Bug (and fix!): Wily crashes if B2 target is very big

The subject line makes the problem clear -- I'm using a 280,000-character
selection for my "too big" B2 target.

Fix follows (this is against my hacked 0.13.36, but it looks like it should
apply fine against 0.13.41).

Index: event.c
===================================================================
RCS file: /home/trost/cvsroot/wily/wily/event.c,v
retrieving revision 1.2
diff -u -u -r1.2 event.c
--- event.c	7 Nov 1997 21:25:59 -0000	1.2
+++ event.c	29 May 2004 02:42:46 -0000
@@ -63,7 +63,7 @@
 static void	key_del(Key *k);
 static Key*	key_new(ulong key, int fd, Keytype t);
 static Key*	key_findcmd(char*cmd);
-static void	oneword(char*s, char*l);
+static void	oneword(char* s, char* l, int s_length);
 static void	output(Key*k, int n, char*s);
 static void	ex_accept(int n, char*s);
 
@@ -106,7 +106,7 @@
 	if(k->v) {
 		k->first = true;
 	} else {
-		oneword(k->cmd, cmd);
+		oneword(k->cmd, cmd, sizeof(k->cmd));
 		olabel(k->olabel, label);
 		addrunning(k->cmd);
 	}
@@ -225,12 +225,11 @@
 
 /* Put a one-word version of long command 'l' into 's' */
 static void
-oneword(char*s, char*l){
-	strcpy(s,l);
-	
-	/* break at first whitespace */
-	if( (s = strpbrk(s, whitespace)) )
-		*s='\0';
+oneword(char*s, char*l, int s_length){
+	char *blank = strpbrk(l, whitespace);
+	if (blank && blank - l < s_length)
+		s_length = blank - l;
+	strlcpy(s,l, s_length);
 }
 
 /* Copy the 'n' bytes of data in 's' to the window or output directory