Colony » Colony Scout

/*-

 * 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 "local.h"

/*

 * Write the given character into the (probably full) buffer for

 * the given file.  Flush the buffer out if it is or becomes full,

 * or if c=='\n' and the file is line buffered.

 */

int

__swbuf(c, fp)

        int c;

        FILE *fp;

{

        int n;

        if (cantwrite(fp))

                return (EOF);

        c = (unsigned char)c;

        /*

         * If it is completely full, flush it out.  Then, in any case,

         * stuff c into the buffer.  If this causes the buffer to fill

         * completely, or if c is '\n' and the file is line buffered,

         * flush it (perhaps a second time).  The second flush will always

         * happen on unbuffered streams, where _bf._size==1; fflush()

         * guarantees that putc() will always call wbuf() by setting _w

         * to 0, so we need not do anything else.

         */

        n = fp->_p - fp->_bf._base;

        if (n >= fp->_bf._size) {

                if (fflush(fp))

                        return (EOF);

                n = 0;

        }

        fp->_w--;

        *fp->_p++ = c;

        if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))

                if (fflush(fp))

                        return (EOF);

        return (c);

}

int

putc(c, fp)

        int c;

        FILE *fp;

{

        if (--fp->_w >= 0)

                return (*fp->_p++ = c);

        else

                return (__swbuf(c, fp));

}