Subversion Repositories shark

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 pj 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
#if 0
39
static char sccsid[] = "@(#)flags.c     8.1 (Berkeley) 6/4/93";
40
#endif
41
static const char rcsid[] =
42
                "$\Id: flags.c,v 1.3 1996/06/22 10:33:13 jraynard Exp $";
43
#endif /* LIBC_SCCS and not lint */
44
 
45
#include <sys/types.h>
46
#include <sys/file.h>
47
#include <stdio.h>
48
#include <errno.h>
49
#include "local.h"
50
 
51
/*
52
 * Return the (stdio) flags for a given mode.  Store the flags
53
 * to be passed to an open() syscall through *optr.
54
 * Return 0 on error.
55
 */
56
int
57
__sflags(mode, optr)
58
        register const char *mode;
59
        int *optr;
60
{
61
        register int ret, m, o;
62
 
63
        switch (*mode++) {
64
 
65
        case 'r':       /* open for reading */
66
                ret = __SRD;
67
                m = O_RDONLY;
68
                o = 0;
69
                break;
70
 
71
        case 'w':       /* open for writing */
72
                ret = __SWR;
73
                m = O_WRONLY;
74
                o = O_CREAT | O_TRUNC;
75
                break;
76
 
77
        case 'a':       /* open for appending */
78
                ret = __SWR;
79
                m = O_WRONLY;
80
                o = O_CREAT | O_APPEND;
81
                break;
82
 
83
        default:        /* illegal mode */
84
                errno = EINVAL;
85
                return (0);
86
        }
87
 
88
        /* [rwa]\+ or [rwa]b\+ means read and write */
89
        if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
90
                ret = __SRW;
91
                m = O_RDWR;
92
        }
93
        *optr = m | o;
94
        return (ret);
95
}