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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/insert.h>
#include <drizzled/error.h>
#include <drizzled/session.h>
namespace drizzled
{
String *Item_func_insert::val_str(String *str)
{
assert(fixed == 1);
String *res,*res2;
int64_t start, length; /* must be int64_t to avoid truncation */
null_value=0;
res=args[0]->val_str(str);
res2=args[3]->val_str(&tmp_value);
start= args[1]->val_int() - 1;
length= args[2]->val_int();
if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
args[3]->null_value)
goto null;
if ((start < 0) || (start > static_cast<int64_t>(res->length())))
return res; // Wrong param; skip insert
if ((length < 0) || (length > static_cast<int64_t>(res->length())))
length= res->length();
/* start and length are now sufficiently valid to pass to charpos function */
start= res->charpos((int) start);
length= res->charpos((int) length, (uint32_t) start);
/* Re-testing with corrected params */
if (start > static_cast<int64_t>(res->length()))
return res;
if (length > static_cast<int64_t>(res->length()) - start)
length= res->length() - start;
if ((uint64_t) (res->length() - length + res2->length()) >
(uint64_t) 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;
}
res=copy_if_not_alloced(str,res,res->length());
res->replace((uint32_t) start,(uint32_t) length,*res2);
return res;
null:
null_value=1;
return 0;
}
void Item_func_insert::fix_length_and_dec()
{
uint64_t max_result_length;
// Handle character set for args[0] and args[3].
if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 3))
return;
max_result_length= ((uint64_t) args[0]->max_length+
(uint64_t) args[3]->max_length);
if (max_result_length >= MAX_BLOB_WIDTH)
{
max_result_length= MAX_BLOB_WIDTH;
maybe_null= 1;
}
max_length= (ulong) max_result_length;
}
} /* namespace drizzled */
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