Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * Version: MPL 1.1 / GPLv3+ / LGPLv3+
       4             :  *
       5             :  * The contents of this file are subject to the Mozilla Public License Version
       6             :  * 1.1 (the "License"); you may not use this file except in compliance with
       7             :  * the License or as specified alternatively below. You may obtain a copy of
       8             :  * the License at http://www.mozilla.org/MPL/
       9             :  *
      10             :  * Software distributed under the License is distributed on an "AS IS" basis,
      11             :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12             :  * for the specific language governing rights and limitations under the
      13             :  * License.
      14             :  *
      15             :  * The Initial Developer of the Original Code is
      16             :  *       Julien Chaffraix <julien.chaffraix@gmail.com>
      17             :  * Portions created by the Initial Developer are Copyright (C) 2011 the
      18             :  * Initial Developer. All Rights Reserved.
      19             :  *
      20             :  * Major Contributor(s):
      21             :  *
      22             :  * For minor contributions see the git repository.
      23             :  *
      24             :  * Alternatively, the contents of this file may be used under the terms of
      25             :  * either the GNU General Public License Version 3 or later (the "GPLv3+"), or
      26             :  * the GNU Lesser General Public License Version 3 or later (the "LGPLv3+"),
      27             :  * in which case the provisions of the GPLv3+ or the LGPLv3+ are applicable
      28             :  * instead of those above.
      29             :  */
      30             : 
      31             : #include "readwrite_helper.h"
      32             : 
      33             : #include <osl/diagnose.h>
      34             : #include <system.h>
      35             : 
      36         657 : sal_Bool safeWrite(int fd, void* data, sal_uInt32 dataSize)
      37             : {
      38         657 :     sal_Int32 nToWrite = dataSize;
      39         657 :     unsigned char* dataToWrite = data;
      40             : 
      41             :     // Check for overflow as we convert a signed to an unsigned.
      42             :     OSL_ASSERT(dataSize == (sal_uInt32)nToWrite);
      43        1971 :     while ( nToWrite ) {
      44         657 :         sal_Int32 nWritten = write(fd, dataToWrite, nToWrite);
      45         657 :         if ( nWritten < 0 ) {
      46           0 :             if ( errno == EINTR )
      47           0 :                 continue;
      48             : 
      49           0 :             return sal_False;
      50             : 
      51             :         }
      52             : 
      53             :         OSL_ASSERT(nWritten > 0);
      54         657 :         nToWrite -= nWritten;
      55         657 :         dataToWrite += nWritten;
      56             :     }
      57             : 
      58         657 :     return sal_True;
      59             : }
      60             : 
      61           0 : sal_Bool safeRead( int fd, void* buffer, sal_uInt32 count )
      62             : {
      63           0 :     sal_Int32 nToRead = count;
      64           0 :     unsigned char* bufferForReading = buffer;
      65             : 
      66             :     // Check for overflow as we convert a signed to an unsigned.
      67             :     OSL_ASSERT(count == (sal_uInt32)nToRead);
      68           0 :     while ( nToRead ) {
      69           0 :         sal_Int32 nRead = read(fd, bufferForReading, nToRead);
      70           0 :         if ( nRead < 0 ) {
      71             :             // We were interrupted before reading, retry.
      72           0 :             if (errno == EINTR)
      73           0 :                 continue;
      74             : 
      75           0 :             return sal_False;
      76             :         }
      77             : 
      78             :         // If we reach the EOF, we consider this a partial transfer and thus
      79             :         // an error.
      80           0 :         if ( nRead == 0 )
      81           0 :             return sal_False;
      82             : 
      83           0 :         nToRead -= nRead;
      84           0 :         bufferForReading += nRead;
      85             :     }
      86             : 
      87           0 :     return sal_True;
      88             : }
      89             : 
      90             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */