chdir and friends

libsrc/rp6502/f_utime.c

@@ -0,0 +1,21 @@
+#include <rp6502.h>
+#include <errno.h>
+#include <string.h>
+
+int __fastcall__ f_utime (const char* path, unsigned fdate, unsigned ftime, unsigned crdate, unsigned crtime)
+{
+    size_t pathlen;
+    ria_set_ax (crtime);
+    pathlen = strlen (path);
+    if (pathlen > 255) {
+        errno = EINVAL;
+        return -1;
+    }
+    while (pathlen) {
+        ria_push_char (path[--pathlen]);
+    }
+    ria_push_int (fdate);
+    ria_push_int (ftime);
+    ria_push_int (crdate);
+    return ria_call_int (RIA_OP_UTIME);
+}