Drizzled Public API Documentation

int_divide.cc

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
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; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #include <config.h>
00021 
00022 #include <drizzled/function/math/int_divide.h>
00023 
00024 namespace drizzled
00025 {
00026 
00027 /* Integer division */
00028 int64_t Item_func_int_div::val_int()
00029 {
00030   assert(fixed == 1);
00031   int64_t value=args[0]->val_int();
00032   int64_t val2=args[1]->val_int();
00033   if ((null_value= (args[0]->null_value || args[1]->null_value)))
00034     return 0;
00035   if (val2 == 0)
00036   {
00037     signal_divide_by_null();
00038     return 0;
00039   }
00040   return (unsigned_flag ?
00041           (int64_t)((uint64_t) value / (uint64_t) val2) :
00042           value / val2);
00043 }
00044 
00045 void Item_func_int_div::fix_length_and_dec()
00046 {
00047   Item_result argtype= args[0]->result_type();
00048   /* use precision ony for the data type it is applicable for and valid */
00049   max_length=args[0]->max_length -
00050     (argtype == DECIMAL_RESULT || argtype == INT_RESULT ?
00051      args[0]->decimals : 0);
00052   maybe_null=1;
00053   unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
00054 }
00055 
00056 } /* namespace drizzled */