Added license information!

1 files changed, 35 insertions, 18 deletions

diff --git a/include/negamax.c b/include/negamax.c
index 3db5867..cdcfcf9 100644
--- a/include/negamax.c
+++ b/include/negamax.c
@@ -1,7 +1,24 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "negamax.h"
 
 // ===================================================================
-// Globals
+// Variables
 // ===================================================================
 
 const float infty = 3.0;
@@ -9,52 +26,52 @@ char negamax_ptn[9];
 uint8_t negamax_search_depth = 3;
 
 // ===================================================================
-// Helpers
+// Helper declarations
 // ===================================================================
 
-static float
-negamax(const uint8_t cur_depth, float alpha, float beta,
+static float negamax(const uint8_t cur_depth, float alpha, float beta,
 				const float colour);
 
 // ===================================================================
-// α-β negamax using the cnn1986 evaluation function and transposition
-// tables using Zobrist hasing and a treap
+// Exported functions
 // ===================================================================
 
-void
-negamax_init(const uint8_t new_board_size) {
+void negamax_init(const uint8_t new_board_size) {
 	board_size = new_board_size;
 	action_list_init();
 	zobrist_init();
 	tt_init();
 }
 
-void
-negamax_free(void) {
+void negamax_free(void) {
 	zobrist_free();
 }
 
-float
-negamax_generate(void) {
+float negamax_generate(void) {
 	// We need to start with something outside of [-∞,∞] because those
 	// values are wins
 	const float safe_infty = infty + 1;
 
 	tt_init();
-	float result = negamax(negamax_search_depth,
-												 -safe_infty, safe_infty,
-												 (ply & 1) ? +1.0 : -1.0);
+	float result =
+		negamax(negamax_search_depth,
+						-safe_infty, safe_infty,
+						(ply & 1) ? +1.0 : -1.0);
 	tt_free();
 
 	return result;
 }
 
+// ===================================================================
+// α-β negamax using the cnn1986 evaluation function and transposition
+// tables using Zobrist hasing and a chaining hash table
+// ===================================================================
+
 static enum TT_FLAG flag;
 static enum WIN_TYPE w;
 
-static float
-negamax(const uint8_t cur_depth, float alpha, float beta,
-				const float colour) {
+static float negamax(const uint8_t cur_depth, float alpha, float beta,
+										 const float colour) {
 
 	uint64_t hash = zobrist_compute();
 	tt_entry_t *entry = tt_seek(hash);