From 522f5dae6842a241149e4e466ff830a29d1cf73d Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Mon, 20 May 2013 16:51:12 -0400
Subject: Limit paddle movement to game board.

---
diff --git a/src/game.c b/src/game.c
index e75a04b..7628c67 100644
--- a/src/game.c
+++ b/src/game.c
@@ -56,6 +56,8 @@ static void
 input(struct game *g)
 {
 	int c;
+	struct paddle *pad;
+	int dir;
 
 	timeout(0);
 	for (;;) {
@@ -65,17 +67,29 @@ input(struct game *g)
 		} else if (c == ERR) {
 			break;
 		} else if (c == KEY_LEFT) {
-			g->players[0]->paddle_h.pos -=
-				g->players[0]->paddle_h.speed;
+			pad = &g->players[0]->paddle_h;
+			dir = -1;
+			if (pad->pos > pad->size / 2 + 2) {
+				pad->pos += pad->speed * dir;
+			}
 		} else if (c == KEY_RIGHT) {
-			g->players[0]->paddle_h.pos +=
-				g->players[0]->paddle_h.speed;
+			pad = &g->players[0]->paddle_h;
+			dir = 1;
+			if (pad->pos < 78 - pad->size / 2) {
+				pad->pos += pad->speed * dir;
+			}
 		} else if (c == KEY_UP) {
-			g->players[0]->paddle_v.pos -=
-				g->players[0]->paddle_v.speed;
+			pad = &g->players[0]->paddle_v;
+			dir = -1;
+			if (pad->pos > pad->size / 2 + 2) {
+				pad->pos += pad->speed * dir;
+			}
 		} else if (c == KEY_DOWN) {
-			g->players[0]->paddle_v.pos +=
-				g->players[0]->paddle_v.speed;
+			pad = &g->players[0]->paddle_v;
+			dir = 1;
+			if (pad->pos < 23 - pad->size / 2) {
+				pad->pos += pad->speed * dir;
+			}
 		}
 	}
 }
--
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