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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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/*
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* readdir_r -- C library extension routine
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*/
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#include <sys/feature_tests.h>
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#if !defined(_LP64)
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#pragma weak readdir64_r = _readdir64_r
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#endif
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#pragma weak readdir_r = _readdir_r
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#include "synonyms.h"
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#include <mtlib.h>
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#include <sys/types.h>
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#include <sys/dirent.h>
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#include <dirent.h>
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#include <thread.h>
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#include <string.h>
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#include <synch.h>
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#include <stdio.h>
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#include <limits.h>
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#include <errno.h>
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#include "libc.h"
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extern mutex_t _dirent_lock;
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#define LBUFSIZE (sizeof (struct dirent64) + _POSIX_PATH_MAX + 1)
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#ifdef _LP64
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/*
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* POSIX.1c standard version of the thread function readdir_r.
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*/
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int
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readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
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{
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struct dirent *dp; /* -> directory data */
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int saveloc = 0;
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lmutex_lock(&_dirent_lock);
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if (dirp->dd_size != 0) {
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dp = (struct dirent *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc];
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saveloc = dirp->dd_loc; /* save for possible EOF */
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dirp->dd_loc += (int)dp->d_reclen;
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}
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if (dirp->dd_loc >= dirp->dd_size)
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dirp->dd_loc = dirp->dd_size = 0;
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if (dirp->dd_size == 0 && /* refill buffer */
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(dirp->dd_size = getdents(dirp->dd_fd,
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(struct dirent *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) {
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if (dirp->dd_size == 0) { /* This means EOF */
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dirp->dd_loc = saveloc; /* EOF so save for telldir */
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lmutex_unlock(&_dirent_lock);
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*result = NULL;
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return (0); /* EOF */
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}
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lmutex_unlock(&_dirent_lock);
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*result = NULL;
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return (errno); /* error */
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}
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dp = (struct dirent *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc];
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(void) memcpy(entry, dp, (size_t)dp->d_reclen);
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lmutex_unlock(&_dirent_lock);
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*result = entry;
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return (0);
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}
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#else /* _LP64 */
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/*
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* POSIX.1c standard version of the thr function readdir_r.
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* Large file version.
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*/
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int
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readdir64_r(DIR *dirp, struct dirent64 *entry, struct dirent64 **result)
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{
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struct dirent64 *dp64; /* -> directory data */
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int saveloc = 0;
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lmutex_lock(&_dirent_lock);
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if (dirp->dd_size != 0) {
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dp64 = (struct dirent64 *)
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(uintptr_t)&dirp->dd_buf[dirp->dd_loc];
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/* was converted by readdir and needs to be reversed */
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if (dp64->d_ino == (ino64_t)-1) {
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struct dirent *dp32; /* -> 32 bit directory data */
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dp32 = (struct dirent *)(&dp64->d_off);
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dp64->d_ino = (ino64_t)dp32->d_ino;
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dp64->d_off = (off64_t)dp32->d_off;
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dp64->d_reclen = (unsigned short)(dp32->d_reclen +
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((char *)&dp64->d_off - (char *)dp64));
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}
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saveloc = dirp->dd_loc; /* save for possible EOF */
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dirp->dd_loc += (int)dp64->d_reclen;
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}
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if (dirp->dd_loc >= dirp->dd_size)
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dirp->dd_loc = dirp->dd_size = 0;
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if (dirp->dd_size == 0 && /* refill buffer */
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(dirp->dd_size = getdents64(dirp->dd_fd,
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(struct dirent64 *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) {
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if (dirp->dd_size == 0) { /* This means EOF */
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dirp->dd_loc = saveloc; /* EOF so save for telldir */
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lmutex_unlock(&_dirent_lock);
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*result = NULL;
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return (0); /* EOF */
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}
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lmutex_unlock(&_dirent_lock);
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*result = NULL;
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return (errno); /* error */
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}
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dp64 = (struct dirent64 *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc];
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(void) memcpy(entry, dp64, (size_t)dp64->d_reclen);
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*result = entry;
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lmutex_unlock(&_dirent_lock);
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return (0);
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}
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/*
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* POSIX.1c Draft-6 version of the function readdir_r.
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* It was implemented by Solaris 2.3.
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*/
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struct dirent *
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readdir_r(DIR *dirp, struct dirent *entry)
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{
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long buf[LBUFSIZE / sizeof (long) + 1];
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struct dirent64 *dp64;
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if (readdir64_r(dirp, (struct dirent64 *)(uintptr_t)buf, &dp64) != 0 ||
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dp64 == NULL)
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return (NULL);
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if ((dp64->d_ino > SIZE_MAX) || ((uint64_t)dp64->d_off >
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(uint64_t)UINT32_MAX)) {
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errno = EOVERFLOW;
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return (NULL);
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}
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entry->d_ino = (ino_t)dp64->d_ino;
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entry->d_off = (off_t)dp64->d_off;
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entry->d_reclen = (unsigned short)((((char *)entry->d_name -
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(char *)entry) + strlen(dp64->d_name) + 1 + 3) & ~3);
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(void) strcpy(entry->d_name, dp64->d_name);
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return (entry);
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}
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/*
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* POSIX.1c standard version of the thr function readdir_r.
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* User gets it via static readdir_r from header file.
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*/
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int
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__posix_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
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{
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long buf[LBUFSIZE / sizeof (long) + 1];
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struct dirent64 *dp64;
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int ret;
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ret = readdir64_r(dirp, (struct dirent64 *)(uintptr_t)buf, &dp64);
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if (ret != 0 || dp64 == NULL) {
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*result = NULL;
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return (ret);
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}
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if ((dp64->d_ino > SIZE_MAX) || ((uint64_t)dp64->d_off >
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(uint64_t)UINT32_MAX)) {
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*result = NULL;
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return (EOVERFLOW);
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}
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entry->d_ino = (ino_t)dp64->d_ino;
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entry->d_off = (off_t)dp64->d_off;
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entry->d_reclen = (unsigned short)((((char *)entry->d_name -
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(char *)entry) + strlen(dp64->d_name) + 1 + 3) & ~3);
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(void) strcpy(entry->d_name, dp64->d_name);
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*result = entry;
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return (0);
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}
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#endif /* _LP64 */
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