From 7e61f5e4c514a233250442263b62d887c9e5ca9c Mon Sep 17 00:00:00 2001
From: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Mon, 17 Aug 2015 11:25:38 +0200
Subject: [PATCH] Do not mark as invalid UTF8 control codes

wcwidth() returns -1 for all the non visible characters, but it doesn't
necessarilly mean that they are incorrect. It only means that they are not
printable.
---
 st.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/st.c b/st.c
index 1df4fde..35a840b 100644
--- a/st.c
+++ b/st.c
@@ -2895,15 +2895,15 @@ tputc(Rune u)
 	int width, len;
 	Glyph *gp;
 
+	control = ISCONTROL(u);
 	len = utf8encode(u, c);
-	if ((width = wcwidth(u)) == -1) {
+	if (!control && (width = wcwidth(u)) == -1) {
 		memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
 		width = 1;
 	}
 
 	if (IS_SET(MODE_PRINT))
 		tprinter(c, len);
-	control = ISCONTROL(u);
 
 	/*
 	 * STR sequence must be checked before anything else
--
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