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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 <xalloc.h>
22#include "internal.h"
23#include "lkc.h"
24
25struct gstr autoconf_cmd;
26
27/* return true if 'path' exists, false otherwise */
28static bool is_present(const char *path)
29{
30 struct stat st;
31
32 return !stat(path, &st);
33}
34
35/* return true if 'path' exists and it is a directory, false otherwise */
36static bool is_dir(const char *path)
37{
38 struct stat st;
39
40 if (stat(path, &st))
41 return false;
42
43 return S_ISDIR(st.st_mode);
44}
45
46/* return true if the given two files are the same, false otherwise */
47static bool is_same(const char *file1, const char *file2)
48{
49 int fd1, fd2;
50 struct stat st1, st2;
51 void *map1, *map2;
52 bool ret = false;
53
54 fd1 = open(file1, O_RDONLY);
55 if (fd1 < 0)
56 return ret;
57
58 fd2 = open(file2, O_RDONLY);
59 if (fd2 < 0)
60 goto close1;
61
62 ret = fstat(fd1, &st1);
63 if (ret)
64 goto close2;
65 ret = fstat(fd2, &st2);
66 if (ret)
67 goto close2;
68
69 if (st1.st_size != st2.st_size)
70 goto close2;
71
72 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
73 if (map1 == MAP_FAILED)
74 goto close2;
75
76 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
77 if (map2 == MAP_FAILED)
78 goto close2;
79
80 if (bcmp(map1, map2, st1.st_size))
81 goto close2;
82
83 ret = true;
84close2:
85 close(fd2);
86close1:
87 close(fd1);
88
89 return ret;
90}
91
92/*
93 * Create the parent directory of the given path.
94 *
95 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
96 */
97static int make_parent_dir(const char *path)
98{
99 char tmp[PATH_MAX + 1];
100 char *p;
101
102 strncpy(tmp, path, sizeof(tmp));
103 tmp[sizeof(tmp) - 1] = 0;
104
105 /* Remove the base name. Just return if nothing is left */
106 p = strrchr(tmp, '/');
107 if (!p)
108 return 0;
109 *(p + 1) = 0;
110
111 /* Just in case it is an absolute path */
112 p = tmp;
113 while (*p == '/')
114 p++;
115
116 while ((p = strchr(p, '/'))) {
117 *p = 0;
118
119 /* skip if the directory exists */
120 if (!is_dir(tmp) && mkdir(tmp, 0755))
121 return -1;
122
123 *p = '/';
124 while (*p == '/')
125 p++;
126 }
127
128 return 0;
129}
130
131static char depfile_path[PATH_MAX];
132static size_t depfile_prefix_len;
133
134/* touch depfile for symbol 'name' */
135static int conf_touch_dep(const char *name)
136{
137 int fd;
138
139 /* check overflow: prefix + name + '\0' must fit in buffer. */
140 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
141 return -1;
142
143 strcpy(depfile_path + depfile_prefix_len, name);
144
145 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
146 if (fd == -1)
147 return -1;
148 close(fd);
149
150 return 0;
151}
152
153static void conf_warning(const char *fmt, ...)
154 __attribute__ ((format (printf, 1, 2)));
155
156static void conf_message(const char *fmt, ...)
157 __attribute__ ((format (printf, 1, 2)));
158
159static const char *conf_filename;
160static int conf_lineno, conf_warnings;
161
162bool conf_errors(void)
163{
164 if (conf_warnings)
165 return getenv("KCONFIG_WERROR");
166 return false;
167}
168
169static void conf_warning(const char *fmt, ...)
170{
171 va_list ap;
172 va_start(ap, fmt);
173 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
174 vfprintf(stderr, fmt, ap);
175 fprintf(stderr, "\n");
176 va_end(ap);
177 conf_warnings++;
178}
179
180static void conf_default_message_callback(const char *s)
181{
182 printf("#\n# ");
183 printf("%s", s);
184 printf("\n#\n");
185}
186
187static void (*conf_message_callback)(const char *s) =
188 conf_default_message_callback;
189void conf_set_message_callback(void (*fn)(const char *s))
190{
191 conf_message_callback = fn;
192}
193
194static void conf_message(const char *fmt, ...)
195{
196 va_list ap;
197 char buf[4096];
198
199 if (!conf_message_callback)
200 return;
201
202 va_start(ap, fmt);
203
204 vsnprintf(buf, sizeof(buf), fmt, ap);
205 conf_message_callback(buf);
206 va_end(ap);
207}
208
209const char *conf_get_configname(void)
210{
211 char *name = getenv("KCONFIG_CONFIG");
212
213 return name ? name : ".config";
214}
215
216static const char *conf_get_autoconfig_name(void)
217{
218 char *name = getenv("KCONFIG_AUTOCONFIG");
219
220 return name ? name : "include/config/auto.conf";
221}
222
223static const char *conf_get_autoheader_name(void)
224{
225 char *name = getenv("KCONFIG_AUTOHEADER");
226
227 return name ? name : "include/generated/autoconf.h";
228}
229
230static const char *conf_get_rustccfg_name(void)
231{
232 char *name = getenv("KCONFIG_RUSTCCFG");
233
234 return name ? name : "include/generated/rustc_cfg";
235}
236
237static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
238{
239 char *p2;
240
241 switch (sym->type) {
242 case S_TRISTATE:
243 if (p[0] == 'm') {
244 sym->def[def].tri = mod;
245 sym->flags |= def_flags;
246 break;
247 }
248 /* fall through */
249 case S_BOOLEAN:
250 if (p[0] == 'y') {
251 sym->def[def].tri = yes;
252 sym->flags |= def_flags;
253 break;
254 }
255 if (p[0] == 'n') {
256 sym->def[def].tri = no;
257 sym->flags |= def_flags;
258 break;
259 }
260 if (def != S_DEF_AUTO)
261 conf_warning("symbol value '%s' invalid for %s",
262 p, sym->name);
263 return 1;
264 case S_STRING:
265 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
266 if (def != S_DEF_AUTO) {
267 if (*p++ != '"')
268 break;
269 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
270 if (*p2 == '"') {
271 *p2 = 0;
272 break;
273 }
274 memmove(p2, p2 + 1, strlen(p2));
275 }
276 if (!p2) {
277 conf_warning("invalid string found");
278 return 1;
279 }
280 }
281 /* fall through */
282 case S_INT:
283 case S_HEX:
284 if (sym_string_valid(sym, p)) {
285 sym->def[def].val = xstrdup(p);
286 sym->flags |= def_flags;
287 } else {
288 if (def != S_DEF_AUTO)
289 conf_warning("symbol value '%s' invalid for %s",
290 p, sym->name);
291 return 1;
292 }
293 break;
294 default:
295 ;
296 }
297 return 0;
298}
299
300/* like getline(), but the newline character is stripped away */
301static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
302{
303 ssize_t len;
304
305 len = getline(lineptr, n, stream);
306
307 if (len > 0 && (*lineptr)[len - 1] == '\n') {
308 len--;
309 (*lineptr)[len] = '\0';
310
311 if (len > 0 && (*lineptr)[len - 1] == '\r') {
312 len--;
313 (*lineptr)[len] = '\0';
314 }
315 }
316
317 return len;
318}
319
320int 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, *val;
326 struct symbol *sym;
327 int def_flags;
328 const char *warn_unknown, *sym_name;
329
330 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
331 if (name) {
332 in = zconf_fopen(name);
333 } else {
334 char *env;
335
336 name = conf_get_configname();
337 in = zconf_fopen(name);
338 if (in)
339 goto load;
340 conf_set_changed(true);
341
342 env = getenv("KCONFIG_DEFCONFIG_LIST");
343 if (!env)
344 return 1;
345
346 while (1) {
347 bool is_last;
348
349 while (isspace(*env))
350 env++;
351
352 if (!*env)
353 break;
354
355 p = env;
356 while (*p && !isspace(*p))
357 p++;
358
359 is_last = (*p == '\0');
360
361 *p = '\0';
362
363 name = env;
364
365 in = zconf_fopen(name);
366 if (in) {
367 conf_message("using defaults found in %s",
368 name);
369 goto load;
370 }
371
372 if (is_last)
373 break;
374
375 env = p + 1;
376 }
377 }
378 if (!in)
379 return 1;
380
381load:
382 conf_filename = name;
383 conf_lineno = 0;
384 conf_warnings = 0;
385
386 def_flags = SYMBOL_DEF << def;
387 for_all_symbols(sym) {
388 sym->flags &= ~(def_flags|SYMBOL_VALID);
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 expr_invalidate_all();
402
403 while (getline_stripped(&line, &line_asize, in) != -1) {
404 struct menu *choice;
405
406 conf_lineno++;
407
408 if (!line[0]) /* blank line */
409 continue;
410
411 if (line[0] == '#') {
412 if (line[1] != ' ')
413 continue;
414 p = line + 2;
415 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
416 continue;
417 sym_name = p + strlen(CONFIG_);
418 p = strchr(sym_name, ' ');
419 if (!p)
420 continue;
421 *p++ = 0;
422 if (strcmp(p, "is not set"))
423 continue;
424
425 val = "n";
426 } else {
427 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
428 conf_warning("unexpected data: %s", line);
429 continue;
430 }
431
432 sym_name = line + strlen(CONFIG_);
433 p = strchr(sym_name, '=');
434 if (!p) {
435 conf_warning("unexpected data: %s", line);
436 continue;
437 }
438 *p = 0;
439 val = p + 1;
440 }
441
442 sym = sym_find(sym_name);
443 if (!sym) {
444 if (def == S_DEF_AUTO) {
445 /*
446 * Reading from include/config/auto.conf.
447 * If CONFIG_FOO previously existed in auto.conf
448 * but it is missing now, include/config/FOO
449 * must be touched.
450 */
451 conf_touch_dep(sym_name);
452 } else {
453 if (warn_unknown)
454 conf_warning("unknown symbol: %s", sym_name);
455
456 conf_set_changed(true);
457 }
458 continue;
459 }
460
461 if (sym->flags & def_flags)
462 conf_warning("override: reassigning to symbol %s", sym->name);
463
464 if (conf_set_sym_val(sym, def, def_flags, val))
465 continue;
466
467 /*
468 * If this is a choice member, give it the highest priority.
469 * If conflicting CONFIG options are given from an input file,
470 * the last one wins.
471 */
472 choice = sym_get_choice_menu(sym);
473 if (choice)
474 list_move(&sym->choice_link, &choice->choice_members);
475 }
476 free(line);
477 fclose(in);
478
479 return 0;
480}
481
482int conf_read(const char *name)
483{
484 struct symbol *sym;
485
486 conf_set_changed(false);
487
488 if (conf_read_simple(name, S_DEF_USER)) {
489 sym_calc_value(modules_sym);
490 return 1;
491 }
492
493 sym_calc_value(modules_sym);
494
495 for_all_symbols(sym) {
496 sym_calc_value(sym);
497 if (sym_is_choice(sym))
498 continue;
499 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
500 /* check that calculated value agrees with saved value */
501 switch (sym->type) {
502 case S_BOOLEAN:
503 case S_TRISTATE:
504 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
505 continue;
506 break;
507 default:
508 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
509 continue;
510 break;
511 }
512 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
513 /* no previous value and not saved */
514 continue;
515 conf_set_changed(true);
516 /* maybe print value in verbose mode... */
517 }
518
519 if (conf_warnings)
520 conf_set_changed(true);
521
522 return 0;
523}
524
525struct comment_style {
526 const char *decoration;
527 const char *prefix;
528 const char *postfix;
529};
530
531static const struct comment_style comment_style_pound = {
532 .decoration = "#",
533 .prefix = "#",
534 .postfix = "#",
535};
536
537static const struct comment_style comment_style_c = {
538 .decoration = " *",
539 .prefix = "/*",
540 .postfix = " */",
541};
542
543static void conf_write_heading(FILE *fp, const struct comment_style *cs)
544{
545 if (!cs)
546 return;
547
548 fprintf(fp, "%s\n", cs->prefix);
549
550 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
551 cs->decoration);
552
553 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
554
555 fprintf(fp, "%s\n", cs->postfix);
556}
557
558/* The returned pointer must be freed on the caller side */
559static char *escape_string_value(const char *in)
560{
561 const char *p;
562 char *out;
563 size_t len;
564
565 len = strlen(in) + strlen("\"\"") + 1;
566
567 p = in;
568 while (1) {
569 p += strcspn(p, "\"\\");
570
571 if (p[0] == '\0')
572 break;
573
574 len++;
575 p++;
576 }
577
578 out = xmalloc(len);
579 out[0] = '\0';
580
581 strcat(out, "\"");
582
583 p = in;
584 while (1) {
585 len = strcspn(p, "\"\\");
586 strncat(out, p, len);
587 p += len;
588
589 if (p[0] == '\0')
590 break;
591
592 strcat(out, "\\");
593 strncat(out, p++, 1);
594 }
595
596 strcat(out, "\"");
597
598 return out;
599}
600
601enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
602
603static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
604 bool escape_string)
605{
606 const char *val;
607 char *escaped = NULL;
608
609 if (sym->type == S_UNKNOWN)
610 return;
611
612 val = sym_get_string_value(sym);
613
614 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
615 output_n != OUTPUT_N && *val == 'n') {
616 if (output_n == OUTPUT_N_AS_UNSET)
617 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
618 return;
619 }
620
621 if (sym->type == S_STRING && escape_string) {
622 escaped = escape_string_value(val);
623 val = escaped;
624 }
625
626 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
627
628 free(escaped);
629}
630
631static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
632{
633 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
634}
635
636static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
637{
638 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
639}
640
641void print_symbol_for_listconfig(struct symbol *sym)
642{
643 __print_symbol(stdout, sym, OUTPUT_N, true);
644}
645
646static void print_symbol_for_c(FILE *fp, struct symbol *sym)
647{
648 const char *val;
649 const char *sym_suffix = "";
650 const char *val_prefix = "";
651 char *escaped = NULL;
652
653 if (sym->type == S_UNKNOWN)
654 return;
655
656 val = sym_get_string_value(sym);
657
658 switch (sym->type) {
659 case S_BOOLEAN:
660 case S_TRISTATE:
661 switch (*val) {
662 case 'n':
663 return;
664 case 'm':
665 sym_suffix = "_MODULE";
666 /* fall through */
667 default:
668 val = "1";
669 }
670 break;
671 case S_HEX:
672 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
673 val_prefix = "0x";
674 break;
675 case S_STRING:
676 escaped = escape_string_value(val);
677 val = escaped;
678 default:
679 break;
680 }
681
682 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
683 val_prefix, val);
684
685 free(escaped);
686}
687
688static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
689{
690 const char *val;
691 const char *val_prefix = "";
692 char *val_prefixed = NULL;
693 size_t val_prefixed_len;
694 char *escaped = NULL;
695
696 if (sym->type == S_UNKNOWN)
697 return;
698
699 val = sym_get_string_value(sym);
700
701 switch (sym->type) {
702 case S_BOOLEAN:
703 case S_TRISTATE:
704 /*
705 * We do not care about disabled ones, i.e. no need for
706 * what otherwise are "comments" in other printers.
707 */
708 if (*val == 'n')
709 return;
710
711 /*
712 * To have similar functionality to the C macro `IS_ENABLED()`
713 * we provide an empty `--cfg CONFIG_X` here in both `y`
714 * and `m` cases.
715 *
716 * Then, the common `fprintf()` below will also give us
717 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
718 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
719 */
720 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
721 break;
722 case S_HEX:
723 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
724 val_prefix = "0x";
725 break;
726 default:
727 break;
728 }
729
730 if (strlen(val_prefix) > 0) {
731 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
732 val_prefixed = xmalloc(val_prefixed_len);
733 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
734 val = val_prefixed;
735 }
736
737 /* All values get escaped: the `--cfg` option only takes strings */
738 escaped = escape_string_value(val);
739 val = escaped;
740
741 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
742
743 free(escaped);
744 free(val_prefixed);
745}
746
747/*
748 * Write out a minimal config.
749 * All values that has default values are skipped as this is redundant.
750 */
751int conf_write_defconfig(const char *filename)
752{
753 struct symbol *sym;
754 struct menu *menu;
755 FILE *out;
756
757 out = fopen(filename, "w");
758 if (!out)
759 return 1;
760
761 sym_clear_all_valid();
762
763 menu_for_each_entry(menu) {
764 struct menu *choice;
765
766 sym = menu->sym;
767
768 if (!sym || sym_is_choice(sym))
769 continue;
770
771 sym_calc_value(sym);
772 if (!(sym->flags & SYMBOL_WRITE))
773 continue;
774 sym->flags &= ~SYMBOL_WRITE;
775 /* Skip unchangeable symbols */
776 if (!sym_is_changeable(sym))
777 continue;
778 /* Skip symbols that are equal to the default */
779 if (!strcmp(sym_get_string_value(sym), sym_get_string_default(sym)))
780 continue;
781
782 /* Skip choice values that are equal to the default */
783 choice = sym_get_choice_menu(sym);
784 if (choice) {
785 struct symbol *ds;
786
787 ds = sym_choice_default(choice);
788 if (sym == ds && sym_get_tristate_value(sym) == yes)
789 continue;
790 }
791 print_symbol_for_dotconfig(out, sym);
792 }
793 fclose(out);
794 return 0;
795}
796
797int conf_write(const char *name)
798{
799 FILE *out;
800 struct symbol *sym;
801 struct menu *menu;
802 const char *str;
803 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
804 char *env;
805 bool need_newline = false;
806
807 if (!name)
808 name = conf_get_configname();
809
810 if (!*name) {
811 fprintf(stderr, "config name is empty\n");
812 return -1;
813 }
814
815 if (is_dir(name)) {
816 fprintf(stderr, "%s: Is a directory\n", name);
817 return -1;
818 }
819
820 if (make_parent_dir(name))
821 return -1;
822
823 env = getenv("KCONFIG_OVERWRITECONFIG");
824 if (env && *env) {
825 *tmpname = 0;
826 out = fopen(name, "w");
827 } else {
828 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
829 name, (int)getpid());
830 out = fopen(tmpname, "w");
831 }
832 if (!out)
833 return 1;
834
835 conf_write_heading(out, &comment_style_pound);
836
837 if (!conf_get_changed())
838 sym_clear_all_valid();
839
840 menu = rootmenu.list;
841 while (menu) {
842 sym = menu->sym;
843 if (!sym) {
844 if (!menu_is_visible(menu))
845 goto next;
846 str = menu_get_prompt(menu);
847 fprintf(out, "\n"
848 "#\n"
849 "# %s\n"
850 "#\n", str);
851 need_newline = false;
852 } else if (!sym_is_choice(sym) &&
853 !(sym->flags & SYMBOL_WRITTEN)) {
854 sym_calc_value(sym);
855 if (!(sym->flags & SYMBOL_WRITE))
856 goto next;
857 if (need_newline) {
858 fprintf(out, "\n");
859 need_newline = false;
860 }
861 sym->flags |= SYMBOL_WRITTEN;
862 print_symbol_for_dotconfig(out, sym);
863 }
864
865next:
866 if (menu->list) {
867 menu = menu->list;
868 continue;
869 }
870
871end_check:
872 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
873 menu->prompt->type == P_MENU) {
874 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
875 need_newline = true;
876 }
877
878 if (menu->next) {
879 menu = menu->next;
880 } else {
881 menu = menu->parent;
882 if (menu)
883 goto end_check;
884 }
885 }
886 fclose(out);
887
888 for_all_symbols(sym)
889 sym->flags &= ~SYMBOL_WRITTEN;
890
891 if (*tmpname) {
892 if (is_same(name, tmpname)) {
893 conf_message("No change to %s", name);
894 unlink(tmpname);
895 conf_set_changed(false);
896 return 0;
897 }
898
899 snprintf(oldname, sizeof(oldname), "%s.old", name);
900 rename(name, oldname);
901 if (rename(tmpname, name))
902 return 1;
903 }
904
905 conf_message("configuration written to %s", name);
906
907 conf_set_changed(false);
908
909 return 0;
910}
911
912/* write a dependency file as used by kbuild to track dependencies */
913static int conf_write_autoconf_cmd(const char *autoconf_name)
914{
915 char name[PATH_MAX], tmp[PATH_MAX];
916 FILE *out;
917 int ret;
918
919 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
920 if (ret >= sizeof(name)) /* check truncation */
921 return -1;
922
923 if (make_parent_dir(name))
924 return -1;
925
926 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
927 if (ret >= sizeof(tmp)) /* check truncation */
928 return -1;
929
930 out = fopen(tmp, "w");
931 if (!out) {
932 perror("fopen");
933 return -1;
934 }
935
936 fprintf(out, "autoconfig := %s\n", autoconf_name);
937
938 fputs(str_get(&autoconf_cmd), out);
939
940 fflush(out);
941 ret = ferror(out); /* error check for all fprintf() calls */
942 fclose(out);
943 if (ret)
944 return -1;
945
946 if (rename(tmp, name)) {
947 perror("rename");
948 return -1;
949 }
950
951 return 0;
952}
953
954static int conf_touch_deps(void)
955{
956 const char *name, *tmp;
957 struct symbol *sym;
958 int res;
959
960 name = conf_get_autoconfig_name();
961 tmp = strrchr(name, '/');
962 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
963 if (depfile_prefix_len + 1 > sizeof(depfile_path))
964 return -1;
965
966 strncpy(depfile_path, name, depfile_prefix_len);
967 depfile_path[depfile_prefix_len] = 0;
968
969 conf_read_simple(name, S_DEF_AUTO);
970 sym_calc_value(modules_sym);
971
972 for_all_symbols(sym) {
973 sym_calc_value(sym);
974 if (sym_is_choice(sym))
975 continue;
976 if (sym->flags & SYMBOL_WRITE) {
977 if (sym->flags & SYMBOL_DEF_AUTO) {
978 /*
979 * symbol has old and new value,
980 * so compare them...
981 */
982 switch (sym->type) {
983 case S_BOOLEAN:
984 case S_TRISTATE:
985 if (sym_get_tristate_value(sym) ==
986 sym->def[S_DEF_AUTO].tri)
987 continue;
988 break;
989 case S_STRING:
990 case S_HEX:
991 case S_INT:
992 if (!strcmp(sym_get_string_value(sym),
993 sym->def[S_DEF_AUTO].val))
994 continue;
995 break;
996 default:
997 break;
998 }
999 } else {
1000 /*
1001 * If there is no old value, only 'no' (unset)
1002 * is allowed as new value.
1003 */
1004 switch (sym->type) {
1005 case S_BOOLEAN:
1006 case S_TRISTATE:
1007 if (sym_get_tristate_value(sym) == no)
1008 continue;
1009 break;
1010 default:
1011 break;
1012 }
1013 }
1014 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1015 /* There is neither an old nor a new value. */
1016 continue;
1017 /* else
1018 * There is an old value, but no new value ('no' (unset)
1019 * isn't saved in auto.conf, so the old value is always
1020 * different from 'no').
1021 */
1022
1023 res = conf_touch_dep(sym->name);
1024 if (res)
1025 return res;
1026 }
1027
1028 return 0;
1029}
1030
1031static int __conf_write_autoconf(const char *filename,
1032 void (*print_symbol)(FILE *, struct symbol *),
1033 const struct comment_style *comment_style)
1034{
1035 char tmp[PATH_MAX];
1036 FILE *file;
1037 struct symbol *sym;
1038 int ret;
1039
1040 if (make_parent_dir(filename))
1041 return -1;
1042
1043 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1044 if (ret >= sizeof(tmp)) /* check truncation */
1045 return -1;
1046
1047 file = fopen(tmp, "w");
1048 if (!file) {
1049 perror("fopen");
1050 return -1;
1051 }
1052
1053 conf_write_heading(file, comment_style);
1054
1055 for_all_symbols(sym)
1056 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1057 print_symbol(file, sym);
1058
1059 fflush(file);
1060 /* check possible errors in conf_write_heading() and print_symbol() */
1061 ret = ferror(file);
1062 fclose(file);
1063 if (ret)
1064 return -1;
1065
1066 if (rename(tmp, filename)) {
1067 perror("rename");
1068 return -1;
1069 }
1070
1071 return 0;
1072}
1073
1074int conf_write_autoconf(int overwrite)
1075{
1076 struct symbol *sym;
1077 const char *autoconf_name = conf_get_autoconfig_name();
1078 int ret;
1079
1080 if (!overwrite && is_present(autoconf_name))
1081 return 0;
1082
1083 ret = conf_write_autoconf_cmd(autoconf_name);
1084 if (ret)
1085 return -1;
1086
1087 if (conf_touch_deps())
1088 return 1;
1089
1090 for_all_symbols(sym)
1091 sym_calc_value(sym);
1092
1093 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1094 print_symbol_for_c,
1095 &comment_style_c);
1096 if (ret)
1097 return ret;
1098
1099 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1100 print_symbol_for_rustccfg,
1101 NULL);
1102 if (ret)
1103 return ret;
1104
1105 /*
1106 * Create include/config/auto.conf. This must be the last step because
1107 * Kbuild has a dependency on auto.conf and this marks the successful
1108 * completion of the previous steps.
1109 */
1110 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1111 print_symbol_for_autoconf,
1112 &comment_style_pound);
1113 if (ret)
1114 return ret;
1115
1116 return 0;
1117}
1118
1119static bool conf_changed;
1120static void (*conf_changed_callback)(bool);
1121
1122void conf_set_changed(bool val)
1123{
1124 if (conf_changed_callback && conf_changed != val)
1125 conf_changed_callback(val);
1126
1127 conf_changed = val;
1128}
1129
1130bool conf_get_changed(void)
1131{
1132 return conf_changed;
1133}
1134
1135void conf_set_changed_callback(void (*fn)(bool))
1136{
1137 conf_changed_callback = fn;
1138}
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
24struct gstr autoconf_cmd;
25
26/* return true if 'path' exists, false otherwise */
27static 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 */
35static 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 */
46static 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;
83close2:
84 close(fd2);
85close1:
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 */
96static 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
130static char depfile_path[PATH_MAX];
131static size_t depfile_prefix_len;
132
133/* touch depfile for symbol 'name' */
134static 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
152static void conf_warning(const char *fmt, ...)
153 __attribute__ ((format (printf, 1, 2)));
154
155static void conf_message(const char *fmt, ...)
156 __attribute__ ((format (printf, 1, 2)));
157
158static const char *conf_filename;
159static int conf_lineno, conf_warnings;
160
161bool conf_errors(void)
162{
163 if (conf_warnings)
164 return getenv("KCONFIG_WERROR");
165 return false;
166}
167
168static 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
179static void conf_default_message_callback(const char *s)
180{
181 printf("#\n# ");
182 printf("%s", s);
183 printf("\n#\n");
184}
185
186static void (*conf_message_callback)(const char *s) =
187 conf_default_message_callback;
188void conf_set_message_callback(void (*fn)(const char *s))
189{
190 conf_message_callback = fn;
191}
192
193static 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
208const char *conf_get_configname(void)
209{
210 char *name = getenv("KCONFIG_CONFIG");
211
212 return name ? name : ".config";
213}
214
215static 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
222static 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
229static 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
236static 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 */
300static 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
319int 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
378load:
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
489int 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) || (sym->flags & SYMBOL_NO_WRITE))
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 switch (sym->type) {
537 case S_STRING:
538 case S_INT:
539 case S_HEX:
540 /* Reset a string value if it's out of range */
541 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
542 break;
543 sym->flags &= ~SYMBOL_VALID;
544 conf_unsaved++;
545 break;
546 default:
547 break;
548 }
549 }
550 }
551
552 if (conf_warnings || conf_unsaved)
553 conf_set_changed(true);
554
555 return 0;
556}
557
558struct comment_style {
559 const char *decoration;
560 const char *prefix;
561 const char *postfix;
562};
563
564static const struct comment_style comment_style_pound = {
565 .decoration = "#",
566 .prefix = "#",
567 .postfix = "#",
568};
569
570static const struct comment_style comment_style_c = {
571 .decoration = " *",
572 .prefix = "/*",
573 .postfix = " */",
574};
575
576static void conf_write_heading(FILE *fp, const struct comment_style *cs)
577{
578 if (!cs)
579 return;
580
581 fprintf(fp, "%s\n", cs->prefix);
582
583 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
584 cs->decoration);
585
586 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
587
588 fprintf(fp, "%s\n", cs->postfix);
589}
590
591/* The returned pointer must be freed on the caller side */
592static char *escape_string_value(const char *in)
593{
594 const char *p;
595 char *out;
596 size_t len;
597
598 len = strlen(in) + strlen("\"\"") + 1;
599
600 p = in;
601 while (1) {
602 p += strcspn(p, "\"\\");
603
604 if (p[0] == '\0')
605 break;
606
607 len++;
608 p++;
609 }
610
611 out = xmalloc(len);
612 out[0] = '\0';
613
614 strcat(out, "\"");
615
616 p = in;
617 while (1) {
618 len = strcspn(p, "\"\\");
619 strncat(out, p, len);
620 p += len;
621
622 if (p[0] == '\0')
623 break;
624
625 strcat(out, "\\");
626 strncat(out, p++, 1);
627 }
628
629 strcat(out, "\"");
630
631 return out;
632}
633
634enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
635
636static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
637 bool escape_string)
638{
639 const char *val;
640 char *escaped = NULL;
641
642 if (sym->type == S_UNKNOWN)
643 return;
644
645 val = sym_get_string_value(sym);
646
647 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
648 output_n != OUTPUT_N && *val == 'n') {
649 if (output_n == OUTPUT_N_AS_UNSET)
650 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
651 return;
652 }
653
654 if (sym->type == S_STRING && escape_string) {
655 escaped = escape_string_value(val);
656 val = escaped;
657 }
658
659 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
660
661 free(escaped);
662}
663
664static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
665{
666 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
667}
668
669static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
670{
671 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
672}
673
674void print_symbol_for_listconfig(struct symbol *sym)
675{
676 __print_symbol(stdout, sym, OUTPUT_N, true);
677}
678
679static void print_symbol_for_c(FILE *fp, struct symbol *sym)
680{
681 const char *val;
682 const char *sym_suffix = "";
683 const char *val_prefix = "";
684 char *escaped = NULL;
685
686 if (sym->type == S_UNKNOWN)
687 return;
688
689 val = sym_get_string_value(sym);
690
691 switch (sym->type) {
692 case S_BOOLEAN:
693 case S_TRISTATE:
694 switch (*val) {
695 case 'n':
696 return;
697 case 'm':
698 sym_suffix = "_MODULE";
699 /* fall through */
700 default:
701 val = "1";
702 }
703 break;
704 case S_HEX:
705 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
706 val_prefix = "0x";
707 break;
708 case S_STRING:
709 escaped = escape_string_value(val);
710 val = escaped;
711 default:
712 break;
713 }
714
715 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
716 val_prefix, val);
717
718 free(escaped);
719}
720
721static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
722{
723 const char *val;
724 const char *val_prefix = "";
725 char *val_prefixed = NULL;
726 size_t val_prefixed_len;
727 char *escaped = NULL;
728
729 if (sym->type == S_UNKNOWN)
730 return;
731
732 val = sym_get_string_value(sym);
733
734 switch (sym->type) {
735 case S_BOOLEAN:
736 case S_TRISTATE:
737 /*
738 * We do not care about disabled ones, i.e. no need for
739 * what otherwise are "comments" in other printers.
740 */
741 if (*val == 'n')
742 return;
743
744 /*
745 * To have similar functionality to the C macro `IS_ENABLED()`
746 * we provide an empty `--cfg CONFIG_X` here in both `y`
747 * and `m` cases.
748 *
749 * Then, the common `fprintf()` below will also give us
750 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
751 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
752 */
753 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
754 break;
755 case S_HEX:
756 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
757 val_prefix = "0x";
758 break;
759 default:
760 break;
761 }
762
763 if (strlen(val_prefix) > 0) {
764 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
765 val_prefixed = xmalloc(val_prefixed_len);
766 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
767 val = val_prefixed;
768 }
769
770 /* All values get escaped: the `--cfg` option only takes strings */
771 escaped = escape_string_value(val);
772 val = escaped;
773
774 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
775
776 free(escaped);
777 free(val_prefixed);
778}
779
780/*
781 * Write out a minimal config.
782 * All values that has default values are skipped as this is redundant.
783 */
784int conf_write_defconfig(const char *filename)
785{
786 struct symbol *sym;
787 struct menu *menu;
788 FILE *out;
789
790 out = fopen(filename, "w");
791 if (!out)
792 return 1;
793
794 sym_clear_all_valid();
795
796 /* Traverse all menus to find all relevant symbols */
797 menu = rootmenu.list;
798
799 while (menu != NULL)
800 {
801 sym = menu->sym;
802 if (sym && !sym_is_choice(sym)) {
803 sym_calc_value(sym);
804 if (!(sym->flags & SYMBOL_WRITE))
805 goto next_menu;
806 sym->flags &= ~SYMBOL_WRITE;
807 /* If we cannot change the symbol - skip */
808 if (!sym_is_changeable(sym))
809 goto next_menu;
810 /* If symbol equals to default value - skip */
811 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
812 goto next_menu;
813
814 /*
815 * If symbol is a choice value and equals to the
816 * default for a choice - skip.
817 * But only if value is bool and equal to "y" and
818 * choice is not "optional".
819 * (If choice is "optional" then all values can be "n")
820 */
821 if (sym_is_choice_value(sym)) {
822 struct symbol *cs;
823 struct symbol *ds;
824
825 cs = prop_get_symbol(sym_get_choice_prop(sym));
826 ds = sym_choice_default(cs);
827 if (!sym_is_optional(cs) && sym == ds) {
828 if ((sym->type == S_BOOLEAN) &&
829 sym_get_tristate_value(sym) == yes)
830 goto next_menu;
831 }
832 }
833 print_symbol_for_dotconfig(out, sym);
834 }
835next_menu:
836 if (menu->list != NULL) {
837 menu = menu->list;
838 }
839 else if (menu->next != NULL) {
840 menu = menu->next;
841 } else {
842 while ((menu = menu->parent)) {
843 if (menu->next != NULL) {
844 menu = menu->next;
845 break;
846 }
847 }
848 }
849 }
850 fclose(out);
851 return 0;
852}
853
854int conf_write(const char *name)
855{
856 FILE *out;
857 struct symbol *sym;
858 struct menu *menu;
859 const char *str;
860 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
861 char *env;
862 bool need_newline = false;
863
864 if (!name)
865 name = conf_get_configname();
866
867 if (!*name) {
868 fprintf(stderr, "config name is empty\n");
869 return -1;
870 }
871
872 if (is_dir(name)) {
873 fprintf(stderr, "%s: Is a directory\n", name);
874 return -1;
875 }
876
877 if (make_parent_dir(name))
878 return -1;
879
880 env = getenv("KCONFIG_OVERWRITECONFIG");
881 if (env && *env) {
882 *tmpname = 0;
883 out = fopen(name, "w");
884 } else {
885 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
886 name, (int)getpid());
887 out = fopen(tmpname, "w");
888 }
889 if (!out)
890 return 1;
891
892 conf_write_heading(out, &comment_style_pound);
893
894 if (!conf_get_changed())
895 sym_clear_all_valid();
896
897 menu = rootmenu.list;
898 while (menu) {
899 sym = menu->sym;
900 if (!sym) {
901 if (!menu_is_visible(menu))
902 goto next;
903 str = menu_get_prompt(menu);
904 fprintf(out, "\n"
905 "#\n"
906 "# %s\n"
907 "#\n", str);
908 need_newline = false;
909 } else if (!(sym->flags & SYMBOL_CHOICE) &&
910 !(sym->flags & SYMBOL_WRITTEN)) {
911 sym_calc_value(sym);
912 if (!(sym->flags & SYMBOL_WRITE))
913 goto next;
914 if (need_newline) {
915 fprintf(out, "\n");
916 need_newline = false;
917 }
918 sym->flags |= SYMBOL_WRITTEN;
919 print_symbol_for_dotconfig(out, sym);
920 }
921
922next:
923 if (menu->list) {
924 menu = menu->list;
925 continue;
926 }
927
928end_check:
929 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
930 menu->prompt->type == P_MENU) {
931 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
932 need_newline = true;
933 }
934
935 if (menu->next) {
936 menu = menu->next;
937 } else {
938 menu = menu->parent;
939 if (menu)
940 goto end_check;
941 }
942 }
943 fclose(out);
944
945 for_all_symbols(sym)
946 sym->flags &= ~SYMBOL_WRITTEN;
947
948 if (*tmpname) {
949 if (is_same(name, tmpname)) {
950 conf_message("No change to %s", name);
951 unlink(tmpname);
952 conf_set_changed(false);
953 return 0;
954 }
955
956 snprintf(oldname, sizeof(oldname), "%s.old", name);
957 rename(name, oldname);
958 if (rename(tmpname, name))
959 return 1;
960 }
961
962 conf_message("configuration written to %s", name);
963
964 conf_set_changed(false);
965
966 return 0;
967}
968
969/* write a dependency file as used by kbuild to track dependencies */
970static int conf_write_autoconf_cmd(const char *autoconf_name)
971{
972 char name[PATH_MAX], tmp[PATH_MAX];
973 FILE *out;
974 int ret;
975
976 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
977 if (ret >= sizeof(name)) /* check truncation */
978 return -1;
979
980 if (make_parent_dir(name))
981 return -1;
982
983 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
984 if (ret >= sizeof(tmp)) /* check truncation */
985 return -1;
986
987 out = fopen(tmp, "w");
988 if (!out) {
989 perror("fopen");
990 return -1;
991 }
992
993 fprintf(out, "autoconfig := %s\n", autoconf_name);
994
995 fputs(str_get(&autoconf_cmd), out);
996
997 fflush(out);
998 ret = ferror(out); /* error check for all fprintf() calls */
999 fclose(out);
1000 if (ret)
1001 return -1;
1002
1003 if (rename(tmp, name)) {
1004 perror("rename");
1005 return -1;
1006 }
1007
1008 return 0;
1009}
1010
1011static int conf_touch_deps(void)
1012{
1013 const char *name, *tmp;
1014 struct symbol *sym;
1015 int res;
1016
1017 name = conf_get_autoconfig_name();
1018 tmp = strrchr(name, '/');
1019 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
1020 if (depfile_prefix_len + 1 > sizeof(depfile_path))
1021 return -1;
1022
1023 strncpy(depfile_path, name, depfile_prefix_len);
1024 depfile_path[depfile_prefix_len] = 0;
1025
1026 conf_read_simple(name, S_DEF_AUTO);
1027 sym_calc_value(modules_sym);
1028
1029 for_all_symbols(sym) {
1030 sym_calc_value(sym);
1031 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1032 continue;
1033 if (sym->flags & SYMBOL_WRITE) {
1034 if (sym->flags & SYMBOL_DEF_AUTO) {
1035 /*
1036 * symbol has old and new value,
1037 * so compare them...
1038 */
1039 switch (sym->type) {
1040 case S_BOOLEAN:
1041 case S_TRISTATE:
1042 if (sym_get_tristate_value(sym) ==
1043 sym->def[S_DEF_AUTO].tri)
1044 continue;
1045 break;
1046 case S_STRING:
1047 case S_HEX:
1048 case S_INT:
1049 if (!strcmp(sym_get_string_value(sym),
1050 sym->def[S_DEF_AUTO].val))
1051 continue;
1052 break;
1053 default:
1054 break;
1055 }
1056 } else {
1057 /*
1058 * If there is no old value, only 'no' (unset)
1059 * is allowed as new value.
1060 */
1061 switch (sym->type) {
1062 case S_BOOLEAN:
1063 case S_TRISTATE:
1064 if (sym_get_tristate_value(sym) == no)
1065 continue;
1066 break;
1067 default:
1068 break;
1069 }
1070 }
1071 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1072 /* There is neither an old nor a new value. */
1073 continue;
1074 /* else
1075 * There is an old value, but no new value ('no' (unset)
1076 * isn't saved in auto.conf, so the old value is always
1077 * different from 'no').
1078 */
1079
1080 res = conf_touch_dep(sym->name);
1081 if (res)
1082 return res;
1083 }
1084
1085 return 0;
1086}
1087
1088static int __conf_write_autoconf(const char *filename,
1089 void (*print_symbol)(FILE *, struct symbol *),
1090 const struct comment_style *comment_style)
1091{
1092 char tmp[PATH_MAX];
1093 FILE *file;
1094 struct symbol *sym;
1095 int ret;
1096
1097 if (make_parent_dir(filename))
1098 return -1;
1099
1100 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1101 if (ret >= sizeof(tmp)) /* check truncation */
1102 return -1;
1103
1104 file = fopen(tmp, "w");
1105 if (!file) {
1106 perror("fopen");
1107 return -1;
1108 }
1109
1110 conf_write_heading(file, comment_style);
1111
1112 for_all_symbols(sym)
1113 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1114 print_symbol(file, sym);
1115
1116 fflush(file);
1117 /* check possible errors in conf_write_heading() and print_symbol() */
1118 ret = ferror(file);
1119 fclose(file);
1120 if (ret)
1121 return -1;
1122
1123 if (rename(tmp, filename)) {
1124 perror("rename");
1125 return -1;
1126 }
1127
1128 return 0;
1129}
1130
1131int conf_write_autoconf(int overwrite)
1132{
1133 struct symbol *sym;
1134 const char *autoconf_name = conf_get_autoconfig_name();
1135 int ret;
1136
1137 if (!overwrite && is_present(autoconf_name))
1138 return 0;
1139
1140 ret = conf_write_autoconf_cmd(autoconf_name);
1141 if (ret)
1142 return -1;
1143
1144 if (conf_touch_deps())
1145 return 1;
1146
1147 for_all_symbols(sym)
1148 sym_calc_value(sym);
1149
1150 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1151 print_symbol_for_c,
1152 &comment_style_c);
1153 if (ret)
1154 return ret;
1155
1156 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1157 print_symbol_for_rustccfg,
1158 NULL);
1159 if (ret)
1160 return ret;
1161
1162 /*
1163 * Create include/config/auto.conf. This must be the last step because
1164 * Kbuild has a dependency on auto.conf and this marks the successful
1165 * completion of the previous steps.
1166 */
1167 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1168 print_symbol_for_autoconf,
1169 &comment_style_pound);
1170 if (ret)
1171 return ret;
1172
1173 return 0;
1174}
1175
1176static bool conf_changed;
1177static void (*conf_changed_callback)(void);
1178
1179void conf_set_changed(bool val)
1180{
1181 bool changed = conf_changed != val;
1182
1183 conf_changed = val;
1184
1185 if (conf_changed_callback && changed)
1186 conf_changed_callback();
1187}
1188
1189bool conf_get_changed(void)
1190{
1191 return conf_changed;
1192}
1193
1194void conf_set_changed_callback(void (*fn)(void))
1195{
1196 conf_changed_callback = fn;
1197}
1198
1199void set_all_choice_values(struct symbol *csym)
1200{
1201 struct property *prop;
1202 struct symbol *sym;
1203 struct expr *e;
1204
1205 prop = sym_get_choice_prop(csym);
1206
1207 /*
1208 * Set all non-assinged choice values to no
1209 */
1210 expr_list_for_each_sym(prop->expr, e, sym) {
1211 if (!sym_has_value(sym))
1212 sym->def[S_DEF_USER].tri = no;
1213 }
1214 csym->flags |= SYMBOL_DEF_USER;
1215 /* clear VALID to get value calculated */
1216 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1217}