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
713 /*
714 * Tristate printer
715 *
716 * This printer is used when generating the `include/config/tristate.conf' file.
717 */
718 static void
tristate_print_symbol(FILE * fp,struct symbol * sym,const char * value,void * arg)719 tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
720 {
721
722 if (sym->type == S_TRISTATE && *value != 'n')
723 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
724 }
725
726 static struct conf_printer tristate_printer_cb =
727 {
728 .print_symbol = tristate_print_symbol,
729 .print_comment = kconfig_print_comment,
730 };
731
conf_write_symbol(FILE * fp,struct symbol * sym,struct conf_printer * printer,void * printer_arg)732 static void conf_write_symbol(FILE *fp, struct symbol *sym,
733 struct conf_printer *printer, void *printer_arg)
734 {
735 const char *str;
736
737 switch (sym->type) {
738 case S_UNKNOWN:
739 break;
740 case S_STRING:
741 str = sym_get_string_value(sym);
742 str = sym_escape_string_value(str);
743 printer->print_symbol(fp, sym, str, printer_arg);
744 free((void *)str);
745 break;
746 default:
747 str = sym_get_string_value(sym);
748 printer->print_symbol(fp, sym, str, printer_arg);
749 }
750 }
751
752 static void
conf_write_heading(FILE * fp,struct conf_printer * printer,void * printer_arg)753 conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
754 {
755 char buf[256];
756
757 snprintf(buf, sizeof(buf),
758 "\n"
759 "Automatically generated file; DO NOT EDIT.\n"
760 "%s\n",
761 rootmenu.prompt->text);
762
763 printer->print_comment(fp, buf, printer_arg);
764 }
765
766 /*
767 * Write out a minimal config.
768 * All values that has default values are skipped as this is redundant.
769 */
conf_write_defconfig(const char * filename)770 int conf_write_defconfig(const char *filename)
771 {
772 struct symbol *sym;
773 struct menu *menu;
774 FILE *out;
775
776 out = fopen(filename, "w");
777 if (!out)
778 return 1;
779
780 sym_clear_all_valid();
781
782 /* Traverse all menus to find all relevant symbols */
783 menu = rootmenu.list;
784
785 while (menu != NULL)
786 {
787 sym = menu->sym;
788 if (sym == NULL) {
789 if (!menu_is_visible(menu))
790 goto next_menu;
791 } else if (!sym_is_choice(sym)) {
792 sym_calc_value(sym);
793 if (!(sym->flags & SYMBOL_WRITE))
794 goto next_menu;
795 sym->flags &= ~SYMBOL_WRITE;
796 /* If we cannot change the symbol - skip */
797 if (!sym_is_changeable(sym))
798 goto next_menu;
799 /* If symbol equals to default value - skip */
800 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
801 goto next_menu;
802
803 /*
804 * If symbol is a choice value and equals to the
805 * default for a choice - skip.
806 * But only if value is bool and equal to "y" and
807 * choice is not "optional".
808 * (If choice is "optional" then all values can be "n")
809 */
810 if (sym_is_choice_value(sym)) {
811 struct symbol *cs;
812 struct symbol *ds;
813
814 cs = prop_get_symbol(sym_get_choice_prop(sym));
815 ds = sym_choice_default(cs);
816 if (!sym_is_optional(cs) && sym == ds) {
817 if ((sym->type == S_BOOLEAN) &&
818 sym_get_tristate_value(sym) == yes)
819 goto next_menu;
820 }
821 }
822 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
823 }
824 next_menu:
825 if (menu->list != NULL) {
826 menu = menu->list;
827 }
828 else if (menu->next != NULL) {
829 menu = menu->next;
830 } else {
831 while ((menu = menu->parent)) {
832 if (menu->next != NULL) {
833 menu = menu->next;
834 break;
835 }
836 }
837 }
838 }
839 fclose(out);
840 return 0;
841 }
842
conf_write(const char * name)843 int conf_write(const char *name)
844 {
845 FILE *out;
846 struct symbol *sym;
847 struct menu *menu;
848 const char *str;
849 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
850 char *env;
851 int i;
852 bool need_newline = false;
853
854 if (!name)
855 name = conf_get_configname();
856
857 if (!*name) {
858 fprintf(stderr, "config name is empty\n");
859 return -1;
860 }
861
862 if (is_dir(name)) {
863 fprintf(stderr, "%s: Is a directory\n", name);
864 return -1;
865 }
866
867 if (make_parent_dir(name))
868 return -1;
869
870 env = getenv("KCONFIG_OVERWRITECONFIG");
871 if (env && *env) {
872 *tmpname = 0;
873 out = fopen(name, "w");
874 } else {
875 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
876 name, (int)getpid());
877 out = fopen(tmpname, "w");
878 }
879 if (!out)
880 return 1;
881
882 conf_write_heading(out, &kconfig_printer_cb, NULL);
883
884 if (!conf_get_changed())
885 sym_clear_all_valid();
886
887 menu = rootmenu.list;
888 while (menu) {
889 sym = menu->sym;
890 if (!sym) {
891 if (!menu_is_visible(menu))
892 goto next;
893 str = menu_get_prompt(menu);
894 fprintf(out, "\n"
895 "#\n"
896 "# %s\n"
897 "#\n", str);
898 need_newline = false;
899 } else if (!(sym->flags & SYMBOL_CHOICE) &&
900 !(sym->flags & SYMBOL_WRITTEN)) {
901 sym_calc_value(sym);
902 if (!(sym->flags & SYMBOL_WRITE))
903 goto next;
904 if (need_newline) {
905 fprintf(out, "\n");
906 need_newline = false;
907 }
908 sym->flags |= SYMBOL_WRITTEN;
909 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
910 }
911
912 next:
913 if (menu->list) {
914 menu = menu->list;
915 continue;
916 }
917 if (menu->next)
918 menu = menu->next;
919 else while ((menu = menu->parent)) {
920 if (!menu->sym && menu_is_visible(menu) &&
921 menu != &rootmenu) {
922 str = menu_get_prompt(menu);
923 fprintf(out, "# end of %s\n", str);
924 need_newline = true;
925 }
926 if (menu->next) {
927 menu = menu->next;
928 break;
929 }
930 }
931 }
932 fclose(out);
933
934 for_all_symbols(i, sym)
935 sym->flags &= ~SYMBOL_WRITTEN;
936
937 if (*tmpname) {
938 if (is_same(name, tmpname)) {
939 conf_message("No change to %s", name);
940 unlink(tmpname);
941 sym_set_change_count(0);
942 return 0;
943 }
944
945 snprintf(oldname, sizeof(oldname), "%s.old", name);
946 rename(name, oldname);
947 if (rename(tmpname, name))
948 return 1;
949 }
950
951 conf_message("configuration written to %s", name);
952
953 sym_set_change_count(0);
954
955 return 0;
956 }
957
958 /* write a dependency file as used by kbuild to track dependencies */
conf_write_dep(const char * name)959 static int conf_write_dep(const char *name)
960 {
961 struct file *file;
962 FILE *out;
963
964 out = fopen("..config.tmp", "w");
965 if (!out)
966 return 1;
967 fprintf(out, "deps_config := \\\n");
968 for (file = file_list; file; file = file->next) {
969 if (file->next)
970 fprintf(out, "\t%s \\\n", file->name);
971 else
972 fprintf(out, "\t%s\n", file->name);
973 }
974 fprintf(out, "\n%s: \\\n"
975 "\t$(deps_config)\n\n", conf_get_autoconfig_name());
976
977 env_write_dep(out, conf_get_autoconfig_name());
978
979 fprintf(out, "\n$(deps_config): ;\n");
980 fclose(out);
981
982 if (make_parent_dir(name))
983 return 1;
984 rename("..config.tmp", name);
985 return 0;
986 }
987
conf_touch_deps(void)988 static int conf_touch_deps(void)
989 {
990 const char *name;
991 struct symbol *sym;
992 int res, i;
993
994 strcpy(depfile_path, "include/config/");
995 depfile_prefix_len = strlen(depfile_path);
996
997 name = conf_get_autoconfig_name();
998 conf_read_simple(name, S_DEF_AUTO);
999 sym_calc_value(modules_sym);
1000
1001 for_all_symbols(i, sym) {
1002 sym_calc_value(sym);
1003 if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1004 continue;
1005 if (sym->flags & SYMBOL_WRITE) {
1006 if (sym->flags & SYMBOL_DEF_AUTO) {
1007 /*
1008 * symbol has old and new value,
1009 * so compare them...
1010 */
1011 switch (sym->type) {
1012 case S_BOOLEAN:
1013 case S_TRISTATE:
1014 if (sym_get_tristate_value(sym) ==
1015 sym->def[S_DEF_AUTO].tri)
1016 continue;
1017 break;
1018 case S_STRING:
1019 case S_HEX:
1020 case S_INT:
1021 if (!strcmp(sym_get_string_value(sym),
1022 sym->def[S_DEF_AUTO].val))
1023 continue;
1024 break;
1025 default:
1026 break;
1027 }
1028 } else {
1029 /*
1030 * If there is no old value, only 'no' (unset)
1031 * is allowed as new value.
1032 */
1033 switch (sym->type) {
1034 case S_BOOLEAN:
1035 case S_TRISTATE:
1036 if (sym_get_tristate_value(sym) == no)
1037 continue;
1038 break;
1039 default:
1040 break;
1041 }
1042 }
1043 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1044 /* There is neither an old nor a new value. */
1045 continue;
1046 /* else
1047 * There is an old value, but no new value ('no' (unset)
1048 * isn't saved in auto.conf, so the old value is always
1049 * different from 'no').
1050 */
1051
1052 res = conf_touch_dep(sym->name);
1053 if (res)
1054 return res;
1055 }
1056
1057 return 0;
1058 }
1059
conf_write_autoconf(int overwrite)1060 int conf_write_autoconf(int overwrite)
1061 {
1062 struct symbol *sym;
1063 const char *name;
1064 const char *autoconf_name = conf_get_autoconfig_name();
1065 FILE *out, *tristate, *out_h;
1066 int i;
1067
1068 if (!overwrite && is_present(autoconf_name))
1069 return 0;
1070
1071 conf_write_dep("include/config/auto.conf.cmd");
1072
1073 if (conf_touch_deps())
1074 return 1;
1075
1076 out = fopen(".tmpconfig", "w");
1077 if (!out)
1078 return 1;
1079
1080 tristate = fopen(".tmpconfig_tristate", "w");
1081 if (!tristate) {
1082 fclose(out);
1083 return 1;
1084 }
1085
1086 out_h = fopen(".tmpconfig.h", "w");
1087 if (!out_h) {
1088 fclose(out);
1089 fclose(tristate);
1090 return 1;
1091 }
1092
1093 conf_write_heading(out, &kconfig_printer_cb, NULL);
1094
1095 conf_write_heading(tristate, &tristate_printer_cb, NULL);
1096
1097 conf_write_heading(out_h, &header_printer_cb, NULL);
1098
1099 for_all_symbols(i, sym) {
1100 sym_calc_value(sym);
1101 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1102 continue;
1103
1104 /* write symbol to auto.conf, tristate and header files */
1105 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1106
1107 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1108
1109 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1110 }
1111 fclose(out);
1112 fclose(tristate);
1113 fclose(out_h);
1114
1115 name = getenv("KCONFIG_AUTOHEADER");
1116 if (!name)
1117 name = "include/generated/autoconf.h";
1118 if (make_parent_dir(name))
1119 return 1;
1120 if (rename(".tmpconfig.h", name))
1121 return 1;
1122
1123 name = getenv("KCONFIG_TRISTATE");
1124 if (!name)
1125 name = "include/config/tristate.conf";
1126 if (make_parent_dir(name))
1127 return 1;
1128 if (rename(".tmpconfig_tristate", name))
1129 return 1;
1130
1131 if (make_parent_dir(autoconf_name))
1132 return 1;
1133 /*
1134 * This must be the last step, kbuild has a dependency on auto.conf
1135 * and this marks the successful completion of the previous steps.
1136 */
1137 if (rename(".tmpconfig", autoconf_name))
1138 return 1;
1139
1140 return 0;
1141 }
1142
1143 static int sym_change_count;
1144 static void (*conf_changed_callback)(void);
1145
sym_set_change_count(int count)1146 void sym_set_change_count(int count)
1147 {
1148 int _sym_change_count = sym_change_count;
1149 sym_change_count = count;
1150 if (conf_changed_callback &&
1151 (bool)_sym_change_count != (bool)count)
1152 conf_changed_callback();
1153 }
1154
sym_add_change_count(int count)1155 void sym_add_change_count(int count)
1156 {
1157 sym_set_change_count(count + sym_change_count);
1158 }
1159
conf_get_changed(void)1160 bool conf_get_changed(void)
1161 {
1162 return sym_change_count;
1163 }
1164
conf_set_changed_callback(void (* fn)(void))1165 void conf_set_changed_callback(void (*fn)(void))
1166 {
1167 conf_changed_callback = fn;
1168 }
1169
randomize_choice_values(struct symbol * csym)1170 static bool randomize_choice_values(struct symbol *csym)
1171 {
1172 struct property *prop;
1173 struct symbol *sym;
1174 struct expr *e;
1175 int cnt, def;
1176
1177 /*
1178 * If choice is mod then we may have more items selected
1179 * and if no then no-one.
1180 * In both cases stop.
1181 */
1182 if (csym->curr.tri != yes)
1183 return false;
1184
1185 prop = sym_get_choice_prop(csym);
1186
1187 /* count entries in choice block */
1188 cnt = 0;
1189 expr_list_for_each_sym(prop->expr, e, sym)
1190 cnt++;
1191
1192 /*
1193 * find a random value and set it to yes,
1194 * set the rest to no so we have only one set
1195 */
1196 def = (rand() % cnt);
1197
1198 cnt = 0;
1199 expr_list_for_each_sym(prop->expr, e, sym) {
1200 if (def == cnt++) {
1201 sym->def[S_DEF_USER].tri = yes;
1202 csym->def[S_DEF_USER].val = sym;
1203 }
1204 else {
1205 sym->def[S_DEF_USER].tri = no;
1206 }
1207 sym->flags |= SYMBOL_DEF_USER;
1208 /* clear VALID to get value calculated */
1209 sym->flags &= ~SYMBOL_VALID;
1210 }
1211 csym->flags |= SYMBOL_DEF_USER;
1212 /* clear VALID to get value calculated */
1213 csym->flags &= ~(SYMBOL_VALID);
1214
1215 return true;
1216 }
1217
set_all_choice_values(struct symbol * csym)1218 void set_all_choice_values(struct symbol *csym)
1219 {
1220 struct property *prop;
1221 struct symbol *sym;
1222 struct expr *e;
1223
1224 prop = sym_get_choice_prop(csym);
1225
1226 /*
1227 * Set all non-assinged choice values to no
1228 */
1229 expr_list_for_each_sym(prop->expr, e, sym) {
1230 if (!sym_has_value(sym))
1231 sym->def[S_DEF_USER].tri = no;
1232 }
1233 csym->flags |= SYMBOL_DEF_USER;
1234 /* clear VALID to get value calculated */
1235 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1236 }
1237
conf_set_all_new_symbols(enum conf_def_mode mode)1238 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1239 {
1240 struct symbol *sym, *csym;
1241 int i, cnt, pby, pty, ptm; /* pby: probability of bool = y
1242 * pty: probability of tristate = y
1243 * ptm: probability of tristate = m
1244 */
1245
1246 pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1247 * below, otherwise gcc whines about
1248 * -Wmaybe-uninitialized */
1249 if (mode == def_random) {
1250 int n, p[3];
1251 char *env = getenv("KCONFIG_PROBABILITY");
1252 n = 0;
1253 while( env && *env ) {
1254 char *endp;
1255 int tmp = strtol( env, &endp, 10 );
1256 if( tmp >= 0 && tmp <= 100 ) {
1257 p[n++] = tmp;
1258 } else {
1259 errno = ERANGE;
1260 perror( "KCONFIG_PROBABILITY" );
1261 exit( 1 );
1262 }
1263 env = (*endp == ':') ? endp+1 : endp;
1264 if( n >=3 ) {
1265 break;
1266 }
1267 }
1268 switch( n ) {
1269 case 1:
1270 pby = p[0]; ptm = pby/2; pty = pby-ptm;
1271 break;
1272 case 2:
1273 pty = p[0]; ptm = p[1]; pby = pty + ptm;
1274 break;
1275 case 3:
1276 pby = p[0]; pty = p[1]; ptm = p[2];
1277 break;
1278 }
1279
1280 if( pty+ptm > 100 ) {
1281 errno = ERANGE;
1282 perror( "KCONFIG_PROBABILITY" );
1283 exit( 1 );
1284 }
1285 }
1286 bool has_changed = false;
1287
1288 for_all_symbols(i, sym) {
1289 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1290 continue;
1291 switch (sym_get_type(sym)) {
1292 case S_BOOLEAN:
1293 case S_TRISTATE:
1294 has_changed = true;
1295 switch (mode) {
1296 case def_yes:
1297 sym->def[S_DEF_USER].tri = yes;
1298 break;
1299 case def_mod:
1300 sym->def[S_DEF_USER].tri = mod;
1301 break;
1302 case def_no:
1303 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1304 sym->def[S_DEF_USER].tri = yes;
1305 else
1306 sym->def[S_DEF_USER].tri = no;
1307 break;
1308 case def_random:
1309 sym->def[S_DEF_USER].tri = no;
1310 cnt = rand() % 100;
1311 if (sym->type == S_TRISTATE) {
1312 if (cnt < pty)
1313 sym->def[S_DEF_USER].tri = yes;
1314 else if (cnt < (pty+ptm))
1315 sym->def[S_DEF_USER].tri = mod;
1316 } else if (cnt < pby)
1317 sym->def[S_DEF_USER].tri = yes;
1318 break;
1319 default:
1320 continue;
1321 }
1322 if (!(sym_is_choice(sym) && mode == def_random))
1323 sym->flags |= SYMBOL_DEF_USER;
1324 break;
1325 default:
1326 break;
1327 }
1328
1329 }
1330
1331 sym_clear_all_valid();
1332
1333 /*
1334 * We have different type of choice blocks.
1335 * If curr.tri equals to mod then we can select several
1336 * choice symbols in one block.
1337 * In this case we do nothing.
1338 * If curr.tri equals yes then only one symbol can be
1339 * selected in a choice block and we set it to yes,
1340 * and the rest to no.
1341 */
1342 if (mode != def_random) {
1343 for_all_symbols(i, csym) {
1344 if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1345 sym_is_choice_value(csym))
1346 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1347 }
1348 }
1349
1350 for_all_symbols(i, csym) {
1351 if (sym_has_value(csym) || !sym_is_choice(csym))
1352 continue;
1353
1354 sym_calc_value(csym);
1355 if (mode == def_random)
1356 has_changed = randomize_choice_values(csym);
1357 else {
1358 set_all_choice_values(csym);
1359 has_changed = true;
1360 }
1361 }
1362
1363 return has_changed;
1364 }
1365