Drizzled Public API Documentation

signed.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 <drizzled/charset_info.h>
00024 #include <drizzled/error.h>
00025 #include <drizzled/function/cast/signed.h>
00026 #include <drizzled/lex_string.h>
00027 
00028 namespace drizzled {
00029 namespace function {
00030 namespace cast {
00031 
00032 void Signed::print(String *str)
00033 {
00034   str->append(STRING_WITH_LEN("cast("));
00035   args[0]->print(str);
00036   str->append(STRING_WITH_LEN(" as signed)"));
00037 
00038 }
00039 
00040 
00041 int64_t Signed::val_int()
00042 {
00043   int64_t value;
00044   int error= 0;
00045   char buff[MAX_FIELD_WIDTH];
00046   String res_buffer(buff,sizeof(buff), &my_charset_bin);
00047   String *res;
00048 
00049   if (not (res= args[0]->val_str(&res_buffer)))
00050   { 
00051     null_value= 1; 
00052     error= 0; 
00053 
00054     return 0; 
00055   } 
00056   null_value= 0; 
00057 
00058   char *end= res->ptr() + res->length(); 
00059   value= res->charset()->cset->strntoull10rnd(res->charset(),
00060                                               res->ptr(),
00061                                               res->length(),
00062                                               false, &end, &error);
00063 
00064   if (error or (end != res->ptr() + res->length())) 
00065   {
00066     my_error(ER_INVALID_CAST_TO_SIGNED, MYF(0), res->c_str());
00067   }
00068 
00069   return value;
00070 }
00071 
00072 
00073 } // namespace cast
00074 } // namespace function
00075 } // namespace drizzled