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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 <stdio.h>
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#include <stdlib.h>
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#include "local.h"
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/*
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 * Set one of the three kinds of buffering, optionally including
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 * a buffer.
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 */
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int
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setvbuf(fp, buf, mode, size)
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        FILE *fp;
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        char *buf;
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        int mode;
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        size_t size;
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{
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        int ret, flags;
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        /*        int ttyflag; */
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        /*
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         * Verify arguments.  The `int' limit on `size' is due to this
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         * particular implementation.  Note, buf and size are ignored
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         * when setting _IONBF.
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         */
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        if (mode != _IONBF)
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                if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
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                        return (EOF);
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        /*
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         * Write current buffer, if any.  Discard unread input (including
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         * ungetc data), cancel line buffering, and free old buffer if
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         * malloc()ed.  We also clear any eof condition, as if this were
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         * a seek.
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         */
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        ret = 0;
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        (void)__sflush(fp);
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        if (HASUB(fp))
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                FREEUB(fp);
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        fp->_r = 0;
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        flags = fp->_flags;
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        if (buf != NULL && (flags & __SMBF))
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                free((void *)fp->_bf._base);
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        flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);
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        /*
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         * Fix up the FILE fields, and set __cleanup for output flush on
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         * exit (since we are buffered in some way).
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         */
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        if (mode == _IOLBF)
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                flags |= __SLBF;
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        fp->_flags = flags;
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        /*
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         * If buffer is NULL, we change only buffering mode.
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         */
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        if (buf == NULL)
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                return 0;
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        fp->_bf._base = fp->_p = (unsigned char *)buf;
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        fp->_bf._size = size;
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        fp->_w = 0;
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        __cleanup = _cleanup;
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        return (ret);
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}