From 77de899d5b1abfabe40371f2f6fa4517ace0e28c Mon Sep 17 00:00:00 2001
From: tslil <tslil@posteo.de>
Date: Wed, 30 Dec 2020 18:39:20 -0500
Subject: Corrected PTN move parsing

---
 include/tak.c | 21 ++++++---------------
 include/tak.h |  6 ++++++
 2 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/include/tak.c b/include/tak.c
index 1970fca..6bb11ec 100644
--- a/include/tak.c
+++ b/include/tak.c
@@ -3,18 +3,11 @@
 // -------------------------------------------------------------------
 // Helpers
 
-#define NUM_SHIFT  4
 #define NUM_INC    (0x1<<NUM_SHIFT) // 0b00010000
 #define NUM_MASK   (0xF<<NUM_SHIFT) // 0b11110000
-#define STONE_MASK 0b00000011
 #define DFS_MASK   0b00001100
 #define USED_MASK  0b11110011
 
-#define STONE_AT(l) (celldat[(l)] & STONE_MASK)
-#define COUNT_AT(l) (celldat[(l)] >> NUM_SHIFT)
-
-#define THE_COORDS(x,y) ((x)+(y)*board_size)
-
 // -------------------------------------------------------------------
 // General state stuff
 
@@ -389,15 +382,13 @@ parse_move(const uint8_t board_size, char *ptn,
   }
 
   ptn++;
-  // Handle the case '[1]<column><row><direction>' as
-  // '1<column><row><direction>1' for convenience
+  // Handle the case 'n<column><row><direction>' as
+  // 'n<column><row><direction>n' for convenience, if n is omitted
+  // assume n = 1
   if (*ptn == 0) {
-    if (picked_up == 1) {
-      *out_steps = 1;
-      out_drops[0] = 1;
-    } else {
-      return PTN_INVALID;
-    }
+    *out_steps = picked_up;
+    out_drops[0] = picked_up;
+    return PTN_VALID;
   }
 
   *out_steps = 0;
diff --git a/include/tak.h b/include/tak.h
index c703943..d161640 100644
--- a/include/tak.h
+++ b/include/tak.h
@@ -16,6 +16,12 @@ enum MOVE_DIRECTION { M_UP, M_DOWN, M_LEFT, M_RIGHT };
 typedef uint8_t data_t;
 typedef uint16_t colour_stack_t;
 
+#define NUM_SHIFT  4
+#define STONE_MASK 0b00000011
+#define STONE_AT(l) (celldat[(l)] & STONE_MASK)
+#define COUNT_AT(l) (celldat[(l)] >> NUM_SHIFT)
+#define THE_COORDS(x,y) ((x)+(y)*board_size)
+
 uint8_t board_size;
 data_t celldat[36];
 colour_stack_t colours[36];
-- 
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