$NetBSD: patch-aa,v 1.8 2018/11/30 17:30:24 nia Exp $

- Use ctype.h functions properly.
- Don't assume :0 if DISPLAY isn't set.

--- src/main.c.orig	2007-08-01 14:08:29.000000000 +0000
+++ src/main.c
@@ -196,7 +196,7 @@ xerror_handler (Display * dpy, XErrorEve
 void
 color_aliases(int idx)
 {
-    if (rs_color[idx] && isdigit(*rs_color[idx])) {
+    if (rs_color[idx] && isdigit((unsigned char)*rs_color[idx])) {
 	int             i = atoi(rs_color[idx]);
 
 	if (i >= 8 && i <= 15) {	/* bright colors */
@@ -1218,7 +1218,7 @@ set_window_color(int idx, const char *co
 	return;
 
 /* handle color aliases */
-    if (isdigit(*color)) {
+    if (isdigit((unsigned char)*color)) {
 	i = atoi(color);
 	if (i >= 8 && i <= 15) {	/* bright colors */
 	    i -= 8;
@@ -1435,7 +1435,7 @@ change_font(int init, const char *fontna
 		break;
 
 	    default:
-		if (fontname[1] != '\0' && !isdigit(fontname[1]))
+		if (fontname[1] != '\0' && !isdigit((unsigned char)fontname[1]))
 		    return;
 		if (idx < 0 || idx >= (NFONTS))
 		    return;
@@ -2057,9 +2057,14 @@ main(int argc, char *argv[])
  */
     get_options(argc, argv);
 
-	if( display_name == NULL )
-    	if ((display_name = getenv("DISPLAY")) == NULL)
-			display_name = ":0";
+    if( display_name == NULL )
+	display_name = getenv("DISPLAY");
+
+    if( display_name == NULL )
+    {
+	print_error("DISPLAY variable not set and none given");
+	exit(EXIT_FAILURE);
+    }
 
 #ifdef HAVE_AFTERSTEP
 #ifdef MyArgs_IS_MACRO