gen_zaxis_height: change type of units to std::string.

src/cdo_zaxis.cc

@@ -304,19 +304,19 @@ gen_zaxis_height(ZaxisDesciption &zaxis, const char *pline)
           if (*pline == '_') pline++;
 
           if (*pline == 0) return;
-          const char *units = pline;
+          std::string units = pline;
 
           zaxis.type = zaxistype;
           zaxis.size = 1;
           // zaxis.scalar = true;
           zaxis.vals.resize(1);
           zaxis.vals[0] = value;
-          strcpy(zaxis.units, units);
+          zaxis.units = units;
 
-          auto len = strlen(units);
+          auto len = units.size();
           if (len > 2 && units[len - 2] == '_' && units[len - 1] == 's')
             {
-              zaxis.units[len - 2] = 0;
+              zaxis.units.resize(len - 2);
               zaxis.scalar = true;
             }
         }