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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("$FreeBSD$");
	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 "un-namespace.h"
	43
	44	#include "libc_private.h"
	45	#include "telldir.h"
	46
	47	/*
	48	* get next entry in a directory.
	49	*/
	50	struct dirent *
	51	_readdir_unlocked(DIR *dirp, int skip)
	52	{
	53	struct dirent *dp;
	54	long initial_seek;
	55	long initial_loc = 0;
	56
	57	for (;;) {
	58	if (dirp->dd_loc >= dirp->dd_size) {
	59	if (dirp->dd_flags & __DTF_READALL)
	60	return (NULL);
	61	initial_loc = dirp->dd_loc;
	62	dirp->dd_flags &= ~__DTF_SKIPREAD;
	63	dirp->dd_loc = 0;
	64	}
	65	if (dirp->dd_loc == 0 &&
	66	!(dirp->dd_flags & (__DTF_READALL \| __DTF_SKIPREAD))) {
	67	#if __DARWIN_64_BIT_INO_T
	68	initial_seek = dirp->dd_td->seekoff;
	69	dirp->dd_size = (long)__getdirentries64(dirp->dd_fd,
	70	dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff);
	71	#else /* !__DARWIN_64_BIT_INO_T */
	72	initial_seek = dirp->dd_seek;
	73	dirp->dd_size = _getdirentries(dirp->dd_fd,
	74	dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
	75	#endif /* __DARWIN_64_BIT_INO_T */
	76	if (dirp->dd_size <= 0)
	77	return (NULL);
	78	_fixtelldir(dirp, initial_seek, initial_loc);
	79	}
	80	dirp->dd_flags &= ~__DTF_SKIPREAD;
	81	dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
	82	if ((long)dp & 03L) /* bogus pointer check */
	83	return (NULL);
	84	if (dp->d_reclen <= 0 \|\|
	85	dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
	86	return (NULL);
	87	dirp->dd_loc += dp->d_reclen;
	88	if (dp->d_ino == 0 && skip)
	89	continue;
	90	if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
	91	continue;
	92	return (dp);
	93	}
	94	}
	95
	96	struct dirent *
	97	readdir(DIR *dirp)
	98	{
	99	struct dirent *dp;
	100
	101	if (__isthreaded) {
	102	_pthread_mutex_lock(&dirp->dd_lock);
	103	dp = _readdir_unlocked(dirp, 1);
	104	_pthread_mutex_unlock(&dirp->dd_lock);
	105	}
	106	else
	107	dp = _readdir_unlocked(dirp, 1);
	108	return (dp);
	109	}
	110
	111	int
	112	readdir_r(DIR dirp, struct dirent entry, struct dirent **result)
	113	{
	114	struct dirent *dp;
	115	int saved_errno;
	116
	117	saved_errno = errno;
	118	errno = 0;
	119	if (__isthreaded) {
	120	_pthread_mutex_lock(&dirp->dd_lock);
	121	if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
	122	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	123	_pthread_mutex_unlock(&dirp->dd_lock);
	124	}
	125	else if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
	126	memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
	127
	128	if (errno != 0) {
	129	if (dp == NULL)
	130	return (errno);
	131	} else
	132	errno = saved_errno;
	133
	134	if (dp != NULL)
	135	*result = entry;
	136	else
	137	*result = NULL;
	138
	139	return (0);
	140	}