From ce19f8793a56c595a07008e54c5ef3fc45a74f93 Mon Sep 17 00:00:00 2001
From: Quinten Kock <quintenkock@gmail.com>
Date: Fri, 19 Jun 2020 18:28:09 +0200
Subject: [PATCH] Store UCI strings in progmem

---
 Uci.h | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/Uci.h b/Uci.h
index 4acc8e3..6a8ad2f 100644
--- a/Uci.h
+++ b/Uci.h
@@ -1,6 +1,8 @@
 #ifndef __UCI_H_INC
 #define __UCI_H_INC
 
+#define PS2(s) ([]{ static const char c[] PROGMEM = (s); return &c[0]; }())
+
 typedef void uci_return;
 typedef uci_return (*uci_handler)();
 
@@ -22,19 +24,19 @@ uci_return uci_unknown() {
 }
 
 const uci_cmd UCI_COMMANDS[] = {
-	{"uci", &uci_hello},
-	{"debug", &uci_unimpl},
-	{"isready", &uci_unimpl},
-	{"setoption", &uci_unimpl},
-	{"ucinewgame", &uci_unimpl},
-	{"position", &uci_unimpl},
-	{"go", &uci_unimpl},
-	{"stop", &uci_unimpl},
-	{"ponderhit", &uci_unimpl},
-	{"quit", &uci_unimpl},
+	{PS2("uci"), &uci_hello},
+	{PS2("debug"), &uci_unimpl},
+	{PS2("isready"), &uci_unimpl},
+	{PS2("setoption"), &uci_unimpl},
+	{PS2("ucinewgame"), &uci_unimpl},
+	{PS2("position"), &uci_unimpl},
+	{PS2("go"), &uci_unimpl},
+	{PS2("stop"), &uci_unimpl},
+	{PS2("ponderhit"), &uci_unimpl},
+	{PS2("quit"), &uci_unimpl},
 };
 
-const uci_cmd UCI_INVALID = {"", &uci_unknown};
+const uci_cmd UCI_INVALID = {PS2(""), &uci_unknown};
 
 uci_cmd get_uci_command(const char* command) {
 	size_t command_num = sizeof(UCI_COMMANDS) / sizeof(uci_cmd);
@@ -42,7 +44,7 @@ uci_cmd get_uci_command(const char* command) {
 		size_t ci = 0;
 		uci_cmd to_try = UCI_COMMANDS[i];
 		while(true) {
-			char reference = to_try.command[ci];
+			char reference = pgm_read_byte_near(to_try.command + ci);
 			if(reference != command[ci]) {
 				break;
 			}