From 2202ab2599acce12cf90038eaa9d5ce8c626e219 Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 2 Nov 2019 19:04:27 +0100
Subject: [PATCH] mescc: Mes C Library: Add isatty for M2-Planet.

* lib/m2/isatty.c: New file.
---
 lib/m2/isatty.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 lib/m2/isatty.c

diff --git a/lib/m2/isatty.c b/lib/m2/isatty.c
new file mode 100644
index 00000000..cf24b0be
--- /dev/null
+++ b/lib/m2/isatty.c
@@ -0,0 +1,54 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termio.h>
+
+// CONSTANT TCGETS 0x5401
+#define TCGETS 0x5401
+
+// CONSTANT NCCS 19
+#define NCCS 19
+
+struct ktermios
+{
+  unsigned c_iflag;
+  unsigned c_oflag;
+  unsigned c_cflag;
+  unsigned c_lflag;
+  char c_line;
+  char c_cc[NCCS];
+  unsigned c_ispeed;
+  unsigned c_ospeed;
+};
+
+struct ktermios *__isatty_kernel_termios;
+
+int
+isatty (int filedes)
+{
+  if (__isatty_kernel_termios == 0)
+    __isatty_kernel_termios = malloc (sizeof (struct ktermios));
+  int r = ioctl (filedes, TCGETS, __isatty_kernel_termios);
+  return r == 0;
+}