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 * 3. 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 * From: @(#)readdir.c 8.3 (Berkeley) 9/29/94
30 * From: FreeBSD: head/lib/libc/gen/readdir.c 314436 2017-02-28 23:42:47Z imp
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include "namespace.h"
37 #include <sys/param.h>
38 #define _WANT_FREEBSD11_DIRENT
39 #include <dirent.h>
40 #include <errno.h>
41 #include <stdbool.h>
42 #include <stddef.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <pthread.h>
46 #include "un-namespace.h"
47
48 #include "libc_private.h"
49 #include "gen-private.h"
50 #include "telldir.h"
51
52 #include "gen-compat.h"
53
54 static bool
freebsd11_cvtdirent(struct freebsd11_dirent * dstdp,struct dirent * srcdp)55 freebsd11_cvtdirent(struct freebsd11_dirent *dstdp, struct dirent *srcdp)
56 {
57
58 if (srcdp->d_namlen >= sizeof(dstdp->d_name))
59 return (false);
60 dstdp->d_type = srcdp->d_type;
61 dstdp->d_namlen = srcdp->d_namlen;
62 dstdp->d_fileno = srcdp->d_fileno; /* truncate */
63 dstdp->d_reclen = FREEBSD11_DIRSIZ(dstdp);
64 bcopy(srcdp->d_name, dstdp->d_name, dstdp->d_namlen);
65 bzero(dstdp->d_name + dstdp->d_namlen,
66 dstdp->d_reclen - offsetof(struct freebsd11_dirent, d_name) -
67 dstdp->d_namlen);
68 return (true);
69 }
70
71 struct freebsd11_dirent *
freebsd11_readdir(DIR * dirp)72 freebsd11_readdir(DIR *dirp)
73 {
74 struct freebsd11_dirent *dstdp;
75 struct dirent *dp;
76
77 if (__isthreaded)
78 _pthread_mutex_lock(&dirp->dd_lock);
79 dp = _readdir_unlocked(dirp, RDU_SKIP);
80 if (dp != NULL) {
81 if (dirp->dd_compat_de == NULL)
82 dirp->dd_compat_de = malloc(sizeof(struct
83 freebsd11_dirent));
84 if (freebsd11_cvtdirent(dirp->dd_compat_de, dp))
85 dstdp = dirp->dd_compat_de;
86 else
87 dstdp = NULL;
88 } else
89 dstdp = NULL;
90 if (__isthreaded)
91 _pthread_mutex_unlock(&dirp->dd_lock);
92
93 return (dstdp);
94 }
95
96 int
freebsd11_readdir_r(DIR * dirp,struct freebsd11_dirent * entry,struct freebsd11_dirent ** result)97 freebsd11_readdir_r(DIR *dirp, struct freebsd11_dirent *entry,
98 struct freebsd11_dirent **result)
99 {
100 struct dirent xentry, *xresult;
101 int error;
102
103 error = __readdir_r(dirp, &xentry, &xresult);
104 if (error != 0)
105 return (error);
106 if (xresult != NULL) {
107 if (freebsd11_cvtdirent(entry, &xentry))
108 *result = entry;
109 else /* should not happen due to RDU_SHORT */
110 *result = NULL;
111 } else
112 *result = NULL;
113 return (0);
114 }
115
116 __sym_compat(readdir, freebsd11_readdir, FBSD_1.0);
117 __sym_compat(readdir_r, freebsd11_readdir_r, FBSD_1.0);
118