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)␊ |
34 | static 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 | ␊ |
45 | ␊ |
46 | /*␊ |
47 | * Write `count' objects (each size `size') from memory to the given file.␊ |
48 | * Return the number of whole objects written.␊ |
49 | */␊ |
50 | size_t␊ |
51 | fwrite(buf, size, count, fp)␊ |
52 | ␉const void * __restrict buf;␊ |
53 | ␉size_t size, count;␊ |
54 | ␉FILE * __restrict fp;␊ |
55 | {␊ |
56 | ␉size_t n;␊ |
57 | ␉struct __suio uio;␊ |
58 | ␉struct __siov iov;␊ |
59 | ␊ |
60 | ␉/*␊ |
61 | ␉ * ANSI and SUSv2 require a return value of 0 if size or count are 0.␊ |
62 | ␉ */␊ |
63 | ␉n = count * size;␊ |
64 | #if __DARWIN_UNIX03␊ |
65 | ␉if (n == 0)␊ |
66 | ␉␉return (0);␊ |
67 | #endif␊ |
68 | ␉iov.iov_base = (void *)buf;␊ |
69 | ␉uio.uio_resid = iov.iov_len = n;␊ |
70 | ␉uio.uio_iov = &iov;␊ |
71 | ␉uio.uio_iovcnt = 1;␊ |
72 | ␊ |
73 | ␉ORIENT(fp, -1);␊ |
74 | ␉/*␊ |
75 | ␉ * The usual case is success (__sfvwrite returns 0);␊ |
76 | ␉ * skip the divide if this happens, since divides are␊ |
77 | ␉ * generally slow and since this occurs whenever size==0.␊ |
78 | ␉ */␊ |
79 | ␉if (__sfvwrite(fp, &uio) != 0)␊ |
80 | ␉ count = (n - uio.uio_resid) / size;␊ |
81 | ␉return (count);␊ |
82 | }␊ |
83 | |