mirror of https://github.com/acidanthera/audk.git
95 lines
3.5 KiB
C
95 lines
3.5 KiB
C
/** @file
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Implementation of fwrite as declared in <stdio.h>.
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Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License that accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Copyright (c) 1990, 1993
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The Regents of the University of California. All rights reserved.
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This code is derived from software contributed to Berkeley by
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Chris Torek.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the University nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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NetBSD: fwrite.c,v 1.16 2005/11/29 03:12:00 christos Exp
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fwrite.c 8.1 (Berkeley) 6/4/93
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**/
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#include <LibConfig.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include "reentrant.h"
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#include "local.h"
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#include "fvwrite.h"
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/*
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* Write `count' objects (each size `size') from memory to the given file.
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* Return the number of whole objects written.
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*/
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size_t
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fwrite(const void *buf, size_t size, size_t count, FILE *fp)
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{
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size_t n;
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struct __suio uio;
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struct __siov iov;
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_DIAGASSERT(fp != NULL);
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if(fp == NULL) {
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errno = EINVAL;
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return (0);
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}
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/*
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* SUSv2 requires a return value of 0 for a count or a size of 0.
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*/
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if ((n = count * size) == 0)
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return (0);
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_DIAGASSERT(buf != NULL);
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iov.iov_base = __UNCONST(buf);
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uio.uio_resid = (int)(iov.iov_len = n);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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/*
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* The usual case is success (__sfvwrite returns 0);
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* skip the divide if this happens, since divides are
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* generally slow and since this occurs whenever size==0.
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*/
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FLOCKFILE(fp);
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if (__sfvwrite(fp, &uio) != 0)
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count = ((n - uio.uio_resid) / size);
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FUNLOCKFILE(fp);
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return (count);
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}
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