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