From 3c7b81aeb392c27a4cbead366287ff10e5c12a08 Mon Sep 17 00:00:00 2001
From: Matthew Woodcraft <matthew@woodcraft.me.uk>
Date: Sun, 8 May 2011 15:42:52 +0100
Subject: [PATCH] Implement known_command; make gtp_is_valid() stricter

---
 gtp.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gtp.c b/gtp.c
index 804c943..206e80e 100644
--- a/gtp.c
+++ b/gtp.c
@@ -79,6 +79,7 @@ static char *known_commands =
 	"name\n"
 	"version\n"
 	"list_commands\n"
+	"known_command\n"
 	"quit\n"
 	"boardsize\n"
 	"clear_board\n"
@@ -106,6 +107,7 @@ gtp_is_valid(char *cmd)
 	if (!cmd || !*cmd) return false;
 	char *s = strcasestr(known_commands, cmd);
 	if (!s) return false;
+	if (s != known_commands && s[-1] != '\n') return false;
 
 	int len = strlen(cmd);
 	return s[len] == '\0' || s[len] == '\n';
@@ -160,6 +162,16 @@ gtp_parse(struct board *board, struct engine *engine, struct time_info *ti, char
 	} else if (!strcasecmp(cmd, "list_commands")) {
 		gtp_reply(id, known_commands, NULL);
 		return P_OK;
+
+	} else if (!strcasecmp(cmd, "known_command")) {
+		char *arg;
+		next_tok(arg);
+		if (gtp_is_valid(arg)) {
+			gtp_reply(id, "true", NULL);
+		} else {
+			gtp_reply(id, "false", NULL);
+		}
+		return P_OK;
 	}
 
 	if (engine->notify && gtp_is_valid(cmd)) {
-- 
2.11.4.GIT