Add ryfs_tell, bump version to 0.4.0

fox32rom.def

@@ -68,6 +68,7 @@ ryfs_read:                                jmp [0xF0045010]
 ryfs_read_whole_file:                     jmp [0xF0045014]
 ryfs_get_size:                            jmp [0xF0045018]
 ryfs_get_file_list:                       jmp [0xF004501C]
+ryfs_tell:                                jmp [0xF0045020]
 
 ; memory copy/compare jump table
 copy_memory_bytes:                        jmp [0xF0046000]

main.asm

@@ -3,8 +3,8 @@
     org 0xF0000000
 
 const FOX32ROM_VERSION_MAJOR: 0
-const FOX32ROM_VERSION_MINOR: 3
-const FOX32ROM_VERSION_PATCH: 3
+const FOX32ROM_VERSION_MINOR: 4
+const FOX32ROM_VERSION_PATCH: 0
 
 const SYSTEM_STACK:     0x01FFF800
 const BACKGROUND_COLOR: 0xFF674764
@@ -242,6 +242,7 @@ get_rom_version:
     data.32 ryfs_read_whole_file
     data.32 ryfs_get_size
     data.32 ryfs_get_file_list
+    data.32 ryfs_tell
 
     ; memory copy/compare jump table
     org.pad 0xF0046000

ryfs.asm

@@ -73,6 +73,17 @@ ryfs_seek:
     pop r1
     ret
 
+; get the seek offset of the specified file
+; inputs:
+; r0: pointer to file struct
+; outputs:
+; r0: byte offset
+ryfs_tell:
+    add r0, 3
+    mov r0, [r0]
+
+    ret
+
 ; read specified number of bytes into the specified buffer
 ; inputs:
 ; r0: number of bytes to read