Library /sys$common/syshlp/helplib.hlb  —  CRTL  mbstowcs  Description
    The mbstowcs function converts a sequence of multibyte characters
    from the array pointed to by s to a sequence of wide-character
    codes that are stored into the array pointed to by pwcs, up to a
    maximum of n codes.

    This function is affected by the LC_CTYPE category of the
    program's current locale. If copying takes place between objects
    that overlap, the behavior is undefined.
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