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6.12 wcscspn—get length of a complementary wide substring

Synopsis 

     #include <wchar.h>
     size_t wcscspn(const wchar_t *s, wchar_t *set);

Description
The wcscspn function computes the length of the maximum initial segment of the wide-character string pointed to by s which consists entirely of wide-character codes not from the wide-character string pointed to by set.
Returns
The wcscspn function returns the length of the initial substring of s1; no return value is reserved to indicate an error.
Portability
wcscspn is ISO/IEC 9899/AMD1:1995 (ISO C).

No supporting OS subroutines are required.