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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1983, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
	34	__FBSDID("$FreeBSD: src/lib/libc/gen/readdir.c,v 1.15 2008/05/05 14:05:23 kib Exp $");
	35
	36	#include "namespace.h"
	37	#include <sys/param.h>
	38	#include <dirent.h>
	39	#include <errno.h>
	40	#include <string.h>
	41	#include <pthread.h>
	42	#include <unistd.h>
	43	#include "un-namespace.h"
	44
	45	#include "libc_private.h"
	46	#include "telldir.h"
	47
	48	/*
	49	* get next entry in a directory.
	50	*/
	51	struct dirent *
	52	_readdir_unlocked(dirp, skip)
	53	DIR *dirp;
	54	int skip;
	55	{
	56	struct dirent *dp;
	57
	58	for (;;) {
	59	if (dirp->dd_loc >= dirp->dd_size) {
	60	if (dirp->dd_flags & __DTF_READALL)
	61	return (NULL);
	62	dirp->dd_loc = 0;
	63	}
	64	if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
	65	#if __DARWIN_64_BIT_INO_T
	66	dirp->dd_size = __getdirentries64(dirp->dd_fd,
	67	dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff);
	68	#else /* !__DARWIN_64_BIT_INO_T */
	69	dirp->dd_size = _getdirentries(dirp->dd_fd,
	70	dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
	71	#endif /* __DARWIN_64_BIT_INO_T */
	72	if (dirp->dd_size <= 0)
	73	return (NULL);
	74	}
	75	dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
	76	if ((long)dp & 03L) /* bogus pointer check */
	77	return (NULL);
	78	if (dp->d_reclen <= 0 \|\|
	79	dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
	80	return (NULL);
	81	dirp->dd_loc += dp->d_reclen;
	82	if (dp->d_ino == 0 && skip)
	83	continue;
	84	if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
	85	continue;
	86	return (dp);
	87	}
	88	}
	89
	90	struct dirent *
	91	readdir(dirp)
	92	DIR *dirp;
	93	{
	94	struct dirent *dp;
	95
	96	if (__isthreaded) {
	97	_pthread_mutex_lock(&dirp->dd_lock);
	98	dp = _readdir_unlocked(dirp, 1);
	99	_pthread_mutex_unlock(&dirp->dd_lock);
	100	}
	101	else
	102	dp = _readdir_unlocked(dirp, 1);
	103	return (dp);
	104	}
	105
	106	int
	107	readdir_r(dirp, entry, result)
	108	DIR *dirp;
	109	struct dirent *entry;
	110	struct dirent **result;
	111	{
	112	struct dirent *dp;
	113	int saved_errno;
	114
	115	saved_errno = errno;
	116	errno = 0;
	117	if (__isthreaded) {
	118	_pthread_mutex_lock(&dirp->dd_lock);
	119	if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
	120	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	121	_pthread_mutex_unlock(&dirp->dd_lock);
	122	}
	123	else if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
	124	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	125
	126	if (errno != 0) {
	127	if (dp == NULL)
	128	return (errno);
	129	} else
	130	errno = saved_errno;
	131
	132	if (dp != NULL)
	133	*result = entry;
	134	else
	135	*result = NULL;
	136
	137	return (0);
	138	}