Drizzled Public API Documentation

environmental.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 <plugin/utility_dictionary/dictionary.h>
24 
25 #include <drizzled/atomics.h>
26 #include <drizzled/session.h>
27 
28 extern char **environ;
29 
30 using namespace drizzled;
31 using namespace std;
32 
33 #define LARGEST_ENV_STRING 512
34 
35 utility_dictionary::Environmental::Environmental() :
36  plugin::TableFunction("DATA_DICTIONARY", "ENVIRONMENTAL")
37 {
38  add_field("VARIABLE_NAME", plugin::TableFunction::STRING, LARGEST_ENV_STRING, true);
39  add_field("VARIABLE_VALUE", plugin::TableFunction::STRING, LARGEST_ENV_STRING, false);
40 }
41 
42 utility_dictionary::Environmental::Generator::Generator(drizzled::Field **arg) :
43  drizzled::plugin::TableFunction::Generator(arg),
44  position(0)
45 {
46  position= environ;
47 }
48 
49 bool utility_dictionary::Environmental::Generator::populate()
50 {
51  if (not *position)
52  return false;
53 
54  char *value= NULL;
55  if ((value= strchr(*position, '=')))
56  {
57  value++;
58  }
59 
60  if (value)
61  {
62  std::string substring(*position, 0, (size_t)(value - *position -1)); // The additional -1 is for the =
63  push(substring);
64 
65  substring.assign(value, 0, LARGEST_ENV_STRING);
66  push(substring);
67  }
68  else
69  {
70  std::string substring(*position, 0, LARGEST_ENV_STRING);
71  push(false);
72  }
73 
74  position++;
75 
76  return true;
77 }