From: noname <noname@inventati.org>
Date: Tue, 22 Apr 2014 20:26:07 +0000 (+0400)
Subject: Fix techo handling of control and multibyte characters.
X-Git-Url: https://git.owens.tech/assets/lich_lifts_title_slice.png%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%A0%22Lich%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%8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Fix techo handling of control and multibyte characters.

techo compares signed char to '\x20'. Any character with code less then
'\x20' is treated as control character.  This way characters with MSB
set to 1 are considered control characters too.

Also this patch makes techo display DEL character as ^?.

To reprocuce the bug, enable echo mode using printf '\e[12l',
then type DEL character or any non-ASCII character.
---

diff --git a/st.c b/st.c
index aba034f..b66791a 100644
--- a/st.c
+++ b/st.c
@@ -2308,9 +2308,9 @@ techo(char *buf, int len) {
 	for(; len > 0; buf++, len--) {
 		char c = *buf;
 
-		if(c < '\x20') { /* control code */
+		if(c < 0x20 || c == 0177) { /* control code */
 			if(c != '\n' && c != '\r' && c != '\t') {
-				c |= '\x40';
+				c ^= '\x40';
 				tputc("^", 1);
 			}
 			tputc(&c, 1);