diff --git a/misc.c b/misc.c
index 495b029..feeacb8 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: misc.c,v 1.4 2001/02/28 17:52:54 deraadt Exp $	*/
+/*	$OpenBSD: misc.c,v 1.5 2001/04/12 20:09:37 stevesk Exp $	*/
 
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
@@ -25,7 +25,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: misc.c,v 1.4 2001/02/28 17:52:54 deraadt Exp $");
+RCSID("$OpenBSD: misc.c,v 1.5 2001/04/12 20:09:37 stevesk Exp $");
 
 #include "misc.h"
 #include "log.h"
@@ -116,6 +116,21 @@
 	return copy;
 }
 
+int a2port(const char *s)
+{
+	long port;
+	char *endp;
+
+	errno = 0;
+	port = strtol(s, &endp, 0);
+	if (s == endp || *endp != '\0' ||
+	    (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
+	    port <= 0 || port > 65535)
+		return 0;
+
+	return port;
+}
+
 mysig_t
 mysignal(int sig, mysig_t act)
 {