Subversion Repositories shark

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)flags.c     8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
                "$\Id: flags.c,v 1.3 1996/06/22 10:33:13 jraynard Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/file.h>
#include <stdio.h>
#include <errno.h>
#include "local.h"

/*
 * Return the (stdio) flags for a given mode.  Store the flags
 * to be passed to an open() syscall through *optr.
 * Return 0 on error.
 */
int
__sflags(mode, optr)
        register const char *mode;
        int *optr;
{
        register int ret, m, o;

        switch (*mode++) {

        case 'r':       /* open for reading */
                ret = __SRD;
                m = O_RDONLY;
                o = 0;
                break;

        case 'w':       /* open for writing */
                ret = __SWR;
                m = O_WRONLY;
                o = O_CREAT | O_TRUNC;
                break;

        case 'a':       /* open for appending */
                ret = __SWR;
                m = O_WRONLY;
                o = O_CREAT | O_APPEND;
                break;

        default:        /* illegal mode */
                errno = EINVAL;
                return (0);
        }

        /* [rwa]\+ or [rwa]b\+ means read and write */
        if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
                ret = __SRW;
                m = O_RDWR;
        }
        *optr = m | o;
        return (ret);
}