Library /sys$common/syshlp/helplib.hlb  —  CRTL  wcscspn  Arguments
 wstr1

    A pointer to a null-terminated wide-character string. If this is
    a null string, 0 is returned.

 wstr2

    A pointer to a null-terminated wide-character string that
    contains the set of wide characters for which the function will
    search.
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