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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <drizzled/server_includes.h>
#include CSTDINT_H
#include <drizzled/function/str/reverse.h>
String *Item_func_reverse::val_str(String *str)
{
assert(fixed == 1);
String *res = args[0]->val_str(str);
char *ptr, *end, *tmp;
if ((null_value=args[0]->null_value))
return 0;
/* An empty string is a special case as the string pointer may be null */
if (!res->length())
return &my_empty_string;
if (tmp_value.alloced_length() < res->length() &&
tmp_value.realloc(res->length()))
{
null_value= 1;
return 0;
}
tmp_value.length(res->length());
tmp_value.set_charset(res->charset());
ptr= (char *) res->ptr();
end= ptr + res->length();
tmp= (char *) tmp_value.ptr() + tmp_value.length();
#ifdef USE_MB
if (use_mb(res->charset()))
{
register uint32_t l;
while (ptr < end)
{
if ((l= my_ismbchar(res->charset(),ptr,end)))
{
tmp-= l;
memcpy(tmp,ptr,l);
ptr+= l;
}
else
*--tmp= *ptr++;
}
}
else
#endif /* USE_MB */
{
while (ptr < end)
*--tmp= *ptr++;
}
return &tmp_value;
}
void Item_func_reverse::fix_length_and_dec()
{
collation.set(args[0]->collation);
max_length = args[0]->max_length;
}
|