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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40 /*LINTLIBRARY*/
41
42 /*
43 * readdir -- C library extension routine
44 */
45
46 #include <sys/types.h>
47 #include <sys/dir.h>
48 #include <sys/dirent.h>
49 #include <limits.h>
50 #include <string.h>
51 #include <errno.h>
52 #include "libc.h"
53
54 static struct direct dc;
55 static struct direct64 dc64;
56
57 static struct direct64 *
internal_readdir(DIR * dirp)58 internal_readdir(DIR *dirp)
59 {
60 struct dirent64 *dp; /* -> directory data */
61 int saveloc = 0;
62
63 if (dirp->dd_size != 0) {
64 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc];
65 saveloc = dirp->dd_loc; /* save for possible EOF */
66 dirp->dd_loc += dp->d_reclen;
67 }
68 if (dirp->dd_loc >= dirp->dd_size)
69 dirp->dd_loc = dirp->dd_size = 0;
70
71 if (dirp->dd_size == 0 && /* refill buffer */
72 (dirp->dd_size = getdents64(dirp->dd_fd,
73 (struct dirent64 *)dirp->dd_buf, DIRBUF)) <= 0) {
74 if (dirp->dd_size == 0) /* This means EOF */
75 dirp->dd_loc = saveloc; /* EOF so save for telldir */
76 return (NULL); /* error or EOF */
77 }
78
79 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc];
80
81 /* Copy dirent into direct */
82 dc64.d_ino = dp->d_ino;
83 dc64.d_reclen = dp->d_reclen;
84 dc64.d_namlen = (ushort_t)strlen(dp->d_name);
85 if (dc64.d_namlen > MAXNAMLEN) {
86 errno = ENAMETOOLONG;
87 return (NULL);
88 }
89 (void) strcpy(dc64.d_name, dp->d_name);
90
91 return (&dc64);
92 }
93
94 struct direct *
readdir(DIR * dirp)95 readdir(DIR *dirp)
96 {
97 if (internal_readdir(dirp) == NULL)
98 return (NULL);
99
100 /* Check for overflows */
101 if (dc64.d_ino > SIZE_MAX) {
102 errno = EOVERFLOW;
103 return (NULL);
104 }
105
106 /* Copy dirent into direct */
107 dc.d_ino = dc64.d_ino;
108 dc.d_reclen = dc64.d_reclen - 4;
109 dc.d_namlen = dc64.d_namlen;
110 (void) strcpy(dc.d_name, dc64.d_name);
111
112 return (&dc);
113 }
114
115 #if !defined(_LP64)
116 struct direct64 *
readdir64(DIR * dirp)117 readdir64(DIR *dirp)
118 {
119 return (internal_readdir(dirp));
120 }
121 #endif
122