mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-20 09:07:44 +03:00
3919c541ac
* Fix clang warnings * Remove vim tab guides * initialize variables * 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length * Fix ISO C++17 does not allow 'register' storage class specifier for outdated bison * chars are unsigned on ARM, having if (ival < 0) always false * chars are unsigned by default on ARM and comparison with -1 if always true
96 lines
2.8 KiB
C++
96 lines
2.8 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_ltrim.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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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_ltrim::operationType(FunctionParm& fp,
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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_ltrim::getStrVal(rowgroup::Row& row, FunctionParm& fp, 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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// The original string
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const string& src = fp[0]->data()->getStrVal(row, isNull);
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if (isNull)
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return "";
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if (src.empty() || src.length() == 0)
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return src;
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// binLen represents the number of bytes in src
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size_t binLen = src.length();
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const char* pos = src.c_str();
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const char* end = pos + binLen;
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// strLen = the number of characters in src
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size_t strLen = cs->numchars(pos, end);
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// The trim characters.
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const string& trim = (fp.size() > 1 ? fp[1]->data()->getStrVal(row, isNull) : " ");
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// binTLen represents the number of bytes in trim
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size_t binTLen = trim.length();
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const char* posT = trim.c_str();
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// strTLen = the number of characters in trim
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size_t strTLen = cs->numchars(posT, posT + binTLen);
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if (strTLen == 0 || strTLen > strLen)
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return src;
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if (binTLen == 1)
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{
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// If the trim string is 1 byte, don't waste cpu for memcmp
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while (pos < end && *pos == *posT)
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{
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++pos;
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--binLen;
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}
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}
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else
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{
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while (pos + binTLen <= end && memcmp(pos, posT, binTLen) == 0)
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{
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pos += binTLen;
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binLen -= binTLen;
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}
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}
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// Turn back to a string
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std::string ret(pos, binLen);
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return ret;
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}
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} // namespace funcexp
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