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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	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
	38	__FBSDID("$FreeBSD: src/lib/libc/gen/readdir.c,v 1.11 2002/02/26 21:39:32 alfred Exp $");
	39
	40	#include "namespace.h"
	41	#include <sys/param.h>
	42	#include <dirent.h>
	43	#include <errno.h>
	44	#include <string.h>
	45	#include <pthread.h>
	46	#include "un-namespace.h"
	47
	48	#include "libc_private.h"
	49
	50	/*
	51	* get next entry in a directory.
	52	*/
	53	struct dirent *
	54	_readdir_unlocked(dirp)
	55	DIR *dirp;
	56	{
	57	struct dirent *dp;
	58
	59	for (;;) {
	60	if (dirp->dd_loc >= dirp->dd_size) {
	61	if (dirp->dd_flags & __DTF_READALL)
	62	return (NULL);
	63	dirp->dd_loc = 0;
	64	}
	65	if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
	66	dirp->dd_size = _getdirentries(dirp->dd_fd,
	67	dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
	68	if (dirp->dd_size <= 0)
	69	return (NULL);
	70	}
	71	dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
	72	if ((long)dp & 03L) /* bogus pointer check */
	73	return (NULL);
	74	if (dp->d_reclen <= 0 \|\|
	75	dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
	76	return (NULL);
	77	dirp->dd_loc += dp->d_reclen;
	78	if (dp->d_ino == 0)
	79	continue;
	80	if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
	81	continue;
	82	return (dp);
	83	}
	84	}
	85
	86	struct dirent *
	87	readdir(dirp)
	88	DIR *dirp;
	89	{
	90	struct dirent *dp;
	91
	92	if (__isthreaded) {
	93	_pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
	94	dp = _readdir_unlocked(dirp);
	95	_pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
	96	}
	97	else
	98	dp = _readdir_unlocked(dirp);
	99	return (dp);
	100	}
	101
	102	int
	103	readdir_r(dirp, entry, result)
	104	DIR *dirp;
	105	struct dirent *entry;
	106	struct dirent **result;
	107	{
	108	struct dirent *dp;
	109	int saved_errno;
	110
	111	saved_errno = errno;
	112	errno = 0;
	113	if (__isthreaded) {
	114	_pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
	115	if ((dp = _readdir_unlocked(dirp)) != NULL)
	116	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	117	_pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
	118	}
	119	else if ((dp = _readdir_unlocked(dirp)) != NULL)
	120	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	121
	122	if (errno != 0) {
	123	if (dp == NULL)
	124	return (errno);
	125	} else
	126	errno = saved_errno;
	127
	128	if (dp != NULL)
	129	*result = entry;
	130	else
	131	*result = NULL;
	132
	133	return (0);
	134	}