libc.info: wcscspn

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`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.