SWI-Prolog -- API-function PL_atom

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Analysing Terms via the Foreign Interface
        
        Wide-character versions
        
        PL_new_atom_wchars()
        
        PL_atom_wchars()
        
        PL_get_wchars()
        
        PL_put_wchars()
        
        PL_unify_wchars()
        
        PL_unify_wchars_diff()
- Packages

Availability:C-language interface function

const pl_wchar_t* PL_atom_wchars(atom_t atom, size_t *len)

Extract characters from a wide-character atom. Succeeds on any atom marked as‘text’. If the underlying atom is a wide-character atom, the returned pointer is a pointer into the atom structure. If the atom is represented as an ISO-Latin-1 string, the returned pointer comes from Prolog's‘buffer stack’(see section 12.4.14).