90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* Version: MPL 1.1 / GPLv3+ / LGPLv3+
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License or as specified alternatively below. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Initial Developer of the Original Code is
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* Julien Chaffraix <julien.chaffraix@gmail.com>
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* Portions created by the Initial Developer are Copyright (C) 2011 the
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* Initial Developer. All Rights Reserved.
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*
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* Major Contributor(s):
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*
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* For minor contributions see the git repository.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 3 or later (the "GPLv3+"), or
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* the GNU Lesser General Public License Version 3 or later (the "LGPLv3+"),
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* in which case the provisions of the GPLv3+ or the LGPLv3+ are applicable
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* instead of those above.
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*/
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#include "readwrite_helper.h"
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#include <osl/diagnose.h>
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#include <system.h>
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sal_Bool safeWrite(int fd, void* data, sal_uInt32 dataSize)
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{
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sal_Int32 nToWrite = dataSize;
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unsigned char* dataToWrite = data;
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// Check for overflow as we convert a signed to an unsigned.
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OSL_ASSERT(dataSize == (sal_uInt32)nToWrite);
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while ( nToWrite ) {
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sal_Int32 nWritten = write(fd, dataToWrite, nToWrite);
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if ( nWritten < 0 ) {
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if ( errno == EINTR )
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continue;
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return sal_False;
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}
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OSL_ASSERT(nWritten > 0);
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nToWrite -= nWritten;
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dataToWrite += nWritten;
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}
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return sal_True;
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}
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sal_Bool safeRead( int fd, void* buffer, sal_uInt32 count )
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{
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sal_Int32 nToRead = count;
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unsigned char* bufferForReading = buffer;
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// Check for overflow as we convert a signed to an unsigned.
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OSL_ASSERT(count == (sal_uInt32)nToRead);
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while ( nToRead ) {
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sal_Int32 nRead = read(fd, bufferForReading, nToRead);
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if ( nRead < 0 ) {
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// We were interrupted before reading, retry.
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if (errno == EINTR)
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continue;
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return sal_False;
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}
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// If we reach the EOF, we consider this a partial transfer and thus
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// an error.
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if ( nRead == 0 )
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return sal_False;
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nToRead -= nRead;
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bufferForReading += nRead;
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}
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return sal_True;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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