1/*-
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)fwrite.c	8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: src/lib/libc/stdio/fwrite.c,v 1.13 2009/07/12 13:09:43 ed Exp $");
38
39#include "namespace.h"
40#include <stdio.h>
41#include "un-namespace.h"
42#include "local.h"
43#include "fvwrite.h"
44#include "libc_private.h"
45
46/*
47 * The maximum amount to write to avoid integer overflow (especially for
48 * uio_resid in struct __suio).  INT_MAX is odd, so it make sense to make it
49 * even.  We subtract (BUFSIZ - 1) to get a whole number of BUFSIZ chunks.
50 */
51#define MAXWRITE	(INT_MAX - (BUFSIZ - 1))
52
53/*
54 * Write `count' objects (each size `size') from memory to the given file.
55 * Return the number of whole objects written.
56 */
57size_t
58fwrite(buf, size, count, fp)
59	const void * __restrict buf;
60	size_t size, count;
61	FILE * __restrict fp;
62{
63	size_t n, resid;
64	struct __suio uio;
65	struct __siov iov;
66	int s;
67
68	/*
69	 * ANSI and SUSv2 require a return value of 0 if size or count are 0.
70	 */
71	n = count * size;
72#if __DARWIN_UNIX03
73	if (n == 0)
74		return (0);
75#endif
76	uio.uio_iov = &iov;
77	uio.uio_iovcnt = 1;
78
79	FLOCKFILE(fp);
80	ORIENT(fp, -1);
81
82	for (resid = n; resid > 0; buf += s, resid -= s) {
83		s = resid > INT_MAX ? MAXWRITE : (int)resid;
84		iov.iov_base = (void *)buf;
85		uio.uio_resid = iov.iov_len = s;
86
87		/*
88		 * The usual case is success (__sfvwrite returns 0);
89		 * skip the divide if this happens, since divides are
90		 * generally slow and since this occurs whenever size==0.
91		 */
92		if (__sfvwrite(fp, &uio) != 0) {
93			count = (n - resid + s - uio.uio_resid) / size;
94			break;
95		}
96	}
97	FUNLOCKFILE(fp);
98	return (count);
99}
100