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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. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *      This product includes software developed by the University of
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 *      California, Berkeley and its contributors.
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 * 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)funopen.c   8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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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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funopen(cookie, readfn, writefn, seekfn, closefn)
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        const void *cookie;
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        int (*readfn)(), (*writefn)();
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#if __STDC__
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        fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
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#else
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        fpos_t (*seekfn)();
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#endif
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        int (*closefn)();
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{
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        register FILE *fp;
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        int flags;
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        if (readfn == NULL) {
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                if (writefn == NULL) {          /* illegal */
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                        errno = EINVAL;
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                        return (NULL);
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                } else
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                        flags = __SWR;          /* write only */
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        } else {
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                if (writefn == NULL)
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                        flags = __SRD;          /* read only */
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                else
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                        flags = __SRW;          /* read-write */
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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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        fp->_file = -1;
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        fp->_cookie = (void *)cookie;
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        fp->_read = readfn;
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        fp->_write = writefn;
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        fp->_seek = seekfn;
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        fp->_close = closefn;
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        return (fp);
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}