Port programming more clearly, easy to understand. I feel pretty good. For your reference

apue.h
csize.c
ctermid.c
freebsd.mk
getpass.c
isatty.c
linux.mk
macos.mk
settty.c
solaris.mk
ttyname.c
t_getpass.c
t_isatty.c
t_raw.c
t_ttyname.c
winch.c

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