym_get_string_value(prop->expr->left.sym);
 378                         in = zconf_fopen(name);
 379                         if (in) {
 380                                 conf_message("using defaults found in %s",
 381                                          name);
 382                                 goto load;
 383                         }
 384                 }
 385         }
 386         if (!in)
 387                 return 1;
 388
 389 load:
 390         conf_filename = name;
 391         conf_lineno = 0;
 392         conf_warnings = 0;
 393
 394         def_flags = SYMBOL_DEF << def;
 395         for_all_symbols(i, sym) {
 396                 sym->flags |= SYMBOL_CHANGED;
 397                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 398                 if (sym_is_choice(sym))
 399                         sym->flags |= def_flags;
 400                 switch (sym->type) {
 401                 case S_INT:
 402                 case S_HEX:
 403                 case S_STRING:
 404                         if (sym->def[def].val)
 405                                 free(sym->def[def].val);
 406                         /* fall through */
 407                 default:
 408                         sym->def[def].val = NULL;
 409                         sym->def[def].tri = no;
 410                 }
 411         }
 412
 413         while (compat_getline(&line, &line_asize, in) != -1) {
 414                 conf_lineno++;
 415                 sym = NULL;
 416                 if (line[0] == '#') {
 417                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 418                                 continue;
 419                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 420                         if (!p)
 421                                 continue;
 422                         *p++ = 0;
 423                         if (strncmp(p, "is not set", 10))
 424                                 continue;
 425                         if (def == S_DEF_USER) {
 426                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 427                                 if (!sym) {
 428                                         sym_add_change_count(1);
 429                                         continue;
 430                                 }
 431                         } else {
 432                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 433                                 if (sym->type == S_UNKNOWN)
 434                                         sym->type = S_BOOLEAN;
 435                         }
 436                         if (sym->flags & def_flags) {
 437                                 conf_warning("override: reassigning to symbol %s", sym->name);
 438                         }
 439                         switch (sym->type) {
 440                         case S_BOOLEAN:
 441                         case S_TRISTATE:
 442                                 sym->def[def].tri = no;
 443                                 sym->flags |= def_flags;
 444                                 break;
 445                         default:
 446                                 ;
 447                         }
 448                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 449                         p = strchr(line + strlen(CONFIG_), '=');
 450                         if (!p)
 451                                 continue;
 452                         *p++ = 0;
 453                         p2 = strchr(p, '\n');
 454                         if (p2) {
 455                                 *p2-- = 0;
 456                                 if (*p2 == '\r')
 457                                         *p2 = 0;
 458                         }
 459
 460                         sym = sym_find(line + strlen(CONFIG_));
 461                         if (!sym) {
 462                                 if (def == S_DEF_AUTO)
 463                                         /*
 464                                          * Reading from include/config/auto.conf
 465                                          * If CONFIG_FOO previously existed in
 466                                          * auto.conf but it is missing now,
 467                                          * include/config/foo.h must be touched.
 468                                          */
 469                                         conf_touch_dep(line + strlen(CONFIG_));
 470                                 else
 471                                         sym_add_change_count(1);
 472                                 continue;
 473                         }
 474
 475                         if (sym->flags & def_flags) {
 476                                 conf_warning("override: reassigning to symbol %s", sym->name);
 477                         }
 478                         if (conf_set_sym_val(sym, def, def_flags, p))
 479                                 continue;
 480                 } else {
 481                         if (line[0] != '\r' && line[0] != '\n')
 482                                 conf_warning("unexpected data: %.*s",
 483                                              (int)strcspn(line, "\r\n"), line);
 484
 485                         continue;
 486                 }
 487
 488                 if (sym && sym_is_choice_value(sym)) {
 489                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 490                         switch (sym->def[def].tri) {
 491                         case no:
 492                                 break;
 493                         case mod:
 494                                 if (cs->def[def].tri == yes) {
 495                                         conf_warning("%s creates inconsistent choice state", sym->name);
 496                                         cs->flags &= ~def_flags;
 497                                 }
 498                                 break;
 499                         case yes:
 500                                 if (cs->def[def].tri != no)
 501                                         conf_warning("override: %s changes choice state", sym->name);
 502                                 cs->def[def].val = sym;
 503                                 break;
 504                         }
 505                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 506                 }
 507         }
 508         free(line);
 509         fclose(in);
 510         return 0;
 511 }
 512
 513 int conf_read(const char *name)
 514 {
 515         struct symbol *sym;
 516         int conf_unsaved = 0;
 517         int i;
 518
 519         sym_set_change_count(0);
 520
 521         if (conf_read_simple(name, S_DEF_USER)) {
 522                 sym_calc_value(modules_sym);
 523                 return 1;
 524         }
 525
 526         sym_calc_value(modules_sym);
 527
 528         for_all_symbols(i, sym) {
 529                 sym_calc_value(sym);
 530                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 531                         continue;
 532                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 533                         /* check that calculated value agrees with saved value */
 534                         switch (sym->type) {
 535                         case S_BOOLEAN:
 536                         case S_TRISTATE:
 537                                 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
 538                                         continue;
 539                                 break;
 540                         default:
 541                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 542                                         continue;
 543                                 break;
 544                         }
 545                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 546                         /* no previous value and not saved */
 547                         continue;
 548                 conf_unsaved++;
 549                 /* maybe print value in verbose mode... */
 550         }
 551
 552         for_all_symbols(i, sym) {
 553                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 554                         /* Reset values of generates values, so they'll appear
 555                          * as new, if they should become visible, but that
 556                          * doesn't quite work if the Kconfig and the saved
 557                          * configuration disagree.
 558                          */
 559                         if (sym->visible == no && !conf_unsaved)
 560                                 sym->flags &= ~SYMBOL_DEF_USER;
 561                         switch (sym->type) {
 562                         case S_STRING:
 563                         case S_INT:
 564                         case S_HEX:
 565                                 /* Reset a string value if it's out of range */
 566                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 567                                         break;
 568                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 569                                 conf_unsaved++;
 570                                 break;
 571                         default:
 572                                 break;
 573                         }
 574                 }
 575         }
 576
 577         sym_add_change_count(conf_warnings || conf_unsaved);
 578
 579         return 0;
 580 }
 581
 582 /*
 583  * Kconfig configuration printer
 584  *
 585  * This printer is used when generating the resulting configuration after
 586  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 587  * passing a non-NULL argument to the printer.
 588  *
 589  */
 590 static void
 591 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 592 {
 593
 594         switch (sym->type) {
 595         case S_BOOLEAN:
 596         case S_TRISTATE:
 597                 if (*value == 'n') {
 598                         bool skip_unset = (arg != NULL);
 599
 600                         if (!skip_unset)
 601                                 fprintf(fp, "# %s%s is not set\n",
 602                                     CONFIG_, sym->name);
 603                         return;
 604                 }
 605                 break;
 606         default:
 607                 break;
 608         }
 609
 610         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 611 }
 612
 613 static void
 614 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 615 {
 616         const char *p = value;
 617         size_t l;
 618
 619         for (;;) {
 620                 l = strcspn(p, "\n");
 621                 fprintf(fp, "#");
 622                 if (l) {
 623                         fprintf(fp, " ");
 624                         xfwrite(p, l, 1, fp);
 625                         p += l;
 626                 }
 627                 fprintf(fp, "\n");
 628                 if (*p++ == '\0')
 629                         break;
 630         }
 631 }
 632
 633 static struct conf_printer kconfig_printer_cb =
 634 {
 635         .print_symbol = kconfig_print_symbol,
 636         .print_comment = kconfig_print_comment,
 637 };
 638
 639 /*
 640  * Header printer
 641  *
 642  * This printer is used when generating the `include/generated/autoconf.h' file.
 643  */
 644 static void
 645 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 646 {
 647
 648         switch (sym->type) {
 649         case S_BOOLEAN:
 650         case S_TRISTATE: {
 651                 const char *suffix = "";
 652
 653                 switch (*value) {
 654                 case 'n':
 655                         break;
 656                 case 'm':
 657                         suffix = "_MODULE";
 658                         /* fall through */
 659                 default:
 660                         fprintf(fp, "#define %s%s%s 1\n",
 661                             CONFIG_, sym->name, suffix);
 662                 }
 663                 break;
 664         }
 665         case S_HEX: {
 666                 const char *prefix = "";
 667
 668                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 669                         prefix = "0x";
 670                 fprintf(fp, "#define %s%s %s%s\n",
 671                     CONFIG_, sym->name, prefix, value);
 672                 break;
 673         }
 674         case S_STRING:
 675         case S_INT:
 676                 fprintf(fp, "#define %s%s %s\n",
 677                     CONFIG_, sym->name, value);
 678                 break;
 679         default:
 680                 break;
 681         }
 682
 683 }
 684
 685 static void
 686 header_print_comment(FILE *fp, const char *value, void *arg)
 687 {
 688         const char *p = value;
 689         size_t l;
 690
 691         fprintf(fp, "/*\n");
 692         for (;;) {
 693                 l = strcspn(p, "\n");
 694                 fprintf(fp, " *");
 695                 if (l) {
 696                         fprintf(fp, " ");
 697                         xfwrite(p, l, 1, fp);
 698                         p += l;
 699                 }
 700                 fprintf(fp, "\n");
 701                 if (*p++ == '\0')
 702                         break;
 703         }
 704         fprintf(fp, " */\n");
 705 }
 706
 707 static struct conf_printer header_printer_cb =
 708 {
 709         .print_symbol = header_print_symbol,
 710         .print_comment = header_print_comment,
 711 };
 712
 713 /*
 714  * Tristate printer
 715  *
 716  * This printer is used when generating the `include/config/tristate.conf' file.
 717  */
 718 static void
 719 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 720 {
 721
 722         if (sym->type == S_TRISTATE && *value != 'n')
 723                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 724 }
 725
 726 static struct conf_printer tristate_printer_cb =
 727 {
 728         .print_symbol = tristate_print_symbol,
 729         .print_comment = kconfig_print_comment,
 730 };
 731
 732 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 733                               struct conf_printer *printer, void *printer_arg)
 734 {
 735         const char *str;
 736
 737         switch (sym->type) {
 738         case S_UNKNOWN:
 739                 break;
 740         case S_STRING:
 741                 str = sym_get_string_value(sym);
 742                 str = sym_escape_string_value(str);
 743                 printer->print_symbol(fp, sym, str, printer_arg);
 744                 free((void *)str);
 745                 break;
 746         default:
 747                 str = sym_get_string_value(sym);
 748                 printer->print_symbol(fp, sym, str, printer_arg);
 749         }
 750 }
 751
 752 static void
 753 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 754 {
 755         char buf[256];
 756
 757         snprintf(buf, sizeof(buf),
 758             "\n"
 759             "Automatically generated file; DO NOT EDIT.\n"
 760             "%s\n",
 761             rootmenu.prompt->text);
 762
 763         printer->print_comment(fp, buf, printer_arg);
 764 }
 765
 766 /*
 767  * Write out a minimal config.
 768  * All values that has default values are skipped as this is redundant.
 769  */
 770 int conf_write_defconfig(const char *filename)
 771 {
 772         struct symbol *sym;
 773         struct menu *menu;
 774         FILE *out;
 775
 776         out = fopen(filename, "w");
 777         if (!out)
 778                 return 1;
 779
 780         sym_clear_all_valid();
 781
 782         /* Traverse all menus to find all relevant symbols */
 783         menu = rootmenu.list;
 784
 785         while (menu != NULL)
 786         {
 787                 sym = menu->sym;
 788                 if (sym == NULL) {
 789                         if (!menu_is_visible(menu))
 790                                 goto next_menu;
 791                 } else if (!sym_is_choice(sym)) {
 792                         sym_calc_value(sym);
 793                         if (!(sym->flags & SYMBOL_WRITE))
 794                                 goto next_menu;
 795                         sym->flags &= ~SYMBOL_WRITE;
 796                         /* If we cannot change the symbol - skip */
 797                         if (!sym_is_changeable(sym))
 798                                 goto next_menu;
 799                         /* If symbol equals to default value - skip */
 800                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 801                                 goto next_menu;
 802
 803                         /*
 804                          * If symbol is a choice value and equals to the
 805                          * default for a choice - skip.
 806                          * But only if value is bool and equal to "y" and
 807                          * choice is not "optional".
 808                          * (If choice is "optional" then all values can be "n")
 809                          */
 810                         if (sym_is_choice_value(sym)) {
 811                                 struct symbol *cs;
 812                                 struct symbol *ds;
 813
 814                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 815                                 ds = sym_choice_default(cs);
 816                                 if (!sym_is_optional(cs) && sym == ds) {
 817                                         if ((sym->type == S_BOOLEAN) &&
 818                                             sym_get_tristate_value(sym) == yes)
 819                                                 goto next_menu;
 820                                 }
 821                         }
 822                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 823                 }
 824 next_menu:
 825                 if (menu->list != NULL) {
 826                         menu = menu->list;
 827                 }
 828                 else if (menu->next != NULL) {
 829                         menu = menu->next;
 830                 } else {
 831                         while ((menu = menu->parent)) {
 832                                 if (menu->next != NULL) {
 833                                         menu = menu->next;
 834                                         break;
 835                                 }
 836                         }
 837                 }
 838         }
 839         fclose(out);
 840         return 0;
 841 }
 842
 843 int conf_write(const char *name)
 844 {
 845         FILE *out;
 846         struct symbol *sym;
 847         struct menu *menu;
 848         const char *str;
 849         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 850         char *env;
 851         int i;
 852         bool need_newline = false;
 853
 854         if (!name)
 855                 name = conf_get_configname();
 856
 857         if (!*name) {
 858                 fprintf(stderr, "config name is empty\n");
 859                 return -1;
 860         }
 861
 862         if (is_dir(name)) {
 863                 fprintf(stderr, "%s: Is a directory\n", name);
 864                 return -1;
 865         }
 866
 867         if (make_parent_dir(name))
 868                 return -1;
 869
 870         env = getenv("KCONFIG_OVERWRITECONFIG");
 871         if (env && *env) {
 872                 *tmpname = 0;
 873                 out = fopen(name, "w");
 874         } else {
 875                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 876                          name, (int)getpid());
 877                 out = fopen(tmpname, "w");
 878         }
 879         if (!out)
 880                 return 1;
 881
 882         conf_write_heading(out, &kconfig_printer_cb, NULL);
 883
 884         if (!conf_get_changed())
 885                 sym_clear_all_valid();
 886
 887         menu = rootmenu.list;
 888         while (menu) {
 889                 sym = menu->sym;
 890                 if (!sym) {
 891                         if (!menu_is_visible(menu))
 892                                 goto next;
 893                         str = menu_get_prompt(menu);
 894                         fprintf(out, "\n"
 895                                      "#\n"
 896                                      "# %s\n"
 897                                      "#\n", str);
 898                         need_newline = false;
 899                 } else if (!(sym->flags & SYMBOL_CHOICE) &&
 900                            !(sym->flags & SYMBOL_WRITTEN)) {
 901                         sym_calc_value(sym);
 902                         if (!(sym->flags & SYMBOL_WRITE))
 903                                 goto next;
 904                         if (need_newline) {
 905                                 fprintf(out, "\n");
 906                                 need_newline = false;
 907                         }
 908                         sym->flags |= SYMBOL_WRITTEN;
 909                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 910                 }
 911
 912 next:
 913                 if (menu->list) {
 914                         menu = menu->list;
 915                         continue;
 916                 }
 917                 if (menu->next)
 918                         menu = menu->next;
 919                 else while ((menu = menu->parent)) {
 920                         if (!menu->sym && menu_is_visible(menu) &&
 921                             menu != &rootmenu) {
 922                                 str = menu_get_prompt(menu);
 923                                 fprintf(out, "# end of %s\n", str);
 924                                 need_newline = true;
 925                         }
 926                         if (menu->next) {
 927                                 menu = menu->next;
 928                                 break;
 929                         }
 930                 }
 931         }
 932         fclose(out);
 933
 934         for_all_symbols(i, sym)
 935                 sym->flags &= ~SYMBOL_WRITTEN;
 936
 937         if (*tmpname) {
 938                 if (is_same(name, tmpname)) {
 939                         conf_message("No change to %s", name);
 940                         unlink(tmpname);
 941                         sym_set_change_count(0);
 942                         return 0;
 943                 }
 944
 945                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 946                 rename(name, oldname);
 947                 if (rename(tmpname, name))
 948                         return 1;
 949         }
 950
 951         conf_message("configuration written to %s", name);
 952
 953         sym_set_change_count(0);
 954
 955         return 0;
 956 }
 957
 958 /* write a dependency file as used by kbuild to track dependencies */
 959 static int conf_write_dep(const char *name)
 960 {
 961         struct file *file;
 962         FILE *out;
 963
 964         out = fopen("..config.tmp", "w");
 965         if (!out)
 966                 return 1;
 967         fprintf(out, "deps_config := \\\n");
 968         for (file = file_list; file; file = file->next) {
 969                 if (file->next)
 970                         fprintf(out, "\t%s \\\n", file->name);
 971                 else
 972                         fprintf(out, "\t%s\n", file->name);
 973         }
 974         fprintf(out, "\n%s: \\\n"
 975                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
 976
 977         env_write_dep(out, conf_get_autoconfig_name());
 978
 979         fprintf(out, "\n$(deps_config): ;\n");
 980         fclose(out);
 981
 982         if (make_parent_dir(name))
 983                 return 1;
 984         rename("..config.tmp", name);
 985         return 0;
 986 }
 987
 988 static int conf_touch_deps(void)
 989 {
 990         const char *name;
 991         struct symbol *sym;
 992         int res, i;
 993
 994         strcpy(depfile_path, "include/config/");
 995         depfile_prefix_len = strlen(depfile_path);
 996
 997         name = conf_get_autoconfig_name();
 998         conf_read_simple(name, S_DEF_AUTO);
 999         sym_calc_value(modules_sym);
1000
1001         for_all_symbols(i, sym) {
1002                 sym_calc_value(sym);
1003                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1004                         continue;
1005                 if (sym->flags & SYMBOL_WRITE) {
1006                         if (sym->flags & SYMBOL_DEF_AUTO) {
1007                                 /*
1008                                  * symbol has old and new value,
1009                                  * so compare them...
1010                                  */
1011                                 switch (sym->type) {
1012                                 case S_BOOLEAN:
1013                                 case S_TRISTATE:
1014                                         if (sym_get_tristate_value(sym) ==
1015                                             sym->def[S_DEF_AUTO].tri)
1016                                                 continue;
1017                                         break;
1018                                 case S_STRING:
1019                                 case S_HEX:
1020                                 case S_INT:
1021                                         if (!strcmp(sym_get_string_value(sym),
1022                                                     sym->def[S_DEF_AUTO].val))
1023                                                 continue;
1024                                         break;
1025                                 default:
1026                                         break;
1027                                 }
1028                         } else {
1029                                 /*
1030                                  * If there is no old value, only 'no' (unset)
1031                                  * is allowed as new value.
1032                                  */
1033                                 switch (sym->type) {
1034                                 case S_BOOLEAN:
1035                                 case S_TRISTATE:
1036                                         if (sym_get_tristate_value(sym) == no)
1037                                                 continue;
1038                                         break;
1039                                 default:
1040                                         break;
1041                                 }
1042                         }
1043                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1044                         /* There is neither an old nor a new value. */
1045                         continue;
1046                 /* else
1047                  *      There is an old value, but no new value ('no' (unset)
1048                  *      isn't saved in auto.conf, so the old value is always
1049                  *      different from 'no').
1050                  */
1051
1052                 res = conf_touch_dep(sym->name);
1053                 if (res)
1054                         return res;
1055         }
1056
1057         return 0;
1058 }
1059
1060 int conf_write_autoconf(int overwrite)
1061 {
1062         struct symbol *sym;
1063         const char *name;
1064         const char *autoconf_name = conf_get_autoconfig_name();
1065         FILE *out, *tristate, *out_h;
1066         int i;
1067
1068         if (!overwrite && is_present(autoconf_name))
1069                 return 0;
1070
1071         conf_write_dep("include/config/auto.conf.cmd");
1072
1073         if (conf_touch_deps())
1074                 return 1;
1075
1076         out = fopen(".tmpconfig", "w");
1077         if (!out)
1078                 return 1;
1079
1080         tristate = fopen(".tmpconfig_tristate", "w");
1081         if (!tristate) {
1082                 fclose(out);
1083                 return 1;
1084         }
1085
1086         out_h = fopen(".tmpconfig.h", "w");
1087         if (!out_h) {
1088                 fclose(out);
1089                 fclose(tristate);
1090                 return 1;
1091         }
1092
1093         conf_write_heading(out, &kconfig_printer_cb, NULL);
1094
1095         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1096
1097         conf_write_heading(out_h, &header_printer_cb, NULL);
1098
1099         for_all_symbols(i, sym) {
1100                 sym_calc_value(sym);
1101                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1102                         continue;
1103
1104                 /* write symbol to auto.conf, tristate and header files */
1105                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1106
1107                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1108
1109                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1110         }
1111         fclose(out);
1112         fclose(tristate);
1113         fclose(out_h);
1114
1115         name = getenv("KCONFIG_AUTOHEADER");
1116         if (!name)
1117                 name = "include/generated/autoconf.h";
1118         if (make_parent_dir(name))
1119                 return 1;
1120         if (rename(".tmpconfig.h", name))
1121                 return 1;
1122
1123         name = getenv("KCONFIG_TRISTATE");
1124         if (!name)
1125                 name = "include/config/tristate.conf";
1126         if (make_parent_dir(name))
1127                 return 1;
1128         if (rename(".tmpconfig_tristate", name))
1129                 return 1;
1130
1131         if (make_parent_dir(autoconf_name))
1132                 return 1;
1133         /*
1134          * This must be the last step, kbuild has a dependency on auto.conf
1135          * and this marks the successful completion of the previous steps.
1136          */
1137         if (rename(".tmpconfig", autoconf_name))
1138                 return 1;
1139
1140         return 0;
1141 }
1142
1143 static int sym_change_count;
1144 static void (*conf_changed_callback)(void);
1145
1146 void sym_set_change_count(int count)
1147 {
1148         int _sym_change_count = sym_change_count;
1149         sym_change_count = count;
1150         if (conf_changed_callback &&
1151             (bool)_sym_change_count != (bool)count)
1152                 conf_changed_callback();
1153 }
1154
1155 void sym_add_change_count(int count)
1156 {
1157         sym_set_change_count(count + sym_change_count);
1158 }
1159
1160 bool conf_get_changed(void)
1161 {
1162         return sym_change_count;
1163 }
1164
1165 void conf_set_changed_callback(void (*fn)(void))
1166 {
1167         conf_changed_callback = fn;
1168 }
1169
1170 static bool randomize_choice_values(struct symbol *csym)
1171 {
1172         struct property *prop;
1173         struct symbol *sym;
1174         struct expr *e;
1175         int cnt, def;
1176
1177         /*
1178          * If choice is mod then we may have more items selected
1179          * and if no then no-one.
1180          * In both cases stop.
1181          */
1182         if (csym->curr.tri != yes)
1183                 return false;
1184
1185         prop = sym_get_choice_prop(csym);
1186
1187         /* count entries in choice block */
1188         cnt = 0;
1189         expr_list_for_each_sym(prop->expr, e, sym)
1190                 cnt++;
1191
1192         /*
1193          * find a random value and set it to yes,
1194          * set the rest to no so we have only one set
1195          */
1196         def = (rand() % cnt);
1197
1198         cnt = 0;
1199         expr_list_for_each_sym(prop->expr, e, sym) {
1200                 if (def == cnt++) {
1201                         sym->def[S_DEF_USER].tri = yes;
1202                         csym->def[S_DEF_USER].val = sym;
1203                 }
1204                 else {
1205                         sym->def[S_DEF_USER].tri = no;
1206                 }
1207                 sym->flags |= SYMBOL_DEF_USER;
1208                 /* clear VALID to get value calculated */
1209                 sym->flags &= ~SYMBOL_VALID;
1210         }
1211         csym->flags |= SYMBOL_DEF_USER;
1212         /* clear VALID to get value calculated */
1213         csym->flags &= ~(SYMBOL_VALID);
1214
1215         return true;
1216 }
1217
1218 void set_all_choice_values(struct symbol *csym)
1219 {
1220         struct property *prop;
1221         struct symbol *sym;
1222         struct expr *e;
1223
1224         prop = sym_get_choice_prop(csym);
1225
1226         /*
1227          * Set all non-assinged choice values to no
1228          */
1229         expr_list_for_each_sym(prop->expr, e, sym) {
1230                 if (!sym_has_value(sym))
1231                         sym->def[S_DEF_USER].tri = no;
1232         }
1233         csym->flags |= SYMBOL_DEF_USER;
1234         /* clear VALID to get value calculated */
1235         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1236 }
1237
1238 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1239 {
1240         struct symbol *sym, *csym;
1241         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1242                                          * pty: probability of tristate = y
1243                                          * ptm: probability of tristate = m
1244                                          */
1245
1246         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1247                                    * below, otherwise gcc whines about
1248                                    * -Wmaybe-uninitialized */
1249         if (mode == def_random) {
1250                 int n, p[3];
1251                 char *env = getenv("KCONFIG_PROBABILITY");
1252                 n = 0;
1253                 while( env && *env ) {
1254                         char *endp;
1255                         int tmp = strtol( env, &endp, 10 );
1256                         if( tmp >= 0 && tmp <= 100 ) {
1257                                 p[n++] = tmp;
1258                         } else {
1259                                 errno = ERANGE;
1260                                 perror( "KCONFIG_PROBABILITY" );
1261                                 exit( 1 );
1262                         }
1263                         env = (*endp == ':') ? endp+1 : endp;
1264                         if( n >=3 ) {
1265                                 break;
1266                         }
1267                 }
1268                 switch( n ) {
1269                 case 1:
1270                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1271                         break;
1272                 case 2:
1273                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1274                         break;
1275                 case 3:
1276                         pby = p[0]; pty = p[1]; ptm = p[2];
1277                         break;
1278                 }
1279
1280                 if( pty+ptm > 100 ) {
1281                         errno = ERANGE;
1282                         perror( "KCONFIG_PROBABILITY" );
1283                         exit( 1 );
1284                 }
1285         }
1286         bool has_changed = false;
1287
1288         for_all_symbols(i, sym) {
1289                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1290                         continue;
1291                 switch (sym_get_type(sym)) {
1292                 case S_BOOLEAN:
1293                 case S_TRISTATE:
1294                         has_changed = true;
1295                         switch (mode) {
1296                         case def_yes:
1297                                 sym->def[S_DEF_USER].tri = yes;
1298                                 break;
1299                         case def_mod:
1300                                 sym->def[S_DEF_USER].tri = mod;
1301                                 break;
1302                         case def_no:
1303                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1304                                         sym->def[S_DEF_USER].tri = yes;
1305                                 else
1306                                         sym->def[S_DEF_USER].tri = no;
1307                                 break;
1308                         case def_random:
1309                                 sym->def[S_DEF_USER].tri = no;
1310                                 cnt = rand() % 100;
1311                                 if (sym->type == S_TRISTATE) {
1312                                         if (cnt < pty)
1313                                                 sym->def[S_DEF_USER].tri = yes;
1314                                         else if (cnt < (pty+ptm))
1315                                                 sym->def[S_DEF_USER].tri = mod;
1316                                 } else if (cnt < pby)
1317                                         sym->def[S_DEF_USER].tri = yes;
1318                                 break;
1319                         default:
1320                                 continue;
1321                         }
1322                         if (!(sym_is_choice(sym) && mode == def_random))
1323                                 sym->flags |= SYMBOL_DEF_USER;
1324                         break;
1325                 default:
1326                         break;
1327                 }
1328
1329         }
1330
1331         sym_clear_all_valid();
1332
1333         /*
1334          * We have different type of choice blocks.
1335          * If curr.tri equals to mod then we can select several
1336          * choice symbols in one block.
1337          * In this case we do nothing.
1338          * If curr.tri equals yes then only one symbol can be
1339          * selected in a choice block and we set it to yes,
1340          * and the rest to no.
1341          */
1342         if (mode != def_random) {
1343                 for_all_symbols(i, csym) {
1344                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1345                             sym_is_choice_value(csym))
1346                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1347                 }
1348         }
1349
1350         for_all_symbols(i, csym) {
1351                 if (sym_has_value(csym) || !sym_is_choice(csym))
1352                         continue;
1353
1354                 sym_calc_value(csym);
1355                 if (mode == def_random)
1356                         has_changed = randomize_choice_values(csym);
1357                 else {
1358                         set_all_choice_values(csym);
1359                         has_changed = true;
1360                 }
1361         }
1362
1363         return has_changed;
1364 }