first commit for openGauss connect odbc code

tuple.c

@@ -0,0 +1,71 @@
+/*-------
+ * Module:			tuple.c
+ *
+ * Description:		This module contains functions for setting the data
+ *					for individual fields (TupleField structure) of a
+ *					manual result set.
+ *
+ * Important Note:	These functions are ONLY used in building manual
+ *					result sets for info functions (SQLTables,
+ *					SQLColumns, etc.)
+ *
+ * Classes:			n/a
+ *
+ * API functions:	none
+ *
+ * Comments:		See "readme.txt" for copyright and license information.
+ *-------
+ */
+
+#include "tuple.h"
+#include "misc.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+
+void
+set_tuplefield_null(TupleField *tuple_field)
+{
+	tuple_field->len = 0;
+	tuple_field->value = NULL;	/* strdup(""); */
+}
+
+
+void
+set_tuplefield_string(TupleField *tuple_field, const char *string)
+{
+	if (string)
+	{
+		tuple_field->len = (Int4) strlen(string); /* PG restriction */
+		tuple_field->value = strdup(string);
+	}
+	if (!tuple_field->value)
+		set_tuplefield_null(tuple_field);
+}
+
+
+void
+set_tuplefield_int2(TupleField *tuple_field, Int2 value)
+{
+	char		buffer[10];
+
+	ITOA_FIXED(buffer, value);
+
+	tuple_field->len = (Int4) (strlen(buffer) + 1);
+	/* +1 ... is this correct (better be on the save side-...) */
+	tuple_field->value = strdup(buffer);
+}
+
+
+void
+set_tuplefield_int4(TupleField *tuple_field, Int4 value)
+{
+	char		buffer[15];
+
+	ITOA_FIXED(buffer, value);
+
+	tuple_field->len = (Int4) (strlen(buffer) + 1);
+	/* +1 ... is this correct (better be on the save side-...) */
+	tuple_field->value = strdup(buffer);
+}