Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <ctype.h>
10#include <errno.h>
11#include <fcntl.h>
12#include <limits.h>
13#include <stdarg.h>
14#include <stdbool.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <string.h>
18#include <time.h>
19#include <unistd.h>
20
21#include <xalloc.h>
22#include "internal.h"
23#include "lkc.h"
24
25struct gstr autoconf_cmd;
26
27/* return true if 'path' exists, false otherwise */
28static bool is_present(const char *path)
29{
30 struct stat st;
31
32 return !stat(path, &st);
33}
34
35/* return true if 'path' exists and it is a directory, false otherwise */
36static bool is_dir(const char *path)
37{
38 struct stat st;
39
40 if (stat(path, &st))
41 return false;
42
43 return S_ISDIR(st.st_mode);
44}
45
46/* return true if the given two files are the same, false otherwise */
47static bool is_same(const char *file1, const char *file2)
48{
49 int fd1, fd2;
50 struct stat st1, st2;
51 void *map1, *map2;
52 bool ret = false;
53
54 fd1 = open(file1, O_RDONLY);
55 if (fd1 < 0)
56 return ret;
57
58 fd2 = open(file2, O_RDONLY);
59 if (fd2 < 0)
60 goto close1;
61
62 ret = fstat(fd1, &st1);
63 if (ret)
64 goto close2;
65 ret = fstat(fd2, &st2);
66 if (ret)
67 goto close2;
68
69 if (st1.st_size != st2.st_size)
70 goto close2;
71
72 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
73 if (map1 == MAP_FAILED)
74 goto close2;
75
76 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
77 if (map2 == MAP_FAILED)
78 goto close2;
79
80 if (bcmp(map1, map2, st1.st_size))
81 goto close2;
82
83 ret = true;
84close2:
85 close(fd2);
86close1:
87 close(fd1);
88
89 return ret;
90}
91
92/*
93 * Create the parent directory of the given path.
94 *
95 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
96 */
97static int make_parent_dir(const char *path)
98{
99 char tmp[PATH_MAX + 1];
100 char *p;
101
102 strncpy(tmp, path, sizeof(tmp));
103 tmp[sizeof(tmp) - 1] = 0;
104
105 /* Remove the base name. Just return if nothing is left */
106 p = strrchr(tmp, '/');
107 if (!p)
108 return 0;
109 *(p + 1) = 0;
110
111 /* Just in case it is an absolute path */
112 p = tmp;
113 while (*p == '/')
114 p++;
115
116 while ((p = strchr(p, '/'))) {
117 *p = 0;
118
119 /* skip if the directory exists */
120 if (!is_dir(tmp) && mkdir(tmp, 0755))
121 return -1;
122
123 *p = '/';
124 while (*p == '/')
125 p++;
126 }
127
128 return 0;
129}
130
131static char depfile_path[PATH_MAX];
132static size_t depfile_prefix_len;
133
134/* touch depfile for symbol 'name' */
135static int conf_touch_dep(const char *name)
136{
137 int fd;
138
139 /* check overflow: prefix + name + '\0' must fit in buffer. */
140 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
141 return -1;
142
143 strcpy(depfile_path + depfile_prefix_len, name);
144
145 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
146 if (fd == -1)
147 return -1;
148 close(fd);
149
150 return 0;
151}
152
153static void conf_warning(const char *fmt, ...)
154 __attribute__ ((format (printf, 1, 2)));
155
156static void conf_message(const char *fmt, ...)
157 __attribute__ ((format (printf, 1, 2)));
158
159static const char *conf_filename;
160static int conf_lineno, conf_warnings;
161
162bool conf_errors(void)
163{
164 if (conf_warnings)
165 return getenv("KCONFIG_WERROR");
166 return false;
167}
168
169static void conf_warning(const char *fmt, ...)
170{
171 va_list ap;
172 va_start(ap, fmt);
173 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
174 vfprintf(stderr, fmt, ap);
175 fprintf(stderr, "\n");
176 va_end(ap);
177 conf_warnings++;
178}
179
180static void conf_default_message_callback(const char *s)
181{
182 printf("#\n# ");
183 printf("%s", s);
184 printf("\n#\n");
185}
186
187static void (*conf_message_callback)(const char *s) =
188 conf_default_message_callback;
189void conf_set_message_callback(void (*fn)(const char *s))
190{
191 conf_message_callback = fn;
192}
193
194static void conf_message(const char *fmt, ...)
195{
196 va_list ap;
197 char buf[4096];
198
199 if (!conf_message_callback)
200 return;
201
202 va_start(ap, fmt);
203
204 vsnprintf(buf, sizeof(buf), fmt, ap);
205 conf_message_callback(buf);
206 va_end(ap);
207}
208
209const char *conf_get_configname(void)
210{
211 char *name = getenv("KCONFIG_CONFIG");
212
213 return name ? name : ".config";
214}
215
216static const char *conf_get_autoconfig_name(void)
217{
218 char *name = getenv("KCONFIG_AUTOCONFIG");
219
220 return name ? name : "include/config/auto.conf";
221}
222
223static const char *conf_get_autoheader_name(void)
224{
225 char *name = getenv("KCONFIG_AUTOHEADER");
226
227 return name ? name : "include/generated/autoconf.h";
228}
229
230static const char *conf_get_rustccfg_name(void)
231{
232 char *name = getenv("KCONFIG_RUSTCCFG");
233
234 return name ? name : "include/generated/rustc_cfg";
235}
236
237static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
238{
239 char *p2;
240
241 switch (sym->type) {
242 case S_TRISTATE:
243 if (p[0] == 'm') {
244 sym->def[def].tri = mod;
245 sym->flags |= def_flags;
246 break;
247 }
248 /* fall through */
249 case S_BOOLEAN:
250 if (p[0] == 'y') {
251 sym->def[def].tri = yes;
252 sym->flags |= def_flags;
253 break;
254 }
255 if (p[0] == 'n') {
256 sym->def[def].tri = no;
257 sym->flags |= def_flags;
258 break;
259 }
260 if (def != S_DEF_AUTO)
261 conf_warning("symbol value '%s' invalid for %s",
262 p, sym->name);
263 return 1;
264 case S_STRING:
265 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
266 if (def != S_DEF_AUTO) {
267 if (*p++ != '"')
268 break;
269 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
270 if (*p2 == '"') {
271 *p2 = 0;
272 break;
273 }
274 memmove(p2, p2 + 1, strlen(p2));
275 }
276 if (!p2) {
277 conf_warning("invalid string found");
278 return 1;
279 }
280 }
281 /* fall through */
282 case S_INT:
283 case S_HEX:
284 if (sym_string_valid(sym, p)) {
285 sym->def[def].val = xstrdup(p);
286 sym->flags |= def_flags;
287 } else {
288 if (def != S_DEF_AUTO)
289 conf_warning("symbol value '%s' invalid for %s",
290 p, sym->name);
291 return 1;
292 }
293 break;
294 default:
295 ;
296 }
297 return 0;
298}
299
300/* like getline(), but the newline character is stripped away */
301static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
302{
303 ssize_t len;
304
305 len = getline(lineptr, n, stream);
306
307 if (len > 0 && (*lineptr)[len - 1] == '\n') {
308 len--;
309 (*lineptr)[len] = '\0';
310
311 if (len > 0 && (*lineptr)[len - 1] == '\r') {
312 len--;
313 (*lineptr)[len] = '\0';
314 }
315 }
316
317 return len;
318}
319
320int conf_read_simple(const char *name, int def)
321{
322 FILE *in = NULL;
323 char *line = NULL;
324 size_t line_asize = 0;
325 char *p, *val;
326 struct symbol *sym;
327 int def_flags;
328 const char *warn_unknown, *sym_name;
329
330 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
331 if (name) {
332 in = zconf_fopen(name);
333 } else {
334 char *env;
335
336 name = conf_get_configname();
337 in = zconf_fopen(name);
338 if (in)
339 goto load;
340 conf_set_changed(true);
341
342 env = getenv("KCONFIG_DEFCONFIG_LIST");
343 if (!env)
344 return 1;
345
346 while (1) {
347 bool is_last;
348
349 while (isspace(*env))
350 env++;
351
352 if (!*env)
353 break;
354
355 p = env;
356 while (*p && !isspace(*p))
357 p++;
358
359 is_last = (*p == '\0');
360
361 *p = '\0';
362
363 name = env;
364
365 in = zconf_fopen(name);
366 if (in) {
367 conf_message("using defaults found in %s",
368 name);
369 goto load;
370 }
371
372 if (is_last)
373 break;
374
375 env = p + 1;
376 }
377 }
378 if (!in)
379 return 1;
380
381load:
382 conf_filename = name;
383 conf_lineno = 0;
384 conf_warnings = 0;
385
386 def_flags = SYMBOL_DEF << def;
387 for_all_symbols(sym) {
388 sym->flags &= ~(def_flags|SYMBOL_VALID);
389 switch (sym->type) {
390 case S_INT:
391 case S_HEX:
392 case S_STRING:
393 free(sym->def[def].val);
394 /* fall through */
395 default:
396 sym->def[def].val = NULL;
397 sym->def[def].tri = no;
398 }
399 }
400
401 expr_invalidate_all();
402
403 while (getline_stripped(&line, &line_asize, in) != -1) {
404 struct menu *choice;
405
406 conf_lineno++;
407
408 if (!line[0]) /* blank line */
409 continue;
410
411 if (line[0] == '#') {
412 if (line[1] != ' ')
413 continue;
414 p = line + 2;
415 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
416 continue;
417 sym_name = p + strlen(CONFIG_);
418 p = strchr(sym_name, ' ');
419 if (!p)
420 continue;
421 *p++ = 0;
422 if (strcmp(p, "is not set"))
423 continue;
424
425 val = "n";
426 } else {
427 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
428 conf_warning("unexpected data: %s", line);
429 continue;
430 }
431
432 sym_name = line + strlen(CONFIG_);
433 p = strchr(sym_name, '=');
434 if (!p) {
435 conf_warning("unexpected data: %s", line);
436 continue;
437 }
438 *p = 0;
439 val = p + 1;
440 }
441
442 sym = sym_find(sym_name);
443 if (!sym) {
444 if (def == S_DEF_AUTO) {
445 /*
446 * Reading from include/config/auto.conf.
447 * If CONFIG_FOO previously existed in auto.conf
448 * but it is missing now, include/config/FOO
449 * must be touched.
450 */
451 conf_touch_dep(sym_name);
452 } else {
453 if (warn_unknown)
454 conf_warning("unknown symbol: %s", sym_name);
455
456 conf_set_changed(true);
457 }
458 continue;
459 }
460
461 if (sym->flags & def_flags)
462 conf_warning("override: reassigning to symbol %s", sym->name);
463
464 if (conf_set_sym_val(sym, def, def_flags, val))
465 continue;
466
467 /*
468 * If this is a choice member, give it the highest priority.
469 * If conflicting CONFIG options are given from an input file,
470 * the last one wins.
471 */
472 choice = sym_get_choice_menu(sym);
473 if (choice)
474 list_move(&sym->choice_link, &choice->choice_members);
475 }
476 free(line);
477 fclose(in);
478
479 return 0;
480}
481
482int conf_read(const char *name)
483{
484 struct symbol *sym;
485
486 conf_set_changed(false);
487
488 if (conf_read_simple(name, S_DEF_USER)) {
489 sym_calc_value(modules_sym);
490 return 1;
491 }
492
493 sym_calc_value(modules_sym);
494
495 for_all_symbols(sym) {
496 sym_calc_value(sym);
497 if (sym_is_choice(sym))
498 continue;
499 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
500 /* check that calculated value agrees with saved value */
501 switch (sym->type) {
502 case S_BOOLEAN:
503 case S_TRISTATE:
504 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
505 continue;
506 break;
507 default:
508 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
509 continue;
510 break;
511 }
512 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
513 /* no previous value and not saved */
514 continue;
515 conf_set_changed(true);
516 /* maybe print value in verbose mode... */
517 }
518
519 if (conf_warnings)
520 conf_set_changed(true);
521
522 return 0;
523}
524
525struct comment_style {
526 const char *decoration;
527 const char *prefix;
528 const char *postfix;
529};
530
531static const struct comment_style comment_style_pound = {
532 .decoration = "#",
533 .prefix = "#",
534 .postfix = "#",
535};
536
537static const struct comment_style comment_style_c = {
538 .decoration = " *",
539 .prefix = "/*",
540 .postfix = " */",
541};
542
543static void conf_write_heading(FILE *fp, const struct comment_style *cs)
544{
545 if (!cs)
546 return;
547
548 fprintf(fp, "%s\n", cs->prefix);
549
550 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
551 cs->decoration);
552
553 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
554
555 fprintf(fp, "%s\n", cs->postfix);
556}
557
558/* The returned pointer must be freed on the caller side */
559static char *escape_string_value(const char *in)
560{
561 const char *p;
562 char *out;
563 size_t len;
564
565 len = strlen(in) + strlen("\"\"") + 1;
566
567 p = in;
568 while (1) {
569 p += strcspn(p, "\"\\");
570
571 if (p[0] == '\0')
572 break;
573
574 len++;
575 p++;
576 }
577
578 out = xmalloc(len);
579 out[0] = '\0';
580
581 strcat(out, "\"");
582
583 p = in;
584 while (1) {
585 len = strcspn(p, "\"\\");
586 strncat(out, p, len);
587 p += len;
588
589 if (p[0] == '\0')
590 break;
591
592 strcat(out, "\\");
593 strncat(out, p++, 1);
594 }
595
596 strcat(out, "\"");
597
598 return out;
599}
600
601enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
602
603static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
604 bool escape_string)
605{
606 const char *val;
607 char *escaped = NULL;
608
609 if (sym->type == S_UNKNOWN)
610 return;
611
612 val = sym_get_string_value(sym);
613
614 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
615 output_n != OUTPUT_N && *val == 'n') {
616 if (output_n == OUTPUT_N_AS_UNSET)
617 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
618 return;
619 }
620
621 if (sym->type == S_STRING && escape_string) {
622 escaped = escape_string_value(val);
623 val = escaped;
624 }
625
626 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
627
628 free(escaped);
629}
630
631static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
632{
633 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
634}
635
636static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
637{
638 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
639}
640
641void print_symbol_for_listconfig(struct symbol *sym)
642{
643 __print_symbol(stdout, sym, OUTPUT_N, true);
644}
645
646static void print_symbol_for_c(FILE *fp, struct symbol *sym)
647{
648 const char *val;
649 const char *sym_suffix = "";
650 const char *val_prefix = "";
651 char *escaped = NULL;
652
653 if (sym->type == S_UNKNOWN)
654 return;
655
656 val = sym_get_string_value(sym);
657
658 switch (sym->type) {
659 case S_BOOLEAN:
660 case S_TRISTATE:
661 switch (*val) {
662 case 'n':
663 return;
664 case 'm':
665 sym_suffix = "_MODULE";
666 /* fall through */
667 default:
668 val = "1";
669 }
670 break;
671 case S_HEX:
672 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
673 val_prefix = "0x";
674 break;
675 case S_STRING:
676 escaped = escape_string_value(val);
677 val = escaped;
678 default:
679 break;
680 }
681
682 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
683 val_prefix, val);
684
685 free(escaped);
686}
687
688static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
689{
690 const char *val;
691 const char *val_prefix = "";
692 char *val_prefixed = NULL;
693 size_t val_prefixed_len;
694 char *escaped = NULL;
695
696 if (sym->type == S_UNKNOWN)
697 return;
698
699 val = sym_get_string_value(sym);
700
701 switch (sym->type) {
702 case S_BOOLEAN:
703 case S_TRISTATE:
704 /*
705 * We do not care about disabled ones, i.e. no need for
706 * what otherwise are "comments" in other printers.
707 */
708 if (*val == 'n')
709 return;
710
711 /*
712 * To have similar functionality to the C macro `IS_ENABLED()`
713 * we provide an empty `--cfg CONFIG_X` here in both `y`
714 * and `m` cases.
715 *
716 * Then, the common `fprintf()` below will also give us
717 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
718 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
719 */
720 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
721 break;
722 case S_HEX:
723 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
724 val_prefix = "0x";
725 break;
726 default:
727 break;
728 }
729
730 if (strlen(val_prefix) > 0) {
731 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
732 val_prefixed = xmalloc(val_prefixed_len);
733 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
734 val = val_prefixed;
735 }
736
737 /* All values get escaped: the `--cfg` option only takes strings */
738 escaped = escape_string_value(val);
739 val = escaped;
740
741 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
742
743 free(escaped);
744 free(val_prefixed);
745}
746
747/*
748 * Write out a minimal config.
749 * All values that has default values are skipped as this is redundant.
750 */
751int conf_write_defconfig(const char *filename)
752{
753 struct symbol *sym;
754 struct menu *menu;
755 FILE *out;
756
757 out = fopen(filename, "w");
758 if (!out)
759 return 1;
760
761 sym_clear_all_valid();
762
763 menu_for_each_entry(menu) {
764 struct menu *choice;
765
766 sym = menu->sym;
767
768 if (!sym || sym_is_choice(sym))
769 continue;
770
771 sym_calc_value(sym);
772 if (!(sym->flags & SYMBOL_WRITE))
773 continue;
774 sym->flags &= ~SYMBOL_WRITE;
775 /* Skip unchangeable symbols */
776 if (!sym_is_changeable(sym))
777 continue;
778 /* Skip symbols that are equal to the default */
779 if (!strcmp(sym_get_string_value(sym), sym_get_string_default(sym)))
780 continue;
781
782 /* Skip choice values that are equal to the default */
783 choice = sym_get_choice_menu(sym);
784 if (choice) {
785 struct symbol *ds;
786
787 ds = sym_choice_default(choice);
788 if (sym == ds && sym_get_tristate_value(sym) == yes)
789 continue;
790 }
791 print_symbol_for_dotconfig(out, sym);
792 }
793 fclose(out);
794 return 0;
795}
796
797int conf_write(const char *name)
798{
799 FILE *out;
800 struct symbol *sym;
801 struct menu *menu;
802 const char *str;
803 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
804 char *env;
805 bool need_newline = false;
806
807 if (!name)
808 name = conf_get_configname();
809
810 if (!*name) {
811 fprintf(stderr, "config name is empty\n");
812 return -1;
813 }
814
815 if (is_dir(name)) {
816 fprintf(stderr, "%s: Is a directory\n", name);
817 return -1;
818 }
819
820 if (make_parent_dir(name))
821 return -1;
822
823 env = getenv("KCONFIG_OVERWRITECONFIG");
824 if (env && *env) {
825 *tmpname = 0;
826 out = fopen(name, "w");
827 } else {
828 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
829 name, (int)getpid());
830 out = fopen(tmpname, "w");
831 }
832 if (!out)
833 return 1;
834
835 conf_write_heading(out, &comment_style_pound);
836
837 if (!conf_get_changed())
838 sym_clear_all_valid();
839
840 menu = rootmenu.list;
841 while (menu) {
842 sym = menu->sym;
843 if (!sym) {
844 if (!menu_is_visible(menu))
845 goto next;
846 str = menu_get_prompt(menu);
847 fprintf(out, "\n"
848 "#\n"
849 "# %s\n"
850 "#\n", str);
851 need_newline = false;
852 } else if (!sym_is_choice(sym) &&
853 !(sym->flags & SYMBOL_WRITTEN)) {
854 sym_calc_value(sym);
855 if (!(sym->flags & SYMBOL_WRITE))
856 goto next;
857 if (need_newline) {
858 fprintf(out, "\n");
859 need_newline = false;
860 }
861 sym->flags |= SYMBOL_WRITTEN;
862 print_symbol_for_dotconfig(out, sym);
863 }
864
865next:
866 if (menu->list) {
867 menu = menu->list;
868 continue;
869 }
870
871end_check:
872 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
873 menu->prompt->type == P_MENU) {
874 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
875 need_newline = true;
876 }
877
878 if (menu->next) {
879 menu = menu->next;
880 } else {
881 menu = menu->parent;
882 if (menu)
883 goto end_check;
884 }
885 }
886 fclose(out);
887
888 for_all_symbols(sym)
889 sym->flags &= ~SYMBOL_WRITTEN;
890
891 if (*tmpname) {
892 if (is_same(name, tmpname)) {
893 conf_message("No change to %s", name);
894 unlink(tmpname);
895 conf_set_changed(false);
896 return 0;
897 }
898
899 snprintf(oldname, sizeof(oldname), "%s.old", name);
900 rename(name, oldname);
901 if (rename(tmpname, name))
902 return 1;
903 }
904
905 conf_message("configuration written to %s", name);
906
907 conf_set_changed(false);
908
909 return 0;
910}
911
912/* write a dependency file as used by kbuild to track dependencies */
913static int conf_write_autoconf_cmd(const char *autoconf_name)
914{
915 char name[PATH_MAX], tmp[PATH_MAX];
916 FILE *out;
917 int ret;
918
919 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
920 if (ret >= sizeof(name)) /* check truncation */
921 return -1;
922
923 if (make_parent_dir(name))
924 return -1;
925
926 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
927 if (ret >= sizeof(tmp)) /* check truncation */
928 return -1;
929
930 out = fopen(tmp, "w");
931 if (!out) {
932 perror("fopen");
933 return -1;
934 }
935
936 fprintf(out, "autoconfig := %s\n", autoconf_name);
937
938 fputs(str_get(&autoconf_cmd), out);
939
940 fflush(out);
941 ret = ferror(out); /* error check for all fprintf() calls */
942 fclose(out);
943 if (ret)
944 return -1;
945
946 if (rename(tmp, name)) {
947 perror("rename");
948 return -1;
949 }
950
951 return 0;
952}
953
954static int conf_touch_deps(void)
955{
956 const char *name, *tmp;
957 struct symbol *sym;
958 int res;
959
960 name = conf_get_autoconfig_name();
961 tmp = strrchr(name, '/');
962 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
963 if (depfile_prefix_len + 1 > sizeof(depfile_path))
964 return -1;
965
966 strncpy(depfile_path, name, depfile_prefix_len);
967 depfile_path[depfile_prefix_len] = 0;
968
969 conf_read_simple(name, S_DEF_AUTO);
970 sym_calc_value(modules_sym);
971
972 for_all_symbols(sym) {
973 sym_calc_value(sym);
974 if (sym_is_choice(sym))
975 continue;
976 if (sym->flags & SYMBOL_WRITE) {
977 if (sym->flags & SYMBOL_DEF_AUTO) {
978 /*
979 * symbol has old and new value,
980 * so compare them...
981 */
982 switch (sym->type) {
983 case S_BOOLEAN:
984 case S_TRISTATE:
985 if (sym_get_tristate_value(sym) ==
986 sym->def[S_DEF_AUTO].tri)
987 continue;
988 break;
989 case S_STRING:
990 case S_HEX:
991 case S_INT:
992 if (!strcmp(sym_get_string_value(sym),
993 sym->def[S_DEF_AUTO].val))
994 continue;
995 break;
996 default:
997 break;
998 }
999 } else {
1000 /*
1001 * If there is no old value, only 'no' (unset)
1002 * is allowed as new value.
1003 */
1004 switch (sym->type) {
1005 case S_BOOLEAN:
1006 case S_TRISTATE:
1007 if (sym_get_tristate_value(sym) == no)
1008 continue;
1009 break;
1010 default:
1011 break;
1012 }
1013 }
1014 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1015 /* There is neither an old nor a new value. */
1016 continue;
1017 /* else
1018 * There is an old value, but no new value ('no' (unset)
1019 * isn't saved in auto.conf, so the old value is always
1020 * different from 'no').
1021 */
1022
1023 res = conf_touch_dep(sym->name);
1024 if (res)
1025 return res;
1026 }
1027
1028 return 0;
1029}
1030
1031static int __conf_write_autoconf(const char *filename,
1032 void (*print_symbol)(FILE *, struct symbol *),
1033 const struct comment_style *comment_style)
1034{
1035 char tmp[PATH_MAX];
1036 FILE *file;
1037 struct symbol *sym;
1038 int ret;
1039
1040 if (make_parent_dir(filename))
1041 return -1;
1042
1043 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1044 if (ret >= sizeof(tmp)) /* check truncation */
1045 return -1;
1046
1047 file = fopen(tmp, "w");
1048 if (!file) {
1049 perror("fopen");
1050 return -1;
1051 }
1052
1053 conf_write_heading(file, comment_style);
1054
1055 for_all_symbols(sym)
1056 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1057 print_symbol(file, sym);
1058
1059 fflush(file);
1060 /* check possible errors in conf_write_heading() and print_symbol() */
1061 ret = ferror(file);
1062 fclose(file);
1063 if (ret)
1064 return -1;
1065
1066 if (rename(tmp, filename)) {
1067 perror("rename");
1068 return -1;
1069 }
1070
1071 return 0;
1072}
1073
1074int conf_write_autoconf(int overwrite)
1075{
1076 struct symbol *sym;
1077 const char *autoconf_name = conf_get_autoconfig_name();
1078 int ret;
1079
1080 if (!overwrite && is_present(autoconf_name))
1081 return 0;
1082
1083 ret = conf_write_autoconf_cmd(autoconf_name);
1084 if (ret)
1085 return -1;
1086
1087 if (conf_touch_deps())
1088 return 1;
1089
1090 for_all_symbols(sym)
1091 sym_calc_value(sym);
1092
1093 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1094 print_symbol_for_c,
1095 &comment_style_c);
1096 if (ret)
1097 return ret;
1098
1099 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1100 print_symbol_for_rustccfg,
1101 NULL);
1102 if (ret)
1103 return ret;
1104
1105 /*
1106 * Create include/config/auto.conf. This must be the last step because
1107 * Kbuild has a dependency on auto.conf and this marks the successful
1108 * completion of the previous steps.
1109 */
1110 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1111 print_symbol_for_autoconf,
1112 &comment_style_pound);
1113 if (ret)
1114 return ret;
1115
1116 return 0;
1117}
1118
1119static bool conf_changed;
1120static void (*conf_changed_callback)(bool);
1121
1122void conf_set_changed(bool val)
1123{
1124 if (conf_changed_callback && conf_changed != val)
1125 conf_changed_callback(val);
1126
1127 conf_changed = val;
1128}
1129
1130bool conf_get_changed(void)
1131{
1132 return conf_changed;
1133}
1134
1135void conf_set_changed_callback(void (*fn)(bool))
1136{
1137 conf_changed_callback = fn;
1138}
1/*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6#include <sys/stat.h>
7#include <ctype.h>
8#include <errno.h>
9#include <fcntl.h>
10#include <stdarg.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <time.h>
15#include <unistd.h>
16
17#include "lkc.h"
18
19static void conf_warning(const char *fmt, ...)
20 __attribute__ ((format (printf, 1, 2)));
21
22static void conf_message(const char *fmt, ...)
23 __attribute__ ((format (printf, 1, 2)));
24
25static const char *conf_filename;
26static int conf_lineno, conf_warnings, conf_unsaved;
27
28const char conf_defname[] = "arch/$ARCH/defconfig";
29
30static void conf_warning(const char *fmt, ...)
31{
32 va_list ap;
33 va_start(ap, fmt);
34 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
35 vfprintf(stderr, fmt, ap);
36 fprintf(stderr, "\n");
37 va_end(ap);
38 conf_warnings++;
39}
40
41static void conf_default_message_callback(const char *fmt, va_list ap)
42{
43 printf("#\n# ");
44 vprintf(fmt, ap);
45 printf("\n#\n");
46}
47
48static void (*conf_message_callback) (const char *fmt, va_list ap) =
49 conf_default_message_callback;
50void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
51{
52 conf_message_callback = fn;
53}
54
55static void conf_message(const char *fmt, ...)
56{
57 va_list ap;
58
59 va_start(ap, fmt);
60 if (conf_message_callback)
61 conf_message_callback(fmt, ap);
62}
63
64const char *conf_get_configname(void)
65{
66 char *name = getenv("KCONFIG_CONFIG");
67
68 return name ? name : ".config";
69}
70
71const char *conf_get_autoconfig_name(void)
72{
73 char *name = getenv("KCONFIG_AUTOCONFIG");
74
75 return name ? name : "include/config/auto.conf";
76}
77
78static char *conf_expand_value(const char *in)
79{
80 struct symbol *sym;
81 const char *src;
82 static char res_value[SYMBOL_MAXLENGTH];
83 char *dst, name[SYMBOL_MAXLENGTH];
84
85 res_value[0] = 0;
86 dst = name;
87 while ((src = strchr(in, '$'))) {
88 strncat(res_value, in, src - in);
89 src++;
90 dst = name;
91 while (isalnum(*src) || *src == '_')
92 *dst++ = *src++;
93 *dst = 0;
94 sym = sym_lookup(name, 0);
95 sym_calc_value(sym);
96 strcat(res_value, sym_get_string_value(sym));
97 in = src;
98 }
99 strcat(res_value, in);
100
101 return res_value;
102}
103
104char *conf_get_default_confname(void)
105{
106 struct stat buf;
107 static char fullname[PATH_MAX+1];
108 char *env, *name;
109
110 name = conf_expand_value(conf_defname);
111 env = getenv(SRCTREE);
112 if (env) {
113 sprintf(fullname, "%s/%s", env, name);
114 if (!stat(fullname, &buf))
115 return fullname;
116 }
117 return name;
118}
119
120static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
121{
122 char *p2;
123
124 switch (sym->type) {
125 case S_TRISTATE:
126 if (p[0] == 'm') {
127 sym->def[def].tri = mod;
128 sym->flags |= def_flags;
129 break;
130 }
131 /* fall through */
132 case S_BOOLEAN:
133 if (p[0] == 'y') {
134 sym->def[def].tri = yes;
135 sym->flags |= def_flags;
136 break;
137 }
138 if (p[0] == 'n') {
139 sym->def[def].tri = no;
140 sym->flags |= def_flags;
141 break;
142 }
143 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
144 return 1;
145 case S_OTHER:
146 if (*p != '"') {
147 for (p2 = p; *p2 && !isspace(*p2); p2++)
148 ;
149 sym->type = S_STRING;
150 goto done;
151 }
152 /* fall through */
153 case S_STRING:
154 if (*p++ != '"')
155 break;
156 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
157 if (*p2 == '"') {
158 *p2 = 0;
159 break;
160 }
161 memmove(p2, p2 + 1, strlen(p2));
162 }
163 if (!p2) {
164 conf_warning("invalid string found");
165 return 1;
166 }
167 /* fall through */
168 case S_INT:
169 case S_HEX:
170 done:
171 if (sym_string_valid(sym, p)) {
172 sym->def[def].val = strdup(p);
173 sym->flags |= def_flags;
174 } else {
175 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
176 return 1;
177 }
178 break;
179 default:
180 ;
181 }
182 return 0;
183}
184
185int conf_read_simple(const char *name, int def)
186{
187 FILE *in = NULL;
188 char line[1024];
189 char *p, *p2;
190 struct symbol *sym;
191 int i, def_flags;
192
193 if (name) {
194 in = zconf_fopen(name);
195 } else {
196 struct property *prop;
197
198 name = conf_get_configname();
199 in = zconf_fopen(name);
200 if (in)
201 goto load;
202 sym_add_change_count(1);
203 if (!sym_defconfig_list) {
204 if (modules_sym)
205 sym_calc_value(modules_sym);
206 return 1;
207 }
208
209 for_all_defaults(sym_defconfig_list, prop) {
210 if (expr_calc_value(prop->visible.expr) == no ||
211 prop->expr->type != E_SYMBOL)
212 continue;
213 name = conf_expand_value(prop->expr->left.sym->name);
214 in = zconf_fopen(name);
215 if (in) {
216 conf_message(_("using defaults found in %s"),
217 name);
218 goto load;
219 }
220 }
221 }
222 if (!in)
223 return 1;
224
225load:
226 conf_filename = name;
227 conf_lineno = 0;
228 conf_warnings = 0;
229 conf_unsaved = 0;
230
231 def_flags = SYMBOL_DEF << def;
232 for_all_symbols(i, sym) {
233 sym->flags |= SYMBOL_CHANGED;
234 sym->flags &= ~(def_flags|SYMBOL_VALID);
235 if (sym_is_choice(sym))
236 sym->flags |= def_flags;
237 switch (sym->type) {
238 case S_INT:
239 case S_HEX:
240 case S_STRING:
241 if (sym->def[def].val)
242 free(sym->def[def].val);
243 /* fall through */
244 default:
245 sym->def[def].val = NULL;
246 sym->def[def].tri = no;
247 }
248 }
249
250 while (fgets(line, sizeof(line), in)) {
251 conf_lineno++;
252 sym = NULL;
253 if (line[0] == '#') {
254 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
255 continue;
256 p = strchr(line + 2 + strlen(CONFIG_), ' ');
257 if (!p)
258 continue;
259 *p++ = 0;
260 if (strncmp(p, "is not set", 10))
261 continue;
262 if (def == S_DEF_USER) {
263 sym = sym_find(line + 2 + strlen(CONFIG_));
264 if (!sym) {
265 sym_add_change_count(1);
266 goto setsym;
267 }
268 } else {
269 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
270 if (sym->type == S_UNKNOWN)
271 sym->type = S_BOOLEAN;
272 }
273 if (sym->flags & def_flags) {
274 conf_warning("override: reassigning to symbol %s", sym->name);
275 }
276 switch (sym->type) {
277 case S_BOOLEAN:
278 case S_TRISTATE:
279 sym->def[def].tri = no;
280 sym->flags |= def_flags;
281 break;
282 default:
283 ;
284 }
285 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
286 p = strchr(line + strlen(CONFIG_), '=');
287 if (!p)
288 continue;
289 *p++ = 0;
290 p2 = strchr(p, '\n');
291 if (p2) {
292 *p2-- = 0;
293 if (*p2 == '\r')
294 *p2 = 0;
295 }
296 if (def == S_DEF_USER) {
297 sym = sym_find(line + strlen(CONFIG_));
298 if (!sym) {
299 sym_add_change_count(1);
300 goto setsym;
301 }
302 } else {
303 sym = sym_lookup(line + strlen(CONFIG_), 0);
304 if (sym->type == S_UNKNOWN)
305 sym->type = S_OTHER;
306 }
307 if (sym->flags & def_flags) {
308 conf_warning("override: reassigning to symbol %s", sym->name);
309 }
310 if (conf_set_sym_val(sym, def, def_flags, p))
311 continue;
312 } else {
313 if (line[0] != '\r' && line[0] != '\n')
314 conf_warning("unexpected data");
315 continue;
316 }
317setsym:
318 if (sym && sym_is_choice_value(sym)) {
319 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
320 switch (sym->def[def].tri) {
321 case no:
322 break;
323 case mod:
324 if (cs->def[def].tri == yes) {
325 conf_warning("%s creates inconsistent choice state", sym->name);
326 cs->flags &= ~def_flags;
327 }
328 break;
329 case yes:
330 if (cs->def[def].tri != no)
331 conf_warning("override: %s changes choice state", sym->name);
332 cs->def[def].val = sym;
333 break;
334 }
335 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
336 }
337 }
338 fclose(in);
339
340 if (modules_sym)
341 sym_calc_value(modules_sym);
342 return 0;
343}
344
345int conf_read(const char *name)
346{
347 struct symbol *sym, *choice_sym;
348 struct property *prop;
349 struct expr *e;
350 int i, flags;
351
352 sym_set_change_count(0);
353
354 if (conf_read_simple(name, S_DEF_USER))
355 return 1;
356
357 for_all_symbols(i, sym) {
358 sym_calc_value(sym);
359 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
360 goto sym_ok;
361 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
362 /* check that calculated value agrees with saved value */
363 switch (sym->type) {
364 case S_BOOLEAN:
365 case S_TRISTATE:
366 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
367 break;
368 if (!sym_is_choice(sym))
369 goto sym_ok;
370 /* fall through */
371 default:
372 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
373 goto sym_ok;
374 break;
375 }
376 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
377 /* no previous value and not saved */
378 goto sym_ok;
379 conf_unsaved++;
380 /* maybe print value in verbose mode... */
381 sym_ok:
382 if (!sym_is_choice(sym))
383 continue;
384 /* The choice symbol only has a set value (and thus is not new)
385 * if all its visible childs have values.
386 */
387 prop = sym_get_choice_prop(sym);
388 flags = sym->flags;
389 expr_list_for_each_sym(prop->expr, e, choice_sym)
390 if (choice_sym->visible != no)
391 flags &= choice_sym->flags;
392 sym->flags &= flags | ~SYMBOL_DEF_USER;
393 }
394
395 for_all_symbols(i, sym) {
396 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
397 /* Reset values of generates values, so they'll appear
398 * as new, if they should become visible, but that
399 * doesn't quite work if the Kconfig and the saved
400 * configuration disagree.
401 */
402 if (sym->visible == no && !conf_unsaved)
403 sym->flags &= ~SYMBOL_DEF_USER;
404 switch (sym->type) {
405 case S_STRING:
406 case S_INT:
407 case S_HEX:
408 /* Reset a string value if it's out of range */
409 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
410 break;
411 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
412 conf_unsaved++;
413 break;
414 default:
415 break;
416 }
417 }
418 }
419
420 sym_add_change_count(conf_warnings || conf_unsaved);
421
422 return 0;
423}
424
425/*
426 * Kconfig configuration printer
427 *
428 * This printer is used when generating the resulting configuration after
429 * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
430 * passing a non-NULL argument to the printer.
431 *
432 */
433static void
434kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
435{
436
437 switch (sym->type) {
438 case S_BOOLEAN:
439 case S_TRISTATE:
440 if (*value == 'n') {
441 bool skip_unset = (arg != NULL);
442
443 if (!skip_unset)
444 fprintf(fp, "# %s%s is not set\n",
445 CONFIG_, sym->name);
446 return;
447 }
448 break;
449 default:
450 break;
451 }
452
453 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
454}
455
456static void
457kconfig_print_comment(FILE *fp, const char *value, void *arg)
458{
459 const char *p = value;
460 size_t l;
461
462 for (;;) {
463 l = strcspn(p, "\n");
464 fprintf(fp, "#");
465 if (l) {
466 fprintf(fp, " ");
467 fwrite(p, l, 1, fp);
468 p += l;
469 }
470 fprintf(fp, "\n");
471 if (*p++ == '\0')
472 break;
473 }
474}
475
476static struct conf_printer kconfig_printer_cb =
477{
478 .print_symbol = kconfig_print_symbol,
479 .print_comment = kconfig_print_comment,
480};
481
482/*
483 * Header printer
484 *
485 * This printer is used when generating the `include/generated/autoconf.h' file.
486 */
487static void
488header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
489{
490
491 switch (sym->type) {
492 case S_BOOLEAN:
493 case S_TRISTATE: {
494 const char *suffix = "";
495
496 switch (*value) {
497 case 'n':
498 break;
499 case 'm':
500 suffix = "_MODULE";
501 /* fall through */
502 default:
503 fprintf(fp, "#define %s%s%s 1\n",
504 CONFIG_, sym->name, suffix);
505 }
506 /*
507 * Generate the __enabled_CONFIG_* and
508 * __enabled_CONFIG_*_MODULE macros for use by the
509 * IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
510 * generated even for booleans so that the IS_ENABLED() macro
511 * works.
512 */
513 fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
514 sym->name, (*value == 'y'));
515 fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
516 sym->name, (*value == 'm'));
517 break;
518 }
519 case S_HEX: {
520 const char *prefix = "";
521
522 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
523 prefix = "0x";
524 fprintf(fp, "#define %s%s %s%s\n",
525 CONFIG_, sym->name, prefix, value);
526 break;
527 }
528 case S_STRING:
529 case S_INT:
530 fprintf(fp, "#define %s%s %s\n",
531 CONFIG_, sym->name, value);
532 break;
533 default:
534 break;
535 }
536
537}
538
539static void
540header_print_comment(FILE *fp, const char *value, void *arg)
541{
542 const char *p = value;
543 size_t l;
544
545 fprintf(fp, "/*\n");
546 for (;;) {
547 l = strcspn(p, "\n");
548 fprintf(fp, " *");
549 if (l) {
550 fprintf(fp, " ");
551 fwrite(p, l, 1, fp);
552 p += l;
553 }
554 fprintf(fp, "\n");
555 if (*p++ == '\0')
556 break;
557 }
558 fprintf(fp, " */\n");
559}
560
561static struct conf_printer header_printer_cb =
562{
563 .print_symbol = header_print_symbol,
564 .print_comment = header_print_comment,
565};
566
567/*
568 * Tristate printer
569 *
570 * This printer is used when generating the `include/config/tristate.conf' file.
571 */
572static void
573tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
574{
575
576 if (sym->type == S_TRISTATE && *value != 'n')
577 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
578}
579
580static struct conf_printer tristate_printer_cb =
581{
582 .print_symbol = tristate_print_symbol,
583 .print_comment = kconfig_print_comment,
584};
585
586static void conf_write_symbol(FILE *fp, struct symbol *sym,
587 struct conf_printer *printer, void *printer_arg)
588{
589 const char *str;
590
591 switch (sym->type) {
592 case S_OTHER:
593 case S_UNKNOWN:
594 break;
595 case S_STRING:
596 str = sym_get_string_value(sym);
597 str = sym_escape_string_value(str);
598 printer->print_symbol(fp, sym, str, printer_arg);
599 free((void *)str);
600 break;
601 default:
602 str = sym_get_string_value(sym);
603 printer->print_symbol(fp, sym, str, printer_arg);
604 }
605}
606
607static void
608conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
609{
610 char buf[256];
611
612 snprintf(buf, sizeof(buf),
613 "\n"
614 "Automatically generated file; DO NOT EDIT.\n"
615 "%s\n",
616 rootmenu.prompt->text);
617
618 printer->print_comment(fp, buf, printer_arg);
619}
620
621/*
622 * Write out a minimal config.
623 * All values that has default values are skipped as this is redundant.
624 */
625int conf_write_defconfig(const char *filename)
626{
627 struct symbol *sym;
628 struct menu *menu;
629 FILE *out;
630
631 out = fopen(filename, "w");
632 if (!out)
633 return 1;
634
635 sym_clear_all_valid();
636
637 /* Traverse all menus to find all relevant symbols */
638 menu = rootmenu.list;
639
640 while (menu != NULL)
641 {
642 sym = menu->sym;
643 if (sym == NULL) {
644 if (!menu_is_visible(menu))
645 goto next_menu;
646 } else if (!sym_is_choice(sym)) {
647 sym_calc_value(sym);
648 if (!(sym->flags & SYMBOL_WRITE))
649 goto next_menu;
650 sym->flags &= ~SYMBOL_WRITE;
651 /* If we cannot change the symbol - skip */
652 if (!sym_is_changable(sym))
653 goto next_menu;
654 /* If symbol equals to default value - skip */
655 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
656 goto next_menu;
657
658 /*
659 * If symbol is a choice value and equals to the
660 * default for a choice - skip.
661 * But only if value is bool and equal to "y" and
662 * choice is not "optional".
663 * (If choice is "optional" then all values can be "n")
664 */
665 if (sym_is_choice_value(sym)) {
666 struct symbol *cs;
667 struct symbol *ds;
668
669 cs = prop_get_symbol(sym_get_choice_prop(sym));
670 ds = sym_choice_default(cs);
671 if (!sym_is_optional(cs) && sym == ds) {
672 if ((sym->type == S_BOOLEAN) &&
673 sym_get_tristate_value(sym) == yes)
674 goto next_menu;
675 }
676 }
677 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
678 }
679next_menu:
680 if (menu->list != NULL) {
681 menu = menu->list;
682 }
683 else if (menu->next != NULL) {
684 menu = menu->next;
685 } else {
686 while ((menu = menu->parent)) {
687 if (menu->next != NULL) {
688 menu = menu->next;
689 break;
690 }
691 }
692 }
693 }
694 fclose(out);
695 return 0;
696}
697
698int conf_write(const char *name)
699{
700 FILE *out;
701 struct symbol *sym;
702 struct menu *menu;
703 const char *basename;
704 const char *str;
705 char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
706 char *env;
707
708 dirname[0] = 0;
709 if (name && name[0]) {
710 struct stat st;
711 char *slash;
712
713 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
714 strcpy(dirname, name);
715 strcat(dirname, "/");
716 basename = conf_get_configname();
717 } else if ((slash = strrchr(name, '/'))) {
718 int size = slash - name + 1;
719 memcpy(dirname, name, size);
720 dirname[size] = 0;
721 if (slash[1])
722 basename = slash + 1;
723 else
724 basename = conf_get_configname();
725 } else
726 basename = name;
727 } else
728 basename = conf_get_configname();
729
730 sprintf(newname, "%s%s", dirname, basename);
731 env = getenv("KCONFIG_OVERWRITECONFIG");
732 if (!env || !*env) {
733 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
734 out = fopen(tmpname, "w");
735 } else {
736 *tmpname = 0;
737 out = fopen(newname, "w");
738 }
739 if (!out)
740 return 1;
741
742 conf_write_heading(out, &kconfig_printer_cb, NULL);
743
744 if (!conf_get_changed())
745 sym_clear_all_valid();
746
747 menu = rootmenu.list;
748 while (menu) {
749 sym = menu->sym;
750 if (!sym) {
751 if (!menu_is_visible(menu))
752 goto next;
753 str = menu_get_prompt(menu);
754 fprintf(out, "\n"
755 "#\n"
756 "# %s\n"
757 "#\n", str);
758 } else if (!(sym->flags & SYMBOL_CHOICE)) {
759 sym_calc_value(sym);
760 if (!(sym->flags & SYMBOL_WRITE))
761 goto next;
762 sym->flags &= ~SYMBOL_WRITE;
763
764 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
765 }
766
767next:
768 if (menu->list) {
769 menu = menu->list;
770 continue;
771 }
772 if (menu->next)
773 menu = menu->next;
774 else while ((menu = menu->parent)) {
775 if (menu->next) {
776 menu = menu->next;
777 break;
778 }
779 }
780 }
781 fclose(out);
782
783 if (*tmpname) {
784 strcat(dirname, basename);
785 strcat(dirname, ".old");
786 rename(newname, dirname);
787 if (rename(tmpname, newname))
788 return 1;
789 }
790
791 conf_message(_("configuration written to %s"), newname);
792
793 sym_set_change_count(0);
794
795 return 0;
796}
797
798static int conf_split_config(void)
799{
800 const char *name;
801 char path[PATH_MAX+1];
802 char *s, *d, c;
803 struct symbol *sym;
804 struct stat sb;
805 int res, i, fd;
806
807 name = conf_get_autoconfig_name();
808 conf_read_simple(name, S_DEF_AUTO);
809
810 if (chdir("include/config"))
811 return 1;
812
813 res = 0;
814 for_all_symbols(i, sym) {
815 sym_calc_value(sym);
816 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
817 continue;
818 if (sym->flags & SYMBOL_WRITE) {
819 if (sym->flags & SYMBOL_DEF_AUTO) {
820 /*
821 * symbol has old and new value,
822 * so compare them...
823 */
824 switch (sym->type) {
825 case S_BOOLEAN:
826 case S_TRISTATE:
827 if (sym_get_tristate_value(sym) ==
828 sym->def[S_DEF_AUTO].tri)
829 continue;
830 break;
831 case S_STRING:
832 case S_HEX:
833 case S_INT:
834 if (!strcmp(sym_get_string_value(sym),
835 sym->def[S_DEF_AUTO].val))
836 continue;
837 break;
838 default:
839 break;
840 }
841 } else {
842 /*
843 * If there is no old value, only 'no' (unset)
844 * is allowed as new value.
845 */
846 switch (sym->type) {
847 case S_BOOLEAN:
848 case S_TRISTATE:
849 if (sym_get_tristate_value(sym) == no)
850 continue;
851 break;
852 default:
853 break;
854 }
855 }
856 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
857 /* There is neither an old nor a new value. */
858 continue;
859 /* else
860 * There is an old value, but no new value ('no' (unset)
861 * isn't saved in auto.conf, so the old value is always
862 * different from 'no').
863 */
864
865 /* Replace all '_' and append ".h" */
866 s = sym->name;
867 d = path;
868 while ((c = *s++)) {
869 c = tolower(c);
870 *d++ = (c == '_') ? '/' : c;
871 }
872 strcpy(d, ".h");
873
874 /* Assume directory path already exists. */
875 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
876 if (fd == -1) {
877 if (errno != ENOENT) {
878 res = 1;
879 break;
880 }
881 /*
882 * Create directory components,
883 * unless they exist already.
884 */
885 d = path;
886 while ((d = strchr(d, '/'))) {
887 *d = 0;
888 if (stat(path, &sb) && mkdir(path, 0755)) {
889 res = 1;
890 goto out;
891 }
892 *d++ = '/';
893 }
894 /* Try it again. */
895 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
896 if (fd == -1) {
897 res = 1;
898 break;
899 }
900 }
901 close(fd);
902 }
903out:
904 if (chdir("../.."))
905 return 1;
906
907 return res;
908}
909
910int conf_write_autoconf(void)
911{
912 struct symbol *sym;
913 const char *name;
914 FILE *out, *tristate, *out_h;
915 int i;
916
917 sym_clear_all_valid();
918
919 file_write_dep("include/config/auto.conf.cmd");
920
921 if (conf_split_config())
922 return 1;
923
924 out = fopen(".tmpconfig", "w");
925 if (!out)
926 return 1;
927
928 tristate = fopen(".tmpconfig_tristate", "w");
929 if (!tristate) {
930 fclose(out);
931 return 1;
932 }
933
934 out_h = fopen(".tmpconfig.h", "w");
935 if (!out_h) {
936 fclose(out);
937 fclose(tristate);
938 return 1;
939 }
940
941 conf_write_heading(out, &kconfig_printer_cb, NULL);
942
943 conf_write_heading(tristate, &tristate_printer_cb, NULL);
944
945 conf_write_heading(out_h, &header_printer_cb, NULL);
946
947 for_all_symbols(i, sym) {
948 sym_calc_value(sym);
949 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
950 continue;
951
952 /* write symbol to auto.conf, tristate and header files */
953 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
954
955 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
956
957 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
958 }
959 fclose(out);
960 fclose(tristate);
961 fclose(out_h);
962
963 name = getenv("KCONFIG_AUTOHEADER");
964 if (!name)
965 name = "include/generated/autoconf.h";
966 if (rename(".tmpconfig.h", name))
967 return 1;
968 name = getenv("KCONFIG_TRISTATE");
969 if (!name)
970 name = "include/config/tristate.conf";
971 if (rename(".tmpconfig_tristate", name))
972 return 1;
973 name = conf_get_autoconfig_name();
974 /*
975 * This must be the last step, kbuild has a dependency on auto.conf
976 * and this marks the successful completion of the previous steps.
977 */
978 if (rename(".tmpconfig", name))
979 return 1;
980
981 return 0;
982}
983
984static int sym_change_count;
985static void (*conf_changed_callback)(void);
986
987void sym_set_change_count(int count)
988{
989 int _sym_change_count = sym_change_count;
990 sym_change_count = count;
991 if (conf_changed_callback &&
992 (bool)_sym_change_count != (bool)count)
993 conf_changed_callback();
994}
995
996void sym_add_change_count(int count)
997{
998 sym_set_change_count(count + sym_change_count);
999}
1000
1001bool conf_get_changed(void)
1002{
1003 return sym_change_count;
1004}
1005
1006void conf_set_changed_callback(void (*fn)(void))
1007{
1008 conf_changed_callback = fn;
1009}
1010
1011static void randomize_choice_values(struct symbol *csym)
1012{
1013 struct property *prop;
1014 struct symbol *sym;
1015 struct expr *e;
1016 int cnt, def;
1017
1018 /*
1019 * If choice is mod then we may have more items selected
1020 * and if no then no-one.
1021 * In both cases stop.
1022 */
1023 if (csym->curr.tri != yes)
1024 return;
1025
1026 prop = sym_get_choice_prop(csym);
1027
1028 /* count entries in choice block */
1029 cnt = 0;
1030 expr_list_for_each_sym(prop->expr, e, sym)
1031 cnt++;
1032
1033 /*
1034 * find a random value and set it to yes,
1035 * set the rest to no so we have only one set
1036 */
1037 def = (rand() % cnt);
1038
1039 cnt = 0;
1040 expr_list_for_each_sym(prop->expr, e, sym) {
1041 if (def == cnt++) {
1042 sym->def[S_DEF_USER].tri = yes;
1043 csym->def[S_DEF_USER].val = sym;
1044 }
1045 else {
1046 sym->def[S_DEF_USER].tri = no;
1047 }
1048 }
1049 csym->flags |= SYMBOL_DEF_USER;
1050 /* clear VALID to get value calculated */
1051 csym->flags &= ~(SYMBOL_VALID);
1052}
1053
1054static void set_all_choice_values(struct symbol *csym)
1055{
1056 struct property *prop;
1057 struct symbol *sym;
1058 struct expr *e;
1059
1060 prop = sym_get_choice_prop(csym);
1061
1062 /*
1063 * Set all non-assinged choice values to no
1064 */
1065 expr_list_for_each_sym(prop->expr, e, sym) {
1066 if (!sym_has_value(sym))
1067 sym->def[S_DEF_USER].tri = no;
1068 }
1069 csym->flags |= SYMBOL_DEF_USER;
1070 /* clear VALID to get value calculated */
1071 csym->flags &= ~(SYMBOL_VALID);
1072}
1073
1074void conf_set_all_new_symbols(enum conf_def_mode mode)
1075{
1076 struct symbol *sym, *csym;
1077 int i, cnt;
1078
1079 for_all_symbols(i, sym) {
1080 if (sym_has_value(sym))
1081 continue;
1082 switch (sym_get_type(sym)) {
1083 case S_BOOLEAN:
1084 case S_TRISTATE:
1085 switch (mode) {
1086 case def_yes:
1087 sym->def[S_DEF_USER].tri = yes;
1088 break;
1089 case def_mod:
1090 sym->def[S_DEF_USER].tri = mod;
1091 break;
1092 case def_no:
1093 sym->def[S_DEF_USER].tri = no;
1094 break;
1095 case def_random:
1096 cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
1097 sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1098 break;
1099 default:
1100 continue;
1101 }
1102 if (!(sym_is_choice(sym) && mode == def_random))
1103 sym->flags |= SYMBOL_DEF_USER;
1104 break;
1105 default:
1106 break;
1107 }
1108
1109 }
1110
1111 sym_clear_all_valid();
1112
1113 /*
1114 * We have different type of choice blocks.
1115 * If curr.tri equals to mod then we can select several
1116 * choice symbols in one block.
1117 * In this case we do nothing.
1118 * If curr.tri equals yes then only one symbol can be
1119 * selected in a choice block and we set it to yes,
1120 * and the rest to no.
1121 */
1122 for_all_symbols(i, csym) {
1123 if (sym_has_value(csym) || !sym_is_choice(csym))
1124 continue;
1125
1126 sym_calc_value(csym);
1127 if (mode == def_random)
1128 randomize_choice_values(csym);
1129 else
1130 set_all_choice_values(csym);
1131 }
1132}