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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 <stdio.h>
15#include <stdlib.h>
16#include <string.h>
17#include <time.h>
18#include <unistd.h>
19
20#include "lkc.h"
21
22/* return true if 'path' exists, false otherwise */
23static bool is_present(const char *path)
24{
25 struct stat st;
26
27 return !stat(path, &st);
28}
29
30/* return true if 'path' exists and it is a directory, false otherwise */
31static bool is_dir(const char *path)
32{
33 struct stat st;
34
35 if (stat(path, &st))
36 return false;
37
38 return S_ISDIR(st.st_mode);
39}
40
41/* return true if the given two files are the same, false otherwise */
42static bool is_same(const char *file1, const char *file2)
43{
44 int fd1, fd2;
45 struct stat st1, st2;
46 void *map1, *map2;
47 bool ret = false;
48
49 fd1 = open(file1, O_RDONLY);
50 if (fd1 < 0)
51 return ret;
52
53 fd2 = open(file2, O_RDONLY);
54 if (fd2 < 0)
55 goto close1;
56
57 ret = fstat(fd1, &st1);
58 if (ret)
59 goto close2;
60 ret = fstat(fd2, &st2);
61 if (ret)
62 goto close2;
63
64 if (st1.st_size != st2.st_size)
65 goto close2;
66
67 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
68 if (map1 == MAP_FAILED)
69 goto close2;
70
71 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
72 if (map2 == MAP_FAILED)
73 goto close2;
74
75 if (bcmp(map1, map2, st1.st_size))
76 goto close2;
77
78 ret = true;
79close2:
80 close(fd2);
81close1:
82 close(fd1);
83
84 return ret;
85}
86
87/*
88 * Create the parent directory of the given path.
89 *
90 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
91 */
92static int make_parent_dir(const char *path)
93{
94 char tmp[PATH_MAX + 1];
95 char *p;
96
97 strncpy(tmp, path, sizeof(tmp));
98 tmp[sizeof(tmp) - 1] = 0;
99
100 /* Remove the base name. Just return if nothing is left */
101 p = strrchr(tmp, '/');
102 if (!p)
103 return 0;
104 *(p + 1) = 0;
105
106 /* Just in case it is an absolute path */
107 p = tmp;
108 while (*p == '/')
109 p++;
110
111 while ((p = strchr(p, '/'))) {
112 *p = 0;
113
114 /* skip if the directory exists */
115 if (!is_dir(tmp) && mkdir(tmp, 0755))
116 return -1;
117
118 *p = '/';
119 while (*p == '/')
120 p++;
121 }
122
123 return 0;
124}
125
126static char depfile_path[PATH_MAX];
127static size_t depfile_prefix_len;
128
129/* touch depfile for symbol 'name' */
130static int conf_touch_dep(const char *name)
131{
132 int fd, ret;
133 char *d;
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 d = depfile_path + depfile_prefix_len;
140 strcpy(d, name);
141
142 /* Assume directory path already exists. */
143 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
144 if (fd == -1) {
145 if (errno != ENOENT)
146 return -1;
147
148 ret = make_parent_dir(depfile_path);
149 if (ret)
150 return ret;
151
152 /* Try it again. */
153 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
154 if (fd == -1)
155 return -1;
156 }
157 close(fd);
158
159 return 0;
160}
161
162struct conf_printer {
163 void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
164 void (*print_comment)(FILE *, const char *, void *);
165};
166
167static void conf_warning(const char *fmt, ...)
168 __attribute__ ((format (printf, 1, 2)));
169
170static void conf_message(const char *fmt, ...)
171 __attribute__ ((format (printf, 1, 2)));
172
173static const char *conf_filename;
174static int conf_lineno, conf_warnings;
175
176static void conf_warning(const char *fmt, ...)
177{
178 va_list ap;
179 va_start(ap, fmt);
180 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
181 vfprintf(stderr, fmt, ap);
182 fprintf(stderr, "\n");
183 va_end(ap);
184 conf_warnings++;
185}
186
187static void conf_default_message_callback(const char *s)
188{
189 printf("#\n# ");
190 printf("%s", s);
191 printf("\n#\n");
192}
193
194static void (*conf_message_callback)(const char *s) =
195 conf_default_message_callback;
196void conf_set_message_callback(void (*fn)(const char *s))
197{
198 conf_message_callback = fn;
199}
200
201static void conf_message(const char *fmt, ...)
202{
203 va_list ap;
204 char buf[4096];
205
206 if (!conf_message_callback)
207 return;
208
209 va_start(ap, fmt);
210
211 vsnprintf(buf, sizeof(buf), fmt, ap);
212 conf_message_callback(buf);
213 va_end(ap);
214}
215
216const char *conf_get_configname(void)
217{
218 char *name = getenv("KCONFIG_CONFIG");
219
220 return name ? name : ".config";
221}
222
223static const char *conf_get_autoconfig_name(void)
224{
225 char *name = getenv("KCONFIG_AUTOCONFIG");
226
227 return name ? name : "include/config/auto.conf";
228}
229
230static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
231{
232 char *p2;
233
234 switch (sym->type) {
235 case S_TRISTATE:
236 if (p[0] == 'm') {
237 sym->def[def].tri = mod;
238 sym->flags |= def_flags;
239 break;
240 }
241 /* fall through */
242 case S_BOOLEAN:
243 if (p[0] == 'y') {
244 sym->def[def].tri = yes;
245 sym->flags |= def_flags;
246 break;
247 }
248 if (p[0] == 'n') {
249 sym->def[def].tri = no;
250 sym->flags |= def_flags;
251 break;
252 }
253 if (def != S_DEF_AUTO)
254 conf_warning("symbol value '%s' invalid for %s",
255 p, sym->name);
256 return 1;
257 case S_STRING:
258 if (*p++ != '"')
259 break;
260 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
261 if (*p2 == '"') {
262 *p2 = 0;
263 break;
264 }
265 memmove(p2, p2 + 1, strlen(p2));
266 }
267 if (!p2) {
268 if (def != S_DEF_AUTO)
269 conf_warning("invalid string found");
270 return 1;
271 }
272 /* fall through */
273 case S_INT:
274 case S_HEX:
275 if (sym_string_valid(sym, p)) {
276 sym->def[def].val = xstrdup(p);
277 sym->flags |= def_flags;
278 } else {
279 if (def != S_DEF_AUTO)
280 conf_warning("symbol value '%s' invalid for %s",
281 p, sym->name);
282 return 1;
283 }
284 break;
285 default:
286 ;
287 }
288 return 0;
289}
290
291#define LINE_GROWTH 16
292static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
293{
294 char *nline;
295 size_t new_size = slen + 1;
296 if (new_size > *n) {
297 new_size += LINE_GROWTH - 1;
298 new_size *= 2;
299 nline = xrealloc(*lineptr, new_size);
300 if (!nline)
301 return -1;
302
303 *lineptr = nline;
304 *n = new_size;
305 }
306
307 (*lineptr)[slen] = c;
308
309 return 0;
310}
311
312static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
313{
314 char *line = *lineptr;
315 size_t slen = 0;
316
317 for (;;) {
318 int c = getc(stream);
319
320 switch (c) {
321 case '\n':
322 if (add_byte(c, &line, slen, n) < 0)
323 goto e_out;
324 slen++;
325 /* fall through */
326 case EOF:
327 if (add_byte('\0', &line, slen, n) < 0)
328 goto e_out;
329 *lineptr = line;
330 if (slen == 0)
331 return -1;
332 return slen;
333 default:
334 if (add_byte(c, &line, slen, n) < 0)
335 goto e_out;
336 slen++;
337 }
338 }
339
340e_out:
341 line[slen-1] = '\0';
342 *lineptr = line;
343 return -1;
344}
345
346int conf_read_simple(const char *name, int def)
347{
348 FILE *in = NULL;
349 char *line = NULL;
350 size_t line_asize = 0;
351 char *p, *p2;
352 struct symbol *sym;
353 int i, def_flags;
354
355 if (name) {
356 in = zconf_fopen(name);
357 } else {
358 char *env;
359
360 name = conf_get_configname();
361 in = zconf_fopen(name);
362 if (in)
363 goto load;
364 conf_set_changed(true);
365
366 env = getenv("KCONFIG_DEFCONFIG_LIST");
367 if (!env)
368 return 1;
369
370 while (1) {
371 bool is_last;
372
373 while (isspace(*env))
374 env++;
375
376 if (!*env)
377 break;
378
379 p = env;
380 while (*p && !isspace(*p))
381 p++;
382
383 is_last = (*p == '\0');
384
385 *p = '\0';
386
387 in = zconf_fopen(env);
388 if (in) {
389 conf_message("using defaults found in %s",
390 env);
391 goto load;
392 }
393
394 if (is_last)
395 break;
396
397 env = p + 1;
398 }
399 }
400 if (!in)
401 return 1;
402
403load:
404 conf_filename = name;
405 conf_lineno = 0;
406 conf_warnings = 0;
407
408 def_flags = SYMBOL_DEF << def;
409 for_all_symbols(i, sym) {
410 sym->flags |= SYMBOL_CHANGED;
411 sym->flags &= ~(def_flags|SYMBOL_VALID);
412 if (sym_is_choice(sym))
413 sym->flags |= def_flags;
414 switch (sym->type) {
415 case S_INT:
416 case S_HEX:
417 case S_STRING:
418 if (sym->def[def].val)
419 free(sym->def[def].val);
420 /* fall through */
421 default:
422 sym->def[def].val = NULL;
423 sym->def[def].tri = no;
424 }
425 }
426
427 while (compat_getline(&line, &line_asize, in) != -1) {
428 conf_lineno++;
429 sym = NULL;
430 if (line[0] == '#') {
431 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
432 continue;
433 p = strchr(line + 2 + strlen(CONFIG_), ' ');
434 if (!p)
435 continue;
436 *p++ = 0;
437 if (strncmp(p, "is not set", 10))
438 continue;
439 if (def == S_DEF_USER) {
440 sym = sym_find(line + 2 + strlen(CONFIG_));
441 if (!sym) {
442 conf_set_changed(true);
443 continue;
444 }
445 } else {
446 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
447 if (sym->type == S_UNKNOWN)
448 sym->type = S_BOOLEAN;
449 }
450 if (sym->flags & def_flags) {
451 conf_warning("override: reassigning to symbol %s", sym->name);
452 }
453 switch (sym->type) {
454 case S_BOOLEAN:
455 case S_TRISTATE:
456 sym->def[def].tri = no;
457 sym->flags |= def_flags;
458 break;
459 default:
460 ;
461 }
462 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
463 p = strchr(line + strlen(CONFIG_), '=');
464 if (!p)
465 continue;
466 *p++ = 0;
467 p2 = strchr(p, '\n');
468 if (p2) {
469 *p2-- = 0;
470 if (*p2 == '\r')
471 *p2 = 0;
472 }
473
474 sym = sym_find(line + strlen(CONFIG_));
475 if (!sym) {
476 if (def == S_DEF_AUTO)
477 /*
478 * Reading from include/config/auto.conf
479 * If CONFIG_FOO previously existed in
480 * auto.conf but it is missing now,
481 * include/config/FOO must be touched.
482 */
483 conf_touch_dep(line + strlen(CONFIG_));
484 else
485 conf_set_changed(true);
486 continue;
487 }
488
489 if (sym->flags & def_flags) {
490 conf_warning("override: reassigning to symbol %s", sym->name);
491 }
492 if (conf_set_sym_val(sym, def, def_flags, p))
493 continue;
494 } else {
495 if (line[0] != '\r' && line[0] != '\n')
496 conf_warning("unexpected data: %.*s",
497 (int)strcspn(line, "\r\n"), line);
498
499 continue;
500 }
501
502 if (sym && sym_is_choice_value(sym)) {
503 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
504 switch (sym->def[def].tri) {
505 case no:
506 break;
507 case mod:
508 if (cs->def[def].tri == yes) {
509 conf_warning("%s creates inconsistent choice state", sym->name);
510 cs->flags &= ~def_flags;
511 }
512 break;
513 case yes:
514 if (cs->def[def].tri != no)
515 conf_warning("override: %s changes choice state", sym->name);
516 cs->def[def].val = sym;
517 break;
518 }
519 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
520 }
521 }
522 free(line);
523 fclose(in);
524 return 0;
525}
526
527int conf_read(const char *name)
528{
529 struct symbol *sym;
530 int conf_unsaved = 0;
531 int i;
532
533 conf_set_changed(false);
534
535 if (conf_read_simple(name, S_DEF_USER)) {
536 sym_calc_value(modules_sym);
537 return 1;
538 }
539
540 sym_calc_value(modules_sym);
541
542 for_all_symbols(i, sym) {
543 sym_calc_value(sym);
544 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
545 continue;
546 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
547 /* check that calculated value agrees with saved value */
548 switch (sym->type) {
549 case S_BOOLEAN:
550 case S_TRISTATE:
551 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
552 continue;
553 break;
554 default:
555 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
556 continue;
557 break;
558 }
559 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
560 /* no previous value and not saved */
561 continue;
562 conf_unsaved++;
563 /* maybe print value in verbose mode... */
564 }
565
566 for_all_symbols(i, sym) {
567 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
568 /* Reset values of generates values, so they'll appear
569 * as new, if they should become visible, but that
570 * doesn't quite work if the Kconfig and the saved
571 * configuration disagree.
572 */
573 if (sym->visible == no && !conf_unsaved)
574 sym->flags &= ~SYMBOL_DEF_USER;
575 switch (sym->type) {
576 case S_STRING:
577 case S_INT:
578 case S_HEX:
579 /* Reset a string value if it's out of range */
580 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
581 break;
582 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
583 conf_unsaved++;
584 break;
585 default:
586 break;
587 }
588 }
589 }
590
591 if (conf_warnings || conf_unsaved)
592 conf_set_changed(true);
593
594 return 0;
595}
596
597/*
598 * Kconfig configuration printer
599 *
600 * This printer is used when generating the resulting configuration after
601 * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
602 * passing a non-NULL argument to the printer.
603 *
604 */
605static void
606kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
607{
608
609 switch (sym->type) {
610 case S_BOOLEAN:
611 case S_TRISTATE:
612 if (*value == 'n') {
613 bool skip_unset = (arg != NULL);
614
615 if (!skip_unset)
616 fprintf(fp, "# %s%s is not set\n",
617 CONFIG_, sym->name);
618 return;
619 }
620 break;
621 default:
622 break;
623 }
624
625 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
626}
627
628static void
629kconfig_print_comment(FILE *fp, const char *value, void *arg)
630{
631 const char *p = value;
632 size_t l;
633
634 for (;;) {
635 l = strcspn(p, "\n");
636 fprintf(fp, "#");
637 if (l) {
638 fprintf(fp, " ");
639 xfwrite(p, l, 1, fp);
640 p += l;
641 }
642 fprintf(fp, "\n");
643 if (*p++ == '\0')
644 break;
645 }
646}
647
648static struct conf_printer kconfig_printer_cb =
649{
650 .print_symbol = kconfig_print_symbol,
651 .print_comment = kconfig_print_comment,
652};
653
654/*
655 * Header printer
656 *
657 * This printer is used when generating the `include/generated/autoconf.h' file.
658 */
659static void
660header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
661{
662
663 switch (sym->type) {
664 case S_BOOLEAN:
665 case S_TRISTATE: {
666 const char *suffix = "";
667
668 switch (*value) {
669 case 'n':
670 break;
671 case 'm':
672 suffix = "_MODULE";
673 /* fall through */
674 default:
675 fprintf(fp, "#define %s%s%s 1\n",
676 CONFIG_, sym->name, suffix);
677 }
678 break;
679 }
680 case S_HEX: {
681 const char *prefix = "";
682
683 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
684 prefix = "0x";
685 fprintf(fp, "#define %s%s %s%s\n",
686 CONFIG_, sym->name, prefix, value);
687 break;
688 }
689 case S_STRING:
690 case S_INT:
691 fprintf(fp, "#define %s%s %s\n",
692 CONFIG_, sym->name, value);
693 break;
694 default:
695 break;
696 }
697
698}
699
700static void
701header_print_comment(FILE *fp, const char *value, void *arg)
702{
703 const char *p = value;
704 size_t l;
705
706 fprintf(fp, "/*\n");
707 for (;;) {
708 l = strcspn(p, "\n");
709 fprintf(fp, " *");
710 if (l) {
711 fprintf(fp, " ");
712 xfwrite(p, l, 1, fp);
713 p += l;
714 }
715 fprintf(fp, "\n");
716 if (*p++ == '\0')
717 break;
718 }
719 fprintf(fp, " */\n");
720}
721
722static struct conf_printer header_printer_cb =
723{
724 .print_symbol = header_print_symbol,
725 .print_comment = header_print_comment,
726};
727
728static void conf_write_symbol(FILE *fp, struct symbol *sym,
729 struct conf_printer *printer, void *printer_arg)
730{
731 const char *str;
732
733 switch (sym->type) {
734 case S_UNKNOWN:
735 break;
736 case S_STRING:
737 str = sym_get_string_value(sym);
738 str = sym_escape_string_value(str);
739 printer->print_symbol(fp, sym, str, printer_arg);
740 free((void *)str);
741 break;
742 default:
743 str = sym_get_string_value(sym);
744 printer->print_symbol(fp, sym, str, printer_arg);
745 }
746}
747
748static void
749conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
750{
751 char buf[256];
752
753 snprintf(buf, sizeof(buf),
754 "\n"
755 "Automatically generated file; DO NOT EDIT.\n"
756 "%s\n",
757 rootmenu.prompt->text);
758
759 printer->print_comment(fp, buf, printer_arg);
760}
761
762/*
763 * Write out a minimal config.
764 * All values that has default values are skipped as this is redundant.
765 */
766int conf_write_defconfig(const char *filename)
767{
768 struct symbol *sym;
769 struct menu *menu;
770 FILE *out;
771
772 out = fopen(filename, "w");
773 if (!out)
774 return 1;
775
776 sym_clear_all_valid();
777
778 /* Traverse all menus to find all relevant symbols */
779 menu = rootmenu.list;
780
781 while (menu != NULL)
782 {
783 sym = menu->sym;
784 if (sym == NULL) {
785 if (!menu_is_visible(menu))
786 goto next_menu;
787 } else if (!sym_is_choice(sym)) {
788 sym_calc_value(sym);
789 if (!(sym->flags & SYMBOL_WRITE))
790 goto next_menu;
791 sym->flags &= ~SYMBOL_WRITE;
792 /* If we cannot change the symbol - skip */
793 if (!sym_is_changeable(sym))
794 goto next_menu;
795 /* If symbol equals to default value - skip */
796 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
797 goto next_menu;
798
799 /*
800 * If symbol is a choice value and equals to the
801 * default for a choice - skip.
802 * But only if value is bool and equal to "y" and
803 * choice is not "optional".
804 * (If choice is "optional" then all values can be "n")
805 */
806 if (sym_is_choice_value(sym)) {
807 struct symbol *cs;
808 struct symbol *ds;
809
810 cs = prop_get_symbol(sym_get_choice_prop(sym));
811 ds = sym_choice_default(cs);
812 if (!sym_is_optional(cs) && sym == ds) {
813 if ((sym->type == S_BOOLEAN) &&
814 sym_get_tristate_value(sym) == yes)
815 goto next_menu;
816 }
817 }
818 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
819 }
820next_menu:
821 if (menu->list != NULL) {
822 menu = menu->list;
823 }
824 else if (menu->next != NULL) {
825 menu = menu->next;
826 } else {
827 while ((menu = menu->parent)) {
828 if (menu->next != NULL) {
829 menu = menu->next;
830 break;
831 }
832 }
833 }
834 }
835 fclose(out);
836 return 0;
837}
838
839int conf_write(const char *name)
840{
841 FILE *out;
842 struct symbol *sym;
843 struct menu *menu;
844 const char *str;
845 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
846 char *env;
847 int i;
848 bool need_newline = false;
849
850 if (!name)
851 name = conf_get_configname();
852
853 if (!*name) {
854 fprintf(stderr, "config name is empty\n");
855 return -1;
856 }
857
858 if (is_dir(name)) {
859 fprintf(stderr, "%s: Is a directory\n", name);
860 return -1;
861 }
862
863 if (make_parent_dir(name))
864 return -1;
865
866 env = getenv("KCONFIG_OVERWRITECONFIG");
867 if (env && *env) {
868 *tmpname = 0;
869 out = fopen(name, "w");
870 } else {
871 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
872 name, (int)getpid());
873 out = fopen(tmpname, "w");
874 }
875 if (!out)
876 return 1;
877
878 conf_write_heading(out, &kconfig_printer_cb, NULL);
879
880 if (!conf_get_changed())
881 sym_clear_all_valid();
882
883 menu = rootmenu.list;
884 while (menu) {
885 sym = menu->sym;
886 if (!sym) {
887 if (!menu_is_visible(menu))
888 goto next;
889 str = menu_get_prompt(menu);
890 fprintf(out, "\n"
891 "#\n"
892 "# %s\n"
893 "#\n", str);
894 need_newline = false;
895 } else if (!(sym->flags & SYMBOL_CHOICE) &&
896 !(sym->flags & SYMBOL_WRITTEN)) {
897 sym_calc_value(sym);
898 if (!(sym->flags & SYMBOL_WRITE))
899 goto next;
900 if (need_newline) {
901 fprintf(out, "\n");
902 need_newline = false;
903 }
904 sym->flags |= SYMBOL_WRITTEN;
905 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
906 }
907
908next:
909 if (menu->list) {
910 menu = menu->list;
911 continue;
912 }
913 if (menu->next)
914 menu = menu->next;
915 else while ((menu = menu->parent)) {
916 if (!menu->sym && menu_is_visible(menu) &&
917 menu != &rootmenu) {
918 str = menu_get_prompt(menu);
919 fprintf(out, "# end of %s\n", str);
920 need_newline = true;
921 }
922 if (menu->next) {
923 menu = menu->next;
924 break;
925 }
926 }
927 }
928 fclose(out);
929
930 for_all_symbols(i, sym)
931 sym->flags &= ~SYMBOL_WRITTEN;
932
933 if (*tmpname) {
934 if (is_same(name, tmpname)) {
935 conf_message("No change to %s", name);
936 unlink(tmpname);
937 conf_set_changed(false);
938 return 0;
939 }
940
941 snprintf(oldname, sizeof(oldname), "%s.old", name);
942 rename(name, oldname);
943 if (rename(tmpname, name))
944 return 1;
945 }
946
947 conf_message("configuration written to %s", name);
948
949 conf_set_changed(false);
950
951 return 0;
952}
953
954/* write a dependency file as used by kbuild to track dependencies */
955static int conf_write_dep(const char *name)
956{
957 struct file *file;
958 FILE *out;
959
960 out = fopen("..config.tmp", "w");
961 if (!out)
962 return 1;
963 fprintf(out, "deps_config := \\\n");
964 for (file = file_list; file; file = file->next) {
965 if (file->next)
966 fprintf(out, "\t%s \\\n", file->name);
967 else
968 fprintf(out, "\t%s\n", file->name);
969 }
970 fprintf(out, "\n%s: \\\n"
971 "\t$(deps_config)\n\n", conf_get_autoconfig_name());
972
973 env_write_dep(out, conf_get_autoconfig_name());
974
975 fprintf(out, "\n$(deps_config): ;\n");
976 fclose(out);
977
978 if (make_parent_dir(name))
979 return 1;
980 rename("..config.tmp", name);
981 return 0;
982}
983
984static int conf_touch_deps(void)
985{
986 const char *name;
987 struct symbol *sym;
988 int res, i;
989
990 strcpy(depfile_path, "include/config/");
991 depfile_prefix_len = strlen(depfile_path);
992
993 name = conf_get_autoconfig_name();
994 conf_read_simple(name, S_DEF_AUTO);
995 sym_calc_value(modules_sym);
996
997 for_all_symbols(i, sym) {
998 sym_calc_value(sym);
999 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1000 continue;
1001 if (sym->flags & SYMBOL_WRITE) {
1002 if (sym->flags & SYMBOL_DEF_AUTO) {
1003 /*
1004 * symbol has old and new value,
1005 * so compare them...
1006 */
1007 switch (sym->type) {
1008 case S_BOOLEAN:
1009 case S_TRISTATE:
1010 if (sym_get_tristate_value(sym) ==
1011 sym->def[S_DEF_AUTO].tri)
1012 continue;
1013 break;
1014 case S_STRING:
1015 case S_HEX:
1016 case S_INT:
1017 if (!strcmp(sym_get_string_value(sym),
1018 sym->def[S_DEF_AUTO].val))
1019 continue;
1020 break;
1021 default:
1022 break;
1023 }
1024 } else {
1025 /*
1026 * If there is no old value, only 'no' (unset)
1027 * is allowed as new value.
1028 */
1029 switch (sym->type) {
1030 case S_BOOLEAN:
1031 case S_TRISTATE:
1032 if (sym_get_tristate_value(sym) == no)
1033 continue;
1034 break;
1035 default:
1036 break;
1037 }
1038 }
1039 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1040 /* There is neither an old nor a new value. */
1041 continue;
1042 /* else
1043 * There is an old value, but no new value ('no' (unset)
1044 * isn't saved in auto.conf, so the old value is always
1045 * different from 'no').
1046 */
1047
1048 res = conf_touch_dep(sym->name);
1049 if (res)
1050 return res;
1051 }
1052
1053 return 0;
1054}
1055
1056int conf_write_autoconf(int overwrite)
1057{
1058 struct symbol *sym;
1059 const char *name;
1060 const char *autoconf_name = conf_get_autoconfig_name();
1061 FILE *out, *out_h;
1062 int i;
1063
1064 if (!overwrite && is_present(autoconf_name))
1065 return 0;
1066
1067 conf_write_dep("include/config/auto.conf.cmd");
1068
1069 if (conf_touch_deps())
1070 return 1;
1071
1072 out = fopen(".tmpconfig", "w");
1073 if (!out)
1074 return 1;
1075
1076 out_h = fopen(".tmpconfig.h", "w");
1077 if (!out_h) {
1078 fclose(out);
1079 return 1;
1080 }
1081
1082 conf_write_heading(out, &kconfig_printer_cb, NULL);
1083 conf_write_heading(out_h, &header_printer_cb, NULL);
1084
1085 for_all_symbols(i, sym) {
1086 sym_calc_value(sym);
1087 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1088 continue;
1089
1090 /* write symbols to auto.conf and autoconf.h */
1091 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1092 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1093 }
1094 fclose(out);
1095 fclose(out_h);
1096
1097 name = getenv("KCONFIG_AUTOHEADER");
1098 if (!name)
1099 name = "include/generated/autoconf.h";
1100 if (make_parent_dir(name))
1101 return 1;
1102 if (rename(".tmpconfig.h", name))
1103 return 1;
1104
1105 if (make_parent_dir(autoconf_name))
1106 return 1;
1107 /*
1108 * This must be the last step, kbuild has a dependency on auto.conf
1109 * and this marks the successful completion of the previous steps.
1110 */
1111 if (rename(".tmpconfig", autoconf_name))
1112 return 1;
1113
1114 return 0;
1115}
1116
1117static bool conf_changed;
1118static void (*conf_changed_callback)(void);
1119
1120void conf_set_changed(bool val)
1121{
1122 if (conf_changed_callback && conf_changed != val)
1123 conf_changed_callback();
1124
1125 conf_changed = val;
1126}
1127
1128bool conf_get_changed(void)
1129{
1130 return conf_changed;
1131}
1132
1133void conf_set_changed_callback(void (*fn)(void))
1134{
1135 conf_changed_callback = fn;
1136}
1137
1138void set_all_choice_values(struct symbol *csym)
1139{
1140 struct property *prop;
1141 struct symbol *sym;
1142 struct expr *e;
1143
1144 prop = sym_get_choice_prop(csym);
1145
1146 /*
1147 * Set all non-assinged choice values to no
1148 */
1149 expr_list_for_each_sym(prop->expr, e, sym) {
1150 if (!sym_has_value(sym))
1151 sym->def[S_DEF_USER].tri = no;
1152 }
1153 csym->flags |= SYMBOL_DEF_USER;
1154 /* clear VALID to get value calculated */
1155 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1156}
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}