scripts/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 <ctype.h>
   9 #include <errno.h>
  10 #include <fcntl.h>
  11 #include <limits.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <time.h>
  17 #include <unistd.h>
  18
  19 #include "lkc.h"
  20
  21 /* return true if 'path' exists, false otherwise */
  22 static bool is_present(const char *path)
  23 {
  24         struct stat st;
  25
  26         return !stat(path, &st);
  27 }
  28
  29 /* return true if 'path' exists and it is a directory, false otherwise */
  30 static bool is_dir(const char *path)
  31 {
  32         struct stat st;
  33
  34         if (stat(path, &st))
  35                 return 0;
  36
  37         return S_ISDIR(st.st_mode);
  38 }
  39
  40 /* return true if the given two files are the same, false otherwise */
  41 static bool is_same(const char *file1, const char *file2)
  42 {
  43         int fd1, fd2;
  44         struct stat st1, st2;
  45         void *map1, *map2;
  46         bool ret = false;
  47
  48         fd1 = open(file1, O_RDONLY);
  49         if (fd1 < 0)
  50                 return ret;
  51
  52         fd2 = open(file2, O_RDONLY);
  53         if (fd2 < 0)
  54                 goto close1;
  55
  56         ret = fstat(fd1, &st1);
  57         if (ret)
  58                 goto close2;
  59         ret = fstat(fd2, &st2);
  60         if (ret)
  61                 goto close2;
  62
  63         if (st1.st_size != st2.st_size)
  64                 goto close2;
  65
  66         map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
  67         if (map1 == MAP_FAILED)
  68                 goto close2;
  69
  70         map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
  71         if (map2 == MAP_FAILED)
  72                 goto close2;
  73
  74         if (bcmp(map1, map2, st1.st_size))
  75                 goto close2;
  76
  77         ret = true;
  78 close2:
  79         close(fd2);
  80 close1:
  81         close(fd1);
  82
  83         return ret;
  84 }
  85
  86 /*
  87  * Create the parent directory of the given path.
  88  *
  89  * For example, if 'include/config/auto.conf' is given, create 'include/config'.
  90  */
  91 static int make_parent_dir(const char *path)
  92 {
  93         char tmp[PATH_MAX + 1];
  94         char *p;
  95
  96         strncpy(tmp, path, sizeof(tmp));
  97         tmp[sizeof(tmp) - 1] = 0;
  98
  99         /* Remove the base name. Just return if nothing is left */
 100         p = strrchr(tmp, '/');
 101         if (!p)
 102                 return 0;
 103         *(p + 1) = 0;
 104
 105         /* Just in case it is an absolute path */
 106         p = tmp;
 107         while (*p == '/')
 108                 p++;
 109
 110         while ((p = strchr(p, '/'))) {
 111                 *p = 0;
 112
 113                 /* skip if the directory exists */
 114                 if (!is_dir(tmp) && mkdir(tmp, 0755))
 115                         return -1;
 116
 117                 *p = '/';
 118                 while (*p == '/')
 119                         p++;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static char depfile_path[PATH_MAX];
 126 static size_t depfile_prefix_len;
 127
 128 /* touch depfile for symbol 'name' */
 129 static int conf_touch_dep(const char *name)
 130 {
 131         int fd, ret;
 132         const char *s;
 133         char *d, c;
 134
 135         /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
 136         if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
 137                 return -1;
 138
 139         d = depfile_path + depfile_prefix_len;
 140         s = name;
 141
 142         while ((c = *s++))
 143                 *d++ = (c == '_') ? '/' : tolower(c);
 144         strcpy(d, ".h");
 145
 146         /* Assume directory path already exists. */
 147         fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 148         if (fd == -1) {
 149                 if (errno != ENOENT)
 150                         return -1;
 151
 152                 ret = make_parent_dir(depfile_path);
 153                 if (ret)
 154                         return ret;
 155
 156                 /* Try it again. */
 157                 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 158                 if (fd == -1)
 159                         return -1;
 160         }
 161         close(fd);
 162
 163         return 0;
 164 }
 165
 166 struct conf_printer {
 167         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
 168         void (*print_comment)(FILE *, const char *, void *);
 169 };
 170
 171 static void conf_warning(const char *fmt, ...)
 172         __attribute__ ((format (printf, 1, 2)));
 173
 174 static void conf_message(const char *fmt, ...)
 175         __attribute__ ((format (printf, 1, 2)));
 176
 177 static const char *conf_filename;
 178 static int conf_lineno, conf_warnings;
 179
 180 static void conf_warning(const char *fmt, ...)
 181 {
 182         va_list ap;
 183         va_start(ap, fmt);
 184         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
 185         vfprintf(stderr, fmt, ap);
 186         fprintf(stderr, "\n");
 187         va_end(ap);
 188         conf_warnings++;
 189 }
 190
 191 static void conf_default_message_callback(const char *s)
 192 {
 193         printf("#\n# ");
 194         printf("%s", s);
 195         printf("\n#\n");
 196 }
 197
 198 static void (*conf_message_callback)(const char *s) =
 199         conf_default_message_callback;
 200 void conf_set_message_callback(void (*fn)(const char *s))
 201 {
 202         conf_message_callback = fn;
 203 }
 204
 205 static void conf_message(const char *fmt, ...)
 206 {
 207         va_list ap;
 208         char buf[4096];
 209
 210         if (!conf_message_callback)
 211                 return;
 212
 213         va_start(ap, fmt);
 214
 215         vsnprintf(buf, sizeof(buf), fmt, ap);
 216         conf_message_callback(buf);
 217         va_end(ap);
 218 }
 219
 220 const char *conf_get_configname(void)
 221 {
 222         char *name = getenv("KCONFIG_CONFIG");
 223
 224         return name ? name : ".config";
 225 }
 226
 227 static const char *conf_get_autoconfig_name(void)
 228 {
 229         char *name = getenv("KCONFIG_AUTOCONFIG");
 230
 231         return name ? name : "include/config/auto.conf";
 232 }
 233
 234 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 235 {
 236         char *p2;
 237
 238         switch (sym->type) {
 239         case S_TRISTATE:
 240                 if (p[0] == 'm') {
 241                         sym->def[def].tri = mod;
 242                         sym->flags |= def_flags;
 243                         break;
 244                 }
 245                 /* fall through */
 246         case S_BOOLEAN:
 247                 if (p[0] == 'y') {
 248                         sym->def[def].tri = yes;
 249                         sym->flags |= def_flags;
 250                         break;
 251                 }
 252                 if (p[0] == 'n') {
 253                         sym->def[def].tri = no;
 254                         sym->flags |= def_flags;
 255                         break;
 256                 }
 257                 if (def != S_DEF_AUTO)
 258                         conf_warning("symbol value '%s' invalid for %s",
 259                                      p, sym->name);
 260                 return 1;
 261         case S_STRING:
 262                 if (*p++ != '"')
 263                         break;
 264                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 265                         if (*p2 == '"') {
 266                                 *p2 = 0;
 267                                 break;
 268                         }
 269                         memmove(p2, p2 + 1, strlen(p2));
 270                 }
 271                 if (!p2) {
 272                         if (def != S_DEF_AUTO)
 273                                 conf_warning("invalid string found");
 274                         return 1;
 275                 }
 276                 /* fall through */
 277         case S_INT:
 278         case S_HEX:
 279                 if (sym_string_valid(sym, p)) {
 280                         sym->def[def].val = xstrdup(p);
 281                         sym->flags |= def_flags;
 282                 } else {
 283                         if (def != S_DEF_AUTO)
 284                                 conf_warning("symbol value '%s' invalid for %s",
 285                                              p, sym->name);
 286                         return 1;
 287                 }
 288                 break;
 289         default:
 290                 ;
 291         }
 292         return 0;
 293 }
 294
 295 #define LINE_GROWTH 16
 296 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 297 {
 298         char *nline;
 299         size_t new_size = slen + 1;
 300         if (new_size > *n) {
 301                 new_size += LINE_GROWTH - 1;
 302                 new_size *= 2;
 303                 nline = xrealloc(*lineptr, new_size);
 304                 if (!nline)
 305                         return -1;
 306
 307                 *lineptr = nline;
 308                 *n = new_size;
 309         }
 310
 311         (*lineptr)[slen] = c;
 312
 313         return 0;
 314 }
 315
 316 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 317 {
 318         char *line = *lineptr;
 319         size_t slen = 0;
 320
 321         for (;;) {
 322                 int c = getc(stream);
 323
 324                 switch (c) {
 325                 case '\n':
 326                         if (add_byte(c, &line, slen, n) < 0)
 327                                 goto e_out;
 328                         slen++;
 329                         /* fall through */
 330                 case EOF:
 331                         if (add_byte('\0', &line, slen, n) < 0)
 332                                 goto e_out;
 333                         *lineptr = line;
 334                         if (slen == 0)
 335                                 return -1;
 336                         return slen;
 337                 default:
 338                         if (add_byte(c, &line, slen, n) < 0)
 339                                 goto e_out;
 340                         slen++;
 341                 }
 342         }
 343
 344 e_out:
 345         line[slen-1] = '\0';
 346         *lineptr = line;
 347         return -1;
 348 }
 349
 350 void conf_reset(int def)
 351 {
 352         struct symbol *sym;
 353         int i, def_flags;
 354
 355         def_flags = SYMBOL_DEF << def;
 356         for_all_symbols(i, sym) {
 357                 sym->flags |= SYMBOL_CHANGED;
 358                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 359                 if (sym_is_choice(sym))
 360                         sym->flags |= def_flags;
 361                 switch (sym->type) {
 362                 case S_INT:
 363                 case S_HEX:
 364                 case S_STRING:
 365                         if (sym->def[def].val)
 366                                 free(sym->def[def].val);
 367                         /* fall through */
 368                 default:
 369                         sym->def[def].val = NULL;
 370                         sym->def[def].tri = no;
 371                 }
 372         }
 373 }
 374
 375 int conf_read_simple(const char *name, int def)
 376 {
 377         FILE *in = NULL;
 378         char   *line = NULL;
 379         size_t  line_asize = 0;
 380         char *p, *p2;
 381         struct symbol *sym;
 382         int def_flags;
 383
 384         if (name) {
 385                 in = zconf_fopen(name);
 386         } else {
 387                 struct property *prop;
 388
 389                 name = conf_get_configname();
 390                 in = zconf_fopen(name);
 391                 if (in)
 392                         goto load;
 393                 sym_add_change_count(1);
 394                 if (!sym_defconfig_list)
 395                         return 1;
 396
 397                 for_all_defaults(sym_defconfig_list, prop) {
 398                         if (expr_calc_value(prop->visible.expr) == no ||
 399                             prop->expr->type != E_SYMBOL)
 400                                 continue;
 401                         sym_calc_value(prop->expr->left.sym);
 402                         name = sym_get_string_value(prop->expr->left.sym);
 403                         in = zconf_fopen(name);
 404                         if (in) {
 405                                 conf_message("using defaults found in %s",
 406                                          name);
 407                                 goto load;
 408                         }
 409                 }
 410         }
 411         if (!in)
 412                 return 1;
 413
 414 load:
 415         conf_filename = name;
 416         conf_lineno = 0;
 417         conf_warnings = 0;
 418
 419         def_flags = SYMBOL_DEF << def;
 420         conf_reset(def);
 421
 422         while (compat_getline(&line, &line_asize, in) != -1) {
 423                 conf_lineno++;
 424                 sym = NULL;
 425                 if (line[0] == '#') {
 426                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 427                                 continue;
 428                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 429                         if (!p)
 430                                 continue;
 431                         *p++ = 0;
 432                         if (strncmp(p, "is not set", 10))
 433                                 continue;
 434                         if (def == S_DEF_USER) {
 435                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 436                                 if (!sym) {
 437                                         sym_add_change_count(1);
 438                                         continue;
 439                                 }
 440                         } else {
 441                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 442                                 if (sym->type == S_UNKNOWN)
 443                                         sym->type = S_BOOLEAN;
 444                         }
 445                         switch (sym->type) {
 446                         case S_BOOLEAN:
 447                         case S_TRISTATE:
 448                                 sym->def[def].tri = no;
 449                                 sym->flags |= def_flags;
 450                                 break;
 451                         default:
 452                                 ;
 453                         }
 454                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 455                         p = strchr(line + strlen(CONFIG_), '=');
 456                         if (!p)
 457                                 continue;
 458                         *p++ = 0;
 459                         p2 = strchr(p, '\n');
 460                         if (p2) {
 461                                 *p2-- = 0;
 462                                 if (*p2 == '\r')
 463                                         *p2 = 0;
 464                         }
 465
 466                         sym = sym_find(line + strlen(CONFIG_));
 467                         if (!sym) {
 468                                 if (def == S_DEF_AUTO)
 469                                         /*
 470                                          * Reading from include/config/auto.conf
 471                                          * If CONFIG_FOO previously existed in
 472                                          * auto.conf but it is missing now,
 473                                          * include/config/foo.h must be touched.
 474                                          */
 475                                         conf_touch_dep(line + strlen(CONFIG_));
 476                                 else
 477                                         sym_add_change_count(1);
 478                                 continue;
 479                         }
 480
 481                         if (conf_set_sym_val(sym, def, def_flags, p))
 482                                 continue;
 483                 } else {
 484                         if (line[0] != '\r' && line[0] != '\n')
 485                                 conf_warning("unexpected data: %.*s",
 486                                              (int)strcspn(line, "\r\n"), line);
 487
 488                         continue;
 489                 }
 490
 491                 if (sym && sym_is_choice_value(sym)) {
 492                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 493                         switch (sym->def[def].tri) {
 494                         case no:
 495                                 break;
 496                         case mod:
 497                                 if (cs->def[def].tri == yes) {
 498                                         conf_warning("%s creates inconsistent choice state", sym->name);
 499                                         cs->flags &= ~def_flags;
 500                                 }
 501                                 break;
 502                         case yes:
 503                                 if (cs->def[def].tri != no)
 504                                         conf_warning("override: %s changes choice state", sym->name);
 505                                 cs->def[def].val = sym;
 506                                 break;
 507                         }
 508                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 509                 }
 510         }
 511         free(line);
 512         fclose(in);
 513         return 0;
 514 }
 515
 516 int conf_read(const char *name)
 517 {
 518         struct symbol *sym;
 519         int conf_unsaved = 0;
 520         int i;
 521
 522         sym_set_change_count(0);
 523
 524         if (conf_read_simple(name, S_DEF_USER)) {
 525                 sym_calc_value(modules_sym);
 526                 return 1;
 527         }
 528
 529         sym_calc_value(modules_sym);
 530
 531         for_all_symbols(i, sym) {
 532                 sym_calc_value(sym);
 533                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 534                         continue;
 535                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 536                         /* check that calculated value agrees with saved value */
 537                         switch (sym->type) {
 538                         case S_BOOLEAN:
 539                         case S_TRISTATE:
 540                                 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
 541                                         continue;
 542                                 break;
 543                         default:
 544                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 545                                         continue;
 546                                 break;
 547                         }
 548                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 549                         /* no previous value and not saved */
 550                         continue;
 551                 conf_unsaved++;
 552                 /* maybe print value in verbose mode... */
 553         }
 554
 555         for_all_symbols(i, sym) {
 556                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 557                         /* Reset values of generates values, so they'll appear
 558                          * as new, if they should become visible, but that
 559                          * doesn't quite work if the Kconfig and the saved
 560                          * configuration disagree.
 561                          */
 562                         if (sym->visible == no && !conf_unsaved)
 563                                 sym->flags &= ~SYMBOL_DEF_USER;
 564                         switch (sym->type) {
 565                         case S_STRING:
 566                         case S_INT:
 567                         case S_HEX:
 568                                 /* Reset a string value if it's out of range */
 569                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 570                                         break;
 571                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 572                                 conf_unsaved++;
 573                                 break;
 574                         default:
 575                                 break;
 576                         }
 577                 }
 578         }
 579
 580         sym_add_change_count(conf_warnings || conf_unsaved);
 581
 582         return 0;
 583 }
 584
 585 /*
 586  * Kconfig configuration printer
 587  *
 588  * This printer is used when generating the resulting configuration after
 589  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 590  * passing a non-NULL argument to the printer.
 591  *
 592  */
 593 static void
 594 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 595 {
 596
 597         switch (sym->type) {
 598         case S_BOOLEAN:
 599         case S_TRISTATE:
 600                 if (*value == 'n') {
 601                         bool skip_unset = (arg != NULL);
 602
 603                         if (!skip_unset)
 604                                 fprintf(fp, "# %s%s is not set\n",
 605                                     CONFIG_, sym->name);
 606                         return;
 607                 }
 608                 break;
 609         default:
 610                 break;
 611         }
 612
 613         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 614 }
 615
 616 static void
 617 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 618 {
 619         const char *p = value;
 620         size_t l;
 621
 622         for (;;) {
 623                 l = strcspn(p, "\n");
 624                 fprintf(fp, "#");
 625                 if (l) {
 626                         fprintf(fp, " ");
 627                         xfwrite(p, l, 1, fp);
 628                         p += l;
 629                 }
 630                 fprintf(fp, "\n");
 631                 if (*p++ == '\0')
 632                         break;
 633         }
 634 }
 635
 636 static struct conf_printer kconfig_printer_cb =
 637 {
 638         .print_symbol = kconfig_print_symbol,
 639         .print_comment = kconfig_print_comment,
 640 };
 641
 642 /*
 643  * Header printer
 644  *
 645  * This printer is used when generating the `include/generated/autoconf.h' file.
 646  */
 647 static void
 648 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 649 {
 650
 651         switch (sym->type) {
 652         case S_BOOLEAN:
 653         case S_TRISTATE: {
 654                 const char *suffix = "";
 655
 656                 switch (*value) {
 657                 case 'n':
 658                         break;
 659                 case 'm':
 660                         suffix = "_MODULE";
 661                         /* fall through */
 662                 default:
 663                         fprintf(fp, "#define %s%s%s 1\n",
 664                             CONFIG_, sym->name, suffix);
 665                 }
 666                 break;
 667         }
 668         case S_HEX: {
 669                 const char *prefix = "";
 670
 671                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 672                         prefix = "0x";
 673                 fprintf(fp, "#define %s%s %s%s\n",
 674                     CONFIG_, sym->name, prefix, value);
 675                 break;
 676         }
 677         case S_STRING:
 678         case S_INT:
 679                 fprintf(fp, "#define %s%s %s\n",
 680                     CONFIG_, sym->name, value);
 681                 break;
 682         default:
 683                 break;
 684         }
 685
 686 }
 687
 688 static void
 689 header_print_comment(FILE *fp, const char *value, void *arg)
 690 {
 691         const char *p = value;
 692         size_t l;
 693
 694         fprintf(fp, "/*\n");
 695         for (;;) {
 696                 l = strcspn(p, "\n");
 697                 fprintf(fp, " *");
 698                 if (l) {
 699                         fprintf(fp, " ");
 700                         xfwrite(p, l, 1, fp);
 701                         p += l;
 702                 }
 703                 fprintf(fp, "\n");
 704                 if (*p++ == '\0')
 705                         break;
 706         }
 707         fprintf(fp, " */\n");
 708 }
 709
 710 static struct conf_printer header_printer_cb =
 711 {
 712         .print_symbol = header_print_symbol,
 713         .print_comment = header_print_comment,
 714 };
 715
 716 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 717                               struct conf_printer *printer, void *printer_arg)
 718 {
 719         const char *str;
 720
 721         switch (sym->type) {
 722         case S_UNKNOWN:
 723                 break;
 724         case S_STRING:
 725                 str = sym_get_string_value(sym);
 726                 str = sym_escape_string_value(str);
 727                 printer->print_symbol(fp, sym, str, printer_arg);
 728                 free((void *)str);
 729                 break;
 730         default:
 731                 str = sym_get_string_value(sym);
 732                 printer->print_symbol(fp, sym, str, printer_arg);
 733         }
 734 }
 735
 736 static void
 737 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 738 {
 739         char buf[256];
 740
 741         snprintf(buf, sizeof(buf),
 742             "\n"
 743             "Automatically generated file; DO NOT EDIT.\n"
 744             "%s\n",
 745             rootmenu.prompt->text);
 746
 747         printer->print_comment(fp, buf, printer_arg);
 748 }
 749
 750 /*
 751  * Write out a minimal config.
 752  * All values that has default values are skipped as this is redundant.
 753  */
 754 int conf_write_defconfig(const char *filename)
 755 {
 756         struct symbol *sym;
 757         struct menu *menu;
 758         FILE *out;
 759
 760         out = fopen(filename, "w");
 761         if (!out)
 762                 return 1;
 763
 764         sym_clear_all_valid();
 765
 766         /* Traverse all menus to find all relevant symbols */
 767         menu = rootmenu.list;
 768
 769         while (menu != NULL)
 770         {
 771                 sym = menu->sym;
 772                 if (sym == NULL) {
 773                         if (!menu_is_visible(menu))
 774                                 goto next_menu;
 775                 } else if (!sym_is_choice(sym)) {
 776                         sym_calc_value(sym);
 777                         if (!(sym->flags & SYMBOL_WRITE))
 778                                 goto next_menu;
 779                         sym->flags &= ~SYMBOL_WRITE;
 780                         /* If we cannot change the symbol - skip */
 781                         if (!sym_is_changeable(sym))
 782                                 goto next_menu;
 783                         /* If symbol equals to default value - skip */
 784                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 785                                 goto next_menu;
 786
 787                         /*
 788                          * If symbol is a choice value and equals to the
 789                          * default for a choice - skip.
 790                          * But only if value is bool and equal to "y" and
 791                          * choice is not "optional".
 792                          * (If choice is "optional" then all values can be "n")
 793                          */
 794                         if (sym_is_choice_value(sym)) {
 795                                 struct symbol *cs;
 796                                 struct symbol *ds;
 797
 798                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 799                                 ds = sym_choice_default(cs);
 800                                 if (!sym_is_optional(cs) && sym == ds) {
 801                                         if ((sym->type == S_BOOLEAN) &&
 802                                             sym_get_tristate_value(sym) == yes)
 803                                                 goto next_menu;
 804                                 }
 805                         }
 806                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 807                 }
 808 next_menu:
 809                 if (menu->list != NULL) {
 810                         menu = menu->list;
 811                 }
 812                 else if (menu->next != NULL) {
 813                         menu = menu->next;
 814                 } else {
 815                         while ((menu = menu->parent)) {
 816                                 if (menu->next != NULL) {
 817                                         menu = menu->next;
 818                                         break;
 819                                 }
 820                         }
 821                 }
 822         }
 823         fclose(out);
 824         return 0;
 825 }
 826
 827 int conf_write(const char *name)
 828 {
 829         FILE *out;
 830         struct symbol *sym;
 831         struct menu *menu;
 832         const char *str;
 833         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 834         char *env;
 835         int i;
 836         bool need_newline = false;
 837
 838         if (!name)
 839                 name = conf_get_configname();
 840
 841         if (!*name) {
 842                 fprintf(stderr, "config name is empty\n");
 843                 return -1;
 844         }
 845
 846         if (is_dir(name)) {
 847                 fprintf(stderr, "%s: Is a directory\n", name);
 848                 return -1;
 849         }
 850
 851         if (make_parent_dir(name))
 852                 return -1;
 853
 854         env = getenv("KCONFIG_OVERWRITECONFIG");
 855         if (env && *env) {
 856                 *tmpname = 0;
 857                 out = fopen(name, "w");
 858         } else {
 859                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 860                          name, (int)getpid());
 861                 out = fopen(tmpname, "w");
 862         }
 863         if (!out)
 864                 return 1;
 865
 866         conf_write_heading(out, &kconfig_printer_cb, NULL);
 867
 868         if (!conf_get_changed())
 869                 sym_clear_all_valid();
 870
 871         menu = rootmenu.list;
 872         while (menu) {
 873                 sym = menu->sym;
 874                 if (!sym) {
 875                         if (!menu_is_visible(menu))
 876                                 goto next;
 877                         str = menu_get_prompt(menu);
 878                         fprintf(out, "\n"
 879                                      "#\n"
 880                                      "# %s\n"
 881                                      "#\n", str);
 882                         need_newline = false;
 883                 } else if (!(sym->flags & SYMBOL_CHOICE) &&
 884                            !(sym->flags & SYMBOL_WRITTEN)) {
 885                         sym_calc_value(sym);
 886                         if (!(sym->flags & SYMBOL_WRITE))
 887                                 goto next;
 888                         if (need_newline) {
 889                                 fprintf(out, "\n");
 890                                 need_newline = false;
 891                         }
 892                         sym->flags |= SYMBOL_WRITTEN;
 893                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 894                 }
 895
 896 next:
 897                 if (menu->list) {
 898                         menu = menu->list;
 899                         continue;
 900                 }
 901                 if (menu->next)
 902                         menu = menu->next;
 903                 else while ((menu = menu->parent)) {
 904                         if (!menu->sym && menu_is_visible(menu) &&
 905                             menu != &rootmenu) {
 906                                 str = menu_get_prompt(menu);
 907                                 fprintf(out, "# end of %s\n", str);
 908                                 need_newline = true;
 909                         }
 910                         if (menu->next) {
 911                                 menu = menu->next;
 912                                 break;
 913                         }
 914                 }
 915         }
 916         fclose(out);
 917
 918         for_all_symbols(i, sym)
 919                 sym->flags &= ~SYMBOL_WRITTEN;
 920
 921         if (*tmpname) {
 922                 if (is_same(name, tmpname)) {
 923                         conf_message("No change to %s", name);
 924                         unlink(tmpname);
 925                         sym_set_change_count(0);
 926                         return 0;
 927                 }
 928
 929                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 930                 rename(name, oldname);
 931                 if (rename(tmpname, name))
 932                         return 1;
 933         }
 934
 935         conf_message("configuration written to %s", name);
 936
 937         sym_set_change_count(0);
 938
 939         return 0;
 940 }
 941
 942 /* write a dependency file as used by kbuild to track dependencies */
 943 static int conf_write_dep(const char *name)
 944 {
 945         struct file *file;
 946         FILE *out;
 947
 948         out = fopen("..config.tmp", "w");
 949         if (!out)
 950                 return 1;
 951         fprintf(out, "deps_config := \\\n");
 952         for (file = file_list; file; file = file->next) {
 953                 if (file->next)
 954                         fprintf(out, "\t%s \\\n", file->name);
 955                 else
 956                         fprintf(out, "\t%s\n", file->name);
 957         }
 958         fprintf(out, "\n%s: \\\n"
 959                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
 960
 961         env_write_dep(out, conf_get_autoconfig_name());
 962
 963         fprintf(out, "\n$(deps_config): ;\n");
 964         fclose(out);
 965
 966         if (make_parent_dir(name))
 967                 return 1;
 968         rename("..config.tmp", name);
 969         return 0;
 970 }
 971
 972 static int conf_touch_deps(void)
 973 {
 974         const char *name;
 975         struct symbol *sym;
 976         int res, i;
 977
 978         strcpy(depfile_path, "include/config/");
 979         depfile_prefix_len = strlen(depfile_path);
 980
 981         name = conf_get_autoconfig_name();
 982         conf_read_simple(name, S_DEF_AUTO);
 983         sym_calc_value(modules_sym);
 984
 985         for_all_symbols(i, sym) {
 986                 sym_calc_value(sym);
 987                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
 988                         continue;
 989                 if (sym->flags & SYMBOL_WRITE) {
 990                         if (sym->flags & SYMBOL_DEF_AUTO) {
 991                                 /*
 992                                  * symbol has old and new value,
 993                                  * so compare them...
 994                                  */
 995                                 switch (sym->type) {
 996                                 case S_BOOLEAN:
 997                                 case S_TRISTATE:
 998                                         if (sym_get_tristate_value(sym) ==
 999                                             sym->def[S_DEF_AUTO].tri)
1000                                                 continue;
1001                                         break;
1002                                 case S_STRING:
1003                                 case S_HEX:
1004                                 case S_INT:
1005                                         if (!strcmp(sym_get_string_value(sym),
1006                                                     sym->def[S_DEF_AUTO].val))
1007                                                 continue;
1008                                         break;
1009                                 default:
1010                                         break;
1011                                 }
1012                         } else {
1013                                 /*
1014                                  * If there is no old value, only 'no' (unset)
1015                                  * is allowed as new value.
1016                                  */
1017                                 switch (sym->type) {
1018                                 case S_BOOLEAN:
1019                                 case S_TRISTATE:
1020                                         if (sym_get_tristate_value(sym) == no)
1021                                                 continue;
1022                                         break;
1023                                 default:
1024                                         break;
1025                                 }
1026                         }
1027                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1028                         /* There is neither an old nor a new value. */
1029                         continue;
1030                 /* else
1031                  *      There is an old value, but no new value ('no' (unset)
1032                  *      isn't saved in auto.conf, so the old value is always
1033                  *      different from 'no').
1034                  */
1035
1036                 res = conf_touch_dep(sym->name);
1037                 if (res)
1038                         return res;
1039         }
1040
1041         return 0;
1042 }
1043
1044 int conf_write_autoconf(int overwrite)
1045 {
1046         struct symbol *sym;
1047         const char *name;
1048         const char *autoconf_name = conf_get_autoconfig_name();
1049         FILE *out, *out_h;
1050         int i;
1051
1052 #ifndef OPENWRT_DOES_NOT_WANT_THIS
1053         return 0;
1054 #endif
1055         if (!overwrite && is_present(autoconf_name))
1056                 return 0;
1057
1058         conf_write_dep("include/config/auto.conf.cmd");
1059
1060         if (conf_touch_deps())
1061                 return 1;
1062
1063         out = fopen(".tmpconfig", "w");
1064         if (!out)
1065                 return 1;
1066
1067         out_h = fopen(".tmpconfig.h", "w");
1068         if (!out_h) {
1069                 fclose(out);
1070                 return 1;
1071         }
1072
1073         conf_write_heading(out, &kconfig_printer_cb, NULL);
1074         conf_write_heading(out_h, &header_printer_cb, NULL);
1075
1076         for_all_symbols(i, sym) {
1077                 sym_calc_value(sym);
1078                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1079                         continue;
1080
1081                 /* write symbols to auto.conf and autoconf.h */
1082                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1083                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1084         }
1085         fclose(out);
1086         fclose(out_h);
1087
1088         name = getenv("KCONFIG_AUTOHEADER");
1089         if (!name)
1090                 name = "include/generated/autoconf.h";
1091         if (make_parent_dir(name))
1092                 return 1;
1093         if (rename(".tmpconfig.h", name))
1094                 return 1;
1095
1096         if (make_parent_dir(autoconf_name))
1097                 return 1;
1098         /*
1099          * This must be the last step, kbuild has a dependency on auto.conf
1100          * and this marks the successful completion of the previous steps.
1101          */
1102         if (rename(".tmpconfig", autoconf_name))
1103                 return 1;
1104
1105         return 0;
1106 }
1107
1108 static int sym_change_count;
1109 static void (*conf_changed_callback)(void);
1110
1111 void sym_set_change_count(int count)
1112 {
1113         int _sym_change_count = sym_change_count;
1114         sym_change_count = count;
1115         if (conf_changed_callback &&
1116             (bool)_sym_change_count != (bool)count)
1117                 conf_changed_callback();
1118 }
1119
1120 void sym_add_change_count(int count)
1121 {
1122         sym_set_change_count(count + sym_change_count);
1123 }
1124
1125 bool conf_get_changed(void)
1126 {
1127         return sym_change_count;
1128 }
1129
1130 void conf_set_changed_callback(void (*fn)(void))
1131 {
1132         conf_changed_callback = fn;
1133 }
1134
1135 static bool randomize_choice_values(struct symbol *csym)
1136 {
1137         struct property *prop;
1138         struct symbol *sym;
1139         struct expr *e;
1140         int cnt, def;
1141
1142         /*
1143          * If choice is mod then we may have more items selected
1144          * and if no then no-one.
1145          * In both cases stop.
1146          */
1147         if (csym->curr.tri != yes)
1148                 return false;
1149
1150         prop = sym_get_choice_prop(csym);
1151
1152         /* count entries in choice block */
1153         cnt = 0;
1154         expr_list_for_each_sym(prop->expr, e, sym)
1155                 cnt++;
1156
1157         /*
1158          * find a random value and set it to yes,
1159          * set the rest to no so we have only one set
1160          */
1161         def = (rand() % cnt);
1162
1163         cnt = 0;
1164         expr_list_for_each_sym(prop->expr, e, sym) {
1165                 if (def == cnt++) {
1166                         sym->def[S_DEF_USER].tri = yes;
1167                         csym->def[S_DEF_USER].val = sym;
1168                 }
1169                 else {
1170                         sym->def[S_DEF_USER].tri = no;
1171                 }
1172                 sym->flags |= SYMBOL_DEF_USER;
1173                 /* clear VALID to get value calculated */
1174                 sym->flags &= ~SYMBOL_VALID;
1175         }
1176         csym->flags |= SYMBOL_DEF_USER;
1177         /* clear VALID to get value calculated */
1178         csym->flags &= ~(SYMBOL_VALID);
1179
1180         return true;
1181 }
1182
1183 void set_all_choice_values(struct symbol *csym)
1184 {
1185         struct property *prop;
1186         struct symbol *sym;
1187         struct expr *e;
1188
1189         prop = sym_get_choice_prop(csym);
1190
1191         /*
1192          * Set all non-assinged choice values to no
1193          */
1194         expr_list_for_each_sym(prop->expr, e, sym) {
1195                 if (!sym_has_value(sym))
1196                         sym->def[S_DEF_USER].tri = no;
1197         }
1198         csym->flags |= SYMBOL_DEF_USER;
1199         /* clear VALID to get value calculated */
1200         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1201 }
1202
1203 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1204 {
1205         struct symbol *sym, *csym;
1206         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1207                                          * pty: probability of tristate = y
1208                                          * ptm: probability of tristate = m
1209                                          */
1210
1211         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1212                                    * below, otherwise gcc whines about
1213                                    * -Wmaybe-uninitialized */
1214         if (mode == def_random) {
1215                 int n, p[3];
1216                 char *env = getenv("KCONFIG_PROBABILITY");
1217                 n = 0;
1218                 while( env && *env ) {
1219                         char *endp;
1220                         int tmp = strtol( env, &endp, 10 );
1221                         if( tmp >= 0 && tmp <= 100 ) {
1222                                 p[n++] = tmp;
1223                         } else {
1224                                 errno = ERANGE;
1225                                 perror( "KCONFIG_PROBABILITY" );
1226                                 exit( 1 );
1227                         }
1228                         env = (*endp == ':') ? endp+1 : endp;
1229                         if( n >=3 ) {
1230                                 break;
1231                         }
1232                 }
1233                 switch( n ) {
1234                 case 1:
1235                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1236                         break;
1237                 case 2:
1238                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1239                         break;
1240                 case 3:
1241                         pby = p[0]; pty = p[1]; ptm = p[2];
1242                         break;
1243                 }
1244
1245                 if( pty+ptm > 100 ) {
1246                         errno = ERANGE;
1247                         perror( "KCONFIG_PROBABILITY" );
1248                         exit( 1 );
1249                 }
1250         }
1251         bool has_changed = false;
1252
1253         sym_clear_all_valid();
1254
1255         for_all_symbols(i, sym) {
1256                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1257                         continue;
1258                 switch (sym_get_type(sym)) {
1259                 case S_BOOLEAN:
1260                 case S_TRISTATE:
1261                         has_changed = true;
1262                         switch (mode) {
1263                         case def_yes:
1264                                 sym->def[S_DEF_USER].tri = yes;
1265                                 break;
1266                         case def_mod:
1267                                 sym->def[S_DEF_USER].tri = mod;
1268                                 break;
1269                         case def_no:
1270                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1271                                         sym->def[S_DEF_USER].tri = yes;
1272                                 else
1273                                         sym->def[S_DEF_USER].tri = no;
1274                                 break;
1275                         case def_random:
1276                                 sym->def[S_DEF_USER].tri = no;
1277                                 cnt = rand() % 100;
1278                                 if (sym->type == S_TRISTATE) {
1279                                         if (cnt < pty)
1280                                                 sym->def[S_DEF_USER].tri = yes;
1281                                         else if (cnt < (pty+ptm))
1282                                                 sym->def[S_DEF_USER].tri = mod;
1283                                 } else if (cnt < pby)
1284                                         sym->def[S_DEF_USER].tri = yes;
1285                                 break;
1286                         default:
1287                                 continue;
1288                         }
1289                         if (!(sym_is_choice(sym) && mode == def_random))
1290                                 sym->flags |= SYMBOL_DEF_USER;
1291                         break;
1292                 default:
1293                         break;
1294                 }
1295
1296         }
1297
1298         /*
1299          * We have different type of choice blocks.
1300          * If curr.tri equals to mod then we can select several
1301          * choice symbols in one block.
1302          * In this case we do nothing.
1303          * If curr.tri equals yes then only one symbol can be
1304          * selected in a choice block and we set it to yes,
1305          * and the rest to no.
1306          */
1307         if (mode != def_random) {
1308                 for_all_symbols(i, csym) {
1309                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1310                             sym_is_choice_value(csym))
1311                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1312                 }
1313         }
1314
1315         for_all_symbols(i, csym) {
1316                 if (sym_has_value(csym) || !sym_is_choice(csym))
1317                         continue;
1318
1319                 sym_calc_value(csym);
1320                 if (mode == def_random)
1321                         has_changed = randomize_choice_values(csym);
1322                 else {
1323                         set_all_choice_values(csym);
1324                         has_changed = true;
1325                 }
1326         }
1327
1328         return has_changed;
1329 }
1330
1331 void conf_rewrite_mod_or_yes(enum conf_def_mode mode)
1332 {
1333         struct symbol *sym;
1334         int i;
1335         tristate old_val = (mode == def_y2m) ? yes : mod;
1336         tristate new_val = (mode == def_y2m) ? mod : yes;
1337
1338         for_all_symbols(i, sym) {
1339                 if (sym_get_type(sym) == S_TRISTATE &&
1340                     sym->def[S_DEF_USER].tri == old_val) {
1341                         sym->def[S_DEF_USER].tri = new_val;
1342                         sym_add_change_count(1);
1343                 }
1344         }
1345 }