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1/*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6#include <sys/stat.h>
7#include <ctype.h>
8#include <errno.h>
9#include <fcntl.h>
10#include <stdarg.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <time.h>
15#include <unistd.h>
16
17#include "lkc.h"
18
19struct conf_printer {
20 void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
21 void (*print_comment)(FILE *, const char *, void *);
22};
23
24static void conf_warning(const char *fmt, ...)
25 __attribute__ ((format (printf, 1, 2)));
26
27static void conf_message(const char *fmt, ...)
28 __attribute__ ((format (printf, 1, 2)));
29
30static const char *conf_filename;
31static int conf_lineno, conf_warnings;
32
33const char conf_defname[] = "arch/$ARCH/defconfig";
34
35static void conf_warning(const char *fmt, ...)
36{
37 va_list ap;
38 va_start(ap, fmt);
39 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
40 vfprintf(stderr, fmt, ap);
41 fprintf(stderr, "\n");
42 va_end(ap);
43 conf_warnings++;
44}
45
46static void conf_default_message_callback(const char *fmt, va_list ap)
47{
48 printf("#\n# ");
49 vprintf(fmt, ap);
50 printf("\n#\n");
51}
52
53static void (*conf_message_callback) (const char *fmt, va_list ap) =
54 conf_default_message_callback;
55void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
56{
57 conf_message_callback = fn;
58}
59
60static void conf_message(const char *fmt, ...)
61{
62 va_list ap;
63
64 va_start(ap, fmt);
65 if (conf_message_callback)
66 conf_message_callback(fmt, ap);
67 va_end(ap);
68}
69
70const char *conf_get_configname(void)
71{
72 char *name = getenv("KCONFIG_CONFIG");
73
74 return name ? name : ".config";
75}
76
77const char *conf_get_autoconfig_name(void)
78{
79 char *name = getenv("KCONFIG_AUTOCONFIG");
80
81 return name ? name : "include/config/auto.conf";
82}
83
84static char *conf_expand_value(const char *in)
85{
86 struct symbol *sym;
87 const char *src;
88 static char res_value[SYMBOL_MAXLENGTH];
89 char *dst, name[SYMBOL_MAXLENGTH];
90
91 res_value[0] = 0;
92 dst = name;
93 while ((src = strchr(in, '$'))) {
94 strncat(res_value, in, src - in);
95 src++;
96 dst = name;
97 while (isalnum(*src) || *src == '_')
98 *dst++ = *src++;
99 *dst = 0;
100 sym = sym_lookup(name, 0);
101 sym_calc_value(sym);
102 strcat(res_value, sym_get_string_value(sym));
103 in = src;
104 }
105 strcat(res_value, in);
106
107 return res_value;
108}
109
110char *conf_get_default_confname(void)
111{
112 struct stat buf;
113 static char fullname[PATH_MAX+1];
114 char *env, *name;
115
116 name = conf_expand_value(conf_defname);
117 env = getenv(SRCTREE);
118 if (env) {
119 sprintf(fullname, "%s/%s", env, name);
120 if (!stat(fullname, &buf))
121 return fullname;
122 }
123 return name;
124}
125
126static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
127{
128 char *p2;
129
130 switch (sym->type) {
131 case S_TRISTATE:
132 if (p[0] == 'm') {
133 sym->def[def].tri = mod;
134 sym->flags |= def_flags;
135 break;
136 }
137 /* fall through */
138 case S_BOOLEAN:
139 if (p[0] == 'y') {
140 sym->def[def].tri = yes;
141 sym->flags |= def_flags;
142 break;
143 }
144 if (p[0] == 'n') {
145 sym->def[def].tri = no;
146 sym->flags |= def_flags;
147 break;
148 }
149 if (def != S_DEF_AUTO)
150 conf_warning("symbol value '%s' invalid for %s",
151 p, sym->name);
152 return 1;
153 case S_OTHER:
154 if (*p != '"') {
155 for (p2 = p; *p2 && !isspace(*p2); p2++)
156 ;
157 sym->type = S_STRING;
158 goto done;
159 }
160 /* fall through */
161 case S_STRING:
162 if (*p++ != '"')
163 break;
164 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
165 if (*p2 == '"') {
166 *p2 = 0;
167 break;
168 }
169 memmove(p2, p2 + 1, strlen(p2));
170 }
171 if (!p2) {
172 if (def != S_DEF_AUTO)
173 conf_warning("invalid string found");
174 return 1;
175 }
176 /* fall through */
177 case S_INT:
178 case S_HEX:
179 done:
180 if (sym_string_valid(sym, p)) {
181 sym->def[def].val = xstrdup(p);
182 sym->flags |= def_flags;
183 } else {
184 if (def != S_DEF_AUTO)
185 conf_warning("symbol value '%s' invalid for %s",
186 p, sym->name);
187 return 1;
188 }
189 break;
190 default:
191 ;
192 }
193 return 0;
194}
195
196#define LINE_GROWTH 16
197static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
198{
199 char *nline;
200 size_t new_size = slen + 1;
201 if (new_size > *n) {
202 new_size += LINE_GROWTH - 1;
203 new_size *= 2;
204 nline = xrealloc(*lineptr, new_size);
205 if (!nline)
206 return -1;
207
208 *lineptr = nline;
209 *n = new_size;
210 }
211
212 (*lineptr)[slen] = c;
213
214 return 0;
215}
216
217static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream)
218{
219 char *line = *lineptr;
220 size_t slen = 0;
221
222 for (;;) {
223 int c = getc(stream);
224
225 switch (c) {
226 case '\n':
227 if (add_byte(c, &line, slen, n) < 0)
228 goto e_out;
229 slen++;
230 /* fall through */
231 case EOF:
232 if (add_byte('\0', &line, slen, n) < 0)
233 goto e_out;
234 *lineptr = line;
235 if (slen == 0)
236 return -1;
237 return slen;
238 default:
239 if (add_byte(c, &line, slen, n) < 0)
240 goto e_out;
241 slen++;
242 }
243 }
244
245e_out:
246 line[slen-1] = '\0';
247 *lineptr = line;
248 return -1;
249}
250
251int conf_read_simple(const char *name, int def)
252{
253 FILE *in = NULL;
254 char *line = NULL;
255 size_t line_asize = 0;
256 char *p, *p2;
257 struct symbol *sym;
258 int i, def_flags;
259
260 if (name) {
261 in = zconf_fopen(name);
262 } else {
263 struct property *prop;
264
265 name = conf_get_configname();
266 in = zconf_fopen(name);
267 if (in)
268 goto load;
269 sym_add_change_count(1);
270 if (!sym_defconfig_list)
271 return 1;
272
273 for_all_defaults(sym_defconfig_list, prop) {
274 if (expr_calc_value(prop->visible.expr) == no ||
275 prop->expr->type != E_SYMBOL)
276 continue;
277 name = conf_expand_value(prop->expr->left.sym->name);
278 in = zconf_fopen(name);
279 if (in) {
280 conf_message(_("using defaults found in %s"),
281 name);
282 goto load;
283 }
284 }
285 }
286 if (!in)
287 return 1;
288
289load:
290 conf_filename = name;
291 conf_lineno = 0;
292 conf_warnings = 0;
293
294 def_flags = SYMBOL_DEF << def;
295 for_all_symbols(i, sym) {
296 sym->flags |= SYMBOL_CHANGED;
297 sym->flags &= ~(def_flags|SYMBOL_VALID);
298 if (sym_is_choice(sym))
299 sym->flags |= def_flags;
300 switch (sym->type) {
301 case S_INT:
302 case S_HEX:
303 case S_STRING:
304 if (sym->def[def].val)
305 free(sym->def[def].val);
306 /* fall through */
307 default:
308 sym->def[def].val = NULL;
309 sym->def[def].tri = no;
310 }
311 }
312
313 while (compat_getline(&line, &line_asize, in) != -1) {
314 conf_lineno++;
315 sym = NULL;
316 if (line[0] == '#') {
317 if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
318 continue;
319 p = strchr(line + 2 + strlen(CONFIG_), ' ');
320 if (!p)
321 continue;
322 *p++ = 0;
323 if (strncmp(p, "is not set", 10))
324 continue;
325 if (def == S_DEF_USER) {
326 sym = sym_find(line + 2 + strlen(CONFIG_));
327 if (!sym) {
328 sym_add_change_count(1);
329 goto setsym;
330 }
331 } else {
332 sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
333 if (sym->type == S_UNKNOWN)
334 sym->type = S_BOOLEAN;
335 }
336 if (sym->flags & def_flags) {
337 conf_warning("override: reassigning to symbol %s", sym->name);
338 }
339 switch (sym->type) {
340 case S_BOOLEAN:
341 case S_TRISTATE:
342 sym->def[def].tri = no;
343 sym->flags |= def_flags;
344 break;
345 default:
346 ;
347 }
348 } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
349 p = strchr(line + strlen(CONFIG_), '=');
350 if (!p)
351 continue;
352 *p++ = 0;
353 p2 = strchr(p, '\n');
354 if (p2) {
355 *p2-- = 0;
356 if (*p2 == '\r')
357 *p2 = 0;
358 }
359 if (def == S_DEF_USER) {
360 sym = sym_find(line + strlen(CONFIG_));
361 if (!sym) {
362 sym_add_change_count(1);
363 goto setsym;
364 }
365 } else {
366 sym = sym_lookup(line + strlen(CONFIG_), 0);
367 if (sym->type == S_UNKNOWN)
368 sym->type = S_OTHER;
369 }
370 if (sym->flags & def_flags) {
371 conf_warning("override: reassigning to symbol %s", sym->name);
372 }
373 if (conf_set_sym_val(sym, def, def_flags, p))
374 continue;
375 } else {
376 if (line[0] != '\r' && line[0] != '\n')
377 conf_warning("unexpected data: %.*s",
378 (int)strcspn(line, "\r\n"), line);
379
380 continue;
381 }
382setsym:
383 if (sym && sym_is_choice_value(sym)) {
384 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
385 switch (sym->def[def].tri) {
386 case no:
387 break;
388 case mod:
389 if (cs->def[def].tri == yes) {
390 conf_warning("%s creates inconsistent choice state", sym->name);
391 cs->flags &= ~def_flags;
392 }
393 break;
394 case yes:
395 if (cs->def[def].tri != no)
396 conf_warning("override: %s changes choice state", sym->name);
397 cs->def[def].val = sym;
398 break;
399 }
400 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
401 }
402 }
403 free(line);
404 fclose(in);
405 return 0;
406}
407
408int conf_read(const char *name)
409{
410 struct symbol *sym;
411 int conf_unsaved = 0;
412 int i;
413
414 sym_set_change_count(0);
415
416 if (conf_read_simple(name, S_DEF_USER)) {
417 sym_calc_value(modules_sym);
418 return 1;
419 }
420
421 sym_calc_value(modules_sym);
422
423 for_all_symbols(i, sym) {
424 sym_calc_value(sym);
425 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
426 continue;
427 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
428 /* check that calculated value agrees with saved value */
429 switch (sym->type) {
430 case S_BOOLEAN:
431 case S_TRISTATE:
432 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
433 break;
434 if (!sym_is_choice(sym))
435 continue;
436 /* fall through */
437 default:
438 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
439 continue;
440 break;
441 }
442 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
443 /* no previous value and not saved */
444 continue;
445 conf_unsaved++;
446 /* maybe print value in verbose mode... */
447 }
448
449 for_all_symbols(i, sym) {
450 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
451 /* Reset values of generates values, so they'll appear
452 * as new, if they should become visible, but that
453 * doesn't quite work if the Kconfig and the saved
454 * configuration disagree.
455 */
456 if (sym->visible == no && !conf_unsaved)
457 sym->flags &= ~SYMBOL_DEF_USER;
458 switch (sym->type) {
459 case S_STRING:
460 case S_INT:
461 case S_HEX:
462 /* Reset a string value if it's out of range */
463 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
464 break;
465 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
466 conf_unsaved++;
467 break;
468 default:
469 break;
470 }
471 }
472 }
473
474 sym_add_change_count(conf_warnings || conf_unsaved);
475
476 return 0;
477}
478
479/*
480 * Kconfig configuration printer
481 *
482 * This printer is used when generating the resulting configuration after
483 * kconfig invocation and `defconfig' files. Unset symbol might be omitted by
484 * passing a non-NULL argument to the printer.
485 *
486 */
487static void
488kconfig_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
489{
490
491 switch (sym->type) {
492 case S_BOOLEAN:
493 case S_TRISTATE:
494 if (*value == 'n') {
495 bool skip_unset = (arg != NULL);
496
497 if (!skip_unset)
498 fprintf(fp, "# %s%s is not set\n",
499 CONFIG_, sym->name);
500 return;
501 }
502 break;
503 default:
504 break;
505 }
506
507 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
508}
509
510static void
511kconfig_print_comment(FILE *fp, const char *value, void *arg)
512{
513 const char *p = value;
514 size_t l;
515
516 for (;;) {
517 l = strcspn(p, "\n");
518 fprintf(fp, "#");
519 if (l) {
520 fprintf(fp, " ");
521 xfwrite(p, l, 1, fp);
522 p += l;
523 }
524 fprintf(fp, "\n");
525 if (*p++ == '\0')
526 break;
527 }
528}
529
530static struct conf_printer kconfig_printer_cb =
531{
532 .print_symbol = kconfig_print_symbol,
533 .print_comment = kconfig_print_comment,
534};
535
536/*
537 * Header printer
538 *
539 * This printer is used when generating the `include/generated/autoconf.h' file.
540 */
541static void
542header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
543{
544
545 switch (sym->type) {
546 case S_BOOLEAN:
547 case S_TRISTATE: {
548 const char *suffix = "";
549
550 switch (*value) {
551 case 'n':
552 break;
553 case 'm':
554 suffix = "_MODULE";
555 /* fall through */
556 default:
557 fprintf(fp, "#define %s%s%s 1\n",
558 CONFIG_, sym->name, suffix);
559 }
560 break;
561 }
562 case S_HEX: {
563 const char *prefix = "";
564
565 if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
566 prefix = "0x";
567 fprintf(fp, "#define %s%s %s%s\n",
568 CONFIG_, sym->name, prefix, value);
569 break;
570 }
571 case S_STRING:
572 case S_INT:
573 fprintf(fp, "#define %s%s %s\n",
574 CONFIG_, sym->name, value);
575 break;
576 default:
577 break;
578 }
579
580}
581
582static void
583header_print_comment(FILE *fp, const char *value, void *arg)
584{
585 const char *p = value;
586 size_t l;
587
588 fprintf(fp, "/*\n");
589 for (;;) {
590 l = strcspn(p, "\n");
591 fprintf(fp, " *");
592 if (l) {
593 fprintf(fp, " ");
594 xfwrite(p, l, 1, fp);
595 p += l;
596 }
597 fprintf(fp, "\n");
598 if (*p++ == '\0')
599 break;
600 }
601 fprintf(fp, " */\n");
602}
603
604static struct conf_printer header_printer_cb =
605{
606 .print_symbol = header_print_symbol,
607 .print_comment = header_print_comment,
608};
609
610/*
611 * Tristate printer
612 *
613 * This printer is used when generating the `include/config/tristate.conf' file.
614 */
615static void
616tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
617{
618
619 if (sym->type == S_TRISTATE && *value != 'n')
620 fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
621}
622
623static struct conf_printer tristate_printer_cb =
624{
625 .print_symbol = tristate_print_symbol,
626 .print_comment = kconfig_print_comment,
627};
628
629static void conf_write_symbol(FILE *fp, struct symbol *sym,
630 struct conf_printer *printer, void *printer_arg)
631{
632 const char *str;
633
634 switch (sym->type) {
635 case S_OTHER:
636 case S_UNKNOWN:
637 break;
638 case S_STRING:
639 str = sym_get_string_value(sym);
640 str = sym_escape_string_value(str);
641 printer->print_symbol(fp, sym, str, printer_arg);
642 free((void *)str);
643 break;
644 default:
645 str = sym_get_string_value(sym);
646 printer->print_symbol(fp, sym, str, printer_arg);
647 }
648}
649
650static void
651conf_write_heading(FILE *fp, struct conf_printer *printer, void *printer_arg)
652{
653 char buf[256];
654
655 snprintf(buf, sizeof(buf),
656 "\n"
657 "Automatically generated file; DO NOT EDIT.\n"
658 "%s\n",
659 rootmenu.prompt->text);
660
661 printer->print_comment(fp, buf, printer_arg);
662}
663
664/*
665 * Write out a minimal config.
666 * All values that has default values are skipped as this is redundant.
667 */
668int conf_write_defconfig(const char *filename)
669{
670 struct symbol *sym;
671 struct menu *menu;
672 FILE *out;
673
674 out = fopen(filename, "w");
675 if (!out)
676 return 1;
677
678 sym_clear_all_valid();
679
680 /* Traverse all menus to find all relevant symbols */
681 menu = rootmenu.list;
682
683 while (menu != NULL)
684 {
685 sym = menu->sym;
686 if (sym == NULL) {
687 if (!menu_is_visible(menu))
688 goto next_menu;
689 } else if (!sym_is_choice(sym)) {
690 sym_calc_value(sym);
691 if (!(sym->flags & SYMBOL_WRITE))
692 goto next_menu;
693 sym->flags &= ~SYMBOL_WRITE;
694 /* If we cannot change the symbol - skip */
695 if (!sym_is_changable(sym))
696 goto next_menu;
697 /* If symbol equals to default value - skip */
698 if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
699 goto next_menu;
700
701 /*
702 * If symbol is a choice value and equals to the
703 * default for a choice - skip.
704 * But only if value is bool and equal to "y" and
705 * choice is not "optional".
706 * (If choice is "optional" then all values can be "n")
707 */
708 if (sym_is_choice_value(sym)) {
709 struct symbol *cs;
710 struct symbol *ds;
711
712 cs = prop_get_symbol(sym_get_choice_prop(sym));
713 ds = sym_choice_default(cs);
714 if (!sym_is_optional(cs) && sym == ds) {
715 if ((sym->type == S_BOOLEAN) &&
716 sym_get_tristate_value(sym) == yes)
717 goto next_menu;
718 }
719 }
720 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
721 }
722next_menu:
723 if (menu->list != NULL) {
724 menu = menu->list;
725 }
726 else if (menu->next != NULL) {
727 menu = menu->next;
728 } else {
729 while ((menu = menu->parent)) {
730 if (menu->next != NULL) {
731 menu = menu->next;
732 break;
733 }
734 }
735 }
736 }
737 fclose(out);
738 return 0;
739}
740
741int conf_write(const char *name)
742{
743 FILE *out;
744 struct symbol *sym;
745 struct menu *menu;
746 const char *basename;
747 const char *str;
748 char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
749 char *env;
750
751 dirname[0] = 0;
752 if (name && name[0]) {
753 struct stat st;
754 char *slash;
755
756 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
757 strcpy(dirname, name);
758 strcat(dirname, "/");
759 basename = conf_get_configname();
760 } else if ((slash = strrchr(name, '/'))) {
761 int size = slash - name + 1;
762 memcpy(dirname, name, size);
763 dirname[size] = 0;
764 if (slash[1])
765 basename = slash + 1;
766 else
767 basename = conf_get_configname();
768 } else
769 basename = name;
770 } else
771 basename = conf_get_configname();
772
773 sprintf(newname, "%s%s", dirname, basename);
774 env = getenv("KCONFIG_OVERWRITECONFIG");
775 if (!env || !*env) {
776 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
777 out = fopen(tmpname, "w");
778 } else {
779 *tmpname = 0;
780 out = fopen(newname, "w");
781 }
782 if (!out)
783 return 1;
784
785 conf_write_heading(out, &kconfig_printer_cb, NULL);
786
787 if (!conf_get_changed())
788 sym_clear_all_valid();
789
790 menu = rootmenu.list;
791 while (menu) {
792 sym = menu->sym;
793 if (!sym) {
794 if (!menu_is_visible(menu))
795 goto next;
796 str = menu_get_prompt(menu);
797 fprintf(out, "\n"
798 "#\n"
799 "# %s\n"
800 "#\n", str);
801 } else if (!(sym->flags & SYMBOL_CHOICE)) {
802 sym_calc_value(sym);
803 if (!(sym->flags & SYMBOL_WRITE))
804 goto next;
805 sym->flags &= ~SYMBOL_WRITE;
806
807 conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
808 }
809
810next:
811 if (menu->list) {
812 menu = menu->list;
813 continue;
814 }
815 if (menu->next)
816 menu = menu->next;
817 else while ((menu = menu->parent)) {
818 if (menu->next) {
819 menu = menu->next;
820 break;
821 }
822 }
823 }
824 fclose(out);
825
826 if (*tmpname) {
827 strcat(dirname, basename);
828 strcat(dirname, ".old");
829 rename(newname, dirname);
830 if (rename(tmpname, newname))
831 return 1;
832 }
833
834 conf_message(_("configuration written to %s"), newname);
835
836 sym_set_change_count(0);
837
838 return 0;
839}
840
841static int conf_split_config(void)
842{
843 const char *name;
844 char path[PATH_MAX+1];
845 char *s, *d, c;
846 struct symbol *sym;
847 struct stat sb;
848 int res, i, fd;
849
850 name = conf_get_autoconfig_name();
851 conf_read_simple(name, S_DEF_AUTO);
852 sym_calc_value(modules_sym);
853
854 if (chdir("include/config"))
855 return 1;
856
857 res = 0;
858 for_all_symbols(i, sym) {
859 sym_calc_value(sym);
860 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
861 continue;
862 if (sym->flags & SYMBOL_WRITE) {
863 if (sym->flags & SYMBOL_DEF_AUTO) {
864 /*
865 * symbol has old and new value,
866 * so compare them...
867 */
868 switch (sym->type) {
869 case S_BOOLEAN:
870 case S_TRISTATE:
871 if (sym_get_tristate_value(sym) ==
872 sym->def[S_DEF_AUTO].tri)
873 continue;
874 break;
875 case S_STRING:
876 case S_HEX:
877 case S_INT:
878 if (!strcmp(sym_get_string_value(sym),
879 sym->def[S_DEF_AUTO].val))
880 continue;
881 break;
882 default:
883 break;
884 }
885 } else {
886 /*
887 * If there is no old value, only 'no' (unset)
888 * is allowed as new value.
889 */
890 switch (sym->type) {
891 case S_BOOLEAN:
892 case S_TRISTATE:
893 if (sym_get_tristate_value(sym) == no)
894 continue;
895 break;
896 default:
897 break;
898 }
899 }
900 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
901 /* There is neither an old nor a new value. */
902 continue;
903 /* else
904 * There is an old value, but no new value ('no' (unset)
905 * isn't saved in auto.conf, so the old value is always
906 * different from 'no').
907 */
908
909 /* Replace all '_' and append ".h" */
910 s = sym->name;
911 d = path;
912 while ((c = *s++)) {
913 c = tolower(c);
914 *d++ = (c == '_') ? '/' : c;
915 }
916 strcpy(d, ".h");
917
918 /* Assume directory path already exists. */
919 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
920 if (fd == -1) {
921 if (errno != ENOENT) {
922 res = 1;
923 break;
924 }
925 /*
926 * Create directory components,
927 * unless they exist already.
928 */
929 d = path;
930 while ((d = strchr(d, '/'))) {
931 *d = 0;
932 if (stat(path, &sb) && mkdir(path, 0755)) {
933 res = 1;
934 goto out;
935 }
936 *d++ = '/';
937 }
938 /* Try it again. */
939 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
940 if (fd == -1) {
941 res = 1;
942 break;
943 }
944 }
945 close(fd);
946 }
947out:
948 if (chdir("../.."))
949 return 1;
950
951 return res;
952}
953
954int conf_write_autoconf(void)
955{
956 struct symbol *sym;
957 const char *name;
958 FILE *out, *tristate, *out_h;
959 int i;
960
961 sym_clear_all_valid();
962
963 file_write_dep("include/config/auto.conf.cmd");
964
965 if (conf_split_config())
966 return 1;
967
968 out = fopen(".tmpconfig", "w");
969 if (!out)
970 return 1;
971
972 tristate = fopen(".tmpconfig_tristate", "w");
973 if (!tristate) {
974 fclose(out);
975 return 1;
976 }
977
978 out_h = fopen(".tmpconfig.h", "w");
979 if (!out_h) {
980 fclose(out);
981 fclose(tristate);
982 return 1;
983 }
984
985 conf_write_heading(out, &kconfig_printer_cb, NULL);
986
987 conf_write_heading(tristate, &tristate_printer_cb, NULL);
988
989 conf_write_heading(out_h, &header_printer_cb, NULL);
990
991 for_all_symbols(i, sym) {
992 sym_calc_value(sym);
993 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
994 continue;
995
996 /* write symbol to auto.conf, tristate and header files */
997 conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
998
999 conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1000
1001 conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1002 }
1003 fclose(out);
1004 fclose(tristate);
1005 fclose(out_h);
1006
1007 name = getenv("KCONFIG_AUTOHEADER");
1008 if (!name)
1009 name = "include/generated/autoconf.h";
1010 if (rename(".tmpconfig.h", name))
1011 return 1;
1012 name = getenv("KCONFIG_TRISTATE");
1013 if (!name)
1014 name = "include/config/tristate.conf";
1015 if (rename(".tmpconfig_tristate", name))
1016 return 1;
1017 name = conf_get_autoconfig_name();
1018 /*
1019 * This must be the last step, kbuild has a dependency on auto.conf
1020 * and this marks the successful completion of the previous steps.
1021 */
1022 if (rename(".tmpconfig", name))
1023 return 1;
1024
1025 return 0;
1026}
1027
1028static int sym_change_count;
1029static void (*conf_changed_callback)(void);
1030
1031void sym_set_change_count(int count)
1032{
1033 int _sym_change_count = sym_change_count;
1034 sym_change_count = count;
1035 if (conf_changed_callback &&
1036 (bool)_sym_change_count != (bool)count)
1037 conf_changed_callback();
1038}
1039
1040void sym_add_change_count(int count)
1041{
1042 sym_set_change_count(count + sym_change_count);
1043}
1044
1045bool conf_get_changed(void)
1046{
1047 return sym_change_count;
1048}
1049
1050void conf_set_changed_callback(void (*fn)(void))
1051{
1052 conf_changed_callback = fn;
1053}
1054
1055static bool randomize_choice_values(struct symbol *csym)
1056{
1057 struct property *prop;
1058 struct symbol *sym;
1059 struct expr *e;
1060 int cnt, def;
1061
1062 /*
1063 * If choice is mod then we may have more items selected
1064 * and if no then no-one.
1065 * In both cases stop.
1066 */
1067 if (csym->curr.tri != yes)
1068 return false;
1069
1070 prop = sym_get_choice_prop(csym);
1071
1072 /* count entries in choice block */
1073 cnt = 0;
1074 expr_list_for_each_sym(prop->expr, e, sym)
1075 cnt++;
1076
1077 /*
1078 * find a random value and set it to yes,
1079 * set the rest to no so we have only one set
1080 */
1081 def = (rand() % cnt);
1082
1083 cnt = 0;
1084 expr_list_for_each_sym(prop->expr, e, sym) {
1085 if (def == cnt++) {
1086 sym->def[S_DEF_USER].tri = yes;
1087 csym->def[S_DEF_USER].val = sym;
1088 }
1089 else {
1090 sym->def[S_DEF_USER].tri = no;
1091 }
1092 sym->flags |= SYMBOL_DEF_USER;
1093 /* clear VALID to get value calculated */
1094 sym->flags &= ~SYMBOL_VALID;
1095 }
1096 csym->flags |= SYMBOL_DEF_USER;
1097 /* clear VALID to get value calculated */
1098 csym->flags &= ~(SYMBOL_VALID);
1099
1100 return true;
1101}
1102
1103void set_all_choice_values(struct symbol *csym)
1104{
1105 struct property *prop;
1106 struct symbol *sym;
1107 struct expr *e;
1108
1109 prop = sym_get_choice_prop(csym);
1110
1111 /*
1112 * Set all non-assinged choice values to no
1113 */
1114 expr_list_for_each_sym(prop->expr, e, sym) {
1115 if (!sym_has_value(sym))
1116 sym->def[S_DEF_USER].tri = no;
1117 }
1118 csym->flags |= SYMBOL_DEF_USER;
1119 /* clear VALID to get value calculated */
1120 csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1121}
1122
1123bool conf_set_all_new_symbols(enum conf_def_mode mode)
1124{
1125 struct symbol *sym, *csym;
1126 int i, cnt, pby, pty, ptm; /* pby: probability of bool = y
1127 * pty: probability of tristate = y
1128 * ptm: probability of tristate = m
1129 */
1130
1131 pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1132 * below, otherwise gcc whines about
1133 * -Wmaybe-uninitialized */
1134 if (mode == def_random) {
1135 int n, p[3];
1136 char *env = getenv("KCONFIG_PROBABILITY");
1137 n = 0;
1138 while( env && *env ) {
1139 char *endp;
1140 int tmp = strtol( env, &endp, 10 );
1141 if( tmp >= 0 && tmp <= 100 ) {
1142 p[n++] = tmp;
1143 } else {
1144 errno = ERANGE;
1145 perror( "KCONFIG_PROBABILITY" );
1146 exit( 1 );
1147 }
1148 env = (*endp == ':') ? endp+1 : endp;
1149 if( n >=3 ) {
1150 break;
1151 }
1152 }
1153 switch( n ) {
1154 case 1:
1155 pby = p[0]; ptm = pby/2; pty = pby-ptm;
1156 break;
1157 case 2:
1158 pty = p[0]; ptm = p[1]; pby = pty + ptm;
1159 break;
1160 case 3:
1161 pby = p[0]; pty = p[1]; ptm = p[2];
1162 break;
1163 }
1164
1165 if( pty+ptm > 100 ) {
1166 errno = ERANGE;
1167 perror( "KCONFIG_PROBABILITY" );
1168 exit( 1 );
1169 }
1170 }
1171 bool has_changed = false;
1172
1173 for_all_symbols(i, sym) {
1174 if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1175 continue;
1176 switch (sym_get_type(sym)) {
1177 case S_BOOLEAN:
1178 case S_TRISTATE:
1179 has_changed = true;
1180 switch (mode) {
1181 case def_yes:
1182 sym->def[S_DEF_USER].tri = yes;
1183 break;
1184 case def_mod:
1185 sym->def[S_DEF_USER].tri = mod;
1186 break;
1187 case def_no:
1188 if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1189 sym->def[S_DEF_USER].tri = yes;
1190 else
1191 sym->def[S_DEF_USER].tri = no;
1192 break;
1193 case def_random:
1194 sym->def[S_DEF_USER].tri = no;
1195 cnt = rand() % 100;
1196 if (sym->type == S_TRISTATE) {
1197 if (cnt < pty)
1198 sym->def[S_DEF_USER].tri = yes;
1199 else if (cnt < (pty+ptm))
1200 sym->def[S_DEF_USER].tri = mod;
1201 } else if (cnt < pby)
1202 sym->def[S_DEF_USER].tri = yes;
1203 break;
1204 default:
1205 continue;
1206 }
1207 if (!(sym_is_choice(sym) && mode == def_random))
1208 sym->flags |= SYMBOL_DEF_USER;
1209 break;
1210 default:
1211 break;
1212 }
1213
1214 }
1215
1216 sym_clear_all_valid();
1217
1218 /*
1219 * We have different type of choice blocks.
1220 * If curr.tri equals to mod then we can select several
1221 * choice symbols in one block.
1222 * In this case we do nothing.
1223 * If curr.tri equals yes then only one symbol can be
1224 * selected in a choice block and we set it to yes,
1225 * and the rest to no.
1226 */
1227 if (mode != def_random) {
1228 for_all_symbols(i, csym) {
1229 if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1230 sym_is_choice_value(csym))
1231 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1232 }
1233 }
1234
1235 for_all_symbols(i, csym) {
1236 if (sym_has_value(csym) || !sym_is_choice(csym))
1237 continue;
1238
1239 sym_calc_value(csym);
1240 if (mode == def_random)
1241 has_changed = randomize_choice_values(csym);
1242 else {
1243 set_all_choice_values(csym);
1244 has_changed = true;
1245 }
1246 }
1247
1248 return has_changed;
1249}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <ctype.h>
10#include <errno.h>
11#include <fcntl.h>
12#include <limits.h>
13#include <stdarg.h>
14#include <stdbool.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <string.h>
18#include <time.h>
19#include <unistd.h>
20
21#include <xalloc.h>
22#include "internal.h"
23#include "lkc.h"
24
25struct gstr autoconf_cmd;
26
27/* return true if 'path' exists, false otherwise */
28static bool is_present(const char *path)
29{
30 struct stat st;
31
32 return !stat(path, &st);
33}
34
35/* return true if 'path' exists and it is a directory, false otherwise */
36static bool is_dir(const char *path)
37{
38 struct stat st;
39
40 if (stat(path, &st))
41 return false;
42
43 return S_ISDIR(st.st_mode);
44}
45
46/* return true if the given two files are the same, false otherwise */
47static bool is_same(const char *file1, const char *file2)
48{
49 int fd1, fd2;
50 struct stat st1, st2;
51 void *map1, *map2;
52 bool ret = false;
53
54 fd1 = open(file1, O_RDONLY);
55 if (fd1 < 0)
56 return ret;
57
58 fd2 = open(file2, O_RDONLY);
59 if (fd2 < 0)
60 goto close1;
61
62 ret = fstat(fd1, &st1);
63 if (ret)
64 goto close2;
65 ret = fstat(fd2, &st2);
66 if (ret)
67 goto close2;
68
69 if (st1.st_size != st2.st_size)
70 goto close2;
71
72 map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
73 if (map1 == MAP_FAILED)
74 goto close2;
75
76 map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
77 if (map2 == MAP_FAILED)
78 goto close2;
79
80 if (bcmp(map1, map2, st1.st_size))
81 goto close2;
82
83 ret = true;
84close2:
85 close(fd2);
86close1:
87 close(fd1);
88
89 return ret;
90}
91
92/*
93 * Create the parent directory of the given path.
94 *
95 * For example, if 'include/config/auto.conf' is given, create 'include/config'.
96 */
97static int make_parent_dir(const char *path)
98{
99 char tmp[PATH_MAX + 1];
100 char *p;
101
102 strncpy(tmp, path, sizeof(tmp));
103 tmp[sizeof(tmp) - 1] = 0;
104
105 /* Remove the base name. Just return if nothing is left */
106 p = strrchr(tmp, '/');
107 if (!p)
108 return 0;
109 *(p + 1) = 0;
110
111 /* Just in case it is an absolute path */
112 p = tmp;
113 while (*p == '/')
114 p++;
115
116 while ((p = strchr(p, '/'))) {
117 *p = 0;
118
119 /* skip if the directory exists */
120 if (!is_dir(tmp) && mkdir(tmp, 0755))
121 return -1;
122
123 *p = '/';
124 while (*p == '/')
125 p++;
126 }
127
128 return 0;
129}
130
131static char depfile_path[PATH_MAX];
132static size_t depfile_prefix_len;
133
134/* touch depfile for symbol 'name' */
135static int conf_touch_dep(const char *name)
136{
137 int fd;
138
139 /* check overflow: prefix + name + '\0' must fit in buffer. */
140 if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
141 return -1;
142
143 strcpy(depfile_path + depfile_prefix_len, name);
144
145 fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
146 if (fd == -1)
147 return -1;
148 close(fd);
149
150 return 0;
151}
152
153static void conf_warning(const char *fmt, ...)
154 __attribute__ ((format (printf, 1, 2)));
155
156static void conf_message(const char *fmt, ...)
157 __attribute__ ((format (printf, 1, 2)));
158
159static const char *conf_filename;
160static int conf_lineno, conf_warnings;
161
162bool conf_errors(void)
163{
164 if (conf_warnings)
165 return getenv("KCONFIG_WERROR");
166 return false;
167}
168
169static void conf_warning(const char *fmt, ...)
170{
171 va_list ap;
172 va_start(ap, fmt);
173 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
174 vfprintf(stderr, fmt, ap);
175 fprintf(stderr, "\n");
176 va_end(ap);
177 conf_warnings++;
178}
179
180static void conf_default_message_callback(const char *s)
181{
182 printf("#\n# ");
183 printf("%s", s);
184 printf("\n#\n");
185}
186
187static void (*conf_message_callback)(const char *s) =
188 conf_default_message_callback;
189void conf_set_message_callback(void (*fn)(const char *s))
190{
191 conf_message_callback = fn;
192}
193
194static void conf_message(const char *fmt, ...)
195{
196 va_list ap;
197 char buf[4096];
198
199 if (!conf_message_callback)
200 return;
201
202 va_start(ap, fmt);
203
204 vsnprintf(buf, sizeof(buf), fmt, ap);
205 conf_message_callback(buf);
206 va_end(ap);
207}
208
209const char *conf_get_configname(void)
210{
211 char *name = getenv("KCONFIG_CONFIG");
212
213 return name ? name : ".config";
214}
215
216static const char *conf_get_autoconfig_name(void)
217{
218 char *name = getenv("KCONFIG_AUTOCONFIG");
219
220 return name ? name : "include/config/auto.conf";
221}
222
223static const char *conf_get_autoheader_name(void)
224{
225 char *name = getenv("KCONFIG_AUTOHEADER");
226
227 return name ? name : "include/generated/autoconf.h";
228}
229
230static const char *conf_get_rustccfg_name(void)
231{
232 char *name = getenv("KCONFIG_RUSTCCFG");
233
234 return name ? name : "include/generated/rustc_cfg";
235}
236
237static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
238{
239 char *p2;
240
241 switch (sym->type) {
242 case S_TRISTATE:
243 if (p[0] == 'm') {
244 sym->def[def].tri = mod;
245 sym->flags |= def_flags;
246 break;
247 }
248 /* fall through */
249 case S_BOOLEAN:
250 if (p[0] == 'y') {
251 sym->def[def].tri = yes;
252 sym->flags |= def_flags;
253 break;
254 }
255 if (p[0] == 'n') {
256 sym->def[def].tri = no;
257 sym->flags |= def_flags;
258 break;
259 }
260 if (def != S_DEF_AUTO)
261 conf_warning("symbol value '%s' invalid for %s",
262 p, sym->name);
263 return 1;
264 case S_STRING:
265 /* No escaping for S_DEF_AUTO (include/config/auto.conf) */
266 if (def != S_DEF_AUTO) {
267 if (*p++ != '"')
268 break;
269 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
270 if (*p2 == '"') {
271 *p2 = 0;
272 break;
273 }
274 memmove(p2, p2 + 1, strlen(p2));
275 }
276 if (!p2) {
277 conf_warning("invalid string found");
278 return 1;
279 }
280 }
281 /* fall through */
282 case S_INT:
283 case S_HEX:
284 if (sym_string_valid(sym, p)) {
285 sym->def[def].val = xstrdup(p);
286 sym->flags |= def_flags;
287 } else {
288 if (def != S_DEF_AUTO)
289 conf_warning("symbol value '%s' invalid for %s",
290 p, sym->name);
291 return 1;
292 }
293 break;
294 default:
295 ;
296 }
297 return 0;
298}
299
300/* like getline(), but the newline character is stripped away */
301static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
302{
303 ssize_t len;
304
305 len = getline(lineptr, n, stream);
306
307 if (len > 0 && (*lineptr)[len - 1] == '\n') {
308 len--;
309 (*lineptr)[len] = '\0';
310
311 if (len > 0 && (*lineptr)[len - 1] == '\r') {
312 len--;
313 (*lineptr)[len] = '\0';
314 }
315 }
316
317 return len;
318}
319
320int conf_read_simple(const char *name, int def)
321{
322 FILE *in = NULL;
323 char *line = NULL;
324 size_t line_asize = 0;
325 char *p, *val;
326 struct symbol *sym;
327 int def_flags;
328 const char *warn_unknown, *sym_name;
329
330 warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
331 if (name) {
332 in = zconf_fopen(name);
333 } else {
334 char *env;
335
336 name = conf_get_configname();
337 in = zconf_fopen(name);
338 if (in)
339 goto load;
340 conf_set_changed(true);
341
342 env = getenv("KCONFIG_DEFCONFIG_LIST");
343 if (!env)
344 return 1;
345
346 while (1) {
347 bool is_last;
348
349 while (isspace(*env))
350 env++;
351
352 if (!*env)
353 break;
354
355 p = env;
356 while (*p && !isspace(*p))
357 p++;
358
359 is_last = (*p == '\0');
360
361 *p = '\0';
362
363 name = env;
364
365 in = zconf_fopen(name);
366 if (in) {
367 conf_message("using defaults found in %s",
368 name);
369 goto load;
370 }
371
372 if (is_last)
373 break;
374
375 env = p + 1;
376 }
377 }
378 if (!in)
379 return 1;
380
381load:
382 conf_filename = name;
383 conf_lineno = 0;
384 conf_warnings = 0;
385
386 def_flags = SYMBOL_DEF << def;
387 for_all_symbols(sym) {
388 sym->flags &= ~(def_flags|SYMBOL_VALID);
389 switch (sym->type) {
390 case S_INT:
391 case S_HEX:
392 case S_STRING:
393 free(sym->def[def].val);
394 /* fall through */
395 default:
396 sym->def[def].val = NULL;
397 sym->def[def].tri = no;
398 }
399 }
400
401 expr_invalidate_all();
402
403 while (getline_stripped(&line, &line_asize, in) != -1) {
404 struct menu *choice;
405
406 conf_lineno++;
407
408 if (!line[0]) /* blank line */
409 continue;
410
411 if (line[0] == '#') {
412 if (line[1] != ' ')
413 continue;
414 p = line + 2;
415 if (memcmp(p, CONFIG_, strlen(CONFIG_)))
416 continue;
417 sym_name = p + strlen(CONFIG_);
418 p = strchr(sym_name, ' ');
419 if (!p)
420 continue;
421 *p++ = 0;
422 if (strcmp(p, "is not set"))
423 continue;
424
425 val = "n";
426 } else {
427 if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
428 conf_warning("unexpected data: %s", line);
429 continue;
430 }
431
432 sym_name = line + strlen(CONFIG_);
433 p = strchr(sym_name, '=');
434 if (!p) {
435 conf_warning("unexpected data: %s", line);
436 continue;
437 }
438 *p = 0;
439 val = p + 1;
440 }
441
442 sym = sym_find(sym_name);
443 if (!sym) {
444 if (def == S_DEF_AUTO) {
445 /*
446 * Reading from include/config/auto.conf.
447 * If CONFIG_FOO previously existed in auto.conf
448 * but it is missing now, include/config/FOO
449 * must be touched.
450 */
451 conf_touch_dep(sym_name);
452 } else {
453 if (warn_unknown)
454 conf_warning("unknown symbol: %s", sym_name);
455
456 conf_set_changed(true);
457 }
458 continue;
459 }
460
461 if (sym->flags & def_flags)
462 conf_warning("override: reassigning to symbol %s", sym->name);
463
464 if (conf_set_sym_val(sym, def, def_flags, val))
465 continue;
466
467 /*
468 * If this is a choice member, give it the highest priority.
469 * If conflicting CONFIG options are given from an input file,
470 * the last one wins.
471 */
472 choice = sym_get_choice_menu(sym);
473 if (choice)
474 list_move(&sym->choice_link, &choice->choice_members);
475 }
476 free(line);
477 fclose(in);
478
479 return 0;
480}
481
482int conf_read(const char *name)
483{
484 struct symbol *sym;
485
486 conf_set_changed(false);
487
488 if (conf_read_simple(name, S_DEF_USER)) {
489 sym_calc_value(modules_sym);
490 return 1;
491 }
492
493 sym_calc_value(modules_sym);
494
495 for_all_symbols(sym) {
496 sym_calc_value(sym);
497 if (sym_is_choice(sym))
498 continue;
499 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
500 /* check that calculated value agrees with saved value */
501 switch (sym->type) {
502 case S_BOOLEAN:
503 case S_TRISTATE:
504 if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
505 continue;
506 break;
507 default:
508 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
509 continue;
510 break;
511 }
512 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
513 /* no previous value and not saved */
514 continue;
515 conf_set_changed(true);
516 /* maybe print value in verbose mode... */
517 }
518
519 if (conf_warnings)
520 conf_set_changed(true);
521
522 return 0;
523}
524
525struct comment_style {
526 const char *decoration;
527 const char *prefix;
528 const char *postfix;
529};
530
531static const struct comment_style comment_style_pound = {
532 .decoration = "#",
533 .prefix = "#",
534 .postfix = "#",
535};
536
537static const struct comment_style comment_style_c = {
538 .decoration = " *",
539 .prefix = "/*",
540 .postfix = " */",
541};
542
543static void conf_write_heading(FILE *fp, const struct comment_style *cs)
544{
545 if (!cs)
546 return;
547
548 fprintf(fp, "%s\n", cs->prefix);
549
550 fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
551 cs->decoration);
552
553 fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
554
555 fprintf(fp, "%s\n", cs->postfix);
556}
557
558/* The returned pointer must be freed on the caller side */
559static char *escape_string_value(const char *in)
560{
561 const char *p;
562 char *out;
563 size_t len;
564
565 len = strlen(in) + strlen("\"\"") + 1;
566
567 p = in;
568 while (1) {
569 p += strcspn(p, "\"\\");
570
571 if (p[0] == '\0')
572 break;
573
574 len++;
575 p++;
576 }
577
578 out = xmalloc(len);
579 out[0] = '\0';
580
581 strcat(out, "\"");
582
583 p = in;
584 while (1) {
585 len = strcspn(p, "\"\\");
586 strncat(out, p, len);
587 p += len;
588
589 if (p[0] == '\0')
590 break;
591
592 strcat(out, "\\");
593 strncat(out, p++, 1);
594 }
595
596 strcat(out, "\"");
597
598 return out;
599}
600
601enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
602
603static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
604 bool escape_string)
605{
606 const char *val;
607 char *escaped = NULL;
608
609 if (sym->type == S_UNKNOWN)
610 return;
611
612 val = sym_get_string_value(sym);
613
614 if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
615 output_n != OUTPUT_N && *val == 'n') {
616 if (output_n == OUTPUT_N_AS_UNSET)
617 fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
618 return;
619 }
620
621 if (sym->type == S_STRING && escape_string) {
622 escaped = escape_string_value(val);
623 val = escaped;
624 }
625
626 fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
627
628 free(escaped);
629}
630
631static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
632{
633 __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
634}
635
636static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
637{
638 __print_symbol(fp, sym, OUTPUT_N_NONE, false);
639}
640
641void print_symbol_for_listconfig(struct symbol *sym)
642{
643 __print_symbol(stdout, sym, OUTPUT_N, true);
644}
645
646static void print_symbol_for_c(FILE *fp, struct symbol *sym)
647{
648 const char *val;
649 const char *sym_suffix = "";
650 const char *val_prefix = "";
651 char *escaped = NULL;
652
653 if (sym->type == S_UNKNOWN)
654 return;
655
656 val = sym_get_string_value(sym);
657
658 switch (sym->type) {
659 case S_BOOLEAN:
660 case S_TRISTATE:
661 switch (*val) {
662 case 'n':
663 return;
664 case 'm':
665 sym_suffix = "_MODULE";
666 /* fall through */
667 default:
668 val = "1";
669 }
670 break;
671 case S_HEX:
672 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
673 val_prefix = "0x";
674 break;
675 case S_STRING:
676 escaped = escape_string_value(val);
677 val = escaped;
678 default:
679 break;
680 }
681
682 fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
683 val_prefix, val);
684
685 free(escaped);
686}
687
688static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
689{
690 const char *val;
691 const char *val_prefix = "";
692 char *val_prefixed = NULL;
693 size_t val_prefixed_len;
694 char *escaped = NULL;
695
696 if (sym->type == S_UNKNOWN)
697 return;
698
699 val = sym_get_string_value(sym);
700
701 switch (sym->type) {
702 case S_BOOLEAN:
703 case S_TRISTATE:
704 /*
705 * We do not care about disabled ones, i.e. no need for
706 * what otherwise are "comments" in other printers.
707 */
708 if (*val == 'n')
709 return;
710
711 /*
712 * To have similar functionality to the C macro `IS_ENABLED()`
713 * we provide an empty `--cfg CONFIG_X` here in both `y`
714 * and `m` cases.
715 *
716 * Then, the common `fprintf()` below will also give us
717 * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
718 * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
719 */
720 fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
721 break;
722 case S_HEX:
723 if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
724 val_prefix = "0x";
725 break;
726 default:
727 break;
728 }
729
730 if (strlen(val_prefix) > 0) {
731 val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
732 val_prefixed = xmalloc(val_prefixed_len);
733 snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
734 val = val_prefixed;
735 }
736
737 /* All values get escaped: the `--cfg` option only takes strings */
738 escaped = escape_string_value(val);
739 val = escaped;
740
741 fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
742
743 free(escaped);
744 free(val_prefixed);
745}
746
747/*
748 * Write out a minimal config.
749 * All values that has default values are skipped as this is redundant.
750 */
751int conf_write_defconfig(const char *filename)
752{
753 struct symbol *sym;
754 struct menu *menu;
755 FILE *out;
756
757 out = fopen(filename, "w");
758 if (!out)
759 return 1;
760
761 sym_clear_all_valid();
762
763 menu_for_each_entry(menu) {
764 struct menu *choice;
765
766 sym = menu->sym;
767
768 if (!sym || sym_is_choice(sym))
769 continue;
770
771 sym_calc_value(sym);
772 if (!(sym->flags & SYMBOL_WRITE))
773 continue;
774 sym->flags &= ~SYMBOL_WRITE;
775 /* Skip unchangeable symbols */
776 if (!sym_is_changeable(sym))
777 continue;
778 /* Skip symbols that are equal to the default */
779 if (!strcmp(sym_get_string_value(sym), sym_get_string_default(sym)))
780 continue;
781
782 /* Skip choice values that are equal to the default */
783 choice = sym_get_choice_menu(sym);
784 if (choice) {
785 struct symbol *ds;
786
787 ds = sym_choice_default(choice);
788 if (sym == ds && sym_get_tristate_value(sym) == yes)
789 continue;
790 }
791 print_symbol_for_dotconfig(out, sym);
792 }
793 fclose(out);
794 return 0;
795}
796
797int conf_write(const char *name)
798{
799 FILE *out;
800 struct symbol *sym;
801 struct menu *menu;
802 const char *str;
803 char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
804 char *env;
805 bool need_newline = false;
806
807 if (!name)
808 name = conf_get_configname();
809
810 if (!*name) {
811 fprintf(stderr, "config name is empty\n");
812 return -1;
813 }
814
815 if (is_dir(name)) {
816 fprintf(stderr, "%s: Is a directory\n", name);
817 return -1;
818 }
819
820 if (make_parent_dir(name))
821 return -1;
822
823 env = getenv("KCONFIG_OVERWRITECONFIG");
824 if (env && *env) {
825 *tmpname = 0;
826 out = fopen(name, "w");
827 } else {
828 snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
829 name, (int)getpid());
830 out = fopen(tmpname, "w");
831 }
832 if (!out)
833 return 1;
834
835 conf_write_heading(out, &comment_style_pound);
836
837 if (!conf_get_changed())
838 sym_clear_all_valid();
839
840 menu = rootmenu.list;
841 while (menu) {
842 sym = menu->sym;
843 if (!sym) {
844 if (!menu_is_visible(menu))
845 goto next;
846 str = menu_get_prompt(menu);
847 fprintf(out, "\n"
848 "#\n"
849 "# %s\n"
850 "#\n", str);
851 need_newline = false;
852 } else if (!sym_is_choice(sym) &&
853 !(sym->flags & SYMBOL_WRITTEN)) {
854 sym_calc_value(sym);
855 if (!(sym->flags & SYMBOL_WRITE))
856 goto next;
857 if (need_newline) {
858 fprintf(out, "\n");
859 need_newline = false;
860 }
861 sym->flags |= SYMBOL_WRITTEN;
862 print_symbol_for_dotconfig(out, sym);
863 }
864
865next:
866 if (menu->list) {
867 menu = menu->list;
868 continue;
869 }
870
871end_check:
872 if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
873 menu->prompt->type == P_MENU) {
874 fprintf(out, "# end of %s\n", menu_get_prompt(menu));
875 need_newline = true;
876 }
877
878 if (menu->next) {
879 menu = menu->next;
880 } else {
881 menu = menu->parent;
882 if (menu)
883 goto end_check;
884 }
885 }
886 fclose(out);
887
888 for_all_symbols(sym)
889 sym->flags &= ~SYMBOL_WRITTEN;
890
891 if (*tmpname) {
892 if (is_same(name, tmpname)) {
893 conf_message("No change to %s", name);
894 unlink(tmpname);
895 conf_set_changed(false);
896 return 0;
897 }
898
899 snprintf(oldname, sizeof(oldname), "%s.old", name);
900 rename(name, oldname);
901 if (rename(tmpname, name))
902 return 1;
903 }
904
905 conf_message("configuration written to %s", name);
906
907 conf_set_changed(false);
908
909 return 0;
910}
911
912/* write a dependency file as used by kbuild to track dependencies */
913static int conf_write_autoconf_cmd(const char *autoconf_name)
914{
915 char name[PATH_MAX], tmp[PATH_MAX];
916 FILE *out;
917 int ret;
918
919 ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
920 if (ret >= sizeof(name)) /* check truncation */
921 return -1;
922
923 if (make_parent_dir(name))
924 return -1;
925
926 ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
927 if (ret >= sizeof(tmp)) /* check truncation */
928 return -1;
929
930 out = fopen(tmp, "w");
931 if (!out) {
932 perror("fopen");
933 return -1;
934 }
935
936 fprintf(out, "autoconfig := %s\n", autoconf_name);
937
938 fputs(str_get(&autoconf_cmd), out);
939
940 fflush(out);
941 ret = ferror(out); /* error check for all fprintf() calls */
942 fclose(out);
943 if (ret)
944 return -1;
945
946 if (rename(tmp, name)) {
947 perror("rename");
948 return -1;
949 }
950
951 return 0;
952}
953
954static int conf_touch_deps(void)
955{
956 const char *name, *tmp;
957 struct symbol *sym;
958 int res;
959
960 name = conf_get_autoconfig_name();
961 tmp = strrchr(name, '/');
962 depfile_prefix_len = tmp ? tmp - name + 1 : 0;
963 if (depfile_prefix_len + 1 > sizeof(depfile_path))
964 return -1;
965
966 strncpy(depfile_path, name, depfile_prefix_len);
967 depfile_path[depfile_prefix_len] = 0;
968
969 conf_read_simple(name, S_DEF_AUTO);
970 sym_calc_value(modules_sym);
971
972 for_all_symbols(sym) {
973 sym_calc_value(sym);
974 if (sym_is_choice(sym))
975 continue;
976 if (sym->flags & SYMBOL_WRITE) {
977 if (sym->flags & SYMBOL_DEF_AUTO) {
978 /*
979 * symbol has old and new value,
980 * so compare them...
981 */
982 switch (sym->type) {
983 case S_BOOLEAN:
984 case S_TRISTATE:
985 if (sym_get_tristate_value(sym) ==
986 sym->def[S_DEF_AUTO].tri)
987 continue;
988 break;
989 case S_STRING:
990 case S_HEX:
991 case S_INT:
992 if (!strcmp(sym_get_string_value(sym),
993 sym->def[S_DEF_AUTO].val))
994 continue;
995 break;
996 default:
997 break;
998 }
999 } else {
1000 /*
1001 * If there is no old value, only 'no' (unset)
1002 * is allowed as new value.
1003 */
1004 switch (sym->type) {
1005 case S_BOOLEAN:
1006 case S_TRISTATE:
1007 if (sym_get_tristate_value(sym) == no)
1008 continue;
1009 break;
1010 default:
1011 break;
1012 }
1013 }
1014 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
1015 /* There is neither an old nor a new value. */
1016 continue;
1017 /* else
1018 * There is an old value, but no new value ('no' (unset)
1019 * isn't saved in auto.conf, so the old value is always
1020 * different from 'no').
1021 */
1022
1023 res = conf_touch_dep(sym->name);
1024 if (res)
1025 return res;
1026 }
1027
1028 return 0;
1029}
1030
1031static int __conf_write_autoconf(const char *filename,
1032 void (*print_symbol)(FILE *, struct symbol *),
1033 const struct comment_style *comment_style)
1034{
1035 char tmp[PATH_MAX];
1036 FILE *file;
1037 struct symbol *sym;
1038 int ret;
1039
1040 if (make_parent_dir(filename))
1041 return -1;
1042
1043 ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename);
1044 if (ret >= sizeof(tmp)) /* check truncation */
1045 return -1;
1046
1047 file = fopen(tmp, "w");
1048 if (!file) {
1049 perror("fopen");
1050 return -1;
1051 }
1052
1053 conf_write_heading(file, comment_style);
1054
1055 for_all_symbols(sym)
1056 if ((sym->flags & SYMBOL_WRITE) && sym->name)
1057 print_symbol(file, sym);
1058
1059 fflush(file);
1060 /* check possible errors in conf_write_heading() and print_symbol() */
1061 ret = ferror(file);
1062 fclose(file);
1063 if (ret)
1064 return -1;
1065
1066 if (rename(tmp, filename)) {
1067 perror("rename");
1068 return -1;
1069 }
1070
1071 return 0;
1072}
1073
1074int conf_write_autoconf(int overwrite)
1075{
1076 struct symbol *sym;
1077 const char *autoconf_name = conf_get_autoconfig_name();
1078 int ret;
1079
1080 if (!overwrite && is_present(autoconf_name))
1081 return 0;
1082
1083 ret = conf_write_autoconf_cmd(autoconf_name);
1084 if (ret)
1085 return -1;
1086
1087 if (conf_touch_deps())
1088 return 1;
1089
1090 for_all_symbols(sym)
1091 sym_calc_value(sym);
1092
1093 ret = __conf_write_autoconf(conf_get_autoheader_name(),
1094 print_symbol_for_c,
1095 &comment_style_c);
1096 if (ret)
1097 return ret;
1098
1099 ret = __conf_write_autoconf(conf_get_rustccfg_name(),
1100 print_symbol_for_rustccfg,
1101 NULL);
1102 if (ret)
1103 return ret;
1104
1105 /*
1106 * Create include/config/auto.conf. This must be the last step because
1107 * Kbuild has a dependency on auto.conf and this marks the successful
1108 * completion of the previous steps.
1109 */
1110 ret = __conf_write_autoconf(conf_get_autoconfig_name(),
1111 print_symbol_for_autoconf,
1112 &comment_style_pound);
1113 if (ret)
1114 return ret;
1115
1116 return 0;
1117}
1118
1119static bool conf_changed;
1120static void (*conf_changed_callback)(bool);
1121
1122void conf_set_changed(bool val)
1123{
1124 if (conf_changed_callback && conf_changed != val)
1125 conf_changed_callback(val);
1126
1127 conf_changed = val;
1128}
1129
1130bool conf_get_changed(void)
1131{
1132 return conf_changed;
1133}
1134
1135void conf_set_changed_callback(void (*fn)(bool))
1136{
1137 conf_changed_callback = fn;
1138}