py: Factor out persistent-code reader into separate files.
Implementations of persistent-code reader are provided for POSIX systems
and systems using FatFS. Macros to use these are MICROPY_READER_POSIX and
MICROPY_READER_FATFS respectively. If an alternative implementation is
needed then a port can define the function mp_reader_new_file.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 3945a1a..1980e64 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -381,6 +381,16 @@
/*****************************************************************************/
/* Python internal features */
+// Whether to use the POSIX reader for importing files
+#ifndef MICROPY_READER_POSIX
+#define MICROPY_READER_POSIX (0)
+#endif
+
+// Whether to use the FatFS reader for importing files
+#ifndef MICROPY_READER_FATFS
+#define MICROPY_READER_FATFS (0)
+#endif
+
// Hook for the VM at the start of the opcode loop (can contain variable
// definitions usable by the other hook functions)
#ifndef MICROPY_VM_HOOK_INIT