Add non-standard function: _set_ospeed(speed)

Basically all termios+termcap pgms needs it.
It set ospeed variable using nearest-matched stty speeds,
which helps termcap pgms works with non-fixed termios speeds
and not duplicate ospeed switch into every pgm.
Also it isn't standard function, its source code is too big to include it
in whole to every termcap+termios pgm.

1 files changed, 71 insertions, 0 deletions

diff --git a/lib/libtermcap/tospeed.c b/lib/libtermcap/tospeed.c
new file mode 100644
index 0000000..89c37aa
--- /dev/null
+++ b/lib/libtermcap/tospeed.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 1995 by Andrey A. Chernov, Moscow, Russia.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+extern short ospeed;
+
+static struct stable {
+	long speed;
+	short code;
+} table[] = {
+	{115200,17},
+	{57600, 16},
+	{38400, 15},
+	{19200, 14},
+	{9600,  13},
+	{4800,  12},
+	{2400,  11},
+	{1800,  10},
+	{1200,  9},
+	{600,   8},
+	{300,   7},
+	{200,   6},
+	{150,   5},
+	{134,   4},
+	{110,   3},
+	{75,    2},
+	{50,    1},
+	{0,     0},
+	{-1,    -1}
+};
+
+void _set_ospeed(long speed)
+{
+	struct stable *stable;
+
+	if (speed == 0) {
+		ospeed = 0;
+		return;
+	}
+	for (stable = table; stable->speed > 0; stable++) {
+		/* nearest one, rounded down */
+		if (stable->speed <= speed) {
+			ospeed = stable->code;
+			return;
+		}
+	}
+	ospeed = 1;     /* 50, min and not hangup */
+}
+