Move headers from server/include to include/maxscale

- Headers now to be included as <maxscale/xyz.h>
- First step, no cleanup of headers has been made. Only moving
  from one place to another + necessary modifications.

include/maxscale/resultset.h

@@ -0,0 +1,88 @@
+#ifndef _RESULTSET_H
+#define _RESULTSET_H
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl.
+ *
+ * Change Date: 2019-07-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+/**
+ * @file resultset.h The MaxScale generic result set mechanism
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date         Who             Description
+ * 17/02/15     Mark Riddoch    Initial implementation
+ *
+ * @endverbatim
+ */
+#include <maxscale/dcb.h>
+
+
+/**
+ * Column types
+ */
+typedef enum
+{
+    COL_TYPE_VARCHAR = 0x0f,
+    COL_TYPE_VARSTRING = 0xfd
+} RESULT_COL_TYPE;
+
+/**
+ * The result set column definition. Each result set has an order linked
+ * list of column definitions.
+ */
+typedef struct resultcolumn
+{
+    char *name;                /*< Column name */
+    int len;                   /*< Column length */
+    RESULT_COL_TYPE type;      /*< Column type */
+    struct resultcolumn *next; /*< next column */
+} RESULT_COLUMN;
+
+/**
+ * A representation of a row within a result set.
+ */
+typedef struct resultrow
+{
+    int n_cols; /*< No. of columns in row */
+    char **cols; /*< The columns themselves */
+} RESULT_ROW;
+
+struct resultset;
+
+/**
+ * Type of callback function used to supply each row
+ */
+typedef RESULT_ROW * (*RESULT_ROW_CB)(struct resultset *, void *);
+
+/**
+ * The representation of the result set itself.
+ */
+typedef struct resultset
+{
+    int n_cols;             /*< No. of columns */
+    RESULT_COLUMN *column;  /*< Linked list of column definitions */
+    RESULT_ROW_CB fetchrow; /*< Fetch a row for the result set */
+    void *userdata;         /*< User data for the fetch row call */
+} RESULTSET;
+
+extern RESULTSET *resultset_create(RESULT_ROW_CB, void *);
+extern void resultset_free(RESULTSET *);
+extern int resultset_add_column(RESULTSET *, const char *, int, RESULT_COL_TYPE);
+extern void resultset_column_free(RESULT_COLUMN *);
+extern RESULT_ROW *resultset_make_row(RESULTSET *);
+extern void resultset_free_row(RESULT_ROW *);
+extern int resultset_row_set(RESULT_ROW *, int, const char *);
+extern void resultset_stream_mysql(RESULTSET *, DCB *);
+extern void resultset_stream_json(RESULTSET *, DCB *);
+
+#endif