Annotation of prex-old/usr/lib/libc/stdio/fopen.c, Revision 1.1.1.1
1.1 nbrk 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. 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: #include <sys/types.h>
34: #include <sys/stat.h>
35: #include <fcntl.h>
36: #include <stdio.h>
37: #include <errno.h>
38: #include "local.h"
39:
40: FILE *
41: fopen(file, mode)
42: const char *file;
43: 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:
60: /*
61: * When opening in append mode, even though we use O_APPEND,
62: * we need to seek to the end so that ftell() gets the right
63: * answer. If the user then alters the seek pointer, or
64: * the file extends, this will fail, but there is not much
65: * we can do about this. (We could set __SAPP and check in
66: * fseek and ftell.)
67: */
68: if (oflags & O_APPEND)
69: (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
70: return (fp);
71: }
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