WJUMP1
#define _IO_WFINISH(FP) WJUMP1 (__finish, FP, 0)
#define _IO_WOVERFLOW(FP, CH) WJUMP1 (__overflow, FP, CH)
#define _IO_WPBACKFAIL(FP, CH) WJUMP1 (__pbackfail, FP, CH)
#define _IO_WSYSSTAT(FP, BUF) WJUMP1 (__stat, FP, BUF)
#define _IO_WIMBUE(FP, LOCALE) WJUMP1 (__imbue, FP, LOCALE)