/** @file
Implementation of fwrite as declared in <stdio.h>.
Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License that accompanies this
distribution. The full text of the license may be found at
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Copyright (c) 1990, 1993
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
Chris Torek.
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modification, are permitted provided that the following conditions
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- Redistributions of source code must retain the above copyright
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- Redistributions in binary form must reproduce the above copyright
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- Neither the name of the University nor the names of its contributors
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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NetBSD: fwrite.c,v 1.16 2005/11/29 03:12:00 christos Exp
fwrite.c 8.1 (Berkeley) 6/4/93
**/
#include <LibConfig.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include "reentrant.h"
#include "local.h"
#include "fvwrite.h"
/*
* Write `count' objects (each size `size') from memory to the given file.
* Return the number of whole objects written.
*/
size_t
fwrite(const void *buf, size_t size, size_t count, FILE *fp)
{
size_t n;
struct __suio uio;
struct __siov iov;
_DIAGASSERT(fp != NULL);
if(fp == NULL) {
errno = EINVAL;
return (0);
}
/*
* SUSv2 requires a return value of 0 for a count or a size of 0.
*/
if ((n = count * size) == 0)
return (0);
_DIAGASSERT(buf != NULL);
iov.iov_base = __UNCONST(buf);
uio.uio_resid = (int)(iov.iov_len = n);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
/*
* The usual case is success (__sfvwrite returns 0);
* skip the divide if this happens, since divides are
* generally slow and since this occurs whenever size==0.
*/
FLOCKFILE(fp);
if (__sfvwrite(fp, &uio) != 0)
count = ((n - uio.uio_resid) / size);
FUNLOCKFILE(fp);
return (count);
}