confdata.c 21.8 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <sys/stat.h>
#include <ctype.h>
8
#include <errno.h>
9
#include <fcntl.h>
L
Linus Torvalds 已提交
10 11 12 13 14 15 16 17 18
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

19 20 21 22 23 24
static void conf_warning(const char *fmt, ...)
	__attribute__ ((format (printf, 1, 2)));

static const char *conf_filename;
static int conf_lineno, conf_warnings, conf_unsaved;

L
Linus Torvalds 已提交
25 26
const char conf_defname[] = "arch/$ARCH/defconfig";

27 28 29 30 31 32 33 34 35 36 37
static void conf_warning(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, "\n");
	va_end(ap);
	conf_warnings++;
}

R
Roman Zippel 已提交
38 39 40 41 42 43 44
const char *conf_get_configname(void)
{
	char *name = getenv("KCONFIG_CONFIG");

	return name ? name : ".config";
}

45 46 47 48 49 50 51
const char *conf_get_autoconfig_name(void)
{
	char *name = getenv("KCONFIG_AUTOCONFIG");

	return name ? name : "include/config/auto.conf";
}

J
J.A. Magallon 已提交
52
static char *conf_expand_value(const char *in)
L
Linus Torvalds 已提交
53 54
{
	struct symbol *sym;
J
J.A. Magallon 已提交
55
	const char *src;
L
Linus Torvalds 已提交
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
	static char res_value[SYMBOL_MAXLENGTH];
	char *dst, name[SYMBOL_MAXLENGTH];

	res_value[0] = 0;
	dst = name;
	while ((src = strchr(in, '$'))) {
		strncat(res_value, in, src - in);
		src++;
		dst = name;
		while (isalnum(*src) || *src == '_')
			*dst++ = *src++;
		*dst = 0;
		sym = sym_lookup(name, 0);
		sym_calc_value(sym);
		strcat(res_value, sym_get_string_value(sym));
		in = src;
	}
	strcat(res_value, in);

	return res_value;
}

char *conf_get_default_confname(void)
{
	struct stat buf;
	static char fullname[PATH_MAX+1];
	char *env, *name;

	name = conf_expand_value(conf_defname);
	env = getenv(SRCTREE);
	if (env) {
		sprintf(fullname, "%s/%s", env, name);
		if (!stat(fullname, &buf))
			return fullname;
	}
	return name;
}

94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155
static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
{
	char *p2;

	switch (sym->type) {
	case S_TRISTATE:
		if (p[0] == 'm') {
			sym->def[def].tri = mod;
			sym->flags |= def_flags;
			break;
		}
	case S_BOOLEAN:
		if (p[0] == 'y') {
			sym->def[def].tri = yes;
			sym->flags |= def_flags;
			break;
		}
		if (p[0] == 'n') {
			sym->def[def].tri = no;
			sym->flags |= def_flags;
			break;
		}
		conf_warning("symbol value '%s' invalid for %s", p, sym->name);
		break;
	case S_OTHER:
		if (*p != '"') {
			for (p2 = p; *p2 && !isspace(*p2); p2++)
				;
			sym->type = S_STRING;
			goto done;
		}
	case S_STRING:
		if (*p++ != '"')
			break;
		for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
			if (*p2 == '"') {
				*p2 = 0;
				break;
			}
			memmove(p2, p2 + 1, strlen(p2));
		}
		if (!p2) {
			conf_warning("invalid string found");
			return 1;
		}
	case S_INT:
	case S_HEX:
	done:
		if (sym_string_valid(sym, p)) {
			sym->def[def].val = strdup(p);
			sym->flags |= def_flags;
		} else {
			conf_warning("symbol value '%s' invalid for %s", p, sym->name);
			return 1;
		}
		break;
	default:
		;
	}
	return 0;
}

156
int conf_read_simple(const char *name, int def)
L
Linus Torvalds 已提交
157 158 159 160 161
{
	FILE *in = NULL;
	char line[1024];
	char *p, *p2;
	struct symbol *sym;
162
	int i, def_flags;
L
Linus Torvalds 已提交
163 164 165 166

	if (name) {
		in = zconf_fopen(name);
	} else {
167 168
		struct property *prop;

R
Roman Zippel 已提交
169
		name = conf_get_configname();
170 171 172
		in = zconf_fopen(name);
		if (in)
			goto load;
173
		sym_add_change_count(1);
174 175 176
		if (!sym_defconfig_list) {
			if (modules_sym)
				sym_calc_value(modules_sym);
177
			return 1;
178
		}
179 180 181 182 183 184

		for_all_defaults(sym_defconfig_list, prop) {
			if (expr_calc_value(prop->visible.expr) == no ||
			    prop->expr->type != E_SYMBOL)
				continue;
			name = conf_expand_value(prop->expr->left.sym->name);
L
Linus Torvalds 已提交
185 186
			in = zconf_fopen(name);
			if (in) {
187
				printf(_("#\n"
188 189 190
					 "# using defaults found in %s\n"
					 "#\n"), name);
				goto load;
L
Linus Torvalds 已提交
191 192 193 194 195 196
			}
		}
	}
	if (!in)
		return 1;

197
load:
198 199 200 201 202
	conf_filename = name;
	conf_lineno = 0;
	conf_warnings = 0;
	conf_unsaved = 0;

203
	def_flags = SYMBOL_DEF << def;
L
Linus Torvalds 已提交
204
	for_all_symbols(i, sym) {
205 206
		sym->flags |= SYMBOL_CHANGED;
		sym->flags &= ~(def_flags|SYMBOL_VALID);
207
		if (sym_is_choice(sym))
208
			sym->flags |= def_flags;
L
Linus Torvalds 已提交
209 210 211 212
		switch (sym->type) {
		case S_INT:
		case S_HEX:
		case S_STRING:
213 214
			if (sym->def[def].val)
				free(sym->def[def].val);
L
Linus Torvalds 已提交
215
		default:
216 217
			sym->def[def].val = NULL;
			sym->def[def].tri = no;
L
Linus Torvalds 已提交
218 219 220 221
		}
	}

	while (fgets(line, sizeof(line), in)) {
222
		conf_lineno++;
L
Linus Torvalds 已提交
223 224 225 226 227 228 229 230 231 232 233
		sym = NULL;
		switch (line[0]) {
		case '#':
			if (memcmp(line + 2, "CONFIG_", 7))
				continue;
			p = strchr(line + 9, ' ');
			if (!p)
				continue;
			*p++ = 0;
			if (strncmp(p, "is not set", 10))
				continue;
234 235
			if (def == S_DEF_USER) {
				sym = sym_find(line + 9);
236 237
				if (!sym) {
					sym_add_change_count(1);
238
					break;
239
				}
240 241 242 243 244 245
			} else {
				sym = sym_lookup(line + 9, 0);
				if (sym->type == S_UNKNOWN)
					sym->type = S_BOOLEAN;
			}
			if (sym->flags & def_flags) {
246
				conf_warning("override: reassigning to symbol %s", sym->name);
L
Linus Torvalds 已提交
247 248 249 250
			}
			switch (sym->type) {
			case S_BOOLEAN:
			case S_TRISTATE:
251 252
				sym->def[def].tri = no;
				sym->flags |= def_flags;
L
Linus Torvalds 已提交
253 254 255 256 257 258
				break;
			default:
				;
			}
			break;
		case 'C':
259 260
			if (memcmp(line, "CONFIG_", 7)) {
				conf_warning("unexpected data");
L
Linus Torvalds 已提交
261
				continue;
262
			}
L
Linus Torvalds 已提交
263 264 265 266 267
			p = strchr(line + 7, '=');
			if (!p)
				continue;
			*p++ = 0;
			p2 = strchr(p, '\n');
268 269 270 271 272
			if (p2) {
				*p2-- = 0;
				if (*p2 == '\r')
					*p2 = 0;
			}
273 274
			if (def == S_DEF_USER) {
				sym = sym_find(line + 7);
275 276
				if (!sym) {
					sym_add_change_count(1);
277
					break;
278
				}
279 280 281 282 283 284
			} else {
				sym = sym_lookup(line + 7, 0);
				if (sym->type == S_UNKNOWN)
					sym->type = S_OTHER;
			}
			if (sym->flags & def_flags) {
285
				conf_warning("override: reassigning to symbol %s", sym->name);
L
Linus Torvalds 已提交
286
			}
287 288
			if (conf_set_sym_val(sym, def, def_flags, p))
				continue;
L
Linus Torvalds 已提交
289
			break;
290
		case '\r':
L
Linus Torvalds 已提交
291 292 293
		case '\n':
			break;
		default:
294
			conf_warning("unexpected data");
L
Linus Torvalds 已提交
295 296 297 298
			continue;
		}
		if (sym && sym_is_choice_value(sym)) {
			struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
299
			switch (sym->def[def].tri) {
L
Linus Torvalds 已提交
300 301 302
			case no:
				break;
			case mod:
303
				if (cs->def[def].tri == yes) {
304
					conf_warning("%s creates inconsistent choice state", sym->name);
305
					cs->flags &= ~def_flags;
306
				}
L
Linus Torvalds 已提交
307 308
				break;
			case yes:
309 310 311
				if (cs->def[def].tri != no)
					conf_warning("override: %s changes choice state", sym->name);
				cs->def[def].val = sym;
L
Linus Torvalds 已提交
312 313
				break;
			}
314
			cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
L
Linus Torvalds 已提交
315 316 317 318 319 320
		}
	}
	fclose(in);

	if (modules_sym)
		sym_calc_value(modules_sym);
321 322 323 324 325
	return 0;
}

int conf_read(const char *name)
{
326
	struct symbol *sym, *choice_sym;
327 328
	struct property *prop;
	struct expr *e;
329
	int i, flags;
330

331
	sym_set_change_count(0);
332

333
	if (conf_read_simple(name, S_DEF_USER))
334 335
		return 1;

L
Linus Torvalds 已提交
336 337
	for_all_symbols(i, sym) {
		sym_calc_value(sym);
338 339 340 341 342 343 344
		if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
			goto sym_ok;
		if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
			/* check that calculated value agrees with saved value */
			switch (sym->type) {
			case S_BOOLEAN:
			case S_TRISTATE:
345
				if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
346 347 348 349
					break;
				if (!sym_is_choice(sym))
					goto sym_ok;
			default:
350
				if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
351 352 353 354 355 356 357 358 359
					goto sym_ok;
				break;
			}
		} else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
			/* no previous value and not saved */
			goto sym_ok;
		conf_unsaved++;
		/* maybe print value in verbose mode... */
	sym_ok:
360 361 362 363 364 365 366
		if (!sym_is_choice(sym))
			continue;
		/* The choice symbol only has a set value (and thus is not new)
		 * if all its visible childs have values.
		 */
		prop = sym_get_choice_prop(sym);
		flags = sym->flags;
367 368 369
		expr_list_for_each_sym(prop->expr, e, choice_sym)
			if (choice_sym->visible != no)
				flags &= choice_sym->flags;
370 371 372 373
		sym->flags &= flags | ~SYMBOL_DEF_USER;
	}

	for_all_symbols(i, sym) {
L
Linus Torvalds 已提交
374
		if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
375 376 377 378 379 380
			/* Reset values of generates values, so they'll appear
			 * as new, if they should become visible, but that
			 * doesn't quite work if the Kconfig and the saved
			 * configuration disagree.
			 */
			if (sym->visible == no && !conf_unsaved)
381
				sym->flags &= ~SYMBOL_DEF_USER;
L
Linus Torvalds 已提交
382 383 384 385
			switch (sym->type) {
			case S_STRING:
			case S_INT:
			case S_HEX:
386 387 388 389 390 391
				/* Reset a string value if it's out of range */
				if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
					break;
				sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
				conf_unsaved++;
				break;
L
Linus Torvalds 已提交
392 393 394 395 396 397
			default:
				break;
			}
		}
	}

398
	sym_add_change_count(conf_warnings || conf_unsaved);
L
Linus Torvalds 已提交
399 400 401 402

	return 0;
}

403 404 405 406 407 408 409 410 411 412 413 414 415
/* Write a S_STRING */
static void conf_write_string(bool headerfile, const char *name,
                              const char *str, FILE *out)
{
	int l;
	if (headerfile)
		fprintf(out, "#define CONFIG_%s \"", name);
	else
		fprintf(out, "CONFIG_%s=\"", name);

	while (1) {
		l = strcspn(str, "\"\\");
		if (l) {
416
			xfwrite(str, l, 1, out);
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
			str += l;
		}
		if (!*str)
			break;
		fprintf(out, "\\%c", *str++);
	}
	fputs("\"\n", out);
}

static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
                              FILE *out, bool write_no)
{
	const char *str;

	switch (type) {
	case S_BOOLEAN:
	case S_TRISTATE:
		switch (sym_get_tristate_value(sym)) {
		case no:
			if (write_no)
				fprintf(out, "# CONFIG_%s is not set\n", sym->name);
			break;
		case mod:
			fprintf(out, "CONFIG_%s=m\n", sym->name);
			break;
		case yes:
			fprintf(out, "CONFIG_%s=y\n", sym->name);
			break;
		}
		break;
	case S_STRING:
		conf_write_string(false, sym->name, sym_get_string_value(sym), out);
		break;
	case S_HEX:
	case S_INT:
		str = sym_get_string_value(sym);
		fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
		break;
	case S_OTHER:
	case S_UNKNOWN:
		break;
	}
}

S
Sam Ravnborg 已提交
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
/*
 * Write out a minimal config.
 * All values that has default values are skipped as this is redundant.
 */
int conf_write_defconfig(const char *filename)
{
	struct symbol *sym;
	struct menu *menu;
	FILE *out;

	out = fopen(filename, "w");
	if (!out)
		return 1;

	sym_clear_all_valid();

	/* Traverse all menus to find all relevant symbols */
	menu = rootmenu.list;

	while (menu != NULL)
	{
		sym = menu->sym;
		if (sym == NULL) {
			if (!menu_is_visible(menu))
				goto next_menu;
		} else if (!sym_is_choice(sym)) {
			sym_calc_value(sym);
			if (!(sym->flags & SYMBOL_WRITE))
				goto next_menu;
			sym->flags &= ~SYMBOL_WRITE;
			/* If we cannot change the symbol - skip */
			if (!sym_is_changable(sym))
				goto next_menu;
			/* If symbol equals to default value - skip */
			if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
				goto next_menu;

			/*
			 * If symbol is a choice value and equals to the
			 * default for a choice - skip.
501 502 503
			 * But only if value is bool and equal to "y" and
			 * choice is not "optional".
			 * (If choice is "optional" then all values can be "n")
S
Sam Ravnborg 已提交
504 505 506 507 508 509 510
			 */
			if (sym_is_choice_value(sym)) {
				struct symbol *cs;
				struct symbol *ds;

				cs = prop_get_symbol(sym_get_choice_prop(sym));
				ds = sym_choice_default(cs);
511
				if (!sym_is_optional(cs) && sym == ds) {
512 513
					if ((sym->type == S_BOOLEAN) &&
					    sym_get_tristate_value(sym) == yes)
S
Sam Ravnborg 已提交
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537
						goto next_menu;
				}
			}
			conf_write_symbol(sym, sym->type, out, true);
		}
next_menu:
		if (menu->list != NULL) {
			menu = menu->list;
		}
		else if (menu->next != NULL) {
			menu = menu->next;
		} else {
			while ((menu = menu->parent)) {
				if (menu->next != NULL) {
					menu = menu->next;
					break;
				}
			}
		}
	}
	fclose(out);
	return 0;
}

L
Linus Torvalds 已提交
538 539
int conf_write(const char *name)
{
R
Roman Zippel 已提交
540
	FILE *out;
L
Linus Torvalds 已提交
541 542 543 544
	struct symbol *sym;
	struct menu *menu;
	const char *basename;
	const char *str;
545 546
	char dirname[128], tmpname[128], newname[128];
	enum symbol_type type;
L
Linus Torvalds 已提交
547 548 549 550 551 552 553 554 555 556 557 558
	time_t now;
	int use_timestamp = 1;
	char *env;

	dirname[0] = 0;
	if (name && name[0]) {
		struct stat st;
		char *slash;

		if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
			strcpy(dirname, name);
			strcat(dirname, "/");
R
Roman Zippel 已提交
559
			basename = conf_get_configname();
L
Linus Torvalds 已提交
560 561 562 563 564 565 566
		} else if ((slash = strrchr(name, '/'))) {
			int size = slash - name + 1;
			memcpy(dirname, name, size);
			dirname[size] = 0;
			if (slash[1])
				basename = slash + 1;
			else
R
Roman Zippel 已提交
567
				basename = conf_get_configname();
L
Linus Torvalds 已提交
568 569 570
		} else
			basename = name;
	} else
R
Roman Zippel 已提交
571
		basename = conf_get_configname();
L
Linus Torvalds 已提交
572

R
Roman Zippel 已提交
573 574 575 576 577 578 579 580 581
	sprintf(newname, "%s%s", dirname, basename);
	env = getenv("KCONFIG_OVERWRITECONFIG");
	if (!env || !*env) {
		sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
		out = fopen(tmpname, "w");
	} else {
		*tmpname = 0;
		out = fopen(newname, "w");
	}
L
Linus Torvalds 已提交
582 583
	if (!out)
		return 1;
R
Roman Zippel 已提交
584

585
	sym = sym_lookup("KERNELVERSION", 0);
L
Linus Torvalds 已提交
586 587 588 589 590 591
	sym_calc_value(sym);
	time(&now);
	env = getenv("KCONFIG_NOTIMESTAMP");
	if (env && *env)
		use_timestamp = 0;

592 593 594 595 596
	fprintf(out, _("#\n"
		       "# Automatically generated make config: don't edit\n"
		       "# Linux kernel version: %s\n"
		       "%s%s"
		       "#\n"),
L
Linus Torvalds 已提交
597 598 599 600
		     sym_get_string_value(sym),
		     use_timestamp ? "# " : "",
		     use_timestamp ? ctime(&now) : "");

601
	if (!conf_get_changed())
L
Linus Torvalds 已提交
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
		sym_clear_all_valid();

	menu = rootmenu.list;
	while (menu) {
		sym = menu->sym;
		if (!sym) {
			if (!menu_is_visible(menu))
				goto next;
			str = menu_get_prompt(menu);
			fprintf(out, "\n"
				     "#\n"
				     "# %s\n"
				     "#\n", str);
		} else if (!(sym->flags & SYMBOL_CHOICE)) {
			sym_calc_value(sym);
			if (!(sym->flags & SYMBOL_WRITE))
				goto next;
			sym->flags &= ~SYMBOL_WRITE;
			type = sym->type;
			if (type == S_TRISTATE) {
				sym_calc_value(modules_sym);
				if (modules_sym->curr.tri == no)
					type = S_BOOLEAN;
			}
626 627
			/* Write config symbol to file */
			conf_write_symbol(sym, type, out, true);
L
Linus Torvalds 已提交
628 629
		}

630
next:
L
Linus Torvalds 已提交
631 632 633 634 635 636 637 638 639 640 641 642 643 644
		if (menu->list) {
			menu = menu->list;
			continue;
		}
		if (menu->next)
			menu = menu->next;
		else while ((menu = menu->parent)) {
			if (menu->next) {
				menu = menu->next;
				break;
			}
		}
	}
	fclose(out);
R
Roman Zippel 已提交
645 646

	if (*tmpname) {
647
		strcat(dirname, basename);
R
Roman Zippel 已提交
648 649 650 651
		strcat(dirname, ".old");
		rename(newname, dirname);
		if (rename(tmpname, newname))
			return 1;
L
Linus Torvalds 已提交
652 653
	}

654 655
	printf(_("#\n"
		 "# configuration written to %s\n"
R
Roman Zippel 已提交
656
		 "#\n"), newname);
657

658
	sym_set_change_count(0);
L
Linus Torvalds 已提交
659 660 661

	return 0;
}
R
Roman Zippel 已提交
662

T
Trevor Keith 已提交
663
static int conf_split_config(void)
664
{
665 666
	const char *name;
	char path[128];
667 668 669 670 671
	char *s, *d, c;
	struct symbol *sym;
	struct stat sb;
	int res, i, fd;

672
	name = conf_get_autoconfig_name();
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
	conf_read_simple(name, S_DEF_AUTO);

	if (chdir("include/config"))
		return 1;

	res = 0;
	for_all_symbols(i, sym) {
		sym_calc_value(sym);
		if ((sym->flags & SYMBOL_AUTO) || !sym->name)
			continue;
		if (sym->flags & SYMBOL_WRITE) {
			if (sym->flags & SYMBOL_DEF_AUTO) {
				/*
				 * symbol has old and new value,
				 * so compare them...
				 */
				switch (sym->type) {
				case S_BOOLEAN:
				case S_TRISTATE:
					if (sym_get_tristate_value(sym) ==
					    sym->def[S_DEF_AUTO].tri)
						continue;
					break;
				case S_STRING:
				case S_HEX:
				case S_INT:
					if (!strcmp(sym_get_string_value(sym),
						    sym->def[S_DEF_AUTO].val))
						continue;
					break;
				default:
					break;
				}
			} else {
				/*
				 * If there is no old value, only 'no' (unset)
				 * is allowed as new value.
				 */
				switch (sym->type) {
				case S_BOOLEAN:
				case S_TRISTATE:
					if (sym_get_tristate_value(sym) == no)
						continue;
					break;
				default:
					break;
				}
			}
		} else if (!(sym->flags & SYMBOL_DEF_AUTO))
			/* There is neither an old nor a new value. */
			continue;
		/* else
		 *	There is an old value, but no new value ('no' (unset)
		 *	isn't saved in auto.conf, so the old value is always
		 *	different from 'no').
		 */

		/* Replace all '_' and append ".h" */
		s = sym->name;
		d = path;
		while ((c = *s++)) {
			c = tolower(c);
			*d++ = (c == '_') ? '/' : c;
		}
		strcpy(d, ".h");

		/* Assume directory path already exists. */
		fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
		if (fd == -1) {
			if (errno != ENOENT) {
				res = 1;
				break;
			}
			/*
			 * Create directory components,
			 * unless they exist already.
			 */
			d = path;
			while ((d = strchr(d, '/'))) {
				*d = 0;
				if (stat(path, &sb) && mkdir(path, 0755)) {
					res = 1;
					goto out;
				}
				*d++ = '/';
			}
			/* Try it again. */
			fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
			if (fd == -1) {
				res = 1;
				break;
			}
		}
		close(fd);
	}
out:
	if (chdir("../.."))
		return 1;

	return res;
}

R
Roman Zippel 已提交
775 776 777 778
int conf_write_autoconf(void)
{
	struct symbol *sym;
	const char *str;
779
	const char *name;
M
Michal Marek 已提交
780
	FILE *out, *tristate, *out_h;
R
Roman Zippel 已提交
781
	time_t now;
782
	int i;
R
Roman Zippel 已提交
783

784 785
	sym_clear_all_valid();

R
Roman Zippel 已提交
786 787
	file_write_dep("include/config/auto.conf.cmd");

788 789 790
	if (conf_split_config())
		return 1;

R
Roman Zippel 已提交
791 792 793 794
	out = fopen(".tmpconfig", "w");
	if (!out)
		return 1;

M
Michal Marek 已提交
795 796 797 798 799 800
	tristate = fopen(".tmpconfig_tristate", "w");
	if (!tristate) {
		fclose(out);
		return 1;
	}

R
Roman Zippel 已提交
801 802 803
	out_h = fopen(".tmpconfig.h", "w");
	if (!out_h) {
		fclose(out);
M
Michal Marek 已提交
804
		fclose(tristate);
R
Roman Zippel 已提交
805 806 807 808 809 810 811 812 813 814 815 816
		return 1;
	}

	sym = sym_lookup("KERNELVERSION", 0);
	sym_calc_value(sym);
	time(&now);
	fprintf(out, "#\n"
		     "# Automatically generated make config: don't edit\n"
		     "# Linux kernel version: %s\n"
		     "# %s"
		     "#\n",
		     sym_get_string_value(sym), ctime(&now));
M
Michal Marek 已提交
817 818 819
	fprintf(tristate, "#\n"
			  "# Automatically generated - do not edit\n"
			  "\n");
R
Roman Zippel 已提交
820 821 822 823 824 825 826 827 828 829 830 831
	fprintf(out_h, "/*\n"
		       " * Automatically generated C config: don't edit\n"
		       " * Linux kernel version: %s\n"
		       " * %s"
		       " */\n"
		       "#define AUTOCONF_INCLUDED\n",
		       sym_get_string_value(sym), ctime(&now));

	for_all_symbols(i, sym) {
		sym_calc_value(sym);
		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
			continue;
832 833 834 835 836

		/* write symbol to config file */
		conf_write_symbol(sym, sym->type, out, false);

		/* update autoconf and tristate files */
R
Roman Zippel 已提交
837 838 839 840 841 842 843
		switch (sym->type) {
		case S_BOOLEAN:
		case S_TRISTATE:
			switch (sym_get_tristate_value(sym)) {
			case no:
				break;
			case mod:
M
Michal Marek 已提交
844
				fprintf(tristate, "CONFIG_%s=M\n", sym->name);
R
Roman Zippel 已提交
845 846 847
				fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
				break;
			case yes:
M
Michal Marek 已提交
848 849 850
				if (sym->type == S_TRISTATE)
					fprintf(tristate, "CONFIG_%s=Y\n",
							sym->name);
R
Roman Zippel 已提交
851 852 853 854 855
				fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
				break;
			}
			break;
		case S_STRING:
856
			conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
R
Roman Zippel 已提交
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
			break;
		case S_HEX:
			str = sym_get_string_value(sym);
			if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
				fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
				break;
			}
		case S_INT:
			str = sym_get_string_value(sym);
			fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
			break;
		default:
			break;
		}
	}
	fclose(out);
M
Michal Marek 已提交
873
	fclose(tristate);
R
Roman Zippel 已提交
874 875 876 877
	fclose(out_h);

	name = getenv("KCONFIG_AUTOHEADER");
	if (!name)
878
		name = "include/generated/autoconf.h";
R
Roman Zippel 已提交
879 880
	if (rename(".tmpconfig.h", name))
		return 1;
M
Michal Marek 已提交
881 882 883 884 885
	name = getenv("KCONFIG_TRISTATE");
	if (!name)
		name = "include/config/tristate.conf";
	if (rename(".tmpconfig_tristate", name))
		return 1;
886
	name = conf_get_autoconfig_name();
R
Roman Zippel 已提交
887 888 889 890 891 892 893 894 895
	/*
	 * This must be the last step, kbuild has a dependency on auto.conf
	 * and this marks the successful completion of the previous steps.
	 */
	if (rename(".tmpconfig", name))
		return 1;

	return 0;
}
896

897
static int sym_change_count;
898
static void (*conf_changed_callback)(void);
899 900 901

void sym_set_change_count(int count)
{
902
	int _sym_change_count = sym_change_count;
903
	sym_change_count = count;
904 905 906
	if (conf_changed_callback &&
	    (bool)_sym_change_count != (bool)count)
		conf_changed_callback();
907 908 909 910
}

void sym_add_change_count(int count)
{
911
	sym_set_change_count(count + sym_change_count);
912 913
}

914 915 916 917
bool conf_get_changed(void)
{
	return sym_change_count;
}
918 919 920 921 922

void conf_set_changed_callback(void (*fn)(void))
{
	conf_changed_callback = fn;
}
923

924 925 926 927 928 929
static void randomize_choice_values(struct symbol *csym)
{
	struct property *prop;
	struct symbol *sym;
	struct expr *e;
	int cnt, def;
930

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
	/*
	 * If choice is mod then we may have more items slected
	 * and if no then no-one.
	 * In both cases stop.
	 */
	if (csym->curr.tri != yes)
		return;

	prop = sym_get_choice_prop(csym);

	/* count entries in choice block */
	cnt = 0;
	expr_list_for_each_sym(prop->expr, e, sym)
		cnt++;

	/*
	 * find a random value and set it to yes,
	 * set the rest to no so we have only one set
	 */
	def = (rand() % cnt);

	cnt = 0;
	expr_list_for_each_sym(prop->expr, e, sym) {
		if (def == cnt++) {
			sym->def[S_DEF_USER].tri = yes;
			csym->def[S_DEF_USER].val = sym;
		}
		else {
			sym->def[S_DEF_USER].tri = no;
		}
	}
	csym->flags |= SYMBOL_DEF_USER;
	/* clear VALID to get value calculated */
	csym->flags &= ~(SYMBOL_VALID);
}

static void set_all_choice_values(struct symbol *csym)
968 969
{
	struct property *prop;
970
	struct symbol *sym;
971
	struct expr *e;
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990

	prop = sym_get_choice_prop(csym);

	/*
	 * Set all non-assinged choice values to no
	 */
	expr_list_for_each_sym(prop->expr, e, sym) {
		if (!sym_has_value(sym))
			sym->def[S_DEF_USER].tri = no;
	}
	csym->flags |= SYMBOL_DEF_USER;
	/* clear VALID to get value calculated */
	csym->flags &= ~(SYMBOL_VALID);
}

void conf_set_all_new_symbols(enum conf_def_mode mode)
{
	struct symbol *sym, *csym;
	int i, cnt;
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008

	for_all_symbols(i, sym) {
		if (sym_has_value(sym))
			continue;
		switch (sym_get_type(sym)) {
		case S_BOOLEAN:
		case S_TRISTATE:
			switch (mode) {
			case def_yes:
				sym->def[S_DEF_USER].tri = yes;
				break;
			case def_mod:
				sym->def[S_DEF_USER].tri = mod;
				break;
			case def_no:
				sym->def[S_DEF_USER].tri = no;
				break;
			case def_random:
1009 1010
				cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
				sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
1011 1012 1013 1014
				break;
			default:
				continue;
			}
1015
			if (!(sym_is_choice(sym) && mode == def_random))
1016 1017 1018 1019 1020 1021 1022 1023
				sym->flags |= SYMBOL_DEF_USER;
			break;
		default:
			break;
		}

	}

A
Al Viro 已提交
1024
	sym_clear_all_valid();
1025

1026 1027 1028 1029 1030 1031 1032 1033 1034
	/*
	 * We have different type of choice blocks.
	 * If curr.tri equal to mod then we can select several
	 * choice symbols in one block.
	 * In this case we do nothing.
	 * If curr.tri equal yes then only one symbol can be
	 * selected in a choice block and we set it to yes,
	 * and the rest to no.
	 */
1035 1036 1037 1038 1039
	for_all_symbols(i, csym) {
		if (sym_has_value(csym) || !sym_is_choice(csym))
			continue;

		sym_calc_value(csym);
1040 1041 1042 1043
		if (mode == def_random)
			randomize_choice_values(csym);
		else
			set_all_choice_values(csym);
1044 1045
	}
}