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

  Returns the number of multibyte characters in a multibyte character
  sequence.

  Syntax:

        #include <wchar.h>

        size_t mbrlen (const char *s, size_t n, mbstate_t *ps);