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 */
is_present(const char * path)24 static 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 */
is_dir(const char * path)32 static 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 */
is_same(const char * file1,const char * file2)43 static 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;
80 close2:
81 close(fd2);
82 close1:
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 */
make_parent_dir(const char * path)93 static 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
127 static char depfile_path[PATH_MAX];
128 static size_t depfile_prefix_len;
129
130 /* touch depfile for symbol 'name' */
conf_touch_dep(const char * name)131 static 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
149 static void conf_warning(const char *fmt, ...)
150 __attribute__ ((format (printf, 1, 2)));
151
152 static void conf_message(const char *fmt, ...)
153 __attribute__ ((format (printf, 1, 2)));
154
155 static const char *conf_filename;
156 static int conf_lineno, conf_warnings;
157
conf_errors(void)158 bool conf_errors(void)
159 {
160 if (conf_warnings)
161 return getenv("KCONFIG_WERROR");
162 return false;
163 }
164
conf_warning(const char * fmt,...)165 static void conf_warning(const char *fmt, ...)
166 {
167 va_list ap;
168 va_start(ap, fmt);
169 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
170 vfprintf(stderr, fmt, ap);
171 fprintf(stderr, "\n");
172 va_end(ap);
173 conf_warnings++;
174 }
175
conf_default_message_callback(const char * s)176 static void conf_default_message_callback(const char *s)
177 {
178 printf("#\n# ");
179 printf("%s", s);
180 printf("\n#\n");
181 }
182
183 static void (*conf_message_callback)(const char *s) =
184 conf_default_message_callback;
conf_set_message_callback(void (* fn)(const char * s))185 void conf_set_message_callback(void (*fn)(const char *s))
186 {
187 conf_message_callback = fn;
188 }
189
conf_message(const char * fmt,...)190 static void conf_message(const char *fmt, ...)
191 {
192 va_list ap;
193 char buf[4096];
194
195 if (!conf_message_callback)
196 return;
197
198 va_start(ap, fmt);
199
200 vsnprintf(buf, sizeof(buf), fmt, ap);
201 conf_message_callback(buf);
202 va_end(ap);
203 }
204
conf_get_configname(void)205 const char *conf_get_configname(void)
206 {
207 char *name = getenv("KCONFIG_CONFIG");
208
209 return name ? name : ".config";
210 }
211
conf_get_autoconfig_name(void)212 static const char *conf_get_autoconfig_name(void)
213 {
214 char *name = getenv("KCONFIG_AUTOCONFIG");
215
216 return name ? name : "include/config/auto.conf";
217 }
218
conf_get_autoheader_name(void)219 static const char *conf_get_autoheader_name(void)
220 {
221 char *name = getenv("KCONFIG_AUTOHEADER");
222
223 return name ? name : "include/generated/autoconf.h";
224 }
225
conf_get_rustccfg_name(void)226 static const char *conf_get_rustccfg_name(void)
227 {
228 char *name = getenv("KCONFIG_RUSTCCFG");
229
230 return name ? name : "include/generated/rustc_cfg";
231 }
232
conf_set_sym_val(struct symbol * sym,int def,int def_flags,char * p)233 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
234 {
235 char *p2;
236
237 switch (sym->type) {
238 case S_TRISTATE:
239 if (p[0] == 'm') {
240 sym->def[def].tri = mod;
241 sym->flags |= def_flags;
242 break;
243 }
244 /* fall through */
245 case S_BOOLEAN:
246 if (p[0] == 'y') {
247 sym->def[def].tri = yes;
248 sym->flags |= def_flags;
249 break;
250 }
251 if (p[0] == 'n') {
252 sym->def[def].tri = no;
253 sym->flags |= def_flags;
254 break;
255 }
256 if (def != S_DEF_AUTO)
257 conf_warning("symbol value '%s' invalid for %s",
258 p, sym->name);
259 return 1;
260 case S_STRING:
261 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
262 if (def != S_DEF_AUTO) {
263 if (*p++ != '"')
264 break;
265 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
266 if (*p2 == '"') {
267 *p2 = 0;
268 break;
269 }
270 memmove(p2, p2 + 1, strlen(p2));
271 }
272 if (!p2) {
273 conf_warning("invalid string found");
274 return 1;
275 }
276 }
277 /* fall through */
278 case S_INT:
279 case S_HEX:
280 if (sym_string_valid(sym, p)) {
281 sym->def[def].val = xstrdup(p);
282 sym->flags |= def_flags;
283 } else {
284 if (def != S_DEF_AUTO)
285 conf_warning("symbol value '%s' invalid for %s",
286 p, sym->name);
287 return 1;
288 }
289 break;
290 default:
291 ;
292 }
293 return 0;
294 }
295
296 #define LINE_GROWTH 16
add_byte(int c,char ** lineptr,size_t slen,size_t * n)297 static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
298 {
299 size_t new_size = slen + 1;
300
301 if (new_size > *n) {
302 new_size += LINE_GROWTH - 1;
303 new_size *= 2;
304 *lineptr = xrealloc(*lineptr, new_size);
305 *n = new_size;
306 }
307
308 (*lineptr)[slen] = c;
309
310 return 0;
311 }
312
compat_getline(char ** lineptr,size_t * n,FILE * stream)313 static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
314 {
315 char *line = *lineptr;
316 size_t slen = 0;
317
318 for (;;) {
319 int c = getc(stream);
320
321 switch (c) {
322 case '\n':
323 if (add_byte(c, &line, slen, n) < 0)
324 goto e_out;
325 slen++;
326 /* fall through */
327 case EOF:
328 if (add_byte('\0', &line, slen, n) < 0)
329 goto e_out;
330 *lineptr = line;
331 if (slen == 0)
332 return -1;
333 return slen;
334 default:
335 if (add_byte(c, &line, slen, n) < 0)
336 goto e_out;
337 slen++;
338 }
339 }
340
341 e_out:
342 line[slen-1] = '\0';
343 *lineptr = line;
344 return -1;
345 }
346
347 /* like getline(), but the newline character is stripped away */
getline_stripped(char ** lineptr,size_t * n,FILE * stream)348 static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
349 {
350 ssize_t len;
351
352 len = compat_getline(lineptr, n, stream);
353
354 if (len > 0 && (*lineptr)[len - 1] == '\n') {
355 len--;
356 (*lineptr)[len] = '\0';
357
358 if (len > 0 && (*lineptr)[len - 1] == '\r') {
359 len--;
360 (*lineptr)[len] = '\0';
361 }
362 }
363
364 return len;
365 }
366
conf_read_simple(const char * name,int def)367 int conf_read_simple(const char *name, int def)
368 {
369 FILE *in = NULL;
370 char *line = NULL;
371 size_t line_asize = 0;
372 char *p, *val;
373 struct symbol *sym;
374 int i, def_flags;
375 const char *warn_unknown, *sym_name;
376
377 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
378 if (name) {
379 in = zconf_fopen(name);
380 } else {
381 char *env;
382
383 name = conf_get_configname();
384 in = zconf_fopen(name);
385 if (in)
386 goto load;
387 conf_set_changed(true);
388
389 env = getenv("KCONFIG_DEFCONFIG_LIST");
390 if (!env)
391 return 1;
392
393 while (1) {
394 bool is_last;
395
396 while (isspace(*env))
397 env++;
398
399 if (!*env)
400 break;
401
402 p = env;
403 while (*p && !isspace(*p))
404 p++;
405
406 is_last = (*p == '\0');
407
408 *p = '\0';
409
410 in = zconf_fopen(env);
411 if (in) {
412 conf_message("using defaults found in %s",
413 env);
414 goto load;
415 }
416
417 if (is_last)
418 break;
419
420 env = p + 1;
421 }
422 }
423 if (!in)
424 return 1;
425
426 load:
427 conf_filename = name;
428 conf_lineno = 0;
429 conf_warnings = 0;
430
431 def_flags = SYMBOL_DEF << def;
432 for_all_symbols(i, sym) {
433 sym->flags |= SYMBOL_CHANGED;
434 sym->flags &= ~(def_flags|SYMBOL_VALID);
435 if (sym_is_choice(sym))
436 sym->flags |= def_flags;
437 switch (sym->type) {
438 case S_INT:
439 case S_HEX:
440 case S_STRING:
441 free(sym->def[def].val);
442 /* fall through */
443 default:
444 sym->def[def].val = NULL;
445 sym->def[def].tri = no;
446 }
447 }
448
449 while (getline_stripped(&line, &line_asize, in) != -1) {
450 conf_lineno++;
451
452 if (!line[0]) /* blank line */
453 continue;
454
455 if (line[0] == '#') {
456 if (line[1] != ' ')
457 continue;
458 p = line + 2;
459 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
460 continue;
461 sym_name = p + strlen(CONFIG_);
462 p = strchr(sym_name, ' ');
463 if (!p)
464 continue;
465 *p++ = 0;
466 if (strcmp(p, "is not set"))
467 continue;
468
469 val = "n";
470 } else {
471 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
472 conf_warning("unexpected data: %s", line);
473 continue;
474 }
475
476 sym_name = line + strlen(CONFIG_);
477 p = strchr(sym_name, '=');
478 if (!p) {
479 conf_warning("unexpected data: %s", line);
480 continue;
481 }
482 *p = 0;
483 val = p + 1;
484 }
485
486 sym = sym_find(sym_name);
487 if (!sym) {
488 if (def == S_DEF_AUTO) {
489 /*
490 * Reading from include/config/auto.conf.
491 * If CONFIG_FOO previously existed in auto.conf
492 * but it is missing now, include/config/FOO
493 * must be touched.
494 */
495 conf_touch_dep(sym_name);
496 } else {
497 if (warn_unknown)
498 conf_warning("unknown symbol: %s", sym_name);
499
500 conf_set_changed(true);
501 }
502 continue;
503 }
504
505 if (sym->flags & def_flags)
506 conf_warning("override: reassigning to symbol %s", sym->name);
507
508 if (conf_set_sym_val(sym, def, def_flags, val))
509 continue;
510
511 if (sym && sym_is_choice_value(sym)) {
512 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
513 switch (sym->def[def].tri) {
514 case no:
515 break;
516 case mod:
517 if (cs->def[def].tri == yes) {
518 conf_warning("%s creates inconsistent choice state", sym->name);
519 cs->flags &= ~def_flags;
520 }
521 break;
522 case yes:
523 if (cs->def[def].tri != no)
524 conf_warning("override: %s changes choice state", sym->name);
525 cs->def[def].val = sym;
526 break;
527 }
528 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
529 }
530 }
531 free(line);
532 fclose(in);
533
534 return 0;
535 }
536
conf_read(const char * name)537 int conf_read(const char *name)
538 {
539 struct symbol *sym;
540 int conf_unsaved = 0;
541 int i;
542
543 conf_set_changed(false);
544
545 if (conf_read_simple(name, S_DEF_USER)) {
546 sym_calc_value(modules_sym);
547 return 1;
548 }
549
550 sym_calc_value(modules_sym);
551
552 for_all_symbols(i, sym) {
553 sym_calc_value(sym);
554 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
555 continue;
556 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
557 /* check that calculated value agrees with saved value */
558 switch (sym->type) {
559 case S_BOOLEAN:
560 case S_TRISTATE:
561 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
562 continue;
563 break;
564 default:
565 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
566 continue;
567 break;
568 }
569 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
570 /* no previous value and not saved */
571 continue;
572 conf_unsaved++;
573 /* maybe print value in verbose mode... */
574 }
575
576 for_all_symbols(i, sym) {
577 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
578 /* Reset values of generates values, so they'll appear
579 * as new, if they should become visible, but that
580 * doesn't quite work if the Kconfig and the saved
581 * configuration disagree.
582 */
583 if (sym->visible == no && !conf_unsaved)
584 sym->flags &= ~SYMBOL_DEF_USER;
585 switch (sym->type) {
586 case S_STRING:
587 case S_INT:
588 case S_HEX:
589 /* Reset a string value if it's out of range */
590 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
591 break;
592 sym->flags &= ~SYMBOL_VALID;
593 conf_unsaved++;
594 break;
595 default:
596 break;
597 }
598 }
599 }
600
601 if (conf_warnings || conf_unsaved)
602 conf_set_changed(true);
603
604 return 0;
605 }
606
607 struct comment_style {
608 const char *decoration;
609 const char *prefix;
610 const char *postfix;
611 };
612
613 static const struct comment_style comment_style_pound = {
614 .decoration = "#",
615 .prefix = "#",
616 .postfix = "#",
617 };
618
619 static const struct comment_style comment_style_c = {
620 .decoration = " *",
621 .prefix = "/*",
622 .postfix = " */",
623 };
624
conf_write_heading(FILE * fp,const struct comment_style * cs)625 static void conf_write_heading(FILE *fp, const struct comment_style *cs)
626 {
627 if (!cs)
628 return;
629
630 fprintf(fp, "%s\n", cs->prefix);
631
632 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
633 cs->decoration);
634
635 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
636
637 fprintf(fp, "%s\n", cs->postfix);
638 }
639
640 /* The returned pointer must be freed on the caller side */
escape_string_value(const char * in)641 static char *escape_string_value(const char *in)
642 {
643 const char *p;
644 char *out;
645 size_t len;
646
647 len = strlen(in) + strlen("\"\"") + 1;
648
649 p = in;
650 while (1) {
651 p += strcspn(p, "\"\\");
652
653 if (p[0] == '\0')
654 break;
655
656 len++;
657 p++;
658 }
659
660 out = xmalloc(len);
661 out[0] = '\0';
662
663 strcat(out, "\"");
664
665 p = in;
666 while (1) {
667 len = strcspn(p, "\"\\");
668 strncat(out, p, len);
669 p += len;
670
671 if (p[0] == '\0')
672 break;
673
674 strcat(out, "\\");
675 strncat(out, p++, 1);
676 }
677
678 strcat(out, "\"");
679
680 return out;
681 }
682
683 enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
684
__print_symbol(FILE * fp,struct symbol * sym,enum output_n output_n,bool escape_string)685 static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
686 bool escape_string)
687 {
688 const char *val;
689 char *escaped = NULL;
690
691 if (sym->type == S_UNKNOWN)
692 return;
693
694 val = sym_get_string_value(sym);
695
696 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
697 output_n != OUTPUT_N && *val == 'n') {
698 if (output_n == OUTPUT_N_AS_UNSET)
699 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
700 return;
701 }
702
703 if (sym->type == S_STRING && escape_string) {
704 escaped = escape_string_value(val);
705 val = escaped;
706 }
707
708 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
709
710 free(escaped);
711 }
712
print_symbol_for_dotconfig(FILE * fp,struct symbol * sym)713 static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
714 {
715 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
716 }
717
print_symbol_for_autoconf(FILE * fp,struct symbol * sym)718 static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
719 {
720 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
721 }
722
print_symbol_for_listconfig(struct symbol * sym)723 void print_symbol_for_listconfig(struct symbol *sym)
724 {
725 __print_symbol(stdout, sym, OUTPUT_N, true);
726 }
727
print_symbol_for_c(FILE * fp,struct symbol * sym)728 static void print_symbol_for_c(FILE *fp, struct symbol *sym)
729 {
730 const char *val;
731 const char *sym_suffix = "";
732 const char *val_prefix = "";
733 char *escaped = NULL;
734
735 if (sym->type == S_UNKNOWN)
736 return;
737
738 val = sym_get_string_value(sym);
739
740 switch (sym->type) {
741 case S_BOOLEAN:
742 case S_TRISTATE:
743 switch (*val) {
744 case 'n':
745 return;
746 case 'm':
747 sym_suffix = "_MODULE";
748 /* fall through */
749 default:
750 val = "1";
751 }
752 break;
753 case S_HEX:
754 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
755 val_prefix = "0x";
756 break;
757 case S_STRING:
758 escaped = escape_string_value(val);
759 val = escaped;
760 default:
761 break;
762 }
763
764 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
765 val_prefix, val);
766
767 free(escaped);
768 }
769
print_symbol_for_rustccfg(FILE * fp,struct symbol * sym)770 static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
771 {
772 const char *val;
773 const char *val_prefix = "";
774 char *val_prefixed = NULL;
775 size_t val_prefixed_len;
776 char *escaped = NULL;
777
778 if (sym->type == S_UNKNOWN)
779 return;
780
781 val = sym_get_string_value(sym);
782
783 switch (sym->type) {
784 case S_BOOLEAN:
785 case S_TRISTATE:
786 /*
787 * We do not care about disabled ones, i.e. no need for
788 * what otherwise are "comments" in other printers.
789 */
790 if (*val == 'n')
791 return;
792
793 /*
794 * To have similar functionality to the C macro `IS_ENABLED()`
795 * we provide an empty `--cfg CONFIG_X` here in both `y`
796 * and `m` cases.
797 *
798 * Then, the common `fprintf()` below will also give us
799 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
800 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
801 */
802 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
803 break;
804 case S_HEX:
805 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
806 val_prefix = "0x";
807 break;
808 default:
809 break;
810 }
811
812 if (strlen(val_prefix) > 0) {
813 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
814 val_prefixed = xmalloc(val_prefixed_len);
815 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
816 val = val_prefixed;
817 }
818
819 /* All values get escaped: the `--cfg` option only takes strings */
820 escaped = escape_string_value(val);
821 val = escaped;
822
823 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
824
825 free(escaped);
826 free(val_prefixed);
827 }
828
829 /*
830 * Write out a minimal config.
831 * All values that has default values are skipped as this is redundant.
832 */
conf_write_defconfig(const char * filename)833 int conf_write_defconfig(const char *filename)
834 {
835 struct symbol *sym;
836 struct menu *menu;
837 FILE *out;
838
839 out = fopen(filename, "w");
840 if (!out)
841 return 1;
842
843 sym_clear_all_valid();
844
845 /* Traverse all menus to find all relevant symbols */
846 menu = rootmenu.list;
847
848 while (menu != NULL)
849 {
850 sym = menu->sym;
851 if (sym == NULL) {
852 if (!menu_is_visible(menu))
853 goto next_menu;
854 } else if (!sym_is_choice(sym)) {
855 sym_calc_value(sym);
856 if (!(sym->flags & SYMBOL_WRITE))
857 goto next_menu;
858 sym->flags &= ~SYMBOL_WRITE;
859 /* If we cannot change the symbol - skip */
860 if (!sym_is_changeable(sym))
861 goto next_menu;
862 /* If symbol equals to default value - skip */
863 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
864 goto next_menu;
865
866 /*
867 * If symbol is a choice value and equals to the
868 * default for a choice - skip.
869 * But only if value is bool and equal to "y" and
870 * choice is not "optional".
871 * (If choice is "optional" then all values can be "n")
872 */
873 if (sym_is_choice_value(sym)) {
874 struct symbol *cs;
875 struct symbol *ds;
876
877 cs = prop_get_symbol(sym_get_choice_prop(sym));
878 ds = sym_choice_default(cs);
879 if (!sym_is_optional(cs) && sym == ds) {
880 if ((sym->type == S_BOOLEAN) &&
881 sym_get_tristate_value(sym) == yes)
882 goto next_menu;
883 }
884 }
885 print_symbol_for_dotconfig(out, sym);
886 }
887 next_menu:
888 if (menu->list != NULL) {
889 menu = menu->list;
890 }
891 else if (menu->next != NULL) {
892 menu = menu->next;
893 } else {
894 while ((menu = menu->parent)) {
895 if (menu->next != NULL) {
896 menu = menu->next;
897 break;
898 }
899 }
900 }
901 }
902 fclose(out);
903 return 0;
904 }
905
conf_write(const char * name)906 int conf_write(const char *name)
907 {
908 FILE *out;
909 struct symbol *sym;
910 struct menu *menu;
911 const char *str;
912 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
913 char *env;
914 int i;
915 bool need_newline = false;
916
917 if (!name)
918 name = conf_get_configname();
919
920 if (!*name) {
921 fprintf(stderr, "config name is empty\n");
922 return -1;
923 }
924
925 if (is_dir(name)) {
926 fprintf(stderr, "%s: Is a directory\n", name);
927 return -1;
928 }
929
930 if (make_parent_dir(name))
931 return -1;
932
933 env = getenv("KCONFIG_OVERWRITECONFIG");
934 if (env && *env) {
935 *tmpname = 0;
936 out = fopen(name, "w");
937 } else {
938 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
939 name, (int)getpid());
940 out = fopen(tmpname, "w");
941 }
942 if (!out)
943 return 1;
944
945 conf_write_heading(out, &comment_style_pound);
946
947 if (!conf_get_changed())
948 sym_clear_all_valid();
949
950 menu = rootmenu.list;
951 while (menu) {
952 sym = menu->sym;
953 if (!sym) {
954 if (!menu_is_visible(menu))
955 goto next;
956 str = menu_get_prompt(menu);
957 fprintf(out, "\n"
958 "#\n"
959 "# %s\n"
960 "#\n", str);
961 need_newline = false;
962 } else if (!(sym->flags & SYMBOL_CHOICE) &&
963 !(sym->flags & SYMBOL_WRITTEN)) {
964 sym_calc_value(sym);
965 if (!(sym->flags & SYMBOL_WRITE))
966 goto next;
967 if (need_newline) {
968 fprintf(out, "\n");
969 need_newline = false;
970 }
971 sym->flags |= SYMBOL_WRITTEN;
972 print_symbol_for_dotconfig(out, sym);
973 }
974
975 next:
976 if (menu->list) {
977 menu = menu->list;
978 continue;
979 }
980
981 end_check:
982 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
983 menu->prompt->type == P_MENU) {
984 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
985 need_newline = true;
986 }
987
988 if (menu->next) {
989 menu = menu->next;
990 } else {
991 menu = menu->parent;
992 if (menu)
993 goto end_check;
994 }
995 }
996 fclose(out);
997
998 for_all_symbols(i, sym)
999 sym->flags &= ~SYMBOL_WRITTEN;
1000
1001 if (*tmpname) {
1002 if (is_same(name, tmpname)) {
1003 conf_message("No change to %s", name);
1004 unlink(tmpname);
1005 conf_set_changed(false);
1006 return 0;
1007 }
1008
1009 snprintf(oldname, sizeof(oldname), "%s.old", name);
1010 rename(name, oldname);
1011 if (rename(tmpname, name))
1012 return 1;
1013 }
1014
1015 conf_message("configuration written to %s", name);
1016
1017 conf_set_changed(false);
1018
1019 return 0;
1020 }
1021
1022 /* write a dependency file as used by kbuild to track dependencies */
conf_write_autoconf_cmd(const char * autoconf_name)1023 static int conf_write_autoconf_cmd(const char *autoconf_name)
1024 {
1025 char name[PATH_MAX], tmp[PATH_MAX];
1026 struct file *file;
1027 FILE *out;
1028 int ret;
1029
1030 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
1031 if (ret >= sizeof(name)) /* check truncation */
1032 return -1;
1033
1034 if (make_parent_dir(name))
1035 return -1;
1036
1037 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
1038 if (ret >= sizeof(tmp)) /* check truncation */
1039 return -1;
1040
1041 out = fopen(tmp, "w");
1042 if (!out) {
1043 perror("fopen");
1044 return -1;
1045 }
1046
1047 fprintf(out, "deps_config := \\\n");
1048 for (file = file_list; file; file = file->next)
1049 fprintf(out, "\t%s \\\n", file->name);
1050
1051 fprintf(out, "\n%s: $(deps_config)\n\n", autoconf_name);
1052
1053 env_write_dep(out, autoconf_name);
1054
1055 fprintf(out, "\n$(deps_config): ;\n");
1056
1057 fflush(out);
1058 ret = ferror(out); /* error check for all fprintf() calls */
1059 fclose(out);
1060 if (ret)
1061 return -1;
1062
1063 if (rename(tmp, name)) {
1064 perror("rename");
1065 return -1;
1066 }
1067
1068 return 0;
1069 }
1070
conf_touch_deps(void)1071 static int conf_touch_deps(void)
1072 {
1073 const char *name, *tmp;
1074 struct symbol *sym;
1075 int res, i;
1076
1077 name = conf_get_autoconfig_name();
1078 tmp = strrchr(name, '/');
1079 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
1080 if (depfile_prefix_len + 1 > sizeof(depfile_path))
1081 return -1;
1082
1083 strncpy(depfile_path, name, depfile_prefix_len);
1084 depfile_path[depfile_prefix_len] = 0;
1085
1086 conf_read_simple(name, S_DEF_AUTO);
1087 sym_calc_value(modules_sym);
1088
1089 for_all_symbols(i, sym) {
1090 sym_calc_value(sym);
1091 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1092 continue;
1093 if (sym->flags & SYMBOL_WRITE) {
1094 if (sym->flags & SYMBOL_DEF_AUTO) {
1095 /*
1096 * symbol has old and new value,
1097 * so compare them...
1098 */
1099 switch (sym->type) {
1100 case S_BOOLEAN:
1101 case S_TRISTATE:
1102 if (sym_get_tristate_value(sym) ==
1103 sym->def[S_DEF_AUTO].tri)
1104 continue;
1105 break;
1106 case S_STRING:
1107 case S_HEX:
1108 case S_INT:
1109 if (!strcmp(sym_get_string_value(sym),
1110 sym->def[S_DEF_AUTO].val))
1111 continue;
1112 break;
1113 default:
1114 break;
1115 }
1116 } else {
1117 /*
1118 * If there is no old value, only 'no' (unset)
1119 * is allowed as new value.
1120 */
1121 switch (sym->type) {
1122 case S_BOOLEAN:
1123 case S_TRISTATE:
1124 if (sym_get_tristate_value(sym) == no)
1125 continue;
1126 break;
1127 default:
1128 break;
1129 }
1130 }
1131 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1132 /* There is neither an old nor a new value. */
1133 continue;
1134 /* else
1135 * There is an old value, but no new value ('no' (unset)
1136 * isn't saved in auto.conf, so the old value is always
1137 * different from 'no').
1138 */
1139
1140 res = conf_touch_dep(sym->name);
1141 if (res)
1142 return res;
1143 }
1144
1145 return 0;
1146 }
1147
__conf_write_autoconf(const char * filename,void (* print_symbol)(FILE *,struct symbol *),const struct comment_style * comment_style)1148 static int __conf_write_autoconf(const char *filename,
1149 void (*print_symbol)(FILE *, struct symbol *),
1150 const struct comment_style *comment_style)
1151 {
1152 char tmp[PATH_MAX];
1153 FILE *file;
1154 struct symbol *sym;
1155 int ret, i;
1156
1157 if (make_parent_dir(filename))
1158 return -1;
1159
1160 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1161 if (ret >= sizeof(tmp)) /* check truncation */
1162 return -1;
1163
1164 file = fopen(tmp, "w");
1165 if (!file) {
1166 perror("fopen");
1167 return -1;
1168 }
1169
1170 conf_write_heading(file, comment_style);
1171
1172 for_all_symbols(i, sym)
1173 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1174 print_symbol(file, sym);
1175
1176 fflush(file);
1177 /* check possible errors in conf_write_heading() and print_symbol() */
1178 ret = ferror(file);
1179 fclose(file);
1180 if (ret)
1181 return -1;
1182
1183 if (rename(tmp, filename)) {
1184 perror("rename");
1185 return -1;
1186 }
1187
1188 return 0;
1189 }
1190
conf_write_autoconf(int overwrite)1191 int conf_write_autoconf(int overwrite)
1192 {
1193 struct symbol *sym;
1194 const char *autoconf_name = conf_get_autoconfig_name();
1195 int ret, i;
1196
1197 if (!overwrite && is_present(autoconf_name))
1198 return 0;
1199
1200 ret = conf_write_autoconf_cmd(autoconf_name);
1201 if (ret)
1202 return -1;
1203
1204 if (conf_touch_deps())
1205 return 1;
1206
1207 for_all_symbols(i, sym)
1208 sym_calc_value(sym);
1209
1210 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1211 print_symbol_for_c,
1212 &comment_style_c);
1213 if (ret)
1214 return ret;
1215
1216 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1217 print_symbol_for_rustccfg,
1218 NULL);
1219 if (ret)
1220 return ret;
1221
1222 /*
1223 * Create include/config/auto.conf. This must be the last step because
1224 * Kbuild has a dependency on auto.conf and this marks the successful
1225 * completion of the previous steps.
1226 */
1227 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1228 print_symbol_for_autoconf,
1229 &comment_style_pound);
1230 if (ret)
1231 return ret;
1232
1233 return 0;
1234 }
1235
1236 static bool conf_changed;
1237 static void (*conf_changed_callback)(void);
1238
conf_set_changed(bool val)1239 void conf_set_changed(bool val)
1240 {
1241 bool changed = conf_changed != val;
1242
1243 conf_changed = val;
1244
1245 if (conf_changed_callback && changed)
1246 conf_changed_callback();
1247 }
1248
conf_get_changed(void)1249 bool conf_get_changed(void)
1250 {
1251 return conf_changed;
1252 }
1253
conf_set_changed_callback(void (* fn)(void))1254 void conf_set_changed_callback(void (*fn)(void))
1255 {
1256 conf_changed_callback = fn;
1257 }
1258
set_all_choice_values(struct symbol * csym)1259 void set_all_choice_values(struct symbol *csym)
1260 {
1261 struct property *prop;
1262 struct symbol *sym;
1263 struct expr *e;
1264
1265 prop = sym_get_choice_prop(csym);
1266
1267 /*
1268 * Set all non-assinged choice values to no
1269 */
1270 expr_list_for_each_sym(prop->expr, e, sym) {
1271 if (!sym_has_value(sym))
1272 sym->def[S_DEF_USER].tri = no;
1273 }
1274 csym->flags |= SYMBOL_DEF_USER;
1275 /* clear VALID to get value calculated */
1276 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1277 }
1278