io/chess.c: Fix minor bug

Fail instead of ignoring spurious characters between origin and target.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/io/chess.c b/src/lib/io/chess.c
index 7c632e5..9bd7c31 100644
--- a/src/lib/io/chess.c
+++ b/src/lib/io/chess.c
@@ -85,7 +85,9 @@ int chess_read_mv(char *s, struct chess_mv *mv)
 	mv->mv.piece = chess_is_piece(*s)       ? *s++         : '?';
 	mv->mv.x0    = ('a' <= *s && *s <= 'h') ? (*s++ - 'a') : '?';
 	mv->mv.y0    = ('1' <= *s && *s <= '8') ? ('8' - *s++) : '?';
-	mv->capture  = (*s++ == 'x');
+	mv->capture  = (*s == 'x');
+	if (mv->capture)
+		s++;
 
 	return strlen(s);
 }