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