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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
|
37__FBSDID("$FreeBSD: head/lib/libc/stdio/fopen.c 165903 2007-01-09 00:28:16Z imp $");
|
| 37__FBSDID("$FreeBSD: head/lib/libc/stdio/fopen.c 176628 2008-02-27 19:02:02Z jhb $"); |
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <fcntl.h>
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| 43#include <unistd.h> |
44#include <stdio.h>
45#include <errno.h>
46#include "un-namespace.h"
47
48#include "local.h"
49
50FILE *
51fopen(file, mode)
52 const char * __restrict file;
53 const char * __restrict mode;
54{
55 FILE *fp;
56 int f;
57 int flags, oflags;
58
59 if ((flags = __sflags(mode, &oflags)) == 0)
60 return (NULL);
61 if ((fp = __sfp()) == NULL)
62 return (NULL);
63 if ((f = _open(file, oflags, DEFFILEMODE)) < 0) {
64 fp->_flags = 0; /* release */
65 return (NULL);
66 }
|
67 /*
68 * File descriptors are a full int, but _file is only a short.
69 * If we get a valid file descriptor that is greater than
70 * SHRT_MAX, then the fd will get sign-extended into an
71 * invalid file descriptor. Handle this case by failing the
72 * open.
73 */
74 if (f > SHRT_MAX) {
75 _close(f);
76 errno = EMFILE;
77 return (NULL);
78 } |
79 fp->_file = f;
80 fp->_flags = flags;
81 fp->_cookie = fp;
82 fp->_read = __sread;
83 fp->_write = __swrite;
84 fp->_seek = __sseek;
85 fp->_close = __sclose;
86 /*
87 * When opening in append mode, even though we use O_APPEND,
88 * we need to seek to the end so that ftell() gets the right
89 * answer. If the user then alters the seek pointer, or
90 * the file extends, this will fail, but there is not much
91 * we can do about this. (We could set __SAPP and check in
92 * fseek and ftell.)
93 */
94 if (oflags & O_APPEND)
95 (void)_sseek(fp, (fpos_t)0, SEEK_END);
96 return (fp);
97}
|