libc.info: wcsspn

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`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.