commit 6530025bcaf3a65083667a93ae50035bd7137bae
from: Roberto E. Vargas Caballero <k0ga@shike2.com>
date: Fri Aug 15 12:48:16 2014 UTC

Fix portability problem in techo()

ISCONTROL chechks if a value is between 0 and 0x1f or
between 0x80 and 0x9f. Char signess depends of architecture
and compiler, so in some environment the second case is
always false (and wrong), Techo() calls ISCONTROL with a
char variable, whose type cannot be changed because tpuc()
expects a pointer to char, so the solution is to insert a
cast in the call to ISCONTROL.

commit - d4a17316d33f3c5a0017d7fe6e7e174883ccaa97
commit + 6530025bcaf3a65083667a93ae50035bd7137bae
blob - 814f3f5b404b4c3d842456e65252cfd59d44848d
blob + d8ff30b5a8746e07cc70ae00722772788ec7015a
--- st.c
+++ st.c
@@ -2311,13 +2311,13 @@ techo(char *buf, int len) {
 	for(; len > 0; buf++, len--) {
 		char c = *buf;
 
-		if(ISCONTROL(c)) { /* control code */
+		if(ISCONTROL((uchar) c)) { /* control code */
 			if(c & 0x80) {
 				c &= 0x7f;
 				tputc("^", 1);
 				tputc("[", 1);
 			} else if(c != '\n' && c != '\r' && c != '\t') {
-				c ^= '\x40';
+				c ^= 0x40;
 				tputc("^", 1);
 			}
 			tputc(&c, 1);