Drizzled Public API Documentation

environmental.cc
00001 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2010 Brian Aker
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 
00023 #include <plugin/utility_dictionary/dictionary.h>
00024 
00025 #include <drizzled/atomics.h>
00026 #include <drizzled/session.h>
00027 
00028 extern char **environ;
00029 
00030 using namespace drizzled;
00031 using namespace std;
00032 
00033 #define LARGEST_ENV_STRING 512
00034 
00035 utility_dictionary::Environmental::Environmental() :
00036   plugin::TableFunction("DATA_DICTIONARY", "ENVIRONMENTAL")
00037 {
00038   add_field("VARIABLE_NAME", plugin::TableFunction::STRING, LARGEST_ENV_STRING, true);
00039   add_field("VARIABLE_VALUE", plugin::TableFunction::STRING, LARGEST_ENV_STRING, false);
00040 }
00041 
00042 utility_dictionary::Environmental::Generator::Generator(drizzled::Field **arg) :
00043   drizzled::plugin::TableFunction::Generator(arg),
00044   position(0)
00045 {
00046   position= environ;
00047 }
00048 
00049 bool utility_dictionary::Environmental::Generator::populate()
00050 {
00051   if (not *position)
00052     return false;
00053 
00054   char *value= NULL;
00055   if ((value= strchr(*position, '=')))
00056   {
00057     value++;
00058   }
00059 
00060   if (value)
00061   {
00062     std::string substring(*position, 0, (size_t)(value - *position -1)); // The additional -1 is for the = 
00063     push(substring);
00064 
00065     substring.assign(value, 0, LARGEST_ENV_STRING);
00066     push(substring);
00067   }
00068   else
00069   {
00070     std::string substring(*position, 0, LARGEST_ENV_STRING);
00071     push(false);
00072   }
00073   
00074   position++;
00075 
00076   return true;
00077 }