the begginning

utils/funcexp/func_insert.cpp

@@ -0,0 +1,112 @@
+/* Copyright (C) 2014 InfiniDB, 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 Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/****************************************************************************
+* $Id: func_insert.cpp 2477 2011-04-01 16:07:35Z rdempsey $
+*
+*
+****************************************************************************/
+
+#include <string>
+using namespace std;
+
+#include "functor_str.h"
+#include "functioncolumn.h"
+using namespace execplan;
+
+#include "rowgroup.h"
+using namespace rowgroup;
+
+#include "joblisttypes.h"
+using namespace joblist;
+
+#include "utf8.h"
+using namespace utf8;
+
+#define STRCOLL_ENH__
+
+namespace funcexp
+{
+
+CalpontSystemCatalog::ColType Func_insert::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
+{
+	// operation type is not used by this functor
+	return fp[0]->data()->resultType();
+}
+
+string insertStr(const string& src, int pos, int len, const string& targ)
+{
+	int64_t strLen = static_cast<int64_t>(src.length());
+
+    if ((pos <= 0) || ((pos-1) > strLen))
+        return src;
+
+    if ((len < 0) || (len > strLen))
+        len = strLen;
+
+    const char* srcptr = src.c_str();
+    advance(srcptr,pos-1,srcptr+strLen);
+    // srcptr now pointing to where we need to insert targ string
+
+    uint32_t srcPos = srcptr - src.c_str();
+
+    uint32_t finPos = strLen;
+	const char* finptr = src.c_str();
+    if ((strLen - (pos-1+len)) >= 0)
+    {
+	    advance(finptr,(pos-1+len),finptr+strLen);
+    	// finptr now pointing to the end of the string to replace
+		finPos = finptr - src.c_str();
+    }
+
+    string out;
+    out.reserve(srcPos + targ.length() + strLen-finPos + 1);
+    out.append( src.c_str(), srcPos );
+    out.append( targ.c_str(), targ.length() );
+    out.append( src.c_str() + finPos, strLen-finPos );
+
+    return out;
+}
+
+std::string Func_insert::getStrVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType&)
+{	
+	const string& tstr = stringValue(fp[0], row, isNull);
+	if (isNull)
+		return "";
+
+	const string& tnewstr = stringValue(fp[3], row, isNull);
+	if (isNull)
+		return "";
+
+	int64_t pos = fp[1]->data()->getIntVal(row, isNull);
+	if (isNull)
+		return "";
+
+	int64_t len = fp[2]->data()->getIntVal(row, isNull);
+	if (isNull)
+		return "";
+
+    return insertStr( tstr, pos, len, tnewstr );	
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4:
+