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 * 3. 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 * @(#)fwrite.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/fwrite.c,v 1.12 2007/01/09 00:28:06 imp Exp $
34 */
35
36 #include "namespace.h"
37 #include <stdio.h>
38 #include "un-namespace.h"
39 #include "local.h"
40 #include "libc_private.h"
41
42 /*
43 * Write `count' objects (each size `size') from memory to the given file.
44 * Return the number of whole objects written.
45 */
46 size_t
fwrite_unlocked(const void * __restrict buf,size_t size,size_t count,FILE * __restrict fp)47 fwrite_unlocked(const void * __restrict buf, size_t size, size_t count,
48 FILE * __restrict fp)
49 {
50 size_t n;
51 struct __suio uio;
52 struct __siov iov;
53
54 iov.iov_base = __DECONST(void *, buf);
55 uio.uio_resid = iov.iov_len = n = count * size;
56 uio.uio_iov = &iov;
57 uio.uio_iovcnt = 1;
58
59 ORIENT(fp, -1);
60 /*
61 * The usual case is success (__sfvwrite returns 0);
62 * skip the divide if this happens, since divides are
63 * generally slow and since this occurs whenever size==0.
64 */
65 if (__sfvwrite(fp, &uio) != 0)
66 count = (n - uio.uio_resid) / size;
67 return (count);
68 }
69
70 size_t
fwrite(const void * __restrict buf,size_t size,size_t count,FILE * __restrict fp)71 fwrite(const void * __restrict buf, size_t size, size_t count,
72 FILE * __restrict fp)
73 {
74 size_t n;
75
76 FLOCKFILE(fp);
77 n = fwrite_unlocked(buf, size, count, fp);
78 FUNLOCKFILE(fp);
79 return (n);
80 }
81