Fix rare bug, but one more bug to go

1 files changed, 12 insertions, 0 deletions

diff --git a/src/core/moves.h b/src/core/moves.h
index 037944b..3a1158b 100644
--- a/src/core/moves.h
+++ b/src/core/moves.h
@@ -12,6 +12,7 @@ STATIC cube_t move(cube_t, uint8_t);
 STATIC cube_t premove(cube_t, uint8_t);
 STATIC uint8_t inverse_move(uint8_t);
 STATIC void invertmoves(uint8_t *, uint8_t, uint8_t *);
+STATIC void sortparallel(uint8_t *, uint8_t);
 
 STATIC int readmoves(const char *, int, uint8_t *);
 STATIC cube_t applymoves(cube_t, const char *);
@@ -229,6 +230,17 @@ invertmoves(uint8_t *moves, uint8_t nmoves, uint8_t *ret)
 }
 #pragma GCC pop_options
 
+STATIC void
+sortparallel(uint8_t *moves, uint8_t n)
+{
+        uint8_t i;
+
+        for (i = 0; i < n-1; i++)
+                if (moveaxis(moves[i]) == moveaxis(moves[i+1]) &&
+                    movebase(moves[i]) == movebase(moves[i+1]) + 1)
+                        SWAP(moves[i], moves[i+1]);
+}
+
 STATIC int
 readmoves(const char *buf, int max, uint8_t *ret)
 {