/sys$common/syshlp/helplib.hlb CC, Run-time functions, decc$validate_wchar  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Validates its argument as a valid wide character in the current
  program's locale.

  Syntax:

        #include <wchar.h>

        int decc$validate_wchar(wchar_t wc);