wcstoimax, wcstoumax - convert wide-character string to integer
#include <stddef.h>
#include <inttypes.h>
intmax_t wcstoimax(const wchar_t *restrict nptr,
wchar_t **restrict endptr, int base);
uintmax_t wcstoumax(const wchar_t *restrict nptr,
wchar_t **restrict endptr, int base);