Be entirely consistant when using ioctl(0, TIOCGWINSZ, &winsize)

to ensure proper fallback behavior on, i.e. serial consoles.
 -Erik


git-svn-id: svn://busybox.net/trunk/busybox@7526 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 66 insertions, 0 deletions

diff --git a/libbb/get_terminal_width_height.c b/libbb/get_terminal_width_height.c
new file mode 100644
index 000000000..69f6a17e5
--- /dev/null
+++ b/libbb/get_terminal_width_height.c
@@ -0,0 +1,66 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Determine the width and height of the terminal.
+ *
+ * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include "busybox.h"
+
+/* It is perfectly ok to pass in a NULL for either width or for
+ * height, in which case that value will not be set.  It is also
+ * perfectly ok to have CONFIG_FEATURE_AUTOWIDTH disabled, in 
+ * which case you will always get 80x24 */
+void get_terminal_width_height(int fd, int *width, int *height)
+{
+        struct winsize win = { 0, 0, 0, 0 };
+#ifdef CONFIG_FEATURE_AUTOWIDTH
+        if (ioctl(0, TIOCGWINSZ, &win) != 0) {
+                win.ws_row = 24;
+                win.ws_col = 80;
+        }
+#endif
+        if (win.ws_row <= 1) {
+                win.ws_row = 24;
+        }
+        if (win.ws_col <= 1) {
+                win.ws_col = 80;
+        }
+        if (height) {
+                *height = (int) win.ws_row;
+        }
+        if (width) {
+                *width = (int) win.ws_col;
+        }
+}
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+