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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
158static 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
169static void conf_default_message_callback(const char *s)
170{
171 printf("#\n# ");
172 printf("%s", s);
173 printf("\n#\n");
174}
175
176static void (*conf_message_callback)(const char *s) =
177 conf_default_message_callback;
178void conf_set_message_callback(void (*fn)(const char *s))
179{
180 conf_message_callback = fn;
181}
182
183static 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
198const char *conf_get_configname(void)
199{
200 char *name = getenv("KCONFIG_CONFIG");
201
202 return name ? name : ".config";
203}
204
205static 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
212static 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
219static const char *conf_get_rustccfg_name(void)
220{
221 char *name = getenv("KCONFIG_RUSTCCFG");
222
223 return name ? name : "include/generated/rustc_cfg";
224}
225
226static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
227{
228 char *p2;
229
230 switch (sym->type) {
231 case S_TRISTATE:
232 if (p[0] == 'm') {
233 sym->def[def].tri = mod;
234 sym->flags |= def_flags;
235 break;
236 }
237 /* fall through */
238 case S_BOOLEAN:
239 if (p[0] == 'y') {
240 sym->def[def].tri = yes;
241 sym->flags |= def_flags;
242 break;
243 }
244 if (p[0] == 'n') {
245 sym->def[def].tri = no;
246 sym->flags |= def_flags;
247 break;
248 }
249 if (def != S_DEF_AUTO)
250 conf_warning("symbol value '%s' invalid for %s",
251 p, sym->name);
252 return 1;
253 case S_STRING:
254 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
255 if (def != S_DEF_AUTO) {
256 if (*p++ != '"')
257 break;
258 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
259 if (*p2 == '"') {
260 *p2 = 0;
261 break;
262 }
263 memmove(p2, p2 + 1, strlen(p2));
264 }
265 if (!p2) {
266 conf_warning("invalid string found");
267 return 1;
268 }
269 }
270 /* fall through */
271 case S_INT:
272 case S_HEX:
273 if (sym_string_valid(sym, p)) {
274 sym->def[def].val = xstrdup(p);
275 sym->flags |= def_flags;
276 } else {
277 if (def != S_DEF_AUTO)
278 conf_warning("symbol value '%s' invalid for %s",
279 p, sym->name);
280 return 1;
281 }
282 break;
283 default:
284 ;
285 }
286 return 0;
287}
288
289#define LINE_GROWTH 16
290static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
291{
292 char *nline;
293 size_t new_size = slen + 1;
294 if (new_size > *n) {
295 new_size += LINE_GROWTH - 1;
296 new_size *= 2;
297 nline = xrealloc(*lineptr, new_size);
298 if (!nline)
299 return -1;
300
301 *lineptr = nline;
302 *n = new_size;
303 }
304
305 (*lineptr)[slen] = c;
306
307 return 0;
308}
309
310static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
311{
312 char *line = *lineptr;
313 size_t slen = 0;
314
315 for (;;) {
316 int c = getc(stream);
317
318 switch (c) {
319 case '\n':
320 if (add_byte(c, &line, slen, n) < 0)
321 goto e_out;
322 slen++;
323 /* fall through */
324 case EOF:
325 if (add_byte('\0', &line, slen, n) < 0)
326 goto e_out;
327 *lineptr = line;
328 if (slen == 0)
329 return -1;
330 return slen;
331 default:
332 if (add_byte(c, &line, slen, n) < 0)
333 goto e_out;
334 slen++;
335 }
336 }
337
338e_out:
339 line[slen-1] = '\0';
340 *lineptr = line;
341 return -1;
342}
343
344int conf_read_simple(const char *name, int def)
345{
346 FILE *in = NULL;
347 char *line = NULL;
348 size_t line_asize = 0;
349 char *p, *p2;
350 struct symbol *sym;
351 int i, def_flags;
352
353 if (name) {
354 in = zconf_fopen(name);
355 } else {
356 char *env;
357
358 name = conf_get_configname();
359 in = zconf_fopen(name);
360 if (in)
361 goto load;
362 conf_set_changed(true);
363
364 env = getenv("KCONFIG_DEFCONFIG_LIST");
365 if (!env)
366 return 1;
367
368 while (1) {
369 bool is_last;
370
371 while (isspace(*env))
372 env++;
373
374 if (!*env)
375 break;
376
377 p = env;
378 while (*p && !isspace(*p))
379 p++;
380
381 is_last = (*p == '\0');
382
383 *p = '\0';
384
385 in = zconf_fopen(env);
386 if (in) {
387 conf_message("using defaults found in %s",
388 env);
389 goto load;
390 }
391
392 if (is_last)
393 break;
394
395 env = p + 1;
396 }
397 }
398 if (!in)
399 return 1;
400
401load:
402 conf_filename = name;
403 conf_lineno = 0;
404 conf_warnings = 0;
405
406 def_flags = SYMBOL_DEF << def;
407 for_all_symbols(i, sym) {
408 sym->flags |= SYMBOL_CHANGED;
409 sym->flags &= ~(def_flags|SYMBOL_VALID);
410 if (sym_is_choice(sym))
411 sym->flags |= def_flags;
412 switch (sym->type) {
413 case S_INT:
414 case S_HEX:
415 case S_STRING:
416 if (sym->def[def].val)
417 free(sym->def[def].val);
418 /* fall through */
419 default:
420 sym->def[def].val = NULL;
421 sym->def[def].tri = no;
422 }
423 }
424
425 while (compat_getline(&line, &line_asize, in) != -1) {
426 conf_lineno++;
427 sym = NULL;
428 if (line[0] == '#') {
429 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
430 continue;
431 p = strchr(line + 2 + strlen(CONFIG_), ' ');
432 if (!p)
433 continue;
434 *p++ = 0;
435 if (strncmp(p, "is not set", 10))
436 continue;
437 if (def == S_DEF_USER) {
438 sym = sym_find(line + 2 + strlen(CONFIG_));
439 if (!sym) {
440 conf_set_changed(true);
441 continue;
442 }
443 } else {
444 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
445 if (sym->type == S_UNKNOWN)
446 sym->type = S_BOOLEAN;
447 }
448 if (sym->flags & def_flags) {
449 conf_warning("override: reassigning to symbol %s", sym->name);
450 }
451 switch (sym->type) {
452 case S_BOOLEAN:
453 case S_TRISTATE:
454 sym->def[def].tri = no;
455 sym->flags |= def_flags;
456 break;
457 default:
458 ;
459 }
460 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
461 p = strchr(line + strlen(CONFIG_), '=');
462 if (!p)
463 continue;
464 *p++ = 0;
465 p2 = strchr(p, '\n');
466 if (p2) {
467 *p2-- = 0;
468 if (*p2 == '\r')
469 *p2 = 0;
470 }
471
472 sym = sym_find(line + strlen(CONFIG_));
473 if (!sym) {
474 if (def == S_DEF_AUTO)
475 /*
476 * Reading from include/config/auto.conf
477 * If CONFIG_FOO previously existed in
478 * auto.conf but it is missing now,
479 * include/config/FOO must be touched.
480 */
481 conf_touch_dep(line + strlen(CONFIG_));
482 else
483 conf_set_changed(true);
484 continue;
485 }
486
487 if (sym->flags & def_flags) {
488 conf_warning("override: reassigning to symbol %s", sym->name);
489 }
490 if (conf_set_sym_val(sym, def, def_flags, p))
491 continue;
492 } else {
493 if (line[0] != '\r' && line[0] != '\n')
494 conf_warning("unexpected data: %.*s",
495 (int)strcspn(line, "\r\n"), line);
496
497 continue;
498 }
499
500 if (sym && sym_is_choice_value(sym)) {
501 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
502 switch (sym->def[def].tri) {
503 case no:
504 break;
505 case mod:
506 if (cs->def[def].tri == yes) {
507 conf_warning("%s creates inconsistent choice state", sym->name);
508 cs->flags &= ~def_flags;
509 }
510 break;
511 case yes:
512 if (cs->def[def].tri != no)
513 conf_warning("override: %s changes choice state", sym->name);
514 cs->def[def].val = sym;
515 break;
516 }
517 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
518 }
519 }
520 free(line);
521 fclose(in);
522 return 0;
523}
524
525int conf_read(const char *name)
526{
527 struct symbol *sym;
528 int conf_unsaved = 0;
529 int i;
530
531 conf_set_changed(false);
532
533 if (conf_read_simple(name, S_DEF_USER)) {
534 sym_calc_value(modules_sym);
535 return 1;
536 }
537
538 sym_calc_value(modules_sym);
539
540 for_all_symbols(i, sym) {
541 sym_calc_value(sym);
542 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
543 continue;
544 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
545 /* check that calculated value agrees with saved value */
546 switch (sym->type) {
547 case S_BOOLEAN:
548 case S_TRISTATE:
549 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
550 continue;
551 break;
552 default:
553 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
554 continue;
555 break;
556 }
557 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
558 /* no previous value and not saved */
559 continue;
560 conf_unsaved++;
561 /* maybe print value in verbose mode... */
562 }
563
564 for_all_symbols(i, sym) {
565 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
566 /* Reset values of generates values, so they'll appear
567 * as new, if they should become visible, but that
568 * doesn't quite work if the Kconfig and the saved
569 * configuration disagree.
570 */
571 if (sym->visible == no && !conf_unsaved)
572 sym->flags &= ~SYMBOL_DEF_USER;
573 switch (sym->type) {
574 case S_STRING:
575 case S_INT:
576 case S_HEX:
577 /* Reset a string value if it's out of range */
578 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
579 break;
580 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
581 conf_unsaved++;
582 break;
583 default:
584 break;
585 }
586 }
587 }
588
589 if (conf_warnings || conf_unsaved)
590 conf_set_changed(true);
591
592 return 0;
593}
594
595struct comment_style {
596 const char *decoration;
597 const char *prefix;
598 const char *postfix;
599};
600
601static const struct comment_style comment_style_pound = {
602 .decoration = "#",
603 .prefix = "#",
604 .postfix = "#",
605};
606
607static const struct comment_style comment_style_c = {
608 .decoration = " *",
609 .prefix = "/*",
610 .postfix = " */",
611};
612
613static void conf_write_heading(FILE *fp, const struct comment_style *cs)
614{
615 if (!cs)
616 return;
617
618 fprintf(fp, "%s\n", cs->prefix);
619
620 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
621 cs->decoration);
622
623 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
624
625 fprintf(fp, "%s\n", cs->postfix);
626}
627
628/* The returned pointer must be freed on the caller side */
629static char *escape_string_value(const char *in)
630{
631 const char *p;
632 char *out;
633 size_t len;
634
635 len = strlen(in) + strlen("\"\"") + 1;
636
637 p = in;
638 while (1) {
639 p += strcspn(p, "\"\\");
640
641 if (p[0] == '\0')
642 break;
643
644 len++;
645 p++;
646 }
647
648 out = xmalloc(len);
649 out[0] = '\0';
650
651 strcat(out, "\"");
652
653 p = in;
654 while (1) {
655 len = strcspn(p, "\"\\");
656 strncat(out, p, len);
657 p += len;
658
659 if (p[0] == '\0')
660 break;
661
662 strcat(out, "\\");
663 strncat(out, p++, 1);
664 }
665
666 strcat(out, "\"");
667
668 return out;
669}
670
671enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
672
673static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
674 bool escape_string)
675{
676 const char *val;
677 char *escaped = NULL;
678
679 if (sym->type == S_UNKNOWN)
680 return;
681
682 val = sym_get_string_value(sym);
683
684 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
685 output_n != OUTPUT_N && *val == 'n') {
686 if (output_n == OUTPUT_N_AS_UNSET)
687 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
688 return;
689 }
690
691 if (sym->type == S_STRING && escape_string) {
692 escaped = escape_string_value(val);
693 val = escaped;
694 }
695
696 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
697
698 free(escaped);
699}
700
701static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
702{
703 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
704}
705
706static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
707{
708 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
709}
710
711void print_symbol_for_listconfig(struct symbol *sym)
712{
713 __print_symbol(stdout, sym, OUTPUT_N, true);
714}
715
716static void print_symbol_for_c(FILE *fp, struct symbol *sym)
717{
718 const char *val;
719 const char *sym_suffix = "";
720 const char *val_prefix = "";
721 char *escaped = NULL;
722
723 if (sym->type == S_UNKNOWN)
724 return;
725
726 val = sym_get_string_value(sym);
727
728 switch (sym->type) {
729 case S_BOOLEAN:
730 case S_TRISTATE:
731 switch (*val) {
732 case 'n':
733 return;
734 case 'm':
735 sym_suffix = "_MODULE";
736 /* fall through */
737 default:
738 val = "1";
739 }
740 break;
741 case S_HEX:
742 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
743 val_prefix = "0x";
744 break;
745 case S_STRING:
746 escaped = escape_string_value(val);
747 val = escaped;
748 default:
749 break;
750 }
751
752 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
753 val_prefix, val);
754
755 free(escaped);
756}
757
758static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
759{
760 const char *val;
761 const char *val_prefix = "";
762 char *val_prefixed = NULL;
763 size_t val_prefixed_len;
764 char *escaped = NULL;
765
766 if (sym->type == S_UNKNOWN)
767 return;
768
769 val = sym_get_string_value(sym);
770
771 switch (sym->type) {
772 case S_BOOLEAN:
773 case S_TRISTATE:
774 /*
775 * We do not care about disabled ones, i.e. no need for
776 * what otherwise are "comments" in other printers.
777 */
778 if (*val == 'n')
779 return;
780
781 /*
782 * To have similar functionality to the C macro `IS_ENABLED()`
783 * we provide an empty `--cfg CONFIG_X` here in both `y`
784 * and `m` cases.
785 *
786 * Then, the common `fprintf()` below will also give us
787 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
788 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
789 */
790 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
791 break;
792 case S_HEX:
793 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
794 val_prefix = "0x";
795 break;
796 default:
797 break;
798 }
799
800 if (strlen(val_prefix) > 0) {
801 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
802 val_prefixed = xmalloc(val_prefixed_len);
803 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
804 val = val_prefixed;
805 }
806
807 /* All values get escaped: the `--cfg` option only takes strings */
808 escaped = escape_string_value(val);
809 val = escaped;
810
811 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
812
813 free(escaped);
814 free(val_prefixed);
815}
816
817/*
818 * Write out a minimal config.
819 * All values that has default values are skipped as this is redundant.
820 */
821int conf_write_defconfig(const char *filename)
822{
823 struct symbol *sym;
824 struct menu *menu;
825 FILE *out;
826
827 out = fopen(filename, "w");
828 if (!out)
829 return 1;
830
831 sym_clear_all_valid();
832
833 /* Traverse all menus to find all relevant symbols */
834 menu = rootmenu.list;
835
836 while (menu != NULL)
837 {
838 sym = menu->sym;
839 if (sym == NULL) {
840 if (!menu_is_visible(menu))
841 goto next_menu;
842 } else if (!sym_is_choice(sym)) {
843 sym_calc_value(sym);
844 if (!(sym->flags & SYMBOL_WRITE))
845 goto next_menu;
846 sym->flags &= ~SYMBOL_WRITE;
847 /* If we cannot change the symbol - skip */
848 if (!sym_is_changeable(sym))
849 goto next_menu;
850 /* If symbol equals to default value - skip */
851 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
852 goto next_menu;
853
854 /*
855 * If symbol is a choice value and equals to the
856 * default for a choice - skip.
857 * But only if value is bool and equal to "y" and
858 * choice is not "optional".
859 * (If choice is "optional" then all values can be "n")
860 */
861 if (sym_is_choice_value(sym)) {
862 struct symbol *cs;
863 struct symbol *ds;
864
865 cs = prop_get_symbol(sym_get_choice_prop(sym));
866 ds = sym_choice_default(cs);
867 if (!sym_is_optional(cs) && sym == ds) {
868 if ((sym->type == S_BOOLEAN) &&
869 sym_get_tristate_value(sym) == yes)
870 goto next_menu;
871 }
872 }
873 print_symbol_for_dotconfig(out, sym);
874 }
875next_menu:
876 if (menu->list != NULL) {
877 menu = menu->list;
878 }
879 else if (menu->next != NULL) {
880 menu = menu->next;
881 } else {
882 while ((menu = menu->parent)) {
883 if (menu->next != NULL) {
884 menu = menu->next;
885 break;
886 }
887 }
888 }
889 }
890 fclose(out);
891 return 0;
892}
893
894int conf_write(const char *name)
895{
896 FILE *out;
897 struct symbol *sym;
898 struct menu *menu;
899 const char *str;
900 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
901 char *env;
902 int i;
903 bool need_newline = false;
904
905 if (!name)
906 name = conf_get_configname();
907
908 if (!*name) {
909 fprintf(stderr, "config name is empty\n");
910 return -1;
911 }
912
913 if (is_dir(name)) {
914 fprintf(stderr, "%s: Is a directory\n", name);
915 return -1;
916 }
917
918 if (make_parent_dir(name))
919 return -1;
920
921 env = getenv("KCONFIG_OVERWRITECONFIG");
922 if (env && *env) {
923 *tmpname = 0;
924 out = fopen(name, "w");
925 } else {
926 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
927 name, (int)getpid());
928 out = fopen(tmpname, "w");
929 }
930 if (!out)
931 return 1;
932
933 conf_write_heading(out, &comment_style_pound);
934
935 if (!conf_get_changed())
936 sym_clear_all_valid();
937
938 menu = rootmenu.list;
939 while (menu) {
940 sym = menu->sym;
941 if (!sym) {
942 if (!menu_is_visible(menu))
943 goto next;
944 str = menu_get_prompt(menu);
945 fprintf(out, "\n"
946 "#\n"
947 "# %s\n"
948 "#\n", str);
949 need_newline = false;
950 } else if (!(sym->flags & SYMBOL_CHOICE) &&
951 !(sym->flags & SYMBOL_WRITTEN)) {
952 sym_calc_value(sym);
953 if (!(sym->flags & SYMBOL_WRITE))
954 goto next;
955 if (need_newline) {
956 fprintf(out, "\n");
957 need_newline = false;
958 }
959 sym->flags |= SYMBOL_WRITTEN;
960 print_symbol_for_dotconfig(out, sym);
961 }
962
963next:
964 if (menu->list) {
965 menu = menu->list;
966 continue;
967 }
968
969end_check:
970 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
971 menu->prompt->type == P_MENU) {
972 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
973 need_newline = true;
974 }
975
976 if (menu->next) {
977 menu = menu->next;
978 } else {
979 menu = menu->parent;
980 if (menu)
981 goto end_check;
982 }
983 }
984 fclose(out);
985
986 for_all_symbols(i, sym)
987 sym->flags &= ~SYMBOL_WRITTEN;
988
989 if (*tmpname) {
990 if (is_same(name, tmpname)) {
991 conf_message("No change to %s", name);
992 unlink(tmpname);
993 conf_set_changed(false);
994 return 0;
995 }
996
997 snprintf(oldname, sizeof(oldname), "%s.old", name);
998 rename(name, oldname);
999 if (rename(tmpname, name))
1000 return 1;
1001 }
1002
1003 conf_message("configuration written to %s", name);
1004
1005 conf_set_changed(false);
1006
1007 return 0;
1008}
1009
1010/* write a dependency file as used by kbuild to track dependencies */
1011static int conf_write_autoconf_cmd(const char *autoconf_name)
1012{
1013 char name[PATH_MAX], tmp[PATH_MAX];
1014 struct file *file;
1015 FILE *out;
1016 int ret;
1017
1018 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
1019 if (ret >= sizeof(name)) /* check truncation */
1020 return -1;
1021
1022 if (make_parent_dir(name))
1023 return -1;
1024
1025 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
1026 if (ret >= sizeof(tmp)) /* check truncation */
1027 return -1;
1028
1029 out = fopen(tmp, "w");
1030 if (!out) {
1031 perror("fopen");
1032 return -1;
1033 }
1034
1035 fprintf(out, "deps_config := \\\n");
1036 for (file = file_list; file; file = file->next)
1037 fprintf(out, "\t%s \\\n", file->name);
1038
1039 fprintf(out, "\n%s: $(deps_config)\n\n", autoconf_name);
1040
1041 env_write_dep(out, autoconf_name);
1042
1043 fprintf(out, "\n$(deps_config): ;\n");
1044
1045 fflush(out);
1046 ret = ferror(out); /* error check for all fprintf() calls */
1047 fclose(out);
1048 if (ret)
1049 return -1;
1050
1051 if (rename(tmp, name)) {
1052 perror("rename");
1053 return -1;
1054 }
1055
1056 return 0;
1057}
1058
1059static int conf_touch_deps(void)
1060{
1061 const char *name, *tmp;
1062 struct symbol *sym;
1063 int res, i;
1064
1065 name = conf_get_autoconfig_name();
1066 tmp = strrchr(name, '/');
1067 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
1068 if (depfile_prefix_len + 1 > sizeof(depfile_path))
1069 return -1;
1070
1071 strncpy(depfile_path, name, depfile_prefix_len);
1072 depfile_path[depfile_prefix_len] = 0;
1073
1074 conf_read_simple(name, S_DEF_AUTO);
1075 sym_calc_value(modules_sym);
1076
1077 for_all_symbols(i, sym) {
1078 sym_calc_value(sym);
1079 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1080 continue;
1081 if (sym->flags & SYMBOL_WRITE) {
1082 if (sym->flags & SYMBOL_DEF_AUTO) {
1083 /*
1084 * symbol has old and new value,
1085 * so compare them...
1086 */
1087 switch (sym->type) {
1088 case S_BOOLEAN:
1089 case S_TRISTATE:
1090 if (sym_get_tristate_value(sym) ==
1091 sym->def[S_DEF_AUTO].tri)
1092 continue;
1093 break;
1094 case S_STRING:
1095 case S_HEX:
1096 case S_INT:
1097 if (!strcmp(sym_get_string_value(sym),
1098 sym->def[S_DEF_AUTO].val))
1099 continue;
1100 break;
1101 default:
1102 break;
1103 }
1104 } else {
1105 /*
1106 * If there is no old value, only 'no' (unset)
1107 * is allowed as new value.
1108 */
1109 switch (sym->type) {
1110 case S_BOOLEAN:
1111 case S_TRISTATE:
1112 if (sym_get_tristate_value(sym) == no)
1113 continue;
1114 break;
1115 default:
1116 break;
1117 }
1118 }
1119 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1120 /* There is neither an old nor a new value. */
1121 continue;
1122 /* else
1123 * There is an old value, but no new value ('no' (unset)
1124 * isn't saved in auto.conf, so the old value is always
1125 * different from 'no').
1126 */
1127
1128 res = conf_touch_dep(sym->name);
1129 if (res)
1130 return res;
1131 }
1132
1133 return 0;
1134}
1135
1136static int __conf_write_autoconf(const char *filename,
1137 void (*print_symbol)(FILE *, struct symbol *),
1138 const struct comment_style *comment_style)
1139{
1140 char tmp[PATH_MAX];
1141 FILE *file;
1142 struct symbol *sym;
1143 int ret, i;
1144
1145 if (make_parent_dir(filename))
1146 return -1;
1147
1148 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1149 if (ret >= sizeof(tmp)) /* check truncation */
1150 return -1;
1151
1152 file = fopen(tmp, "w");
1153 if (!file) {
1154 perror("fopen");
1155 return -1;
1156 }
1157
1158 conf_write_heading(file, comment_style);
1159
1160 for_all_symbols(i, sym)
1161 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1162 print_symbol(file, sym);
1163
1164 fflush(file);
1165 /* check possible errors in conf_write_heading() and print_symbol() */
1166 ret = ferror(file);
1167 fclose(file);
1168 if (ret)
1169 return -1;
1170
1171 if (rename(tmp, filename)) {
1172 perror("rename");
1173 return -1;
1174 }
1175
1176 return 0;
1177}
1178
1179int conf_write_autoconf(int overwrite)
1180{
1181 struct symbol *sym;
1182 const char *autoconf_name = conf_get_autoconfig_name();
1183 int ret, i;
1184
1185 if (!overwrite && is_present(autoconf_name))
1186 return 0;
1187
1188 ret = conf_write_autoconf_cmd(autoconf_name);
1189 if (ret)
1190 return -1;
1191
1192 if (conf_touch_deps())
1193 return 1;
1194
1195 for_all_symbols(i, sym)
1196 sym_calc_value(sym);
1197
1198 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1199 print_symbol_for_c,
1200 &comment_style_c);
1201 if (ret)
1202 return ret;
1203
1204 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1205 print_symbol_for_rustccfg,
1206 NULL);
1207 if (ret)
1208 return ret;
1209
1210 /*
1211 * Create include/config/auto.conf. This must be the last step because
1212 * Kbuild has a dependency on auto.conf and this marks the successful
1213 * completion of the previous steps.
1214 */
1215 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1216 print_symbol_for_autoconf,
1217 &comment_style_pound);
1218 if (ret)
1219 return ret;
1220
1221 return 0;
1222}
1223
1224static bool conf_changed;
1225static void (*conf_changed_callback)(void);
1226
1227void conf_set_changed(bool val)
1228{
1229 if (conf_changed_callback && conf_changed != val)
1230 conf_changed_callback();
1231
1232 conf_changed = val;
1233}
1234
1235bool conf_get_changed(void)
1236{
1237 return conf_changed;
1238}
1239
1240void conf_set_changed_callback(void (*fn)(void))
1241{
1242 conf_changed_callback = fn;
1243}
1244
1245void set_all_choice_values(struct symbol *csym)
1246{
1247 struct property *prop;
1248 struct symbol *sym;
1249 struct expr *e;
1250
1251 prop = sym_get_choice_prop(csym);
1252
1253 /*
1254 * Set all non-assinged choice values to no
1255 */
1256 expr_list_for_each_sym(prop->expr, e, sym) {
1257 if (!sym_has_value(sym))
1258 sym->def[S_DEF_USER].tri = no;
1259 }
1260 csym->flags |= SYMBOL_DEF_USER;
1261 /* clear VALID to get value calculated */
1262 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1263}
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}