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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 "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}