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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* 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
*/
#include <config.h>
#include <drizzled/charset.h>
#include <drizzled/function/find_in_set.h>
/* Search after a string in a string of strings separated by ',' */
/* Returns number of found type >= 1 or 0 if not found */
/* This optimizes searching in enums to bit testing! */
namespace drizzled
{
void Item_func_find_in_set::fix_length_and_dec()
{
decimals=0;
max_length=3; // 1-999
agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
}
static const char separator=',';
int64_t Item_func_find_in_set::val_int()
{
assert(fixed == 1);
if (enum_value)
{
uint64_t tmp=(uint64_t) args[1]->val_int();
if (!(null_value=args[1]->null_value || args[0]->null_value))
{
if (tmp & enum_bit)
return enum_value;
}
return 0L;
}
String *find=args[0]->val_str(&value);
String *buffer=args[1]->val_str(&value2);
if (!find || !buffer)
{
null_value=1;
return 0;
}
null_value=0;
if (buffer->length() >= find->length())
{
my_wc_t wc;
const charset_info_st * const cs= cmp_collation.collation;
const char *str_begin= buffer->ptr();
const char *str_end= buffer->ptr();
const char *real_end= str_end+buffer->length();
const unsigned char *find_str= (const unsigned char *) find->ptr();
uint32_t find_str_len= find->length();
int position= 0;
while (1)
{
int symbol_len;
if ((symbol_len= cs->cset->mb_wc(cs, &wc, (unsigned char*) str_end, (unsigned char*) real_end)) > 0)
{
const char *substr_end= str_end + symbol_len;
bool is_last_item= (substr_end == real_end);
bool is_separator= (wc == (my_wc_t) separator);
if (is_separator || is_last_item)
{
position++;
if (is_last_item && !is_separator)
str_end= substr_end;
if (!my_strnncoll(cs, (const unsigned char *) str_begin,
str_end - str_begin,
find_str, find_str_len))
return (int64_t) position;
else
str_begin= substr_end;
}
str_end= substr_end;
}
else if (str_end - str_begin == 0 &&
find_str_len == 0 &&
wc == (my_wc_t) separator)
return (int64_t) ++position;
else
return 0;
}
}
return 0;
}
} /* namespace drizzled */
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