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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 <ctype.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <limits.h>
12#include <stdarg.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <time.h>
17#include <unistd.h>
18
19#include "lkc.h"
20
21/* return true if 'path' exists, false otherwise */
22static bool is_present(const char *path)
23{
24 struct stat st;
25
26 return !stat(path, &st);
27}
28
29/* return true if 'path' exists and it is a directory, false otherwise */
30static bool is_dir(const char *path)
31{
32 struct stat st;
33
34 if (stat(path, &st))
35 return 0;
36
37 return S_ISDIR(st.st_mode);
38}
39
40/* return true if the given two files are the same, false otherwise */
41static bool is_same(const char *file1, const char *file2)
42{
43 int fd1, fd2;
44 struct stat st1, st2;
45 void *map1, *map2;
46 bool ret = false;
47
48 fd1 = open(file1, O_RDONLY);
49 if (fd1 < 0)
50 return ret;
51
52 fd2 = open(file2, O_RDONLY);
53 if (fd2 < 0)
54 goto close1;
55
56 ret = fstat(fd1, &st1);
57 if (ret)
58 goto close2;
59 ret = fstat(fd2, &st2);
60 if (ret)
61 goto close2;
62
63 if (st1.st_size != st2.st_size)
64 goto close2;
65
66 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
67 if (map1 == MAP_FAILED)
68 goto close2;
69
70 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
71 if (map2 == MAP_FAILED)
72 goto close2;
73
74 if (bcmp(map1, map2, st1.st_size))
75 goto close2;
76
77 ret = true;
78close2:
79 close(fd2);
80close1:
81 close(fd1);
82
83 return ret;
84}
85
86/*
87 * Create the parent directory of the given path.
88 *
89 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
90 */
91static int make_parent_dir(const char *path)
92{
93 char tmp[PATH_MAX + 1];
94 char *p;
95
96 strncpy(tmp, path, sizeof(tmp));
97 tmp[sizeof(tmp) - 1] = 0;
98
99 /* Remove the base name. Just return if nothing is left */
100 p = strrchr(tmp, '/');
101 if (!p)
102 return 0;
103 *(p + 1) = 0;
104
105 /* Just in case it is an absolute path */
106 p = tmp;
107 while (*p == '/')
108 p++;
109
110 while ((p = strchr(p, '/'))) {
111 *p = 0;
112
113 /* skip if the directory exists */
114 if (!is_dir(tmp) && mkdir(tmp, 0755))
115 return -1;
116
117 *p = '/';
118 while (*p == '/')
119 p++;
120 }
121
122 return 0;
123}
124
125static char depfile_path[PATH_MAX];
126static size_t depfile_prefix_len;
127
128/* touch depfile for symbol 'name' */
129static int conf_touch_dep(const char *name)
130{
131 int fd, ret;
132 const char *s;
133 char *d, c;
134
135 /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
136 if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
137 return -1;
138
139 d = depfile_path + depfile_prefix_len;
140 s = name;
141
142 while ((c = *s++))
143 *d++ = (c == '_') ? '/' : tolower(c);
144 strcpy(d, ".h");
145
146 /* Assume directory path already exists. */
147 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
148 if (fd == -1) {
149 if (errno != ENOENT)
150 return -1;
151
152 ret = make_parent_dir(depfile_path);
153 if (ret)
154 return ret;
155
156 /* Try it again. */
157 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
158 if (fd == -1)
159 return -1;
160 }
161 close(fd);
162
163 return 0;
164}
165
166struct conf_printer {
167 void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
168 void (*print_comment)(FILE *, const char *, void *);
169};
170
171static void conf_warning(const char *fmt, ...)
172 __attribute__ ((format (printf, 1, 2)));
173
174static void conf_message(const char *fmt, ...)
175 __attribute__ ((format (printf, 1, 2)));
176
177static const char *conf_filename;
178static int conf_lineno, conf_warnings;
179
180static void conf_warning(const char *fmt, ...)
181{
182 va_list ap;
183 va_start(ap, fmt);
184 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
185 vfprintf(stderr, fmt, ap);
186 fprintf(stderr, "\n");
187 va_end(ap);
188 conf_warnings++;
189}
190
191static void conf_default_message_callback(const char *s)
192{
193 printf("#\n# ");
194 printf("%s", s);
195 printf("\n#\n");
196}
197
198static void (*conf_message_callback)(const char *s) =
199 conf_default_message_callback;
200void conf_set_message_callback(void (*fn)(const char *s))
201{
202 conf_message_callback = fn;
203}
204
205static void conf_message(const char *fmt, ...)
206{
207 va_list ap;
208 char buf[4096];
209
210 if (!conf_message_callback)
211 return;
212
213 va_start(ap, fmt);
214
215 vsnprintf(buf, sizeof(buf), fmt, ap);
216 conf_message_callback(buf);
217 va_end(ap);
218}
219
220const char *conf_get_configname(void)
221{
222 char *name = getenv("KCONFIG_CONFIG");
223
224 return name ? name : ".config";
225}
226
227static const char *conf_get_autoconfig_name(void)
228{
229 char *name = getenv("KCONFIG_AUTOCONFIG");
230
231 return name ? name : "include/config/auto.conf";
232}
233
234static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
235{
236 char *p2;
237
238 switch (sym->type) {
239 case S_TRISTATE:
240 if (p[0] == 'm') {
241 sym->def[def].tri = mod;
242 sym->flags |= def_flags;
243 break;
244 }
245 /* fall through */
246 case S_BOOLEAN:
247 if (p[0] == 'y') {
248 sym->def[def].tri = yes;
249 sym->flags |= def_flags;
250 break;
251 }
252 if (p[0] == 'n') {
253 sym->def[def].tri = no;
254 sym->flags |= def_flags;
255 break;
256 }
257 if (def != S_DEF_AUTO)
258 conf_warning("symbol value '%s' invalid for %s",
259 p, sym->name);
260 return 1;
261 case S_STRING:
262 if (*p++ != '"')
263 break;
264 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
265 if (*p2 == '"') {
266 *p2 = 0;
267 break;
268 }
269 memmove(p2, p2 + 1, strlen(p2));
270 }
271 if (!p2) {
272 if (def != S_DEF_AUTO)
273 conf_warning("invalid string found");
274 return 1;
275 }
276 /* fall through */
277 case S_INT:
278 case S_HEX:
279 if (sym_string_valid(sym, p)) {
280 sym->def[def].val = xstrdup(p);
281 sym->flags |= def_flags;
282 } else {
283 if (def != S_DEF_AUTO)
284 conf_warning("symbol value '%s' invalid for %s",
285 p, sym->name);
286 return 1;
287 }
288 break;
289 default:
290 ;
291 }
292 return 0;
293}
294
295#define LINE_GROWTH 16
296static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
297{
298 char *nline;
299 size_t new_size = slen + 1;
300 if (new_size > *n) {
301 new_size += LINE_GROWTH - 1;
302 new_size *= 2;
303 nline = xrealloc(*lineptr, new_size);
304 if (!nline)
305 return -1;
306
307 *lineptr = nline;
308 *n = new_size;
309 }
310
311 (*lineptr)[slen] = c;
312
313 return 0;
314}
315
316static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
317{
318 char *line = *lineptr;
319 size_t slen = 0;
320
321 for (;;) {
322 int c = getc(stream);
323
324 switch (c) {
325 case '\n':
326 if (add_byte(c, &line, slen, n) < 0)
327 goto e_out;
328 slen++;
329 /* fall through */
330 case EOF:
331 if (add_byte('\0', &line, slen, n) < 0)
332 goto e_out;
333 *lineptr = line;
334 if (slen == 0)
335 return -1;
336 return slen;
337 default:
338 if (add_byte(c, &line, slen, n) < 0)
339 goto e_out;
340 slen++;
341 }
342 }
343
344e_out:
345 line[slen-1] = '\0';
346 *lineptr = line;
347 return -1;
348}
349
350int conf_read_simple(const char *name, int def)
351{
352 FILE *in = NULL;
353 char *line = NULL;
354 size_t line_asize = 0;
355 char *p, *p2;
356 struct symbol *sym;
357 int i, def_flags;
358
359 if (name) {
360 in = zconf_fopen(name);
361 } else {
362 struct property *prop;
363
364 name = conf_get_configname();
365 in = zconf_fopen(name);
366 if (in)
367 goto load;
368 sym_add_change_count(1);
369 if (!sym_defconfig_list)
370 return 1;
371
372 for_all_defaults(sym_defconfig_list, prop) {
373 if (expr_calc_value(prop->visible.expr) == no ||
374 prop->expr->type != E_SYMBOL)
375 continue;
376 sym_calc_value(prop->expr->left.sym);
377 name = sym_get_string_value(prop->expr->left.sym);
378 in = zconf_fopen(name);
379 if (in) {
380 conf_message("using defaults found in %s",
381 name);
382 goto load;
383 }
384 }
385 }
386 if (!in)
387 return 1;
388
389load:
390 conf_filename = name;
391 conf_lineno = 0;
392 conf_warnings = 0;
393
394 def_flags = SYMBOL_DEF << def;
395 for_all_symbols(i, sym) {
396 sym->flags |= SYMBOL_CHANGED;
397 sym->flags &= ~(def_flags|SYMBOL_VALID);
398 if (sym_is_choice(sym))
399 sym->flags |= def_flags;
400 switch (sym->type) {
401 case S_INT:
402 case S_HEX:
403 case S_STRING:
404 if (sym->def[def].val)
405 free(sym->def[def].val);
406 /* fall through */
407 default:
408 sym->def[def].val = NULL;
409 sym->def[def].tri = no;
410 }
411 }
412
413 while (compat_getline(&line, &line_asize, in) != -1) {
414 conf_lineno++;
415 sym = NULL;
416 if (line[0] == '#') {
417 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
418 continue;
419 p = strchr(line + 2 + strlen(CONFIG_), ' ');
420 if (!p)
421 continue;
422 *p++ = 0;
423 if (strncmp(p, "is not set", 10))
424 continue;
425 if (def == S_DEF_USER) {
426 sym = sym_find(line + 2 + strlen(CONFIG_));
427 if (!sym) {
428 sym_add_change_count(1);
429 continue;
430 }
431 } else {
432 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
433 if (sym->type == S_UNKNOWN)
434 sym->type = S_BOOLEAN;
435 }
436 if (sym->flags & def_flags) {
437 conf_warning("override: reassigning to symbol %s", sym->name);
438 }
439 switch (sym->type) {
440 case S_BOOLEAN:
441 case S_TRISTATE:
442 sym->def[def].tri = no;
443 sym->flags |= def_flags;
444 break;
445 default:
446 ;
447 }
448 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
449 p = strchr(line + strlen(CONFIG_), '=');
450 if (!p)
451 continue;
452 *p++ = 0;
453 p2 = strchr(p, '\n');
454 if (p2) {
455 *p2-- = 0;
456 if (*p2 == '\r')
457 *p2 = 0;
458 }
459
460 sym = sym_find(line + strlen(CONFIG_));
461 if (!sym) {
462 if (def == S_DEF_AUTO)
463 /*
464 * Reading from include/config/auto.conf
465 * If CONFIG_FOO previously existed in
466 * auto.conf but it is missing now,
467 * include/config/foo.h must be touched.
468 */
469 conf_touch_dep(line + strlen(CONFIG_));
470 else
471 sym_add_change_count(1);
472 continue;
473 }
474
475 if (sym->flags & def_flags) {
476 conf_warning("override: reassigning to symbol %s", sym->name);
477 }
478 if (conf_set_sym_val(sym, def, def_flags, p))
479 continue;
480 } else {
481 if (line[0] != '\r' && line[0] != '\n')
482 conf_warning("unexpected data: %.*s",
483 (int)strcspn(line, "\r\n"), line);
484
485 continue;
486 }
487
488 if (sym && sym_is_choice_value(sym)) {
489 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
490 switch (sym->def[def].tri) {
491 case no:
492 break;
493 case mod:
494 if (cs->def[def].tri == yes) {
495 conf_warning("%s creates inconsistent choice state", sym->name);
496 cs->flags &= ~def_flags;
497 }
498 break;
499 case yes:
500 if (cs->def[def].tri != no)
501 conf_warning("override: %s changes choice state", sym->name);
502 cs->def[def].val = sym;
503 break;
504 }
505 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
506 }
507 }
508 free(line);
509 fclose(in);
510 return 0;
511}
512
513int conf_read(const char *name)
514{
515 struct symbol *sym;
516 int conf_unsaved = 0;
517 int i;
518
519 sym_set_change_count(0);
520
521 if (conf_read_simple(name, S_DEF_USER)) {
522 sym_calc_value(modules_sym);
523 return 1;
524 }
525
526 sym_calc_value(modules_sym);
527
528 for_all_symbols(i, sym) {
529 sym_calc_value(sym);
530 if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
531 continue;
532 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
533 /* check that calculated value agrees with saved value */
534 switch (sym->type) {
535 case S_BOOLEAN:
536 case S_TRISTATE:
537 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
538 continue;
539 break;
540 default:
541 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
542 continue;
543 break;
544 }
545 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
546 /* no previous value and not saved */
547 continue;
548 conf_unsaved++;
549 /* maybe print value in verbose mode... */
550 }
551
552 for_all_symbols(i, sym) {
553 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
554 /* Reset values of generates values, so they'll appear
555 * as new, if they should become visible, but that
556 * doesn't quite work if the Kconfig and the saved
557 * configuration disagree.
558 */
559 if (sym->visible == no && !conf_unsaved)
560 sym->flags &= ~SYMBOL_DEF_USER;
561 switch (sym->type) {
562 case S_STRING:
563 case S_INT:
564 case S_HEX:
565 /* Reset a string value if it's out of range */
566 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
567 break;
568 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
569 conf_unsaved++;
570 break;
571 default:
572 break;
573 }
574 }
575 }
576
577 sym_add_change_count(conf_warnings || conf_unsaved);
578
579 return 0;
580}
581
582/*
583 * Kconfig configuration printer
584 *
585 * This printer is used when generating the resulting configuration after
586 * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
587 * passing a non-NULL argument to the printer.
588 *
589 */
590static void
591kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
592{
593
594 switch (sym->type) {
595 case S_BOOLEAN:
596 case S_TRISTATE:
597 if (*value == 'n') {
598 bool skip_unset = (arg != NULL);
599
600 if (!skip_unset)
601 fprintf(fp, "# %s%s is not set\n",
602 CONFIG_, sym->name);
603 return;
604 }
605 break;
606 default:
607 break;
608 }
609
610 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
611}
612
613static void
614kconfig_print_comment(FILE *fp, const char *value, void *arg)
615{
616 const char *p = value;
617 size_t l;
618
619 for (;;) {
620 l = strcspn(p, "\n");
621 fprintf(fp, "#");
622 if (l) {
623 fprintf(fp, " ");
624 xfwrite(p, l, 1, fp);
625 p += l;
626 }
627 fprintf(fp, "\n");
628 if (*p++ == '\0')
629 break;
630 }
631}
632
633static struct conf_printer kconfig_printer_cb =
634{
635 .print_symbol = kconfig_print_symbol,
636 .print_comment = kconfig_print_comment,
637};
638
639/*
640 * Header printer
641 *
642 * This printer is used when generating the `include/generated/autoconf.h' file.
643 */
644static void
645header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
646{
647
648 switch (sym->type) {
649 case S_BOOLEAN:
650 case S_TRISTATE: {
651 const char *suffix = "";
652
653 switch (*value) {
654 case 'n':
655 break;
656 case 'm':
657 suffix = "_MODULE";
658 /* fall through */
659 default:
660 fprintf(fp, "#define %s%s%s 1\n",
661 CONFIG_, sym->name, suffix);
662 }
663 break;
664 }
665 case S_HEX: {
666 const char *prefix = "";
667
668 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
669 prefix = "0x";
670 fprintf(fp, "#define %s%s %s%s\n",
671 CONFIG_, sym->name, prefix, value);
672 break;
673 }
674 case S_STRING:
675 case S_INT:
676 fprintf(fp, "#define %s%s %s\n",
677 CONFIG_, sym->name, value);
678 break;
679 default:
680 break;
681 }
682
683}
684
685static void
686header_print_comment(FILE *fp, const char *value, void *arg)
687{
688 const char *p = value;
689 size_t l;
690
691 fprintf(fp, "/*\n");
692 for (;;) {
693 l = strcspn(p, "\n");
694 fprintf(fp, " *");
695 if (l) {
696 fprintf(fp, " ");
697 xfwrite(p, l, 1, fp);
698 p += l;
699 }
700 fprintf(fp, "\n");
701 if (*p++ == '\0')
702 break;
703 }
704 fprintf(fp, " */\n");
705}
706
707static struct conf_printer header_printer_cb =
708{
709 .print_symbol = header_print_symbol,
710 .print_comment = header_print_comment,
711};
712
713static void conf_write_symbol(FILE *fp, struct symbol *sym,
714 struct conf_printer *printer, void *printer_arg)
715{
716 const char *str;
717
718 switch (sym->type) {
719 case S_UNKNOWN:
720 break;
721 case S_STRING:
722 str = sym_get_string_value(sym);
723 str = sym_escape_string_value(str);
724 printer->print_symbol(fp, sym, str, printer_arg);
725 free((void *)str);
726 break;
727 default:
728 str = sym_get_string_value(sym);
729 printer->print_symbol(fp, sym, str, printer_arg);
730 }
731}
732
733static void
734conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
735{
736 char buf[256];
737
738 snprintf(buf, sizeof(buf),
739 "\n"
740 "Automatically generated file; DO NOT EDIT.\n"
741 "%s\n",
742 rootmenu.prompt->text);
743
744 printer->print_comment(fp, buf, printer_arg);
745}
746
747/*
748 * Write out a minimal config.
749 * All values that has default values are skipped as this is redundant.
750 */
751int conf_write_defconfig(const char *filename)
752{
753 struct symbol *sym;
754 struct menu *menu;
755 FILE *out;
756
757 out = fopen(filename, "w");
758 if (!out)
759 return 1;
760
761 sym_clear_all_valid();
762
763 /* Traverse all menus to find all relevant symbols */
764 menu = rootmenu.list;
765
766 while (menu != NULL)
767 {
768 sym = menu->sym;
769 if (sym == NULL) {
770 if (!menu_is_visible(menu))
771 goto next_menu;
772 } else if (!sym_is_choice(sym)) {
773 sym_calc_value(sym);
774 if (!(sym->flags & SYMBOL_WRITE))
775 goto next_menu;
776 sym->flags &= ~SYMBOL_WRITE;
777 /* If we cannot change the symbol - skip */
778 if (!sym_is_changeable(sym))
779 goto next_menu;
780 /* If symbol equals to default value - skip */
781 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
782 goto next_menu;
783
784 /*
785 * If symbol is a choice value and equals to the
786 * default for a choice - skip.
787 * But only if value is bool and equal to "y" and
788 * choice is not "optional".
789 * (If choice is "optional" then all values can be "n")
790 */
791 if (sym_is_choice_value(sym)) {
792 struct symbol *cs;
793 struct symbol *ds;
794
795 cs = prop_get_symbol(sym_get_choice_prop(sym));
796 ds = sym_choice_default(cs);
797 if (!sym_is_optional(cs) && sym == ds) {
798 if ((sym->type == S_BOOLEAN) &&
799 sym_get_tristate_value(sym) == yes)
800 goto next_menu;
801 }
802 }
803 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
804 }
805next_menu:
806 if (menu->list != NULL) {
807 menu = menu->list;
808 }
809 else if (menu->next != NULL) {
810 menu = menu->next;
811 } else {
812 while ((menu = menu->parent)) {
813 if (menu->next != NULL) {
814 menu = menu->next;
815 break;
816 }
817 }
818 }
819 }
820 fclose(out);
821 return 0;
822}
823
824int conf_write(const char *name)
825{
826 FILE *out;
827 struct symbol *sym;
828 struct menu *menu;
829 const char *str;
830 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
831 char *env;
832 int i;
833 bool need_newline = false;
834
835 if (!name)
836 name = conf_get_configname();
837
838 if (!*name) {
839 fprintf(stderr, "config name is empty\n");
840 return -1;
841 }
842
843 if (is_dir(name)) {
844 fprintf(stderr, "%s: Is a directory\n", name);
845 return -1;
846 }
847
848 if (make_parent_dir(name))
849 return -1;
850
851 env = getenv("KCONFIG_OVERWRITECONFIG");
852 if (env && *env) {
853 *tmpname = 0;
854 out = fopen(name, "w");
855 } else {
856 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
857 name, (int)getpid());
858 out = fopen(tmpname, "w");
859 }
860 if (!out)
861 return 1;
862
863 conf_write_heading(out, &kconfig_printer_cb, NULL);
864
865 if (!conf_get_changed())
866 sym_clear_all_valid();
867
868 menu = rootmenu.list;
869 while (menu) {
870 sym = menu->sym;
871 if (!sym) {
872 if (!menu_is_visible(menu))
873 goto next;
874 str = menu_get_prompt(menu);
875 fprintf(out, "\n"
876 "#\n"
877 "# %s\n"
878 "#\n", str);
879 need_newline = false;
880 } else if (!(sym->flags & SYMBOL_CHOICE) &&
881 !(sym->flags & SYMBOL_WRITTEN)) {
882 sym_calc_value(sym);
883 if (!(sym->flags & SYMBOL_WRITE))
884 goto next;
885 if (need_newline) {
886 fprintf(out, "\n");
887 need_newline = false;
888 }
889 sym->flags |= SYMBOL_WRITTEN;
890 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
891 }
892
893next:
894 if (menu->list) {
895 menu = menu->list;
896 continue;
897 }
898 if (menu->next)
899 menu = menu->next;
900 else while ((menu = menu->parent)) {
901 if (!menu->sym && menu_is_visible(menu) &&
902 menu != &rootmenu) {
903 str = menu_get_prompt(menu);
904 fprintf(out, "# end of %s\n", str);
905 need_newline = true;
906 }
907 if (menu->next) {
908 menu = menu->next;
909 break;
910 }
911 }
912 }
913 fclose(out);
914
915 for_all_symbols(i, sym)
916 sym->flags &= ~SYMBOL_WRITTEN;
917
918 if (*tmpname) {
919 if (is_same(name, tmpname)) {
920 conf_message("No change to %s", name);
921 unlink(tmpname);
922 sym_set_change_count(0);
923 return 0;
924 }
925
926 snprintf(oldname, sizeof(oldname), "%s.old", name);
927 rename(name, oldname);
928 if (rename(tmpname, name))
929 return 1;
930 }
931
932 conf_message("configuration written to %s", name);
933
934 sym_set_change_count(0);
935
936 return 0;
937}
938
939/* write a dependency file as used by kbuild to track dependencies */
940static int conf_write_dep(const char *name)
941{
942 struct file *file;
943 FILE *out;
944
945 out = fopen("..config.tmp", "w");
946 if (!out)
947 return 1;
948 fprintf(out, "deps_config := \\\n");
949 for (file = file_list; file; file = file->next) {
950 if (file->next)
951 fprintf(out, "\t%s \\\n", file->name);
952 else
953 fprintf(out, "\t%s\n", file->name);
954 }
955 fprintf(out, "\n%s: \\\n"
956 "\t$(deps_config)\n\n", conf_get_autoconfig_name());
957
958 env_write_dep(out, conf_get_autoconfig_name());
959
960 fprintf(out, "\n$(deps_config): ;\n");
961 fclose(out);
962
963 if (make_parent_dir(name))
964 return 1;
965 rename("..config.tmp", name);
966 return 0;
967}
968
969static int conf_touch_deps(void)
970{
971 const char *name;
972 struct symbol *sym;
973 int res, i;
974
975 strcpy(depfile_path, "include/config/");
976 depfile_prefix_len = strlen(depfile_path);
977
978 name = conf_get_autoconfig_name();
979 conf_read_simple(name, S_DEF_AUTO);
980 sym_calc_value(modules_sym);
981
982 for_all_symbols(i, sym) {
983 sym_calc_value(sym);
984 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
985 continue;
986 if (sym->flags & SYMBOL_WRITE) {
987 if (sym->flags & SYMBOL_DEF_AUTO) {
988 /*
989 * symbol has old and new value,
990 * so compare them...
991 */
992 switch (sym->type) {
993 case S_BOOLEAN:
994 case S_TRISTATE:
995 if (sym_get_tristate_value(sym) ==
996 sym->def[S_DEF_AUTO].tri)
997 continue;
998 break;
999 case S_STRING:
1000 case S_HEX:
1001 case S_INT:
1002 if (!strcmp(sym_get_string_value(sym),
1003 sym->def[S_DEF_AUTO].val))
1004 continue;
1005 break;
1006 default:
1007 break;
1008 }
1009 } else {
1010 /*
1011 * If there is no old value, only 'no' (unset)
1012 * is allowed as new value.
1013 */
1014 switch (sym->type) {
1015 case S_BOOLEAN:
1016 case S_TRISTATE:
1017 if (sym_get_tristate_value(sym) == no)
1018 continue;
1019 break;
1020 default:
1021 break;
1022 }
1023 }
1024 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1025 /* There is neither an old nor a new value. */
1026 continue;
1027 /* else
1028 * There is an old value, but no new value ('no' (unset)
1029 * isn't saved in auto.conf, so the old value is always
1030 * different from 'no').
1031 */
1032
1033 res = conf_touch_dep(sym->name);
1034 if (res)
1035 return res;
1036 }
1037
1038 return 0;
1039}
1040
1041int conf_write_autoconf(int overwrite)
1042{
1043 struct symbol *sym;
1044 const char *name;
1045 const char *autoconf_name = conf_get_autoconfig_name();
1046 FILE *out, *out_h;
1047 int i;
1048
1049 if (!overwrite && is_present(autoconf_name))
1050 return 0;
1051
1052 conf_write_dep("include/config/auto.conf.cmd");
1053
1054 if (conf_touch_deps())
1055 return 1;
1056
1057 out = fopen(".tmpconfig", "w");
1058 if (!out)
1059 return 1;
1060
1061 out_h = fopen(".tmpconfig.h", "w");
1062 if (!out_h) {
1063 fclose(out);
1064 return 1;
1065 }
1066
1067 conf_write_heading(out, &kconfig_printer_cb, NULL);
1068 conf_write_heading(out_h, &header_printer_cb, NULL);
1069
1070 for_all_symbols(i, sym) {
1071 sym_calc_value(sym);
1072 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1073 continue;
1074
1075 /* write symbols to auto.conf and autoconf.h */
1076 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1077 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1078 }
1079 fclose(out);
1080 fclose(out_h);
1081
1082 name = getenv("KCONFIG_AUTOHEADER");
1083 if (!name)
1084 name = "include/generated/autoconf.h";
1085 if (make_parent_dir(name))
1086 return 1;
1087 if (rename(".tmpconfig.h", name))
1088 return 1;
1089
1090 if (make_parent_dir(autoconf_name))
1091 return 1;
1092 /*
1093 * This must be the last step, kbuild has a dependency on auto.conf
1094 * and this marks the successful completion of the previous steps.
1095 */
1096 if (rename(".tmpconfig", autoconf_name))
1097 return 1;
1098
1099 return 0;
1100}
1101
1102static int sym_change_count;
1103static void (*conf_changed_callback)(void);
1104
1105void sym_set_change_count(int count)
1106{
1107 int _sym_change_count = sym_change_count;
1108 sym_change_count = count;
1109 if (conf_changed_callback &&
1110 (bool)_sym_change_count != (bool)count)
1111 conf_changed_callback();
1112}
1113
1114void sym_add_change_count(int count)
1115{
1116 sym_set_change_count(count + sym_change_count);
1117}
1118
1119bool conf_get_changed(void)
1120{
1121 return sym_change_count;
1122}
1123
1124void conf_set_changed_callback(void (*fn)(void))
1125{
1126 conf_changed_callback = fn;
1127}
1128
1129static bool randomize_choice_values(struct symbol *csym)
1130{
1131 struct property *prop;
1132 struct symbol *sym;
1133 struct expr *e;
1134 int cnt, def;
1135
1136 /*
1137 * If choice is mod then we may have more items selected
1138 * and if no then no-one.
1139 * In both cases stop.
1140 */
1141 if (csym->curr.tri != yes)
1142 return false;
1143
1144 prop = sym_get_choice_prop(csym);
1145
1146 /* count entries in choice block */
1147 cnt = 0;
1148 expr_list_for_each_sym(prop->expr, e, sym)
1149 cnt++;
1150
1151 /*
1152 * find a random value and set it to yes,
1153 * set the rest to no so we have only one set
1154 */
1155 def = (rand() % cnt);
1156
1157 cnt = 0;
1158 expr_list_for_each_sym(prop->expr, e, sym) {
1159 if (def == cnt++) {
1160 sym->def[S_DEF_USER].tri = yes;
1161 csym->def[S_DEF_USER].val = sym;
1162 }
1163 else {
1164 sym->def[S_DEF_USER].tri = no;
1165 }
1166 sym->flags |= SYMBOL_DEF_USER;
1167 /* clear VALID to get value calculated */
1168 sym->flags &= ~SYMBOL_VALID;
1169 }
1170 csym->flags |= SYMBOL_DEF_USER;
1171 /* clear VALID to get value calculated */
1172 csym->flags &= ~(SYMBOL_VALID);
1173
1174 return true;
1175}
1176
1177void set_all_choice_values(struct symbol *csym)
1178{
1179 struct property *prop;
1180 struct symbol *sym;
1181 struct expr *e;
1182
1183 prop = sym_get_choice_prop(csym);
1184
1185 /*
1186 * Set all non-assinged choice values to no
1187 */
1188 expr_list_for_each_sym(prop->expr, e, sym) {
1189 if (!sym_has_value(sym))
1190 sym->def[S_DEF_USER].tri = no;
1191 }
1192 csym->flags |= SYMBOL_DEF_USER;
1193 /* clear VALID to get value calculated */
1194 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1195}
1196
1197bool conf_set_all_new_symbols(enum conf_def_mode mode)
1198{
1199 struct symbol *sym, *csym;
1200 int i, cnt, pby, pty, ptm; /* pby: probability of bool = y
1201 * pty: probability of tristate = y
1202 * ptm: probability of tristate = m
1203 */
1204
1205 pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1206 * below, otherwise gcc whines about
1207 * -Wmaybe-uninitialized */
1208 if (mode == def_random) {
1209 int n, p[3];
1210 char *env = getenv("KCONFIG_PROBABILITY");
1211 n = 0;
1212 while( env && *env ) {
1213 char *endp;
1214 int tmp = strtol( env, &endp, 10 );
1215 if( tmp >= 0 && tmp <= 100 ) {
1216 p[n++] = tmp;
1217 } else {
1218 errno = ERANGE;
1219 perror( "KCONFIG_PROBABILITY" );
1220 exit( 1 );
1221 }
1222 env = (*endp == ':') ? endp+1 : endp;
1223 if( n >=3 ) {
1224 break;
1225 }
1226 }
1227 switch( n ) {
1228 case 1:
1229 pby = p[0]; ptm = pby/2; pty = pby-ptm;
1230 break;
1231 case 2:
1232 pty = p[0]; ptm = p[1]; pby = pty + ptm;
1233 break;
1234 case 3:
1235 pby = p[0]; pty = p[1]; ptm = p[2];
1236 break;
1237 }
1238
1239 if( pty+ptm > 100 ) {
1240 errno = ERANGE;
1241 perror( "KCONFIG_PROBABILITY" );
1242 exit( 1 );
1243 }
1244 }
1245 bool has_changed = false;
1246
1247 for_all_symbols(i, sym) {
1248 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1249 continue;
1250 switch (sym_get_type(sym)) {
1251 case S_BOOLEAN:
1252 case S_TRISTATE:
1253 has_changed = true;
1254 switch (mode) {
1255 case def_yes:
1256 sym->def[S_DEF_USER].tri = yes;
1257 break;
1258 case def_mod:
1259 sym->def[S_DEF_USER].tri = mod;
1260 break;
1261 case def_no:
1262 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1263 sym->def[S_DEF_USER].tri = yes;
1264 else
1265 sym->def[S_DEF_USER].tri = no;
1266 break;
1267 case def_random:
1268 sym->def[S_DEF_USER].tri = no;
1269 cnt = rand() % 100;
1270 if (sym->type == S_TRISTATE) {
1271 if (cnt < pty)
1272 sym->def[S_DEF_USER].tri = yes;
1273 else if (cnt < (pty+ptm))
1274 sym->def[S_DEF_USER].tri = mod;
1275 } else if (cnt < pby)
1276 sym->def[S_DEF_USER].tri = yes;
1277 break;
1278 default:
1279 continue;
1280 }
1281 if (!(sym_is_choice(sym) && mode == def_random))
1282 sym->flags |= SYMBOL_DEF_USER;
1283 break;
1284 default:
1285 break;
1286 }
1287
1288 }
1289
1290 sym_clear_all_valid();
1291
1292 /*
1293 * We have different type of choice blocks.
1294 * If curr.tri equals to mod then we can select several
1295 * choice symbols in one block.
1296 * In this case we do nothing.
1297 * If curr.tri equals yes then only one symbol can be
1298 * selected in a choice block and we set it to yes,
1299 * and the rest to no.
1300 */
1301 if (mode != def_random) {
1302 for_all_symbols(i, csym) {
1303 if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1304 sym_is_choice_value(csym))
1305 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1306 }
1307 }
1308
1309 for_all_symbols(i, csym) {
1310 if (sym_has_value(csym) || !sym_is_choice(csym))
1311 continue;
1312
1313 sym_calc_value(csym);
1314 if (mode == def_random)
1315 has_changed |= randomize_choice_values(csym);
1316 else {
1317 set_all_choice_values(csym);
1318 has_changed = true;
1319 }
1320 }
1321
1322 return has_changed;
1323}
1324
1325void conf_rewrite_mod_or_yes(enum conf_def_mode mode)
1326{
1327 struct symbol *sym;
1328 int i;
1329 tristate old_val = (mode == def_y2m) ? yes : mod;
1330 tristate new_val = (mode == def_y2m) ? mod : yes;
1331
1332 for_all_symbols(i, sym) {
1333 if (sym_get_type(sym) == S_TRISTATE &&
1334 sym->def[S_DEF_USER].tri == old_val)
1335 sym->def[S_DEF_USER].tri = new_val;
1336 }
1337 sym_clear_all_valid();
1338}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <ctype.h>
10#include <errno.h>
11#include <fcntl.h>
12#include <limits.h>
13#include <stdarg.h>
14#include <stdbool.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <string.h>
18#include <time.h>
19#include <unistd.h>
20
21#include <xalloc.h>
22#include "internal.h"
23#include "lkc.h"
24
25struct gstr autoconf_cmd;
26
27/* return true if 'path' exists, false otherwise */
28static bool is_present(const char *path)
29{
30 struct stat st;
31
32 return !stat(path, &st);
33}
34
35/* return true if 'path' exists and it is a directory, false otherwise */
36static bool is_dir(const char *path)
37{
38 struct stat st;
39
40 if (stat(path, &st))
41 return false;
42
43 return S_ISDIR(st.st_mode);
44}
45
46/* return true if the given two files are the same, false otherwise */
47static bool is_same(const char *file1, const char *file2)
48{
49 int fd1, fd2;
50 struct stat st1, st2;
51 void *map1, *map2;
52 bool ret = false;
53
54 fd1 = open(file1, O_RDONLY);
55 if (fd1 < 0)
56 return ret;
57
58 fd2 = open(file2, O_RDONLY);
59 if (fd2 < 0)
60 goto close1;
61
62 ret = fstat(fd1, &st1);
63 if (ret)
64 goto close2;
65 ret = fstat(fd2, &st2);
66 if (ret)
67 goto close2;
68
69 if (st1.st_size != st2.st_size)
70 goto close2;
71
72 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
73 if (map1 == MAP_FAILED)
74 goto close2;
75
76 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
77 if (map2 == MAP_FAILED)
78 goto close2;
79
80 if (bcmp(map1, map2, st1.st_size))
81 goto close2;
82
83 ret = true;
84close2:
85 close(fd2);
86close1:
87 close(fd1);
88
89 return ret;
90}
91
92/*
93 * Create the parent directory of the given path.
94 *
95 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
96 */
97static int make_parent_dir(const char *path)
98{
99 char tmp[PATH_MAX + 1];
100 char *p;
101
102 strncpy(tmp, path, sizeof(tmp));
103 tmp[sizeof(tmp) - 1] = 0;
104
105 /* Remove the base name. Just return if nothing is left */
106 p = strrchr(tmp, '/');
107 if (!p)
108 return 0;
109 *(p + 1) = 0;
110
111 /* Just in case it is an absolute path */
112 p = tmp;
113 while (*p == '/')
114 p++;
115
116 while ((p = strchr(p, '/'))) {
117 *p = 0;
118
119 /* skip if the directory exists */
120 if (!is_dir(tmp) && mkdir(tmp, 0755))
121 return -1;
122
123 *p = '/';
124 while (*p == '/')
125 p++;
126 }
127
128 return 0;
129}
130
131static char depfile_path[PATH_MAX];
132static size_t depfile_prefix_len;
133
134/* touch depfile for symbol 'name' */
135static int conf_touch_dep(const char *name)
136{
137 int fd;
138
139 /* check overflow: prefix + name + '\0' must fit in buffer. */
140 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
141 return -1;
142
143 strcpy(depfile_path + depfile_prefix_len, name);
144
145 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
146 if (fd == -1)
147 return -1;
148 close(fd);
149
150 return 0;
151}
152
153static void conf_warning(const char *fmt, ...)
154 __attribute__ ((format (printf, 1, 2)));
155
156static void conf_message(const char *fmt, ...)
157 __attribute__ ((format (printf, 1, 2)));
158
159static const char *conf_filename;
160static int conf_lineno, conf_warnings;
161
162bool conf_errors(void)
163{
164 if (conf_warnings)
165 return getenv("KCONFIG_WERROR");
166 return false;
167}
168
169static void conf_warning(const char *fmt, ...)
170{
171 va_list ap;
172 va_start(ap, fmt);
173 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
174 vfprintf(stderr, fmt, ap);
175 fprintf(stderr, "\n");
176 va_end(ap);
177 conf_warnings++;
178}
179
180static void conf_default_message_callback(const char *s)
181{
182 printf("#\n# ");
183 printf("%s", s);
184 printf("\n#\n");
185}
186
187static void (*conf_message_callback)(const char *s) =
188 conf_default_message_callback;
189void conf_set_message_callback(void (*fn)(const char *s))
190{
191 conf_message_callback = fn;
192}
193
194static void conf_message(const char *fmt, ...)
195{
196 va_list ap;
197 char buf[4096];
198
199 if (!conf_message_callback)
200 return;
201
202 va_start(ap, fmt);
203
204 vsnprintf(buf, sizeof(buf), fmt, ap);
205 conf_message_callback(buf);
206 va_end(ap);
207}
208
209const char *conf_get_configname(void)
210{
211 char *name = getenv("KCONFIG_CONFIG");
212
213 return name ? name : ".config";
214}
215
216static const char *conf_get_autoconfig_name(void)
217{
218 char *name = getenv("KCONFIG_AUTOCONFIG");
219
220 return name ? name : "include/config/auto.conf";
221}
222
223static const char *conf_get_autoheader_name(void)
224{
225 char *name = getenv("KCONFIG_AUTOHEADER");
226
227 return name ? name : "include/generated/autoconf.h";
228}
229
230static const char *conf_get_rustccfg_name(void)
231{
232 char *name = getenv("KCONFIG_RUSTCCFG");
233
234 return name ? name : "include/generated/rustc_cfg";
235}
236
237static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
238{
239 char *p2;
240
241 switch (sym->type) {
242 case S_TRISTATE:
243 if (p[0] == 'm') {
244 sym->def[def].tri = mod;
245 sym->flags |= def_flags;
246 break;
247 }
248 /* fall through */
249 case S_BOOLEAN:
250 if (p[0] == 'y') {
251 sym->def[def].tri = yes;
252 sym->flags |= def_flags;
253 break;
254 }
255 if (p[0] == 'n') {
256 sym->def[def].tri = no;
257 sym->flags |= def_flags;
258 break;
259 }
260 if (def != S_DEF_AUTO)
261 conf_warning("symbol value '%s' invalid for %s",
262 p, sym->name);
263 return 1;
264 case S_STRING:
265 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
266 if (def != S_DEF_AUTO) {
267 if (*p++ != '"')
268 break;
269 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
270 if (*p2 == '"') {
271 *p2 = 0;
272 break;
273 }
274 memmove(p2, p2 + 1, strlen(p2));
275 }
276 if (!p2) {
277 conf_warning("invalid string found");
278 return 1;
279 }
280 }
281 /* fall through */
282 case S_INT:
283 case S_HEX:
284 if (sym_string_valid(sym, p)) {
285 sym->def[def].val = xstrdup(p);
286 sym->flags |= def_flags;
287 } else {
288 if (def != S_DEF_AUTO)
289 conf_warning("symbol value '%s' invalid for %s",
290 p, sym->name);
291 return 1;
292 }
293 break;
294 default:
295 ;
296 }
297 return 0;
298}
299
300/* like getline(), but the newline character is stripped away */
301static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
302{
303 ssize_t len;
304
305 len = getline(lineptr, n, stream);
306
307 if (len > 0 && (*lineptr)[len - 1] == '\n') {
308 len--;
309 (*lineptr)[len] = '\0';
310
311 if (len > 0 && (*lineptr)[len - 1] == '\r') {
312 len--;
313 (*lineptr)[len] = '\0';
314 }
315 }
316
317 return len;
318}
319
320int conf_read_simple(const char *name, int def)
321{
322 FILE *in = NULL;
323 char *line = NULL;
324 size_t line_asize = 0;
325 char *p, *val;
326 struct symbol *sym;
327 int def_flags;
328 const char *warn_unknown, *sym_name;
329
330 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
331 if (name) {
332 in = zconf_fopen(name);
333 } else {
334 char *env;
335
336 name = conf_get_configname();
337 in = zconf_fopen(name);
338 if (in)
339 goto load;
340 conf_set_changed(true);
341
342 env = getenv("KCONFIG_DEFCONFIG_LIST");
343 if (!env)
344 return 1;
345
346 while (1) {
347 bool is_last;
348
349 while (isspace(*env))
350 env++;
351
352 if (!*env)
353 break;
354
355 p = env;
356 while (*p && !isspace(*p))
357 p++;
358
359 is_last = (*p == '\0');
360
361 *p = '\0';
362
363 name = env;
364
365 in = zconf_fopen(name);
366 if (in) {
367 conf_message("using defaults found in %s",
368 name);
369 goto load;
370 }
371
372 if (is_last)
373 break;
374
375 env = p + 1;
376 }
377 }
378 if (!in)
379 return 1;
380
381load:
382 conf_filename = name;
383 conf_lineno = 0;
384 conf_warnings = 0;
385
386 def_flags = SYMBOL_DEF << def;
387 for_all_symbols(sym) {
388 sym->flags &= ~(def_flags|SYMBOL_VALID);
389 switch (sym->type) {
390 case S_INT:
391 case S_HEX:
392 case S_STRING:
393 free(sym->def[def].val);
394 /* fall through */
395 default:
396 sym->def[def].val = NULL;
397 sym->def[def].tri = no;
398 }
399 }
400
401 expr_invalidate_all();
402
403 while (getline_stripped(&line, &line_asize, in) != -1) {
404 struct menu *choice;
405
406 conf_lineno++;
407
408 if (!line[0]) /* blank line */
409 continue;
410
411 if (line[0] == '#') {
412 if (line[1] != ' ')
413 continue;
414 p = line + 2;
415 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
416 continue;
417 sym_name = p + strlen(CONFIG_);
418 p = strchr(sym_name, ' ');
419 if (!p)
420 continue;
421 *p++ = 0;
422 if (strcmp(p, "is not set"))
423 continue;
424
425 val = "n";
426 } else {
427 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
428 conf_warning("unexpected data: %s", line);
429 continue;
430 }
431
432 sym_name = line + strlen(CONFIG_);
433 p = strchr(sym_name, '=');
434 if (!p) {
435 conf_warning("unexpected data: %s", line);
436 continue;
437 }
438 *p = 0;
439 val = p + 1;
440 }
441
442 sym = sym_find(sym_name);
443 if (!sym) {
444 if (def == S_DEF_AUTO) {
445 /*
446 * Reading from include/config/auto.conf.
447 * If CONFIG_FOO previously existed in auto.conf
448 * but it is missing now, include/config/FOO
449 * must be touched.
450 */
451 conf_touch_dep(sym_name);
452 } else {
453 if (warn_unknown)
454 conf_warning("unknown symbol: %s", sym_name);
455
456 conf_set_changed(true);
457 }
458 continue;
459 }
460
461 if (sym->flags & def_flags)
462 conf_warning("override: reassigning to symbol %s", sym->name);
463
464 if (conf_set_sym_val(sym, def, def_flags, val))
465 continue;
466
467 /*
468 * If this is a choice member, give it the highest priority.
469 * If conflicting CONFIG options are given from an input file,
470 * the last one wins.
471 */
472 choice = sym_get_choice_menu(sym);
473 if (choice)
474 list_move(&sym->choice_link, &choice->choice_members);
475 }
476 free(line);
477 fclose(in);
478
479 return 0;
480}
481
482int conf_read(const char *name)
483{
484 struct symbol *sym;
485
486 conf_set_changed(false);
487
488 if (conf_read_simple(name, S_DEF_USER)) {
489 sym_calc_value(modules_sym);
490 return 1;
491 }
492
493 sym_calc_value(modules_sym);
494
495 for_all_symbols(sym) {
496 sym_calc_value(sym);
497 if (sym_is_choice(sym))
498 continue;
499 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
500 /* check that calculated value agrees with saved value */
501 switch (sym->type) {
502 case S_BOOLEAN:
503 case S_TRISTATE:
504 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
505 continue;
506 break;
507 default:
508 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
509 continue;
510 break;
511 }
512 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
513 /* no previous value and not saved */
514 continue;
515 conf_set_changed(true);
516 /* maybe print value in verbose mode... */
517 }
518
519 if (conf_warnings)
520 conf_set_changed(true);
521
522 return 0;
523}
524
525struct comment_style {
526 const char *decoration;
527 const char *prefix;
528 const char *postfix;
529};
530
531static const struct comment_style comment_style_pound = {
532 .decoration = "#",
533 .prefix = "#",
534 .postfix = "#",
535};
536
537static const struct comment_style comment_style_c = {
538 .decoration = " *",
539 .prefix = "/*",
540 .postfix = " */",
541};
542
543static void conf_write_heading(FILE *fp, const struct comment_style *cs)
544{
545 if (!cs)
546 return;
547
548 fprintf(fp, "%s\n", cs->prefix);
549
550 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
551 cs->decoration);
552
553 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
554
555 fprintf(fp, "%s\n", cs->postfix);
556}
557
558/* The returned pointer must be freed on the caller side */
559static char *escape_string_value(const char *in)
560{
561 const char *p;
562 char *out;
563 size_t len;
564
565 len = strlen(in) + strlen("\"\"") + 1;
566
567 p = in;
568 while (1) {
569 p += strcspn(p, "\"\\");
570
571 if (p[0] == '\0')
572 break;
573
574 len++;
575 p++;
576 }
577
578 out = xmalloc(len);
579 out[0] = '\0';
580
581 strcat(out, "\"");
582
583 p = in;
584 while (1) {
585 len = strcspn(p, "\"\\");
586 strncat(out, p, len);
587 p += len;
588
589 if (p[0] == '\0')
590 break;
591
592 strcat(out, "\\");
593 strncat(out, p++, 1);
594 }
595
596 strcat(out, "\"");
597
598 return out;
599}
600
601enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
602
603static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
604 bool escape_string)
605{
606 const char *val;
607 char *escaped = NULL;
608
609 if (sym->type == S_UNKNOWN)
610 return;
611
612 val = sym_get_string_value(sym);
613
614 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
615 output_n != OUTPUT_N && *val == 'n') {
616 if (output_n == OUTPUT_N_AS_UNSET)
617 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
618 return;
619 }
620
621 if (sym->type == S_STRING && escape_string) {
622 escaped = escape_string_value(val);
623 val = escaped;
624 }
625
626 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
627
628 free(escaped);
629}
630
631static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
632{
633 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
634}
635
636static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
637{
638 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
639}
640
641void print_symbol_for_listconfig(struct symbol *sym)
642{
643 __print_symbol(stdout, sym, OUTPUT_N, true);
644}
645
646static void print_symbol_for_c(FILE *fp, struct symbol *sym)
647{
648 const char *val;
649 const char *sym_suffix = "";
650 const char *val_prefix = "";
651 char *escaped = NULL;
652
653 if (sym->type == S_UNKNOWN)
654 return;
655
656 val = sym_get_string_value(sym);
657
658 switch (sym->type) {
659 case S_BOOLEAN:
660 case S_TRISTATE:
661 switch (*val) {
662 case 'n':
663 return;
664 case 'm':
665 sym_suffix = "_MODULE";
666 /* fall through */
667 default:
668 val = "1";
669 }
670 break;
671 case S_HEX:
672 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
673 val_prefix = "0x";
674 break;
675 case S_STRING:
676 escaped = escape_string_value(val);
677 val = escaped;
678 default:
679 break;
680 }
681
682 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
683 val_prefix, val);
684
685 free(escaped);
686}
687
688static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
689{
690 const char *val;
691 const char *val_prefix = "";
692 char *val_prefixed = NULL;
693 size_t val_prefixed_len;
694 char *escaped = NULL;
695
696 if (sym->type == S_UNKNOWN)
697 return;
698
699 val = sym_get_string_value(sym);
700
701 switch (sym->type) {
702 case S_BOOLEAN:
703 case S_TRISTATE:
704 /*
705 * We do not care about disabled ones, i.e. no need for
706 * what otherwise are "comments" in other printers.
707 */
708 if (*val == 'n')
709 return;
710
711 /*
712 * To have similar functionality to the C macro `IS_ENABLED()`
713 * we provide an empty `--cfg CONFIG_X` here in both `y`
714 * and `m` cases.
715 *
716 * Then, the common `fprintf()` below will also give us
717 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
718 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
719 */
720 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
721 break;
722 case S_HEX:
723 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
724 val_prefix = "0x";
725 break;
726 default:
727 break;
728 }
729
730 if (strlen(val_prefix) > 0) {
731 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
732 val_prefixed = xmalloc(val_prefixed_len);
733 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
734 val = val_prefixed;
735 }
736
737 /* All values get escaped: the `--cfg` option only takes strings */
738 escaped = escape_string_value(val);
739 val = escaped;
740
741 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
742
743 free(escaped);
744 free(val_prefixed);
745}
746
747/*
748 * Write out a minimal config.
749 * All values that has default values are skipped as this is redundant.
750 */
751int conf_write_defconfig(const char *filename)
752{
753 struct symbol *sym;
754 struct menu *menu;
755 FILE *out;
756
757 out = fopen(filename, "w");
758 if (!out)
759 return 1;
760
761 sym_clear_all_valid();
762
763 menu_for_each_entry(menu) {
764 struct menu *choice;
765
766 sym = menu->sym;
767
768 if (!sym || sym_is_choice(sym))
769 continue;
770
771 sym_calc_value(sym);
772 if (!(sym->flags & SYMBOL_WRITE))
773 continue;
774 sym->flags &= ~SYMBOL_WRITE;
775 /* Skip unchangeable symbols */
776 if (!sym_is_changeable(sym))
777 continue;
778 /* Skip symbols that are equal to the default */
779 if (!strcmp(sym_get_string_value(sym), sym_get_string_default(sym)))
780 continue;
781
782 /* Skip choice values that are equal to the default */
783 choice = sym_get_choice_menu(sym);
784 if (choice) {
785 struct symbol *ds;
786
787 ds = sym_choice_default(choice);
788 if (sym == ds && sym_get_tristate_value(sym) == yes)
789 continue;
790 }
791 print_symbol_for_dotconfig(out, sym);
792 }
793 fclose(out);
794 return 0;
795}
796
797int conf_write(const char *name)
798{
799 FILE *out;
800 struct symbol *sym;
801 struct menu *menu;
802 const char *str;
803 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
804 char *env;
805 bool need_newline = false;
806
807 if (!name)
808 name = conf_get_configname();
809
810 if (!*name) {
811 fprintf(stderr, "config name is empty\n");
812 return -1;
813 }
814
815 if (is_dir(name)) {
816 fprintf(stderr, "%s: Is a directory\n", name);
817 return -1;
818 }
819
820 if (make_parent_dir(name))
821 return -1;
822
823 env = getenv("KCONFIG_OVERWRITECONFIG");
824 if (env && *env) {
825 *tmpname = 0;
826 out = fopen(name, "w");
827 } else {
828 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
829 name, (int)getpid());
830 out = fopen(tmpname, "w");
831 }
832 if (!out)
833 return 1;
834
835 conf_write_heading(out, &comment_style_pound);
836
837 if (!conf_get_changed())
838 sym_clear_all_valid();
839
840 menu = rootmenu.list;
841 while (menu) {
842 sym = menu->sym;
843 if (!sym) {
844 if (!menu_is_visible(menu))
845 goto next;
846 str = menu_get_prompt(menu);
847 fprintf(out, "\n"
848 "#\n"
849 "# %s\n"
850 "#\n", str);
851 need_newline = false;
852 } else if (!sym_is_choice(sym) &&
853 !(sym->flags & SYMBOL_WRITTEN)) {
854 sym_calc_value(sym);
855 if (!(sym->flags & SYMBOL_WRITE))
856 goto next;
857 if (need_newline) {
858 fprintf(out, "\n");
859 need_newline = false;
860 }
861 sym->flags |= SYMBOL_WRITTEN;
862 print_symbol_for_dotconfig(out, sym);
863 }
864
865next:
866 if (menu->list) {
867 menu = menu->list;
868 continue;
869 }
870
871end_check:
872 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
873 menu->prompt->type == P_MENU) {
874 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
875 need_newline = true;
876 }
877
878 if (menu->next) {
879 menu = menu->next;
880 } else {
881 menu = menu->parent;
882 if (menu)
883 goto end_check;
884 }
885 }
886 fclose(out);
887
888 for_all_symbols(sym)
889 sym->flags &= ~SYMBOL_WRITTEN;
890
891 if (*tmpname) {
892 if (is_same(name, tmpname)) {
893 conf_message("No change to %s", name);
894 unlink(tmpname);
895 conf_set_changed(false);
896 return 0;
897 }
898
899 snprintf(oldname, sizeof(oldname), "%s.old", name);
900 rename(name, oldname);
901 if (rename(tmpname, name))
902 return 1;
903 }
904
905 conf_message("configuration written to %s", name);
906
907 conf_set_changed(false);
908
909 return 0;
910}
911
912/* write a dependency file as used by kbuild to track dependencies */
913static int conf_write_autoconf_cmd(const char *autoconf_name)
914{
915 char name[PATH_MAX], tmp[PATH_MAX];
916 FILE *out;
917 int ret;
918
919 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
920 if (ret >= sizeof(name)) /* check truncation */
921 return -1;
922
923 if (make_parent_dir(name))
924 return -1;
925
926 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
927 if (ret >= sizeof(tmp)) /* check truncation */
928 return -1;
929
930 out = fopen(tmp, "w");
931 if (!out) {
932 perror("fopen");
933 return -1;
934 }
935
936 fprintf(out, "autoconfig := %s\n", autoconf_name);
937
938 fputs(str_get(&autoconf_cmd), out);
939
940 fflush(out);
941 ret = ferror(out); /* error check for all fprintf() calls */
942 fclose(out);
943 if (ret)
944 return -1;
945
946 if (rename(tmp, name)) {
947 perror("rename");
948 return -1;
949 }
950
951 return 0;
952}
953
954static int conf_touch_deps(void)
955{
956 const char *name, *tmp;
957 struct symbol *sym;
958 int res;
959
960 name = conf_get_autoconfig_name();
961 tmp = strrchr(name, '/');
962 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
963 if (depfile_prefix_len + 1 > sizeof(depfile_path))
964 return -1;
965
966 strncpy(depfile_path, name, depfile_prefix_len);
967 depfile_path[depfile_prefix_len] = 0;
968
969 conf_read_simple(name, S_DEF_AUTO);
970 sym_calc_value(modules_sym);
971
972 for_all_symbols(sym) {
973 sym_calc_value(sym);
974 if (sym_is_choice(sym))
975 continue;
976 if (sym->flags & SYMBOL_WRITE) {
977 if (sym->flags & SYMBOL_DEF_AUTO) {
978 /*
979 * symbol has old and new value,
980 * so compare them...
981 */
982 switch (sym->type) {
983 case S_BOOLEAN:
984 case S_TRISTATE:
985 if (sym_get_tristate_value(sym) ==
986 sym->def[S_DEF_AUTO].tri)
987 continue;
988 break;
989 case S_STRING:
990 case S_HEX:
991 case S_INT:
992 if (!strcmp(sym_get_string_value(sym),
993 sym->def[S_DEF_AUTO].val))
994 continue;
995 break;
996 default:
997 break;
998 }
999 } else {
1000 /*
1001 * If there is no old value, only 'no' (unset)
1002 * is allowed as new value.
1003 */
1004 switch (sym->type) {
1005 case S_BOOLEAN:
1006 case S_TRISTATE:
1007 if (sym_get_tristate_value(sym) == no)
1008 continue;
1009 break;
1010 default:
1011 break;
1012 }
1013 }
1014 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1015 /* There is neither an old nor a new value. */
1016 continue;
1017 /* else
1018 * There is an old value, but no new value ('no' (unset)
1019 * isn't saved in auto.conf, so the old value is always
1020 * different from 'no').
1021 */
1022
1023 res = conf_touch_dep(sym->name);
1024 if (res)
1025 return res;
1026 }
1027
1028 return 0;
1029}
1030
1031static int __conf_write_autoconf(const char *filename,
1032 void (*print_symbol)(FILE *, struct symbol *),
1033 const struct comment_style *comment_style)
1034{
1035 char tmp[PATH_MAX];
1036 FILE *file;
1037 struct symbol *sym;
1038 int ret;
1039
1040 if (make_parent_dir(filename))
1041 return -1;
1042
1043 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1044 if (ret >= sizeof(tmp)) /* check truncation */
1045 return -1;
1046
1047 file = fopen(tmp, "w");
1048 if (!file) {
1049 perror("fopen");
1050 return -1;
1051 }
1052
1053 conf_write_heading(file, comment_style);
1054
1055 for_all_symbols(sym)
1056 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1057 print_symbol(file, sym);
1058
1059 fflush(file);
1060 /* check possible errors in conf_write_heading() and print_symbol() */
1061 ret = ferror(file);
1062 fclose(file);
1063 if (ret)
1064 return -1;
1065
1066 if (rename(tmp, filename)) {
1067 perror("rename");
1068 return -1;
1069 }
1070
1071 return 0;
1072}
1073
1074int conf_write_autoconf(int overwrite)
1075{
1076 struct symbol *sym;
1077 const char *autoconf_name = conf_get_autoconfig_name();
1078 int ret;
1079
1080 if (!overwrite && is_present(autoconf_name))
1081 return 0;
1082
1083 ret = conf_write_autoconf_cmd(autoconf_name);
1084 if (ret)
1085 return -1;
1086
1087 if (conf_touch_deps())
1088 return 1;
1089
1090 for_all_symbols(sym)
1091 sym_calc_value(sym);
1092
1093 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1094 print_symbol_for_c,
1095 &comment_style_c);
1096 if (ret)
1097 return ret;
1098
1099 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1100 print_symbol_for_rustccfg,
1101 NULL);
1102 if (ret)
1103 return ret;
1104
1105 /*
1106 * Create include/config/auto.conf. This must be the last step because
1107 * Kbuild has a dependency on auto.conf and this marks the successful
1108 * completion of the previous steps.
1109 */
1110 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1111 print_symbol_for_autoconf,
1112 &comment_style_pound);
1113 if (ret)
1114 return ret;
1115
1116 return 0;
1117}
1118
1119static bool conf_changed;
1120static void (*conf_changed_callback)(bool);
1121
1122void conf_set_changed(bool val)
1123{
1124 if (conf_changed_callback && conf_changed != val)
1125 conf_changed_callback(val);
1126
1127 conf_changed = val;
1128}
1129
1130bool conf_get_changed(void)
1131{
1132 return conf_changed;
1133}
1134
1135void conf_set_changed_callback(void (*fn)(bool))
1136{
1137 conf_changed_callback = fn;
1138}