scripts/kconfig/confdata.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2002 Roman Zippel <[email protected]>
   4  */
   5
   6 #include <sys/mman.h>
   7 #include <sys/stat.h>
   8 #include <sys/types.h>
   9 #include <ctype.h>
  10 #include <errno.h>
  11 #include <fcntl.h>
  12 #include <limits.h>
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <time.h>
  18 #include <unistd.h>
  19
  20 #include "lkc.h"
  21
  22 /* return true if 'path' exists, false otherwise */
  23 static bool is_present(const char *path)
  24 {
  25         struct stat st;
  26
  27         return !stat(path, &st);
  28 }
  29
  30 /* return true if 'path' exists and it is a directory, false otherwise */
  31 static bool is_dir(const char *path)
  32 {
  33         struct stat st;
  34
  35         if (stat(path, &st))
  36                 return 0;
  37
  38         return S_ISDIR(st.st_mode);
  39 }
  40
  41 /* return true if the given two files are the same, false otherwise */
  42 static bool is_same(const char *file1, const char *file2)
  43 {
  44         int fd1, fd2;
  45         struct stat st1, st2;
  46         void *map1, *map2;
  47         bool ret = false;
  48
  49         fd1 = open(file1, O_RDONLY);
  50         if (fd1 < 0)
  51                 return ret;
  52
  53         fd2 = open(file2, O_RDONLY);
  54         if (fd2 < 0)
  55                 goto close1;
  56
  57         ret = fstat(fd1, &st1);
  58         if (ret)
  59                 goto close2;
  60         ret = fstat(fd2, &st2);
  61         if (ret)
  62                 goto close2;
  63
  64         if (st1.st_size != st2.st_size)
  65                 goto close2;
  66
  67         map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
  68         if (map1 == MAP_FAILED)
  69                 goto close2;
  70
  71         map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
  72         if (map2 == MAP_FAILED)
  73                 goto close2;
  74
  75         if (bcmp(map1, map2, st1.st_size))
  76                 goto close2;
  77
  78         ret = true;
  79 close2:
  80         close(fd2);
  81 close1:
  82         close(fd1);
  83
  84         return ret;
  85 }
  86
  87 /*
  88  * Create the parent directory of the given path.
  89  *
  90  * For example, if 'include/config/auto.conf' is given, create 'include/config'.
  91  */
  92 static int make_parent_dir(const char *path)
  93 {
  94         char tmp[PATH_MAX + 1];
  95         char *p;
  96
  97         strncpy(tmp, path, sizeof(tmp));
  98         tmp[sizeof(tmp) - 1] = 0;
  99
 100         /* Remove the base name. Just return if nothing is left */
 101         p = strrchr(tmp, '/');
 102         if (!p)
 103                 return 0;
 104         *(p + 1) = 0;
 105
 106         /* Just in case it is an absolute path */
 107         p = tmp;
 108         while (*p == '/')
 109                 p++;
 110
 111         while ((p = strchr(p, '/'))) {
 112                 *p = 0;
 113
 114                 /* skip if the directory exists */
 115                 if (!is_dir(tmp) && mkdir(tmp, 0755))
 116                         return -1;
 117
 118                 *p = '/';
 119                 while (*p == '/')
 120                         p++;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static char depfile_path[PATH_MAX];
 127 static size_t depfile_prefix_len;
 128
 129 /* touch depfile for symbol 'name' */
 130 static int conf_touch_dep(const char *name)
 131 {
 132         int fd, ret;
 133         const char *s;
 134         char *d, c;
 135
 136         /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
 137         if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
 138                 return -1;
 139
 140         d = depfile_path + depfile_prefix_len;
 141         s = name;
 142
 143         while ((c = *s++))
 144                 *d++ = (c == '_') ? '/' : tolower(c);
 145         strcpy(d, ".h");
 146
 147         /* Assume directory path already exists. */
 148         fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 149         if (fd == -1) {
 150                 if (errno != ENOENT)
 151                         return -1;
 152
 153                 ret = make_parent_dir(depfile_path);
 154                 if (ret)
 155                         return ret;
 156
 157                 /* Try it again. */
 158                 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 159                 if (fd == -1)
 160                         return -1;
 161         }
 162         close(fd);
 163
 164         return 0;
 165 }
 166
 167 struct conf_printer {
 168         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
 169         void (*print_comment)(FILE *, const char *, void *);
 170 };
 171
 172 static void conf_warning(const char *fmt, ...)
 173         __attribute__ ((format (printf, 1, 2)));
 174
 175 static void conf_message(const char *fmt, ...)
 176         __attribute__ ((format (printf, 1, 2)));
 177
 178 static const char *conf_filename;
 179 static int conf_lineno, conf_warnings;
 180
 181 static void conf_warning(const char *fmt, ...)
 182 {
 183         va_list ap;
 184         va_start(ap, fmt);
 185         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
 186         vfprintf(stderr, fmt, ap);
 187         fprintf(stderr, "\n");
 188         va_end(ap);
 189         conf_warnings++;
 190 }
 191
 192 static void conf_default_message_callback(const char *s)
 193 {
 194         printf("#\n# ");
 195         printf("%s", s);
 196         printf("\n#\n");
 197 }
 198
 199 static void (*conf_message_callback)(const char *s) =
 200         conf_default_message_callback;
 201 void conf_set_message_callback(void (*fn)(const char *s))
 202 {
 203         conf_message_callback = fn;
 204 }
 205
 206 static void conf_message(const char *fmt, ...)
 207 {
 208         va_list ap;
 209         char buf[4096];
 210
 211         if (!conf_message_callback)
 212                 return;
 213
 214         va_start(ap, fmt);
 215
 216         vsnprintf(buf, sizeof(buf), fmt, ap);
 217         conf_message_callback(buf);
 218         va_end(ap);
 219 }
 220
 221 const char *conf_get_configname(void)
 222 {
 223         char *name = getenv("KCONFIG_CONFIG");
 224
 225         return name ? name : ".config";
 226 }
 227
 228 static const char *conf_get_autoconfig_name(void)
 229 {
 230         char *name = getenv("KCONFIG_AUTOCONFIG");
 231
 232         return name ? name : "include/config/auto.conf";
 233 }
 234
 235 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 236 {
 237         char *p2;
 238
 239         switch (sym->type) {
 240         case S_TRISTATE:
 241                 if (p[0] == 'm') {
 242                         sym->def[def].tri = mod;
 243                         sym->flags |= def_flags;
 244                         break;
 245                 }
 246                 /* fall through */
 247         case S_BOOLEAN:
 248                 if (p[0] == 'y') {
 249                         sym->def[def].tri = yes;
 250                         sym->flags |= def_flags;
 251                         break;
 252                 }
 253                 if (p[0] == 'n') {
 254                         sym->def[def].tri = no;
 255                         sym->flags |= def_flags;
 256                         break;
 257                 }
 258                 if (def != S_DEF_AUTO)
 259                         conf_warning("symbol value '%s' invalid for %s",
 260                                      p, sym->name);
 261                 return 1;
 262         case S_STRING:
 263                 if (*p++ != '"')
 264                         break;
 265                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 266                         if (*p2 == '"') {
 267                                 *p2 = 0;
 268                                 break;
 269                         }
 270                         memmove(p2, p2 + 1, strlen(p2));
 271                 }
 272                 if (!p2) {
 273                         if (def != S_DEF_AUTO)
 274                                 conf_warning("invalid string found");
 275                         return 1;
 276                 }
 277                 /* fall through */
 278         case S_INT:
 279         case S_HEX:
 280                 if (sym_string_valid(sym, p)) {
 281                         sym->def[def].val = xstrdup(p);
 282                         sym->flags |= def_flags;
 283                 } else {
 284                         if (def != S_DEF_AUTO)
 285                                 conf_warning("symbol value '%s' invalid for %s",
 286                                              p, sym->name);
 287                         return 1;
 288                 }
 289                 break;
 290         default:
 291                 ;
 292         }
 293         return 0;
 294 }
 295
 296 #define LINE_GROWTH 16
 297 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 298 {
 299         char *nline;
 300         size_t new_size = slen + 1;
 301         if (new_size > *n) {
 302                 new_size += LINE_GROWTH - 1;
 303                 new_size *= 2;
 304                 nline = xrealloc(*lineptr, new_size);
 305                 if (!nline)
 306                         return -1;
 307
 308                 *lineptr = nline;
 309                 *n = new_size;
 310         }
 311
 312         (*lineptr)[slen] = c;
 313
 314         return 0;
 315 }
 316
 317 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 318 {
 319         char *line = *lineptr;
 320         size_t slen = 0;
 321
 322         for (;;) {
 323                 int c = getc(stream);
 324
 325                 switch (c) {
 326                 case '\n':
 327                         if (add_byte(c, &line, slen, n) < 0)
 328                                 goto e_out;
 329                         slen++;
 330                         /* fall through */
 331                 case EOF:
 332                         if (add_byte('\0', &line, slen, n) < 0)
 333                                 goto e_out;
 334                         *lineptr = line;
 335                         if (slen == 0)
 336                                 return -1;
 337                         return slen;
 338                 default:
 339                         if (add_byte(c, &line, slen, n) < 0)
 340                                 goto e_out;
 341                         slen++;
 342                 }
 343         }
 344
 345 e_out:
 346         line[slen-1] = '\0';
 347         *lineptr = line;
 348         return -1;
 349 }
 350
 351 int conf_read_simple(const char *name, int def)
 352 {
 353         FILE *in = NULL;
 354         char   *line = NULL;
 355         size_t  line_asize = 0;
 356         char *p, *p2;
 357         struct symbol *sym;
 358         int i, def_flags;
 359
 360         if (name) {
 361                 in = zconf_fopen(name);
 362         } else {
 363                 struct property *prop;
 364
 365                 name = conf_get_configname();
 366                 in = zconf_fopen(name);
 367                 if (in)
 368                         goto load;
 369                 sym_add_change_count(1);
 370                 if (!sym_defconfig_list)
 371                         return 1;
 372
 373                 for_all_defaults(sym_defconfig_list, prop) {
 374                         if (expr_calc_value(prop->visible.expr) == no ||
 375                             prop->expr->type != E_SYMBOL)
 376                                 continue;
 377                         sym_calc_value(prop->expr->left.sym);
 378                         name = sym_get_string_value(prop->expr->left.sym);
 379                         in = zconf_fopen(name);
 380                         if (in) {
 381                                 conf_message("using defaults found in %s",
 382                                          name);
 383                                 goto load;
 384                         }
 385                 }
 386         }
 387         if (!in)
 388                 return 1;
 389
 390 load:
 391         conf_filename = name;
 392         conf_lineno = 0;
 393         conf_warnings = 0;
 394
 395         def_flags = SYMBOL_DEF << def;
 396         for_all_symbols(i, sym) {
 397                 sym->flags |= SYMBOL_CHANGED;
 398                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 399                 if (sym_is_choice(sym))
 400                         sym->flags |= def_flags;
 401                 switch (sym->type) {
 402                 case S_INT:
 403                 case S_HEX:
 404                 case S_STRING:
 405                         if (sym->def[def].val)
 406                                 free(sym->def[def].val);
 407                         /* fall through */
 408                 default:
 409                         sym->def[def].val = NULL;
 410                         sym->def[def].tri = no;
 411                 }
 412         }
 413
 414         while (compat_getline(&line, &line_asize, in) != -1) {
 415                 conf_lineno++;
 416                 sym = NULL;
 417                 if (line[0] == '#') {
 418                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 419                                 continue;
 420                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 421                         if (!p)
 422                                 continue;
 423                         *p++ = 0;
 424                         if (strncmp(p, "is not set", 10))
 425                                 continue;
 426                         if (def == S_DEF_USER) {
 427                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 428                                 if (!sym) {
 429                                         sym_add_change_count(1);
 430                                         continue;
 431                                 }
 432                         } else {
 433                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 434                                 if (sym->type == S_UNKNOWN)
 435                                         sym->type = S_BOOLEAN;
 436                         }
 437                         if (sym->flags & def_flags) {
 438                                 conf_warning("override: reassigning to symbol %s", sym->name);
 439                         }
 440                         switch (sym->type) {
 441                         case S_BOOLEAN:
 442                         case S_TRISTATE:
 443                                 sym->def[def].tri = no;
 444                                 sym->flags |= def_flags;
 445                                 break;
 446                         default:
 447                                 ;
 448                         }
 449                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 450                         p = strchr(line + strlen(CONFIG_), '=');
 451                         if (!p)
 452                                 continue;
 453                         *p++ = 0;
 454                         p2 = strchr(p, '\n');
 455                         if (p2) {
 456                                 *p2-- = 0;
 457                                 if (*p2 == '\r')
 458                                         *p2 = 0;
 459                         }
 460
 461                         sym = sym_find(line + strlen(CONFIG_));
 462                         if (!sym) {
 463                                 if (def == S_DEF_AUTO)
 464                                         /*
 465                                          * Reading from include/config/auto.conf
 466                                          * If CONFIG_FOO previously existed in
 467                                          * auto.conf but it is missing now,
 468                                          * include/config/foo.h must be touched.
 469                                          */
 470                                         conf_touch_dep(line + strlen(CONFIG_));
 471                                 else
 472                                         sym_add_change_count(1);
 473                                 continue;
 474                         }
 475
 476                         if (sym->flags & def_flags) {
 477                                 conf_warning("override: reassigning to symbol %s", sym->name);
 478                         }
 479                         if (conf_set_sym_val(sym, def, def_flags, p))
 480                                 continue;
 481                 } else {
 482                         if (line[0] != '\r' && line[0] != '\n')
 483                                 conf_warning("unexpected data: %.*s",
 484                                              (int)strcspn(line, "\r\n"), line);
 485
 486                         continue;
 487                 }
 488
 489                 if (sym && sym_is_choice_value(sym)) {
 490                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 491                         switch (sym->def[def].tri) {
 492                         case no:
 493                                 break;
 494                         case mod:
 495                                 if (cs->def[def].tri == yes) {
 496                                         conf_warning("%s creates inconsistent choice state", sym->name);
 497                                         cs->flags &= ~def_flags;
 498                                 }
 499                                 break;
 500                         case yes:
 501                                 if (cs->def[def].tri != no)
 502                                         conf_warning("override: %s changes choice state", sym->name);
 503                                 cs->def[def].val = sym;
 504                                 break;
 505                         }
 506                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 507                 }
 508         }
 509         free(line);
 510         fclose(in);
 511         return 0;
 512 }
 513
 514 int conf_read(const char *name)
 515 {
 516         struct symbol *sym;
 517         int conf_unsaved = 0;
 518         int i;
 519
 520         sym_set_change_count(0);
 521
 522         if (conf_read_simple(name, S_DEF_USER)) {
 523                 sym_calc_value(modules_sym);
 524                 return 1;
 525         }
 526
 527         sym_calc_value(modules_sym);
 528
 529         for_all_symbols(i, sym) {
 530                 sym_calc_value(sym);
 531                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 532                         continue;
 533                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 534                         /* check that calculated value agrees with saved value */
 535                         switch (sym->type) {
 536                         case S_BOOLEAN:
 537                         case S_TRISTATE:
 538                                 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
 539                                         continue;
 540                                 break;
 541                         default:
 542                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 543                                         continue;
 544                                 break;
 545                         }
 546                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 547                         /* no previous value and not saved */
 548                         continue;
 549                 conf_unsaved++;
 550                 /* maybe print value in verbose mode... */
 551         }
 552
 553         for_all_symbols(i, sym) {
 554                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 555                         /* Reset values of generates values, so they'll appear
 556                          * as new, if they should become visible, but that
 557                          * doesn't quite work if the Kconfig and the saved
 558                          * configuration disagree.
 559                          */
 560                         if (sym->visible == no && !conf_unsaved)
 561                                 sym->flags &= ~SYMBOL_DEF_USER;
 562                         switch (sym->type) {
 563                         case S_STRING:
 564                         case S_INT:
 565                         case S_HEX:
 566                                 /* Reset a string value if it's out of range */
 567                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 568                                         break;
 569                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 570                                 conf_unsaved++;
 571                                 break;
 572                         default:
 573                                 break;
 574                         }
 575                 }
 576         }
 577
 578         sym_add_change_count(conf_warnings || conf_unsaved);
 579
 580         return 0;
 581 }
 582
 583 /*
 584  * Kconfig configuration printer
 585  *
 586  * This printer is used when generating the resulting configuration after
 587  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 588  * passing a non-NULL argument to the printer.
 589  *
 590  */
 591 static void
 592 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 593 {
 594
 595         switch (sym->type) {
 596         case S_BOOLEAN:
 597         case S_TRISTATE:
 598                 if (*value == 'n') {
 599                         bool skip_unset = (arg != NULL);
 600
 601                         if (!skip_unset)
 602                                 fprintf(fp, "# %s%s is not set\n",
 603                                     CONFIG_, sym->name);
 604                         return;
 605                 }
 606                 break;
 607         default:
 608                 break;
 609         }
 610
 611         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 612 }
 613
 614 static void
 615 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 616 {
 617         const char *p = value;
 618         size_t l;
 619
 620         for (;;) {
 621                 l = strcspn(p, "\n");
 622                 fprintf(fp, "#");
 623                 if (l) {
 624                         fprintf(fp, " ");
 625                         xfwrite(p, l, 1, fp);
 626                         p += l;
 627                 }
 628                 fprintf(fp, "\n");
 629                 if (*p++ == '\0')
 630                         break;
 631         }
 632 }
 633
 634 static struct conf_printer kconfig_printer_cb =
 635 {
 636         .print_symbol = kconfig_print_symbol,
 637         .print_comment = kconfig_print_comment,
 638 };
 639
 640 /*
 641  * Header printer
 642  *
 643  * This printer is used when generating the `include/generated/autoconf.h' file.
 644  */
 645 static void
 646 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 647 {
 648
 649         switch (sym->type) {
 650         case S_BOOLEAN:
 651         case S_TRISTATE: {
 652                 const char *suffix = "";
 653
 654                 switch (*value) {
 655                 case 'n':
 656                         break;
 657                 case 'm':
 658                         suffix = "_MODULE";
 659                         /* fall through */
 660                 default:
 661                         fprintf(fp, "#define %s%s%s 1\n",
 662                             CONFIG_, sym->name, suffix);
 663                 }
 664                 break;
 665         }
 666         case S_HEX: {
 667                 const char *prefix = "";
 668
 669                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 670                         prefix = "0x";
 671                 fprintf(fp, "#define %s%s %s%s\n",
 672                     CONFIG_, sym->name, prefix, value);
 673                 break;
 674         }
 675         case S_STRING:
 676         case S_INT:
 677                 fprintf(fp, "#define %s%s %s\n",
 678                     CONFIG_, sym->name, value);
 679                 break;
 680         default:
 681                 break;
 682         }
 683
 684 }
 685
 686 static void
 687 header_print_comment(FILE *fp, const char *value, void *arg)
 688 {
 689         const char *p = value;
 690         size_t l;
 691
 692         fprintf(fp, "/*\n");
 693         for (;;) {
 694                 l = strcspn(p, "\n");
 695                 fprintf(fp, " *");
 696                 if (l) {
 697                         fprintf(fp, " ");
 698                         xfwrite(p, l, 1, fp);
 699                         p += l;
 700                 }
 701                 fprintf(fp, "\n");
 702                 if (*p++ == '\0')
 703                         break;
 704         }
 705         fprintf(fp, " */\n");
 706 }
 707
 708 static struct conf_printer header_printer_cb =
 709 {
 710         .print_symbol = header_print_symbol,
 711         .print_comment = header_print_comment,
 712 };
 713
 714 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 715                               struct conf_printer *printer, void *printer_arg)
 716 {
 717         const char *str;
 718
 719         switch (sym->type) {
 720         case S_UNKNOWN:
 721                 break;
 722         case S_STRING:
 723                 str = sym_get_string_value(sym);
 724                 str = sym_escape_string_value(str);
 725                 printer->print_symbol(fp, sym, str, printer_arg);
 726                 free((void *)str);
 727                 break;
 728         default:
 729                 str = sym_get_string_value(sym);
 730                 printer->print_symbol(fp, sym, str, printer_arg);
 731         }
 732 }
 733
 734 static void
 735 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 736 {
 737         char buf[256];
 738
 739         snprintf(buf, sizeof(buf),
 740             "\n"
 741             "Automatically generated file; DO NOT EDIT.\n"
 742             "%s\n",
 743             rootmenu.prompt->text);
 744
 745         printer->print_comment(fp, buf, printer_arg);
 746 }
 747
 748 /*
 749  * Write out a minimal config.
 750  * All values that has default values are skipped as this is redundant.
 751  */
 752 int conf_write_defconfig(const char *filename)
 753 {
 754         struct symbol *sym;
 755         struct menu *menu;
 756         FILE *out;
 757
 758         out = fopen(filename, "w");
 759         if (!out)
 760                 return 1;
 761
 762         sym_clear_all_valid();
 763
 764         /* Traverse all menus to find all relevant symbols */
 765         menu = rootmenu.list;
 766
 767         while (menu != NULL)
 768         {
 769                 sym = menu->sym;
 770                 if (sym == NULL) {
 771                         if (!menu_is_visible(menu))
 772                                 goto next_menu;
 773                 } else if (!sym_is_choice(sym)) {
 774                         sym_calc_value(sym);
 775                         if (!(sym->flags & SYMBOL_WRITE))
 776                                 goto next_menu;
 777                         sym->flags &= ~SYMBOL_WRITE;
 778                         /* If we cannot change the symbol - skip */
 779                         if (!sym_is_changeable(sym))
 780                                 goto next_menu;
 781                         /* If symbol equals to default value - skip */
 782                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 783                                 goto next_menu;
 784
 785                         /*
 786                          * If symbol is a choice value and equals to the
 787                          * default for a choice - skip.
 788                          * But only if value is bool and equal to "y" and
 789                          * choice is not "optional".
 790                          * (If choice is "optional" then all values can be "n")
 791                          */
 792                         if (sym_is_choice_value(sym)) {
 793                                 struct symbol *cs;
 794                                 struct symbol *ds;
 795
 796                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 797                                 ds = sym_choice_default(cs);
 798                                 if (!sym_is_optional(cs) && sym == ds) {
 799                                         if ((sym->type == S_BOOLEAN) &&
 800                                             sym_get_tristate_value(sym) == yes)
 801                                                 goto next_menu;
 802                                 }
 803                         }
 804                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 805                 }
 806 next_menu:
 807                 if (menu->list != NULL) {
 808                         menu = menu->list;
 809                 }
 810                 else if (menu->next != NULL) {
 811                         menu = menu->next;
 812                 } else {
 813                         while ((menu = menu->parent)) {
 814                                 if (menu->next != NULL) {
 815                                         menu = menu->next;
 816                                         break;
 817                                 }
 818                         }
 819                 }
 820         }
 821         fclose(out);
 822         return 0;
 823 }
 824
 825 int conf_write(const char *name)
 826 {
 827         FILE *out;
 828         struct symbol *sym;
 829         struct menu *menu;
 830         const char *str;
 831         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 832         char *env;
 833         int i;
 834         bool need_newline = false;
 835
 836         if (!name)
 837                 name = conf_get_configname();
 838
 839         if (!*name) {
 840                 fprintf(stderr, "config name is empty\n");
 841                 return -1;
 842         }
 843
 844         if (is_dir(name)) {
 845                 fprintf(stderr, "%s: Is a directory\n", name);
 846                 return -1;
 847         }
 848
 849         if (make_parent_dir(name))
 850                 return -1;
 851
 852         env = getenv("KCONFIG_OVERWRITECONFIG");
 853         if (env && *env) {
 854                 *tmpname = 0;
 855                 out = fopen(name, "w");
 856         } else {
 857                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 858                          name, (int)getpid());
 859                 out = fopen(tmpname, "w");
 860         }
 861         if (!out)
 862                 return 1;
 863
 864         conf_write_heading(out, &kconfig_printer_cb, NULL);
 865
 866         if (!conf_get_changed())
 867                 sym_clear_all_valid();
 868
 869         menu = rootmenu.list;
 870         while (menu) {
 871                 sym = menu->sym;
 872                 if (!sym) {
 873                         if (!menu_is_visible(menu))
 874                                 goto next;
 875                         str = menu_get_prompt(menu);
 876                         fprintf(out, "\n"
 877                                      "#\n"
 878                                      "# %s\n"
 879                                      "#\n", str);
 880                         need_newline = false;
 881                 } else if (!(sym->flags & SYMBOL_CHOICE) &&
 882                            !(sym->flags & SYMBOL_WRITTEN)) {
 883                         sym_calc_value(sym);
 884                         if (!(sym->flags & SYMBOL_WRITE))
 885                                 goto next;
 886                         if (need_newline) {
 887                                 fprintf(out, "\n");
 888                                 need_newline = false;
 889                         }
 890                         sym->flags |= SYMBOL_WRITTEN;
 891                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 892                 }
 893
 894 next:
 895                 if (menu->list) {
 896                         menu = menu->list;
 897                         continue;
 898                 }
 899                 if (menu->next)
 900                         menu = menu->next;
 901                 else while ((menu = menu->parent)) {
 902                         if (!menu->sym && menu_is_visible(menu) &&
 903                             menu != &rootmenu) {
 904                                 str = menu_get_prompt(menu);
 905                                 fprintf(out, "# end of %s\n", str);
 906                                 need_newline = true;
 907                         }
 908                         if (menu->next) {
 909                                 menu = menu->next;
 910                                 break;
 911                         }
 912                 }
 913         }
 914         fclose(out);
 915
 916         for_all_symbols(i, sym)
 917                 sym->flags &= ~SYMBOL_WRITTEN;
 918
 919         if (*tmpname) {
 920                 if (is_same(name, tmpname)) {
 921                         conf_message("No change to %s", name);
 922                         unlink(tmpname);
 923                         sym_set_change_count(0);
 924                         return 0;
 925                 }
 926
 927                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 928                 rename(name, oldname);
 929                 if (rename(tmpname, name))
 930                         return 1;
 931         }
 932
 933         conf_message("configuration written to %s", name);
 934
 935         sym_set_change_count(0);
 936
 937         return 0;
 938 }
 939
 940 /* write a dependency file as used by kbuild to track dependencies */
 941 static int conf_write_dep(const char *name)
 942 {
 943         struct file *file;
 944         FILE *out;
 945
 946         out = fopen("..config.tmp", "w");
 947         if (!out)
 948                 return 1;
 949         fprintf(out, "deps_config := \\\n");
 950         for (file = file_list; file; file = file->next) {
 951                 if (file->next)
 952                         fprintf(out, "\t%s \\\n", file->name);
 953                 else
 954                         fprintf(out, "\t%s\n", file->name);
 955         }
 956         fprintf(out, "\n%s: \\\n"
 957                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
 958
 959         env_write_dep(out, conf_get_autoconfig_name());
 960
 961         fprintf(out, "\n$(deps_config): ;\n");
 962         fclose(out);
 963
 964         if (make_parent_dir(name))
 965                 return 1;
 966         rename("..config.tmp", name);
 967         return 0;
 968 }
 969
 970 static int conf_touch_deps(void)
 971 {
 972         const char *name;
 973         struct symbol *sym;
 974         int res, i;
 975
 976         strcpy(depfile_path, "include/config/");
 977         depfile_prefix_len = strlen(depfile_path);
 978
 979         name = conf_get_autoconfig_name();
 980         conf_read_simple(name, S_DEF_AUTO);
 981         sym_calc_value(modules_sym);
 982
 983         for_all_symbols(i, sym) {
 984                 sym_calc_value(sym);
 985                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
 986                         continue;
 987                 if (sym->flags & SYMBOL_WRITE) {
 988                         if (sym->flags & SYMBOL_DEF_AUTO) {
 989                                 /*
 990                                  * symbol has old and new value,
 991                                  * so compare them...
 992                                  */
 993                                 switch (sym->type) {
 994                                 case S_BOOLEAN:
 995                                 case S_TRISTATE:
 996                                         if (sym_get_tristate_value(sym) ==
 997                                             sym->def[S_DEF_AUTO].tri)
 998                                                 continue;
 999                                         break;
1000                                 case S_STRING:
1001                                 case S_HEX:
1002                                 case S_INT:
1003                                         if (!strcmp(sym_get_string_value(sym),
1004                                                     sym->def[S_DEF_AUTO].val))
1005                                                 continue;
1006                                         break;
1007                                 default:
1008                                         break;
1009                                 }
1010                         } else {
1011                                 /*
1012                                  * If there is no old value, only 'no' (unset)
1013                                  * is allowed as new value.
1014                                  */
1015                                 switch (sym->type) {
1016                                 case S_BOOLEAN:
1017                                 case S_TRISTATE:
1018                                         if (sym_get_tristate_value(sym) == no)
1019                                                 continue;
1020                                         break;
1021                                 default:
1022                                         break;
1023                                 }
1024                         }
1025                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1026                         /* There is neither an old nor a new value. */
1027                         continue;
1028                 /* else
1029                  *      There is an old value, but no new value ('no' (unset)
1030                  *      isn't saved in auto.conf, so the old value is always
1031                  *      different from 'no').
1032                  */
1033
1034                 res = conf_touch_dep(sym->name);
1035                 if (res)
1036                         return res;
1037         }
1038
1039         return 0;
1040 }
1041
1042 int conf_write_autoconf(int overwrite)
1043 {
1044         struct symbol *sym;
1045         const char *name;
1046         const char *autoconf_name = conf_get_autoconfig_name();
1047         FILE *out, *out_h;
1048         int i;
1049
1050         if (!overwrite && is_present(autoconf_name))
1051                 return 0;
1052
1053         conf_write_dep("include/config/auto.conf.cmd");
1054
1055         if (conf_touch_deps())
1056                 return 1;
1057
1058         out = fopen(".tmpconfig", "w");
1059         if (!out)
1060                 return 1;
1061
1062         out_h = fopen(".tmpconfig.h", "w");
1063         if (!out_h) {
1064                 fclose(out);
1065                 return 1;
1066         }
1067
1068         conf_write_heading(out, &kconfig_printer_cb, NULL);
1069         conf_write_heading(out_h, &header_printer_cb, NULL);
1070
1071         for_all_symbols(i, sym) {
1072                 sym_calc_value(sym);
1073                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1074                         continue;
1075
1076                 /* write symbols to auto.conf and autoconf.h */
1077                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1078                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1079         }
1080         fclose(out);
1081         fclose(out_h);
1082
1083         name = getenv("KCONFIG_AUTOHEADER");
1084         if (!name)
1085                 name = "include/generated/autoconf.h";
1086         if (make_parent_dir(name))
1087                 return 1;
1088         if (rename(".tmpconfig.h", name))
1089                 return 1;
1090
1091         if (make_parent_dir(autoconf_name))
1092                 return 1;
1093         /*
1094          * This must be the last step, kbuild has a dependency on auto.conf
1095          * and this marks the successful completion of the previous steps.
1096          */
1097         if (rename(".tmpconfig", autoconf_name))
1098                 return 1;
1099
1100         return 0;
1101 }
1102
1103 static int sym_change_count;
1104 static void (*conf_changed_callback)(void);
1105
1106 void sym_set_change_count(int count)
1107 {
1108         int _sym_change_count = sym_change_count;
1109         sym_change_count = count;
1110         if (conf_changed_callback &&
1111             (bool)_sym_change_count != (bool)count)
1112                 conf_changed_callback();
1113 }
1114
1115 void sym_add_change_count(int count)
1116 {
1117         sym_set_change_count(count + sym_change_count);
1118 }
1119
1120 bool conf_get_changed(void)
1121 {
1122         return sym_change_count;
1123 }
1124
1125 void conf_set_changed_callback(void (*fn)(void))
1126 {
1127         conf_changed_callback = fn;
1128 }
1129
1130 static bool randomize_choice_values(struct symbol *csym)
1131 {
1132         struct property *prop;
1133         struct symbol *sym;
1134         struct expr *e;
1135         int cnt, def;
1136
1137         /*
1138          * If choice is mod then we may have more items selected
1139          * and if no then no-one.
1140          * In both cases stop.
1141          */
1142         if (csym->curr.tri != yes)
1143                 return false;
1144
1145         prop = sym_get_choice_prop(csym);
1146
1147         /* count entries in choice block */
1148         cnt = 0;
1149         expr_list_for_each_sym(prop->expr, e, sym)
1150                 cnt++;
1151
1152         /*
1153          * find a random value and set it to yes,
1154          * set the rest to no so we have only one set
1155          */
1156         def = (rand() % cnt);
1157
1158         cnt = 0;
1159         expr_list_for_each_sym(prop->expr, e, sym) {
1160                 if (def == cnt++) {
1161                         sym->def[S_DEF_USER].tri = yes;
1162                         csym->def[S_DEF_USER].val = sym;
1163                 }
1164                 else {
1165                         sym->def[S_DEF_USER].tri = no;
1166                 }
1167                 sym->flags |= SYMBOL_DEF_USER;
1168                 /* clear VALID to get value calculated */
1169                 sym->flags &= ~SYMBOL_VALID;
1170         }
1171         csym->flags |= SYMBOL_DEF_USER;
1172         /* clear VALID to get value calculated */
1173         csym->flags &= ~(SYMBOL_VALID);
1174
1175         return true;
1176 }
1177
1178 void set_all_choice_values(struct symbol *csym)
1179 {
1180         struct property *prop;
1181         struct symbol *sym;
1182         struct expr *e;
1183
1184         prop = sym_get_choice_prop(csym);
1185
1186         /*
1187          * Set all non-assinged choice values to no
1188          */
1189         expr_list_for_each_sym(prop->expr, e, sym) {
1190                 if (!sym_has_value(sym))
1191                         sym->def[S_DEF_USER].tri = no;
1192         }
1193         csym->flags |= SYMBOL_DEF_USER;
1194         /* clear VALID to get value calculated */
1195         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1196 }
1197
1198 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1199 {
1200         struct symbol *sym, *csym;
1201         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1202                                          * pty: probability of tristate = y
1203                                          * ptm: probability of tristate = m
1204                                          */
1205
1206         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1207                                    * below, otherwise gcc whines about
1208                                    * -Wmaybe-uninitialized */
1209         if (mode == def_random) {
1210                 int n, p[3];
1211                 char *env = getenv("KCONFIG_PROBABILITY");
1212                 n = 0;
1213                 while( env && *env ) {
1214                         char *endp;
1215                         int tmp = strtol( env, &endp, 10 );
1216                         if( tmp >= 0 && tmp <= 100 ) {
1217                                 p[n++] = tmp;
1218                         } else {
1219                                 errno = ERANGE;
1220                                 perror( "KCONFIG_PROBABILITY" );
1221                                 exit( 1 );
1222                         }
1223                         env = (*endp == ':') ? endp+1 : endp;
1224                         if( n >=3 ) {
1225                                 break;
1226                         }
1227                 }
1228                 switch( n ) {
1229                 case 1:
1230                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1231                         break;
1232                 case 2:
1233                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1234                         break;
1235                 case 3:
1236                         pby = p[0]; pty = p[1]; ptm = p[2];
1237                         break;
1238                 }
1239
1240                 if( pty+ptm > 100 ) {
1241                         errno = ERANGE;
1242                         perror( "KCONFIG_PROBABILITY" );
1243                         exit( 1 );
1244                 }
1245         }
1246         bool has_changed = false;
1247
1248         for_all_symbols(i, sym) {
1249                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1250                         continue;
1251                 switch (sym_get_type(sym)) {
1252                 case S_BOOLEAN:
1253                 case S_TRISTATE:
1254                         has_changed = true;
1255                         switch (mode) {
1256                         case def_yes:
1257                                 sym->def[S_DEF_USER].tri = yes;
1258                                 break;
1259                         case def_mod:
1260                                 sym->def[S_DEF_USER].tri = mod;
1261                                 break;
1262                         case def_no:
1263                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1264                                         sym->def[S_DEF_USER].tri = yes;
1265                                 else
1266                                         sym->def[S_DEF_USER].tri = no;
1267                                 break;
1268                         case def_random:
1269                                 sym->def[S_DEF_USER].tri = no;
1270                                 cnt = rand() % 100;
1271                                 if (sym->type == S_TRISTATE) {
1272                                         if (cnt < pty)
1273                                                 sym->def[S_DEF_USER].tri = yes;
1274                                         else if (cnt < (pty+ptm))
1275                                                 sym->def[S_DEF_USER].tri = mod;
1276                                 } else if (cnt < pby)
1277                                         sym->def[S_DEF_USER].tri = yes;
1278                                 break;
1279                         default:
1280                                 continue;
1281                         }
1282                         if (!(sym_is_choice(sym) && mode == def_random))
1283                                 sym->flags |= SYMBOL_DEF_USER;
1284                         break;
1285                 default:
1286                         break;
1287                 }
1288
1289         }
1290
1291         sym_clear_all_valid();
1292
1293         /*
1294          * We have different type of choice blocks.
1295          * If curr.tri equals to mod then we can select several
1296          * choice symbols in one block.
1297          * In this case we do nothing.
1298          * If curr.tri equals yes then only one symbol can be
1299          * selected in a choice block and we set it to yes,
1300          * and the rest to no.
1301          */
1302         if (mode != def_random) {
1303                 for_all_symbols(i, csym) {
1304                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1305                             sym_is_choice_value(csym))
1306                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1307                 }
1308         }
1309
1310         for_all_symbols(i, csym) {
1311                 if (sym_has_value(csym) || !sym_is_choice(csym))
1312                         continue;
1313
1314                 sym_calc_value(csym);
1315                 if (mode == def_random)
1316                         has_changed |= randomize_choice_values(csym);
1317                 else {
1318                         set_all_choice_values(csym);
1319                         has_changed = true;
1320                 }
1321         }
1322
1323         return has_changed;
1324 }
1325
1326 void conf_rewrite_mod_or_yes(enum conf_def_mode mode)
1327 {
1328         struct symbol *sym;
1329         int i;
1330         tristate old_val = (mode == def_y2m) ? yes : mod;
1331         tristate new_val = (mode == def_y2m) ? mod : yes;
1332
1333         for_all_symbols(i, sym) {
1334                 if (sym_get_type(sym) == S_TRISTATE &&
1335                     sym->def[S_DEF_USER].tri == old_val)
1336                         sym->def[S_DEF_USER].tri = new_val;
1337         }
1338         sym_clear_all_valid();
1339 }