[thirdparty/util-linux.git] / libblkid / src / read.c

/*
 * read.c - read the blkid cache from disk, to avoid scanning all devices
 *
 * Copyright (C) 2001, 2003 Theodore Y. Ts'o
 * Copyright (C) 2001 Andreas Dilger
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 * %End-Header%
 */


#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#include "blkidP.h"

#ifdef HAVE_STDLIB_H
# ifndef _XOPEN_SOURCE
#  define _XOPEN_SOURCE 600	/* for inclusion of strtoull */
# endif
# include <stdlib.h>
#endif

/*
 * File format:
 *
 *	<device [<NAME="value"> ...]>device_name</device>
 *
 *	The following tags are required for each entry:
 *	<ID="id">	unique (within this file) ID number of this device
 *	<TIME="sec.usec"> (time_t and suseconds_t) time this entry was last
 *	                 read from disk
 *	<TYPE="type">	(detected) type of filesystem/data for this partition
 *
 *	The following tags may be present, depending on the device contents
 *	<LABEL="label">	(user supplied) label (volume name, etc)
 *	<UUID="uuid">	(generated) universally unique identifier (serial no)
 */

static char *skip_over_blank(char *cp)
{
	while (*cp && isspace(*cp))
		cp++;
	return cp;
}

static char *skip_over_word(char *cp)
{
	char ch;

	while ((ch = *cp)) {
		/* If we see a backslash, skip the next character */
		if (ch == '\\') {
			cp++;
			if (*cp == '\0')
				break;
			cp++;
			continue;
		}
		if (isspace(ch) || ch == '<' || ch == '>')
			break;
		cp++;
	}
	return cp;
}

static char *strip_line(char *line)
{
	char	*p;

	line = skip_over_blank(line);

	p = line + strlen(line) - 1;

	while (*line) {
		if (isspace(*p))
			*p-- = '\0';
		else
			break;
	}

	return line;
}

#if 0
static char *parse_word(char **buf)
{
	char *word, *next;

	word = *buf;
	if (*word == '\0')
		return NULL;

	word = skip_over_blank(word);
	next = skip_over_word(word);
	if (*next) {
		char *end = next - 1;
		if (*end == '"' || *end == '\'')
			*end = '\0';
		*next++ = '\0';
	}
	*buf = next;

	if (*word == '"' || *word == '\'')
		word++;
	return word;
}
#endif

/*
 * Start parsing a new line from the cache.
 *
 * line starts with "<device" return 1 -> continue parsing line
 * line starts with "<foo", empty, or # return 0 -> skip line
 * line starts with other, return -BLKID_ERR_CACHE -> error
 */
static int parse_start(char **cp)
{
	char *p;

	p = strip_line(*cp);

	/* Skip comment or blank lines.  We can't just NUL the first '#' char,
	 * in case it is inside quotes, or escaped.
	 */
	if (*p == '\0' || *p == '#')
		return 0;

	if (!strncmp(p, "<device", 7)) {
		DBG(READ, ul_debug("found device header: %8s", p));
		p += 7;

		*cp = p;
		return 1;
	}

	if (*p == '<')
		return 0;

	return -BLKID_ERR_CACHE;
}

/* Consume the remaining XML on the line (cosmetic only) */
static int parse_end(char **cp)
{
	*cp = skip_over_blank(*cp);

	if (!strncmp(*cp, "</device>", 9)) {
		DBG(READ, ul_debug("found device trailer %9s", *cp));
		*cp += 9;
		return 0;
	}

	return -BLKID_ERR_CACHE;
}

/*
 * Allocate a new device struct with device name filled in.  Will handle
 * finding the device on lines of the form:
 * <device foo=bar>devname</device>
 * <device>devname<foo>bar</foo></device>
 */
static int parse_dev(blkid_cache cache, blkid_dev *dev, char **cp)
{
	char *start, *tmp, *end, *name;
	int ret;

	if ((ret = parse_start(cp)) <= 0)
		return ret;

	start = tmp = strchr(*cp, '>');
	if (!start) {
		DBG(READ, ul_debug("blkid: short line parsing dev: %s", *cp));
		return -BLKID_ERR_CACHE;
	}
	start = skip_over_blank(start + 1);
	end = skip_over_word(start);

	DBG(READ, ul_debug("device should be %*s",
			       (int)(end - start), start));

	if (**cp == '>')
		*cp = end;
	else
		(*cp)++;

	*tmp = '\0';

	if (!(tmp = strrchr(end, '<')) || parse_end(&tmp) < 0) {
		DBG(READ, ul_debug("blkid: missing </device> ending: %s", end));
	} else if (tmp)
		*tmp = '\0';

	if (end - start <= 1) {
		DBG(READ, ul_debug("blkid: empty device name: %s", *cp));
		return -BLKID_ERR_CACHE;
	}

	name = strndup(start, end - start);
	if (name == NULL)
		return -BLKID_ERR_MEM;

	DBG(READ, ul_debug("found dev %s", name));

	if (!(*dev = blkid_get_dev(cache, name, BLKID_DEV_CREATE))) {
		free(name);
		return -BLKID_ERR_MEM;
	}

	free(name);
	return 1;
}

/*
 * Extract a tag of the form NAME="value" from the line.
 */
static int parse_token(char **name, char **value, char **cp)
{
	char *end;

	if (!name || !value || !cp)
		return -BLKID_ERR_PARAM;

	if (!(*value = strchr(*cp, '=')))
		return 0;

	**value = '\0';
	*name = strip_line(*cp);
	*value = skip_over_blank(*value + 1);

	if (**value == '"') {
		char *p = end = *value + 1;

		/* convert 'foo\"bar'  to 'foo"bar' */
		while (*p) {
			if (*p == '\\') {
				p++;
				*end = *p;
			} else {
				*end = *p;
				if (*p == '"')
					break;
			}
			p++;
			end++;
		}

		if (*end != '"') {
			DBG(READ, ul_debug("unbalanced quotes at: %s", *value));
			*cp = *value;
			return -BLKID_ERR_CACHE;
		}
		(*value)++;
		*end = '\0';
		end = ++p;
	} else {
		end = skip_over_word(*value);
		if (*end) {
			*end = '\0';
			end++;
		}
	}
	*cp = end;

	return 1;
}

/*
 * Extract a tag from the line.
 *
 * Return 1 if a valid tag was found.
 * Return 0 if no tag found.
 * Return -ve error code.
 */
static int parse_tag(blkid_cache cache, blkid_dev dev, char **cp)
{
	char *name = NULL;
	char *value = NULL;
	int ret;

	if (!cache || !dev)
		return -BLKID_ERR_PARAM;

	if ((ret = parse_token(&name, &value, cp)) <= 0)
		return ret;

	DBG(READ, ul_debug("tag: %s=\"%s\"", name, value));

	errno = 0;

	/* Some tags are stored directly in the device struct */
	if (!strcmp(name, "DEVNO")) {
		dev->bid_devno = strtoull(value, NULL, 0);
		if (errno)
			return -errno;
	} else if (!strcmp(name, "PRI")) {
		dev->bid_pri = strtol(value, NULL, 0);
		if (errno)
			return -errno;
	} else if (!strcmp(name, "TIME")) {
		char *end = NULL;

		dev->bid_time = strtoull(value, &end, 0);
		if (errno == 0 && end && *end == '.')
			dev->bid_utime = strtoull(end + 1, NULL, 0);
		if (errno)
			return -errno;
	} else
		ret = blkid_set_tag(dev, name, value, strlen(value));

	return ret < 0 ? ret : 1;
}

/*
 * Parse a single line of data, and return a newly allocated dev struct.
 * Add the new device to the cache struct, if one was read.
 *
 * Lines are of the form <device [TAG="value" ...]>/dev/foo</device>
 *
 * Returns -ve value on error.
 * Returns 0 otherwise.
 * If a valid device was read, *dev_p is non-NULL, otherwise it is NULL
 * (e.g. comment lines, unknown XML content, etc).
 */
static int blkid_parse_line(blkid_cache cache, blkid_dev *dev_p, char *cp)
{
	blkid_dev dev;
	int ret;

	if (!cache || !dev_p)
		return -BLKID_ERR_PARAM;

	*dev_p = NULL;

	DBG(READ, ul_debug("line: %s", cp));

	if ((ret = parse_dev(cache, dev_p, &cp)) <= 0)
		return ret;

	dev = *dev_p;

	while ((ret = parse_tag(cache, dev, &cp)) > 0) {
		;
	}

	if (dev->bid_type == NULL) {
		DBG(READ, ul_debug("blkid: device %s has no TYPE",dev->bid_name));
		blkid_free_dev(dev);
		goto done;
	}

done:
	return ret;
}

/*
 * Parse the specified filename, and return the data in the supplied or
 * a newly allocated cache struct.  If the file doesn't exist, return a
 * new empty cache struct.
 */
void blkid_read_cache(blkid_cache cache)
{
	FILE *file;
	char buf[4096];
	int fd, lineno = 0;
	struct stat st;

	/*
	 * If the file doesn't exist, then we just return an empty
	 * struct so that the cache can be populated.
	 */
	if ((fd = open(cache->bic_filename, O_RDONLY|O_CLOEXEC)) < 0)
		return;
	if (fstat(fd, &st) < 0)
		goto errout;
	if ((st.st_mtime == cache->bic_ftime) ||
	    (cache->bic_flags & BLKID_BIC_FL_CHANGED)) {
		DBG(CACHE, ul_debug("skipping re-read of %s",
					cache->bic_filename));
		goto errout;
	}

	DBG(CACHE, ul_debug("reading cache file %s",
				cache->bic_filename));

	file = fdopen(fd, "r" UL_CLOEXECSTR);
	if (!file)
		goto errout;

	while (fgets(buf, sizeof(buf), file)) {
		blkid_dev dev;
		unsigned int end;

		lineno++;
		if (buf[0] == 0)
			continue;
		end = strlen(buf) - 1;
		/* Continue reading next line if it ends with a backslash */
		while (end < (sizeof(buf) - 2) && buf[end] == '\\' &&
		       fgets(buf + end, sizeof(buf) - end, file)) {
			end = strlen(buf) - 1;
			lineno++;
		}

		if (blkid_parse_line(cache, &dev, buf) < 0) {
			DBG(READ, ul_debug("blkid: bad format on line %d", lineno));
			continue;
		}
	}
	fclose(file);

	/*
	 * Initially we do not need to write out the cache file.
	 */
	cache->bic_flags &= ~BLKID_BIC_FL_CHANGED;
	cache->bic_ftime = st.st_mtime;

	return;
errout:
	close(fd);
}

#ifdef TEST_PROGRAM

int main(int argc, char**argv)
{
	blkid_cache cache = NULL;
	int ret;

	blkid_init_debug(BLKID_DEBUG_ALL);
	if (argc > 2) {
		fprintf(stderr, "Usage: %s [filename]\n"
			"Test parsing of the cache (filename)\n", argv[0]);
		exit(1);
	}
	if ((ret = blkid_get_cache(&cache, argv[1])) < 0)
		fprintf(stderr, "error %d reading cache file %s\n", ret,
			argv[1] ? argv[1] : blkid_get_cache_filename(NULL));

	blkid_put_cache(cache);

	return ret;
}
#endif
Commit	Line	Data
a0948ffe KZ	1	/*
	2	* read.c - read the blkid cache from disk, to avoid scanning all devices
	3	*
	4	* Copyright (C) 2001, 2003 Theodore Y. Ts'o
	5	* Copyright (C) 2001 Andreas Dilger
	6	*
	7	* %Begin-Header%
	8	* This file may be redistributed under the terms of the
	9	* GNU Lesser General Public License.
	10	* %End-Header%
	11	*/
	12
a0948ffe KZ	13
	14	#include <stdio.h>
	15	#include <ctype.h>
	16	#include <string.h>
	17	#include <time.h>
	18	#include <sys/types.h>
	19	#include <sys/stat.h>
	20	#include <fcntl.h>
	21	#include <unistd.h>
fbc333fe	22	#ifdef HAVE_ERRNO_H
a0948ffe KZ	23	#include <errno.h>
	24	#endif
	25
	26	#include "blkidP.h"
a0948ffe	27
fbc333fe	28	#ifdef HAVE_STDLIB_H
d58c47d9 FG	29	# ifndef _XOPEN_SOURCE
	30	# define _XOPEN_SOURCE 600 /* for inclusion of strtoull */
	31	# endif
	32	# include <stdlib.h>
	33	#endif
	34
a0948ffe KZ	35	/*
	36	* File format:
	37	*
	38	* <device [<NAME="value"> ...]>device_name</device>
	39	*
	40	* The following tags are required for each entry:
	41	* <ID="id"> unique (within this file) ID number of this device
6c2f2b9d KZ	42	* <TIME="sec.usec"> (time_t and suseconds_t) time this entry was last
6c2f2b9d KZ	43	* read from disk
a0948ffe KZ	44	* <TYPE="type"> (detected) type of filesystem/data for this partition
	45	*
	46	* The following tags may be present, depending on the device contents
	47	* <LABEL="label"> (user supplied) label (volume name, etc)
	48	* <UUID="uuid"> (generated) universally unique identifier (serial no)
	49	*/
	50
	51	static char skip_over_blank(char cp)
	52	{
	53	while (cp && isspace(cp))
	54	cp++;
	55	return cp;
	56	}
	57
	58	static char skip_over_word(char cp)
	59	{
	60	char ch;
	61
	62	while ((ch = *cp)) {
	63	/* If we see a backslash, skip the next character */
	64	if (ch == '\\') {
	65	cp++;
	66	if (*cp == '\0')
	67	break;
	68	cp++;
	69	continue;
	70	}
	71	if (isspace(ch) \|\| ch == '<' \|\| ch == '>')
	72	break;
	73	cp++;
	74	}
	75	return cp;
	76	}
	77
	78	static char strip_line(char line)
	79	{
	80	char *p;
	81
	82	line = skip_over_blank(line);
	83
	84	p = line + strlen(line) - 1;
	85
	86	while (*line) {
	87	if (isspace(*p))
	88	*p-- = '\0';
	89	else
	90	break;
	91	}
	92
	93	return line;
	94	}
	95
	96	#if 0
	97	static char parse_word(char *buf)
	98	{
	99	char word, next;
	100
	101	word = *buf;
	102	if (*word == '\0')
	103	return NULL;
	104
	105	word = skip_over_blank(word);
	106	next = skip_over_word(word);
	107	if (*next) {
108	char *end = next - 1;
109	if (end == '"' \|\| end == '\'')
110	*end = '\0';
111	*next++ = '\0';
112	}
113	*buf = next;
114
115	if (word == '"' \|\| word == '\'')
116	word++;
117	return word;
118	}
119	#endif
120
121	/*
122	* Start parsing a new line from the cache.
123	*
124	* line starts with "<device" return 1 -> continue parsing line
125	* line starts with "<foo", empty, or # return 0 -> skip line
126	* line starts with other, return -BLKID_ERR_CACHE -> error
127	*/
128	static int parse_start(char **cp)
129	{
130	char *p;
131
132	p = strip_line(*cp);
133
134	/* Skip comment or blank lines. We can't just NUL the first '#' char,
135	* in case it is inside quotes, or escaped.
136	*/
137	if (p == '\0' \|\| p == '#')
138	return 0;
139
140	if (!strncmp(p, "<device", 7)) {
c62a6311	141	DBG(READ, ul_debug("found device header: %8s", p));
a0948ffe KZ	142	p += 7;
	143
	144	*cp = p;
	145	return 1;
	146	}
	147
	148	if (*p == '<')
	149	return 0;
	150
	151	return -BLKID_ERR_CACHE;
	152	}
	153
	154	/* Consume the remaining XML on the line (cosmetic only) */
	155	static int parse_end(char **cp)
	156	{
	157	cp = skip_over_blank(cp);
	158
	159	if (!strncmp(*cp, "</device>", 9)) {
c62a6311	160	DBG(READ, ul_debug("found device trailer %9s", *cp));
a0948ffe KZ	161	*cp += 9;
	162	return 0;
	163	}
	164
	165	return -BLKID_ERR_CACHE;
	166	}
	167
	168	/*
	169	* Allocate a new device struct with device name filled in. Will handle
	170	* finding the device on lines of the form:
	171	* <device foo=bar>devname</device>
	172	* <device>devname<foo>bar</foo></device>
	173	*/
	174	static int parse_dev(blkid_cache cache, blkid_dev dev, char *cp)
	175	{
	176	char start, tmp, end, name;
	177	int ret;
	178
	179	if ((ret = parse_start(cp)) <= 0)
	180	return ret;
	181
	182	start = tmp = strchr(*cp, '>');
	183	if (!start) {
c62a6311	184	DBG(READ, ul_debug("blkid: short line parsing dev: %s", *cp));
a0948ffe KZ	185	return -BLKID_ERR_CACHE;
	186	}
	187	start = skip_over_blank(start + 1);
	188	end = skip_over_word(start);
	189
c62a6311	190	DBG(READ, ul_debug("device should be %*s",
a0948ffe KZ	191	(int)(end - start), start));
	192
	193	if (**cp == '>')
	194	*cp = end;
	195	else
	196	(*cp)++;
	197
	198	*tmp = '\0';
	199
	200	if (!(tmp = strrchr(end, '<')) \|\| parse_end(&tmp) < 0) {
c62a6311	201	DBG(READ, ul_debug("blkid: missing </device> ending: %s", end));
a0948ffe KZ	202	} else if (tmp)
	203	*tmp = '\0';
	204
	205	if (end - start <= 1) {
c62a6311	206	DBG(READ, ul_debug("blkid: empty device name: %s", *cp));
a0948ffe KZ	207	return -BLKID_ERR_CACHE;
	208	}
	209
e0a9b8cf	210	name = strndup(start, end - start);
a0948ffe KZ	211	if (name == NULL)
	212	return -BLKID_ERR_MEM;
	213
c62a6311	214	DBG(READ, ul_debug("found dev %s", name));
a0948ffe KZ	215
	216	if (!(*dev = blkid_get_dev(cache, name, BLKID_DEV_CREATE))) {
	217	free(name);
	218	return -BLKID_ERR_MEM;
	219	}
	220
	221	free(name);
	222	return 1;
	223	}
	224
	225	/*
	226	* Extract a tag of the form NAME="value" from the line.
	227	*/
	228	static int parse_token(char name, char value, char **cp)
	229	{
	230	char *end;
	231
	232	if (!name \|\| !value \|\| !cp)
	233	return -BLKID_ERR_PARAM;
	234
	235	if (!(value = strchr(cp, '=')))
	236	return 0;
	237
	238	**value = '\0';
	239	name = strip_line(cp);
	240	value = skip_over_blank(value + 1);
	241
	242	if (**value == '"') {
89e90ae7 KZ	243	char p = end = value + 1;
	244
	245	/* convert 'foo\"bar' to 'foo"bar' */
	246	while (*p) {
	247	if (*p == '\\') {
	248	p++;
	249	end = p;
	250	} else {
	251	end = p;
	252	if (*p == '"')
	253	break;
	254	}
	255	p++;
	256	end++;
	257	}
	258
	259	if (*end != '"') {
c62a6311	260	DBG(READ, ul_debug("unbalanced quotes at: %s", *value));
a0948ffe KZ	261	cp = value;
	262	return -BLKID_ERR_CACHE;
	263	}
	264	(*value)++;
	265	*end = '\0';
89e90ae7	266	end = ++p;
a0948ffe KZ	267	} else {
	268	end = skip_over_word(*value);
	269	if (*end) {
	270	*end = '\0';
	271	end++;
	272	}
	273	}
	274	*cp = end;
	275
	276	return 1;
	277	}
	278
a0948ffe KZ	279	/*
	280	* Extract a tag from the line.
	281	*
	282	* Return 1 if a valid tag was found.
	283	* Return 0 if no tag found.
	284	* Return -ve error code.
	285	*/
	286	static int parse_tag(blkid_cache cache, blkid_dev dev, char **cp)
	287	{
3d604b43 KZ	288	char *name = NULL;
3d604b43 KZ	289	char *value = NULL;
a0948ffe KZ	290	int ret;
	291
	292	if (!cache \|\| !dev)
	293	return -BLKID_ERR_PARAM;
	294
f6b6beaf	295	if ((ret = parse_token(&name, &value, cp)) <= 0)
a0948ffe KZ	296	return ret;
a0948ffe KZ	297
14308bc3 KZ	298	DBG(READ, ul_debug("tag: %s=\"%s\"", name, value));
14308bc3 KZ	299
0395e8f7 KZ	300	errno = 0;
0395e8f7 KZ	301
a0948ffe	302	/* Some tags are stored directly in the device struct */
0395e8f7	303	if (!strcmp(name, "DEVNO")) {
87918040	304	dev->bid_devno = strtoull(value, NULL, 0);
0395e8f7 KZ	305	if (errno)
	306	return -errno;
	307	} else if (!strcmp(name, "PRI")) {
87918040	308	dev->bid_pri = strtol(value, NULL, 0);
0395e8f7 KZ	309	if (errno)
	310	return -errno;
	311	} else if (!strcmp(name, "TIME")) {
6c2f2b9d	312	char *end = NULL;
0395e8f7	313
9385a11d	314	dev->bid_time = strtoull(value, &end, 0);
0395e8f7	315	if (errno == 0 && end && *end == '.')
87918040	316	dev->bid_utime = strtoull(end + 1, NULL, 0);
0395e8f7 KZ	317	if (errno)
0395e8f7 KZ	318	return -errno;
6c2f2b9d	319	} else
a0948ffe KZ	320	ret = blkid_set_tag(dev, name, value, strlen(value));
a0948ffe KZ	321
a0948ffe KZ	322	return ret < 0 ? ret : 1;
	323	}
	324
	325	/*
	326	* Parse a single line of data, and return a newly allocated dev struct.
	327	* Add the new device to the cache struct, if one was read.
	328	*
	329	* Lines are of the form <device [TAG="value" ...]>/dev/foo</device>
	330	*
	331	* Returns -ve value on error.
	332	* Returns 0 otherwise.
	333	* If a valid device was read, *dev_p is non-NULL, otherwise it is NULL
	334	* (e.g. comment lines, unknown XML content, etc).
	335	*/
	336	static int blkid_parse_line(blkid_cache cache, blkid_dev dev_p, char cp)
	337	{
	338	blkid_dev dev;
	339	int ret;
	340
	341	if (!cache \|\| !dev_p)
	342	return -BLKID_ERR_PARAM;
	343
	344	*dev_p = NULL;
	345
c62a6311	346	DBG(READ, ul_debug("line: %s", cp));
a0948ffe KZ	347
	348	if ((ret = parse_dev(cache, dev_p, &cp)) <= 0)
	349	return ret;
	350
	351	dev = *dev_p;
	352
	353	while ((ret = parse_tag(cache, dev, &cp)) > 0) {
	354	;
	355	}
	356
	357	if (dev->bid_type == NULL) {
c62a6311	358	DBG(READ, ul_debug("blkid: device %s has no TYPE",dev->bid_name));
a0948ffe	359	blkid_free_dev(dev);
fa5241d1	360	goto done;
a0948ffe KZ	361	}
a0948ffe KZ	362
fa5241d1	363	done:
a0948ffe KZ	364	return ret;
	365	}
	366
	367	/*
	368	* Parse the specified filename, and return the data in the supplied or
	369	* a newly allocated cache struct. If the file doesn't exist, return a
	370	* new empty cache struct.
	371	*/
	372	void blkid_read_cache(blkid_cache cache)
	373	{
	374	FILE *file;
	375	char buf[4096];
	376	int fd, lineno = 0;
	377	struct stat st;
	378
a0948ffe KZ	379	/*
	380	* If the file doesn't exist, then we just return an empty
	381	* struct so that the cache can be populated.
	382	*/
49a8f58e	383	if ((fd = open(cache->bic_filename, O_RDONLY\|O_CLOEXEC)) < 0)
a0948ffe KZ	384	return;
	385	if (fstat(fd, &st) < 0)
	386	goto errout;
	387	if ((st.st_mtime == cache->bic_ftime) \|\|
	388	(cache->bic_flags & BLKID_BIC_FL_CHANGED)) {
c62a6311	389	DBG(CACHE, ul_debug("skipping re-read of %s",
a0948ffe KZ	390	cache->bic_filename));
	391	goto errout;
	392	}
	393
c62a6311	394	DBG(CACHE, ul_debug("reading cache file %s",
a0948ffe KZ	395	cache->bic_filename));
a0948ffe KZ	396
4000fc12	397	file = fdopen(fd, "r" UL_CLOEXECSTR);
a0948ffe KZ	398	if (!file)
	399	goto errout;
	400
	401	while (fgets(buf, sizeof(buf), file)) {
	402	blkid_dev dev;
	403	unsigned int end;
	404
	405	lineno++;
	406	if (buf[0] == 0)
	407	continue;
	408	end = strlen(buf) - 1;
	409	/* Continue reading next line if it ends with a backslash */
358ef9c0	410	while (end < (sizeof(buf) - 2) && buf[end] == '\\' &&
a0948ffe KZ	411	fgets(buf + end, sizeof(buf) - end, file)) {
	412	end = strlen(buf) - 1;
	413	lineno++;
	414	}
	415
	416	if (blkid_parse_line(cache, &dev, buf) < 0) {
c62a6311	417	DBG(READ, ul_debug("blkid: bad format on line %d", lineno));
a0948ffe KZ	418	continue;
	419	}
	420	}
	421	fclose(file);
	422
	423	/*
	424	* Initially we do not need to write out the cache file.
	425	*/
	426	cache->bic_flags &= ~BLKID_BIC_FL_CHANGED;
	427	cache->bic_ftime = st.st_mtime;
	428
	429	return;
	430	errout:
	431	close(fd);
a0948ffe KZ	432	}
	433
	434	#ifdef TEST_PROGRAM
a0948ffe KZ	435
	436	int main(int argc, char**argv)
	437	{
	438	blkid_cache cache = NULL;
	439	int ret;
	440
0540ea54	441	blkid_init_debug(BLKID_DEBUG_ALL);
a0948ffe KZ	442	if (argc > 2) {
	443	fprintf(stderr, "Usage: %s [filename]\n"
	444	"Test parsing of the cache (filename)\n", argv[0]);
	445	exit(1);
	446	}
	447	if ((ret = blkid_get_cache(&cache, argv[1])) < 0)
	448	fprintf(stderr, "error %d reading cache file %s\n", ret,
b82590ad	449	argv[1] ? argv[1] : blkid_get_cache_filename(NULL));
a0948ffe KZ	450
	451	blkid_put_cache(cache);
	452
	453	return ret;
	454	}
	455	#endif