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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 "lkc.h"
22
23/* return true if 'path' exists, false otherwise */
24static bool is_present(const char *path)
25{
26 struct stat st;
27
28 return !stat(path, &st);
29}
30
31/* return true if 'path' exists and it is a directory, false otherwise */
32static bool is_dir(const char *path)
33{
34 struct stat st;
35
36 if (stat(path, &st))
37 return false;
38
39 return S_ISDIR(st.st_mode);
40}
41
42/* return true if the given two files are the same, false otherwise */
43static bool is_same(const char *file1, const char *file2)
44{
45 int fd1, fd2;
46 struct stat st1, st2;
47 void *map1, *map2;
48 bool ret = false;
49
50 fd1 = open(file1, O_RDONLY);
51 if (fd1 < 0)
52 return ret;
53
54 fd2 = open(file2, O_RDONLY);
55 if (fd2 < 0)
56 goto close1;
57
58 ret = fstat(fd1, &st1);
59 if (ret)
60 goto close2;
61 ret = fstat(fd2, &st2);
62 if (ret)
63 goto close2;
64
65 if (st1.st_size != st2.st_size)
66 goto close2;
67
68 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
69 if (map1 == MAP_FAILED)
70 goto close2;
71
72 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
73 if (map2 == MAP_FAILED)
74 goto close2;
75
76 if (bcmp(map1, map2, st1.st_size))
77 goto close2;
78
79 ret = true;
80close2:
81 close(fd2);
82close1:
83 close(fd1);
84
85 return ret;
86}
87
88/*
89 * Create the parent directory of the given path.
90 *
91 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
92 */
93static int make_parent_dir(const char *path)
94{
95 char tmp[PATH_MAX + 1];
96 char *p;
97
98 strncpy(tmp, path, sizeof(tmp));
99 tmp[sizeof(tmp) - 1] = 0;
100
101 /* Remove the base name. Just return if nothing is left */
102 p = strrchr(tmp, '/');
103 if (!p)
104 return 0;
105 *(p + 1) = 0;
106
107 /* Just in case it is an absolute path */
108 p = tmp;
109 while (*p == '/')
110 p++;
111
112 while ((p = strchr(p, '/'))) {
113 *p = 0;
114
115 /* skip if the directory exists */
116 if (!is_dir(tmp) && mkdir(tmp, 0755))
117 return -1;
118
119 *p = '/';
120 while (*p == '/')
121 p++;
122 }
123
124 return 0;
125}
126
127static char depfile_path[PATH_MAX];
128static size_t depfile_prefix_len;
129
130/* touch depfile for symbol 'name' */
131static int conf_touch_dep(const char *name)
132{
133 int fd;
134
135 /* check overflow: prefix + name + '\0' must fit in buffer. */
136 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
137 return -1;
138
139 strcpy(depfile_path + depfile_prefix_len, name);
140
141 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
142 if (fd == -1)
143 return -1;
144 close(fd);
145
146 return 0;
147}
148
149static void conf_warning(const char *fmt, ...)
150 __attribute__ ((format (printf, 1, 2)));
151
152static void conf_message(const char *fmt, ...)
153 __attribute__ ((format (printf, 1, 2)));
154
155static const char *conf_filename;
156static int conf_lineno, conf_warnings;
157
158static void conf_warning(const char *fmt, ...)
159{
160 va_list ap;
161 va_start(ap, fmt);
162 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
163 vfprintf(stderr, fmt, ap);
164 fprintf(stderr, "\n");
165 va_end(ap);
166 conf_warnings++;
167}
168
169static void conf_default_message_callback(const char *s)
170{
171 printf("#\n# ");
172 printf("%s", s);
173 printf("\n#\n");
174}
175
176static void (*conf_message_callback)(const char *s) =
177 conf_default_message_callback;
178void conf_set_message_callback(void (*fn)(const char *s))
179{
180 conf_message_callback = fn;
181}
182
183static void conf_message(const char *fmt, ...)
184{
185 va_list ap;
186 char buf[4096];
187
188 if (!conf_message_callback)
189 return;
190
191 va_start(ap, fmt);
192
193 vsnprintf(buf, sizeof(buf), fmt, ap);
194 conf_message_callback(buf);
195 va_end(ap);
196}
197
198const char *conf_get_configname(void)
199{
200 char *name = getenv("KCONFIG_CONFIG");
201
202 return name ? name : ".config";
203}
204
205static const char *conf_get_autoconfig_name(void)
206{
207 char *name = getenv("KCONFIG_AUTOCONFIG");
208
209 return name ? name : "include/config/auto.conf";
210}
211
212static const char *conf_get_autoheader_name(void)
213{
214 char *name = getenv("KCONFIG_AUTOHEADER");
215
216 return name ? name : "include/generated/autoconf.h";
217}
218
219static const char *conf_get_rustccfg_name(void)
220{
221 char *name = getenv("KCONFIG_RUSTCCFG");
222
223 return name ? name : "include/generated/rustc_cfg";
224}
225
226static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
227{
228 char *p2;
229
230 switch (sym->type) {
231 case S_TRISTATE:
232 if (p[0] == 'm') {
233 sym->def[def].tri = mod;
234 sym->flags |= def_flags;
235 break;
236 }
237 /* fall through */
238 case S_BOOLEAN:
239 if (p[0] == 'y') {
240 sym->def[def].tri = yes;
241 sym->flags |= def_flags;
242 break;
243 }
244 if (p[0] == 'n') {
245 sym->def[def].tri = no;
246 sym->flags |= def_flags;
247 break;
248 }
249 if (def != S_DEF_AUTO)
250 conf_warning("symbol value '%s' invalid for %s",
251 p, sym->name);
252 return 1;
253 case S_STRING:
254 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
255 if (def != S_DEF_AUTO) {
256 if (*p++ != '"')
257 break;
258 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
259 if (*p2 == '"') {
260 *p2 = 0;
261 break;
262 }
263 memmove(p2, p2 + 1, strlen(p2));
264 }
265 if (!p2) {
266 conf_warning("invalid string found");
267 return 1;
268 }
269 }
270 /* fall through */
271 case S_INT:
272 case S_HEX:
273 if (sym_string_valid(sym, p)) {
274 sym->def[def].val = xstrdup(p);
275 sym->flags |= def_flags;
276 } else {
277 if (def != S_DEF_AUTO)
278 conf_warning("symbol value '%s' invalid for %s",
279 p, sym->name);
280 return 1;
281 }
282 break;
283 default:
284 ;
285 }
286 return 0;
287}
288
289#define LINE_GROWTH 16
290static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
291{
292 char *nline;
293 size_t new_size = slen + 1;
294 if (new_size > *n) {
295 new_size += LINE_GROWTH - 1;
296 new_size *= 2;
297 nline = xrealloc(*lineptr, new_size);
298 if (!nline)
299 return -1;
300
301 *lineptr = nline;
302 *n = new_size;
303 }
304
305 (*lineptr)[slen] = c;
306
307 return 0;
308}
309
310static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
311{
312 char *line = *lineptr;
313 size_t slen = 0;
314
315 for (;;) {
316 int c = getc(stream);
317
318 switch (c) {
319 case '\n':
320 if (add_byte(c, &line, slen, n) < 0)
321 goto e_out;
322 slen++;
323 /* fall through */
324 case EOF:
325 if (add_byte('\0', &line, slen, n) < 0)
326 goto e_out;
327 *lineptr = line;
328 if (slen == 0)
329 return -1;
330 return slen;
331 default:
332 if (add_byte(c, &line, slen, n) < 0)
333 goto e_out;
334 slen++;
335 }
336 }
337
338e_out:
339 line[slen-1] = '\0';
340 *lineptr = line;
341 return -1;
342}
343
344int conf_read_simple(const char *name, int def)
345{
346 FILE *in = NULL;
347 char *line = NULL;
348 size_t line_asize = 0;
349 char *p, *p2;
350 struct symbol *sym;
351 int i, def_flags;
352
353 if (name) {
354 in = zconf_fopen(name);
355 } else {
356 char *env;
357
358 name = conf_get_configname();
359 in = zconf_fopen(name);
360 if (in)
361 goto load;
362 conf_set_changed(true);
363
364 env = getenv("KCONFIG_DEFCONFIG_LIST");
365 if (!env)
366 return 1;
367
368 while (1) {
369 bool is_last;
370
371 while (isspace(*env))
372 env++;
373
374 if (!*env)
375 break;
376
377 p = env;
378 while (*p && !isspace(*p))
379 p++;
380
381 is_last = (*p == '\0');
382
383 *p = '\0';
384
385 in = zconf_fopen(env);
386 if (in) {
387 conf_message("using defaults found in %s",
388 env);
389 goto load;
390 }
391
392 if (is_last)
393 break;
394
395 env = p + 1;
396 }
397 }
398 if (!in)
399 return 1;
400
401load:
402 conf_filename = name;
403 conf_lineno = 0;
404 conf_warnings = 0;
405
406 def_flags = SYMBOL_DEF << def;
407 for_all_symbols(i, sym) {
408 sym->flags |= SYMBOL_CHANGED;
409 sym->flags &= ~(def_flags|SYMBOL_VALID);
410 if (sym_is_choice(sym))
411 sym->flags |= def_flags;
412 switch (sym->type) {
413 case S_INT:
414 case S_HEX:
415 case S_STRING:
416 if (sym->def[def].val)
417 free(sym->def[def].val);
418 /* fall through */
419 default:
420 sym->def[def].val = NULL;
421 sym->def[def].tri = no;
422 }
423 }
424
425 while (compat_getline(&line, &line_asize, in) != -1) {
426 conf_lineno++;
427 sym = NULL;
428 if (line[0] == '#') {
429 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
430 continue;
431 p = strchr(line + 2 + strlen(CONFIG_), ' ');
432 if (!p)
433 continue;
434 *p++ = 0;
435 if (strncmp(p, "is not set", 10))
436 continue;
437 if (def == S_DEF_USER) {
438 sym = sym_find(line + 2 + strlen(CONFIG_));
439 if (!sym) {
440 conf_set_changed(true);
441 continue;
442 }
443 } else {
444 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
445 if (sym->type == S_UNKNOWN)
446 sym->type = S_BOOLEAN;
447 }
448 if (sym->flags & def_flags) {
449 conf_warning("override: reassigning to symbol %s", sym->name);
450 }
451 switch (sym->type) {
452 case S_BOOLEAN:
453 case S_TRISTATE:
454 sym->def[def].tri = no;
455 sym->flags |= def_flags;
456 break;
457 default:
458 ;
459 }
460 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
461 p = strchr(line + strlen(CONFIG_), '=');
462 if (!p)
463 continue;
464 *p++ = 0;
465 p2 = strchr(p, '\n');
466 if (p2) {
467 *p2-- = 0;
468 if (*p2 == '\r')
469 *p2 = 0;
470 }
471
472 sym = sym_find(line + strlen(CONFIG_));
473 if (!sym) {
474 if (def == S_DEF_AUTO)
475 /*
476 * Reading from include/config/auto.conf
477 * If CONFIG_FOO previously existed in
478 * auto.conf but it is missing now,
479 * include/config/FOO must be touched.
480 */
481 conf_touch_dep(line + strlen(CONFIG_));
482 else
483 conf_set_changed(true);
484 continue;
485 }
486
487 if (sym->flags & def_flags) {
488 conf_warning("override: reassigning to symbol %s", sym->name);
489 }
490 if (conf_set_sym_val(sym, def, def_flags, p))
491 continue;
492 } else {
493 if (line[0] != '\r' && line[0] != '\n')
494 conf_warning("unexpected data: %.*s",
495 (int)strcspn(line, "\r\n"), line);
496
497 continue;
498 }
499
500 if (sym && sym_is_choice_value(sym)) {
501 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
502 switch (sym->def[def].tri) {
503 case no:
504 break;
505 case mod:
506 if (cs->def[def].tri == yes) {
507 conf_warning("%s creates inconsistent choice state", sym->name);
508 cs->flags &= ~def_flags;
509 }
510 break;
511 case yes:
512 if (cs->def[def].tri != no)
513 conf_warning("override: %s changes choice state", sym->name);
514 cs->def[def].val = sym;
515 break;
516 }
517 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
518 }
519 }
520 free(line);
521 fclose(in);
522 return 0;
523}
524
525int conf_read(const char *name)
526{
527 struct symbol *sym;
528 int conf_unsaved = 0;
529 int i;
530
531 conf_set_changed(false);
532
533 if (conf_read_simple(name, S_DEF_USER)) {
534 sym_calc_value(modules_sym);
535 return 1;
536 }
537
538 sym_calc_value(modules_sym);
539
540 for_all_symbols(i, sym) {
541 sym_calc_value(sym);
542 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
543 continue;
544 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
545 /* check that calculated value agrees with saved value */
546 switch (sym->type) {
547 case S_BOOLEAN:
548 case S_TRISTATE:
549 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
550 continue;
551 break;
552 default:
553 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
554 continue;
555 break;
556 }
557 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
558 /* no previous value and not saved */
559 continue;
560 conf_unsaved++;
561 /* maybe print value in verbose mode... */
562 }
563
564 for_all_symbols(i, sym) {
565 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
566 /* Reset values of generates values, so they'll appear
567 * as new, if they should become visible, but that
568 * doesn't quite work if the Kconfig and the saved
569 * configuration disagree.
570 */
571 if (sym->visible == no && !conf_unsaved)
572 sym->flags &= ~SYMBOL_DEF_USER;
573 switch (sym->type) {
574 case S_STRING:
575 case S_INT:
576 case S_HEX:
577 /* Reset a string value if it's out of range */
578 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
579 break;
580 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
581 conf_unsaved++;
582 break;
583 default:
584 break;
585 }
586 }
587 }
588
589 if (conf_warnings || conf_unsaved)
590 conf_set_changed(true);
591
592 return 0;
593}
594
595struct comment_style {
596 const char *decoration;
597 const char *prefix;
598 const char *postfix;
599};
600
601static const struct comment_style comment_style_pound = {
602 .decoration = "#",
603 .prefix = "#",
604 .postfix = "#",
605};
606
607static const struct comment_style comment_style_c = {
608 .decoration = " *",
609 .prefix = "/*",
610 .postfix = " */",
611};
612
613static void conf_write_heading(FILE *fp, const struct comment_style *cs)
614{
615 if (!cs)
616 return;
617
618 fprintf(fp, "%s\n", cs->prefix);
619
620 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
621 cs->decoration);
622
623 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
624
625 fprintf(fp, "%s\n", cs->postfix);
626}
627
628/* The returned pointer must be freed on the caller side */
629static char *escape_string_value(const char *in)
630{
631 const char *p;
632 char *out;
633 size_t len;
634
635 len = strlen(in) + strlen("\"\"") + 1;
636
637 p = in;
638 while (1) {
639 p += strcspn(p, "\"\\");
640
641 if (p[0] == '\0')
642 break;
643
644 len++;
645 p++;
646 }
647
648 out = xmalloc(len);
649 out[0] = '\0';
650
651 strcat(out, "\"");
652
653 p = in;
654 while (1) {
655 len = strcspn(p, "\"\\");
656 strncat(out, p, len);
657 p += len;
658
659 if (p[0] == '\0')
660 break;
661
662 strcat(out, "\\");
663 strncat(out, p++, 1);
664 }
665
666 strcat(out, "\"");
667
668 return out;
669}
670
671enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
672
673static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
674 bool escape_string)
675{
676 const char *val;
677 char *escaped = NULL;
678
679 if (sym->type == S_UNKNOWN)
680 return;
681
682 val = sym_get_string_value(sym);
683
684 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
685 output_n != OUTPUT_N && *val == 'n') {
686 if (output_n == OUTPUT_N_AS_UNSET)
687 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
688 return;
689 }
690
691 if (sym->type == S_STRING && escape_string) {
692 escaped = escape_string_value(val);
693 val = escaped;
694 }
695
696 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
697
698 free(escaped);
699}
700
701static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
702{
703 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
704}
705
706static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
707{
708 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
709}
710
711void print_symbol_for_listconfig(struct symbol *sym)
712{
713 __print_symbol(stdout, sym, OUTPUT_N, true);
714}
715
716static void print_symbol_for_c(FILE *fp, struct symbol *sym)
717{
718 const char *val;
719 const char *sym_suffix = "";
720 const char *val_prefix = "";
721 char *escaped = NULL;
722
723 if (sym->type == S_UNKNOWN)
724 return;
725
726 val = sym_get_string_value(sym);
727
728 switch (sym->type) {
729 case S_BOOLEAN:
730 case S_TRISTATE:
731 switch (*val) {
732 case 'n':
733 return;
734 case 'm':
735 sym_suffix = "_MODULE";
736 /* fall through */
737 default:
738 val = "1";
739 }
740 break;
741 case S_HEX:
742 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
743 val_prefix = "0x";
744 break;
745 case S_STRING:
746 escaped = escape_string_value(val);
747 val = escaped;
748 default:
749 break;
750 }
751
752 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
753 val_prefix, val);
754
755 free(escaped);
756}
757
758static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
759{
760 const char *val;
761 const char *val_prefix = "";
762 char *val_prefixed = NULL;
763 size_t val_prefixed_len;
764 char *escaped = NULL;
765
766 if (sym->type == S_UNKNOWN)
767 return;
768
769 val = sym_get_string_value(sym);
770
771 switch (sym->type) {
772 case S_BOOLEAN:
773 case S_TRISTATE:
774 /*
775 * We do not care about disabled ones, i.e. no need for
776 * what otherwise are "comments" in other printers.
777 */
778 if (*val == 'n')
779 return;
780
781 /*
782 * To have similar functionality to the C macro `IS_ENABLED()`
783 * we provide an empty `--cfg CONFIG_X` here in both `y`
784 * and `m` cases.
785 *
786 * Then, the common `fprintf()` below will also give us
787 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
788 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
789 */
790 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
791 break;
792 case S_HEX:
793 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
794 val_prefix = "0x";
795 break;
796 default:
797 break;
798 }
799
800 if (strlen(val_prefix) > 0) {
801 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
802 val_prefixed = xmalloc(val_prefixed_len);
803 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
804 val = val_prefixed;
805 }
806
807 /* All values get escaped: the `--cfg` option only takes strings */
808 escaped = escape_string_value(val);
809 val = escaped;
810
811 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
812
813 free(escaped);
814 free(val_prefixed);
815}
816
817/*
818 * Write out a minimal config.
819 * All values that has default values are skipped as this is redundant.
820 */
821int conf_write_defconfig(const char *filename)
822{
823 struct symbol *sym;
824 struct menu *menu;
825 FILE *out;
826
827 out = fopen(filename, "w");
828 if (!out)
829 return 1;
830
831 sym_clear_all_valid();
832
833 /* Traverse all menus to find all relevant symbols */
834 menu = rootmenu.list;
835
836 while (menu != NULL)
837 {
838 sym = menu->sym;
839 if (sym == NULL) {
840 if (!menu_is_visible(menu))
841 goto next_menu;
842 } else if (!sym_is_choice(sym)) {
843 sym_calc_value(sym);
844 if (!(sym->flags & SYMBOL_WRITE))
845 goto next_menu;
846 sym->flags &= ~SYMBOL_WRITE;
847 /* If we cannot change the symbol - skip */
848 if (!sym_is_changeable(sym))
849 goto next_menu;
850 /* If symbol equals to default value - skip */
851 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
852 goto next_menu;
853
854 /*
855 * If symbol is a choice value and equals to the
856 * default for a choice - skip.
857 * But only if value is bool and equal to "y" and
858 * choice is not "optional".
859 * (If choice is "optional" then all values can be "n")
860 */
861 if (sym_is_choice_value(sym)) {
862 struct symbol *cs;
863 struct symbol *ds;
864
865 cs = prop_get_symbol(sym_get_choice_prop(sym));
866 ds = sym_choice_default(cs);
867 if (!sym_is_optional(cs) && sym == ds) {
868 if ((sym->type == S_BOOLEAN) &&
869 sym_get_tristate_value(sym) == yes)
870 goto next_menu;
871 }
872 }
873 print_symbol_for_dotconfig(out, sym);
874 }
875next_menu:
876 if (menu->list != NULL) {
877 menu = menu->list;
878 }
879 else if (menu->next != NULL) {
880 menu = menu->next;
881 } else {
882 while ((menu = menu->parent)) {
883 if (menu->next != NULL) {
884 menu = menu->next;
885 break;
886 }
887 }
888 }
889 }
890 fclose(out);
891 return 0;
892}
893
894int conf_write(const char *name)
895{
896 FILE *out;
897 struct symbol *sym;
898 struct menu *menu;
899 const char *str;
900 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
901 char *env;
902 int i;
903 bool need_newline = false;
904
905 if (!name)
906 name = conf_get_configname();
907
908 if (!*name) {
909 fprintf(stderr, "config name is empty\n");
910 return -1;
911 }
912
913 if (is_dir(name)) {
914 fprintf(stderr, "%s: Is a directory\n", name);
915 return -1;
916 }
917
918 if (make_parent_dir(name))
919 return -1;
920
921 env = getenv("KCONFIG_OVERWRITECONFIG");
922 if (env && *env) {
923 *tmpname = 0;
924 out = fopen(name, "w");
925 } else {
926 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
927 name, (int)getpid());
928 out = fopen(tmpname, "w");
929 }
930 if (!out)
931 return 1;
932
933 conf_write_heading(out, &comment_style_pound);
934
935 if (!conf_get_changed())
936 sym_clear_all_valid();
937
938 menu = rootmenu.list;
939 while (menu) {
940 sym = menu->sym;
941 if (!sym) {
942 if (!menu_is_visible(menu))
943 goto next;
944 str = menu_get_prompt(menu);
945 fprintf(out, "\n"
946 "#\n"
947 "# %s\n"
948 "#\n", str);
949 need_newline = false;
950 } else if (!(sym->flags & SYMBOL_CHOICE) &&
951 !(sym->flags & SYMBOL_WRITTEN)) {
952 sym_calc_value(sym);
953 if (!(sym->flags & SYMBOL_WRITE))
954 goto next;
955 if (need_newline) {
956 fprintf(out, "\n");
957 need_newline = false;
958 }
959 sym->flags |= SYMBOL_WRITTEN;
960 print_symbol_for_dotconfig(out, sym);
961 }
962
963next:
964 if (menu->list) {
965 menu = menu->list;
966 continue;
967 }
968
969end_check:
970 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
971 menu->prompt->type == P_MENU) {
972 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
973 need_newline = true;
974 }
975
976 if (menu->next) {
977 menu = menu->next;
978 } else {
979 menu = menu->parent;
980 if (menu)
981 goto end_check;
982 }
983 }
984 fclose(out);
985
986 for_all_symbols(i, sym)
987 sym->flags &= ~SYMBOL_WRITTEN;
988
989 if (*tmpname) {
990 if (is_same(name, tmpname)) {
991 conf_message("No change to %s", name);
992 unlink(tmpname);
993 conf_set_changed(false);
994 return 0;
995 }
996
997 snprintf(oldname, sizeof(oldname), "%s.old", name);
998 rename(name, oldname);
999 if (rename(tmpname, name))
1000 return 1;
1001 }
1002
1003 conf_message("configuration written to %s", name);
1004
1005 conf_set_changed(false);
1006
1007 return 0;
1008}
1009
1010/* write a dependency file as used by kbuild to track dependencies */
1011static int conf_write_autoconf_cmd(const char *autoconf_name)
1012{
1013 char name[PATH_MAX], tmp[PATH_MAX];
1014 struct file *file;
1015 FILE *out;
1016 int ret;
1017
1018 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
1019 if (ret >= sizeof(name)) /* check truncation */
1020 return -1;
1021
1022 if (make_parent_dir(name))
1023 return -1;
1024
1025 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
1026 if (ret >= sizeof(tmp)) /* check truncation */
1027 return -1;
1028
1029 out = fopen(tmp, "w");
1030 if (!out) {
1031 perror("fopen");
1032 return -1;
1033 }
1034
1035 fprintf(out, "deps_config := \\\n");
1036 for (file = file_list; file; file = file->next)
1037 fprintf(out, "\t%s \\\n", file->name);
1038
1039 fprintf(out, "\n%s: $(deps_config)\n\n", autoconf_name);
1040
1041 env_write_dep(out, autoconf_name);
1042
1043 fprintf(out, "\n$(deps_config): ;\n");
1044
1045 fflush(out);
1046 ret = ferror(out); /* error check for all fprintf() calls */
1047 fclose(out);
1048 if (ret)
1049 return -1;
1050
1051 if (rename(tmp, name)) {
1052 perror("rename");
1053 return -1;
1054 }
1055
1056 return 0;
1057}
1058
1059static int conf_touch_deps(void)
1060{
1061 const char *name, *tmp;
1062 struct symbol *sym;
1063 int res, i;
1064
1065 name = conf_get_autoconfig_name();
1066 tmp = strrchr(name, '/');
1067 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
1068 if (depfile_prefix_len + 1 > sizeof(depfile_path))
1069 return -1;
1070
1071 strncpy(depfile_path, name, depfile_prefix_len);
1072 depfile_path[depfile_prefix_len] = 0;
1073
1074 conf_read_simple(name, S_DEF_AUTO);
1075 sym_calc_value(modules_sym);
1076
1077 for_all_symbols(i, sym) {
1078 sym_calc_value(sym);
1079 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1080 continue;
1081 if (sym->flags & SYMBOL_WRITE) {
1082 if (sym->flags & SYMBOL_DEF_AUTO) {
1083 /*
1084 * symbol has old and new value,
1085 * so compare them...
1086 */
1087 switch (sym->type) {
1088 case S_BOOLEAN:
1089 case S_TRISTATE:
1090 if (sym_get_tristate_value(sym) ==
1091 sym->def[S_DEF_AUTO].tri)
1092 continue;
1093 break;
1094 case S_STRING:
1095 case S_HEX:
1096 case S_INT:
1097 if (!strcmp(sym_get_string_value(sym),
1098 sym->def[S_DEF_AUTO].val))
1099 continue;
1100 break;
1101 default:
1102 break;
1103 }
1104 } else {
1105 /*
1106 * If there is no old value, only 'no' (unset)
1107 * is allowed as new value.
1108 */
1109 switch (sym->type) {
1110 case S_BOOLEAN:
1111 case S_TRISTATE:
1112 if (sym_get_tristate_value(sym) == no)
1113 continue;
1114 break;
1115 default:
1116 break;
1117 }
1118 }
1119 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1120 /* There is neither an old nor a new value. */
1121 continue;
1122 /* else
1123 * There is an old value, but no new value ('no' (unset)
1124 * isn't saved in auto.conf, so the old value is always
1125 * different from 'no').
1126 */
1127
1128 res = conf_touch_dep(sym->name);
1129 if (res)
1130 return res;
1131 }
1132
1133 return 0;
1134}
1135
1136static int __conf_write_autoconf(const char *filename,
1137 void (*print_symbol)(FILE *, struct symbol *),
1138 const struct comment_style *comment_style)
1139{
1140 char tmp[PATH_MAX];
1141 FILE *file;
1142 struct symbol *sym;
1143 int ret, i;
1144
1145 if (make_parent_dir(filename))
1146 return -1;
1147
1148 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1149 if (ret >= sizeof(tmp)) /* check truncation */
1150 return -1;
1151
1152 file = fopen(tmp, "w");
1153 if (!file) {
1154 perror("fopen");
1155 return -1;
1156 }
1157
1158 conf_write_heading(file, comment_style);
1159
1160 for_all_symbols(i, sym)
1161 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1162 print_symbol(file, sym);
1163
1164 fflush(file);
1165 /* check possible errors in conf_write_heading() and print_symbol() */
1166 ret = ferror(file);
1167 fclose(file);
1168 if (ret)
1169 return -1;
1170
1171 if (rename(tmp, filename)) {
1172 perror("rename");
1173 return -1;
1174 }
1175
1176 return 0;
1177}
1178
1179int conf_write_autoconf(int overwrite)
1180{
1181 struct symbol *sym;
1182 const char *autoconf_name = conf_get_autoconfig_name();
1183 int ret, i;
1184
1185 if (!overwrite && is_present(autoconf_name))
1186 return 0;
1187
1188 ret = conf_write_autoconf_cmd(autoconf_name);
1189 if (ret)
1190 return -1;
1191
1192 if (conf_touch_deps())
1193 return 1;
1194
1195 for_all_symbols(i, sym)
1196 sym_calc_value(sym);
1197
1198 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1199 print_symbol_for_c,
1200 &comment_style_c);
1201 if (ret)
1202 return ret;
1203
1204 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1205 print_symbol_for_rustccfg,
1206 NULL);
1207 if (ret)
1208 return ret;
1209
1210 /*
1211 * Create include/config/auto.conf. This must be the last step because
1212 * Kbuild has a dependency on auto.conf and this marks the successful
1213 * completion of the previous steps.
1214 */
1215 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1216 print_symbol_for_autoconf,
1217 &comment_style_pound);
1218 if (ret)
1219 return ret;
1220
1221 return 0;
1222}
1223
1224static bool conf_changed;
1225static void (*conf_changed_callback)(void);
1226
1227void conf_set_changed(bool val)
1228{
1229 if (conf_changed_callback && conf_changed != val)
1230 conf_changed_callback();
1231
1232 conf_changed = val;
1233}
1234
1235bool conf_get_changed(void)
1236{
1237 return conf_changed;
1238}
1239
1240void conf_set_changed_callback(void (*fn)(void))
1241{
1242 conf_changed_callback = fn;
1243}
1244
1245void set_all_choice_values(struct symbol *csym)
1246{
1247 struct property *prop;
1248 struct symbol *sym;
1249 struct expr *e;
1250
1251 prop = sym_get_choice_prop(csym);
1252
1253 /*
1254 * Set all non-assinged choice values to no
1255 */
1256 expr_list_for_each_sym(prop->expr, e, sym) {
1257 if (!sym_has_value(sym))
1258 sym->def[S_DEF_USER].tri = no;
1259 }
1260 csym->flags |= SYMBOL_DEF_USER;
1261 /* clear VALID to get value calculated */
1262 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1263}
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}