Add a new libc function: cfmakesane(3).

I've noticed various terminal emulators that need to obtain a sane
default termios structure use very complex `hacks'. Even though POSIX
doesn't provide any functionality for this, extend our termios API with
cfmakesane(3), which is similar to the commonly supported cfmakeraw(3),
except that it fills the termios structure with sane defaults.

Change all code in our base system to use this function, instead of
depending on <sys/ttydefaults.h> to provide TTYDEF_*.

1 files changed, 6 insertions, 5 deletions

diff --git a/bin/stty/key.c b/bin/stty/key.c
index 413f4d5..1241301 100644
--- a/bin/stty/key.c
+++ b/bin/stty/key.c
@@ -257,14 +257,15 @@ f_rows(struct info *ip)
 void
 f_sane(struct info *ip)
 {
+	struct termios def;
 
-	ip->t.c_cflag = TTYDEF_CFLAG | (ip->t.c_cflag & CLOCAL);
-	ip->t.c_iflag = TTYDEF_IFLAG;
-	ip->t.c_iflag |= ICRNL;
+	cfmakesane(&def);
+	ip->t.c_cflag = def.c_cflag | (ip->t.c_cflag & CLOCAL);
+	ip->t.c_iflag = def.c_iflag;
 	/* preserve user-preference flags in lflag */
 #define	LKEEP	(ECHOKE|ECHOE|ECHOK|ECHOPRT|ECHOCTL|ALTWERASE|TOSTOP|NOFLSH)
-	ip->t.c_lflag = TTYDEF_LFLAG | (ip->t.c_lflag & LKEEP);
-	ip->t.c_oflag = TTYDEF_OFLAG;
+	ip->t.c_lflag = def.c_lflag | (ip->t.c_lflag & LKEEP);
+	ip->t.c_oflag = def.c_oflag;
 	ip->set = 1;
 }