/*- * 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. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. 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. */ #if defined(LIBC_SCCS) && !defined(lint)static char rcsid[] = "$OpenBSD: fread.c,v 1.2 1996/08/19 08:32:44 tholo Exp $";#endif /* LIBC_SCCS and not lint */ #include <stdio.h>#include <string.h>#include "local.h" size_tfread(buf, size, count, fp)	void *buf;	size_t size, count;	register FILE *fp;{	register size_t resid;	register char *p;	register 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 > (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);}