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devmouse: produce signed msec timestamp in /dev/mouse, accept unsigned on write

--- a/sys/src/9/port/devmouse.c

+++ b/sys/src/9/port/devmouse.c

@@ -291,7 +291,7 @@

 				b = 16;

 			else if (b == 16)

 				b = 8;

-		sprint(buf, "m%11d %11d %11d %11lud ",

+		sprint(buf, "m%11d %11d %11d %11ld ",

 			m.xy.x, m.xy.y, b, m.msec);

 		mouse.lastcounter = m.counter;

@@ -448,7 +448,7 @@

 		if(*p == 0)

 			error(Eshort);

 		b = strtol(p, &p, 0);

-		msec = strtol(p, 0, 0);

+		msec = (ulong)strtoll(p, 0, 0);

 		if(msec == 0)

 			msec = TK2MS(MACHP(0)->ticks);

--- a/sys/src/cmd/vnc/devmouse.c

+++ b/sys/src/cmd/vnc/devmouse.c

@@ -191,7 +191,7 @@

 			m = mouse.Mousestate;

 		unlock(&mouse);

-		sprint(buf, "m%11d %11d %11d %11lud ",

+		sprint(buf, "m%11d %11d %11d %11ld ",

 			m.xy.x, m.xy.y, m.buttons, m.msec);

 		mouse.lastcounter = m.counter;