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/*-
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 * Copyright (c) 1990, 1993
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 *        The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Chris Torek.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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/*
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 * Return the (stdio) flags for a given mode.  Store the flags
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 * to be passed to an open() syscall through *optr.
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 * Return 0 on error.
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 */
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int
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__sflags(char *mode, int *optr)
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{
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        int ret, m, o;
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        switch (*mode++) {
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        case 'r':        /* open for reading */
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                ret = __SRD;
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                m = O_RDONLY;
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                o = 0;
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                break;
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        case 'w':        /* open for writing */
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                ret = __SWR;
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                m = O_WRONLY;
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                o = O_CREAT | O_TRUNC;
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                break;
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        case 'a':        /* open for appending */
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                ret = __SWR;
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                m = O_WRONLY;
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                o = O_CREAT | O_APPEND;
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                break;
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        default:        /* illegal mode */
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                errno = EINVAL;
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                return (0);
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        }
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        /* [rwa]\+ or [rwa]b\+ means read and write */
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        if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
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                ret = __SRW;
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                m = O_RDWR;
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        }
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        *optr = m | o;
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        return (ret);
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}