fs/fat: implement fsuuid command

The FAT file system does not have a UUID but a 4 byte volume ID.
Let the fsuuid command show it in XXXX-XXXX format.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/fat.h b/include/fat.h
index 8cae283..b9f273f 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -212,4 +212,16 @@ int fat_unlink(const char *filename);
 int fat_mkdir(const char *dirname);
 void fat_close(void);
 void *fat_next_cluster(fat_itr *itr, unsigned int *nbytes);
+
+/**
+ * fat_uuid() - get FAT volume ID
+ *
+ * The FAT volume ID returned in @uuid_str as hexadecimal number in XXXX-XXXX
+ * format.
+ *
+ * @uuid_str:	caller allocated buffer of at least 10 bytes for the volume ID
+ * Return:	0 on success
+ */
+int fat_uuid(char *uuid_str);
+
 #endif /* _FAT_H_ */