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#测试 #file #delete #filenames #os #optimization

// $Id: Mem_Map_Test.cpp 80826 2008-03-04 14:51:23Z wotte $

// ============================================================================
//
// = LIBRARY
//    tests
//
// = FILENAME
//    Mem_Map_Test.cpp
//
// = DESCRIPTION
//      This test illustrates the use of ACE_Mem_Map to reverse a
//      file. The test first creates a dummy file for testing, then
//      reverses the file and then reverses it again to get back the
//      original file.
//
// = AUTHOR
//    Prashant Jain 
//
// ============================================================================

#include "test_config.h"
#include "ace/Mem_Map.h"
#include "ace/ACE.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_unistd.h"
#include "ace/OS_NS_fcntl.h"
#include "ace/OS_Memory.h"

ACE_RCSID(tests, Mem_Map_Test, "Mem_Map_Test.cpp,v 4.36 2003/11/01 11:15:25 dhinton Exp")

#if !defined (ACE_LACKS_MMAP)

static const char ACE_ALPHABET[] = "abcdefghijklmnopqrstuvwxyz";
static const int LINE_LENGTH = 10;
static const int NUM_LINES = 15;

static void
reverse_file (ACE_HANDLE file_handle,
              char *array,
              size_t size)
{
  int count = 0;
  // LynxOS 3.0.0/PowerPC needs the volatile qualifier, with -O2
  // optimization enabled and without ACE_HAS_INLINE.
  volatile size_t i = size;
  --i;

  if (array[i] == '/0')
    array[i] = '/n';

  while (i-- > 0)
    {
      if (array[i] == '/n')
        {
          ACE_OS::write (file_handle, array + i + 1, count);
          ACE_OS::write (file_handle, ACE_TEXT ("/n"), 1);
          count = 0;
        }
      else
        count++;
    }
  ACE_OS::write (file_handle, array, count+1);
}

static int
create_test_file (ACE_TCHAR *filename, int line_length, int num_lines)
{
  char *mybuf = 0;

  ACE_NEW_RETURN (mybuf, char[line_length + 1], -1);
  const char *c = ACE_ALPHABET;
  const char *d = c;
#if defined (__QNXNTO__) || (defined (ACE_VXWORKS) && (ACE_VXWORKS <= 0x640))
  // For NTO has to applied to open the file, as Mem_Map can map only shared memory
  ACE_Mem_Map mmap_4_open;
  mmap_4_open.open (filename, O_RDWR | O_CREAT | O_TRUNC, ACE_DEFAULT_FILE_PERMS);
  ACE_HANDLE file_handle  = mmap_4_open.handle();
#else
  ACE_HANDLE file_handle = ACE_OS::open (filename,
                                         O_RDWR | O_CREAT | O_TRUNC,
                                         ACE_DEFAULT_FILE_PERMS);
#endif
  if (file_handle  == ACE_INVALID_HANDLE)
    {
      delete [] mybuf;
      ACE_ERROR_RETURN ((LM_ERROR,
                         ACE_TEXT ("Open failed for %s/n"),
                         filename),
                        -1);
    }

  for (int j = 0; j < num_lines; j++)
    {
      for (int i = 0; i < line_length; i++)
        {
          mybuf[i] = *c;
          c++;
        }

      mybuf[line_length] = '/0';

      c = ++d;

      if (ACE_OS::write (file_handle, mybuf, line_length) != line_length)
        {
          delete [] mybuf;
          ACE_ERROR_RETURN ((LM_ERROR,
                             ACE_TEXT ("%p (%d)