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 <string.h>

#include "local.h"

size_t

fread(buf, size, count, fp)

        void *buf;

        size_t size, count;

        FILE *fp;

{

        size_t resid;

        char *p;

        int r;

        size_t total;

        /*

         * The ANSI standard requires a return value of 0 for a count

         * or a size of 0.  Peculiarily, it imposes no such requirements

         * on fwrite; it only requires fread to be broken.

         */

        if ((resid = count * size) == 0)

                return (0);

        if (fp->_r < 0)

                fp->_r = 0;

        total = resid;

        p = buf;

        while (resid > (size_t)(r = fp->_r)) {

                (void)memcpy((void *)p, (void *)fp->_p, (size_t)r);

                fp->_p += r;

                /* fp->_r = 0 ... done in __srefill */

                p += r;

                resid -= r;

                if (__srefill(fp)) {

                        /* no more input: return partial result */

                        return ((total - resid) / size);

                }

        }

        (void)memcpy((void *)p, (void *)fp->_p, resid);

        fp->_r -= resid;

        fp->_p += resid;

        return (count);

}