1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 * telldir -- C library extension routine
34 */
35
36#include <sys/isa_defs.h>
37
38#if !defined(_LP64)
39#pragma weak _telldir64 = telldir64
40#endif
41#pragma weak _telldir = telldir
42
43#include "lint.h"
44#include "libc.h"
45#include <mtlib.h>
46#include <dirent.h>
47#include <errno.h>
48#include <limits.h>
49#include <fcntl.h>
50#include <unistd.h>
51
52#ifdef _LP64
53
54long
55telldir(DIR *dirp)
56{
57	private_DIR	*pdirp = (private_DIR *)dirp;
58	dirent_t	*dp;
59	off_t		off = 0;
60
61	lmutex_lock(&pdirp->dd_lock);
62	/* if at beginning of dir, return 0 */
63	if (lseek(dirp->dd_fd, 0, SEEK_CUR) != 0) {
64		dp = (dirent_t *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);
65		off = dp->d_off;
66	}
67	lmutex_unlock(&pdirp->dd_lock);
68	return (off);
69}
70
71#else
72
73/*
74 * Note: Instead of making this function static, we reduce it to local
75 * scope in the mapfile. That allows the linker to prevent it from
76 * appearing in the .SUNW_dynsymsort section.
77 */
78off64_t
79telldir64(DIR *dirp)
80{
81	private_DIR	*pdirp = (private_DIR *)(uintptr_t)dirp;
82	dirent64_t	*dp64;
83	off64_t		off = 0;
84
85	lmutex_lock(&pdirp->dd_lock);
86	/* if at beginning of dir, return 0 */
87	if (lseek64(dirp->dd_fd, 0, SEEK_CUR) != 0) {
88		dp64 = (dirent64_t *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);
89		/* was converted by readdir and needs to be reversed */
90		if (dp64->d_ino == (ino64_t)-1) {
91			dirent_t *dp32;
92
93			dp32 = (dirent_t *)((uintptr_t)dp64 + sizeof (ino64_t));
94			dp64->d_ino = (ino64_t)dp32->d_ino;
95			dp64->d_off = (off64_t)dp32->d_off;
96			dp64->d_reclen = (unsigned short)(dp32->d_reclen +
97			    ((char *)&dp64->d_off - (char *)dp64));
98		}
99		off = dp64->d_off;
100	}
101	lmutex_unlock(&pdirp->dd_lock);
102	return (off);
103}
104
105long
106telldir(DIR *dirp)
107{
108	off64_t off;
109
110	off = telldir64(dirp);
111
112	/*
113	 * Make sure that the offset fits in 32 bits.
114	 */
115	if ((long)off != off && (uint64_t)off > (uint64_t)UINT32_MAX) {
116		errno = EOVERFLOW;
117		return (-1);
118	}
119	return ((long)off);
120}
121
122#endif	/* _LP64 */
123