Colony » Colony Scout » Colony Scout OS

/*-

 * 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. 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.

 */

#include <sys/types.h>

#include <sys/fcntl.h>

#include <stdio.h>

#include <errno.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(char *mode, int *optr)

{

        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);

}