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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4  */
5 
6 #include <sys/mman.h>
7 #include <sys/stat.h>
8 #include <ctype.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <limits.h>
12 #include <stdarg.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <time.h>
17 #include <unistd.h>
18 
19 #include "lkc.h"
20 
21 /* return true if 'path' exists, false otherwise */
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, *tmp;
991 	struct symbol *sym;
992 	int res, i;
993 
994 	name = conf_get_autoconfig_name();
995 	tmp = strrchr(name, '/');
996 	depfile_prefix_len = tmp ? tmp - name + 1 : 0;
997 	if (depfile_prefix_len + 1 > sizeof(depfile_path))
998 		return -1;
999 
1000 	strncpy(depfile_path, name, depfile_prefix_len);
1001 	depfile_path[depfile_prefix_len] = 0;
1002 
1003 	conf_read_simple(name, S_DEF_AUTO);
1004 	sym_calc_value(modules_sym);
1005 
1006 	for_all_symbols(i, sym) {
1007 		sym_calc_value(sym);
1008 		if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
1009 			continue;
1010 		if (sym->flags & SYMBOL_WRITE) {
1011 			if (sym->flags & SYMBOL_DEF_AUTO) {
1012 				/*
1013 				 * symbol has old and new value,
1014 				 * so compare them...
1015 				 */
1016 				switch (sym->type) {
1017 				case S_BOOLEAN:
1018 				case S_TRISTATE:
1019 					if (sym_get_tristate_value(sym) ==
1020 					    sym->def[S_DEF_AUTO].tri)
1021 						continue;
1022 					break;
1023 				case S_STRING:
1024 				case S_HEX:
1025 				case S_INT:
1026 					if (!strcmp(sym_get_string_value(sym),
1027 						    sym->def[S_DEF_AUTO].val))
1028 						continue;
1029 					break;
1030 				default:
1031 					break;
1032 				}
1033 			} else {
1034 				/*
1035 				 * If there is no old value, only 'no' (unset)
1036 				 * is allowed as new value.
1037 				 */
1038 				switch (sym->type) {
1039 				case S_BOOLEAN:
1040 				case S_TRISTATE:
1041 					if (sym_get_tristate_value(sym) == no)
1042 						continue;
1043 					break;
1044 				default:
1045 					break;
1046 				}
1047 			}
1048 		} else if (!(sym->flags & SYMBOL_DEF_AUTO))
1049 			/* There is neither an old nor a new value. */
1050 			continue;
1051 		/* else
1052 		 *	There is an old value, but no new value ('no' (unset)
1053 		 *	isn't saved in auto.conf, so the old value is always
1054 		 *	different from 'no').
1055 		 */
1056 
1057 		res = conf_touch_dep(sym->name);
1058 		if (res)
1059 			return res;
1060 	}
1061 
1062 	return 0;
1063 }
1064 
conf_write_autoconf(int overwrite)1065 int conf_write_autoconf(int overwrite)
1066 {
1067 	struct symbol *sym;
1068 	const char *name;
1069 	const char *autoconf_name = conf_get_autoconfig_name();
1070 	FILE *out, *tristate, *out_h;
1071 	int i;
1072 
1073 	if (!overwrite && is_present(autoconf_name))
1074 		return 0;
1075 
1076 	conf_write_dep("include/config/auto.conf.cmd");
1077 
1078 	if (conf_touch_deps())
1079 		return 1;
1080 
1081 	out = fopen(".tmpconfig", "w");
1082 	if (!out)
1083 		return 1;
1084 
1085 	tristate = fopen(".tmpconfig_tristate", "w");
1086 	if (!tristate) {
1087 		fclose(out);
1088 		return 1;
1089 	}
1090 
1091 	out_h = fopen(".tmpconfig.h", "w");
1092 	if (!out_h) {
1093 		fclose(out);
1094 		fclose(tristate);
1095 		return 1;
1096 	}
1097 
1098 	conf_write_heading(out, &kconfig_printer_cb, NULL);
1099 
1100 	conf_write_heading(tristate, &tristate_printer_cb, NULL);
1101 
1102 	conf_write_heading(out_h, &header_printer_cb, NULL);
1103 
1104 	for_all_symbols(i, sym) {
1105 		sym_calc_value(sym);
1106 		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
1107 			continue;
1108 
1109 		/* write symbol to auto.conf, tristate and header files */
1110 		conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
1111 
1112 		conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
1113 
1114 		conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
1115 	}
1116 	fclose(out);
1117 	fclose(tristate);
1118 	fclose(out_h);
1119 
1120 	name = getenv("KCONFIG_AUTOHEADER");
1121 	if (!name)
1122 		name = "include/generated/autoconf.h";
1123 	if (make_parent_dir(name))
1124 		return 1;
1125 	if (rename(".tmpconfig.h", name))
1126 		return 1;
1127 
1128 	name = getenv("KCONFIG_TRISTATE");
1129 	if (!name)
1130 		name = "include/config/tristate.conf";
1131 	if (make_parent_dir(name))
1132 		return 1;
1133 	if (rename(".tmpconfig_tristate", name))
1134 		return 1;
1135 
1136 	if (make_parent_dir(autoconf_name))
1137 		return 1;
1138 	/*
1139 	 * This must be the last step, kbuild has a dependency on auto.conf
1140 	 * and this marks the successful completion of the previous steps.
1141 	 */
1142 	if (rename(".tmpconfig", autoconf_name))
1143 		return 1;
1144 
1145 	return 0;
1146 }
1147 
1148 static int sym_change_count;
1149 static void (*conf_changed_callback)(void);
1150 
sym_set_change_count(int count)1151 void sym_set_change_count(int count)
1152 {
1153 	int _sym_change_count = sym_change_count;
1154 	sym_change_count = count;
1155 	if (conf_changed_callback &&
1156 	    (bool)_sym_change_count != (bool)count)
1157 		conf_changed_callback();
1158 }
1159 
sym_add_change_count(int count)1160 void sym_add_change_count(int count)
1161 {
1162 	sym_set_change_count(count + sym_change_count);
1163 }
1164 
conf_get_changed(void)1165 bool conf_get_changed(void)
1166 {
1167 	return sym_change_count;
1168 }
1169 
conf_set_changed_callback(void (* fn)(void))1170 void conf_set_changed_callback(void (*fn)(void))
1171 {
1172 	conf_changed_callback = fn;
1173 }
1174 
randomize_choice_values(struct symbol * csym)1175 static bool randomize_choice_values(struct symbol *csym)
1176 {
1177 	struct property *prop;
1178 	struct symbol *sym;
1179 	struct expr *e;
1180 	int cnt, def;
1181 
1182 	/*
1183 	 * If choice is mod then we may have more items selected
1184 	 * and if no then no-one.
1185 	 * In both cases stop.
1186 	 */
1187 	if (csym->curr.tri != yes)
1188 		return false;
1189 
1190 	prop = sym_get_choice_prop(csym);
1191 
1192 	/* count entries in choice block */
1193 	cnt = 0;
1194 	expr_list_for_each_sym(prop->expr, e, sym)
1195 		cnt++;
1196 
1197 	/*
1198 	 * find a random value and set it to yes,
1199 	 * set the rest to no so we have only one set
1200 	 */
1201 	def = (rand() % cnt);
1202 
1203 	cnt = 0;
1204 	expr_list_for_each_sym(prop->expr, e, sym) {
1205 		if (def == cnt++) {
1206 			sym->def[S_DEF_USER].tri = yes;
1207 			csym->def[S_DEF_USER].val = sym;
1208 		}
1209 		else {
1210 			sym->def[S_DEF_USER].tri = no;
1211 		}
1212 		sym->flags |= SYMBOL_DEF_USER;
1213 		/* clear VALID to get value calculated */
1214 		sym->flags &= ~SYMBOL_VALID;
1215 	}
1216 	csym->flags |= SYMBOL_DEF_USER;
1217 	/* clear VALID to get value calculated */
1218 	csym->flags &= ~(SYMBOL_VALID);
1219 
1220 	return true;
1221 }
1222 
set_all_choice_values(struct symbol * csym)1223 void set_all_choice_values(struct symbol *csym)
1224 {
1225 	struct property *prop;
1226 	struct symbol *sym;
1227 	struct expr *e;
1228 
1229 	prop = sym_get_choice_prop(csym);
1230 
1231 	/*
1232 	 * Set all non-assinged choice values to no
1233 	 */
1234 	expr_list_for_each_sym(prop->expr, e, sym) {
1235 		if (!sym_has_value(sym))
1236 			sym->def[S_DEF_USER].tri = no;
1237 	}
1238 	csym->flags |= SYMBOL_DEF_USER;
1239 	/* clear VALID to get value calculated */
1240 	csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
1241 }
1242 
conf_set_all_new_symbols(enum conf_def_mode mode)1243 bool conf_set_all_new_symbols(enum conf_def_mode mode)
1244 {
1245 	struct symbol *sym, *csym;
1246 	int i, cnt, pby, pty, ptm;	/* pby: probability of bool     = y
1247 					 * pty: probability of tristate = y
1248 					 * ptm: probability of tristate = m
1249 					 */
1250 
1251 	pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
1252 				   * below, otherwise gcc whines about
1253 				   * -Wmaybe-uninitialized */
1254 	if (mode == def_random) {
1255 		int n, p[3];
1256 		char *env = getenv("KCONFIG_PROBABILITY");
1257 		n = 0;
1258 		while( env && *env ) {
1259 			char *endp;
1260 			int tmp = strtol( env, &endp, 10 );
1261 			if( tmp >= 0 && tmp <= 100 ) {
1262 				p[n++] = tmp;
1263 			} else {
1264 				errno = ERANGE;
1265 				perror( "KCONFIG_PROBABILITY" );
1266 				exit( 1 );
1267 			}
1268 			env = (*endp == ':') ? endp+1 : endp;
1269 			if( n >=3 ) {
1270 				break;
1271 			}
1272 		}
1273 		switch( n ) {
1274 		case 1:
1275 			pby = p[0]; ptm = pby/2; pty = pby-ptm;
1276 			break;
1277 		case 2:
1278 			pty = p[0]; ptm = p[1]; pby = pty + ptm;
1279 			break;
1280 		case 3:
1281 			pby = p[0]; pty = p[1]; ptm = p[2];
1282 			break;
1283 		}
1284 
1285 		if( pty+ptm > 100 ) {
1286 			errno = ERANGE;
1287 			perror( "KCONFIG_PROBABILITY" );
1288 			exit( 1 );
1289 		}
1290 	}
1291 	bool has_changed = false;
1292 
1293 	for_all_symbols(i, sym) {
1294 		if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
1295 			continue;
1296 		switch (sym_get_type(sym)) {
1297 		case S_BOOLEAN:
1298 		case S_TRISTATE:
1299 			has_changed = true;
1300 			switch (mode) {
1301 			case def_yes:
1302 				sym->def[S_DEF_USER].tri = yes;
1303 				break;
1304 			case def_mod:
1305 				sym->def[S_DEF_USER].tri = mod;
1306 				break;
1307 			case def_no:
1308 				if (sym->flags & SYMBOL_ALLNOCONFIG_Y)
1309 					sym->def[S_DEF_USER].tri = yes;
1310 				else
1311 					sym->def[S_DEF_USER].tri = no;
1312 				break;
1313 			case def_random:
1314 				sym->def[S_DEF_USER].tri = no;
1315 				cnt = rand() % 100;
1316 				if (sym->type == S_TRISTATE) {
1317 					if (cnt < pty)
1318 						sym->def[S_DEF_USER].tri = yes;
1319 					else if (cnt < (pty+ptm))
1320 						sym->def[S_DEF_USER].tri = mod;
1321 				} else if (cnt < pby)
1322 					sym->def[S_DEF_USER].tri = yes;
1323 				break;
1324 			default:
1325 				continue;
1326 			}
1327 			if (!(sym_is_choice(sym) && mode == def_random))
1328 				sym->flags |= SYMBOL_DEF_USER;
1329 			break;
1330 		default:
1331 			break;
1332 		}
1333 
1334 	}
1335 
1336 	sym_clear_all_valid();
1337 
1338 	/*
1339 	 * We have different type of choice blocks.
1340 	 * If curr.tri equals to mod then we can select several
1341 	 * choice symbols in one block.
1342 	 * In this case we do nothing.
1343 	 * If curr.tri equals yes then only one symbol can be
1344 	 * selected in a choice block and we set it to yes,
1345 	 * and the rest to no.
1346 	 */
1347 	if (mode != def_random) {
1348 		for_all_symbols(i, csym) {
1349 			if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
1350 			    sym_is_choice_value(csym))
1351 				csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
1352 		}
1353 	}
1354 
1355 	for_all_symbols(i, csym) {
1356 		if (sym_has_value(csym) || !sym_is_choice(csym))
1357 			continue;
1358 
1359 		sym_calc_value(csym);
1360 		if (mode == def_random)
1361 			has_changed |= randomize_choice_values(csym);
1362 		else {
1363 			set_all_choice_values(csym);
1364 			has_changed = true;
1365 		}
1366 	}
1367 
1368 	return has_changed;
1369 }
1370