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82 lines
2.3 KiB
C++
82 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_left.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
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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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#include "utils_utf8.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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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_left::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_left::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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const string& tstr = fp[0]->data()->getStrVal(row, isNull);
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if (isNull)
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return "";
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size_t strwclen = utf8::idb_mbstowcs(0, tstr.c_str(), 0) + 1;
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wchar_t* wcbuf = (wchar_t*)alloca(strwclen * sizeof(wchar_t));
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strwclen = utf8::idb_mbstowcs(wcbuf, tstr.c_str(), strwclen);
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wstring str(wcbuf, strwclen);
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int64_t pos = fp[1]->data()->getIntVal(row, isNull) - 1;
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if (isNull)
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return "";
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if (pos == -1) // pos == 0
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return "";
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wstring out = str.substr(0, pos+1);
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size_t strmblen = utf8::idb_wcstombs(0, out.c_str(), 0) + 1;
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char* outbuf = (char*)alloca(strmblen * sizeof(char));
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strmblen = utf8::idb_wcstombs(outbuf, out.c_str(), strmblen);
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return string(outbuf, strmblen);
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// return str.substr(0, pos+1);
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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