Shell freezes and infinite loops

[SamuelMarks]

$ ./ddsh 
[dingdong shell]# 5
unexpected token 5
unexpected token 5
unexpected token 5
unexpected token 
unexpected token 5
unexpected token 5
unexpected token 5
unexpected token 5
unexpected token 5
unexpected token 5
unexpected token 5
unex^Cunexpected token 5
unexpected token 5

$ ./ddsh 
[dingdong shell]# ls
ddsh: ls: command not found
Journal  Makefile  README.md  ddsh  include  obj  src
[dingdong shell]# ls | wc -l