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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/function/str/replace.h>
#include <drizzled/error.h>
#include <drizzled/session.h>
#include <drizzled/system_variables.h>
namespace drizzled {
/**
Replace all occurences of string2 in string1 with string3.
Don't reallocate val_str() if not needed.
@todo
Fix that this works with binary strings
*/
String *Item_func_replace::val_str(String *str)
{
assert(fixed == 1);
String *res,*res2,*res3;
int offset;
uint32_t from_length,to_length;
bool alloced=0;
const char *ptr,*end,*strend,*search,*search_end;
uint32_t l;
bool binary_cmp;
null_value=0;
res=args[0]->val_str(str);
if (args[0]->null_value)
goto null;
res2=args[1]->val_str(&tmp_value);
if (args[1]->null_value)
goto null;
res->set_charset(collation.collation);
binary_cmp = ((res->charset()->state & MY_CS_BINSORT) || !use_mb(res->charset()));
if (res2->length() == 0)
return res;
offset=0;
if (binary_cmp && (offset=res->strstr(*res2)) < 0)
return res;
if (!(res3=args[2]->val_str(&tmp_value2)))
goto null;
from_length= res2->length();
to_length= res3->length();
if (!binary_cmp)
{
search=res2->ptr();
search_end=search+from_length;
redo:
ptr=res->ptr()+offset;
strend=res->ptr()+res->length();
end=strend-from_length+1;
while (ptr < end)
{
if (*ptr == *search)
{
char *i,*j;
i=(char*) ptr+1; j=(char*) search+1;
while (j != search_end)
if (*i++ != *j++) goto skip;
offset= (int) (ptr-res->ptr());
if (res->length()-from_length + to_length >
session.variables.max_allowed_packet)
{
push_warning_printf(&session, DRIZZLE_ERROR::WARN_LEVEL_WARN,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
func_name(),
session.variables.max_allowed_packet);
goto null;
}
if (!alloced)
{
alloced=1;
res=copy_if_not_alloced(str,res,res->length()+to_length);
}
res->replace((uint) offset,from_length,*res3);
offset+=(int) to_length;
goto redo;
}
skip:
if ((l=my_ismbchar(res->charset(), ptr,strend))) ptr+=l;
else ++ptr;
}
}
else
do
{
if (res->length()-from_length + to_length >
session.variables.max_allowed_packet)
{
push_warning_printf(&session, DRIZZLE_ERROR::WARN_LEVEL_WARN,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
session.variables.max_allowed_packet);
goto null;
}
if (!alloced)
{
alloced=1;
res=copy_if_not_alloced(str,res,res->length()+to_length);
}
res->replace((uint) offset,from_length,*res3);
offset+=(int) to_length;
}
while ((offset=res->strstr(*res2,(uint) offset)) >= 0);
return res;
null:
null_value=1;
return 0;
}
void Item_func_replace::fix_length_and_dec()
{
uint64_t max_result_length= args[0]->max_length;
int diff=(int) (args[2]->max_length - args[1]->max_length);
if (diff > 0 && args[1]->max_length)
{ // Calculate of maxreplaces
uint64_t max_substrs= max_result_length/args[1]->max_length;
max_result_length+= max_substrs * (uint) diff;
}
if (max_result_length >= MAX_BLOB_WIDTH)
{
max_result_length= MAX_BLOB_WIDTH;
maybe_null= 1;
}
max_length= (ulong) max_result_length;
if (agg_arg_charsets(collation, args, 3, MY_COLL_CMP_CONV, 1))
return;
}
} /* namespace drizzled */
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