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90 lines
2.3 KiB
C++
90 lines
2.3 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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#define STRCOLL_ENH__
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namespace
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{
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void reverse( char *start, char *end )
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{
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while( start < end )
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{
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char c = *start;
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*start++ = *end;
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*end-- = c;
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}
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}
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}
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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&)
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{
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string str = stringValue(fp[0], row, isNull);
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// We used to reverse in the string buffer, but that doesn't
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// work for all compilers as some re-use the buffer on simple
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// string assignment and implement a ref-count. Reversing in the
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// string buffer has the affect of reversing all strings from
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// which this one derived.
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int len = str.length();
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char* pbuf = new char[len+1];
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strncpy(pbuf, str.c_str(), len);
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pbuf[len] = 0;
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char *end = pbuf+len-1;
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reverse(pbuf, end);
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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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