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6.24 wcsspn—get length of a wide substring

Synopsis 

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

Description
The wcsspn 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 from the wide-character string pointed to by set.
Returns
The wcsspn() function returns the length s1; no return value is reserved to indicate an error.
Portability
wcsspn is ISO/IEC 9899/AMD1:1995 (ISO C).

No supporting OS subroutines are required.