1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// $Id: file-reverse.cpp 91671 2010-09-08 18:39:23Z johnnyw $
// 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"
#include "ace/Truncate.h"
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], static_cast<size_t> (-1), O_RDWR) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%n: %p\n",
"mmap"),
-1);
print_array_in_reverse ((char *) mmap.addr (),
ACE_Utils::truncate_cast<int> (mmap.size ()));
return 0;
}
|
