1/*	$OpenBSD: fopen.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */
2/*-
3 * Copyright (c) 1990, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/types.h>
35#include <sys/stat.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <errno.h>
39#include "local.h"
40#include <linux/stat.h>
41
42FILE *
43fopen(const char *file, const char *mode)
44{
45	FILE *fp;
46	int f;
47	int flags, oflags;
48
49	if ((flags = __sflags(mode, &oflags)) == 0)
50		return (NULL);
51	if ((fp = __sfp()) == NULL)
52		return (NULL);
53	if ((f = open(file, oflags, DEFFILEMODE)) < 0) {
54		fp->_flags = 0;			/* release */
55		return (NULL);
56	}
57	fp->_file = f;
58	fp->_flags = flags;
59	fp->_cookie = fp;
60	fp->_read = __sread;
61	fp->_write = __swrite;
62	fp->_seek = __sseek;
63	fp->_close = __sclose;
64
65	/*
66	 * When opening in append mode, even though we use O_APPEND,
67	 * we need to seek to the end so that ftell() gets the right
68	 * answer.  If the user then alters the seek pointer, or
69	 * the file extends, this will fail, but there is not much
70	 * we can do about this.  (We could set __SAPP and check in
71	 * fseek and ftell.)
72	 */
73	if (oflags & O_APPEND)
74		(void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
75	return (fp);
76}
77