FILE *fn_open (const char *fn, const char *mode);
int fn_close (const char *fn, FILE *file);
-struct file_identity *fn_get_identity (const char *filename);
+struct file_identity *fn_get_identity (const char *file_name);
void fn_free_identity (struct file_identity *);
int fn_compare_file_identities (const struct file_identity *,
const struct file_identity *);