Index: eval.c
===================================================================
RCS file: /cvsroot/xmlgawk/xmlgawk/eval.c,v
retrieving revision 1.10
diff -b -u -p -r1.10 eval.c
--- eval.c	16 Apr 2005 16:31:24 -0000	1.10
+++ eval.c	21 Apr 2005 18:03:32 -0000
@@ -1137,7 +1137,7 @@ r_tree_eval(register NODE *tree, int isc
 
 			erealloc(l->stptr, char *, nlen, "interpret");
 			memcpy(l->stptr + l->stlen, r->stptr, r->stlen);
-			l->stlen += r->stlen;
+			l->stptr[l->stlen += r->stlen] = '\0';
 		} else {
 			char *nval;
 			size_t nlen = l->stlen + r->stlen + 2;