--- old-freeciv/server/stdinhand.c	Sun Mar 21 13:32:38 1999
+++ freeciv/server/stdinhand.c	Tue Apr  6 21:57:33 1999
@@ -990,7 +990,8 @@
   
   for(cptr_s=str; *cptr_s && !isalnum(*cptr_s); cptr_s++);
 
-  for(cptr_d=command; *cptr_s && isalnum(*cptr_s); cptr_s++, cptr_d++)
+  for(cptr_d=command; *cptr_s && isalnum(*cptr_s) &&
+      cptr_d < command+sizeof(command)-1; cptr_s++, cptr_d++)
     *cptr_d=*cptr_s;
   *cptr_d='\0';