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 <errno.h>

#include <stdio.h>

#include "local.h"

/* Flush a single file, or (if fp is NULL) all files.  */

int

fflush(fp)

        FILE *fp;

{

        if (fp == NULL)

                return (_fwalk(__sflush));

        if ((fp->_flags & (__SWR | __SRW)) == 0) {

                errno = EBADF;

                return (EOF);

        }

        return (__sflush(fp));

}

int

__sflush(fp)

        FILE *fp;

{

        unsigned char *p;

        int n, t;

        t = fp->_flags;

        if ((t & __SWR) == 0)

                return (0);

        if ((p = fp->_bf._base) == NULL)

                return (0);

        n = fp->_p - p;                /* write this much */

        /*

         * Set these immediately to avoid problems with longjmp and to allow

         * exchange buffering (via setvbuf) in user write function.

         */

        fp->_p = p;

        fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;

        for (; n > 0; n -= t, p += t) {

                t = __swrite(fp, (char *)p, n);

                if (t <= 0) {

                        fp->_flags |= __SERR;

                        return (EOF);

                }

        }

        return (0);

}