Include filename for 'No such file/directory', etc.

Author: dhalbert

extmod/vfs_fat_file.c

@@ -199,7 +199,7 @@ STATIC mp_obj_t file_open(fs_user_mount_t *vfs, const mp_obj_type_t *type, mp_ar
     FRESULT res = f_open(&vfs->fatfs, &o->fp, fname, mode);
     if (res != FR_OK) {
         m_del_obj(pyb_file_obj_t, o);
-        mp_raise_OSError(fresult_to_errno_table[res]);
+        mp_raise_OSError_errno_str(fresult_to_errno_table[res], fname);
     }
     // If we're reading, turn on fast seek.
     if (mode == FA_READ) {

py/runtime.c

@@ -29,10 +29,12 @@
 #include <string.h>
 #include <assert.h>
 
+
 #include "extmod/vfs.h"
 
 #include "py/parsenum.h"
 #include "py/compile.h"
+#include "py/mperrno.h"
 #include "py/objstr.h"
 #include "py/objtuple.h"
 #include "py/objtype.h"
@@ -1576,6 +1578,13 @@ NORETURN void mp_raise_OSError_msg(const compressed_string_t *msg) {
     mp_raise_msg(&mp_type_OSError, msg);
 }
 
+NORETURN void mp_raise_OSError_errno_str(int errno_, const char *str) {
+    char decompressed[50];
+    const char *errno_str = mp_common_errno_to_str(MP_OBJ_NEW_SMALL_INT(errno_),
+                                                   decompressed, sizeof(decompressed));
+    mp_raise_OSError_msg_varg(translate("[Errno %d] %s: %s"), errno_, errno_str, str);
+}
+
 NORETURN void mp_raise_OSError_msg_varg(const compressed_string_t *fmt, ...) {
     va_list argptr;
     va_start(argptr,fmt);

py/runtime.h

@@ -161,6 +161,7 @@ NORETURN void mp_raise_RuntimeError(const compressed_string_t *msg);
 NORETURN void mp_raise_ImportError(const compressed_string_t *msg);
 NORETURN void mp_raise_IndexError(const compressed_string_t *msg);
 NORETURN void mp_raise_OSError(int errno_);
+NORETURN void mp_raise_OSError_errno_str(int errno_, const char *str);
 NORETURN void mp_raise_OSError_msg(const compressed_string_t *msg);
 NORETURN void mp_raise_OSError_msg_varg(const compressed_string_t *fmt, ...);
 NORETURN void mp_raise_NotImplementedError(const compressed_string_t *msg);