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 * %sccs.include.redist.c%
9 */
10
11 #if defined(LIBC_SCCS) && !defined(lint)
12 static char sccsid[] = "@(#)fwrite.c 8.1 (Berkeley) 06/04/93";
13 #endif /* LIBC_SCCS and not lint */
14
15 #include <stdio.h>
16 #include "local.h"
17 #include "fvwrite.h"
18
19 /*
20 * Write `count' objects (each size `size') from memory to the given file.
21 * Return the number of whole objects written.
22 */
23 size_t
fwrite(buf,size,count,fp)24 fwrite(buf, size, count, fp)
25 const void *buf;
26 size_t size, count;
27 FILE *fp;
28 {
29 size_t n;
30 struct __suio uio;
31 struct __siov iov;
32
33 iov.iov_base = (void *)buf;
34 uio.uio_resid = iov.iov_len = n = count * size;
35 uio.uio_iov = &iov;
36 uio.uio_iovcnt = 1;
37
38 /*
39 * The usual case is success (__sfvwrite returns 0);
40 * skip the divide if this happens, since divides are
41 * generally slow and since this occurs whenever size==0.
42 */
43 if (__sfvwrite(fp, &uio) == 0)
44 return (count);
45 return ((n - uio.uio_resid) / size);
46 }
47