JUMP1
#define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
#define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
#define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
#define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
#define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)