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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 <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include "local.h"
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FILE *
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fdopen(fd, mode)
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        int fd;
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        const char *mode;
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{
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        FILE *fp;
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        int flags, oflags, fdflags, tmp;
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        if ((flags = __sflags(mode, &oflags)) == 0)
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                return (NULL);
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        /* Make sure the mode the user wants is a subset of the actual mode. */
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        if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
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                return (NULL);
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        tmp = fdflags & O_ACCMODE;
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        if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
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                errno = EINVAL;
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                return (NULL);
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        }
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        if ((fp = __sfp()) == NULL)
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                return (NULL);
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        fp->_flags = flags;
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        /*
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         * If opened for appending, but underlying descriptor does not have
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         * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
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         * end before each write.
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         */
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        if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
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                fp->_flags |= __SAPP;
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        fp->_file = fd;
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        return (fp);
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}