From fbdf121b7da7fa78160f7c35ea7c4b3ed2f307d4 Mon Sep 17 00:00:00 2001
From: Rob Landley
Date: Wed, 20 Sep 2006 22:06:01 +0000
Subject: Teach get_terminal_width_height to fall back to $LINES and $COLUMNS
 when used via things like a serial console.

---
 libbb/xfuncs.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'libbb/xfuncs.c')

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index d77bf38..92091e5 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -6,7 +6,7 @@
  * Copyright (C) 2006 Rob Landley
  * Copyright (C) 2006 Denis Vlasenko
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  */
 
 #include "busybox.h"
@@ -494,3 +494,26 @@ void xstat(char *name, struct stat *stat_buf)
 }
 #endif
 
+#ifdef L_get_terminal_width_height
+/* It is perfectly ok to pass in a NULL for either width or for
+ *  * height, in which case that value will not be set.  */
+int get_terminal_width_height(int fd, int *width, int *height)
+{
+	struct winsize win = { 0, 0, 0, 0 };
+	int ret = ioctl(fd, TIOCGWINSZ, &win);
+	if (!win.ws_row) {
+		char *s = getenv("LINES");
+		if (s) win.ws_row = atoi(s);
+	}
+	if (win.ws_row <= 1) win.ws_row = 24;
+	if (!win.ws_col) {
+		char *s = getenv("COLUMNS");
+		if (s) win.ws_col = atoi(s);
+	}
+	if (win.ws_col <= 1) win.ws_col = 80;
+	if (height) *height = (int) win.ws_row;
+	if (width) *width = (int) win.ws_col;
+
+	return ret;
+}
+#endif
-- 
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