config/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 <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/generated/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_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 616 {
 617
 618         switch (sym->type) {
 619         case S_BOOLEAN:
 620         case S_TRISTATE:
 621                 if (*value == 'n') {
 622                         bool skip_unset = (arg != NULL);
 623
 624                         if (!skip_unset)
 625                                 fprintf(fp, "set(%s%s false)\n",
 626                                         CONFIG_, sym->name, value);
 627                         return;
 628                 } else if (*value == 'm') {
 629                         abort();
 630                 } else {
 631                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 632                 }
 633                 break;
 634         case S_HEX: {
 635                 const char *prefix = "";
 636
 637                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 638                         prefix = "0x";
 639                 fprintf(fp, "set(%s%s %s%s)\n",
 640                     CONFIG_, sym->name, prefix, value);
 641                 break;
 642         }
 643         case S_STRING:
 644         case S_INT:
 645                 fprintf(fp, "set(%s%s %s)\n",
 646                     CONFIG_, sym->name, value);
 647                 break;
 648         default:
 649                 break;
 650         }
 651
 652 }
 653
 654 static void
 655 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 656 {
 657         const char *p = value;
 658         size_t l;
 659
 660         for (;;) {
 661                 l = strcspn(p, "\n");
 662                 fprintf(fp, "#");
 663                 if (l) {
 664                         fprintf(fp, " ");
 665                         xfwrite(p, l, 1, fp);
 666                         p += l;
 667                 }
 668                 fprintf(fp, "\n");
 669                 if (*p++ == '\0')
 670                         break;
 671         }
 672 }
 673
 674 static struct conf_printer kconfig_printer_cb =
 675 {
 676         .print_symbol = kconfig_print_symbol,
 677         .print_comment = kconfig_print_comment,
 678 };
 679
 680 static struct conf_printer kconfig_printer_cmake_cb =
 681 {
 682         .print_symbol = kconfig_print_cmake_symbol,
 683         .print_comment = kconfig_print_comment,
 684 };
 685
 686 /*
 687  * Header printer
 688  *
 689  * This printer is used when generating the `include/generated/autoconf.h' file.
 690  */
 691 static void
 692 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 693 {
 694
 695         switch (sym->type) {
 696         case S_BOOLEAN:
 697         case S_TRISTATE: {
 698                 const char *suffix = "";
 699
 700                 switch (*value) {
 701                 case 'n':
 702                         break;
 703                 case 'm':
 704                         suffix = "_MODULE";
 705                         /* fall through */
 706                 default:
 707                         fprintf(fp, "#define %s%s%s 1\n",
 708                             CONFIG_, sym->name, suffix);
 709                 }
 710                 break;
 711         }
 712         case S_HEX: {
 713                 const char *prefix = "";
 714
 715                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 716                         prefix = "0x";
 717                 fprintf(fp, "#define %s%s %s%s\n",
 718                     CONFIG_, sym->name, prefix, value);
 719                 break;
 720         }
 721         case S_STRING:
 722         case S_INT:
 723                 fprintf(fp, "#define %s%s %s\n",
 724                     CONFIG_, sym->name, value);
 725                 break;
 726         default:
 727                 break;
 728         }
 729
 730 }
 731
 732 static void
 733 header_print_comment(FILE *fp, const char *value, void *arg)
 734 {
 735         const char *p = value;
 736         size_t l;
 737
 738         fprintf(fp, "/*\n");
 739         for (;;) {
 740                 l = strcspn(p, "\n");
 741                 fprintf(fp, " *");
 742                 if (l) {
 743                         fprintf(fp, " ");
 744                         xfwrite(p, l, 1, fp);
 745                         p += l;
 746                 }
 747                 fprintf(fp, "\n");
 748                 if (*p++ == '\0')
 749                         break;
 750         }
 751         fprintf(fp, " */\n");
 752 }
 753
 754 static struct conf_printer header_printer_cb =
 755 {
 756         .print_symbol = header_print_symbol,
 757         .print_comment = header_print_comment,
 758 };
 759
 760 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 761                               struct conf_printer *printer, void *printer_arg)
 762 {
 763         const char *str;
 764
 765         switch (sym->type) {
 766         case S_UNKNOWN:
 767                 break;
 768         case S_STRING:
 769                 str = sym_get_string_value(sym);
 770                 str = sym_escape_string_value(str);
 771                 printer->print_symbol(fp, sym, str, printer_arg);
 772                 free((void *)str);
 773                 break;
 774         default:
 775                 str = sym_get_string_value(sym);
 776                 printer->print_symbol(fp, sym, str, printer_arg);
 777         }
 778 }
 779
 780 static void
 781 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 782 {
 783         char buf[256];
 784
 785         snprintf(buf, sizeof(buf),
 786             "\n"
 787             "Automatically generated file; DO NOT EDIT.\n"
 788             "%s\n",
 789             rootmenu.prompt->text);
 790
 791         printer->print_comment(fp, buf, printer_arg);
 792 }
 793
 794 /*
 795  * Write out a minimal config.
 796  * All values that has default values are skipped as this is redundant.
 797  */
 798 int conf_write_defconfig(const char *filename)
 799 {
 800         struct symbol *sym;
 801         struct menu *menu;
 802         FILE *out;
 803
 804         out = fopen(filename, "w");
 805         if (!out)
 806                 return 1;
 807
 808         sym_clear_all_valid();
 809
 810         /* Traverse all menus to find all relevant symbols */
 811         menu = rootmenu.list;
 812
 813         while (menu != NULL)
 814         {
 815                 sym = menu->sym;
 816                 if (sym == NULL) {
 817                         if (!menu_is_visible(menu))
 818                                 goto next_menu;
 819                 } else if (!sym_is_choice(sym)) {
 820                         sym_calc_value(sym);
 821                         if (!(sym->flags & SYMBOL_WRITE))
 822                                 goto next_menu;
 823                         sym->flags &= ~SYMBOL_WRITE;
 824                         /* If we cannot change the symbol - skip */
 825                         if (!sym_is_changeable(sym))
 826                                 goto next_menu;
 827                         /* If symbol equals to default value - skip */
 828                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 829                                 goto next_menu;
 830
 831                         /*
 832                          * If symbol is a choice value and equals to the
 833                          * default for a choice - skip.
 834                          * But only if value is bool and equal to "y" and
 835                          * choice is not "optional".
 836                          * (If choice is "optional" then all values can be "n")
 837                          */
 838                         if (sym_is_choice_value(sym)) {
 839                                 struct symbol *cs;
 840                                 struct symbol *ds;
 841
 842                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 843                                 ds = sym_choice_default(cs);
 844                                 if (!sym_is_optional(cs) && sym == ds) {
 845                                         if ((sym->type == S_BOOLEAN) &&
 846                                             sym_get_tristate_value(sym) == yes)
 847                                                 goto next_menu;
 848                                 }
 849                         }
 850                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 851                 }
 852 next_menu:
 853                 if (menu->list != NULL) {
 854                         menu = menu->list;
 855                 }
 856                 else if (menu->next != NULL) {
 857                         menu = menu->next;
 858                 } else {
 859                         while ((menu = menu->parent)) {
 860                                 if (menu->next != NULL) {
 861                                         menu = menu->next;
 862                                         break;
 863                                 }
 864                         }
 865                 }
 866         }
 867         fclose(out);
 868         return 0;
 869 }
 870
 871 int conf_write(const char *name)
 872 {
 873         FILE *out;
 874         struct symbol *sym;
 875         struct menu *menu;
 876         const char *str;
 877         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 878         char *env;
 879         int i;
 880         bool need_newline = false;
 881
 882         if (!name)
 883                 name = conf_get_configname();
 884
 885         if (!*name) {
 886                 fprintf(stderr, "config name is empty\n");
 887                 return -1;
 888         }
 889
 890         if (is_dir(name)) {
 891                 fprintf(stderr, "%s: Is a directory\n", name);
 892                 return -1;
 893         }
 894
 895         if (make_parent_dir(name))
 896                 return -1;
 897
 898         env = getenv("KCONFIG_OVERWRITECONFIG");
 899         if (env && *env) {
 900                 *tmpname = 0;
 901                 out = fopen(name, "w");
 902         } else {
 903                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 904                          name, (int)getpid());
 905                 out = fopen(tmpname, "w");
 906         }
 907         if (!out)
 908                 return 1;
 909
 910         conf_write_heading(out, &kconfig_printer_cb, NULL);
 911
 912         if (!conf_get_changed())
 913                 sym_clear_all_valid();
 914
 915         menu = rootmenu.list;
 916         while (menu) {
 917                 sym = menu->sym;
 918                 if (!sym) {
 919                         if (!menu_is_visible(menu))
 920                                 goto next;
 921                         str = menu_get_prompt(menu);
 922                         fprintf(out, "\n"
 923                                      "#\n"
 924                                      "# %s\n"
 925                                      "#\n", str);
 926                         need_newline = false;
 927                 } else if (!(sym->flags & SYMBOL_CHOICE) &&
 928                            !(sym->flags & SYMBOL_WRITTEN)) {
 929                         sym_calc_value(sym);
 930                         if (!(sym->flags & SYMBOL_WRITE))
 931                                 goto next;
 932                         if (need_newline) {
 933                                 fprintf(out, "\n");
 934                                 need_newline = false;
 935                         }
 936                         sym->flags |= SYMBOL_WRITTEN;
 937                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 938                 }
 939
 940 next:
 941                 if (menu->list) {
 942                         menu = menu->list;
 943                         continue;
 944                 }
 945                 if (menu->next)
 946                         menu = menu->next;
 947                 else while ((menu = menu->parent)) {
 948                         if (!menu->sym && menu_is_visible(menu) &&
 949                             menu != &rootmenu) {
 950                                 str = menu_get_prompt(menu);
 951                                 fprintf(out, "# end of %s\n", str);
 952                                 need_newline = true;
 953                         }
 954                         if (menu->next) {
 955                                 menu = menu->next;
 956                                 break;
 957                         }
 958                 }
 959         }
 960         fclose(out);
 961
 962         for_all_symbols(i, sym)
 963                 sym->flags &= ~SYMBOL_WRITTEN;
 964
 965         if (*tmpname) {
 966                 if (is_same(name, tmpname)) {
 967                         conf_message("No change to %s", name);
 968                         unlink(tmpname);
 969                         sym_set_change_count(0);
 970                         return 0;
 971                 }
 972
 973                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 974                 rename(name, oldname);
 975                 if (rename(tmpname, name))
 976                         return 1;
 977         }
 978
 979         conf_message("configuration written to %s", name);
 980
 981         sym_set_change_count(0);
 982
 983         return 0;
 984 }
 985
 986 /* write a dependency file as used by kbuild to track dependencies */
 987 static int conf_write_dep(const char *name)
 988 {
 989         struct file *file;
 990         FILE *out;
 991
 992         out = fopen("..config.tmp", "w");
 993         if (!out)
 994                 return 1;
 995         fprintf(out, "deps_config := \\\n");
 996         for (file = file_list; file; file = file->next) {
 997                 if (file->next)
 998                         fprintf(out, "\t%s \\\n", file->name);
 999                 else
1000                         fprintf(out, "\t%s\n", file->name);
1001         }
1002         fprintf(out, "\n%s: \\\n"
1003                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
1004
1005         env_write_dep(out, conf_get_autoconfig_name());
1006
1007         fprintf(out, "\n$(deps_config): ;\n");
1008         fclose(out);
1009
1010         if (make_parent_dir(name))
1011                 return 1;
1012         rename("..config.tmp", name);
1013         return 0;
1014 }
1015
1016 static int conf_touch_deps(void)
1017 {
1018         const char *name;
1019         struct symbol *sym;
1020         int res, i;
1021
1022         strcpy(depfile_path, "include/generated/");
1023         depfile_prefix_len = strlen(depfile_path);
1024
1025         name = conf_get_autoconfig_name();
1026         conf_read_simple(name, S_DEF_AUTO);
1027         sym_calc_value(modules_sym);
1028
1029         for_all_symbols(i, sym) {
1030                 sym_calc_value(sym);
1031                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1032                         continue;
1033                 if (sym->flags & SYMBOL_WRITE) {
1034                         if (sym->flags & SYMBOL_DEF_AUTO) {
1035                                 /*
1036                                  * symbol has old and new value,
1037                                  * so compare them...
1038                                  */
1039                                 switch (sym->type) {
1040                                 case S_BOOLEAN:
1041                                 case S_TRISTATE:
1042                                         if (sym_get_tristate_value(sym) ==
1043                                             sym->def[S_DEF_AUTO].tri)
1044                                                 continue;
1045                                         break;
1046                                 case S_STRING:
1047                                 case S_HEX:
1048                                 case S_INT:
1049                                         if (!strcmp(sym_get_string_value(sym),
1050                                                     sym->def[S_DEF_AUTO].val))
1051                                                 continue;
1052                                         break;
1053                                 default:
1054                                         break;
1055                                 }
1056                         } else {
1057                                 /*
1058                                  * If there is no old value, only 'no' (unset)
1059                                  * is allowed as new value.
1060                                  */
1061                                 switch (sym->type) {
1062                                 case S_BOOLEAN:
1063                                 case S_TRISTATE:
1064                                         if (sym_get_tristate_value(sym) == no)
1065                                                 continue;
1066                                         break;
1067                                 default:
1068                                         break;
1069                                 }
1070                         }
1071                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1072                         /* There is neither an old nor a new value. */
1073                         continue;
1074                 /* else
1075                  *      There is an old value, but no new value ('no' (unset)
1076                  *      isn't saved in auto.conf, so the old value is always
1077                  *      different from 'no').
1078                  */
1079
1080                 res = conf_touch_dep(sym->name);
1081                 if (res)
1082                         return res;
1083         }
1084
1085         return 0;
1086 }
1087
1088 int conf_write_autoconf(int overwrite)
1089 {
1090         struct symbol *sym;
1091         const char *name;
1092         const char *autoconf_name = conf_get_autoconfig_name();
1093         FILE *out, *out_h, *out_c;
1094         int i;
1095
1096         if (!overwrite && is_present(autoconf_name))
1097                 return 0;
1098
1099         conf_write_dep("include/generated/auto.conf.cmd");
1100
1101         if (conf_touch_deps())
1102                 return 1;
1103
1104         out = fopen(".tmpconfig", "w");
1105         if (!out)
1106                 return 1;
1107
1108         out_h = fopen(".tmpconfig.h", "w");
1109         if (!out_h) {
1110                 fclose(out);
1111                 return 1;
1112         }
1113
1114         out_c = fopen(".tmpconfig.cmake", "w");
1115         if (!out_c) {
1116                 fclose(out);
1117                 fclose(out_h);
1118         }
1119
1120         conf_write_heading(out, &kconfig_printer_cb, NULL);
1121
1122         conf_write_heading(out_h, &header_printer_cb, NULL);
1123
1124         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1125
1126         for_all_symbols(i, sym) {
1127                 sym_calc_value(sym);
1128                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1129                         continue;
1130
1131                 /* write symbol to auto.conf and header files */
1132                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1133
1134                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1135
1136                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1137         }
1138         fclose(out);
1139         fclose(out_h);
1140         fclose(out_c);
1141
1142         name = getenv("KCONFIG_AUTOHEADER");
1143         if (!name)
1144                 name = "include/generated/autoconf.h";
1145         if (make_parent_dir(name))
1146                 return 1;
1147         if (rename(".tmpconfig.h", name))
1148                 return 1;
1149
1150         if (make_parent_dir(autoconf_name))
1151                 return 1;
1152
1153         name = getenv("KCONFIG_CMAKE");
1154         if (!name)
1155                 name = "config.cmake";
1156         if (make_parent_dir(name))
1157                 return 1;
1158         if (rename(".tmpconfig.cmake", name))
1159                 return 1;
1160
1161         /*
1162          * This must be the last step, kbuild has a dependency on auto.conf
1163          * and this marks the successful completion of the previous steps.
1164          */
1165         if (rename(".tmpconfig", autoconf_name))
1166                 return 1;
1167
1168         return 0;
1169 }
1170
1171 static int sym_change_count;
1172 static void (*conf_changed_callback)(void);
1173
1174 void sym_set_change_count(int count)
1175 {
1176         int _sym_change_count = sym_change_count;
1177         sym_change_count = count;
1178         if (conf_changed_callback &&
1179             (bool)_sym_change_count != (bool)count)
1180                 conf_changed_callback();
1181 }
1182
1183 void sym_add_change_count(int count)
1184 {
1185         sym_set_change_count(count + sym_change_count);
1186 }
1187
1188 bool conf_get_changed(void)
1189 {
1190         return sym_change_count;
1191 }
1192
1193 void conf_set_changed_callback(void (*fn)(void))
1194 {
1195         conf_changed_callback = fn;
1196 }
1197
1198 static bool randomize_choice_values(struct symbol *csym)
1199 {
1200         struct property *prop;
1201         struct symbol *sym;
1202         struct expr *e;
1203         int cnt, def;
1204
1205         /*
1206          * If choice is mod then we may have more items selected
1207          * and if no then no-one.
1208          * In both cases stop.
1209          */
1210         if (csym->curr.tri != yes)
1211                 return false;
1212
1213         prop = sym_get_choice_prop(csym);
1214
1215         /* count entries in choice block */
1216         cnt = 0;
1217         expr_list_for_each_sym(prop->expr, e, sym)
1218                 cnt++;
1219
1220         /*
1221          * find a random value and set it to yes,
1222          * set the rest to no so we have only one set
1223          */
1224         def = (rand() % cnt);
1225
1226         cnt = 0;
1227         expr_list_for_each_sym(prop->expr, e, sym) {
1228                 if (def == cnt++) {
1229                         sym->def[S_DEF_USER].tri = yes;
1230                         csym->def[S_DEF_USER].val = sym;
1231                 }
1232                 else {
1233                         sym->def[S_DEF_USER].tri = no;
1234                 }
1235                 sym->flags |= SYMBOL_DEF_USER;
1236                 /* clear VALID to get value calculated */
1237                 sym->flags &= ~SYMBOL_VALID;
1238         }
1239         csym->flags |= SYMBOL_DEF_USER;
1240         /* clear VALID to get value calculated */
1241         csym->flags &= ~(SYMBOL_VALID);
1242
1243         return true;
1244 }
1245
1246 void set_all_choice_values(struct symbol *csym)
1247 {
1248         struct property *prop;
1249         struct symbol *sym;
1250         struct expr *e;
1251
1252         prop = sym_get_choice_prop(csym);
1253
1254         /*
1255          * Set all non-assinged choice values to no
1256          */
1257         expr_list_for_each_sym(prop->expr, e, sym) {
1258                 if (!sym_has_value(sym))
1259                         sym->def[S_DEF_USER].tri = no;
1260         }
1261         csym->flags |= SYMBOL_DEF_USER;
1262         /* clear VALID to get value calculated */
1263         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1264 }
1265
1266 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1267 {
1268         struct symbol *sym, *csym;
1269         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1270                                          * pty: probability of tristate = y
1271                                          * ptm: probability of tristate = m
1272                                          */
1273
1274         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1275                                    * below, otherwise gcc whines about
1276                                    * -Wmaybe-uninitialized */
1277         if (mode == def_random) {
1278                 int n, p[3];
1279                 char *env = getenv("KCONFIG_PROBABILITY");
1280                 n = 0;
1281                 while( env && *env ) {
1282                         char *endp;
1283                         int tmp = strtol( env, &endp, 10 );
1284                         if( tmp >= 0 && tmp <= 100 ) {
1285                                 p[n++] = tmp;
1286                         } else {
1287                                 errno = ERANGE;
1288                                 perror( "KCONFIG_PROBABILITY" );
1289                                 exit( 1 );
1290                         }
1291                         env = (*endp == ':') ? endp+1 : endp;
1292                         if( n >=3 ) {
1293                                 break;
1294                         }
1295                 }
1296                 switch( n ) {
1297                 case 1:
1298                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1299                         break;
1300                 case 2:
1301                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1302                         break;
1303                 case 3:
1304                         pby = p[0]; pty = p[1]; ptm = p[2];
1305                         break;
1306                 }
1307
1308                 if( pty+ptm > 100 ) {
1309                         errno = ERANGE;
1310                         perror( "KCONFIG_PROBABILITY" );
1311                         exit( 1 );
1312                 }
1313         }
1314         bool has_changed = false;
1315
1316         for_all_symbols(i, sym) {
1317                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1318                         continue;
1319                 switch (sym_get_type(sym)) {
1320                 case S_BOOLEAN:
1321                 case S_TRISTATE:
1322                         has_changed = true;
1323                         switch (mode) {
1324                         case def_yes:
1325                                 sym->def[S_DEF_USER].tri = yes;
1326                                 break;
1327                         case def_mod:
1328                                 sym->def[S_DEF_USER].tri = mod;
1329                                 break;
1330                         case def_no:
1331                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1332                                         sym->def[S_DEF_USER].tri = yes;
1333                                 else
1334                                         sym->def[S_DEF_USER].tri = no;
1335                                 break;
1336                         case def_random:
1337                                 sym->def[S_DEF_USER].tri = no;
1338                                 cnt = rand() % 100;
1339                                 if (sym->type == S_TRISTATE) {
1340                                         if (cnt < pty)
1341                                                 sym->def[S_DEF_USER].tri = yes;
1342                                         else if (cnt < (pty+ptm))
1343                                                 sym->def[S_DEF_USER].tri = mod;
1344                                 } else if (cnt < pby)
1345                                         sym->def[S_DEF_USER].tri = yes;
1346                                 break;
1347                         default:
1348                                 continue;
1349                         }
1350                         if (!(sym_is_choice(sym) && mode == def_random))
1351                                 sym->flags |= SYMBOL_DEF_USER;
1352                         break;
1353                 default:
1354                         break;
1355                 }
1356
1357         }
1358
1359         sym_clear_all_valid();
1360
1361         /*
1362          * We have different type of choice blocks.
1363          * If curr.tri equals to mod then we can select several
1364          * choice symbols in one block.
1365          * In this case we do nothing.
1366          * If curr.tri equals yes then only one symbol can be
1367          * selected in a choice block and we set it to yes,
1368          * and the rest to no.
1369          */
1370         if (mode != def_random) {
1371                 for_all_symbols(i, csym) {
1372                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1373                             sym_is_choice_value(csym))
1374                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1375                 }
1376         }
1377
1378         for_all_symbols(i, csym) {
1379                 if (sym_has_value(csym) || !sym_is_choice(csym))
1380                         continue;
1381
1382                 sym_calc_value(csym);
1383                 if (mode == def_random)
1384                         has_changed |= randomize_choice_values(csym);
1385                 else {
1386                         set_all_choice_values(csym);
1387                         has_changed = true;
1388                 }
1389         }
1390
1391         return has_changed;
1392 }
1393
1394 void conf_rewrite_mod_or_yes(enum conf_def_mode mode)
1395 {
1396         struct symbol *sym;
1397         int i;
1398         tristate old_val = (mode == def_y2m) ? yes : mod;
1399         tristate new_val = (mode == def_y2m) ? mod : yes;
1400
1401         for_all_symbols(i, sym) {
1402                 if (sym_get_type(sym) == S_TRISTATE &&
1403                     sym->def[S_DEF_USER].tri == old_val)
1404                         sym->def[S_DEF_USER].tri = new_val;
1405         }
1406         sym_clear_all_valid();
1407 }