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 |= SYMBOL_CHANGED; 386 sym->flags &= ~(def_flags|SYMBOL_VALID); 387 if (sym_is_choice(sym)) 388 sym->flags |= def_flags; 389 switch (sym->type) { 390 case S_INT: 391 case S_HEX: 392 case S_STRING: 393 free(sym->def[def].val); 394 /* fall through */ 395 default: 396 sym->def[def].val = NULL; 397 sym->def[def].tri = no; 398 } 399 } 400 401 while (getline_stripped(&line, &line_asize, in) != -1) { 402 conf_lineno++; 403 404 if (!line[0]) /* blank line */ 405 continue; 406 407 if (line[0] == '#') { 408 if (line[1] != ' ') 409 continue; 410 p = line + 2; 411 if (memcmp(p, CONFIG_, strlen(CONFIG_))) 412 continue; 413 sym_name = p + strlen(CONFIG_); 414 p = strchr(sym_name, ' '); 415 if (!p) 416 continue; 417 *p++ = 0; 418 if (strcmp(p, "is not set")) 419 continue; 420 421 val = "n"; 422 } else { 423 if (memcmp(line, CONFIG_, strlen(CONFIG_))) { 424 conf_warning("unexpected data: %s", line); 425 continue; 426 } 427 428 sym_name = line + strlen(CONFIG_); 429 p = strchr(sym_name, '='); 430 if (!p) { 431 conf_warning("unexpected data: %s", line); 432 continue; 433 } 434 *p = 0; 435 val = p + 1; 436 } 437 438 sym = sym_find(sym_name); 439 if (!sym) { 440 if (def == S_DEF_AUTO) { 441 /* 442 * Reading from include/config/auto.conf. 443 * If CONFIG_FOO previously existed in auto.conf 444 * but it is missing now, include/config/FOO 445 * must be touched. 446 */ 447 conf_touch_dep(sym_name); 448 } else { 449 if (warn_unknown) 450 conf_warning("unknown symbol: %s", sym_name); 451 452 conf_set_changed(true); 453 } 454 continue; 455 } 456 457 if (sym->flags & def_flags) 458 conf_warning("override: reassigning to symbol %s", sym->name); 459 460 if (conf_set_sym_val(sym, def, def_flags, val)) 461 continue; 462 463 if (sym && sym_is_choice_value(sym)) { 464 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym)); 465 switch (sym->def[def].tri) { 466 case no: 467 break; 468 case mod: 469 if (cs->def[def].tri == yes) { 470 conf_warning("%s creates inconsistent choice state", sym->name); 471 cs->flags &= ~def_flags; 472 } 473 break; 474 case yes: 475 if (cs->def[def].tri != no) 476 conf_warning("override: %s changes choice state", sym->name); 477 cs->def[def].val = sym; 478 break; 479 } 480 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri); 481 } 482 } 483 free(line); 484 fclose(in); 485 486 return 0; 487 } 488 489 int conf_read(const char *name) 490 { 491 struct symbol *sym; 492 int conf_unsaved = 0; 493 494 conf_set_changed(false); 495 496 if (conf_read_simple(name, S_DEF_USER)) { 497 sym_calc_value(modules_sym); 498 return 1; 499 } 500 501 sym_calc_value(modules_sym); 502 503 for_all_symbols(sym) { 504 sym_calc_value(sym); 505 if (sym_is_choice(sym)) 506 continue; 507 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) { 508 /* check that calculated value agrees with saved value */ 509 switch (sym->type) { 510 case S_BOOLEAN: 511 case S_TRISTATE: 512 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym)) 513 continue; 514 break; 515 default: 516 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val)) 517 continue; 518 break; 519 } 520 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE)) 521 /* no previous value and not saved */ 522 continue; 523 conf_unsaved++; 524 /* maybe print value in verbose mode... */ 525 } 526 527 for_all_symbols(sym) { 528 if (sym_has_value(sym) && !sym_is_choice_value(sym)) { 529 /* Reset values of generates values, so they'll appear 530 * as new, if they should become visible, but that 531 * doesn't quite work if the Kconfig and the saved 532 * configuration disagree. 533 */ 534 if (sym->visible == no && !conf_unsaved) 535 sym->flags &= ~SYMBOL_DEF_USER; 536 } 537 } 538 539 if (conf_warnings || conf_unsaved) 540 conf_set_changed(true); 541 542 return 0; 543 } 544 545 struct comment_style { 546 const char *decoration; 547 const char *prefix; 548 const char *postfix; 549 }; 550 551 static const struct comment_style comment_style_pound = { 552 .decoration = "#", 553 .prefix = "#", 554 .postfix = "#", 555 }; 556 557 static const struct comment_style comment_style_c = { 558 .decoration = " *", 559 .prefix = "/*", 560 .postfix = " */", 561 }; 562 563 static void conf_write_heading(FILE *fp, const struct comment_style *cs) 564 { 565 if (!cs) 566 return; 567 568 fprintf(fp, "%s\n", cs->prefix); 569 570 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n", 571 cs->decoration); 572 573 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text); 574 575 fprintf(fp, "%s\n", cs->postfix); 576 } 577 578 /* The returned pointer must be freed on the caller side */ 579 static char *escape_string_value(const char *in) 580 { 581 const char *p; 582 char *out; 583 size_t len; 584 585 len = strlen(in) + strlen("\"\"") + 1; 586 587 p = in; 588 while (1) { 589 p += strcspn(p, "\"\\"); 590 591 if (p[0] == '\0') 592 break; 593 594 len++; 595 p++; 596 } 597 598 out = xmalloc(len); 599 out[0] = '\0'; 600 601 strcat(out, "\""); 602 603 p = in; 604 while (1) { 605 len = strcspn(p, "\"\\"); 606 strncat(out, p, len); 607 p += len; 608 609 if (p[0] == '\0') 610 break; 611 612 strcat(out, "\\"); 613 strncat(out, p++, 1); 614 } 615 616 strcat(out, "\""); 617 618 return out; 619 } 620 621 enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE }; 622 623 static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n, 624 bool escape_string) 625 { 626 const char *val; 627 char *escaped = NULL; 628 629 if (sym->type == S_UNKNOWN) 630 return; 631 632 val = sym_get_string_value(sym); 633 634 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) && 635 output_n != OUTPUT_N && *val == 'n') { 636 if (output_n == OUTPUT_N_AS_UNSET) 637 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name); 638 return; 639 } 640 641 if (sym->type == S_STRING && escape_string) { 642 escaped = escape_string_value(val); 643 val = escaped; 644 } 645 646 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val); 647 648 free(escaped); 649 } 650 651 static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym) 652 { 653 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true); 654 } 655 656 static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym) 657 { 658 __print_symbol(fp, sym, OUTPUT_N_NONE, false); 659 } 660 661 void print_symbol_for_listconfig(struct symbol *sym) 662 { 663 __print_symbol(stdout, sym, OUTPUT_N, true); 664 } 665 666 static void print_symbol_for_c(FILE *fp, struct symbol *sym) 667 { 668 const char *val; 669 const char *sym_suffix = ""; 670 const char *val_prefix = ""; 671 char *escaped = NULL; 672 673 if (sym->type == S_UNKNOWN) 674 return; 675 676 val = sym_get_string_value(sym); 677 678 switch (sym->type) { 679 case S_BOOLEAN: 680 case S_TRISTATE: 681 switch (*val) { 682 case 'n': 683 return; 684 case 'm': 685 sym_suffix = "_MODULE"; 686 /* fall through */ 687 default: 688 val = "1"; 689 } 690 break; 691 case S_HEX: 692 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) 693 val_prefix = "0x"; 694 break; 695 case S_STRING: 696 escaped = escape_string_value(val); 697 val = escaped; 698 default: 699 break; 700 } 701 702 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix, 703 val_prefix, val); 704 705 free(escaped); 706 } 707 708 static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym) 709 { 710 const char *val; 711 const char *val_prefix = ""; 712 char *val_prefixed = NULL; 713 size_t val_prefixed_len; 714 char *escaped = NULL; 715 716 if (sym->type == S_UNKNOWN) 717 return; 718 719 val = sym_get_string_value(sym); 720 721 switch (sym->type) { 722 case S_BOOLEAN: 723 case S_TRISTATE: 724 /* 725 * We do not care about disabled ones, i.e. no need for 726 * what otherwise are "comments" in other printers. 727 */ 728 if (*val == 'n') 729 return; 730 731 /* 732 * To have similar functionality to the C macro `IS_ENABLED()` 733 * we provide an empty `--cfg CONFIG_X` here in both `y` 734 * and `m` cases. 735 * 736 * Then, the common `fprintf()` below will also give us 737 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can 738 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`. 739 */ 740 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name); 741 break; 742 case S_HEX: 743 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) 744 val_prefix = "0x"; 745 break; 746 default: 747 break; 748 } 749 750 if (strlen(val_prefix) > 0) { 751 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1; 752 val_prefixed = xmalloc(val_prefixed_len); 753 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val); 754 val = val_prefixed; 755 } 756 757 /* All values get escaped: the `--cfg` option only takes strings */ 758 escaped = escape_string_value(val); 759 val = escaped; 760 761 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val); 762 763 free(escaped); 764 free(val_prefixed); 765 } 766 767 /* 768 * Write out a minimal config. 769 * All values that has default values are skipped as this is redundant. 770 */ 771 int conf_write_defconfig(const char *filename) 772 { 773 struct symbol *sym; 774 struct menu *menu; 775 FILE *out; 776 777 out = fopen(filename, "w"); 778 if (!out) 779 return 1; 780 781 sym_clear_all_valid(); 782 783 menu_for_each_entry(menu) { 784 struct menu *choice; 785 786 sym = menu->sym; 787 if (sym && !sym_is_choice(sym)) { 788 sym_calc_value(sym); 789 if (!(sym->flags & SYMBOL_WRITE)) 790 continue; 791 sym->flags &= ~SYMBOL_WRITE; 792 /* If we cannot change the symbol - skip */ 793 if (!sym_is_changeable(sym)) 794 continue; 795 /* If symbol equals to default value - skip */ 796 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0) 797 continue; 798 799 /* 800 * If symbol is a choice value and equals to the 801 * default for a choice - skip. 802 */ 803 choice = sym_get_choice_menu(sym); 804 if (choice) { 805 struct symbol *ds; 806 807 ds = sym_choice_default(choice->sym); 808 if (sym == ds) { 809 if ((sym->type == S_BOOLEAN) && 810 sym_get_tristate_value(sym) == yes) 811 continue; 812 } 813 } 814 print_symbol_for_dotconfig(out, sym); 815 } 816 } 817 fclose(out); 818 return 0; 819 } 820 821 int conf_write(const char *name) 822 { 823 FILE *out; 824 struct symbol *sym; 825 struct menu *menu; 826 const char *str; 827 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1]; 828 char *env; 829 bool need_newline = false; 830 831 if (!name) 832 name = conf_get_configname(); 833 834 if (!*name) { 835 fprintf(stderr, "config name is empty\n"); 836 return -1; 837 } 838 839 if (is_dir(name)) { 840 fprintf(stderr, "%s: Is a directory\n", name); 841 return -1; 842 } 843 844 if (make_parent_dir(name)) 845 return -1; 846 847 env = getenv("KCONFIG_OVERWRITECONFIG"); 848 if (env && *env) { 849 *tmpname = 0; 850 out = fopen(name, "w"); 851 } else { 852 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp", 853 name, (int)getpid()); 854 out = fopen(tmpname, "w"); 855 } 856 if (!out) 857 return 1; 858 859 conf_write_heading(out, &comment_style_pound); 860 861 if (!conf_get_changed()) 862 sym_clear_all_valid(); 863 864 menu = rootmenu.list; 865 while (menu) { 866 sym = menu->sym; 867 if (!sym) { 868 if (!menu_is_visible(menu)) 869 goto next; 870 str = menu_get_prompt(menu); 871 fprintf(out, "\n" 872 "#\n" 873 "# %s\n" 874 "#\n", str); 875 need_newline = false; 876 } else if (!sym_is_choice(sym) && 877 !(sym->flags & SYMBOL_WRITTEN)) { 878 sym_calc_value(sym); 879 if (!(sym->flags & SYMBOL_WRITE)) 880 goto next; 881 if (need_newline) { 882 fprintf(out, "\n"); 883 need_newline = false; 884 } 885 sym->flags |= SYMBOL_WRITTEN; 886 print_symbol_for_dotconfig(out, sym); 887 } 888 889 next: 890 if (menu->list) { 891 menu = menu->list; 892 continue; 893 } 894 895 end_check: 896 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu && 897 menu->prompt->type == P_MENU) { 898 fprintf(out, "# end of %s\n", menu_get_prompt(menu)); 899 need_newline = true; 900 } 901 902 if (menu->next) { 903 menu = menu->next; 904 } else { 905 menu = menu->parent; 906 if (menu) 907 goto end_check; 908 } 909 } 910 fclose(out); 911 912 for_all_symbols(sym) 913 sym->flags &= ~SYMBOL_WRITTEN; 914 915 if (*tmpname) { 916 if (is_same(name, tmpname)) { 917 conf_message("No change to %s", name); 918 unlink(tmpname); 919 conf_set_changed(false); 920 return 0; 921 } 922 923 snprintf(oldname, sizeof(oldname), "%s.old", name); 924 rename(name, oldname); 925 if (rename(tmpname, name)) 926 return 1; 927 } 928 929 conf_message("configuration written to %s", name); 930 931 conf_set_changed(false); 932 933 return 0; 934 } 935 936 /* write a dependency file as used by kbuild to track dependencies */ 937 static int conf_write_autoconf_cmd(const char *autoconf_name) 938 { 939 char name[PATH_MAX], tmp[PATH_MAX]; 940 FILE *out; 941 int ret; 942 943 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name); 944 if (ret >= sizeof(name)) /* check truncation */ 945 return -1; 946 947 if (make_parent_dir(name)) 948 return -1; 949 950 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name); 951 if (ret >= sizeof(tmp)) /* check truncation */ 952 return -1; 953 954 out = fopen(tmp, "w"); 955 if (!out) { 956 perror("fopen"); 957 return -1; 958 } 959 960 fprintf(out, "autoconfig := %s\n", autoconf_name); 961 962 fputs(str_get(&autoconf_cmd), out); 963 964 fflush(out); 965 ret = ferror(out); /* error check for all fprintf() calls */ 966 fclose(out); 967 if (ret) 968 return -1; 969 970 if (rename(tmp, name)) { 971 perror("rename"); 972 return -1; 973 } 974 975 return 0; 976 } 977 978 static int conf_touch_deps(void) 979 { 980 const char *name, *tmp; 981 struct symbol *sym; 982 int res; 983 984 name = conf_get_autoconfig_name(); 985 tmp = strrchr(name, '/'); 986 depfile_prefix_len = tmp ? tmp - name + 1 : 0; 987 if (depfile_prefix_len + 1 > sizeof(depfile_path)) 988 return -1; 989 990 strncpy(depfile_path, name, depfile_prefix_len); 991 depfile_path[depfile_prefix_len] = 0; 992 993 conf_read_simple(name, S_DEF_AUTO); 994 sym_calc_value(modules_sym); 995 996 for_all_symbols(sym) { 997 sym_calc_value(sym); 998 if (sym_is_choice(sym)) 999 continue; 1000 if (sym->flags & SYMBOL_WRITE) { 1001 if (sym->flags & SYMBOL_DEF_AUTO) { 1002 /* 1003 * symbol has old and new value, 1004 * so compare them... 1005 */ 1006 switch (sym->type) { 1007 case S_BOOLEAN: 1008 case S_TRISTATE: 1009 if (sym_get_tristate_value(sym) == 1010 sym->def[S_DEF_AUTO].tri) 1011 continue; 1012 break; 1013 case S_STRING: 1014 case S_HEX: 1015 case S_INT: 1016 if (!strcmp(sym_get_string_value(sym), 1017 sym->def[S_DEF_AUTO].val)) 1018 continue; 1019 break; 1020 default: 1021 break; 1022 } 1023 } else { 1024 /* 1025 * If there is no old value, only 'no' (unset) 1026 * is allowed as new value. 1027 */ 1028 switch (sym->type) { 1029 case S_BOOLEAN: 1030 case S_TRISTATE: 1031 if (sym_get_tristate_value(sym) == no) 1032 continue; 1033 break; 1034 default: 1035 break; 1036 } 1037 } 1038 } else if (!(sym->flags & SYMBOL_DEF_AUTO)) 1039 /* There is neither an old nor a new value. */ 1040 continue; 1041 /* else 1042 * There is an old value, but no new value ('no' (unset) 1043 * isn't saved in auto.conf, so the old value is always 1044 * different from 'no'). 1045 */ 1046 1047 res = conf_touch_dep(sym->name); 1048 if (res) 1049 return res; 1050 } 1051 1052 return 0; 1053 } 1054 1055 static int __conf_write_autoconf(const char *filename, 1056 void (*print_symbol)(FILE *, struct symbol *), 1057 const struct comment_style *comment_style) 1058 { 1059 char tmp[PATH_MAX]; 1060 FILE *file; 1061 struct symbol *sym; 1062 int ret; 1063 1064 if (make_parent_dir(filename)) 1065 return -1; 1066 1067 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename); 1068 if (ret >= sizeof(tmp)) /* check truncation */ 1069 return -1; 1070 1071 file = fopen(tmp, "w"); 1072 if (!file) { 1073 perror("fopen"); 1074 return -1; 1075 } 1076 1077 conf_write_heading(file, comment_style); 1078 1079 for_all_symbols(sym) 1080 if ((sym->flags & SYMBOL_WRITE) && sym->name) 1081 print_symbol(file, sym); 1082 1083 fflush(file); 1084 /* check possible errors in conf_write_heading() and print_symbol() */ 1085 ret = ferror(file); 1086 fclose(file); 1087 if (ret) 1088 return -1; 1089 1090 if (rename(tmp, filename)) { 1091 perror("rename"); 1092 return -1; 1093 } 1094 1095 return 0; 1096 } 1097 1098 int conf_write_autoconf(int overwrite) 1099 { 1100 struct symbol *sym; 1101 const char *autoconf_name = conf_get_autoconfig_name(); 1102 int ret; 1103 1104 if (!overwrite && is_present(autoconf_name)) 1105 return 0; 1106 1107 ret = conf_write_autoconf_cmd(autoconf_name); 1108 if (ret) 1109 return -1; 1110 1111 if (conf_touch_deps()) 1112 return 1; 1113 1114 for_all_symbols(sym) 1115 sym_calc_value(sym); 1116 1117 ret = __conf_write_autoconf(conf_get_autoheader_name(), 1118 print_symbol_for_c, 1119 &comment_style_c); 1120 if (ret) 1121 return ret; 1122 1123 ret = __conf_write_autoconf(conf_get_rustccfg_name(), 1124 print_symbol_for_rustccfg, 1125 NULL); 1126 if (ret) 1127 return ret; 1128 1129 /* 1130 * Create include/config/auto.conf. This must be the last step because 1131 * Kbuild has a dependency on auto.conf and this marks the successful 1132 * completion of the previous steps. 1133 */ 1134 ret = __conf_write_autoconf(conf_get_autoconfig_name(), 1135 print_symbol_for_autoconf, 1136 &comment_style_pound); 1137 if (ret) 1138 return ret; 1139 1140 return 0; 1141 } 1142 1143 static bool conf_changed; 1144 static void (*conf_changed_callback)(void); 1145 1146 void conf_set_changed(bool val) 1147 { 1148 bool changed = conf_changed != val; 1149 1150 conf_changed = val; 1151 1152 if (conf_changed_callback && changed) 1153 conf_changed_callback(); 1154 } 1155 1156 bool conf_get_changed(void) 1157 { 1158 return conf_changed; 1159 } 1160 1161 void conf_set_changed_callback(void (*fn)(void)) 1162 { 1163 conf_changed_callback = fn; 1164 } 1165 1166 void set_all_choice_values(struct symbol *csym) 1167 { 1168 struct property *prop; 1169 struct symbol *sym; 1170 struct expr *e; 1171 1172 prop = sym_get_choice_prop(csym); 1173 1174 /* 1175 * Set all non-assinged choice values to no 1176 */ 1177 expr_list_for_each_sym(prop->expr, e, sym) { 1178 if (!sym_has_value(sym)) 1179 sym->def[S_DEF_USER].tri = no; 1180 } 1181 csym->flags |= SYMBOL_DEF_USER; 1182 /* clear VALID to get value calculated */ 1183 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES); 1184 } 1185