1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * 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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)fwrite.c 5.5 (Berkeley) 2/24/91";
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <stdio.h>
42 #include "local.h"
43 #include "fvwrite.h"
44
45 /*
46 * Write `count' objects (each size `size') from memory to the given file.
47 * Return the number of whole objects written.
48 */
fwrite(buf,size,count,fp)49 fwrite(buf, size, count, fp)
50 const void *buf;
51 size_t size, count;
52 FILE *fp;
53 {
54 size_t n;
55 struct __suio uio;
56 struct __siov iov;
57
58 iov.iov_base = (void *)buf;
59 uio.uio_resid = iov.iov_len = n = count * size;
60 uio.uio_iov = &iov;
61 uio.uio_iovcnt = 1;
62
63 /*
64 * The usual case is success (__sfvwrite returns 0);
65 * skip the divide if this happens, since divides are
66 * generally slow and since this occurs whenever size==0.
67 */
68 if (__sfvwrite(fp, &uio) == 0)
69 return (count);
70 return ((n - uio.uio_resid) / size);
71 }
72