From c78c138f0f1e0db42115c306e06a6c59f6d5b4bc Mon Sep 17 00:00:00 2001
From: assar <assar@FreeBSD.org>
Date: Sun, 4 Mar 2001 06:04:50 +0000
Subject: implement OCRNL, ONOCR, and ONLRET

Obtained from:	NetBSD
---
 bin/stty/modes.c         |  6 ++++++
 bin/stty/print.c         |  3 +++
 bin/stty/stty.1          | 10 ++++++++++
 share/man/man4/termios.4 | 19 +++++++++++++++++++
 sys/kern/tty.c           | 12 +++++++++++-
 sys/sys/termios.h        |  3 +++
 6 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/bin/stty/modes.c b/bin/stty/modes.c
index b1f333e..f724a537 100644
--- a/bin/stty/modes.c
+++ b/bin/stty/modes.c
@@ -191,10 +191,16 @@ struct modes omodes[] = {
 	{ "-litout",	OPOST, 0 },
 	{ "onlcr",	ONLCR, 0 },
 	{ "-onlcr",	0, ONLCR },
+	{ "ocrnl",	OCRNL, 0 },
+	{ "-ocrnl",	0, OCRNL },
 	{ "tabs",	0, OXTABS },		/* "preserve" tabs */
 	{ "-tabs",	OXTABS, 0 },
 	{ "oxtabs",	OXTABS, 0 },
 	{ "-oxtabs",	0, OXTABS },
+	{ "onocr",	ONOCR, 0 },
+	{ "-onocr",	0, ONOCR },
+	{ "onlret",	ONLRET, 0 },
+	{ "-onlret",	0, ONLRET },
 	{ NULL },
 };
 
diff --git a/bin/stty/print.c b/bin/stty/print.c
index a0149c2..364b95b 100644
--- a/bin/stty/print.c
+++ b/bin/stty/print.c
@@ -148,7 +148,10 @@ print(tp, wp, ldisc, fmt)
 	binit("oflags");
 	put("-opost", OPOST, 1);
 	put("-onlcr", ONLCR, 1);
+	put("-ocrnl", OCRNL, 0);
 	put("-oxtabs", OXTABS, 1);
+	put("-onocr", OXTABS, 0);
+	put("-onlret", OXTABS, 0);
 
 	/* control flags (hardware state) */
 	tmp = tp->c_cflag;
diff --git a/bin/stty/stty.1 b/bin/stty/stty.1
index bf0bcf6..3720fbd 100644
--- a/bin/stty/stty.1
+++ b/bin/stty/stty.1
@@ -237,8 +237,18 @@ Map (do not map)
 to
 .Dv CR-NL
 on output.
+.It Cm ocrnl Pq Fl ocrnl
+Map (do not map)
+.Dv CR
+to
+.Dv NL
+on output.
 .It Cm oxtabs Pq Fl oxtabs
 Expand (do not expand) tabs to spaces on output.
+.It Cm onocr Pq Fl onocr
+Do not (do) output CRs at column zero.
+.It Cm onlret Pq Fl onlret
+On the terminal NL performs (does not perform) the CR function.
 .El
 .Ss Local Modes:
 .Pp
diff --git a/share/man/man4/termios.4 b/share/man/man4/termios.4
index 773ee24..3d8a534 100644
--- a/share/man/man4/termios.4
+++ b/share/man/man4/termios.4
@@ -994,6 +994,8 @@ and are composed of the following masks:
 /* map NL to CR-NL (ala
 .Dv CRMOD )
 */
+.It Dv OCRNL
+/* map CR to NL */
 .It Dv OXTABS
 /* expand tabs to spaces */
 .It Dv ONOEOT
@@ -1001,6 +1003,10 @@ and are composed of the following masks:
 .Dv EOT Ns 's
 .Ql \&^D
 on output) */
+.It Dv ONOCR
+/* do not transmit CRs on column 0 */
+.It Dv ONLRET
+/* on the termianl NL performs the CR function */
 .El
 .Pp
 If
@@ -1013,6 +1019,10 @@ If
 is set, newlines are translated to carriage return, linefeeds.
 .Pp
 If
+.Dv OCRNL
+is set, carriage returns are translated to newlines.
+.Pp
+If
 .Dv OXTABS
 is set, tabs are expanded to the appropriate number of
 spaces (assuming 8 column tab stops).
@@ -1023,6 +1033,15 @@ is set,
 .Tn ASCII
 .Dv EOT Ns 's
 are discarded on output.
+.Pp
+If
+.Dv ONOCR
+is set, no CR character is transmitted when at column 0 (first position).
+.Pp
+If
+.Dv ONLRET
+is set, the NL character is assumed to do the carriage-return function;
+the column pointer will be set to 0.
 .Ss Control Modes
 Values of the
 .Fa c_cflag
diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index 1bc30ca..a7ba12d 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -667,9 +667,16 @@ ttyoutput(c, tp)
 	if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
 		tk_nout++;
 		tp->t_outcc++;
-		if (putc('\r', &tp->t_outq))
+		if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
 			return (c);
 	}
+	/* If OCRNL is set, translate "\r" into "\n". */
+	else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
+		c = '\n';
+	/* If ONOCR is set, don't transmit CRs when on column 0. */
+	else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
+		return (-1);
+
 	tk_nout++;
 	tp->t_outcc++;
 	if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
@@ -684,6 +691,9 @@ ttyoutput(c, tp)
 	case CONTROL:
 		break;
 	case NEWLINE:
+		if (ISSET(tp->t_oflag, ONLCR | ONLRET))
+			col = 0;
+		break;
 	case RETURN:
 		col = 0;
 		break;
diff --git a/sys/sys/termios.h b/sys/sys/termios.h
index 6111fc3..7e7643f 100644
--- a/sys/sys/termios.h
+++ b/sys/sys/termios.h
@@ -112,6 +112,9 @@
 #define ONLCR		0x00000002	/* map NL to CR-NL (ala CRMOD) */
 #define OXTABS		0x00000004	/* expand tabs to spaces */
 #define ONOEOT		0x00000008	/* discard EOT's (^D) on output) */
+#define OCRNL		0x00000010	/* map CR to NL on output */
+#define ONOCR		0x00000020	/* no CR output at column 0 */
+#define ONLRET		0x00000040	/* NL performs CR function */
 #endif  /*_POSIX_SOURCE */
 
 /*
-- 
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