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