$ csi -version

CHICKEN
(c) 2008-2014, The CHICKEN Team
(c) 2000-2007, Felix L. Winkelmann
Version 4.9.1 (rev d143e6e)
linux-unix-gnu-x86-64 [ 64bit manyargs dload ptables ]
compiled 2014-10-19 on capsaicin (Linux)

$ printf "foo\rbar" | csi -p '(read-line)'
foo
$ printf "foo\rbar" | csi -R r7rs -p '(read-line)'
foo