===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/timeout/timeout.c,v
retrieving revision 1.20
retrieving revision 1.21
diff -u -r1.20 -r1.21
--- src/usr.bin/timeout/timeout.c	2022/01/12 22:51:44	1.20
+++ src/usr.bin/timeout/timeout.c	2022/07/02 19:00:35	1.21
@@ -1,4 +1,4 @@
-/* $OpenBSD: timeout.c,v 1.20 2022/01/12 22:51:44 tb Exp $ */
+/* $OpenBSD: timeout.c,v 1.21 2022/07/02 19:00:35 kn Exp $ */
 
 /*
  * Copyright (c) 2021 Job Snijders <job@openbsd.org>
@@ -32,6 +32,7 @@
 #include <sys/time.h>
 #include <sys/wait.h>
 
+#include <ctype.h>
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
@@ -104,10 +105,11 @@
 	long long	 sig;
 	const char	*errstr;
 
-	if (strncasecmp(str, "SIG", 3) == 0) {
+	if (isalpha((unsigned char)*str)) {
 		int i;
 
-		str += 3;
+		if (strncasecmp(str, "SIG", 3) == 0)
+			str += 3;
 		for (i = 1; i < NSIG; i++) {
 			if (strcasecmp(str, sys_signame[i]) == 0)
 				return (i);