[thirdparty/git.git] / path.c

/*
 * I'm tired of doing "vsnprintf()" etc just to open a
 * file, so here's a "return static buffer with printf"
 * interface for paths.
 *
 * It's obviously not thread-safe. Sue me. But it's quite
 * useful for doing things like
 *
 *   f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
 *
 * which is what it's designed for.
 */
#include "cache.h"

static char bad_path[] = "/bad-path/";

static char *get_pathname(void)
{
	static char pathname_array[4][PATH_MAX];
	static int index;
	return pathname_array[3 & ++index];
}

static char *cleanup_path(char *path)
{
	/* Clean it up */
	if (!memcmp(path, "./", 2)) {
		path += 2;
		while (*path == '/')
			path++;
	}
	return path;
}

char *mkpath(const char *fmt, ...)
{
	va_list args;
	unsigned len;
	char *pathname = get_pathname();

	va_start(args, fmt);
	len = vsnprintf(pathname, PATH_MAX, fmt, args);
	va_end(args);
	if (len >= PATH_MAX)
		return bad_path;
	return cleanup_path(pathname);
}

char *git_path(const char *fmt, ...)
{
	const char *git_dir = get_git_dir();
	char *pathname = get_pathname();
	va_list args;
	unsigned len;

	len = strlen(git_dir);
	if (len > PATH_MAX-100)
		return bad_path;
	memcpy(pathname, git_dir, len);
	if (len && git_dir[len-1] != '/')
		pathname[len++] = '/';
	va_start(args, fmt);
	len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
	va_end(args);
	if (len >= PATH_MAX)
		return bad_path;
	return cleanup_path(pathname);
}


/* git_mkstemp() - create tmp file honoring TMPDIR variable */
int git_mkstemp(char *path, size_t len, const char *template)
{
	const char *tmp;
	size_t n;

	tmp = getenv("TMPDIR");
	if (!tmp)
		tmp = "/tmp";
	n = snprintf(path, len, "%s/%s", tmp, template);
	if (len <= n) {
		errno = ENAMETOOLONG;
		return -1;
	}
	return mkstemp(path);
}


int validate_headref(const char *path)
{
	struct stat st;
	char *buf, buffer[256];
	unsigned char sha1[20];
	int fd;
	ssize_t len;

	if (lstat(path, &st) < 0)
		return -1;

	/* Make sure it is a "refs/.." symlink */
	if (S_ISLNK(st.st_mode)) {
		len = readlink(path, buffer, sizeof(buffer)-1);
		if (len >= 5 && !memcmp("refs/", buffer, 5))
			return 0;
		return -1;
	}

	/*
	 * Anything else, just open it and try to see if it is a symbolic ref.
	 */
	fd = open(path, O_RDONLY);
	if (fd < 0)
		return -1;
	len = read_in_full(fd, buffer, sizeof(buffer)-1);
	close(fd);

	/*
	 * Is it a symbolic ref?
	 */
	if (len < 4)
		return -1;
	if (!memcmp("ref:", buffer, 4)) {
		buf = buffer + 4;
		len -= 4;
		while (len && isspace(*buf))
			buf++, len--;
		if (len >= 5 && !memcmp("refs/", buf, 5))
			return 0;
	}

	/*
	 * Is this a detached HEAD?
	 */
	if (!get_sha1_hex(buffer, sha1))
		return 0;

	return -1;
}

static char *user_path(char *buf, char *path, int sz)
{
	struct passwd *pw;
	char *slash;
	int len, baselen;

	if (!path || path[0] != '~')
		return NULL;
	path++;
	slash = strchr(path, '/');
	if (path[0] == '/' || !path[0]) {
		pw = getpwuid(getuid());
	}
	else {
		if (slash) {
			*slash = 0;
			pw = getpwnam(path);
			*slash = '/';
		}
		else
			pw = getpwnam(path);
	}
	if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
		return NULL;
	baselen = strlen(pw->pw_dir);
	memcpy(buf, pw->pw_dir, baselen);
	while ((1 < baselen) && (buf[baselen-1] == '/')) {
		buf[baselen-1] = 0;
		baselen--;
	}
	if (slash && slash[1]) {
		len = strlen(slash);
		if (sz <= baselen + len)
			return NULL;
		memcpy(buf + baselen, slash, len + 1);
	}
	return buf;
}

/*
 * First, one directory to try is determined by the following algorithm.
 *
 * (0) If "strict" is given, the path is used as given and no DWIM is
 *     done. Otherwise:
 * (1) "~/path" to mean path under the running user's home directory;
 * (2) "~user/path" to mean path under named user's home directory;
 * (3) "relative/path" to mean cwd relative directory; or
 * (4) "/absolute/path" to mean absolute directory.
 *
 * Unless "strict" is given, we try access() for existence of "%s.git/.git",
 * "%s/.git", "%s.git", "%s" in this order.  The first one that exists is
 * what we try.
 *
 * Second, we try chdir() to that.  Upon failure, we return NULL.
 *
 * Then, we try if the current directory is a valid git repository.
 * Upon failure, we return NULL.
 *
 * If all goes well, we return the directory we used to chdir() (but
 * before ~user is expanded), avoiding getcwd() resolving symbolic
 * links.  User relative paths are also returned as they are given,
 * except DWIM suffixing.
 */
char *enter_repo(char *path, int strict)
{
	static char used_path[PATH_MAX];
	static char validated_path[PATH_MAX];

	if (!path)
		return NULL;

	if (!strict) {
		static const char *suffix[] = {
			".git/.git", "/.git", ".git", "", NULL,
		};
		int len = strlen(path);
		int i;
		while ((1 < len) && (path[len-1] == '/')) {
			path[len-1] = 0;
			len--;
		}
		if (PATH_MAX <= len)
			return NULL;
		if (path[0] == '~') {
			if (!user_path(used_path, path, PATH_MAX))
				return NULL;
			strcpy(validated_path, path);
			path = used_path;
		}
		else if (PATH_MAX - 10 < len)
			return NULL;
		else {
			path = strcpy(used_path, path);
			strcpy(validated_path, path);
		}
		len = strlen(path);
		for (i = 0; suffix[i]; i++) {
			strcpy(path + len, suffix[i]);
			if (!access(path, F_OK)) {
				strcat(validated_path, suffix[i]);
				break;
			}
		}
		if (!suffix[i] || chdir(path))
			return NULL;
		path = validated_path;
	}
	else if (chdir(path))
		return NULL;

	if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
	    validate_headref("HEAD") == 0) {
		setenv(GIT_DIR_ENVIRONMENT, ".", 1);
		check_repository_format();
		return path;
	}

	return NULL;
}

int adjust_shared_perm(const char *path)
{
	struct stat st;
	int mode;

	if (!shared_repository)
		return 0;
	if (lstat(path, &st) < 0)
		return -1;
	mode = st.st_mode;

	if (shared_repository) {
		int tweak = shared_repository;
		if (!(mode & S_IWUSR))
			tweak &= ~0222;
		mode |= tweak;
	} else {
		/* Preserve old PERM_UMASK behaviour */
		if (mode & S_IWUSR)
			mode |= S_IWGRP;
	}

	if (S_ISDIR(mode)) {
		mode |= FORCE_DIR_SET_GID;

		/* Copy read bits to execute bits */
		mode |= (shared_repository & 0444) >> 2;
	}

	if ((mode & st.st_mode) != mode && chmod(path, mode) < 0)
		return -2;
	return 0;
}

const char *make_relative_path(const char *abs, const char *base)
{
	static char buf[PATH_MAX + 1];
	int baselen;
	if (!base)
		return abs;
	baselen = strlen(base);
	if (prefixcmp(abs, base))
		return abs;
	if (abs[baselen] == '/')
		baselen++;
	else if (base[baselen - 1] != '/')
		return abs;
	strcpy(buf, abs + baselen);
	return buf;
}

/*
 * path = absolute path
 * buf = buffer of at least max(2, strlen(path)+1) bytes
 * It is okay if buf == path, but they should not overlap otherwise.
 *
 * Performs the following normalizations on path, storing the result in buf:
 * - Removes trailing slashes.
 * - Removes empty components.
 * - Removes "." components.
 * - Removes ".." components, and the components the precede them.
 * "" and paths that contain only slashes are normalized to "/".
 * Returns the length of the output.
 *
 * Note that this function is purely textual.  It does not follow symlinks,
 * verify the existence of the path, or make any system calls.
 */
int normalize_absolute_path(char *buf, const char *path)
{
	const char *comp_start = path, *comp_end = path;
	char *dst = buf;
	int comp_len;
	assert(buf);
	assert(path);

	while (*comp_start) {
		assert(*comp_start == '/');
		while (*++comp_end && *comp_end != '/')
			; /* nothing */
		comp_len = comp_end - comp_start;

		if (!strncmp("/",  comp_start, comp_len) ||
		    !strncmp("/.", comp_start, comp_len))
			goto next;

		if (!strncmp("/..", comp_start, comp_len)) {
			while (dst > buf && *--dst != '/')
				; /* nothing */
			goto next;
		}

		memcpy(dst, comp_start, comp_len);
		dst += comp_len;
	next:
		comp_start = comp_end;
	}

	if (dst == buf)
		*dst++ = '/';

	*dst = '\0';
	return dst - buf;
}

/*
 * path = Canonical absolute path
 * prefix_list = Colon-separated list of absolute paths
 *
 * Determines, for each path in prefix_list, whether the "prefix" really
 * is an ancestor directory of path.  Returns the length of the longest
 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
 * is an ancestor.  (Note that this means 0 is returned if prefix_list is
 * "/".) "/foo" is not considered an ancestor of "/foobar".  Directories
 * are not considered to be their own ancestors.  path must be in a
 * canonical form: empty components, or "." or ".." components are not
 * allowed.  prefix_list may be null, which is like "".
 */
int longest_ancestor_length(const char *path, const char *prefix_list)
{
	char buf[PATH_MAX+1];
	const char *ceil, *colon;
	int len, max_len = -1;

	if (prefix_list == NULL || !strcmp(path, "/"))
		return -1;

	for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
		for (colon = ceil; *colon && *colon != ':'; colon++);
		len = colon - ceil;
		if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
			continue;
		strlcpy(buf, ceil, len+1);
		len = normalize_absolute_path(buf, buf);
		/* Strip "trailing slashes" from "/". */
		if (len == 1)
			len = 0;

		if (!strncmp(path, buf, len) &&
		    path[len] == '/' &&
		    len > max_len) {
			max_len = len;
		}
	}

	return max_len;
}
Commit	Line	Data
26c8a533 LT	1	/*
	2	* I'm tired of doing "vsnprintf()" etc just to open a
	3	* file, so here's a "return static buffer with printf"
	4	* interface for paths.
	5	*
	6	* It's obviously not thread-safe. Sue me. But it's quite
	7	* useful for doing things like
	8	*
	9	* f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
	10	*
	11	* which is what it's designed for.
	12	*/
	13	#include "cache.h"
	14
26c8a533 LT	15	static char bad_path[] = "/bad-path/";
26c8a533 LT	16
e7676d2f LT	17	static char *get_pathname(void)
	18	{
	19	static char pathname_array[4][PATH_MAX];
	20	static int index;
	21	return pathname_array[3 & ++index];
	22	}
	23
26c8a533 LT	24	static char cleanup_path(char path)
	25	{
	26	/* Clean it up */
	27	if (!memcmp(path, "./", 2)) {
	28	path += 2;
	29	while (*path == '/')
	30	path++;
	31	}
	32	return path;
	33	}
	34
	35	char mkpath(const char fmt, ...)
	36	{
	37	va_list args;
	38	unsigned len;
e7676d2f	39	char *pathname = get_pathname();
26c8a533 LT	40
	41	va_start(args, fmt);
	42	len = vsnprintf(pathname, PATH_MAX, fmt, args);
	43	va_end(args);
	44	if (len >= PATH_MAX)
	45	return bad_path;
	46	return cleanup_path(pathname);
	47	}
	48
	49	char git_path(const char fmt, ...)
	50	{
5da1606d	51	const char *git_dir = get_git_dir();
e7676d2f	52	char *pathname = get_pathname();
26c8a533 LT	53	va_list args;
	54	unsigned len;
	55
	56	len = strlen(git_dir);
	57	if (len > PATH_MAX-100)
	58	return bad_path;
	59	memcpy(pathname, git_dir, len);
	60	if (len && git_dir[len-1] != '/')
	61	pathname[len++] = '/';
	62	va_start(args, fmt);
	63	len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
	64	va_end(args);
	65	if (len >= PATH_MAX)
	66	return bad_path;
	67	return cleanup_path(pathname);
	68	}
f2db68ed HE	69
	70
	71	/* git_mkstemp() - create tmp file honoring TMPDIR variable */
	72	int git_mkstemp(char path, size_t len, const char template)
	73	{
e7a7be88 JH	74	const char *tmp;
	75	size_t n;
	76
	77	tmp = getenv("TMPDIR");
	78	if (!tmp)
	79	tmp = "/tmp";
	80	n = snprintf(path, len, "%s/%s", tmp, template);
	81	if (len <= n) {
	82	errno = ENAMETOOLONG;
	83	return -1;
35c3c629	84	}
f2db68ed HE	85	return mkstemp(path);
	86	}
	87
	88
c847f537	89	int validate_headref(const char *path)
0870ca7f JH	90	{
	91	struct stat st;
	92	char *buf, buffer[256];
c847f537	93	unsigned char sha1[20];
0104ca09 HO	94	int fd;
0104ca09 HO	95	ssize_t len;
0870ca7f JH	96
	97	if (lstat(path, &st) < 0)
	98	return -1;
	99
	100	/* Make sure it is a "refs/.." symlink */
	101	if (S_ISLNK(st.st_mode)) {
	102	len = readlink(path, buffer, sizeof(buffer)-1);
	103	if (len >= 5 && !memcmp("refs/", buffer, 5))
	104	return 0;
	105	return -1;
	106	}
	107
	108	/*
	109	* Anything else, just open it and try to see if it is a symbolic ref.
	110	*/
	111	fd = open(path, O_RDONLY);
	112	if (fd < 0)
	113	return -1;
93d26e4c	114	len = read_in_full(fd, buffer, sizeof(buffer)-1);
0870ca7f JH	115	close(fd);
	116
	117	/*
	118	* Is it a symbolic ref?
	119	*/
c847f537	120	if (len < 4)
0870ca7f	121	return -1;
c847f537 JH	122	if (!memcmp("ref:", buffer, 4)) {
	123	buf = buffer + 4;
	124	len -= 4;
	125	while (len && isspace(*buf))
	126	buf++, len--;
	127	if (len >= 5 && !memcmp("refs/", buf, 5))
	128	return 0;
	129	}
	130
	131	/*
	132	* Is this a detached HEAD?
	133	*/
	134	if (!get_sha1_hex(buffer, sha1))
0870ca7f	135	return 0;
c847f537	136
0870ca7f JH	137	return -1;
	138	}
	139
d79374c7	140	static char user_path(char buf, char *path, int sz)
54f4b874	141	{
d79374c7 JH	142	struct passwd *pw;
	143	char *slash;
	144	int len, baselen;
54f4b874	145
d79374c7 JH	146	if (!path \|\| path[0] != '~')
	147	return NULL;
	148	path++;
	149	slash = strchr(path, '/');
	150	if (path[0] == '/' \|\| !path[0]) {
	151	pw = getpwuid(getuid());
	152	}
	153	else {
	154	if (slash) {
	155	*slash = 0;
	156	pw = getpwnam(path);
	157	*slash = '/';
54f4b874	158	}
d79374c7 JH	159	else
d79374c7 JH	160	pw = getpwnam(path);
54f4b874	161	}
d79374c7 JH	162	if (!pw \|\| !pw->pw_dir \|\| sz <= strlen(pw->pw_dir))
	163	return NULL;
	164	baselen = strlen(pw->pw_dir);
	165	memcpy(buf, pw->pw_dir, baselen);
	166	while ((1 < baselen) && (buf[baselen-1] == '/')) {
	167	buf[baselen-1] = 0;
	168	baselen--;
	169	}
	170	if (slash && slash[1]) {
	171	len = strlen(slash);
	172	if (sz <= baselen + len)
	173	return NULL;
	174	memcpy(buf + baselen, slash, len + 1);
	175	}
	176	return buf;
54f4b874 AE	177	}
54f4b874 AE	178
d79374c7 JH	179	/*
	180	* First, one directory to try is determined by the following algorithm.
	181	*
	182	* (0) If "strict" is given, the path is used as given and no DWIM is
	183	* done. Otherwise:
	184	* (1) "~/path" to mean path under the running user's home directory;
	185	* (2) "~user/path" to mean path under named user's home directory;
	186	* (3) "relative/path" to mean cwd relative directory; or
	187	* (4) "/absolute/path" to mean absolute directory.
	188	*
	189	* Unless "strict" is given, we try access() for existence of "%s.git/.git",
	190	* "%s/.git", "%s.git", "%s" in this order. The first one that exists is
	191	* what we try.
	192	*
	193	* Second, we try chdir() to that. Upon failure, we return NULL.
	194	*
	195	* Then, we try if the current directory is a valid git repository.
	196	* Upon failure, we return NULL.
	197	*
	198	* If all goes well, we return the directory we used to chdir() (but
	199	* before ~user is expanded), avoiding getcwd() resolving symbolic
	200	* links. User relative paths are also returned as they are given,
	201	* except DWIM suffixing.
	202	*/
54f4b874 AE	203	char enter_repo(char path, int strict)
54f4b874 AE	204	{
d79374c7 JH	205	static char used_path[PATH_MAX];
	206	static char validated_path[PATH_MAX];
	207
	208	if (!path)
54f4b874 AE	209	return NULL;
54f4b874 AE	210
d79374c7 JH	211	if (!strict) {
	212	static const char *suffix[] = {
	213	".git/.git", "/.git", ".git", "", NULL,
	214	};
	215	int len = strlen(path);
	216	int i;
	217	while ((1 < len) && (path[len-1] == '/')) {
	218	path[len-1] = 0;
	219	len--;
	220	}
	221	if (PATH_MAX <= len)
54f4b874	222	return NULL;
d79374c7 JH	223	if (path[0] == '~') {
	224	if (!user_path(used_path, path, PATH_MAX))
	225	return NULL;
	226	strcpy(validated_path, path);
	227	path = used_path;
	228	}
	229	else if (PATH_MAX - 10 < len)
	230	return NULL;
	231	else {
	232	path = strcpy(used_path, path);
	233	strcpy(validated_path, path);
	234	}
	235	len = strlen(path);
	236	for (i = 0; suffix[i]; i++) {
	237	strcpy(path + len, suffix[i]);
	238	if (!access(path, F_OK)) {
	239	strcat(validated_path, suffix[i]);
	240	break;
	241	}
	242	}
	243	if (!suffix[i] \|\| chdir(path))
0870ca7f	244	return NULL;
d79374c7	245	path = validated_path;
0870ca7f	246	}
d79374c7 JH	247	else if (chdir(path))
d79374c7 JH	248	return NULL;
54f4b874	249
d79374c7	250	if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
c847f537	251	validate_headref("HEAD") == 0) {
7627943a	252	setenv(GIT_DIR_ENVIRONMENT, ".", 1);
1644162a	253	check_repository_format();
d79374c7	254	return path;
54f4b874 AE	255	}
	256
	257	return NULL;
	258	}
138086a7 JH	259
	260	int adjust_shared_perm(const char *path)
	261	{
	262	struct stat st;
	263	int mode;
	264
	265	if (!shared_repository)
	266	return 0;
	267	if (lstat(path, &st) < 0)
	268	return -1;
	269	mode = st.st_mode;
06cbe855 HO	270
	271	if (shared_repository) {
	272	int tweak = shared_repository;
	273	if (!(mode & S_IWUSR))
	274	tweak &= ~0222;
8c6202d8	275	mode \|= tweak;
06cbe855 HO	276	} else {
	277	/* Preserve old PERM_UMASK behaviour */
	278	if (mode & S_IWUSR)
	279	mode \|= S_IWGRP;
	280	}
	281
	282	if (S_ISDIR(mode)) {
81a24b52	283	mode \|= FORCE_DIR_SET_GID;
06cbe855 HO	284
	285	/* Copy read bits to execute bits */
	286	mode \|= (shared_repository & 0444) >> 2;
	287	}
	288
fe732ede	289	if ((mode & st.st_mode) != mode && chmod(path, mode) < 0)
138086a7 JH	290	return -2;
	291	return 0;
	292	}
e5392c51	293
044bbbcb LT	294	const char make_relative_path(const char abs, const char *base)
	295	{
	296	static char buf[PATH_MAX + 1];
	297	int baselen;
	298	if (!base)
	299	return abs;
	300	baselen = strlen(base);
	301	if (prefixcmp(abs, base))
	302	return abs;
	303	if (abs[baselen] == '/')
	304	baselen++;
	305	else if (base[baselen - 1] != '/')
	306	return abs;
	307	strcpy(buf, abs + baselen);
	308	return buf;
	309	}
ae299be0 DR	310
	311	/*
	312	* path = absolute path
	313	* buf = buffer of at least max(2, strlen(path)+1) bytes
	314	* It is okay if buf == path, but they should not overlap otherwise.
	315	*
	316	* Performs the following normalizations on path, storing the result in buf:
	317	* - Removes trailing slashes.
	318	* - Removes empty components.
	319	* - Removes "." components.
	320	* - Removes ".." components, and the components the precede them.
	321	* "" and paths that contain only slashes are normalized to "/".
	322	* Returns the length of the output.
	323	*
	324	* Note that this function is purely textual. It does not follow symlinks,
	325	* verify the existence of the path, or make any system calls.
	326	*/
	327	int normalize_absolute_path(char buf, const char path)
	328	{
	329	const char comp_start = path, comp_end = path;
	330	char *dst = buf;
	331	int comp_len;
	332	assert(buf);
	333	assert(path);
	334
	335	while (*comp_start) {
	336	assert(*comp_start == '/');
	337	while (++comp_end && comp_end != '/')
	338	; /* nothing */
	339	comp_len = comp_end - comp_start;
	340
	341	if (!strncmp("/", comp_start, comp_len) \|\|
	342	!strncmp("/.", comp_start, comp_len))
	343	goto next;
	344
	345	if (!strncmp("/..", comp_start, comp_len)) {
	346	while (dst > buf && *--dst != '/')
	347	; /* nothing */
	348	goto next;
	349	}
	350
	351	memcpy(dst, comp_start, comp_len);
	352	dst += comp_len;
	353	next:
	354	comp_start = comp_end;
	355	}
	356
	357	if (dst == buf)
	358	*dst++ = '/';
	359
	360	*dst = '\0';
	361	return dst - buf;
	362	}
0454dd93 DR	363
	364	/*
	365	* path = Canonical absolute path
	366	* prefix_list = Colon-separated list of absolute paths
	367	*
2860b57a	368	* Determines, for each path in prefix_list, whether the "prefix" really
0454dd93 DR	369	* is an ancestor directory of path. Returns the length of the longest
	370	* ancestor directory, excluding any trailing slashes, or -1 if no prefix
	371	* is an ancestor. (Note that this means 0 is returned if prefix_list is
	372	* "/".) "/foo" is not considered an ancestor of "/foobar". Directories
	373	* are not considered to be their own ancestors. path must be in a
	374	* canonical form: empty components, or "." or ".." components are not
	375	* allowed. prefix_list may be null, which is like "".
	376	*/
	377	int longest_ancestor_length(const char path, const char prefix_list)
	378	{
	379	char buf[PATH_MAX+1];
	380	const char ceil, colon;
	381	int len, max_len = -1;
	382
	383	if (prefix_list == NULL \|\| !strcmp(path, "/"))
	384	return -1;
	385
	386	for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
	387	for (colon = ceil; colon && colon != ':'; colon++);
	388	len = colon - ceil;
	389	if (len == 0 \|\| len > PATH_MAX \|\| !is_absolute_path(ceil))
	390	continue;
	391	strlcpy(buf, ceil, len+1);
	392	len = normalize_absolute_path(buf, buf);
	393	/* Strip "trailing slashes" from "/". */
	394	if (len == 1)
	395	len = 0;
	396
	397	if (!strncmp(path, buf, len) &&
	398	path[len] == '/' &&
	399	len > max_len) {
	400	max_len = len;
	401	}
	402	}
	403
	404	return max_len;
	405	}