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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <ctype.h>
10#include <errno.h>
11#include <fcntl.h>
12#include <limits.h>
13#include <stdarg.h>
14#include <stdbool.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <string.h>
18#include <time.h>
19#include <unistd.h>
20
21#include "lkc.h"
22
23/* return true if 'path' exists, false otherwise */
24static bool is_present(const char *path)
25{
26 struct stat st;
27
28 return !stat(path, &st);
29}
30
31/* return true if 'path' exists and it is a directory, false otherwise */
32static bool is_dir(const char *path)
33{
34 struct stat st;
35
36 if (stat(path, &st))
37 return false;
38
39 return S_ISDIR(st.st_mode);
40}
41
42/* return true if the given two files are the same, false otherwise */
43static bool is_same(const char *file1, const char *file2)
44{
45 int fd1, fd2;
46 struct stat st1, st2;
47 void *map1, *map2;
48 bool ret = false;
49
50 fd1 = open(file1, O_RDONLY);
51 if (fd1 < 0)
52 return ret;
53
54 fd2 = open(file2, O_RDONLY);
55 if (fd2 < 0)
56 goto close1;
57
58 ret = fstat(fd1, &st1);
59 if (ret)
60 goto close2;
61 ret = fstat(fd2, &st2);
62 if (ret)
63 goto close2;
64
65 if (st1.st_size != st2.st_size)
66 goto close2;
67
68 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
69 if (map1 == MAP_FAILED)
70 goto close2;
71
72 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
73 if (map2 == MAP_FAILED)
74 goto close2;
75
76 if (bcmp(map1, map2, st1.st_size))
77 goto close2;
78
79 ret = true;
80close2:
81 close(fd2);
82close1:
83 close(fd1);
84
85 return ret;
86}
87
88/*
89 * Create the parent directory of the given path.
90 *
91 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
92 */
93static int make_parent_dir(const char *path)
94{
95 char tmp[PATH_MAX + 1];
96 char *p;
97
98 strncpy(tmp, path, sizeof(tmp));
99 tmp[sizeof(tmp) - 1] = 0;
100
101 /* Remove the base name. Just return if nothing is left */
102 p = strrchr(tmp, '/');
103 if (!p)
104 return 0;
105 *(p + 1) = 0;
106
107 /* Just in case it is an absolute path */
108 p = tmp;
109 while (*p == '/')
110 p++;
111
112 while ((p = strchr(p, '/'))) {
113 *p = 0;
114
115 /* skip if the directory exists */
116 if (!is_dir(tmp) && mkdir(tmp, 0755))
117 return -1;
118
119 *p = '/';
120 while (*p == '/')
121 p++;
122 }
123
124 return 0;
125}
126
127static char depfile_path[PATH_MAX];
128static size_t depfile_prefix_len;
129
130/* touch depfile for symbol 'name' */
131static int conf_touch_dep(const char *name)
132{
133 int fd;
134
135 /* check overflow: prefix + name + '\0' must fit in buffer. */
136 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
137 return -1;
138
139 strcpy(depfile_path + depfile_prefix_len, name);
140
141 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
142 if (fd == -1)
143 return -1;
144 close(fd);
145
146 return 0;
147}
148
149static void conf_warning(const char *fmt, ...)
150 __attribute__ ((format (printf, 1, 2)));
151
152static void conf_message(const char *fmt, ...)
153 __attribute__ ((format (printf, 1, 2)));
154
155static const char *conf_filename;
156static int conf_lineno, conf_warnings;
157
158bool conf_errors(void)
159{
160 if (conf_warnings)
161 return getenv("KCONFIG_WERROR");
162 return false;
163}
164
165static void conf_warning(const char *fmt, ...)
166{
167 va_list ap;
168 va_start(ap, fmt);
169 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
170 vfprintf(stderr, fmt, ap);
171 fprintf(stderr, "\n");
172 va_end(ap);
173 conf_warnings++;
174}
175
176static void conf_default_message_callback(const char *s)
177{
178 printf("#\n# ");
179 printf("%s", s);
180 printf("\n#\n");
181}
182
183static void (*conf_message_callback)(const char *s) =
184 conf_default_message_callback;
185void conf_set_message_callback(void (*fn)(const char *s))
186{
187 conf_message_callback = fn;
188}
189
190static void conf_message(const char *fmt, ...)
191{
192 va_list ap;
193 char buf[4096];
194
195 if (!conf_message_callback)
196 return;
197
198 va_start(ap, fmt);
199
200 vsnprintf(buf, sizeof(buf), fmt, ap);
201 conf_message_callback(buf);
202 va_end(ap);
203}
204
205const char *conf_get_configname(void)
206{
207 char *name = getenv("KCONFIG_CONFIG");
208
209 return name ? name : ".config";
210}
211
212static const char *conf_get_autoconfig_name(void)
213{
214 char *name = getenv("KCONFIG_AUTOCONFIG");
215
216 return name ? name : "include/config/auto.conf";
217}
218
219static const char *conf_get_autoheader_name(void)
220{
221 char *name = getenv("KCONFIG_AUTOHEADER");
222
223 return name ? name : "include/generated/autoconf.h";
224}
225
226static const char *conf_get_rustccfg_name(void)
227{
228 char *name = getenv("KCONFIG_RUSTCCFG");
229
230 return name ? name : "include/generated/rustc_cfg";
231}
232
233static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
234{
235 char *p2;
236
237 switch (sym->type) {
238 case S_TRISTATE:
239 if (p[0] == 'm') {
240 sym->def[def].tri = mod;
241 sym->flags |= def_flags;
242 break;
243 }
244 /* fall through */
245 case S_BOOLEAN:
246 if (p[0] == 'y') {
247 sym->def[def].tri = yes;
248 sym->flags |= def_flags;
249 break;
250 }
251 if (p[0] == 'n') {
252 sym->def[def].tri = no;
253 sym->flags |= def_flags;
254 break;
255 }
256 if (def != S_DEF_AUTO)
257 conf_warning("symbol value '%s' invalid for %s",
258 p, sym->name);
259 return 1;
260 case S_STRING:
261 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
262 if (def != S_DEF_AUTO) {
263 if (*p++ != '"')
264 break;
265 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
266 if (*p2 == '"') {
267 *p2 = 0;
268 break;
269 }
270 memmove(p2, p2 + 1, strlen(p2));
271 }
272 if (!p2) {
273 conf_warning("invalid string found");
274 return 1;
275 }
276 }
277 /* fall through */
278 case S_INT:
279 case S_HEX:
280 if (sym_string_valid(sym, p)) {
281 sym->def[def].val = xstrdup(p);
282 sym->flags |= def_flags;
283 } else {
284 if (def != S_DEF_AUTO)
285 conf_warning("symbol value '%s' invalid for %s",
286 p, sym->name);
287 return 1;
288 }
289 break;
290 default:
291 ;
292 }
293 return 0;
294}
295
296#define LINE_GROWTH 16
297static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
298{
299 size_t new_size = slen + 1;
300
301 if (new_size > *n) {
302 new_size += LINE_GROWTH - 1;
303 new_size *= 2;
304 *lineptr = xrealloc(*lineptr, new_size);
305 *n = new_size;
306 }
307
308 (*lineptr)[slen] = c;
309
310 return 0;
311}
312
313static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
314{
315 char *line = *lineptr;
316 size_t slen = 0;
317
318 for (;;) {
319 int c = getc(stream);
320
321 switch (c) {
322 case '\n':
323 if (add_byte(c, &line, slen, n) < 0)
324 goto e_out;
325 slen++;
326 /* fall through */
327 case EOF:
328 if (add_byte('\0', &line, slen, n) < 0)
329 goto e_out;
330 *lineptr = line;
331 if (slen == 0)
332 return -1;
333 return slen;
334 default:
335 if (add_byte(c, &line, slen, n) < 0)
336 goto e_out;
337 slen++;
338 }
339 }
340
341e_out:
342 line[slen-1] = '\0';
343 *lineptr = line;
344 return -1;
345}
346
347/* like getline(), but the newline character is stripped away */
348static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
349{
350 ssize_t len;
351
352 len = compat_getline(lineptr, n, stream);
353
354 if (len > 0 && (*lineptr)[len - 1] == '\n') {
355 len--;
356 (*lineptr)[len] = '\0';
357
358 if (len > 0 && (*lineptr)[len - 1] == '\r') {
359 len--;
360 (*lineptr)[len] = '\0';
361 }
362 }
363
364 return len;
365}
366
367int conf_read_simple(const char *name, int def)
368{
369 FILE *in = NULL;
370 char *line = NULL;
371 size_t line_asize = 0;
372 char *p, *val;
373 struct symbol *sym;
374 int i, def_flags;
375 const char *warn_unknown, *sym_name;
376
377 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
378 if (name) {
379 in = zconf_fopen(name);
380 } else {
381 char *env;
382
383 name = conf_get_configname();
384 in = zconf_fopen(name);
385 if (in)
386 goto load;
387 conf_set_changed(true);
388
389 env = getenv("KCONFIG_DEFCONFIG_LIST");
390 if (!env)
391 return 1;
392
393 while (1) {
394 bool is_last;
395
396 while (isspace(*env))
397 env++;
398
399 if (!*env)
400 break;
401
402 p = env;
403 while (*p && !isspace(*p))
404 p++;
405
406 is_last = (*p == '\0');
407
408 *p = '\0';
409
410 in = zconf_fopen(env);
411 if (in) {
412 conf_message("using defaults found in %s",
413 env);
414 goto load;
415 }
416
417 if (is_last)
418 break;
419
420 env = p + 1;
421 }
422 }
423 if (!in)
424 return 1;
425
426load:
427 conf_filename = name;
428 conf_lineno = 0;
429 conf_warnings = 0;
430
431 def_flags = SYMBOL_DEF << def;
432 for_all_symbols(i, sym) {
433 sym->flags |= SYMBOL_CHANGED;
434 sym->flags &= ~(def_flags|SYMBOL_VALID);
435 if (sym_is_choice(sym))
436 sym->flags |= def_flags;
437 switch (sym->type) {
438 case S_INT:
439 case S_HEX:
440 case S_STRING:
441 free(sym->def[def].val);
442 /* fall through */
443 default:
444 sym->def[def].val = NULL;
445 sym->def[def].tri = no;
446 }
447 }
448
449 while (getline_stripped(&line, &line_asize, in) != -1) {
450 conf_lineno++;
451
452 if (!line[0]) /* blank line */
453 continue;
454
455 if (line[0] == '#') {
456 if (line[1] != ' ')
457 continue;
458 p = line + 2;
459 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
460 continue;
461 sym_name = p + strlen(CONFIG_);
462 p = strchr(sym_name, ' ');
463 if (!p)
464 continue;
465 *p++ = 0;
466 if (strcmp(p, "is not set"))
467 continue;
468
469 val = "n";
470 } else {
471 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
472 conf_warning("unexpected data: %s", line);
473 continue;
474 }
475
476 sym_name = line + strlen(CONFIG_);
477 p = strchr(sym_name, '=');
478 if (!p) {
479 conf_warning("unexpected data: %s", line);
480 continue;
481 }
482 *p = 0;
483 val = p + 1;
484 }
485
486 sym = sym_find(sym_name);
487 if (!sym) {
488 if (def == S_DEF_AUTO) {
489 /*
490 * Reading from include/config/auto.conf.
491 * If CONFIG_FOO previously existed in auto.conf
492 * but it is missing now, include/config/FOO
493 * must be touched.
494 */
495 conf_touch_dep(sym_name);
496 } else {
497 if (warn_unknown)
498 conf_warning("unknown symbol: %s", sym_name);
499
500 conf_set_changed(true);
501 }
502 continue;
503 }
504
505 if (sym->flags & def_flags)
506 conf_warning("override: reassigning to symbol %s", sym->name);
507
508 if (conf_set_sym_val(sym, def, def_flags, val))
509 continue;
510
511 if (sym && sym_is_choice_value(sym)) {
512 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
513 switch (sym->def[def].tri) {
514 case no:
515 break;
516 case mod:
517 if (cs->def[def].tri == yes) {
518 conf_warning("%s creates inconsistent choice state", sym->name);
519 cs->flags &= ~def_flags;
520 }
521 break;
522 case yes:
523 if (cs->def[def].tri != no)
524 conf_warning("override: %s changes choice state", sym->name);
525 cs->def[def].val = sym;
526 break;
527 }
528 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
529 }
530 }
531 free(line);
532 fclose(in);
533
534 return 0;
535}
536
537int conf_read(const char *name)
538{
539 struct symbol *sym;
540 int conf_unsaved = 0;
541 int i;
542
543 conf_set_changed(false);
544
545 if (conf_read_simple(name, S_DEF_USER)) {
546 sym_calc_value(modules_sym);
547 return 1;
548 }
549
550 sym_calc_value(modules_sym);
551
552 for_all_symbols(i, sym) {
553 sym_calc_value(sym);
554 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
555 continue;
556 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
557 /* check that calculated value agrees with saved value */
558 switch (sym->type) {
559 case S_BOOLEAN:
560 case S_TRISTATE:
561 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
562 continue;
563 break;
564 default:
565 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
566 continue;
567 break;
568 }
569 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
570 /* no previous value and not saved */
571 continue;
572 conf_unsaved++;
573 /* maybe print value in verbose mode... */
574 }
575
576 for_all_symbols(i, sym) {
577 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
578 /* Reset values of generates values, so they'll appear
579 * as new, if they should become visible, but that
580 * doesn't quite work if the Kconfig and the saved
581 * configuration disagree.
582 */
583 if (sym->visible == no && !conf_unsaved)
584 sym->flags &= ~SYMBOL_DEF_USER;
585 switch (sym->type) {
586 case S_STRING:
587 case S_INT:
588 case S_HEX:
589 /* Reset a string value if it's out of range */
590 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
591 break;
592 sym->flags &= ~SYMBOL_VALID;
593 conf_unsaved++;
594 break;
595 default:
596 break;
597 }
598 }
599 }
600
601 if (conf_warnings || conf_unsaved)
602 conf_set_changed(true);
603
604 return 0;
605}
606
607struct comment_style {
608 const char *decoration;
609 const char *prefix;
610 const char *postfix;
611};
612
613static const struct comment_style comment_style_pound = {
614 .decoration = "#",
615 .prefix = "#",
616 .postfix = "#",
617};
618
619static const struct comment_style comment_style_c = {
620 .decoration = " *",
621 .prefix = "/*",
622 .postfix = " */",
623};
624
625static void conf_write_heading(FILE *fp, const struct comment_style *cs)
626{
627 if (!cs)
628 return;
629
630 fprintf(fp, "%s\n", cs->prefix);
631
632 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
633 cs->decoration);
634
635 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
636
637 fprintf(fp, "%s\n", cs->postfix);
638}
639
640/* The returned pointer must be freed on the caller side */
641static char *escape_string_value(const char *in)
642{
643 const char *p;
644 char *out;
645 size_t len;
646
647 len = strlen(in) + strlen("\"\"") + 1;
648
649 p = in;
650 while (1) {
651 p += strcspn(p, "\"\\");
652
653 if (p[0] == '\0')
654 break;
655
656 len++;
657 p++;
658 }
659
660 out = xmalloc(len);
661 out[0] = '\0';
662
663 strcat(out, "\"");
664
665 p = in;
666 while (1) {
667 len = strcspn(p, "\"\\");
668 strncat(out, p, len);
669 p += len;
670
671 if (p[0] == '\0')
672 break;
673
674 strcat(out, "\\");
675 strncat(out, p++, 1);
676 }
677
678 strcat(out, "\"");
679
680 return out;
681}
682
683enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
684
685static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
686 bool escape_string)
687{
688 const char *val;
689 char *escaped = NULL;
690
691 if (sym->type == S_UNKNOWN)
692 return;
693
694 val = sym_get_string_value(sym);
695
696 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
697 output_n != OUTPUT_N && *val == 'n') {
698 if (output_n == OUTPUT_N_AS_UNSET)
699 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
700 return;
701 }
702
703 if (sym->type == S_STRING && escape_string) {
704 escaped = escape_string_value(val);
705 val = escaped;
706 }
707
708 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
709
710 free(escaped);
711}
712
713static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
714{
715 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
716}
717
718static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
719{
720 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
721}
722
723void print_symbol_for_listconfig(struct symbol *sym)
724{
725 __print_symbol(stdout, sym, OUTPUT_N, true);
726}
727
728static void print_symbol_for_c(FILE *fp, struct symbol *sym)
729{
730 const char *val;
731 const char *sym_suffix = "";
732 const char *val_prefix = "";
733 char *escaped = NULL;
734
735 if (sym->type == S_UNKNOWN)
736 return;
737
738 val = sym_get_string_value(sym);
739
740 switch (sym->type) {
741 case S_BOOLEAN:
742 case S_TRISTATE:
743 switch (*val) {
744 case 'n':
745 return;
746 case 'm':
747 sym_suffix = "_MODULE";
748 /* fall through */
749 default:
750 val = "1";
751 }
752 break;
753 case S_HEX:
754 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
755 val_prefix = "0x";
756 break;
757 case S_STRING:
758 escaped = escape_string_value(val);
759 val = escaped;
760 default:
761 break;
762 }
763
764 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
765 val_prefix, val);
766
767 free(escaped);
768}
769
770static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
771{
772 const char *val;
773 const char *val_prefix = "";
774 char *val_prefixed = NULL;
775 size_t val_prefixed_len;
776 char *escaped = NULL;
777
778 if (sym->type == S_UNKNOWN)
779 return;
780
781 val = sym_get_string_value(sym);
782
783 switch (sym->type) {
784 case S_BOOLEAN:
785 case S_TRISTATE:
786 /*
787 * We do not care about disabled ones, i.e. no need for
788 * what otherwise are "comments" in other printers.
789 */
790 if (*val == 'n')
791 return;
792
793 /*
794 * To have similar functionality to the C macro `IS_ENABLED()`
795 * we provide an empty `--cfg CONFIG_X` here in both `y`
796 * and `m` cases.
797 *
798 * Then, the common `fprintf()` below will also give us
799 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
800 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
801 */
802 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
803 break;
804 case S_HEX:
805 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
806 val_prefix = "0x";
807 break;
808 default:
809 break;
810 }
811
812 if (strlen(val_prefix) > 0) {
813 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
814 val_prefixed = xmalloc(val_prefixed_len);
815 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
816 val = val_prefixed;
817 }
818
819 /* All values get escaped: the `--cfg` option only takes strings */
820 escaped = escape_string_value(val);
821 val = escaped;
822
823 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
824
825 free(escaped);
826 free(val_prefixed);
827}
828
829/*
830 * Write out a minimal config.
831 * All values that has default values are skipped as this is redundant.
832 */
833int conf_write_defconfig(const char *filename)
834{
835 struct symbol *sym;
836 struct menu *menu;
837 FILE *out;
838
839 out = fopen(filename, "w");
840 if (!out)
841 return 1;
842
843 sym_clear_all_valid();
844
845 /* Traverse all menus to find all relevant symbols */
846 menu = rootmenu.list;
847
848 while (menu != NULL)
849 {
850 sym = menu->sym;
851 if (sym == NULL) {
852 if (!menu_is_visible(menu))
853 goto next_menu;
854 } else if (!sym_is_choice(sym)) {
855 sym_calc_value(sym);
856 if (!(sym->flags & SYMBOL_WRITE))
857 goto next_menu;
858 sym->flags &= ~SYMBOL_WRITE;
859 /* If we cannot change the symbol - skip */
860 if (!sym_is_changeable(sym))
861 goto next_menu;
862 /* If symbol equals to default value - skip */
863 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
864 goto next_menu;
865
866 /*
867 * If symbol is a choice value and equals to the
868 * default for a choice - skip.
869 * But only if value is bool and equal to "y" and
870 * choice is not "optional".
871 * (If choice is "optional" then all values can be "n")
872 */
873 if (sym_is_choice_value(sym)) {
874 struct symbol *cs;
875 struct symbol *ds;
876
877 cs = prop_get_symbol(sym_get_choice_prop(sym));
878 ds = sym_choice_default(cs);
879 if (!sym_is_optional(cs) && sym == ds) {
880 if ((sym->type == S_BOOLEAN) &&
881 sym_get_tristate_value(sym) == yes)
882 goto next_menu;
883 }
884 }
885 print_symbol_for_dotconfig(out, sym);
886 }
887next_menu:
888 if (menu->list != NULL) {
889 menu = menu->list;
890 }
891 else if (menu->next != NULL) {
892 menu = menu->next;
893 } else {
894 while ((menu = menu->parent)) {
895 if (menu->next != NULL) {
896 menu = menu->next;
897 break;
898 }
899 }
900 }
901 }
902 fclose(out);
903 return 0;
904}
905
906int conf_write(const char *name)
907{
908 FILE *out;
909 struct symbol *sym;
910 struct menu *menu;
911 const char *str;
912 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
913 char *env;
914 int i;
915 bool need_newline = false;
916
917 if (!name)
918 name = conf_get_configname();
919
920 if (!*name) {
921 fprintf(stderr, "config name is empty\n");
922 return -1;
923 }
924
925 if (is_dir(name)) {
926 fprintf(stderr, "%s: Is a directory\n", name);
927 return -1;
928 }
929
930 if (make_parent_dir(name))
931 return -1;
932
933 env = getenv("KCONFIG_OVERWRITECONFIG");
934 if (env && *env) {
935 *tmpname = 0;
936 out = fopen(name, "w");
937 } else {
938 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
939 name, (int)getpid());
940 out = fopen(tmpname, "w");
941 }
942 if (!out)
943 return 1;
944
945 conf_write_heading(out, &comment_style_pound);
946
947 if (!conf_get_changed())
948 sym_clear_all_valid();
949
950 menu = rootmenu.list;
951 while (menu) {
952 sym = menu->sym;
953 if (!sym) {
954 if (!menu_is_visible(menu))
955 goto next;
956 str = menu_get_prompt(menu);
957 fprintf(out, "\n"
958 "#\n"
959 "# %s\n"
960 "#\n", str);
961 need_newline = false;
962 } else if (!(sym->flags & SYMBOL_CHOICE) &&
963 !(sym->flags & SYMBOL_WRITTEN)) {
964 sym_calc_value(sym);
965 if (!(sym->flags & SYMBOL_WRITE))
966 goto next;
967 if (need_newline) {
968 fprintf(out, "\n");
969 need_newline = false;
970 }
971 sym->flags |= SYMBOL_WRITTEN;
972 print_symbol_for_dotconfig(out, sym);
973 }
974
975next:
976 if (menu->list) {
977 menu = menu->list;
978 continue;
979 }
980
981end_check:
982 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
983 menu->prompt->type == P_MENU) {
984 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
985 need_newline = true;
986 }
987
988 if (menu->next) {
989 menu = menu->next;
990 } else {
991 menu = menu->parent;
992 if (menu)
993 goto end_check;
994 }
995 }
996 fclose(out);
997
998 for_all_symbols(i, sym)
999 sym->flags &= ~SYMBOL_WRITTEN;
1000
1001 if (*tmpname) {
1002 if (is_same(name, tmpname)) {
1003 conf_message("No change to %s", name);
1004 unlink(tmpname);
1005 conf_set_changed(false);
1006 return 0;
1007 }
1008
1009 snprintf(oldname, sizeof(oldname), "%s.old", name);
1010 rename(name, oldname);
1011 if (rename(tmpname, name))
1012 return 1;
1013 }
1014
1015 conf_message("configuration written to %s", name);
1016
1017 conf_set_changed(false);
1018
1019 return 0;
1020}
1021
1022/* write a dependency file as used by kbuild to track dependencies */
1023static int conf_write_autoconf_cmd(const char *autoconf_name)
1024{
1025 char name[PATH_MAX], tmp[PATH_MAX];
1026 struct file *file;
1027 FILE *out;
1028 int ret;
1029
1030 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
1031 if (ret >= sizeof(name)) /* check truncation */
1032 return -1;
1033
1034 if (make_parent_dir(name))
1035 return -1;
1036
1037 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
1038 if (ret >= sizeof(tmp)) /* check truncation */
1039 return -1;
1040
1041 out = fopen(tmp, "w");
1042 if (!out) {
1043 perror("fopen");
1044 return -1;
1045 }
1046
1047 fprintf(out, "deps_config := \\\n");
1048 for (file = file_list; file; file = file->next)
1049 fprintf(out, "\t%s \\\n", file->name);
1050
1051 fprintf(out, "\n%s: $(deps_config)\n\n", autoconf_name);
1052
1053 env_write_dep(out, autoconf_name);
1054
1055 fprintf(out, "\n$(deps_config): ;\n");
1056
1057 fflush(out);
1058 ret = ferror(out); /* error check for all fprintf() calls */
1059 fclose(out);
1060 if (ret)
1061 return -1;
1062
1063 if (rename(tmp, name)) {
1064 perror("rename");
1065 return -1;
1066 }
1067
1068 return 0;
1069}
1070
1071static int conf_touch_deps(void)
1072{
1073 const char *name, *tmp;
1074 struct symbol *sym;
1075 int res, i;
1076
1077 name = conf_get_autoconfig_name();
1078 tmp = strrchr(name, '/');
1079 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
1080 if (depfile_prefix_len + 1 > sizeof(depfile_path))
1081 return -1;
1082
1083 strncpy(depfile_path, name, depfile_prefix_len);
1084 depfile_path[depfile_prefix_len] = 0;
1085
1086 conf_read_simple(name, S_DEF_AUTO);
1087 sym_calc_value(modules_sym);
1088
1089 for_all_symbols(i, sym) {
1090 sym_calc_value(sym);
1091 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1092 continue;
1093 if (sym->flags & SYMBOL_WRITE) {
1094 if (sym->flags & SYMBOL_DEF_AUTO) {
1095 /*
1096 * symbol has old and new value,
1097 * so compare them...
1098 */
1099 switch (sym->type) {
1100 case S_BOOLEAN:
1101 case S_TRISTATE:
1102 if (sym_get_tristate_value(sym) ==
1103 sym->def[S_DEF_AUTO].tri)
1104 continue;
1105 break;
1106 case S_STRING:
1107 case S_HEX:
1108 case S_INT:
1109 if (!strcmp(sym_get_string_value(sym),
1110 sym->def[S_DEF_AUTO].val))
1111 continue;
1112 break;
1113 default:
1114 break;
1115 }
1116 } else {
1117 /*
1118 * If there is no old value, only 'no' (unset)
1119 * is allowed as new value.
1120 */
1121 switch (sym->type) {
1122 case S_BOOLEAN:
1123 case S_TRISTATE:
1124 if (sym_get_tristate_value(sym) == no)
1125 continue;
1126 break;
1127 default:
1128 break;
1129 }
1130 }
1131 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1132 /* There is neither an old nor a new value. */
1133 continue;
1134 /* else
1135 * There is an old value, but no new value ('no' (unset)
1136 * isn't saved in auto.conf, so the old value is always
1137 * different from 'no').
1138 */
1139
1140 res = conf_touch_dep(sym->name);
1141 if (res)
1142 return res;
1143 }
1144
1145 return 0;
1146}
1147
1148static int __conf_write_autoconf(const char *filename,
1149 void (*print_symbol)(FILE *, struct symbol *),
1150 const struct comment_style *comment_style)
1151{
1152 char tmp[PATH_MAX];
1153 FILE *file;
1154 struct symbol *sym;
1155 int ret, i;
1156
1157 if (make_parent_dir(filename))
1158 return -1;
1159
1160 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1161 if (ret >= sizeof(tmp)) /* check truncation */
1162 return -1;
1163
1164 file = fopen(tmp, "w");
1165 if (!file) {
1166 perror("fopen");
1167 return -1;
1168 }
1169
1170 conf_write_heading(file, comment_style);
1171
1172 for_all_symbols(i, sym)
1173 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1174 print_symbol(file, sym);
1175
1176 fflush(file);
1177 /* check possible errors in conf_write_heading() and print_symbol() */
1178 ret = ferror(file);
1179 fclose(file);
1180 if (ret)
1181 return -1;
1182
1183 if (rename(tmp, filename)) {
1184 perror("rename");
1185 return -1;
1186 }
1187
1188 return 0;
1189}
1190
1191int conf_write_autoconf(int overwrite)
1192{
1193 struct symbol *sym;
1194 const char *autoconf_name = conf_get_autoconfig_name();
1195 int ret, i;
1196
1197 if (!overwrite && is_present(autoconf_name))
1198 return 0;
1199
1200 ret = conf_write_autoconf_cmd(autoconf_name);
1201 if (ret)
1202 return -1;
1203
1204 if (conf_touch_deps())
1205 return 1;
1206
1207 for_all_symbols(i, sym)
1208 sym_calc_value(sym);
1209
1210 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1211 print_symbol_for_c,
1212 &comment_style_c);
1213 if (ret)
1214 return ret;
1215
1216 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1217 print_symbol_for_rustccfg,
1218 NULL);
1219 if (ret)
1220 return ret;
1221
1222 /*
1223 * Create include/config/auto.conf. This must be the last step because
1224 * Kbuild has a dependency on auto.conf and this marks the successful
1225 * completion of the previous steps.
1226 */
1227 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1228 print_symbol_for_autoconf,
1229 &comment_style_pound);
1230 if (ret)
1231 return ret;
1232
1233 return 0;
1234}
1235
1236static bool conf_changed;
1237static void (*conf_changed_callback)(void);
1238
1239void conf_set_changed(bool val)
1240{
1241 bool changed = conf_changed != val;
1242
1243 conf_changed = val;
1244
1245 if (conf_changed_callback && changed)
1246 conf_changed_callback();
1247}
1248
1249bool conf_get_changed(void)
1250{
1251 return conf_changed;
1252}
1253
1254void conf_set_changed_callback(void (*fn)(void))
1255{
1256 conf_changed_callback = fn;
1257}
1258
1259void set_all_choice_values(struct symbol *csym)
1260{
1261 struct property *prop;
1262 struct symbol *sym;
1263 struct expr *e;
1264
1265 prop = sym_get_choice_prop(csym);
1266
1267 /*
1268 * Set all non-assinged choice values to no
1269 */
1270 expr_list_for_each_sym(prop->expr, e, sym) {
1271 if (!sym_has_value(sym))
1272 sym->def[S_DEF_USER].tri = no;
1273 }
1274 csym->flags |= SYMBOL_DEF_USER;
1275 /* clear VALID to get value calculated */
1276 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1277}
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 if (def != S_DEF_AUTO)
144 conf_warning("symbol value '%s' invalid for %s",
145 p, sym->name);
146 return 1;
147 case S_OTHER:
148 if (*p != '"') {
149 for (p2 = p; *p2 && !isspace(*p2); p2++)
150 ;
151 sym->type = S_STRING;
152 goto done;
153 }
154 /* fall through */
155 case S_STRING:
156 if (*p++ != '"')
157 break;
158 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
159 if (*p2 == '"') {
160 *p2 = 0;
161 break;
162 }
163 memmove(p2, p2 + 1, strlen(p2));
164 }
165 if (!p2) {
166 if (def != S_DEF_AUTO)
167 conf_warning("invalid string found");
168 return 1;
169 }
170 /* fall through */
171 case S_INT:
172 case S_HEX:
173 done:
174 if (sym_string_valid(sym, p)) {
175 sym->def[def].val = strdup(p);
176 sym->flags |= def_flags;
177 } else {
178 if (def != S_DEF_AUTO)
179 conf_warning("symbol value '%s' invalid for %s",
180 p, sym->name);
181 return 1;
182 }
183 break;
184 default:
185 ;
186 }
187 return 0;
188}
189
190#define LINE_GROWTH 16
191static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
192{
193 char *nline;
194 size_t new_size = slen + 1;
195 if (new_size > *n) {
196 new_size += LINE_GROWTH - 1;
197 new_size *= 2;
198 nline = realloc(*lineptr, new_size);
199 if (!nline)
200 return -1;
201
202 *lineptr = nline;
203 *n = new_size;
204 }
205
206 (*lineptr)[slen] = c;
207
208 return 0;
209}
210
211static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
212{
213 char *line = *lineptr;
214 size_t slen = 0;
215
216 for (;;) {
217 int c = getc(stream);
218
219 switch (c) {
220 case '\n':
221 if (add_byte(c, &line, slen, n) < 0)
222 goto e_out;
223 slen++;
224 /* fall through */
225 case EOF:
226 if (add_byte('\0', &line, slen, n) < 0)
227 goto e_out;
228 *lineptr = line;
229 if (slen == 0)
230 return -1;
231 return slen;
232 default:
233 if (add_byte(c, &line, slen, n) < 0)
234 goto e_out;
235 slen++;
236 }
237 }
238
239e_out:
240 line[slen-1] = '\0';
241 *lineptr = line;
242 return -1;
243}
244
245int conf_read_simple(const char *name, int def)
246{
247 FILE *in = NULL;
248 char *line = NULL;
249 size_t line_asize = 0;
250 char *p, *p2;
251 struct symbol *sym;
252 int i, def_flags;
253
254 if (name) {
255 in = zconf_fopen(name);
256 } else {
257 struct property *prop;
258
259 name = conf_get_configname();
260 in = zconf_fopen(name);
261 if (in)
262 goto load;
263 sym_add_change_count(1);
264 if (!sym_defconfig_list) {
265 if (modules_sym)
266 sym_calc_value(modules_sym);
267 return 1;
268 }
269
270 for_all_defaults(sym_defconfig_list, prop) {
271 if (expr_calc_value(prop->visible.expr) == no ||
272 prop->expr->type != E_SYMBOL)
273 continue;
274 name = conf_expand_value(prop->expr->left.sym->name);
275 in = zconf_fopen(name);
276 if (in) {
277 conf_message(_("using defaults found in %s"),
278 name);
279 goto load;
280 }
281 }
282 }
283 if (!in)
284 return 1;
285
286load:
287 conf_filename = name;
288 conf_lineno = 0;
289 conf_warnings = 0;
290 conf_unsaved = 0;
291
292 def_flags = SYMBOL_DEF << def;
293 for_all_symbols(i, sym) {
294 sym->flags |= SYMBOL_CHANGED;
295 sym->flags &= ~(def_flags|SYMBOL_VALID);
296 if (sym_is_choice(sym))
297 sym->flags |= def_flags;
298 switch (sym->type) {
299 case S_INT:
300 case S_HEX:
301 case S_STRING:
302 if (sym->def[def].val)
303 free(sym->def[def].val);
304 /* fall through */
305 default:
306 sym->def[def].val = NULL;
307 sym->def[def].tri = no;
308 }
309 }
310
311 while (compat_getline(&line, &line_asize, in) != -1) {
312 conf_lineno++;
313 sym = NULL;
314 if (line[0] == '#') {
315 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
316 continue;
317 p = strchr(line + 2 + strlen(CONFIG_), ' ');
318 if (!p)
319 continue;
320 *p++ = 0;
321 if (strncmp(p, "is not set", 10))
322 continue;
323 if (def == S_DEF_USER) {
324 sym = sym_find(line + 2 + strlen(CONFIG_));
325 if (!sym) {
326 sym_add_change_count(1);
327 goto setsym;
328 }
329 } else {
330 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
331 if (sym->type == S_UNKNOWN)
332 sym->type = S_BOOLEAN;
333 }
334 if (sym->flags & def_flags) {
335 conf_warning("override: reassigning to symbol %s", sym->name);
336 }
337 switch (sym->type) {
338 case S_BOOLEAN:
339 case S_TRISTATE:
340 sym->def[def].tri = no;
341 sym->flags |= def_flags;
342 break;
343 default:
344 ;
345 }
346 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
347 p = strchr(line + strlen(CONFIG_), '=');
348 if (!p)
349 continue;
350 *p++ = 0;
351 p2 = strchr(p, '\n');
352 if (p2) {
353 *p2-- = 0;
354 if (*p2 == '\r')
355 *p2 = 0;
356 }
357 if (def == S_DEF_USER) {
358 sym = sym_find(line + strlen(CONFIG_));
359 if (!sym) {
360 sym_add_change_count(1);
361 goto setsym;
362 }
363 } else {
364 sym = sym_lookup(line + strlen(CONFIG_), 0);
365 if (sym->type == S_UNKNOWN)
366 sym->type = S_OTHER;
367 }
368 if (sym->flags & def_flags) {
369 conf_warning("override: reassigning to symbol %s", sym->name);
370 }
371 if (conf_set_sym_val(sym, def, def_flags, p))
372 continue;
373 } else {
374 if (line[0] != '\r' && line[0] != '\n')
375 conf_warning("unexpected data");
376 continue;
377 }
378setsym:
379 if (sym && sym_is_choice_value(sym)) {
380 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
381 switch (sym->def[def].tri) {
382 case no:
383 break;
384 case mod:
385 if (cs->def[def].tri == yes) {
386 conf_warning("%s creates inconsistent choice state", sym->name);
387 cs->flags &= ~def_flags;
388 }
389 break;
390 case yes:
391 if (cs->def[def].tri != no)
392 conf_warning("override: %s changes choice state", sym->name);
393 cs->def[def].val = sym;
394 break;
395 }
396 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
397 }
398 }
399 free(line);
400 fclose(in);
401
402 if (modules_sym)
403 sym_calc_value(modules_sym);
404 return 0;
405}
406
407int conf_read(const char *name)
408{
409 struct symbol *sym;
410 int i;
411
412 sym_set_change_count(0);
413
414 if (conf_read_simple(name, S_DEF_USER))
415 return 1;
416
417 for_all_symbols(i, sym) {
418 sym_calc_value(sym);
419 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
420 continue;
421 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
422 /* check that calculated value agrees with saved value */
423 switch (sym->type) {
424 case S_BOOLEAN:
425 case S_TRISTATE:
426 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
427 break;
428 if (!sym_is_choice(sym))
429 continue;
430 /* fall through */
431 default:
432 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
433 continue;
434 break;
435 }
436 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
437 /* no previous value and not saved */
438 continue;
439 conf_unsaved++;
440 /* maybe print value in verbose mode... */
441 }
442
443 for_all_symbols(i, sym) {
444 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
445 /* Reset values of generates values, so they'll appear
446 * as new, if they should become visible, but that
447 * doesn't quite work if the Kconfig and the saved
448 * configuration disagree.
449 */
450 if (sym->visible == no && !conf_unsaved)
451 sym->flags &= ~SYMBOL_DEF_USER;
452 switch (sym->type) {
453 case S_STRING:
454 case S_INT:
455 case S_HEX:
456 /* Reset a string value if it's out of range */
457 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
458 break;
459 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
460 conf_unsaved++;
461 break;
462 default:
463 break;
464 }
465 }
466 }
467
468 sym_add_change_count(conf_warnings || conf_unsaved);
469
470 return 0;
471}
472
473/*
474 * Kconfig configuration printer
475 *
476 * This printer is used when generating the resulting configuration after
477 * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
478 * passing a non-NULL argument to the printer.
479 *
480 */
481static void
482kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
483{
484
485 switch (sym->type) {
486 case S_BOOLEAN:
487 case S_TRISTATE:
488 if (*value == 'n') {
489 bool skip_unset = (arg != NULL);
490
491 if (!skip_unset)
492 fprintf(fp, "# %s%s is not set\n",
493 CONFIG_, sym->name);
494 return;
495 }
496 break;
497 default:
498 break;
499 }
500
501 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
502}
503
504static void
505kconfig_print_comment(FILE *fp, const char *value, void *arg)
506{
507 const char *p = value;
508 size_t l;
509
510 for (;;) {
511 l = strcspn(p, "\n");
512 fprintf(fp, "#");
513 if (l) {
514 fprintf(fp, " ");
515 xfwrite(p, l, 1, fp);
516 p += l;
517 }
518 fprintf(fp, "\n");
519 if (*p++ == '\0')
520 break;
521 }
522}
523
524static struct conf_printer kconfig_printer_cb =
525{
526 .print_symbol = kconfig_print_symbol,
527 .print_comment = kconfig_print_comment,
528};
529
530/*
531 * Header printer
532 *
533 * This printer is used when generating the `include/generated/autoconf.h' file.
534 */
535static void
536header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
537{
538
539 switch (sym->type) {
540 case S_BOOLEAN:
541 case S_TRISTATE: {
542 const char *suffix = "";
543
544 switch (*value) {
545 case 'n':
546 break;
547 case 'm':
548 suffix = "_MODULE";
549 /* fall through */
550 default:
551 fprintf(fp, "#define %s%s%s 1\n",
552 CONFIG_, sym->name, suffix);
553 }
554 break;
555 }
556 case S_HEX: {
557 const char *prefix = "";
558
559 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
560 prefix = "0x";
561 fprintf(fp, "#define %s%s %s%s\n",
562 CONFIG_, sym->name, prefix, value);
563 break;
564 }
565 case S_STRING:
566 case S_INT:
567 fprintf(fp, "#define %s%s %s\n",
568 CONFIG_, sym->name, value);
569 break;
570 default:
571 break;
572 }
573
574}
575
576static void
577header_print_comment(FILE *fp, const char *value, void *arg)
578{
579 const char *p = value;
580 size_t l;
581
582 fprintf(fp, "/*\n");
583 for (;;) {
584 l = strcspn(p, "\n");
585 fprintf(fp, " *");
586 if (l) {
587 fprintf(fp, " ");
588 xfwrite(p, l, 1, fp);
589 p += l;
590 }
591 fprintf(fp, "\n");
592 if (*p++ == '\0')
593 break;
594 }
595 fprintf(fp, " */\n");
596}
597
598static struct conf_printer header_printer_cb =
599{
600 .print_symbol = header_print_symbol,
601 .print_comment = header_print_comment,
602};
603
604/*
605 * Tristate printer
606 *
607 * This printer is used when generating the `include/config/tristate.conf' file.
608 */
609static void
610tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
611{
612
613 if (sym->type == S_TRISTATE && *value != 'n')
614 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
615}
616
617static struct conf_printer tristate_printer_cb =
618{
619 .print_symbol = tristate_print_symbol,
620 .print_comment = kconfig_print_comment,
621};
622
623static void conf_write_symbol(FILE *fp, struct symbol *sym,
624 struct conf_printer *printer, void *printer_arg)
625{
626 const char *str;
627
628 switch (sym->type) {
629 case S_OTHER:
630 case S_UNKNOWN:
631 break;
632 case S_STRING:
633 str = sym_get_string_value(sym);
634 str = sym_escape_string_value(str);
635 printer->print_symbol(fp, sym, str, printer_arg);
636 free((void *)str);
637 break;
638 default:
639 str = sym_get_string_value(sym);
640 printer->print_symbol(fp, sym, str, printer_arg);
641 }
642}
643
644static void
645conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
646{
647 char buf[256];
648
649 snprintf(buf, sizeof(buf),
650 "\n"
651 "Automatically generated file; DO NOT EDIT.\n"
652 "%s\n",
653 rootmenu.prompt->text);
654
655 printer->print_comment(fp, buf, printer_arg);
656}
657
658/*
659 * Write out a minimal config.
660 * All values that has default values are skipped as this is redundant.
661 */
662int conf_write_defconfig(const char *filename)
663{
664 struct symbol *sym;
665 struct menu *menu;
666 FILE *out;
667
668 out = fopen(filename, "w");
669 if (!out)
670 return 1;
671
672 sym_clear_all_valid();
673
674 /* Traverse all menus to find all relevant symbols */
675 menu = rootmenu.list;
676
677 while (menu != NULL)
678 {
679 sym = menu->sym;
680 if (sym == NULL) {
681 if (!menu_is_visible(menu))
682 goto next_menu;
683 } else if (!sym_is_choice(sym)) {
684 sym_calc_value(sym);
685 if (!(sym->flags & SYMBOL_WRITE))
686 goto next_menu;
687 sym->flags &= ~SYMBOL_WRITE;
688 /* If we cannot change the symbol - skip */
689 if (!sym_is_changable(sym))
690 goto next_menu;
691 /* If symbol equals to default value - skip */
692 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
693 goto next_menu;
694
695 /*
696 * If symbol is a choice value and equals to the
697 * default for a choice - skip.
698 * But only if value is bool and equal to "y" and
699 * choice is not "optional".
700 * (If choice is "optional" then all values can be "n")
701 */
702 if (sym_is_choice_value(sym)) {
703 struct symbol *cs;
704 struct symbol *ds;
705
706 cs = prop_get_symbol(sym_get_choice_prop(sym));
707 ds = sym_choice_default(cs);
708 if (!sym_is_optional(cs) && sym == ds) {
709 if ((sym->type == S_BOOLEAN) &&
710 sym_get_tristate_value(sym) == yes)
711 goto next_menu;
712 }
713 }
714 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
715 }
716next_menu:
717 if (menu->list != NULL) {
718 menu = menu->list;
719 }
720 else if (menu->next != NULL) {
721 menu = menu->next;
722 } else {
723 while ((menu = menu->parent)) {
724 if (menu->next != NULL) {
725 menu = menu->next;
726 break;
727 }
728 }
729 }
730 }
731 fclose(out);
732 return 0;
733}
734
735int conf_write(const char *name)
736{
737 FILE *out;
738 struct symbol *sym;
739 struct menu *menu;
740 const char *basename;
741 const char *str;
742 char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
743 char *env;
744
745 dirname[0] = 0;
746 if (name && name[0]) {
747 struct stat st;
748 char *slash;
749
750 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
751 strcpy(dirname, name);
752 strcat(dirname, "/");
753 basename = conf_get_configname();
754 } else if ((slash = strrchr(name, '/'))) {
755 int size = slash - name + 1;
756 memcpy(dirname, name, size);
757 dirname[size] = 0;
758 if (slash[1])
759 basename = slash + 1;
760 else
761 basename = conf_get_configname();
762 } else
763 basename = name;
764 } else
765 basename = conf_get_configname();
766
767 sprintf(newname, "%s%s", dirname, basename);
768 env = getenv("KCONFIG_OVERWRITECONFIG");
769 if (!env || !*env) {
770 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
771 out = fopen(tmpname, "w");
772 } else {
773 *tmpname = 0;
774 out = fopen(newname, "w");
775 }
776 if (!out)
777 return 1;
778
779 conf_write_heading(out, &kconfig_printer_cb, NULL);
780
781 if (!conf_get_changed())
782 sym_clear_all_valid();
783
784 menu = rootmenu.list;
785 while (menu) {
786 sym = menu->sym;
787 if (!sym) {
788 if (!menu_is_visible(menu))
789 goto next;
790 str = menu_get_prompt(menu);
791 fprintf(out, "\n"
792 "#\n"
793 "# %s\n"
794 "#\n", str);
795 } else if (!(sym->flags & SYMBOL_CHOICE)) {
796 sym_calc_value(sym);
797 if (!(sym->flags & SYMBOL_WRITE))
798 goto next;
799 sym->flags &= ~SYMBOL_WRITE;
800
801 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
802 }
803
804next:
805 if (menu->list) {
806 menu = menu->list;
807 continue;
808 }
809 if (menu->next)
810 menu = menu->next;
811 else while ((menu = menu->parent)) {
812 if (menu->next) {
813 menu = menu->next;
814 break;
815 }
816 }
817 }
818 fclose(out);
819
820 if (*tmpname) {
821 strcat(dirname, basename);
822 strcat(dirname, ".old");
823 rename(newname, dirname);
824 if (rename(tmpname, newname))
825 return 1;
826 }
827
828 conf_message(_("configuration written to %s"), newname);
829
830 sym_set_change_count(0);
831
832 return 0;
833}
834
835static int conf_split_config(void)
836{
837 const char *name;
838 char path[PATH_MAX+1];
839 char *s, *d, c;
840 struct symbol *sym;
841 struct stat sb;
842 int res, i, fd;
843
844 name = conf_get_autoconfig_name();
845 conf_read_simple(name, S_DEF_AUTO);
846
847 if (chdir("include/config"))
848 return 1;
849
850 res = 0;
851 for_all_symbols(i, sym) {
852 sym_calc_value(sym);
853 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
854 continue;
855 if (sym->flags & SYMBOL_WRITE) {
856 if (sym->flags & SYMBOL_DEF_AUTO) {
857 /*
858 * symbol has old and new value,
859 * so compare them...
860 */
861 switch (sym->type) {
862 case S_BOOLEAN:
863 case S_TRISTATE:
864 if (sym_get_tristate_value(sym) ==
865 sym->def[S_DEF_AUTO].tri)
866 continue;
867 break;
868 case S_STRING:
869 case S_HEX:
870 case S_INT:
871 if (!strcmp(sym_get_string_value(sym),
872 sym->def[S_DEF_AUTO].val))
873 continue;
874 break;
875 default:
876 break;
877 }
878 } else {
879 /*
880 * If there is no old value, only 'no' (unset)
881 * is allowed as new value.
882 */
883 switch (sym->type) {
884 case S_BOOLEAN:
885 case S_TRISTATE:
886 if (sym_get_tristate_value(sym) == no)
887 continue;
888 break;
889 default:
890 break;
891 }
892 }
893 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
894 /* There is neither an old nor a new value. */
895 continue;
896 /* else
897 * There is an old value, but no new value ('no' (unset)
898 * isn't saved in auto.conf, so the old value is always
899 * different from 'no').
900 */
901
902 /* Replace all '_' and append ".h" */
903 s = sym->name;
904 d = path;
905 while ((c = *s++)) {
906 c = tolower(c);
907 *d++ = (c == '_') ? '/' : c;
908 }
909 strcpy(d, ".h");
910
911 /* Assume directory path already exists. */
912 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
913 if (fd == -1) {
914 if (errno != ENOENT) {
915 res = 1;
916 break;
917 }
918 /*
919 * Create directory components,
920 * unless they exist already.
921 */
922 d = path;
923 while ((d = strchr(d, '/'))) {
924 *d = 0;
925 if (stat(path, &sb) && mkdir(path, 0755)) {
926 res = 1;
927 goto out;
928 }
929 *d++ = '/';
930 }
931 /* Try it again. */
932 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
933 if (fd == -1) {
934 res = 1;
935 break;
936 }
937 }
938 close(fd);
939 }
940out:
941 if (chdir("../.."))
942 return 1;
943
944 return res;
945}
946
947int conf_write_autoconf(void)
948{
949 struct symbol *sym;
950 const char *name;
951 FILE *out, *tristate, *out_h;
952 int i;
953
954 sym_clear_all_valid();
955
956 file_write_dep("include/config/auto.conf.cmd");
957
958 if (conf_split_config())
959 return 1;
960
961 out = fopen(".tmpconfig", "w");
962 if (!out)
963 return 1;
964
965 tristate = fopen(".tmpconfig_tristate", "w");
966 if (!tristate) {
967 fclose(out);
968 return 1;
969 }
970
971 out_h = fopen(".tmpconfig.h", "w");
972 if (!out_h) {
973 fclose(out);
974 fclose(tristate);
975 return 1;
976 }
977
978 conf_write_heading(out, &kconfig_printer_cb, NULL);
979
980 conf_write_heading(tristate, &tristate_printer_cb, NULL);
981
982 conf_write_heading(out_h, &header_printer_cb, NULL);
983
984 for_all_symbols(i, sym) {
985 sym_calc_value(sym);
986 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
987 continue;
988
989 /* write symbol to auto.conf, tristate and header files */
990 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
991
992 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
993
994 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
995 }
996 fclose(out);
997 fclose(tristate);
998 fclose(out_h);
999
1000 name = getenv("KCONFIG_AUTOHEADER");
1001 if (!name)
1002 name = "include/generated/autoconf.h";
1003 if (rename(".tmpconfig.h", name))
1004 return 1;
1005 name = getenv("KCONFIG_TRISTATE");
1006 if (!name)
1007 name = "include/config/tristate.conf";
1008 if (rename(".tmpconfig_tristate", name))
1009 return 1;
1010 name = conf_get_autoconfig_name();
1011 /*
1012 * This must be the last step, kbuild has a dependency on auto.conf
1013 * and this marks the successful completion of the previous steps.
1014 */
1015 if (rename(".tmpconfig", name))
1016 return 1;
1017
1018 return 0;
1019}
1020
1021static int sym_change_count;
1022static void (*conf_changed_callback)(void);
1023
1024void sym_set_change_count(int count)
1025{
1026 int _sym_change_count = sym_change_count;
1027 sym_change_count = count;
1028 if (conf_changed_callback &&
1029 (bool)_sym_change_count != (bool)count)
1030 conf_changed_callback();
1031}
1032
1033void sym_add_change_count(int count)
1034{
1035 sym_set_change_count(count + sym_change_count);
1036}
1037
1038bool conf_get_changed(void)
1039{
1040 return sym_change_count;
1041}
1042
1043void conf_set_changed_callback(void (*fn)(void))
1044{
1045 conf_changed_callback = fn;
1046}
1047
1048static bool randomize_choice_values(struct symbol *csym)
1049{
1050 struct property *prop;
1051 struct symbol *sym;
1052 struct expr *e;
1053 int cnt, def;
1054
1055 /*
1056 * If choice is mod then we may have more items selected
1057 * and if no then no-one.
1058 * In both cases stop.
1059 */
1060 if (csym->curr.tri != yes)
1061 return false;
1062
1063 prop = sym_get_choice_prop(csym);
1064
1065 /* count entries in choice block */
1066 cnt = 0;
1067 expr_list_for_each_sym(prop->expr, e, sym)
1068 cnt++;
1069
1070 /*
1071 * find a random value and set it to yes,
1072 * set the rest to no so we have only one set
1073 */
1074 def = (rand() % cnt);
1075
1076 cnt = 0;
1077 expr_list_for_each_sym(prop->expr, e, sym) {
1078 if (def == cnt++) {
1079 sym->def[S_DEF_USER].tri = yes;
1080 csym->def[S_DEF_USER].val = sym;
1081 }
1082 else {
1083 sym->def[S_DEF_USER].tri = no;
1084 }
1085 sym->flags |= SYMBOL_DEF_USER;
1086 /* clear VALID to get value calculated */
1087 sym->flags &= ~SYMBOL_VALID;
1088 }
1089 csym->flags |= SYMBOL_DEF_USER;
1090 /* clear VALID to get value calculated */
1091 csym->flags &= ~(SYMBOL_VALID);
1092
1093 return true;
1094}
1095
1096void set_all_choice_values(struct symbol *csym)
1097{
1098 struct property *prop;
1099 struct symbol *sym;
1100 struct expr *e;
1101
1102 prop = sym_get_choice_prop(csym);
1103
1104 /*
1105 * Set all non-assinged choice values to no
1106 */
1107 expr_list_for_each_sym(prop->expr, e, sym) {
1108 if (!sym_has_value(sym))
1109 sym->def[S_DEF_USER].tri = no;
1110 }
1111 csym->flags |= SYMBOL_DEF_USER;
1112 /* clear VALID to get value calculated */
1113 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1114}
1115
1116bool conf_set_all_new_symbols(enum conf_def_mode mode)
1117{
1118 struct symbol *sym, *csym;
1119 int i, cnt, pby, pty, ptm; /* pby: probability of boolean = y
1120 * pty: probability of tristate = y
1121 * ptm: probability of tristate = m
1122 */
1123
1124 pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1125 * below, otherwise gcc whines about
1126 * -Wmaybe-uninitialized */
1127 if (mode == def_random) {
1128 int n, p[3];
1129 char *env = getenv("KCONFIG_PROBABILITY");
1130 n = 0;
1131 while( env && *env ) {
1132 char *endp;
1133 int tmp = strtol( env, &endp, 10 );
1134 if( tmp >= 0 && tmp <= 100 ) {
1135 p[n++] = tmp;
1136 } else {
1137 errno = ERANGE;
1138 perror( "KCONFIG_PROBABILITY" );
1139 exit( 1 );
1140 }
1141 env = (*endp == ':') ? endp+1 : endp;
1142 if( n >=3 ) {
1143 break;
1144 }
1145 }
1146 switch( n ) {
1147 case 1:
1148 pby = p[0]; ptm = pby/2; pty = pby-ptm;
1149 break;
1150 case 2:
1151 pty = p[0]; ptm = p[1]; pby = pty + ptm;
1152 break;
1153 case 3:
1154 pby = p[0]; pty = p[1]; ptm = p[2];
1155 break;
1156 }
1157
1158 if( pty+ptm > 100 ) {
1159 errno = ERANGE;
1160 perror( "KCONFIG_PROBABILITY" );
1161 exit( 1 );
1162 }
1163 }
1164 bool has_changed = false;
1165
1166 for_all_symbols(i, sym) {
1167 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1168 continue;
1169 switch (sym_get_type(sym)) {
1170 case S_BOOLEAN:
1171 case S_TRISTATE:
1172 has_changed = true;
1173 switch (mode) {
1174 case def_yes:
1175 sym->def[S_DEF_USER].tri = yes;
1176 break;
1177 case def_mod:
1178 sym->def[S_DEF_USER].tri = mod;
1179 break;
1180 case def_no:
1181 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1182 sym->def[S_DEF_USER].tri = yes;
1183 else
1184 sym->def[S_DEF_USER].tri = no;
1185 break;
1186 case def_random:
1187 sym->def[S_DEF_USER].tri = no;
1188 cnt = rand() % 100;
1189 if (sym->type == S_TRISTATE) {
1190 if (cnt < pty)
1191 sym->def[S_DEF_USER].tri = yes;
1192 else if (cnt < (pty+ptm))
1193 sym->def[S_DEF_USER].tri = mod;
1194 } else if (cnt < pby)
1195 sym->def[S_DEF_USER].tri = yes;
1196 break;
1197 default:
1198 continue;
1199 }
1200 if (!(sym_is_choice(sym) && mode == def_random))
1201 sym->flags |= SYMBOL_DEF_USER;
1202 break;
1203 default:
1204 break;
1205 }
1206
1207 }
1208
1209 sym_clear_all_valid();
1210
1211 /*
1212 * We have different type of choice blocks.
1213 * If curr.tri equals to mod then we can select several
1214 * choice symbols in one block.
1215 * In this case we do nothing.
1216 * If curr.tri equals yes then only one symbol can be
1217 * selected in a choice block and we set it to yes,
1218 * and the rest to no.
1219 */
1220 if (mode != def_random) {
1221 for_all_symbols(i, csym) {
1222 if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1223 sym_is_choice_value(csym))
1224 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1225 }
1226 }
1227
1228 for_all_symbols(i, csym) {
1229 if (sym_has_value(csym) || !sym_is_choice(csym))
1230 continue;
1231
1232 sym_calc_value(csym);
1233 if (mode == def_random)
1234 has_changed = randomize_choice_values(csym);
1235 else {
1236 set_all_choice_values(csym);
1237 has_changed = true;
1238 }
1239 }
1240
1241 return has_changed;
1242}