_IO_vsscanf
extern int _IO_vsscanf (const char *, const char *, _IO_va_list) __THROW;
weak_alias (_IO_vsscanf, __vsscanf)
weak_alias (_IO_vsscanf, vsscanf)
#define __vsscanf(s, f, a) _IO_vsscanf (s, f, a)