1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org> 4 */ 5 6 #include <sys/mman.h> 7 #include <sys/stat.h> 8 #include <sys/types.h> 9 #include <ctype.h> 10 #include <errno.h> 11 #include <fcntl.h> 12 #include <limits.h> 13 #include <stdarg.h> 14 #include <stdbool.h> 15 #include <stdio.h> 16 #include <stdlib.h> 17 #include <string.h> 18 #include <time.h> 19 #include <unistd.h> 20 21 #include "internal.h" 22 #include "lkc.h" 23 24 struct gstr autoconf_cmd; 25 26 /* return true if 'path' exists, false otherwise */ 27 static bool is_present(const char *path) 28 { 29 struct stat st; 30 31 return !stat(path, &st); 32 } 33 34 /* return true if 'path' exists and it is a directory, false otherwise */ 35 static bool is_dir(const char *path) 36 { 37 struct stat st; 38 39 if (stat(path, &st)) 40 return false; 41 42 return S_ISDIR(st.st_mode); 43 } 44 45 /* return true if the given two files are the same, false otherwise */ 46 static bool is_same(const char *file1, const char *file2) 47 { 48 int fd1, fd2; 49 struct stat st1, st2; 50 void *map1, *map2; 51 bool ret = false; 52 53 fd1 = open(file1, O_RDONLY); 54 if (fd1 < 0) 55 return ret; 56 57 fd2 = open(file2, O_RDONLY); 58 if (fd2 < 0) 59 goto close1; 60 61 ret = fstat(fd1, &st1); 62 if (ret) 63 goto close2; 64 ret = fstat(fd2, &st2); 65 if (ret) 66 goto close2; 67 68 if (st1.st_size != st2.st_size) 69 goto close2; 70 71 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0); 72 if (map1 == MAP_FAILED) 73 goto close2; 74 75 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0); 76 if (map2 == MAP_FAILED) 77 goto close2; 78 79 if (bcmp(map1, map2, st1.st_size)) 80 goto close2; 81 82 ret = true; 83 close2: 84 close(fd2); 85 close1: 86 close(fd1); 87 88 return ret; 89 } 90 91 /* 92 * Create the parent directory of the given path. 93 * 94 * For example, if 'include/config/auto.conf' is given, create 'include/config'. 95 */ 96 static int make_parent_dir(const char *path) 97 { 98 char tmp[PATH_MAX + 1]; 99 char *p; 100 101 strncpy(tmp, path, sizeof(tmp)); 102 tmp[sizeof(tmp) - 1] = 0; 103 104 /* Remove the base name. Just return if nothing is left */ 105 p = strrchr(tmp, '/'); 106 if (!p) 107 return 0; 108 *(p + 1) = 0; 109 110 /* Just in case it is an absolute path */ 111 p = tmp; 112 while (*p == '/') 113 p++; 114 115 while ((p = strchr(p, '/'))) { 116 *p = 0; 117 118 /* skip if the directory exists */ 119 if (!is_dir(tmp) && mkdir(tmp, 0755)) 120 return -1; 121 122 *p = '/'; 123 while (*p == '/') 124 p++; 125 } 126 127 return 0; 128 } 129 130 static char depfile_path[PATH_MAX]; 131 static size_t depfile_prefix_len; 132 133 /* touch depfile for symbol 'name' */ 134 static int conf_touch_dep(const char *name) 135 { 136 int fd; 137 138 /* check overflow: prefix + name + '\0' must fit in buffer. */ 139 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path)) 140 return -1; 141 142 strcpy(depfile_path + depfile_prefix_len, name); 143 144 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644); 145 if (fd == -1) 146 return -1; 147 close(fd); 148 149 return 0; 150 } 151 152 static void conf_warning(const char *fmt, ...) 153 __attribute__ ((format (printf, 1, 2))); 154 155 static void conf_message(const char *fmt, ...) 156 __attribute__ ((format (printf, 1, 2))); 157 158 static const char *conf_filename; 159 static int conf_lineno, conf_warnings; 160 161 bool conf_errors(void) 162 { 163 if (conf_warnings) 164 return getenv("KCONFIG_WERROR"); 165 return false; 166 } 167 168 static void conf_warning(const char *fmt, ...) 169 { 170 va_list ap; 171 va_start(ap, fmt); 172 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno); 173 vfprintf(stderr, fmt, ap); 174 fprintf(stderr, "\n"); 175 va_end(ap); 176 conf_warnings++; 177 } 178 179 static void conf_default_message_callback(const char *s) 180 { 181 printf("#\n# "); 182 printf("%s", s); 183 printf("\n#\n"); 184 } 185 186 static void (*conf_message_callback)(const char *s) = 187 conf_default_message_callback; 188 void conf_set_message_callback(void (*fn)(const char *s)) 189 { 190 conf_message_callback = fn; 191 } 192 193 static void conf_message(const char *fmt, ...) 194 { 195 va_list ap; 196 char buf[4096]; 197 198 if (!conf_message_callback) 199 return; 200 201 va_start(ap, fmt); 202 203 vsnprintf(buf, sizeof(buf), fmt, ap); 204 conf_message_callback(buf); 205 va_end(ap); 206 } 207 208 const char *conf_get_configname(void) 209 { 210 char *name = getenv("KCONFIG_CONFIG"); 211 212 return name ? name : ".config"; 213 } 214 215 static const char *conf_get_autoconfig_name(void) 216 { 217 char *name = getenv("KCONFIG_AUTOCONFIG"); 218 219 return name ? name : "include/config/auto.conf"; 220 } 221 222 static const char *conf_get_autoheader_name(void) 223 { 224 char *name = getenv("KCONFIG_AUTOHEADER"); 225 226 return name ? name : "include/generated/autoconf.h"; 227 } 228 229 static const char *conf_get_rustccfg_name(void) 230 { 231 char *name = getenv("KCONFIG_RUSTCCFG"); 232 233 return name ? name : "include/generated/rustc_cfg"; 234 } 235 236 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p) 237 { 238 char *p2; 239 240 switch (sym->type) { 241 case S_TRISTATE: 242 if (p[0] == 'm') { 243 sym->def[def].tri = mod; 244 sym->flags |= def_flags; 245 break; 246 } 247 /* fall through */ 248 case S_BOOLEAN: 249 if (p[0] == 'y') { 250 sym->def[def].tri = yes; 251 sym->flags |= def_flags; 252 break; 253 } 254 if (p[0] == 'n') { 255 sym->def[def].tri = no; 256 sym->flags |= def_flags; 257 break; 258 } 259 if (def != S_DEF_AUTO) 260 conf_warning("symbol value '%s' invalid for %s", 261 p, sym->name); 262 return 1; 263 case S_STRING: 264 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */ 265 if (def != S_DEF_AUTO) { 266 if (*p++ != '"') 267 break; 268 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) { 269 if (*p2 == '"') { 270 *p2 = 0; 271 break; 272 } 273 memmove(p2, p2 + 1, strlen(p2)); 274 } 275 if (!p2) { 276 conf_warning("invalid string found"); 277 return 1; 278 } 279 } 280 /* fall through */ 281 case S_INT: 282 case S_HEX: 283 if (sym_string_valid(sym, p)) { 284 sym->def[def].val = xstrdup(p); 285 sym->flags |= def_flags; 286 } else { 287 if (def != S_DEF_AUTO) 288 conf_warning("symbol value '%s' invalid for %s", 289 p, sym->name); 290 return 1; 291 } 292 break; 293 default: 294 ; 295 } 296 return 0; 297 } 298 299 /* like getline(), but the newline character is stripped away */ 300 static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream) 301 { 302 ssize_t len; 303 304 len = getline(lineptr, n, stream); 305 306 if (len > 0 && (*lineptr)[len - 1] == '\n') { 307 len--; 308 (*lineptr)[len] = '\0'; 309 310 if (len > 0 && (*lineptr)[len - 1] == '\r') { 311 len--; 312 (*lineptr)[len] = '\0'; 313 } 314 } 315 316 return len; 317 } 318 319 int conf_read_simple(const char *name, int def) 320 { 321 FILE *in = NULL; 322 char *line = NULL; 323 size_t line_asize = 0; 324 char *p, *val; 325 struct symbol *sym; 326 int def_flags; 327 const char *warn_unknown, *sym_name; 328 329 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS"); 330 if (name) { 331 in = zconf_fopen(name); 332 } else { 333 char *env; 334 335 name = conf_get_configname(); 336 in = zconf_fopen(name); 337 if (in) 338 goto load; 339 conf_set_changed(true); 340 341 env = getenv("KCONFIG_DEFCONFIG_LIST"); 342 if (!env) 343 return 1; 344 345 while (1) { 346 bool is_last; 347 348 while (isspace(*env)) 349 env++; 350 351 if (!*env) 352 break; 353 354 p = env; 355 while (*p && !isspace(*p)) 356 p++; 357 358 is_last = (*p == '\0'); 359 360 *p = '\0'; 361 362 in = zconf_fopen(env); 363 if (in) { 364 conf_message("using defaults found in %s", 365 env); 366 goto load; 367 } 368 369 if (is_last) 370 break; 371 372 env = p + 1; 373 } 374 } 375 if (!in) 376 return 1; 377 378 load: 379 conf_filename = name; 380 conf_lineno = 0; 381 conf_warnings = 0; 382 383 def_flags = SYMBOL_DEF << def; 384 for_all_symbols(sym) { 385 sym->flags &= ~(def_flags|SYMBOL_VALID); 386 switch (sym->type) { 387 case S_INT: 388 case S_HEX: 389 case S_STRING: 390 free(sym->def[def].val); 391 /* fall through */ 392 default: 393 sym->def[def].val = NULL; 394 sym->def[def].tri = no; 395 } 396 } 397 398 while (getline_stripped(&line, &line_asize, in) != -1) { 399 struct menu *choice; 400 401 conf_lineno++; 402 403 if (!line[0]) /* blank line */ 404 continue; 405 406 if (line[0] == '#') { 407 if (line[1] != ' ') 408 continue; 409 p = line + 2; 410 if (memcmp(p, CONFIG_, strlen(CONFIG_))) 411 continue; 412 sym_name = p + strlen(CONFIG_); 413 p = strchr(sym_name, ' '); 414 if (!p) 415 continue; 416 *p++ = 0; 417 if (strcmp(p, "is not set")) 418 continue; 419 420 val = "n"; 421 } else { 422 if (memcmp(line, CONFIG_, strlen(CONFIG_))) { 423 conf_warning("unexpected data: %s", line); 424 continue; 425 } 426 427 sym_name = line + strlen(CONFIG_); 428 p = strchr(sym_name, '='); 429 if (!p) { 430 conf_warning("unexpected data: %s", line); 431 continue; 432 } 433 *p = 0; 434 val = p + 1; 435 } 436 437 sym = sym_find(sym_name); 438 if (!sym) { 439 if (def == S_DEF_AUTO) { 440 /* 441 * Reading from include/config/auto.conf. 442 * If CONFIG_FOO previously existed in auto.conf 443 * but it is missing now, include/config/FOO 444 * must be touched. 445 */ 446 conf_touch_dep(sym_name); 447 } else { 448 if (warn_unknown) 449 conf_warning("unknown symbol: %s", sym_name); 450 451 conf_set_changed(true); 452 } 453 continue; 454 } 455 456 if (sym->flags & def_flags) 457 conf_warning("override: reassigning to symbol %s", sym->name); 458 459 if (conf_set_sym_val(sym, def, def_flags, val)) 460 continue; 461 462 /* 463 * If this is a choice member, give it the highest priority. 464 * If conflicting CONFIG options are given from an input file, 465 * the last one wins. 466 */ 467 choice = sym_get_choice_menu(sym); 468 if (choice) 469 list_move(&sym->choice_link, &choice->choice_members); 470 } 471 free(line); 472 fclose(in); 473 474 return 0; 475 } 476 477 int conf_read(const char *name) 478 { 479 struct symbol *sym; 480 481 conf_set_changed(false); 482 483 if (conf_read_simple(name, S_DEF_USER)) { 484 sym_calc_value(modules_sym); 485 return 1; 486 } 487 488 sym_calc_value(modules_sym); 489 490 for_all_symbols(sym) { 491 sym_calc_value(sym); 492 if (sym_is_choice(sym)) 493 continue; 494 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) { 495 /* check that calculated value agrees with saved value */ 496 switch (sym->type) { 497 case S_BOOLEAN: 498 case S_TRISTATE: 499 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym)) 500 continue; 501 break; 502 default: 503 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val)) 504 continue; 505 break; 506 } 507 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE)) 508 /* no previous value and not saved */ 509 continue; 510 conf_set_changed(true); 511 /* maybe print value in verbose mode... */ 512 } 513 514 if (conf_warnings) 515 conf_set_changed(true); 516 517 return 0; 518 } 519 520 struct comment_style { 521 const char *decoration; 522 const char *prefix; 523 const char *postfix; 524 }; 525 526 static const struct comment_style comment_style_pound = { 527 .decoration = "#", 528 .prefix = "#", 529 .postfix = "#", 530 }; 531 532 static const struct comment_style comment_style_c = { 533 .decoration = " *", 534 .prefix = "/*", 535 .postfix = " */", 536 }; 537 538 static void conf_write_heading(FILE *fp, const struct comment_style *cs) 539 { 540 if (!cs) 541 return; 542 543 fprintf(fp, "%s\n", cs->prefix); 544 545 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n", 546 cs->decoration); 547 548 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text); 549 550 fprintf(fp, "%s\n", cs->postfix); 551 } 552 553 /* The returned pointer must be freed on the caller side */ 554 static char *escape_string_value(const char *in) 555 { 556 const char *p; 557 char *out; 558 size_t len; 559 560 len = strlen(in) + strlen("\"\"") + 1; 561 562 p = in; 563 while (1) { 564 p += strcspn(p, "\"\\"); 565 566 if (p[0] == '\0') 567 break; 568 569 len++; 570 p++; 571 } 572 573 out = xmalloc(len); 574 out[0] = '\0'; 575 576 strcat(out, "\""); 577 578 p = in; 579 while (1) { 580 len = strcspn(p, "\"\\"); 581 strncat(out, p, len); 582 p += len; 583 584 if (p[0] == '\0') 585 break; 586 587 strcat(out, "\\"); 588 strncat(out, p++, 1); 589 } 590 591 strcat(out, "\""); 592 593 return out; 594 } 595 596 enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE }; 597 598 static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n, 599 bool escape_string) 600 { 601 const char *val; 602 char *escaped = NULL; 603 604 if (sym->type == S_UNKNOWN) 605 return; 606 607 val = sym_get_string_value(sym); 608 609 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) && 610 output_n != OUTPUT_N && *val == 'n') { 611 if (output_n == OUTPUT_N_AS_UNSET) 612 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name); 613 return; 614 } 615 616 if (sym->type == S_STRING && escape_string) { 617 escaped = escape_string_value(val); 618 val = escaped; 619 } 620 621 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val); 622 623 free(escaped); 624 } 625 626 static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym) 627 { 628 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true); 629 } 630 631 static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym) 632 { 633 __print_symbol(fp, sym, OUTPUT_N_NONE, false); 634 } 635 636 void print_symbol_for_listconfig(struct symbol *sym) 637 { 638 __print_symbol(stdout, sym, OUTPUT_N, true); 639 } 640 641 static void print_symbol_for_c(FILE *fp, struct symbol *sym) 642 { 643 const char *val; 644 const char *sym_suffix = ""; 645 const char *val_prefix = ""; 646 char *escaped = NULL; 647 648 if (sym->type == S_UNKNOWN) 649 return; 650 651 val = sym_get_string_value(sym); 652 653 switch (sym->type) { 654 case S_BOOLEAN: 655 case S_TRISTATE: 656 switch (*val) { 657 case 'n': 658 return; 659 case 'm': 660 sym_suffix = "_MODULE"; 661 /* fall through */ 662 default: 663 val = "1"; 664 } 665 break; 666 case S_HEX: 667 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) 668 val_prefix = "0x"; 669 break; 670 case S_STRING: 671 escaped = escape_string_value(val); 672 val = escaped; 673 default: 674 break; 675 } 676 677 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix, 678 val_prefix, val); 679 680 free(escaped); 681 } 682 683 static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym) 684 { 685 const char *val; 686 const char *val_prefix = ""; 687 char *val_prefixed = NULL; 688 size_t val_prefixed_len; 689 char *escaped = NULL; 690 691 if (sym->type == S_UNKNOWN) 692 return; 693 694 val = sym_get_string_value(sym); 695 696 switch (sym->type) { 697 case S_BOOLEAN: 698 case S_TRISTATE: 699 /* 700 * We do not care about disabled ones, i.e. no need for 701 * what otherwise are "comments" in other printers. 702 */ 703 if (*val == 'n') 704 return; 705 706 /* 707 * To have similar functionality to the C macro `IS_ENABLED()` 708 * we provide an empty `--cfg CONFIG_X` here in both `y` 709 * and `m` cases. 710 * 711 * Then, the common `fprintf()` below will also give us 712 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can 713 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`. 714 */ 715 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name); 716 break; 717 case S_HEX: 718 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) 719 val_prefix = "0x"; 720 break; 721 default: 722 break; 723 } 724 725 if (strlen(val_prefix) > 0) { 726 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1; 727 val_prefixed = xmalloc(val_prefixed_len); 728 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val); 729 val = val_prefixed; 730 } 731 732 /* All values get escaped: the `--cfg` option only takes strings */ 733 escaped = escape_string_value(val); 734 val = escaped; 735 736 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val); 737 738 free(escaped); 739 free(val_prefixed); 740 } 741 742 /* 743 * Write out a minimal config. 744 * All values that has default values are skipped as this is redundant. 745 */ 746 int conf_write_defconfig(const char *filename) 747 { 748 struct symbol *sym; 749 struct menu *menu; 750 FILE *out; 751 752 out = fopen(filename, "w"); 753 if (!out) 754 return 1; 755 756 sym_clear_all_valid(); 757 758 menu_for_each_entry(menu) { 759 struct menu *choice; 760 761 sym = menu->sym; 762 763 if (!sym || sym_is_choice(sym)) 764 continue; 765 766 sym_calc_value(sym); 767 if (!(sym->flags & SYMBOL_WRITE)) 768 continue; 769 sym->flags &= ~SYMBOL_WRITE; 770 /* Skip unchangeable symbols */ 771 if (!sym_is_changeable(sym)) 772 continue; 773 /* Skip symbols that are equal to the default */ 774 if (!strcmp(sym_get_string_value(sym), sym_get_string_default(sym))) 775 continue; 776 777 /* Skip choice values that are equal to the default */ 778 choice = sym_get_choice_menu(sym); 779 if (choice) { 780 struct symbol *ds; 781 782 ds = sym_choice_default(choice); 783 if (sym == ds && sym_get_tristate_value(sym) == yes) 784 continue; 785 } 786 print_symbol_for_dotconfig(out, sym); 787 } 788 fclose(out); 789 return 0; 790 } 791 792 int conf_write(const char *name) 793 { 794 FILE *out; 795 struct symbol *sym; 796 struct menu *menu; 797 const char *str; 798 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1]; 799 char *env; 800 bool need_newline = false; 801 802 if (!name) 803 name = conf_get_configname(); 804 805 if (!*name) { 806 fprintf(stderr, "config name is empty\n"); 807 return -1; 808 } 809 810 if (is_dir(name)) { 811 fprintf(stderr, "%s: Is a directory\n", name); 812 return -1; 813 } 814 815 if (make_parent_dir(name)) 816 return -1; 817 818 env = getenv("KCONFIG_OVERWRITECONFIG"); 819 if (env && *env) { 820 *tmpname = 0; 821 out = fopen(name, "w"); 822 } else { 823 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp", 824 name, (int)getpid()); 825 out = fopen(tmpname, "w"); 826 } 827 if (!out) 828 return 1; 829 830 conf_write_heading(out, &comment_style_pound); 831 832 if (!conf_get_changed()) 833 sym_clear_all_valid(); 834 835 menu = rootmenu.list; 836 while (menu) { 837 sym = menu->sym; 838 if (!sym) { 839 if (!menu_is_visible(menu)) 840 goto next; 841 str = menu_get_prompt(menu); 842 fprintf(out, "\n" 843 "#\n" 844 "# %s\n" 845 "#\n", str); 846 need_newline = false; 847 } else if (!sym_is_choice(sym) && 848 !(sym->flags & SYMBOL_WRITTEN)) { 849 sym_calc_value(sym); 850 if (!(sym->flags & SYMBOL_WRITE)) 851 goto next; 852 if (need_newline) { 853 fprintf(out, "\n"); 854 need_newline = false; 855 } 856 sym->flags |= SYMBOL_WRITTEN; 857 print_symbol_for_dotconfig(out, sym); 858 } 859 860 next: 861 if (menu->list) { 862 menu = menu->list; 863 continue; 864 } 865 866 end_check: 867 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu && 868 menu->prompt->type == P_MENU) { 869 fprintf(out, "# end of %s\n", menu_get_prompt(menu)); 870 need_newline = true; 871 } 872 873 if (menu->next) { 874 menu = menu->next; 875 } else { 876 menu = menu->parent; 877 if (menu) 878 goto end_check; 879 } 880 } 881 fclose(out); 882 883 for_all_symbols(sym) 884 sym->flags &= ~SYMBOL_WRITTEN; 885 886 if (*tmpname) { 887 if (is_same(name, tmpname)) { 888 conf_message("No change to %s", name); 889 unlink(tmpname); 890 conf_set_changed(false); 891 return 0; 892 } 893 894 snprintf(oldname, sizeof(oldname), "%s.old", name); 895 rename(name, oldname); 896 if (rename(tmpname, name)) 897 return 1; 898 } 899 900 conf_message("configuration written to %s", name); 901 902 conf_set_changed(false); 903 904 return 0; 905 } 906 907 /* write a dependency file as used by kbuild to track dependencies */ 908 static int conf_write_autoconf_cmd(const char *autoconf_name) 909 { 910 char name[PATH_MAX], tmp[PATH_MAX]; 911 FILE *out; 912 int ret; 913 914 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name); 915 if (ret >= sizeof(name)) /* check truncation */ 916 return -1; 917 918 if (make_parent_dir(name)) 919 return -1; 920 921 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name); 922 if (ret >= sizeof(tmp)) /* check truncation */ 923 return -1; 924 925 out = fopen(tmp, "w"); 926 if (!out) { 927 perror("fopen"); 928 return -1; 929 } 930 931 fprintf(out, "autoconfig := %s\n", autoconf_name); 932 933 fputs(str_get(&autoconf_cmd), out); 934 935 fflush(out); 936 ret = ferror(out); /* error check for all fprintf() calls */ 937 fclose(out); 938 if (ret) 939 return -1; 940 941 if (rename(tmp, name)) { 942 perror("rename"); 943 return -1; 944 } 945 946 return 0; 947 } 948 949 static int conf_touch_deps(void) 950 { 951 const char *name, *tmp; 952 struct symbol *sym; 953 int res; 954 955 name = conf_get_autoconfig_name(); 956 tmp = strrchr(name, '/'); 957 depfile_prefix_len = tmp ? tmp - name + 1 : 0; 958 if (depfile_prefix_len + 1 > sizeof(depfile_path)) 959 return -1; 960 961 strncpy(depfile_path, name, depfile_prefix_len); 962 depfile_path[depfile_prefix_len] = 0; 963 964 conf_read_simple(name, S_DEF_AUTO); 965 sym_calc_value(modules_sym); 966 967 for_all_symbols(sym) { 968 sym_calc_value(sym); 969 if (sym_is_choice(sym)) 970 continue; 971 if (sym->flags & SYMBOL_WRITE) { 972 if (sym->flags & SYMBOL_DEF_AUTO) { 973 /* 974 * symbol has old and new value, 975 * so compare them... 976 */ 977 switch (sym->type) { 978 case S_BOOLEAN: 979 case S_TRISTATE: 980 if (sym_get_tristate_value(sym) == 981 sym->def[S_DEF_AUTO].tri) 982 continue; 983 break; 984 case S_STRING: 985 case S_HEX: 986 case S_INT: 987 if (!strcmp(sym_get_string_value(sym), 988 sym->def[S_DEF_AUTO].val)) 989 continue; 990 break; 991 default: 992 break; 993 } 994 } else { 995 /* 996 * If there is no old value, only 'no' (unset) 997 * is allowed as new value. 998 */ 999 switch (sym->type) { 1000 case S_BOOLEAN: 1001 case S_TRISTATE: 1002 if (sym_get_tristate_value(sym) == no) 1003 continue; 1004 break; 1005 default: 1006 break; 1007 } 1008 } 1009 } else if (!(sym->flags & SYMBOL_DEF_AUTO)) 1010 /* There is neither an old nor a new value. */ 1011 continue; 1012 /* else 1013 * There is an old value, but no new value ('no' (unset) 1014 * isn't saved in auto.conf, so the old value is always 1015 * different from 'no'). 1016 */ 1017 1018 res = conf_touch_dep(sym->name); 1019 if (res) 1020 return res; 1021 } 1022 1023 return 0; 1024 } 1025 1026 static int __conf_write_autoconf(const char *filename, 1027 void (*print_symbol)(FILE *, struct symbol *), 1028 const struct comment_style *comment_style) 1029 { 1030 char tmp[PATH_MAX]; 1031 FILE *file; 1032 struct symbol *sym; 1033 int ret; 1034 1035 if (make_parent_dir(filename)) 1036 return -1; 1037 1038 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename); 1039 if (ret >= sizeof(tmp)) /* check truncation */ 1040 return -1; 1041 1042 file = fopen(tmp, "w"); 1043 if (!file) { 1044 perror("fopen"); 1045 return -1; 1046 } 1047 1048 conf_write_heading(file, comment_style); 1049 1050 for_all_symbols(sym) 1051 if ((sym->flags & SYMBOL_WRITE) && sym->name) 1052 print_symbol(file, sym); 1053 1054 fflush(file); 1055 /* check possible errors in conf_write_heading() and print_symbol() */ 1056 ret = ferror(file); 1057 fclose(file); 1058 if (ret) 1059 return -1; 1060 1061 if (rename(tmp, filename)) { 1062 perror("rename"); 1063 return -1; 1064 } 1065 1066 return 0; 1067 } 1068 1069 int conf_write_autoconf(int overwrite) 1070 { 1071 struct symbol *sym; 1072 const char *autoconf_name = conf_get_autoconfig_name(); 1073 int ret; 1074 1075 if (!overwrite && is_present(autoconf_name)) 1076 return 0; 1077 1078 ret = conf_write_autoconf_cmd(autoconf_name); 1079 if (ret) 1080 return -1; 1081 1082 if (conf_touch_deps()) 1083 return 1; 1084 1085 for_all_symbols(sym) 1086 sym_calc_value(sym); 1087 1088 ret = __conf_write_autoconf(conf_get_autoheader_name(), 1089 print_symbol_for_c, 1090 &comment_style_c); 1091 if (ret) 1092 return ret; 1093 1094 ret = __conf_write_autoconf(conf_get_rustccfg_name(), 1095 print_symbol_for_rustccfg, 1096 NULL); 1097 if (ret) 1098 return ret; 1099 1100 /* 1101 * Create include/config/auto.conf. This must be the last step because 1102 * Kbuild has a dependency on auto.conf and this marks the successful 1103 * completion of the previous steps. 1104 */ 1105 ret = __conf_write_autoconf(conf_get_autoconfig_name(), 1106 print_symbol_for_autoconf, 1107 &comment_style_pound); 1108 if (ret) 1109 return ret; 1110 1111 return 0; 1112 } 1113 1114 static bool conf_changed; 1115 static void (*conf_changed_callback)(bool); 1116 1117 void conf_set_changed(bool val) 1118 { 1119 if (conf_changed_callback && conf_changed != val) 1120 conf_changed_callback(val); 1121 1122 conf_changed = val; 1123 } 1124 1125 bool conf_get_changed(void) 1126 { 1127 return conf_changed; 1128 } 1129 1130 void conf_set_changed_callback(void (*fn)(bool)) 1131 { 1132 conf_changed_callback = fn; 1133 } 1134