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

  Determines the number of printing positions on a display device
  that are required for a wide-character string.

  Syntax:

       #include <wchar.h>

       int wcswidth (const wchar_t *pwcs, size_t n);