77 IO__opencheck(IOobject *self) {  in IO__opencheck()  function
105     if (!IO__opencheck(self)) return NULL;  in IO_flush()
119     if (!IO__opencheck(IOOOBJECT(self))) return NULL;  in IO_cgetval()
131     if (!IO__opencheck(self)) return NULL;  in IO_getval()
151     if (!IO__opencheck(self)) return NULL;  in IO_isatty()
163     if (!IO__opencheck(IOOOBJECT(self))) return -1;  in IO_cread()
201     if (!IO__opencheck(IOOOBJECT(self))) return -1;  in IO_creadline()
286     if (!IO__opencheck(self)) return NULL;  in IO_reset()
299     if (!IO__opencheck(self)) return NULL;  in IO_tell()
312     if (!IO__opencheck(self)) return NULL;  in IO_truncate()
362     if (!IO__opencheck(IOOOBJECT(self))) return NULL;  in IO_seek()
392     if (!IO__opencheck(IOOOBJECT(self))) return -1;  in O_cwrite()