Add function cdo_inq_att_string()

src/cdo_cdi_wrapper.cc

 #include <cdi.h>
 #include <cstring>
 #include <cstdlib>
+#include <vector>
 
 #include "cdi_int.h"
 #include "cdo_default_values.h"
@@ -111,6 +112,29 @@ grid_gen_yvals(int gridtype, int ysize, double yfirst, double ylast, double yinc
   gridGenYvals(gridtype, ysize, yfirst, ylast, yinc, yvals);
 }
 
+int
+cdo_inq_att_int(int cdiID, int varID, const std::string &attname)
+{
+  int attint = -1;
+  cdiInqAttInt(cdiID, varID, attname.c_str(), 1, &attint);
+  return attint;
+}
+
+std::string
+cdo_inq_att_string(int cdiID, int varID, const std::string &attname)
+{
+  int attlen = cdiInqAttLen(cdiID, varID, attname.c_str());
+  std::vector<char> atttxt(1, 0);
+  if (attlen > 0)
+    {
+      atttxt.resize(attlen + 1);
+      cdiInqAttTxt(cdiID, varID, attname.c_str(), attlen, atttxt.data());
+      atttxt[attlen] = 0;
+    }
+
+  return std::string(atttxt.data());
+}
+
 std::string
 cdo_inq_key_string(int cdiID, int varID, int key)
 {

src/cdo_cdi_wrapper.h

@@ -20,6 +20,8 @@ void grid_gen_yvals(int gridtype, int ysize, double yfirst, double ylast, double
 
 void cdo_def_table_id(int tableID);
 
+int cdo_inq_att_int(int cdiID, int varID, const std::string &attname);
+std::string cdo_inq_att_string(int cdiID, int varID, const std::string &attname);
 std::string cdo_inq_key_string(int cdiID, int varID, int key);
 std::string cdo_inq_var_name(int vlistID, int varID);
 std::string cdo_inq_var_longname(int vlistID, int varID);