?? file-reverse.cpp
字號:
// file-reverse.cpp,v 4.9 2003/11/01 11:15:23 dhinton Exp
// Print a file in reverse by using the ACE memory mapped file
// wrapper. It is SO easy to do compared with alternatives!
#include "ace/OS_main.h"
#include "ace/Mem_Map.h"
#include "ace/Log_Msg.h"
ACE_RCSID(file_reverse, file_reverse, "file-reverse.cpp,v 4.9 2003/11/01 11:15:23 dhinton Exp")
static void
putline (const char *s)
{
while (putchar (*s++) != '\n')
continue;
}
static void
print_array_in_reverse (char *array,
int size)
{
if (size <= 0)
return;
size--;
if (array[size] == '\0')
array[size] = '\n';
while (--size >= 0)
if (array[size] == '\n')
putline (array + size + 1);
putline (array);
}
int
ACE_TMAIN (int argc, ACE_TCHAR **argv)
{
ACE_LOG_MSG->open (argv[0]);
if (argc != 2)
ACE_ERROR_RETURN ((LM_ERROR,
"usage: %n file\n"),
-1);
ACE_Mem_Map mmap;
if (mmap.map (argv[1], -1, O_RDWR) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%n: %p\n",
"mmap"),
-1);
print_array_in_reverse ((char *) mmap.addr (),
mmap.size ());
return 0;
}
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