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104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/****************************************************************************
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* $Id: func_reverse.cpp 2477 2011-04-01 16:07:35Z rdempsey $
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*
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*
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****************************************************************************/
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#include <string>
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using namespace std;
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#include "functor_str.h"
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#include "functioncolumn.h"
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using namespace execplan;
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#include "rowgroup.h"
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using namespace rowgroup;
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#include "joblisttypes.h"
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using namespace joblist;
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#include "collation.h"
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#include <mariadb.h> // DBUG_ASSERT
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_reverse::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
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{
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// operation type is not used by this functor
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return fp[0]->data()->resultType();
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}
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std::string Func_reverse::getStrVal(rowgroup::Row& row,
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FunctionParm& fp,
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bool& isNull,
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execplan::CalpontSystemCatalog::ColType& type)
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{
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CHARSET_INFO* cs = type.getCharset();
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string str;
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stringValue(fp[0], row, isNull, str);
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if (isNull)
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return "";
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if (str.empty() || str.length() == 0)
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return str;
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// binLen represents the number of bytes in str
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size_t binLen = str.length();
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const char* pos = str.c_str();
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const char* end = pos + binLen;
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char* pbuf = new char[binLen + 1];
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pbuf[binLen] = 0;
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char* tmp = pbuf + binLen;
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if (cs->use_mb()) // uses multi-byte characters
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{
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uint32 l;
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while (pos < end)
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{
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if ((l = my_ismbchar(cs, pos, end)))
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{
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tmp -= l;
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DBUG_ASSERT(tmp >= pbuf);
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memcpy(tmp, pos, l);
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pos += l;
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}
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else
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{
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*--tmp= *pos++;
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}
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}
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}
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else
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{
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while (pos < end)
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*--tmp= *pos++;
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}
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string rstr = pbuf;
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delete [] pbuf;
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return rstr;
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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