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