Drizzled Public API Documentation

right.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include <config.h>
21 
22 #include <drizzled/function/str/right.h>
23 
24 namespace drizzled
25 {
26 
28 {
29  assert(fixed == 1);
30  String *res= args[0]->val_str(str);
31  /* must be int64_t to avoid truncation */
32  int64_t length= args[1]->val_int();
33 
34  if ((null_value=(args[0]->null_value || args[1]->null_value)))
35  return 0;
36 
37  /* if "unsigned_flag" is set, we have a *huge* positive number. */
38  if ((length <= 0) && (!args[1]->unsigned_flag))
39  return &my_empty_string;
40 
41  if (res->length() <= (uint64_t) length)
42  return res;
43 
44  uint32_t start=res->numchars();
45  if (start <= (uint) length)
46  return res;
47  start=res->charpos(start - (uint) length);
48  tmp_value.set(*res,start,res->length()-start);
49  return &tmp_value;
50 }
51 
52 void Item_func_right::fix_length_and_dec()
53 {
54  collation.set(args[0]->collation);
55  left_right_max_length();
56 }
57 
58 } /* namespace drizzled */
String * val_str(String *)
Definition: right.cc:27
virtual int64_t val_int()=0
bool fixed
Definition: item.h:120
bool null_value
Definition: item.h:122
virtual String * val_str(String *str)=0