_findbuf
extern Uchar *_findbuf(FILE *iop);
if (_findbuf(fp) == NULL) {
if (_findbuf(iop) == 0)
if ((endbuf = _findbuf(iop)) == 0) {
if (iop->_base == NULL && _findbuf(iop) == NULL)
if ((bufend = _findbuf(iop)) == NULL) {
if ((bufend = _findbuf(stdin)) == 0) {
if (_findbuf(iop) == 0)
extern Uchar *_findbuf(FILE *iop);
if (iop->_base == 0 && _findbuf(iop) == 0)