From: Michael Quevillon <m.quevil@gmail.com>
Date: Thu, 13 Sep 2018 04:19:32 +0000 (-0400)
Subject: cube.c: Prohibit unsolvable single row/column game
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=55be8e50db2c103850c95db879c02cd945c36d5f;p=sgt-puzzles.git

cube.c: Prohibit unsolvable single row/column game

For cube games, the minimum for any dimension should be 2, as there is
no net of the cube that is only one row/column. The previous logic
would permit a 1x7 game (for example) that could never be solved.
---

diff --git a/cube.c b/cube.c
index 7491565..8b82719 100644
--- a/cube.c
+++ b/cube.c
@@ -543,8 +543,8 @@ static const char *validate_params(const game_params *params, int full)
 	return "Unrecognised solid type";
 
     if (solids[params->solid]->order == 4) {
-	if (params->d1 <= 0 || params->d2 <= 0)
-	    return "Both grid dimensions must be greater than zero";
+	if (params->d1 <= 1 || params->d2 <= 1)
+	    return "Both grid dimensions must be greater than one";
     } else {
 	if (params->d1 <= 0 && params->d2 <= 0)
 	    return "At least one grid dimension must be greater than zero";