[corlib] Support terminals without color support

Some terminals like vt220 don't have a format string for setting foreground or background colors. In that case, the set*color members of the TermInfoDriver are set to null and trying to set the background color throws. Signed-off-by: Kai Ruhnau <[email protected]>
jonpryor · Feb 21, 2018 · d2383c0 · d2383c0
1 parent 705223f
commit d2383c0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/mcs/class/corlib/System/TermInfoDriver.cs b/mcs/class/corlib/System/TermInfoDriver.cs
@@ -391,6 +391,10 @@ public bool IsSpecialKey (char c)
 
 		void ChangeColor (string format, ConsoleColor color)
 		{
+			if (String.IsNullOrEmpty (format))
+				// the terminal doesn't support colors
+				return;
+
 			int ccValue = (int)color;
 			if ((ccValue & ~0xF) != 0)
 				throw new ArgumentException("Invalid Console Color");