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 const char conf_defname[] = "include/generated/defconfig";
 181
 182 static void conf_warning(const char *fmt, ...)
 183 {
 184         va_list ap;
 185         va_start(ap, fmt);
 186         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
 187         vfprintf(stderr, fmt, ap);
 188         fprintf(stderr, "\n");
 189         va_end(ap);
 190         conf_warnings++;
 191 }
 192
 193 static void conf_default_message_callback(const char *s)
 194 {
 195         printf("#\n# ");
 196         printf("%s", s);
 197         printf("\n#\n");
 198 }
 199
 200 static void (*conf_message_callback)(const char *s) =
 201         conf_default_message_callback;
 202 void conf_set_message_callback(void (*fn)(const char *s))
 203 {
 204         conf_message_callback = fn;
 205 }
 206
 207 static void conf_message(const char *fmt, ...)
 208 {
 209         va_list ap;
 210         char buf[4096];
 211
 212         if (!conf_message_callback)
 213                 return;
 214
 215         va_start(ap, fmt);
 216
 217         vsnprintf(buf, sizeof(buf), fmt, ap);
 218         conf_message_callback(buf);
 219         va_end(ap);
 220 }
 221
 222 const char *conf_get_configname(void)
 223 {
 224         char *name = getenv("KCONFIG_CONFIG");
 225
 226         return name ? name : ".config";
 227 }
 228
 229 const char *conf_get_autoconfig_name(void)
 230 {
 231         char *name = getenv("KCONFIG_AUTOCONFIG");
 232
 233         return name ? name : "include/generated/auto.conf";
 234 }
 235
 236 char *conf_get_default_confname(void)
 237 {
 238         static char fullname[PATH_MAX+1];
 239         char *env, *name;
 240
 241         name = expand_string(conf_defname);
 242         env = getenv(SRCTREE);
 243         if (env) {
 244                 sprintf(fullname, "%s/%s", env, name);
 245                 if (is_present(fullname))
 246                         return fullname;
 247         }
 248         return name;
 249 }
 250
 251 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 252 {
 253         char *p2;
 254
 255         switch (sym->type) {
 256         case S_TRISTATE:
 257                 if (p[0] == 'm') {
 258                         sym->def[def].tri = mod;
 259                         sym->flags |= def_flags;
 260                         break;
 261                 }
 262                 /* fall through */
 263         case S_BOOLEAN:
 264                 if (p[0] == 'y') {
 265                         sym->def[def].tri = yes;
 266                         sym->flags |= def_flags;
 267                         break;
 268                 }
 269                 if (p[0] == 'n') {
 270                         sym->def[def].tri = no;
 271                         sym->flags |= def_flags;
 272                         break;
 273                 }
 274                 if (def != S_DEF_AUTO)
 275                         conf_warning("symbol value '%s' invalid for %s",
 276                                      p, sym->name);
 277                 return 1;
 278         case S_STRING:
 279                 if (*p++ != '"')
 280                         break;
 281                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 282                         if (*p2 == '"') {
 283                                 *p2 = 0;
 284                                 break;
 285                         }
 286                         memmove(p2, p2 + 1, strlen(p2));
 287                 }
 288                 if (!p2) {
 289                         if (def != S_DEF_AUTO)
 290                                 conf_warning("invalid string found");
 291                         return 1;
 292                 }
 293                 /* fall through */
 294         case S_INT:
 295         case S_HEX:
 296                 if (sym_string_valid(sym, p)) {
 297                         sym->def[def].val = xstrdup(p);
 298                         sym->flags |= def_flags;
 299                 } else {
 300                         if (def != S_DEF_AUTO)
 301                                 conf_warning("symbol value '%s' invalid for %s",
 302                                              p, sym->name);
 303                         return 1;
 304                 }
 305                 break;
 306         default:
 307                 ;
 308         }
 309         return 0;
 310 }
 311
 312 #define LINE_GROWTH 16
 313 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 314 {
 315         char *nline;
 316         size_t new_size = slen + 1;
 317         if (new_size > *n) {
 318                 new_size += LINE_GROWTH - 1;
 319                 new_size *= 2;
 320                 nline = xrealloc(*lineptr, new_size);
 321                 if (!nline)
 322                         return -1;
 323
 324                 *lineptr = nline;
 325                 *n = new_size;
 326         }
 327
 328         (*lineptr)[slen] = c;
 329
 330         return 0;
 331 }
 332
 333 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 334 {
 335         char *line = *lineptr;
 336         size_t slen = 0;
 337
 338         for (;;) {
 339                 int c = getc(stream);
 340
 341                 switch (c) {
 342                 case '\n':
 343                         if (add_byte(c, &line, slen, n) < 0)
 344                                 goto e_out;
 345                         slen++;
 346                         /* fall through */
 347                 case EOF:
 348                         if (add_byte('\0', &line, slen, n) < 0)
 349                                 goto e_out;
 350                         *lineptr = line;
 351                         if (slen == 0)
 352                                 return -1;
 353                         return slen;
 354                 default:
 355                         if (add_byte(c, &line, slen, n) < 0)
 356                                 goto e_out;
 357                         slen++;
 358                 }
 359         }
 360
 361 e_out:
 362         line[slen-1] = '\0';
 363         *lineptr = line;
 364         return -1;
 365 }
 366
 367 int conf_read_simple(const char *name, int def)
 368 {
 369         FILE *in = NULL;
 370         char   *line = NULL;
 371         size_t  line_asize = 0;
 372         char *p, *p2;
 373         struct symbol *sym;
 374         int i, def_flags;
 375
 376         if (name) {
 377                 in = zconf_fopen(name);
 378         } else {
 379                 struct property *prop;
 380
 381                 name = conf_get_configname();
 382                 in = zconf_fopen(name);
 383                 if (in)
 384                         goto load;
 385                 sym_add_change_count(1);
 386                 if (!sym_defconfig_list)
 387                         return 1;
 388
 389                 for_all_defaults(sym_defconfig_list, prop) {
 390                         if (expr_calc_value(prop->visible.expr) == no ||
 391                             prop->expr->type != E_SYMBOL)
 392                                 continue;
 393                         sym_calc_value(prop->expr->left.sym);
 394                         name = sym_get_string_value(prop->expr->left.sym);
 395                         in = zconf_fopen(name);
 396                         if (in) {
 397                                 conf_message("using defaults found in %s",
 398                                          name);
 399                                 goto load;
 400                         }
 401                 }
 402         }
 403         if (!in)
 404                 return 1;
 405
 406 load:
 407         conf_filename = name;
 408         conf_lineno = 0;
 409         conf_warnings = 0;
 410
 411         def_flags = SYMBOL_DEF << def;
 412         for_all_symbols(i, sym) {
 413                 sym->flags |= SYMBOL_CHANGED;
 414                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 415                 if (sym_is_choice(sym))
 416                         sym->flags |= def_flags;
 417                 switch (sym->type) {
 418                 case S_INT:
 419                 case S_HEX:
 420                 case S_STRING:
 421                         if (sym->def[def].val)
 422                                 free(sym->def[def].val);
 423                         /* fall through */
 424                 default:
 425                         sym->def[def].val = NULL;
 426                         sym->def[def].tri = no;
 427                 }
 428         }
 429
 430         while (compat_getline(&line, &line_asize, in) != -1) {
 431                 conf_lineno++;
 432                 sym = NULL;
 433                 if (line[0] == '#') {
 434                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 435                                 continue;
 436                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 437                         if (!p)
 438                                 continue;
 439                         *p++ = 0;
 440                         if (strncmp(p, "is not set", 10))
 441                                 continue;
 442                         if (def == S_DEF_USER) {
 443                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 444                                 if (!sym) {
 445                                         sym_add_change_count(1);
 446                                         continue;
 447                                 }
 448                         } else {
 449                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 450                                 if (sym->type == S_UNKNOWN)
 451                                         sym->type = S_BOOLEAN;
 452                         }
 453                         if (sym->flags & def_flags) {
 454                                 conf_warning("override: reassigning to symbol %s", sym->name);
 455                         }
 456                         switch (sym->type) {
 457                         case S_BOOLEAN:
 458                         case S_TRISTATE:
 459                                 sym->def[def].tri = no;
 460                                 sym->flags |= def_flags;
 461                                 break;
 462                         default:
 463                                 ;
 464                         }
 465                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 466                         p = strchr(line + strlen(CONFIG_), '=');
 467                         if (!p)
 468                                 continue;
 469                         *p++ = 0;
 470                         p2 = strchr(p, '\n');
 471                         if (p2) {
 472                                 *p2-- = 0;
 473                                 if (*p2 == '\r')
 474                                         *p2 = 0;
 475                         }
 476
 477                         sym = sym_find(line + strlen(CONFIG_));
 478                         if (!sym) {
 479                                 if (def == S_DEF_AUTO)
 480                                         /*
 481                                          * Reading from include/config/auto.conf
 482                                          * If CONFIG_FOO previously existed in
 483                                          * auto.conf but it is missing now,
 484                                          * include/config/foo.h must be touched.
 485                                          */
 486                                         conf_touch_dep(line + strlen(CONFIG_));
 487                                 else
 488                                         sym_add_change_count(1);
 489                                 continue;
 490                         }
 491
 492                         if (sym->flags & def_flags) {
 493                                 conf_warning("override: reassigning to symbol %s", sym->name);
 494                         }
 495                         if (conf_set_sym_val(sym, def, def_flags, p))
 496                                 continue;
 497                 } else {
 498                         if (line[0] != '\r' && line[0] != '\n')
 499                                 conf_warning("unexpected data: %.*s",
 500                                              (int)strcspn(line, "\r\n"), line);
 501
 502                         continue;
 503                 }
 504
 505                 if (sym && sym_is_choice_value(sym)) {
 506                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 507                         switch (sym->def[def].tri) {
 508                         case no:
 509                                 break;
 510                         case mod:
 511                                 if (cs->def[def].tri == yes) {
 512                                         conf_warning("%s creates inconsistent choice state", sym->name);
 513                                         cs->flags &= ~def_flags;
 514                                 }
 515                                 break;
 516                         case yes:
 517                                 if (cs->def[def].tri != no)
 518                                         conf_warning("override: %s changes choice state", sym->name);
 519                                 cs->def[def].val = sym;
 520                                 break;
 521                         }
 522                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 523                 }
 524         }
 525         free(line);
 526         fclose(in);
 527         return 0;
 528 }
 529
 530 int conf_read(const char *name)
 531 {
 532         struct symbol *sym;
 533         int conf_unsaved = 0;
 534         int i;
 535
 536         sym_set_change_count(0);
 537
 538         if (conf_read_simple(name, S_DEF_USER)) {
 539                 sym_calc_value(modules_sym);
 540                 return 1;
 541         }
 542
 543         sym_calc_value(modules_sym);
 544
 545         for_all_symbols(i, sym) {
 546                 sym_calc_value(sym);
 547                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 548                         continue;
 549                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 550                         /* check that calculated value agrees with saved value */
 551                         switch (sym->type) {
 552                         case S_BOOLEAN:
 553                         case S_TRISTATE:
 554                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 555                                         break;
 556                                 if (!sym_is_choice(sym))
 557                                         continue;
 558                                 /* fall through */
 559                         default:
 560                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 561                                         continue;
 562                                 break;
 563                         }
 564                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 565                         /* no previous value and not saved */
 566                         continue;
 567                 conf_unsaved++;
 568                 /* maybe print value in verbose mode... */
 569         }
 570
 571         for_all_symbols(i, sym) {
 572                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 573                         /* Reset values of generates values, so they'll appear
 574                          * as new, if they should become visible, but that
 575                          * doesn't quite work if the Kconfig and the saved
 576                          * configuration disagree.
 577                          */
 578                         if (sym->visible == no && !conf_unsaved)
 579                                 sym->flags &= ~SYMBOL_DEF_USER;
 580                         switch (sym->type) {
 581                         case S_STRING:
 582                         case S_INT:
 583                         case S_HEX:
 584                                 /* Reset a string value if it's out of range */
 585                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 586                                         break;
 587                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 588                                 conf_unsaved++;
 589                                 break;
 590                         default:
 591                                 break;
 592                         }
 593                 }
 594         }
 595
 596         sym_add_change_count(conf_warnings || conf_unsaved);
 597
 598         return 0;
 599 }
 600
 601 /*
 602  * Kconfig configuration printer
 603  *
 604  * This printer is used when generating the resulting configuration after
 605  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 606  * passing a non-NULL argument to the printer.
 607  *
 608  */
 609 static void
 610 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 611 {
 612
 613         switch (sym->type) {
 614         case S_BOOLEAN:
 615         case S_TRISTATE:
 616                 if (*value == 'n') {
 617                         bool skip_unset = (arg != NULL);
 618
 619                         if (!skip_unset)
 620                                 fprintf(fp, "# %s%s is not set\n",
 621                                     CONFIG_, sym->name);
 622                         return;
 623                 }
 624                 break;
 625         default:
 626                 break;
 627         }
 628
 629         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 630 }
 631
 632 static void
 633 kconfig_print_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 634 {
 635
 636         switch (sym->type) {
 637         case S_BOOLEAN:
 638         case S_TRISTATE:
 639                 if (*value == 'n') {
 640                         bool skip_unset = (arg != NULL);
 641
 642                         if (!skip_unset)
 643                                 fprintf(fp, "set(%s%s false)\n",
 644                                         CONFIG_, sym->name, value);
 645                         return;
 646                 } else if (*value == 'm') {
 647                         abort();
 648                 } else {
 649                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 650                 }
 651                 break;
 652         case S_HEX: {
 653                 const char *prefix = "";
 654
 655                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 656                         prefix = "0x";
 657                 fprintf(fp, "set(%s%s %s%s)\n",
 658                     CONFIG_, sym->name, prefix, value);
 659                 break;
 660         }
 661         case S_STRING:
 662         case S_INT:
 663                 fprintf(fp, "set(%s%s %s)\n",
 664                     CONFIG_, sym->name, value);
 665                 break;
 666         default:
 667                 break;
 668         }
 669
 670 }
 671
 672 static void
 673 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 674 {
 675         const char *p = value;
 676         size_t l;
 677
 678         for (;;) {
 679                 l = strcspn(p, "\n");
 680                 fprintf(fp, "#");
 681                 if (l) {
 682                         fprintf(fp, " ");
 683                         xfwrite(p, l, 1, fp);
 684                         p += l;
 685                 }
 686                 fprintf(fp, "\n");
 687                 if (*p++ == '\0')
 688                         break;
 689         }
 690 }
 691
 692 static struct conf_printer kconfig_printer_cb =
 693 {
 694         .print_symbol = kconfig_print_symbol,
 695         .print_comment = kconfig_print_comment,
 696 };
 697
 698 static struct conf_printer kconfig_printer_cmake_cb =
 699 {
 700         .print_symbol = kconfig_print_cmake_symbol,
 701         .print_comment = kconfig_print_comment,
 702 };
 703
 704 /*
 705  * Header printer
 706  *
 707  * This printer is used when generating the `include/generated/autoconf.h' file.
 708  */
 709 static void
 710 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 711 {
 712
 713         switch (sym->type) {
 714         case S_BOOLEAN:
 715         case S_TRISTATE: {
 716                 const char *suffix = "";
 717
 718                 switch (*value) {
 719                 case 'n':
 720                         break;
 721                 case 'm':
 722                         suffix = "_MODULE";
 723                         /* fall through */
 724                 default:
 725                         fprintf(fp, "#define %s%s%s 1\n",
 726                             CONFIG_, sym->name, suffix);
 727                 }
 728                 break;
 729         }
 730         case S_HEX: {
 731                 const char *prefix = "";
 732
 733                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 734                         prefix = "0x";
 735                 fprintf(fp, "#define %s%s %s%s\n",
 736                     CONFIG_, sym->name, prefix, value);
 737                 break;
 738         }
 739         case S_STRING:
 740         case S_INT:
 741                 fprintf(fp, "#define %s%s %s\n",
 742                     CONFIG_, sym->name, value);
 743                 break;
 744         default:
 745                 break;
 746         }
 747
 748 }
 749
 750 static void
 751 header_print_comment(FILE *fp, const char *value, void *arg)
 752 {
 753         const char *p = value;
 754         size_t l;
 755
 756         fprintf(fp, "/*\n");
 757         for (;;) {
 758                 l = strcspn(p, "\n");
 759                 fprintf(fp, " *");
 760                 if (l) {
 761                         fprintf(fp, " ");
 762                         xfwrite(p, l, 1, fp);
 763                         p += l;
 764                 }
 765                 fprintf(fp, "\n");
 766                 if (*p++ == '\0')
 767                         break;
 768         }
 769         fprintf(fp, " */\n");
 770 }
 771
 772 static struct conf_printer header_printer_cb =
 773 {
 774         .print_symbol = header_print_symbol,
 775         .print_comment = header_print_comment,
 776 };
 777
 778 /*
 779  * Tristate printer
 780  *
 781  * This printer is used when generating the `include/generated/tristate.conf' file.
 782  */
 783 static void
 784 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 785 {
 786
 787         if (sym->type == S_TRISTATE && *value != 'n')
 788                 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
 789 }
 790
 791 static struct conf_printer tristate_printer_cb =
 792 {
 793         .print_symbol = tristate_print_symbol,
 794         .print_comment = kconfig_print_comment,
 795 };
 796
 797 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 798                               struct conf_printer *printer, void *printer_arg)
 799 {
 800         const char *str;
 801
 802         switch (sym->type) {
 803         case S_UNKNOWN:
 804                 break;
 805         case S_STRING:
 806                 str = sym_get_string_value(sym);
 807                 str = sym_escape_string_value(str);
 808                 printer->print_symbol(fp, sym, str, printer_arg);
 809                 free((void *)str);
 810                 break;
 811         default:
 812                 str = sym_get_string_value(sym);
 813                 printer->print_symbol(fp, sym, str, printer_arg);
 814         }
 815 }
 816
 817 static void
 818 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 819 {
 820         char buf[256];
 821
 822         snprintf(buf, sizeof(buf),
 823             "\n"
 824             "Automatically generated file; DO NOT EDIT.\n"
 825             "%s\n",
 826             rootmenu.prompt->text);
 827
 828         printer->print_comment(fp, buf, printer_arg);
 829 }
 830
 831 /*
 832  * Write out a minimal config.
 833  * All values that has default values are skipped as this is redundant.
 834  */
 835 int conf_write_defconfig(const char *filename)
 836 {
 837         struct symbol *sym;
 838         struct menu *menu;
 839         FILE *out;
 840
 841         out = fopen(filename, "w");
 842         if (!out)
 843                 return 1;
 844
 845         sym_clear_all_valid();
 846
 847         /* Traverse all menus to find all relevant symbols */
 848         menu = rootmenu.list;
 849
 850         while (menu != NULL)
 851         {
 852                 sym = menu->sym;
 853                 if (sym == NULL) {
 854                         if (!menu_is_visible(menu))
 855                                 goto next_menu;
 856                 } else if (!sym_is_choice(sym)) {
 857                         sym_calc_value(sym);
 858                         if (!(sym->flags & SYMBOL_WRITE))
 859                                 goto next_menu;
 860                         sym->flags &= ~SYMBOL_WRITE;
 861                         /* If we cannot change the symbol - skip */
 862                         if (!sym_is_changable(sym))
 863                                 goto next_menu;
 864                         /* If symbol equals to default value - skip */
 865                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 866                                 goto next_menu;
 867
 868                         /*
 869                          * If symbol is a choice value and equals to the
 870                          * default for a choice - skip.
 871                          * But only if value is bool and equal to "y" and
 872                          * choice is not "optional".
 873                          * (If choice is "optional" then all values can be "n")
 874                          */
 875                         if (sym_is_choice_value(sym)) {
 876                                 struct symbol *cs;
 877                                 struct symbol *ds;
 878
 879                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 880                                 ds = sym_choice_default(cs);
 881                                 if (!sym_is_optional(cs) && sym == ds) {
 882                                         if ((sym->type == S_BOOLEAN) &&
 883                                             sym_get_tristate_value(sym) == yes)
 884                                                 goto next_menu;
 885                                 }
 886                         }
 887                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 888                 }
 889 next_menu:
 890                 if (menu->list != NULL) {
 891                         menu = menu->list;
 892                 }
 893                 else if (menu->next != NULL) {
 894                         menu = menu->next;
 895                 } else {
 896                         while ((menu = menu->parent)) {
 897                                 if (menu->next != NULL) {
 898                                         menu = menu->next;
 899                                         break;
 900                                 }
 901                         }
 902                 }
 903         }
 904         fclose(out);
 905         return 0;
 906 }
 907
 908 int conf_write(const char *name)
 909 {
 910         FILE *out;
 911         struct symbol *sym;
 912         struct menu *menu;
 913         const char *str;
 914         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 915         char *env;
 916
 917         if (!name)
 918                 name = conf_get_configname();
 919
 920         if (!*name) {
 921                 fprintf(stderr, "config name is empty\n");
 922                 return -1;
 923         }
 924
 925         if (is_dir(name)) {
 926                 fprintf(stderr, "%s: Is a directory\n", name);
 927                 return -1;
 928         }
 929
 930         env = getenv("KCONFIG_OVERWRITECONFIG");
 931         if (env && *env) {
 932                 *tmpname = 0;
 933                 out = fopen(name, "w");
 934         } else {
 935                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 936                          name, (int)getpid());
 937                 out = fopen(tmpname, "w");
 938         }
 939         if (!out)
 940                 return 1;
 941
 942         conf_write_heading(out, &kconfig_printer_cb, NULL);
 943
 944         if (!conf_get_changed())
 945                 sym_clear_all_valid();
 946
 947         menu = rootmenu.list;
 948         while (menu) {
 949                 sym = menu->sym;
 950                 if (!sym) {
 951                         if (!menu_is_visible(menu))
 952                                 goto next;
 953                         str = menu_get_prompt(menu);
 954                         fprintf(out, "\n"
 955                                      "#\n"
 956                                      "# %s\n"
 957                                      "#\n", str);
 958                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 959                         sym_calc_value(sym);
 960                         if (!(sym->flags & SYMBOL_WRITE))
 961                                 goto next;
 962                         sym->flags &= ~SYMBOL_WRITE;
 963
 964                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 965                 }
 966
 967 next:
 968                 if (menu->list) {
 969                         menu = menu->list;
 970                         continue;
 971                 }
 972                 if (menu->next)
 973                         menu = menu->next;
 974                 else while ((menu = menu->parent)) {
 975                         if (menu->next) {
 976                                 menu = menu->next;
 977                                 break;
 978                         }
 979                 }
 980         }
 981         fclose(out);
 982
 983         if (*tmpname) {
 984                 if (is_same(name, tmpname)) {
 985                         conf_message("No change to %s", name);
 986                         unlink(tmpname);
 987                         sym_set_change_count(0);
 988                         return 0;
 989                 }
 990
 991                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 992                 rename(name, oldname);
 993                 if (rename(tmpname, name))
 994                         return 1;
 995         }
 996
 997         conf_message("configuration written to %s", name);
 998
 999         sym_set_change_count(0);
1000
1001         return 0;
1002 }
1003
1004 /* write a dependency file as used by kbuild to track dependencies */
1005 static int conf_write_dep(const char *name)
1006 {
1007         struct file *file;
1008         FILE *out;
1009
1010         if (!name)
1011                 name = ".kconfig.d";
1012         out = fopen("..config.tmp", "w");
1013         if (!out)
1014                 return 1;
1015         fprintf(out, "deps_config := \\\n");
1016         for (file = file_list; file; file = file->next) {
1017                 if (file->next)
1018                         fprintf(out, "\t%s \\\n", file->name);
1019                 else
1020                         fprintf(out, "\t%s\n", file->name);
1021         }
1022         fprintf(out, "\n%s: \\\n"
1023                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
1024
1025         env_write_dep(out, conf_get_autoconfig_name());
1026
1027         fprintf(out, "\n$(deps_config): ;\n");
1028         fclose(out);
1029
1030         if (make_parent_dir(name))
1031                 return 1;
1032         rename("..config.tmp", name);
1033         return 0;
1034 }
1035
1036 static int conf_touch_deps(void)
1037 {
1038         const char *name;
1039         struct symbol *sym;
1040         int res, i;
1041
1042         strcpy(depfile_path, "include/generated/");
1043         depfile_prefix_len = strlen(depfile_path);
1044
1045         name = conf_get_autoconfig_name();
1046         conf_read_simple(name, S_DEF_AUTO);
1047         sym_calc_value(modules_sym);
1048
1049         for_all_symbols(i, sym) {
1050                 sym_calc_value(sym);
1051                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1052                         continue;
1053                 if (sym->flags & SYMBOL_WRITE) {
1054                         if (sym->flags & SYMBOL_DEF_AUTO) {
1055                                 /*
1056                                  * symbol has old and new value,
1057                                  * so compare them...
1058                                  */
1059                                 switch (sym->type) {
1060                                 case S_BOOLEAN:
1061                                 case S_TRISTATE:
1062                                         if (sym_get_tristate_value(sym) ==
1063                                             sym->def[S_DEF_AUTO].tri)
1064                                                 continue;
1065                                         break;
1066                                 case S_STRING:
1067                                 case S_HEX:
1068                                 case S_INT:
1069                                         if (!strcmp(sym_get_string_value(sym),
1070                                                     sym->def[S_DEF_AUTO].val))
1071                                                 continue;
1072                                         break;
1073                                 default:
1074                                         break;
1075                                 }
1076                         } else {
1077                                 /*
1078                                  * If there is no old value, only 'no' (unset)
1079                                  * is allowed as new value.
1080                                  */
1081                                 switch (sym->type) {
1082                                 case S_BOOLEAN:
1083                                 case S_TRISTATE:
1084                                         if (sym_get_tristate_value(sym) == no)
1085                                                 continue;
1086                                         break;
1087                                 default:
1088                                         break;
1089                                 }
1090                         }
1091                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1092                         /* There is neither an old nor a new value. */
1093                         continue;
1094                 /* else
1095                  *      There is an old value, but no new value ('no' (unset)
1096                  *      isn't saved in auto.conf, so the old value is always
1097                  *      different from 'no').
1098                  */
1099
1100                 res = conf_touch_dep(sym->name);
1101                 if (res)
1102                         return res;
1103         }
1104
1105         return 0;
1106 }
1107
1108 int conf_write_autoconf(int overwrite)
1109 {
1110         struct symbol *sym;
1111         const char *name;
1112         const char *autoconf_name = conf_get_autoconfig_name();
1113         FILE *out, *tristate, *out_h, *out_c;
1114         int i;
1115
1116         if (!overwrite && is_present(autoconf_name))
1117                 return 0;
1118
1119         sym_clear_all_valid();
1120
1121         conf_write_dep("include/generated/auto.conf.cmd");
1122
1123         if (conf_touch_deps())
1124                 return 1;
1125
1126         out = fopen(".tmpconfig", "w");
1127         if (!out)
1128                 return 1;
1129
1130         tristate = fopen(".tmpconfig_tristate", "w");
1131         if (!tristate) {
1132                 fclose(out);
1133                 return 1;
1134         }
1135
1136         out_h = fopen(".tmpconfig.h", "w");
1137         if (!out_h) {
1138                 fclose(out);
1139                 fclose(tristate);
1140                 return 1;
1141         }
1142
1143         out_c = fopen(".tmpconfig.cmake", "w");
1144         if (!out_c) {
1145                 fclose(out);
1146                 fclose(tristate);
1147                 fclose(out_h);
1148         }
1149
1150         conf_write_heading(out, &kconfig_printer_cb, NULL);
1151
1152         conf_write_heading(tristate, &tristate_printer_cb, NULL);
1153
1154         conf_write_heading(out_h, &header_printer_cb, NULL);
1155
1156         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1157
1158         for_all_symbols(i, sym) {
1159                 sym_calc_value(sym);
1160                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1161                         continue;
1162
1163                 /* write symbol to auto.conf, tristate and header files */
1164                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1165
1166                 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1167
1168                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1169
1170                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1171         }
1172         fclose(out);
1173         fclose(tristate);
1174         fclose(out_h);
1175         fclose(out_c);
1176
1177         name = getenv("KCONFIG_AUTOHEADER");
1178         if (!name)
1179                 name = "include/generated/autoconf.h";
1180         if (make_parent_dir(name))
1181                 return 1;
1182         if (rename(".tmpconfig.h", name))
1183                 return 1;
1184
1185         name = getenv("KCONFIG_TRISTATE");
1186         if (!name)
1187                 name = "include/generated/tristate.conf";
1188         if (make_parent_dir(name))
1189                 return 1;
1190         if (rename(".tmpconfig_tristate", name))
1191                 return 1;
1192
1193         if (make_parent_dir(autoconf_name))
1194                 return 1;
1195
1196         name = getenv("KCONFIG_CMAKE");
1197         if (!name)
1198                 name = "config.cmake";
1199         if (make_parent_dir(name))
1200                 return 1;
1201         if (rename(".tmpconfig.cmake", name))
1202                 return 1;
1203
1204         /*
1205          * This must be the last step, kbuild has a dependency on auto.conf
1206          * and this marks the successful completion of the previous steps.
1207          */
1208         if (rename(".tmpconfig", autoconf_name))
1209                 return 1;
1210
1211         return 0;
1212 }
1213
1214 static int sym_change_count;
1215 static void (*conf_changed_callback)(void);
1216
1217 void sym_set_change_count(int count)
1218 {
1219         int _sym_change_count = sym_change_count;
1220         sym_change_count = count;
1221         if (conf_changed_callback &&
1222             (bool)_sym_change_count != (bool)count)
1223                 conf_changed_callback();
1224 }
1225
1226 void sym_add_change_count(int count)
1227 {
1228         sym_set_change_count(count + sym_change_count);
1229 }
1230
1231 bool conf_get_changed(void)
1232 {
1233         return sym_change_count;
1234 }
1235
1236 void conf_set_changed_callback(void (*fn)(void))
1237 {
1238         conf_changed_callback = fn;
1239 }
1240
1241 static bool randomize_choice_values(struct symbol *csym)
1242 {
1243         struct property *prop;
1244         struct symbol *sym;
1245         struct expr *e;
1246         int cnt, def;
1247
1248         /*
1249          * If choice is mod then we may have more items selected
1250          * and if no then no-one.
1251          * In both cases stop.
1252          */
1253         if (csym->curr.tri != yes)
1254                 return false;
1255
1256         prop = sym_get_choice_prop(csym);
1257
1258         /* count entries in choice block */
1259         cnt = 0;
1260         expr_list_for_each_sym(prop->expr, e, sym)
1261                 cnt++;
1262
1263         /*
1264          * find a random value and set it to yes,
1265          * set the rest to no so we have only one set
1266          */
1267         def = (rand() % cnt);
1268
1269         cnt = 0;
1270         expr_list_for_each_sym(prop->expr, e, sym) {
1271                 if (def == cnt++) {
1272                         sym->def[S_DEF_USER].tri = yes;
1273                         csym->def[S_DEF_USER].val = sym;
1274                 }
1275                 else {
1276                         sym->def[S_DEF_USER].tri = no;
1277                 }
1278                 sym->flags |= SYMBOL_DEF_USER;
1279                 /* clear VALID to get value calculated */
1280                 sym->flags &= ~SYMBOL_VALID;
1281         }
1282         csym->flags |= SYMBOL_DEF_USER;
1283         /* clear VALID to get value calculated */
1284         csym->flags &= ~(SYMBOL_VALID);
1285
1286         return true;
1287 }
1288
1289 void set_all_choice_values(struct symbol *csym)
1290 {
1291         struct property *prop;
1292         struct symbol *sym;
1293         struct expr *e;
1294
1295         prop = sym_get_choice_prop(csym);
1296
1297         /*
1298          * Set all non-assinged choice values to no
1299          */
1300         expr_list_for_each_sym(prop->expr, e, sym) {
1301                 if (!sym_has_value(sym))
1302                         sym->def[S_DEF_USER].tri = no;
1303         }
1304         csym->flags |= SYMBOL_DEF_USER;
1305         /* clear VALID to get value calculated */
1306         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1307 }
1308
1309 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1310 {
1311         struct symbol *sym, *csym;
1312         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1313                                          * pty: probability of tristate = y
1314                                          * ptm: probability of tristate = m
1315                                          */
1316
1317         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1318                                    * below, otherwise gcc whines about
1319                                    * -Wmaybe-uninitialized */
1320         if (mode == def_random) {
1321                 int n, p[3];
1322                 char *env = getenv("KCONFIG_PROBABILITY");
1323                 n = 0;
1324                 while( env && *env ) {
1325                         char *endp;
1326                         int tmp = strtol( env, &endp, 10 );
1327                         if( tmp >= 0 && tmp <= 100 ) {
1328                                 p[n++] = tmp;
1329                         } else {
1330                                 errno = ERANGE;
1331                                 perror( "KCONFIG_PROBABILITY" );
1332                                 exit( 1 );
1333                         }
1334                         env = (*endp == ':') ? endp+1 : endp;
1335                         if( n >=3 ) {
1336                                 break;
1337                         }
1338                 }
1339                 switch( n ) {
1340                 case 1:
1341                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1342                         break;
1343                 case 2:
1344                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1345                         break;
1346                 case 3:
1347                         pby = p[0]; pty = p[1]; ptm = p[2];
1348                         break;
1349                 }
1350
1351                 if( pty+ptm > 100 ) {
1352                         errno = ERANGE;
1353                         perror( "KCONFIG_PROBABILITY" );
1354                         exit( 1 );
1355                 }
1356         }
1357         bool has_changed = false;
1358
1359         for_all_symbols(i, sym) {
1360                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1361                         continue;
1362                 switch (sym_get_type(sym)) {
1363                 case S_BOOLEAN:
1364                 case S_TRISTATE:
1365                         has_changed = true;
1366                         switch (mode) {
1367                         case def_yes:
1368                                 sym->def[S_DEF_USER].tri = yes;
1369                                 break;
1370                         case def_mod:
1371                                 sym->def[S_DEF_USER].tri = mod;
1372                                 break;
1373                         case def_no:
1374                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1375                                         sym->def[S_DEF_USER].tri = yes;
1376                                 else
1377                                         sym->def[S_DEF_USER].tri = no;
1378                                 break;
1379                         case def_random:
1380                                 sym->def[S_DEF_USER].tri = no;
1381                                 cnt = rand() % 100;
1382                                 if (sym->type == S_TRISTATE) {
1383                                         if (cnt < pty)
1384                                                 sym->def[S_DEF_USER].tri = yes;
1385                                         else if (cnt < (pty+ptm))
1386                                                 sym->def[S_DEF_USER].tri = mod;
1387                                 } else if (cnt < pby)
1388                                         sym->def[S_DEF_USER].tri = yes;
1389                                 break;
1390                         default:
1391                                 continue;
1392                         }
1393                         if (!(sym_is_choice(sym) && mode == def_random))
1394                                 sym->flags |= SYMBOL_DEF_USER;
1395                         break;
1396                 default:
1397                         break;
1398                 }
1399
1400         }
1401
1402         sym_clear_all_valid();
1403
1404         /*
1405          * We have different type of choice blocks.
1406          * If curr.tri equals to mod then we can select several
1407          * choice symbols in one block.
1408          * In this case we do nothing.
1409          * If curr.tri equals yes then only one symbol can be
1410          * selected in a choice block and we set it to yes,
1411          * and the rest to no.
1412          */
1413         if (mode != def_random) {
1414                 for_all_symbols(i, csym) {
1415                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1416                             sym_is_choice_value(csym))
1417                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1418                 }
1419         }
1420
1421         for_all_symbols(i, csym) {
1422                 if (sym_has_value(csym) || !sym_is_choice(csym))
1423                         continue;
1424
1425                 sym_calc_value(csym);
1426                 if (mode == def_random)
1427                         has_changed = randomize_choice_values(csym);
1428                 else {
1429                         set_all_choice_values(csym);
1430                         has_changed = true;
1431                 }
1432         }
1433
1434         return has_changed;
1435 }