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