~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2006 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

/**

  @file

  @brief

  This file defines all string functions

  @warning

    Some string functions don't always put and end-null on a String.

    (This shouldn't be needed)

*/

#include <config.h>

#include <zlib.h>

#include <drizzled/query_id.h>

#include <drizzled/error.h>

#include <drizzled/function/str/strfunc.h>

using namespace std;

namespace drizzled

{

Item_str_func::~Item_str_func() {}

bool Item_str_func::fix_fields(Session *session, Item **ref)

{

  bool res= Item_func::fix_fields(session, ref);

  /*

    In Item_str_func::check_well_formed_result() we may set null_value

    flag on the same condition as in test() below.

  */

  maybe_null= (maybe_null || true);

  return res;

}

type::Decimal *Item_str_func::val_decimal(type::Decimal *decimal_value)

{

  assert(fixed == 1);

  char buff[64];

  String *res, tmp(buff,sizeof(buff), &my_charset_bin);

  res= val_str(&tmp);

  if (not res)

    return 0;

  (void)decimal_value->store(E_DEC_FATAL_ERROR, (char*) res->ptr(), res->length(), res->charset());

  return decimal_value;

}

double Item_str_func::val_real()

{

  assert(fixed == 1);

  int err_not_used;

  char *end_not_used, buff[64];

  String *res, tmp(buff,sizeof(buff), &my_charset_bin);

  res= val_str(&tmp);

  return res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),

			  &end_not_used, &err_not_used) : 0.0;

}

int64_t Item_str_func::val_int()

{

  assert(fixed == 1);

  int err;

  char buff[DECIMAL_LONGLONG_DIGITS];

  String *res, tmp(buff,sizeof(buff), &my_charset_bin);

  res= val_str(&tmp);

  return (res ?

	  my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL,

		      &err) :

	  (int64_t) 0);

}

void Item_str_func::left_right_max_length()

{

  max_length=args[0]->max_length;

  if (args[1]->const_item())

  {

    int length=(int) args[1]->val_int()*collation.collation->mbmaxlen;

    if (length <= 0)

      max_length=0;

    else

      set_if_smaller(max_length,(uint) length);

  }

}

DRIZZLED_API String my_empty_string("",default_charset_info);

} /* namespace drizzled */