CoCo: Fix fuji_set_directory_position (#41)

Author: RichStephens

coco/src/fn_fuji/fuji_set_directory_position.c

@@ -6,6 +6,22 @@
 
 bool fuji_set_directory_position(uint16_t pos)
 {
-    /* TODO, implement */
-    return false;
-}
+    struct _sdp
+    {
+        uint8_t opcode;
+        uint8_t cmd;
+        uint16_t pos;
+    } sdp;
+
+    sdp.opcode = OP_FUJI;
+    sdp.cmd = FUJICMD_SET_DIRECTORY_POSITION;
+    sdp.pos = pos;
+
+    bus_ready();
+
+    dwwrite((uint8_t *)&sdp, sizeof(sdp));
+    if (fuji_get_error())
+        return false;
+    
+    return true;
+}

fujinet-fuji.h

@@ -7,6 +7,7 @@
 
 #ifdef _CMOC_VERSION_
     #include <cmoc.h>
+    #include <coco.h>
 
     #ifndef bool
     #define bool _FNBool