Drizzled Public API Documentation

unsigned.cc
1 /* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2010 Brian Aker
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; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <config.h>
22 
23 #include <drizzled/charset.h>
24 #include <drizzled/error.h>
25 #include <drizzled/function/cast/unsigned.h>
26 #include <drizzled/lex_string.h>
27 
28 namespace drizzled {
29 namespace function {
30 namespace cast {
31 
33 {
34  str->append(STRING_WITH_LEN("cast("));
35  args[0]->print(str);
36  str->append(STRING_WITH_LEN(" as unsigned)"));
37 
38 }
39 
40 
42 {
43  int64_t value= 0;
44  int error= 0;
45  char buff[MAX_FIELD_WIDTH];
46  String tmp(buff,sizeof(buff), &my_charset_bin), *res;
47 
48  /*
49  For a string result, we must first get the string and then convert it
50  to a longlong
51  */
52 
53  if (not (res= args[0]->val_str(&tmp)))
54  {
55  null_value= true;
56  error= 0;
57  return 0;
58  }
59  null_value= false;
60 
61  char *end= res->ptr() + res->length();
62 
63  if (res->length() and ((char *)res->ptr())[0] == '-')
64  {
65  error= -1;
66  }
67  else
68  {
69  value= res->charset()->cset->strntoull10rnd(res->charset(),
70  res->ptr(),
71  res->length(),
72  true, &end, &error);
73  }
74 
75  if (error or (end != res->ptr() + res->length()))
76  {
77  my_error(ER_INVALID_CAST_TO_UNSIGNED, MYF(0), res->c_str());
78  }
79 
80  return value;
81 }
82 
83 } // namespace cast
84 } // namespace function
85 } // namespace drizzled