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/generated/auto.conf";
 232 }
 233
 234 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 235 {
 236         char *p2;
 237
 238         switch (sym->type) {
 239         case S_TRISTATE:
 240                 if (p[0] == 'm') {
 241                         sym->def[def].tri = mod;
 242                         sym->flags |= def_flags;
 243                         break;
 244                 }
 245                 /* fall through */
 246         case S_BOOLEAN:
 247                 if (p[0] == 'y') {
 248                         sym->def[def].tri = yes;
 249                         sym->flags |= def_flags;
 250                         break;
 251                 }
 252                 if (p[0] == 'n') {
 253                         sym->def[def].tri = no;
 254                         sym->flags |= def_flags;
 255                         break;
 256                 }
 257                 if (def != S_DEF_AUTO)
 258                         conf_warning("symbol value '%s' invalid for %s",
 259                                      p, sym->name);
 260                 return 1;
 261         case S_STRING:
 262                 if (*p++ != '"')
 263                         break;
 264                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 265                         if (*p2 == '"') {
 266                                 *p2 = 0;
 267                                 break;
 268                         }
 269                         memmove(p2, p2 + 1, strlen(p2));
 270                 }
 271                 if (!p2) {
 272                         if (def != S_DEF_AUTO)
 273                                 conf_warning("invalid string found");
 274                         return 1;
 275                 }
 276                 /* fall through */
 277         case S_INT:
 278         case S_HEX:
 279                 if (sym_string_valid(sym, p)) {
 280                         sym->def[def].val = xstrdup(p);
 281                         sym->flags |= def_flags;
 282                 } else {
 283                         if (def != S_DEF_AUTO)
 284                                 conf_warning("symbol value '%s' invalid for %s",
 285                                              p, sym->name);
 286                         return 1;
 287                 }
 288                 break;
 289         default:
 290                 ;
 291         }
 292         return 0;
 293 }
 294
 295 #define LINE_GROWTH 16
 296 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 297 {
 298         char *nline;
 299         size_t new_size = slen + 1;
 300         if (new_size > *n) {
 301                 new_size += LINE_GROWTH - 1;
 302                 new_size *= 2;
 303                 nline = xrealloc(*lineptr, new_size);
 304                 if (!nline)
 305                         return -1;
 306
 307                 *lineptr = nline;
 308                 *n = new_size;
 309         }
 310
 311         (*lineptr)[slen] = c;
 312
 313         return 0;
 314 }
 315
 316 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
 317 {
 318         char *line = *lineptr;
 319         size_t slen = 0;
 320
 321         for (;;) {
 322                 int c = getc(stream);
 323
 324                 switch (c) {
 325                 case '\n':
 326                         if (add_byte(c, &line, slen, n) < 0)
 327                                 goto e_out;
 328                         slen++;
 329                         /* fall through */
 330                 case EOF:
 331                         if (add_byte('\0', &line, slen, n) < 0)
 332                                 goto e_out;
 333                         *lineptr = line;
 334                         if (slen == 0)
 335                                 return -1;
 336                         return slen;
 337                 default:
 338                         if (add_byte(c, &line, slen, n) < 0)
 339                                 goto e_out;
 340                         slen++;
 341                 }
 342         }
 343
 344 e_out:
 345         line[slen-1] = '\0';
 346         *lineptr = line;
 347         return -1;
 348 }
 349
 350 int conf_read_simple(const char *name, int def)
 351 {
 352         FILE *in = NULL;
 353         char   *line = NULL;
 354         size_t  line_asize = 0;
 355         char *p, *p2;
 356         struct symbol *sym;
 357         int i, def_flags;
 358
 359         if (name) {
 360                 in = zconf_fopen(name);
 361         } else {
 362                 struct property *prop;
 363
 364                 name = conf_get_configname();
 365                 in = zconf_fopen(name);
 366                 if (in)
 367                         goto load;
 368                 sym_add_change_count(1);
 369                 if (!sym_defconfig_list)
 370                         return 1;
 371
 372                 for_all_defaults(sym_defconfig_list, prop) {
 373                         if (expr_calc_value(prop->visible.expr) == no ||
 374                             prop->expr->type != E_SYMBOL)
 375                                 continue;
 376                         sym_calc_value(prop->expr->left.sym);
 377                         name = sym_get_string_value(prop->expr->left.sym);
 378                         in = zconf_fopen(name);
 379                         if (in) {
 380                                 conf_message("using defaults found in %s",
 381                                          name);
 382                                 goto load;
 383                         }
 384                 }
 385         }
 386         if (!in)
 387                 return 1;
 388
 389 load:
 390         conf_filename = name;
 391         conf_lineno = 0;
 392         conf_warnings = 0;
 393
 394         def_flags = SYMBOL_DEF << def;
 395         for_all_symbols(i, sym) {
 396                 sym->flags |= SYMBOL_CHANGED;
 397                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 398                 if (sym_is_choice(sym))
 399                         sym->flags |= def_flags;
 400                 switch (sym->type) {
 401                 case S_INT:
 402                 case S_HEX:
 403                 case S_STRING:
 404                         if (sym->def[def].val)
 405                                 free(sym->def[def].val);
 406                         /* fall through */
 407                 default:
 408                         sym->def[def].val = NULL;
 409                         sym->def[def].tri = no;
 410                 }
 411         }
 412
 413         while (compat_getline(&line, &line_asize, in) != -1) {
 414                 conf_lineno++;
 415                 sym = NULL;
 416                 if (line[0] == '#') {
 417                         if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 418                                 continue;
 419                         p = strchr(line + 2 + strlen(CONFIG_), ' ');
 420                         if (!p)
 421                                 continue;
 422                         *p++ = 0;
 423                         if (strncmp(p, "is not set", 10))
 424                                 continue;
 425                         if (def == S_DEF_USER) {
 426                                 sym = sym_find(line + 2 + strlen(CONFIG_));
 427                                 if (!sym) {
 428                                         sym_add_change_count(1);
 429                                         continue;
 430                                 }
 431                         } else {
 432                                 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
 433                                 if (sym->type == S_UNKNOWN)
 434                                         sym->type = S_BOOLEAN;
 435                         }
 436                         if (sym->flags & def_flags) {
 437                                 conf_warning("override: reassigning to symbol %s", sym->name);
 438                         }
 439                         switch (sym->type) {
 440                         case S_BOOLEAN:
 441                         case S_TRISTATE:
 442                                 sym->def[def].tri = no;
 443                                 sym->flags |= def_flags;
 444                                 break;
 445                         default:
 446                                 ;
 447                         }
 448                 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
 449                         p = strchr(line + strlen(CONFIG_), '=');
 450                         if (!p)
 451                                 continue;
 452                         *p++ = 0;
 453                         p2 = strchr(p, '\n');
 454                         if (p2) {
 455                                 *p2-- = 0;
 456                                 if (*p2 == '\r')
 457                                         *p2 = 0;
 458                         }
 459
 460                         sym = sym_find(line + strlen(CONFIG_));
 461                         if (!sym) {
 462                                 if (def == S_DEF_AUTO)
 463                                         /*
 464                                          * Reading from include/config/auto.conf
 465                                          * If CONFIG_FOO previously existed in
 466                                          * auto.conf but it is missing now,
 467                                          * include/config/foo.h must be touched.
 468                                          */
 469                                         conf_touch_dep(line + strlen(CONFIG_));
 470                                 else
 471                                         sym_add_change_count(1);
 472                                 continue;
 473                         }
 474
 475                         if (sym->flags & def_flags) {
 476                                 conf_warning("override: reassigning to symbol %s", sym->name);
 477                         }
 478                         if (conf_set_sym_val(sym, def, def_flags, p))
 479                                 continue;
 480                 } else {
 481                         if (line[0] != '\r' && line[0] != '\n')
 482                                 conf_warning("unexpected data: %.*s",
 483                                              (int)strcspn(line, "\r\n"), line);
 484
 485                         continue;
 486                 }
 487
 488                 if (sym && sym_is_choice_value(sym)) {
 489                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 490                         switch (sym->def[def].tri) {
 491                         case no:
 492                                 break;
 493                         case mod:
 494                                 if (cs->def[def].tri == yes) {
 495                                         conf_warning("%s creates inconsistent choice state", sym->name);
 496                                         cs->flags &= ~def_flags;
 497                                 }
 498                                 break;
 499                         case yes:
 500                                 if (cs->def[def].tri != no)
 501                                         conf_warning("override: %s changes choice state", sym->name);
 502                                 cs->def[def].val = sym;
 503                                 break;
 504                         }
 505                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 506                 }
 507         }
 508         free(line);
 509         fclose(in);
 510         return 0;
 511 }
 512
 513 int conf_read(const char *name)
 514 {
 515         struct symbol *sym;
 516         int conf_unsaved = 0;
 517         int i;
 518
 519         sym_set_change_count(0);
 520
 521         if (conf_read_simple(name, S_DEF_USER)) {
 522                 sym_calc_value(modules_sym);
 523                 return 1;
 524         }
 525
 526         sym_calc_value(modules_sym);
 527
 528         for_all_symbols(i, sym) {
 529                 sym_calc_value(sym);
 530                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 531                         continue;
 532                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 533                         /* check that calculated value agrees with saved value */
 534                         switch (sym->type) {
 535                         case S_BOOLEAN:
 536                         case S_TRISTATE:
 537                                 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
 538                                         continue;
 539                                 break;
 540                         default:
 541                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 542                                         continue;
 543                                 break;
 544                         }
 545                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 546                         /* no previous value and not saved */
 547                         continue;
 548                 conf_unsaved++;
 549                 /* maybe print value in verbose mode... */
 550         }
 551
 552         for_all_symbols(i, sym) {
 553                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 554                         /* Reset values of generates values, so they'll appear
 555                          * as new, if they should become visible, but that
 556                          * doesn't quite work if the Kconfig and the saved
 557                          * configuration disagree.
 558                          */
 559                         if (sym->visible == no && !conf_unsaved)
 560                                 sym->flags &= ~SYMBOL_DEF_USER;
 561                         switch (sym->type) {
 562                         case S_STRING:
 563                         case S_INT:
 564                         case S_HEX:
 565                                 /* Reset a string value if it's out of range */
 566                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 567                                         break;
 568                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 569                                 conf_unsaved++;
 570                                 break;
 571                         default:
 572                                 break;
 573                         }
 574                 }
 575         }
 576
 577         sym_add_change_count(conf_warnings || conf_unsaved);
 578
 579         return 0;
 580 }
 581
 582 /*
 583  * Kconfig configuration printer
 584  *
 585  * This printer is used when generating the resulting configuration after
 586  * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
 587  * passing a non-NULL argument to the printer.
 588  *
 589  */
 590 static void
 591 kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 592 {
 593
 594         switch (sym->type) {
 595         case S_BOOLEAN:
 596         case S_TRISTATE:
 597                 if (*value == 'n') {
 598                         bool skip_unset = (arg != NULL);
 599
 600                         if (!skip_unset)
 601                                 fprintf(fp, "# %s%s is not set\n",
 602                                     CONFIG_, sym->name);
 603                         return;
 604                 }
 605                 break;
 606         default:
 607                 break;
 608         }
 609
 610         fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
 611 }
 612
 613 static void
 614 kconfig_print_cmake_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 615 {
 616
 617         switch (sym->type) {
 618         case S_BOOLEAN:
 619         case S_TRISTATE:
 620                 if (*value == 'n') {
 621                         bool skip_unset = (arg != NULL);
 622
 623                         if (!skip_unset)
 624                                 fprintf(fp, "set(%s%s false)\n",
 625                                         CONFIG_, sym->name, value);
 626                         return;
 627                 } else if (*value == 'm') {
 628                         abort();
 629                 } else {
 630                         fprintf(fp, "set(%s%s true)\n", CONFIG_, sym->name, value);
 631                 }
 632                 break;
 633         case S_HEX: {
 634                 const char *prefix = "";
 635
 636                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 637                         prefix = "0x";
 638                 fprintf(fp, "set(%s%s %s%s)\n",
 639                     CONFIG_, sym->name, prefix, value);
 640                 break;
 641         }
 642         case S_STRING:
 643         case S_INT:
 644                 fprintf(fp, "set(%s%s %s)\n",
 645                     CONFIG_, sym->name, value);
 646                 break;
 647         default:
 648                 break;
 649         }
 650
 651 }
 652
 653 static void
 654 kconfig_print_comment(FILE *fp, const char *value, void *arg)
 655 {
 656         const char *p = value;
 657         size_t l;
 658
 659         for (;;) {
 660                 l = strcspn(p, "\n");
 661                 fprintf(fp, "#");
 662                 if (l) {
 663                         fprintf(fp, " ");
 664                         xfwrite(p, l, 1, fp);
 665                         p += l;
 666                 }
 667                 fprintf(fp, "\n");
 668                 if (*p++ == '\0')
 669                         break;
 670         }
 671 }
 672
 673 static struct conf_printer kconfig_printer_cb =
 674 {
 675         .print_symbol = kconfig_print_symbol,
 676         .print_comment = kconfig_print_comment,
 677 };
 678
 679 static struct conf_printer kconfig_printer_cmake_cb =
 680 {
 681         .print_symbol = kconfig_print_cmake_symbol,
 682         .print_comment = kconfig_print_comment,
 683 };
 684
 685 /*
 686  * Header printer
 687  *
 688  * This printer is used when generating the `include/generated/autoconf.h' file.
 689  */
 690 static void
 691 header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
 692 {
 693
 694         switch (sym->type) {
 695         case S_BOOLEAN:
 696         case S_TRISTATE: {
 697                 const char *suffix = "";
 698
 699                 switch (*value) {
 700                 case 'n':
 701                         break;
 702                 case 'm':
 703                         suffix = "_MODULE";
 704                         /* fall through */
 705                 default:
 706                         fprintf(fp, "#define %s%s%s 1\n",
 707                             CONFIG_, sym->name, suffix);
 708                 }
 709                 break;
 710         }
 711         case S_HEX: {
 712                 const char *prefix = "";
 713
 714                 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 715                         prefix = "0x";
 716                 fprintf(fp, "#define %s%s %s%s\n",
 717                     CONFIG_, sym->name, prefix, value);
 718                 break;
 719         }
 720         case S_STRING:
 721         case S_INT:
 722                 fprintf(fp, "#define %s%s %s\n",
 723                     CONFIG_, sym->name, value);
 724                 break;
 725         default:
 726                 break;
 727         }
 728
 729 }
 730
 731 static void
 732 header_print_comment(FILE *fp, const char *value, void *arg)
 733 {
 734         const char *p = value;
 735         size_t l;
 736
 737         fprintf(fp, "/*\n");
 738         for (;;) {
 739                 l = strcspn(p, "\n");
 740                 fprintf(fp, " *");
 741                 if (l) {
 742                         fprintf(fp, " ");
 743                         xfwrite(p, l, 1, fp);
 744                         p += l;
 745                 }
 746                 fprintf(fp, "\n");
 747                 if (*p++ == '\0')
 748                         break;
 749         }
 750         fprintf(fp, " */\n");
 751 }
 752
 753 static struct conf_printer header_printer_cb =
 754 {
 755         .print_symbol = header_print_symbol,
 756         .print_comment = header_print_comment,
 757 };
 758
 759 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 760                               struct conf_printer *printer, void *printer_arg)
 761 {
 762         const char *str;
 763
 764         switch (sym->type) {
 765         case S_UNKNOWN:
 766                 break;
 767         case S_STRING:
 768                 str = sym_get_string_value(sym);
 769                 str = sym_escape_string_value(str);
 770                 printer->print_symbol(fp, sym, str, printer_arg);
 771                 free((void *)str);
 772                 break;
 773         default:
 774                 str = sym_get_string_value(sym);
 775                 printer->print_symbol(fp, sym, str, printer_arg);
 776         }
 777 }
 778
 779 static void
 780 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
 781 {
 782         char buf[256];
 783
 784         snprintf(buf, sizeof(buf),
 785             "\n"
 786             "Automatically generated file; DO NOT EDIT.\n"
 787             "%s\n",
 788             rootmenu.prompt->text);
 789
 790         printer->print_comment(fp, buf, printer_arg);
 791 }
 792
 793 /*
 794  * Write out a minimal config.
 795  * All values that has default values are skipped as this is redundant.
 796  */
 797 int conf_write_defconfig(const char *filename)
 798 {
 799         struct symbol *sym;
 800         struct menu *menu;
 801         FILE *out;
 802
 803         out = fopen(filename, "w");
 804         if (!out)
 805                 return 1;
 806
 807         sym_clear_all_valid();
 808
 809         /* Traverse all menus to find all relevant symbols */
 810         menu = rootmenu.list;
 811
 812         while (menu != NULL)
 813         {
 814                 sym = menu->sym;
 815                 if (sym == NULL) {
 816                         if (!menu_is_visible(menu))
 817                                 goto next_menu;
 818                 } else if (!sym_is_choice(sym)) {
 819                         sym_calc_value(sym);
 820                         if (!(sym->flags & SYMBOL_WRITE))
 821                                 goto next_menu;
 822                         sym->flags &= ~SYMBOL_WRITE;
 823                         /* If we cannot change the symbol - skip */
 824                         if (!sym_is_changeable(sym))
 825                                 goto next_menu;
 826                         /* If symbol equals to default value - skip */
 827                         if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
 828                                 goto next_menu;
 829
 830                         /*
 831                          * If symbol is a choice value and equals to the
 832                          * default for a choice - skip.
 833                          * But only if value is bool and equal to "y" and
 834                          * choice is not "optional".
 835                          * (If choice is "optional" then all values can be "n")
 836                          */
 837                         if (sym_is_choice_value(sym)) {
 838                                 struct symbol *cs;
 839                                 struct symbol *ds;
 840
 841                                 cs = prop_get_symbol(sym_get_choice_prop(sym));
 842                                 ds = sym_choice_default(cs);
 843                                 if (!sym_is_optional(cs) && sym == ds) {
 844                                         if ((sym->type == S_BOOLEAN) &&
 845                                             sym_get_tristate_value(sym) == yes)
 846                                                 goto next_menu;
 847                                 }
 848                         }
 849                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 850                 }
 851 next_menu:
 852                 if (menu->list != NULL) {
 853                         menu = menu->list;
 854                 }
 855                 else if (menu->next != NULL) {
 856                         menu = menu->next;
 857                 } else {
 858                         while ((menu = menu->parent)) {
 859                                 if (menu->next != NULL) {
 860                                         menu = menu->next;
 861                                         break;
 862                                 }
 863                         }
 864                 }
 865         }
 866         fclose(out);
 867         return 0;
 868 }
 869
 870 int conf_write(const char *name)
 871 {
 872         FILE *out;
 873         struct symbol *sym;
 874         struct menu *menu;
 875         const char *str;
 876         char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 877         char *env;
 878         int i;
 879         bool need_newline = false;
 880
 881         if (!name)
 882                 name = conf_get_configname();
 883
 884         if (!*name) {
 885                 fprintf(stderr, "config name is empty\n");
 886                 return -1;
 887         }
 888
 889         if (is_dir(name)) {
 890                 fprintf(stderr, "%s: Is a directory\n", name);
 891                 return -1;
 892         }
 893
 894         if (make_parent_dir(name))
 895                 return -1;
 896
 897         env = getenv("KCONFIG_OVERWRITECONFIG");
 898         if (env && *env) {
 899                 *tmpname = 0;
 900                 out = fopen(name, "w");
 901         } else {
 902                 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
 903                          name, (int)getpid());
 904                 out = fopen(tmpname, "w");
 905         }
 906         if (!out)
 907                 return 1;
 908
 909         conf_write_heading(out, &kconfig_printer_cb, NULL);
 910
 911         if (!conf_get_changed())
 912                 sym_clear_all_valid();
 913
 914         menu = rootmenu.list;
 915         while (menu) {
 916                 sym = menu->sym;
 917                 if (!sym) {
 918                         if (!menu_is_visible(menu))
 919                                 goto next;
 920                         str = menu_get_prompt(menu);
 921                         fprintf(out, "\n"
 922                                      "#\n"
 923                                      "# %s\n"
 924                                      "#\n", str);
 925                         need_newline = false;
 926                 } else if (!(sym->flags & SYMBOL_CHOICE) &&
 927                            !(sym->flags & SYMBOL_WRITTEN)) {
 928                         sym_calc_value(sym);
 929                         if (!(sym->flags & SYMBOL_WRITE))
 930                                 goto next;
 931                         if (need_newline) {
 932                                 fprintf(out, "\n");
 933                                 need_newline = false;
 934                         }
 935                         sym->flags |= SYMBOL_WRITTEN;
 936                         conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 937                 }
 938
 939 next:
 940                 if (menu->list) {
 941                         menu = menu->list;
 942                         continue;
 943                 }
 944                 if (menu->next)
 945                         menu = menu->next;
 946                 else while ((menu = menu->parent)) {
 947                         if (!menu->sym && menu_is_visible(menu) &&
 948                             menu != &rootmenu) {
 949                                 str = menu_get_prompt(menu);
 950                                 fprintf(out, "# end of %s\n", str);
 951                                 need_newline = true;
 952                         }
 953                         if (menu->next) {
 954                                 menu = menu->next;
 955                                 break;
 956                         }
 957                 }
 958         }
 959         fclose(out);
 960
 961         for_all_symbols(i, sym)
 962                 sym->flags &= ~SYMBOL_WRITTEN;
 963
 964         if (*tmpname) {
 965                 if (is_same(name, tmpname)) {
 966                         conf_message("No change to %s", name);
 967                         unlink(tmpname);
 968                         sym_set_change_count(0);
 969                         return 0;
 970                 }
 971
 972                 snprintf(oldname, sizeof(oldname), "%s.old", name);
 973                 rename(name, oldname);
 974                 if (rename(tmpname, name))
 975                         return 1;
 976         }
 977
 978         conf_message("configuration written to %s", name);
 979
 980         sym_set_change_count(0);
 981
 982         return 0;
 983 }
 984
 985 /* write a dependency file as used by kbuild to track dependencies */
 986 static int conf_write_dep(const char *name)
 987 {
 988         struct file *file;
 989         FILE *out;
 990
 991         out = fopen("..config.tmp", "w");
 992         if (!out)
 993                 return 1;
 994         fprintf(out, "deps_config := \\\n");
 995         for (file = file_list; file; file = file->next) {
 996                 if (file->next)
 997                         fprintf(out, "\t%s \\\n", file->name);
 998                 else
 999                         fprintf(out, "\t%s\n", file->name);
1000         }
1001         fprintf(out, "\n%s: \\\n"
1002                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
1003
1004         env_write_dep(out, conf_get_autoconfig_name());
1005
1006         fprintf(out, "\n$(deps_config): ;\n");
1007         fclose(out);
1008
1009         if (make_parent_dir(name))
1010                 return 1;
1011         rename("..config.tmp", name);
1012         return 0;
1013 }
1014
1015 static int conf_touch_deps(void)
1016 {
1017         const char *name;
1018         struct symbol *sym;
1019         int res, i;
1020
1021         strcpy(depfile_path, "include/generated/");
1022         depfile_prefix_len = strlen(depfile_path);
1023
1024         name = conf_get_autoconfig_name();
1025         conf_read_simple(name, S_DEF_AUTO);
1026         sym_calc_value(modules_sym);
1027
1028         for_all_symbols(i, sym) {
1029                 sym_calc_value(sym);
1030                 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1031                         continue;
1032                 if (sym->flags & SYMBOL_WRITE) {
1033                         if (sym->flags & SYMBOL_DEF_AUTO) {
1034                                 /*
1035                                  * symbol has old and new value,
1036                                  * so compare them...
1037                                  */
1038                                 switch (sym->type) {
1039                                 case S_BOOLEAN:
1040                                 case S_TRISTATE:
1041                                         if (sym_get_tristate_value(sym) ==
1042                                             sym->def[S_DEF_AUTO].tri)
1043                                                 continue;
1044                                         break;
1045                                 case S_STRING:
1046                                 case S_HEX:
1047                                 case S_INT:
1048                                         if (!strcmp(sym_get_string_value(sym),
1049                                                     sym->def[S_DEF_AUTO].val))
1050                                                 continue;
1051                                         break;
1052                                 default:
1053                                         break;
1054                                 }
1055                         } else {
1056                                 /*
1057                                  * If there is no old value, only 'no' (unset)
1058                                  * is allowed as new value.
1059                                  */
1060                                 switch (sym->type) {
1061                                 case S_BOOLEAN:
1062                                 case S_TRISTATE:
1063                                         if (sym_get_tristate_value(sym) == no)
1064                                                 continue;
1065                                         break;
1066                                 default:
1067                                         break;
1068                                 }
1069                         }
1070                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1071                         /* There is neither an old nor a new value. */
1072                         continue;
1073                 /* else
1074                  *      There is an old value, but no new value ('no' (unset)
1075                  *      isn't saved in auto.conf, so the old value is always
1076                  *      different from 'no').
1077                  */
1078
1079                 res = conf_touch_dep(sym->name);
1080                 if (res)
1081                         return res;
1082         }
1083
1084         return 0;
1085 }
1086
1087 int conf_write_autoconf(int overwrite)
1088 {
1089         struct symbol *sym;
1090         const char *name;
1091         const char *autoconf_name = conf_get_autoconfig_name();
1092         FILE *out, *out_h, *out_c;
1093         int i;
1094
1095         if (!overwrite && is_present(autoconf_name))
1096                 return 0;
1097
1098         conf_write_dep("include/generated/auto.conf.cmd");
1099
1100         if (conf_touch_deps())
1101                 return 1;
1102
1103         out = fopen(".tmpconfig", "w");
1104         if (!out)
1105                 return 1;
1106
1107         out_h = fopen(".tmpconfig.h", "w");
1108         if (!out_h) {
1109                 fclose(out);
1110                 return 1;
1111         }
1112
1113         out_c = fopen(".tmpconfig.cmake", "w");
1114         if (!out_c) {
1115                 fclose(out);
1116                 fclose(out_h);
1117         }
1118
1119         conf_write_heading(out, &kconfig_printer_cb, NULL);
1120
1121         conf_write_heading(out_h, &header_printer_cb, NULL);
1122
1123         conf_write_heading(out_c, &kconfig_printer_cmake_cb, NULL);
1124
1125         for_all_symbols(i, sym) {
1126                 sym_calc_value(sym);
1127                 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1128                         continue;
1129
1130                 /* write symbol to auto.conf and header files */
1131                 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1132
1133                 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1134
1135                 conf_write_symbol(out_c, sym, &kconfig_printer_cmake_cb, NULL);
1136         }
1137         fclose(out);
1138         fclose(out_h);
1139         fclose(out_c);
1140
1141         name = getenv("KCONFIG_AUTOHEADER");
1142         if (!name)
1143                 name = "include/generated/autoconf.h";
1144         if (make_parent_dir(name))
1145                 return 1;
1146         if (rename(".tmpconfig.h", name))
1147                 return 1;
1148
1149         if (make_parent_dir(autoconf_name))
1150                 return 1;
1151
1152         name = getenv("KCONFIG_CMAKE");
1153         if (!name)
1154                 name = "config.cmake";
1155         if (make_parent_dir(name))
1156                 return 1;
1157         if (rename(".tmpconfig.cmake", name))
1158                 return 1;
1159
1160         /*
1161          * This must be the last step, kbuild has a dependency on auto.conf
1162          * and this marks the successful completion of the previous steps.
1163          */
1164         if (rename(".tmpconfig", autoconf_name))
1165                 return 1;
1166
1167         return 0;
1168 }
1169
1170 static int sym_change_count;
1171 static void (*conf_changed_callback)(void);
1172
1173 void sym_set_change_count(int count)
1174 {
1175         int _sym_change_count = sym_change_count;
1176         sym_change_count = count;
1177         if (conf_changed_callback &&
1178             (bool)_sym_change_count != (bool)count)
1179                 conf_changed_callback();
1180 }
1181
1182 void sym_add_change_count(int count)
1183 {
1184         sym_set_change_count(count + sym_change_count);
1185 }
1186
1187 bool conf_get_changed(void)
1188 {
1189         return sym_change_count;
1190 }
1191
1192 void conf_set_changed_callback(void (*fn)(void))
1193 {
1194         conf_changed_callback = fn;
1195 }
1196
1197 static bool randomize_choice_values(struct symbol *csym)
1198 {
1199         struct property *prop;
1200         struct symbol *sym;
1201         struct expr *e;
1202         int cnt, def;
1203
1204         /*
1205          * If choice is mod then we may have more items selected
1206          * and if no then no-one.
1207          * In both cases stop.
1208          */
1209         if (csym->curr.tri != yes)
1210                 return false;
1211
1212         prop = sym_get_choice_prop(csym);
1213
1214         /* count entries in choice block */
1215         cnt = 0;
1216         expr_list_for_each_sym(prop->expr, e, sym)
1217                 cnt++;
1218
1219         /*
1220          * find a random value and set it to yes,
1221          * set the rest to no so we have only one set
1222          */
1223         def = (rand() % cnt);
1224
1225         cnt = 0;
1226         expr_list_for_each_sym(prop->expr, e, sym) {
1227                 if (def == cnt++) {
1228                         sym->def[S_DEF_USER].tri = yes;
1229                         csym->def[S_DEF_USER].val = sym;
1230                 }
1231                 else {
1232                         sym->def[S_DEF_USER].tri = no;
1233                 }
1234                 sym->flags |= SYMBOL_DEF_USER;
1235                 /* clear VALID to get value calculated */
1236                 sym->flags &= ~SYMBOL_VALID;
1237         }
1238         csym->flags |= SYMBOL_DEF_USER;
1239         /* clear VALID to get value calculated */
1240         csym->flags &= ~(SYMBOL_VALID);
1241
1242         return true;
1243 }
1244
1245 void set_all_choice_values(struct symbol *csym)
1246 {
1247         struct property *prop;
1248         struct symbol *sym;
1249         struct expr *e;
1250
1251         prop = sym_get_choice_prop(csym);
1252
1253         /*
1254          * Set all non-assinged choice values to no
1255          */
1256         expr_list_for_each_sym(prop->expr, e, sym) {
1257                 if (!sym_has_value(sym))
1258                         sym->def[S_DEF_USER].tri = no;
1259         }
1260         csym->flags |= SYMBOL_DEF_USER;
1261         /* clear VALID to get value calculated */
1262         csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1263 }
1264
1265 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1266 {
1267         struct symbol *sym, *csym;
1268         int i, cnt, pby, pty, ptm;      /* pby: probability of bool     = y
1269                                          * pty: probability of tristate = y
1270                                          * ptm: probability of tristate = m
1271                                          */
1272
1273         pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1274                                    * below, otherwise gcc whines about
1275                                    * -Wmaybe-uninitialized */
1276         if (mode == def_random) {
1277                 int n, p[3];
1278                 char *env = getenv("KCONFIG_PROBABILITY");
1279                 n = 0;
1280                 while( env && *env ) {
1281                         char *endp;
1282                         int tmp = strtol( env, &endp, 10 );
1283                         if( tmp >= 0 && tmp <= 100 ) {
1284                                 p[n++] = tmp;
1285                         } else {
1286                                 errno = ERANGE;
1287                                 perror( "KCONFIG_PROBABILITY" );
1288                                 exit( 1 );
1289                         }
1290                         env = (*endp == ':') ? endp+1 : endp;
1291                         if( n >=3 ) {
1292                                 break;
1293                         }
1294                 }
1295                 switch( n ) {
1296                 case 1:
1297                         pby = p[0]; ptm = pby/2; pty = pby-ptm;
1298                         break;
1299                 case 2:
1300                         pty = p[0]; ptm = p[1]; pby = pty + ptm;
1301                         break;
1302                 case 3:
1303                         pby = p[0]; pty = p[1]; ptm = p[2];
1304                         break;
1305                 }
1306
1307                 if( pty+ptm > 100 ) {
1308                         errno = ERANGE;
1309                         perror( "KCONFIG_PROBABILITY" );
1310                         exit( 1 );
1311                 }
1312         }
1313         bool has_changed = false;
1314
1315         for_all_symbols(i, sym) {
1316                 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1317                         continue;
1318                 switch (sym_get_type(sym)) {
1319                 case S_BOOLEAN:
1320                 case S_TRISTATE:
1321                         has_changed = true;
1322                         switch (mode) {
1323                         case def_yes:
1324                                 sym->def[S_DEF_USER].tri = yes;
1325                                 break;
1326                         case def_mod:
1327                                 sym->def[S_DEF_USER].tri = mod;
1328                                 break;
1329                         case def_no:
1330                                 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1331                                         sym->def[S_DEF_USER].tri = yes;
1332                                 else
1333                                         sym->def[S_DEF_USER].tri = no;
1334                                 break;
1335                         case def_random:
1336                                 sym->def[S_DEF_USER].tri = no;
1337                                 cnt = rand() % 100;
1338                                 if (sym->type == S_TRISTATE) {
1339                                         if (cnt < pty)
1340                                                 sym->def[S_DEF_USER].tri = yes;
1341                                         else if (cnt < (pty+ptm))
1342                                                 sym->def[S_DEF_USER].tri = mod;
1343                                 } else if (cnt < pby)
1344                                         sym->def[S_DEF_USER].tri = yes;
1345                                 break;
1346                         default:
1347                                 continue;
1348                         }
1349                         if (!(sym_is_choice(sym) && mode == def_random))
1350                                 sym->flags |= SYMBOL_DEF_USER;
1351                         break;
1352                 default:
1353                         break;
1354                 }
1355
1356         }
1357
1358         sym_clear_all_valid();
1359
1360         /*
1361          * We have different type of choice blocks.
1362          * If curr.tri equals to mod then we can select several
1363          * choice symbols in one block.
1364          * In this case we do nothing.
1365          * If curr.tri equals yes then only one symbol can be
1366          * selected in a choice block and we set it to yes,
1367          * and the rest to no.
1368          */
1369         if (mode != def_random) {
1370                 for_all_symbols(i, csym) {
1371                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1372                             sym_is_choice_value(csym))
1373                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1374                 }
1375         }
1376
1377         for_all_symbols(i, csym) {
1378                 if (sym_has_value(csym) || !sym_is_choice(csym))
1379                         continue;
1380
1381                 sym_calc_value(csym);
1382                 if (mode == def_random)
1383                         has_changed |= randomize_choice_values(csym);
1384                 else {
1385                         set_all_choice_values(csym);
1386                         has_changed = true;
1387                 }
1388         }
1389
1390         return has_changed;
1391 }
1392
1393 void conf_rewrite_mod_or_yes(enum conf_def_mode mode)
1394 {
1395         struct symbol *sym;
1396         int i;
1397         tristate old_val = (mode == def_y2m) ? yes : mod;
1398         tristate new_val = (mode == def_y2m) ? mod : yes;
1399
1400         for_all_symbols(i, sym) {
1401                 if (sym_get_type(sym) == S_TRISTATE &&
1402                     sym->def[S_DEF_USER].tri == old_val)
1403                         sym->def[S_DEF_USER].tri = new_val;
1404         }
1405         sym_clear_all_valid();
1406 }