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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/****************************************************************************
* lib/stdio/lib_fopen.c
*
* Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "lib_internal.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lib_mode2oflags
****************************************************************************/
static int lib_mode2oflags(FAR const char *mode)
{
int oflags = 0;
if (mode)
{
while(*mode)
{
switch (*mode)
{
/* Open for read access */
case 'r' :
if (*(mode + 1) == '+')
{
/* Open for read/write access */
oflags |= O_RDWR;
mode++;
}
else
{
/* Open for read access */
oflags |= O_RDOK;
}
break;
/* Open for write access? */
case 'w' :
if (*(mode + 1) == '+')
{
/* Open for write read/access, truncating any existing file */
oflags |= O_RDWR|O_CREAT|O_TRUNC;
mode++;
}
else
{
/* Open for write access, truncating any existing file */
oflags |= O_WROK|O_CREAT|O_TRUNC;
}
break;
/* Open for write/append access? */
case 'a' :
if (*(mode + 1) == '+')
{
/* Read from the beginning of the file; write to the end */
oflags |= O_RDWR|O_CREAT;
mode++;
}
else
{
/* Write to the end of the file */
oflags |= O_WROK|O_CREAT;
}
break;
/* Open for binary access? */
case 'b' :
default:
break;
}
mode++;
}
}
return oflags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: fdopen
****************************************************************************/
FAR FILE *fdopen(int fd, FAR const char *mode)
{
return fs_fdopen(fd, lib_mode2oflags(mode), NULL);
}
/****************************************************************************
* Name: fopen
****************************************************************************/
FAR FILE *fopen(FAR const char *path, FAR const char *mode)
{
FAR FILE *ret = NULL;
int oflags;
int fd;
/* Open the file */
oflags = lib_mode2oflags(mode);
fd = open(path, oflags, 0666);
/* If the open was successful, then fdopen() the fil using the file
* desciptor returned by open. If open failed, then just return the
* NULL stream -- open() has already set the errno.
*/
if (fd >= 0)
{
ret = fs_fdopen(fd, oflags, NULL);
if (!ret)
{
/* Don't forget to close the file descriptor if any other
* failures are reported by fdopen().
*/
(void)close(fd);
}
}
return ret;
}
|
