get length of complementary wide substring
size_t wcscspn(const wchar_t *ws1, const wchar_t *ws2);
wcscspn determines the length of the maximum initial segment of the
wide string pointed to by ws1. This string consists entirely of
wide characters not included in the string pointed to by ws2.
wcscspn returns the length of the segment.
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UnixWare 7 Release 7.1.4 - 25 April 2004