diff --git a/ncurses/trace/lib_tracemse.c b/ncurses/trace/lib_tracemse.c
index 74cc177..c62b71a 100644
--- a/ncurses/trace/lib_tracemse.c
+++ b/ncurses/trace/lib_tracemse.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2012,2014 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -38,23 +38,22 @@
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: lib_tracemse.c,v 1.15 2008/08/03 15:39:29 tom Exp $")
+MODULE_ID("$Id: lib_tracemse.c,v 1.22 2014/10/10 09:06:26 tom Exp $")
 
 #ifdef TRACE
 
 #define my_buffer sp->tracemse_buf
 
 NCURSES_EXPORT(char *)
-_nc_tracemouse(SCREEN *sp, MEVENT const *ep)
+_nc_trace_mmask_t(SCREEN *sp, mmask_t code)
 {
-    (void) sprintf(my_buffer, TRACEMSE_FMT,
-		   ep->id,
-		   ep->x,
-		   ep->y,
-		   ep->z,
-		   (unsigned long) ep->bstate);
-
-#define SHOW(m, s) if ((ep->bstate & m) == m) strcat(strcat(my_buffer, s), ", ")
+#define SHOW(m, s) \
+    if ((code & m) == m) { \
+	size_t n = strlen(my_buffer); \
+	if (n && (my_buffer[n-1] != '{')) \
+	_nc_STRCAT(my_buffer, ", ", sizeof(my_buffer)); \
+	_nc_STRCAT(my_buffer, s, sizeof(my_buffer)); \
+    }
 
     SHOW(BUTTON1_RELEASED, "release-1");
     SHOW(BUTTON1_PRESSED, "press-1");
@@ -110,14 +109,47 @@
 
     if (my_buffer[strlen(my_buffer) - 1] == ' ')
 	my_buffer[strlen(my_buffer) - 2] = '\0';
-    (void) strcat(my_buffer, "}");
+
     return (my_buffer);
 }
 
 NCURSES_EXPORT(char *)
+_nc_tracemouse(SCREEN *sp, MEVENT const *ep)
+{
+    char *result = 0;
+
+    if (sp != 0) {
+	_nc_SPRINTF(my_buffer, _nc_SLIMIT(sizeof(my_buffer))
+		    TRACEMSE_FMT,
+		    ep->id,
+		    ep->x,
+		    ep->y,
+		    ep->z,
+		    (unsigned long) ep->bstate);
+
+	(void) _nc_trace_mmask_t(sp, ep->bstate);
+	_nc_STRCAT(my_buffer, "}", sizeof(my_buffer));
+	result = (my_buffer);
+    }
+    return result;
+}
+
+NCURSES_EXPORT(mmask_t)
+_nc_retrace_mmask_t(SCREEN *sp, mmask_t code)
+{
+    if (sp != 0) {
+	*my_buffer = '\0';
+	T((T_RETURN("{%s}"), _nc_trace_mmask_t(sp, code)));
+    } else {
+	T((T_RETURN("{?}")));
+    }
+    return code;
+}
+
+NCURSES_EXPORT(char *)
 _tracemouse(MEVENT const *ep)
 {
-    return _nc_tracemouse(SP, ep);
+    return _nc_tracemouse(CURRENT_SCREEN, ep);
 }
 
 #else /* !TRACE */