Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  */
       9             : 
      10             : #include "readwrite_helper.h"
      11             : 
      12             : #include <osl/diagnose.h>
      13             : #include <system.h>
      14             : 
      15           0 : sal_Bool safeWrite(int fd, void* data, sal_uInt32 dataSize)
      16             : {
      17           0 :     sal_Int32 nToWrite = dataSize;
      18           0 :     unsigned char* dataToWrite = data;
      19             : 
      20             :     // Check for overflow as we convert a signed to an unsigned.
      21             :     OSL_ASSERT(dataSize == (sal_uInt32)nToWrite);
      22           0 :     while ( nToWrite ) {
      23           0 :         sal_Int32 nWritten = write(fd, dataToWrite, nToWrite);
      24           0 :         if ( nWritten < 0 ) {
      25           0 :             if ( errno == EINTR )
      26           0 :                 continue;
      27             : 
      28           0 :             return sal_False;
      29             : 
      30             :         }
      31             : 
      32             :         OSL_ASSERT(nWritten > 0);
      33           0 :         nToWrite -= nWritten;
      34           0 :         dataToWrite += nWritten;
      35             :     }
      36             : 
      37           0 :     return sal_True;
      38             : }
      39             : 
      40           0 : sal_Bool safeRead( int fd, void* buffer, sal_uInt32 count )
      41             : {
      42           0 :     sal_Int32 nToRead = count;
      43           0 :     unsigned char* bufferForReading = buffer;
      44             : 
      45             :     // Check for overflow as we convert a signed to an unsigned.
      46             :     OSL_ASSERT(count == (sal_uInt32)nToRead);
      47           0 :     while ( nToRead ) {
      48           0 :         sal_Int32 nRead = read(fd, bufferForReading, nToRead);
      49           0 :         if ( nRead < 0 ) {
      50             :             // We were interrupted before reading, retry.
      51           0 :             if (errno == EINTR)
      52           0 :                 continue;
      53             : 
      54           0 :             return sal_False;
      55             :         }
      56             : 
      57             :         // If we reach the EOF, we consider this a partial transfer and thus
      58             :         // an error.
      59           0 :         if ( nRead == 0 )
      60           0 :             return sal_False;
      61             : 
      62           0 :         nToRead -= nRead;
      63           0 :         bufferForReading += nRead;
      64             :     }
      65             : 
      66           0 :     return sal_True;
      67             : }
      68             : 
      69             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */