Drizzled Public API Documentation

unsigned.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/unsigned.h>
00026 #include <drizzled/lex_string.h>
00027 
00028 namespace drizzled {
00029 namespace function {
00030 namespace cast {
00031 
00032 void Unsigned::print(String *str)
00033 {
00034   str->append(STRING_WITH_LEN("cast("));
00035   args[0]->print(str);
00036   str->append(STRING_WITH_LEN(" as unsigned)"));
00037 
00038 }
00039 
00040 
00041 int64_t Unsigned::val_int()
00042 {
00043   int64_t value= 0;
00044   int error= 0;
00045   char buff[MAX_FIELD_WIDTH];
00046   String tmp(buff,sizeof(buff), &my_charset_bin), *res; 
00047 
00048   /* 
00049     For a string result, we must first get the string and then convert it 
00050     to a longlong 
00051    */ 
00052 
00053   if (not (res= args[0]->val_str(&tmp))) 
00054   { 
00055     null_value= true; 
00056     error= 0; 
00057     return 0; 
00058   } 
00059   null_value= false; 
00060 
00061   char *end= res->ptr() + res->length(); 
00062 
00063   if (res->length() and ((char *)res->ptr())[0] == '-')
00064   {
00065     error= -1;
00066   }
00067   else
00068   {
00069     value= res->charset()->cset->strntoull10rnd(res->charset(),
00070                                                 res->ptr(),
00071                                                 res->length(),
00072                                                 true, &end, &error);
00073   }
00074 
00075   if (error or (end != res->ptr() + res->length())) 
00076   {
00077     my_error(ER_INVALID_CAST_TO_UNSIGNED, MYF(0), res->c_str());
00078   }
00079 
00080   return value;
00081 }
00082 
00083 } // namespace cast
00084 } // namespace function
00085 } // namespace drizzled