FreeNOS
fopen.cpp
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1/*
2 * Copyright (C) 2009 Niek Linnenbank
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <fcntl.h>
19#include <sys/types.h>
20#include "stdio.h"
21#include "stdlib.h"
22#include "errno.h"
23
24FILE * fopen(const char *filename,
25 const char *mode)
26{
27 FILE *f;
28
29 // Handle the file stream request
30 switch (*mode)
31 {
32 // Read
33 case 'r':
34 f = (FILE *) malloc(sizeof(FILE));
35 f->fd = open(filename, ZERO);
36 return f;
37
38 // Unsupported
39 default:
40 break;
41 }
42
43 // Sorry, not available yet!
44 errno = ENOTSUP;
45 return (FILE *) NULL;
46}
C int open(const char *path, int oflag,...)
Open file relative to directory file descriptor.
Definition open.cpp:26
C int errno
The lvalue errno is used by many functions to return error values.
#define ENOTSUP
Not supported (may be the same value as [EOPNOTSUPP]).
Definition errno.h:226
C void * malloc(size_t size)
A memory allocator.
Definition malloc.cpp:22
FILE * fopen(const char *filename, const char *mode)
Open a stream.
Definition fopen.cpp:24
#define NULL
NULL means zero.
Definition Macros.h:39
#define ZERO
Zero value.
Definition Macros.h:43
A structure containing information about a file.
Definition stdio.h:61
int fd
File descriptor.
Definition stdio.h:63