Research V6 development

Research V6 development
Work on file usr/source/iolib/cgetc.c
Work on file usr/source/iolib/cflush.c
Work on file usr/source/iolib/cfree.c
Work on file usr/source/iolib/cerror.c
Work on file usr/source/iolib/cexit.c
Work on file usr/source/iolib/cclose.c
Work on file usr/source/iolib/calloc.c
Work on file usr/source/iolib/alloc.c
Work on file usr/source/iolib/ceof.c
Work on file usr/source/iolib/puts.c
Work on file usr/source/iolib/gets.c
Work on file usr/source/iolib/copen.c
Work on file usr/source/iolib/clenf.c
Work on file usr/source/iolib/iehzap.c
Work on file usr/source/iolib/nexch.c
Work on file usr/source/iolib/revput.c
Work on file usr/source/iolib/maktab.c
Work on file usr/source/iolib/dummy.s
Work on file usr/source/iolib/makbuf.c
Work on file usr/source/iolib/relvec.c
Work on file usr/source/iolib/nodig.c
Work on file usr/source/iolib/cwrd.c
Work on file usr/source/iolib/getch.c
Work on file usr/source/iolib/ftoa.c
Work on file usr/source/iolib/printf.c
Work on file usr/source/iolib/getvec.c
Work on file usr/source/iolib/ciodec.c
Work on file usr/source/iolib/cputc.c
Work on file usr/source/iolib/putch.c
Work on file usr/source/iolib/scan1.c
Work on file usr/source/iolib/wdleng.c
Work on file usr/source/iolib/system.c
Work on file usr/source/iolib/scan2.c
Work on file usr/source/iolib/tmpnam.c
Work on file usr/source/iolib/unprnt.s
Work on file usr/source/iolib/scan3.c
Work on file usr/source/iolib/unget.c

Synthesized-from: v6