Description

   The decc$feature_get_index function looks up the string passed
   as name in the list of supported features. If the name is found,
   decc$feature_get_index returns a (nonnegative) index that can
   be used to set or retrieve the values for the feature. The
   comparison for name is case insensitive.

   On error, -1 is returned and errno is set to indicate the error.

   See also decc$feature_get, decc$feature_get_value, decc$feature_
   get_name, decc$feature_set, decc$feature_set_value, decc$feature_
   show, and decc$feature_show_all.