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 */
is_present(const char * path)22 static 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 */
is_dir(const char * path)30 static 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 */
is_same(const char * file1,const char * file2)41 static 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;
78 close2:
79 close(fd2);
80 close1:
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 */
make_parent_dir(const char * path)91 static 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
125 static char depfile_path[PATH_MAX];
126 static size_t depfile_prefix_len;
127
128 /* touch depfile for symbol 'name' */
conf_touch_dep(const char * name)129 static 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
166 struct conf_printer {
167 void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
168 void (*print_comment)(FILE *, const char *, void *);
169 };
170
171 static void conf_warning(const char *fmt, ...)
172 __attribute__ ((format (printf, 1, 2)));
173
174 static void conf_message(const char *fmt, ...)
175 __attribute__ ((format (printf, 1, 2)));
176
177 static const char *conf_filename;
178 static int conf_lineno, conf_warnings;
179
conf_warning(const char * fmt,...)180 static 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
conf_default_message_callback(const char * s)191 static void conf_default_message_callback(const char *s)
192 {
193 printf("#\n# ");
194 printf("%s", s);
195 printf("\n#\n");
196 }
197
198 static void (*conf_message_callback)(const char *s) =
199 conf_default_message_callback;
conf_set_message_callback(void (* fn)(const char * s))200 void conf_set_message_callback(void (*fn)(const char *s))
201 {
202 conf_message_callback = fn;
203 }
204
conf_message(const char * fmt,...)205 static 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
conf_get_configname(void)220 const char *conf_get_configname(void)
221 {
222 char *name = getenv("KCONFIG_CONFIG");
223
224 return name ? name : ".config";
225 }
226
conf_get_autoconfig_name(void)227 static 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
conf_set_sym_val(struct symbol * sym,int def,int def_flags,char * p)234 static 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
add_byte(int c,char ** lineptr,size_t slen,size_t * n)296 static 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
compat_getline(char ** lineptr,size_t * n,FILE * stream)316 static 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
344 e_out:
345 line[slen-1] = '\0';
346 *lineptr = line;
347 return -1;
348 }
349
conf_read_simple(const char * name,int def)350 int 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
389 load:
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
conf_read(const char * name)513 int 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 */
590 static void
kconfig_print_symbol(FILE * fp,struct symbol * sym,const char * value,void * arg)591 kconfig_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
613 static void
kconfig_print_comment(FILE * fp,const char * value,void * arg)614 kconfig_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
633 static 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 */
644 static void
header_print_symbol(FILE * fp,struct symbol * sym,const char * value,void * arg)645 header_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
685 static void
header_print_comment(FILE * fp,const char * value,void * arg)686 header_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
707 static struct conf_printer header_printer_cb =
708 {
709 .print_symbol = header_print_symbol,
710 .print_comment = header_print_comment,
711 };
712
conf_write_symbol(FILE * fp,struct symbol * sym,struct conf_printer * printer,void * printer_arg)713 static 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
733 static void
conf_write_heading(FILE * fp,struct conf_printer * printer,void * printer_arg)734 conf_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 */
conf_write_defconfig(const char * filename)751 int 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 }
805 next_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
conf_write(const char * name)824 int 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
893 next:
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 */
conf_write_dep(const char * name)940 static 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
conf_touch_deps(void)969 static 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
conf_write_autoconf(int overwrite)1041 int 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
1102 static int sym_change_count;
1103 static void (*conf_changed_callback)(void);
1104
sym_set_change_count(int count)1105 void 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
sym_add_change_count(int count)1114 void sym_add_change_count(int count)
1115 {
1116 sym_set_change_count(count + sym_change_count);
1117 }
1118
conf_get_changed(void)1119 bool conf_get_changed(void)
1120 {
1121 return sym_change_count;
1122 }
1123
conf_set_changed_callback(void (* fn)(void))1124 void conf_set_changed_callback(void (*fn)(void))
1125 {
1126 conf_changed_callback = fn;
1127 }
1128
randomize_choice_values(struct symbol * csym)1129 static 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
set_all_choice_values(struct symbol * csym)1177 void 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
conf_set_all_new_symbols(enum conf_def_mode mode)1197 bool 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
conf_rewrite_mod_or_yes(enum conf_def_mode mode)1325 void 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 }
1339
