fopen.c - vx32 - Local 9vx git repository for patches.
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---
fopen.c (3107B)
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1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char rcsid[] = "$OpenBSD: fopen.c,v 1.2 1996/08/19 08:32:41 tholo Exp $";
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <sys/types.h>
42 #include <sys/stat.h>
43 #include <fcntl.h>
44 #include <stdio.h>
45 #include <errno.h>
46 #include "local.h"
47
48 FILE *
49 fopen(file, mode)
50 const char *file;
51 const char *mode;
52 {
53 register FILE *fp;
54 register int f;
55 int flags, oflags;
56
57 if ((flags = __sflags(mode, &oflags)) == 0)
58 return (NULL);
59 if ((fp = __sfp()) == NULL)
60 return (NULL);
61 if ((f = open(file, oflags, DEFFILEMODE)) < 0) {
62 fp->_flags = 0; /* release */
63 return (NULL);
64 }
65 fp->_file = f;
66 fp->_flags = flags;
67 fp->_cookie = fp;
68 fp->_read = __sread;
69 fp->_write = __swrite;
70 fp->_seek = __sseek;
71 fp->_close = __sclose;
72
73 /*
74 * When opening in append mode, even though we use O_APPEND,
75 * we need to seek to the end so that ftell() gets the right
76 * answer. If the user then alters the seek pointer, or
77 * the file extends, this will fail, but there is not much
78 * we can do about this. (We could set __SAPP and check in
79 * fseek and ftell.)
80 */
81 if (oflags & O_APPEND)
82 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
83 return (fp);
84 }