Scm_Peekc        1531 src/gauche.h   SCM_EXTERN ScmChar Scm_Peekc(ScmPort *port);
Scm_Peekc        3837 src/stdlib.c     ScmChar ch = Scm_Peekc(port);
Scm_Peekc        2368 src/vm.c                       ch = Scm_Peekc(port);