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 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 /*LINTLIBRARY*/
43
44 /*
45 * readdir -- C library extension routine
46 */
47
48 #include <sys/types.h>
49 #include <sys/dir.h>
50 #include <sys/dirent.h>
51 #include <limits.h>
52 #include <string.h>
53 #include <errno.h>
54 #include "libc.h"
55
56 static struct direct dc;
57 static struct direct64 dc64;
58
59 static struct direct64 *
internal_readdir(DIR * dirp)60 internal_readdir(DIR *dirp)
61 {
62 struct dirent64 *dp; /* -> directory data */
63 int saveloc = 0;
64
65 if (dirp->dd_size != 0) {
66 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc];
67 saveloc = dirp->dd_loc; /* save for possible EOF */
68 dirp->dd_loc += dp->d_reclen;
69 }
70 if (dirp->dd_loc >= dirp->dd_size)
71 dirp->dd_loc = dirp->dd_size = 0;
72
73 if (dirp->dd_size == 0 && /* refill buffer */
74 (dirp->dd_size = getdents64(dirp->dd_fd,
75 (struct dirent64 *)dirp->dd_buf, DIRBUF)) <= 0) {
76 if (dirp->dd_size == 0) /* This means EOF */
77 dirp->dd_loc = saveloc; /* EOF so save for telldir */
78 return (NULL); /* error or EOF */
79 }
80
81 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc];
82
83 /* Copy dirent into direct */
84 dc64.d_ino = dp->d_ino;
85 dc64.d_reclen = dp->d_reclen;
86 dc64.d_namlen = (ushort_t)strlen(dp->d_name);
87 if (dc64.d_namlen > MAXNAMLEN) {
88 errno = ENAMETOOLONG;
89 return (NULL);
90 }
91 (void) strcpy(dc64.d_name, dp->d_name);
92
93 return (&dc64);
94 }
95
96 struct direct *
readdir(DIR * dirp)97 readdir(DIR *dirp)
98 {
99 if (internal_readdir(dirp) == NULL)
100 return (NULL);
101
102 /* Check for overflows */
103 if (dc64.d_ino > SIZE_MAX) {
104 errno = EOVERFLOW;
105 return (NULL);
106 }
107
108 /* Copy dirent into direct */
109 dc.d_ino = dc64.d_ino;
110 dc.d_reclen = dc64.d_reclen - 4;
111 dc.d_namlen = dc64.d_namlen;
112 (void) strcpy(dc.d_name, dc64.d_name);
113
114 return (&dc);
115 }
116
117 #if !defined(_LP64)
118 struct direct64 *
readdir64(DIR * dirp)119 readdir64(DIR *dirp)
120 {
121 return (internal_readdir(dirp));
122 }
123 #endif
124