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1 /* $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp $ */
2 /*
3  * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
26 
27 #if !defined(_POSIX_C_SOURCE)
28 #define _POSIX_C_SOURCE 201409  /* for readdir_r */
29 #endif
30 
31 #include "directory.h"
32 
33 
34 #if !defined(OPENSSL_WINDOWS)
35 
36 #include <dirent.h>
37 #include <errno.h>
38 #include <stdlib.h>
39 #include <string.h>
40 
41 #if defined(OPENSSL_PNACL)
42 /* pnacl doesn't include readdir_r! So we do the best we can. */
readdir_r(DIR * dirp,struct dirent * entry,struct dirent ** result)43 int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result) {
44   errno = 0;
45   *result = readdir(dirp);
46   if (*result != NULL) {
47     return 0;
48   }
49   if (errno) {
50     return 1;
51   }
52   return 0;
53 }
54 #endif
55 
56 struct OPENSSL_dir_context_st {
57   DIR *dir;
58   struct dirent dirent;
59 };
60 
OPENSSL_DIR_read(OPENSSL_DIR_CTX ** ctx,const char * directory)61 const char *OPENSSL_DIR_read(OPENSSL_DIR_CTX **ctx, const char *directory) {
62   struct dirent *dirent;
63 
64   if (ctx == NULL || directory == NULL) {
65     errno = EINVAL;
66     return NULL;
67   }
68 
69   errno = 0;
70   if (*ctx == NULL) {
71     *ctx = malloc(sizeof(OPENSSL_DIR_CTX));
72     if (*ctx == NULL) {
73       errno = ENOMEM;
74       return 0;
75     }
76     memset(*ctx, 0, sizeof(OPENSSL_DIR_CTX));
77 
78     (*ctx)->dir = opendir(directory);
79     if ((*ctx)->dir == NULL) {
80       int save_errno = errno; /* Probably not needed, but I'm paranoid */
81       free(*ctx);
82       *ctx = NULL;
83       errno = save_errno;
84       return 0;
85     }
86   }
87 
88   if (readdir_r((*ctx)->dir, &(*ctx)->dirent, &dirent) != 0 ||
89       dirent == NULL) {
90     return 0;
91   }
92 
93   return (*ctx)->dirent.d_name;
94 }
95 
OPENSSL_DIR_end(OPENSSL_DIR_CTX ** ctx)96 int OPENSSL_DIR_end(OPENSSL_DIR_CTX **ctx) {
97   if (ctx != NULL && *ctx != NULL) {
98     int r = closedir((*ctx)->dir);
99     free(*ctx);
100     *ctx = NULL;
101     return r == 0;
102   }
103 
104   errno = EINVAL;
105   return 0;
106 }
107 
108 #endif  /* !OPENSSL_WINDOWS */
109