dir seeking

libsrc/rp6502/f_closedir.c

@@ -1,5 +1,4 @@
 #include <rp6502.h>
-#include <fcntl.h>
 
 int __fastcall__ f_closedir (int dirdes)
 {

libsrc/rp6502/f_lseek.c

@@ -1,5 +1,4 @@
 #include <rp6502.h>
-#include <unistd.h>
 
 long __fastcall__ f_lseek (long offset, int whence, int fildes)
 {

libsrc/rp6502/f_readdir.c

@@ -1,8 +1,6 @@
 #include <rp6502.h>
-#include <errno.h>
-#include <string.h>
 
-int __fastcall__ f_readdir (f_stat_t *dirent, int dirdes)
+int __fastcall__ f_readdir (f_stat_t* dirent, int dirdes)
 {
     int i, ax;
     ria_set_ax (dirdes);

libsrc/rp6502/f_rewinddir.c

@@ -0,0 +1,7 @@
+#include <rp6502.h>
+
+int __fastcall__ f_rewinddir (int dirdes)
+{
+    ria_set_ax (dirdes);
+    return ria_call_int (RIA_OP_REWINDDIR);
+}

libsrc/rp6502/f_seekdir.c

@@ -0,0 +1,8 @@
+#include <rp6502.h>
+
+int __fastcall__ f_seekdir (long offs, int dirdes)
+{
+    ria_set_ax (dirdes);
+    ria_push_long (offs);
+    return ria_call_int (RIA_OP_SEEKDIR);
+}

libsrc/rp6502/f_telldir.c

@@ -0,0 +1,7 @@
+#include <rp6502.h>
+
+long __fastcall__ f_telldir (int dirdes)
+{
+    ria_set_ax (dirdes);
+    return ria_call_long (RIA_OP_TELLDIR);
+}