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 <stdio.h>

#include <stdlib.h>

#include "local.h"

/*

 * Set one of the three kinds of buffering, optionally including

 * a buffer.

 */

int

setvbuf(fp, buf, mode, size)

        FILE *fp;

        char *buf;

        int mode;

        size_t size;

{

        int ret, flags;

        /*        int ttyflag; */

        /*

         * Verify arguments.  The `int' limit on `size' is due to this

         * particular implementation.  Note, buf and size are ignored

         * when setting _IONBF.

         */

        if (mode != _IONBF)

                if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)

                        return (EOF);

        /*

         * Write current buffer, if any.  Discard unread input (including

         * ungetc data), cancel line buffering, and free old buffer if

         * malloc()ed.  We also clear any eof condition, as if this were

         * a seek.

         */

        ret = 0;

        (void)__sflush(fp);

        if (HASUB(fp))

                FREEUB(fp);

        fp->_r = 0;

        flags = fp->_flags;

        if (buf != NULL && (flags & __SMBF))

                free((void *)fp->_bf._base);

        flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);

        /*

         * Fix up the FILE fields, and set __cleanup for output flush on

         * exit (since we are buffered in some way).

         */

        if (mode == _IOLBF)

                flags |= __SLBF;

        fp->_flags = flags;

        /*

         * If buffer is NULL, we change only buffering mode.

         */

        if (buf == NULL)

                return 0;

        fp->_bf._base = fp->_p = (unsigned char *)buf;

        fp->_bf._size = size;

        fp->_w = 0;

        __cleanup = _cleanup;

        return (ret);

}