1/*	$OpenBSD: fwrite.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */
2/*-
3 * Copyright (c) 1990, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <stdio.h>
35#include "local.h"
36#include "fvwrite.h"
37
38/*
39 * Write `count' objects (each size `size') from memory to the given file.
40 * Return the number of whole objects written.
41 */
42size_t
43fwrite(const void *buf, size_t size, size_t count, FILE *fp)
44{
45	size_t n;
46	struct __suio uio;
47	struct __siov iov;
48	int ret;
49
50	iov.iov_base = (void *)buf;
51	uio.uio_resid = iov.iov_len = n = count * size;
52	uio.uio_iov = &iov;
53	uio.uio_iovcnt = 1;
54
55	/*
56	 * The usual case is success (__sfvwrite returns 0);
57	 * skip the divide if this happens, since divides are
58	 * generally slow and since this occurs whenever size==0.
59	 */
60	FLOCKFILE(fp);
61	ret = __sfvwrite(fp, &uio);
62	FUNLOCKFILE(fp);
63	if (ret == 0)
64		return (count);
65	return ((n - uio.uio_resid) / size);
66}
67