1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* This file is dual-licensed and is also available under the following
* terms:
*
* Copyright (c) 2004, Richard Levitte <richard@levitte.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#ifndef LPDIR_H
# include "LPdir.h"
#endif
/*
* The POSIXly macro for the maximum number of characters in a file path is
* NAME_MAX. However, some operating systems use PATH_MAX instead.
* Therefore, it seems natural to first check for PATH_MAX and use that, and
* if it doesn't exist, use NAME_MAX.
*/
#if defined(PATH_MAX)
# define LP_ENTRY_SIZE PATH_MAX
#elif defined(NAME_MAX)
# define LP_ENTRY_SIZE NAME_MAX
#endif
/*
* Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
* exist. It's also possible that NAME_MAX exists but is define to a very
* small value (HP-UX offers 14), so we need to check if we got a result, and
* if it meets a minimum standard, and create or change it if not.
*/
#if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
# undef LP_ENTRY_SIZE
# define LP_ENTRY_SIZE 255
#endif
struct LP_dir_context_st {
DIR *dir;
char entry_name[LP_ENTRY_SIZE + 1];
};
const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
{
struct dirent *direntry = NULL;
if (ctx == NULL || directory == NULL) {
errno = EINVAL;
return 0;
}
errno = 0;
if (*ctx == NULL) {
*ctx = malloc(sizeof(**ctx));
if (*ctx == NULL) {
errno = ENOMEM;
return 0;
}
memset(*ctx, 0, sizeof(**ctx));
(*ctx)->dir = opendir(directory);
if ((*ctx)->dir == NULL) {
int save_errno = errno; /* Probably not needed, but I'm paranoid */
free(*ctx);
*ctx = NULL;
errno = save_errno;
return 0;
}
}
direntry = readdir((*ctx)->dir);
if (direntry == NULL) {
return 0;
}
strncpy((*ctx)->entry_name, direntry->d_name,
sizeof((*ctx)->entry_name) - 1);
(*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
return (*ctx)->entry_name;
}
int LP_find_file_end(LP_DIR_CTX **ctx)
{
if (ctx != NULL && *ctx != NULL) {
int ret = closedir((*ctx)->dir);
free(*ctx);
switch (ret) {
case 0:
return 1;
case -1:
return 0;
default:
break;
}
}
errno = EINVAL;
return 0;
}
|
