wcscspn - get length of complementary wide character substring

Syntax	#include <wchar.h> size_t wcscspn(const wchar_t *ws1, const wchar_t *ws2);
Description	Starting at the beginning of the wide character string ws1, wcscspn() calculates the length of the segment that does not contain a single character from the wide character string ws2. The terminating null byte (\0) is not treated as part of the wide character string ws2. The function is terminated and the segment length is returned on encountering a character in ws1 that matches a character in ws2. If the first character in ws1 already matches a character in ws2, the segment length is equal to 0.
Return val.	Integer that indicates the segment length (number of non-matching characters), starting at the beginning of wide character string ws1.
Notes	Restriction This version of the C runtime system only supports 1-byte characters as wide character codes. They are of type wchar_t (see stddef.h). (End)
See also	wcsspn(), wchar.h.