diff3_internal
static int diff3_internal(int, char **, const char *, const char *);
diff3_conflicts = diff3_internal(argc, argv, cf->file_path, r2);
static int diff3_internal(int, char **, const char *, const char *);
diff3_conflicts = diff3_internal(argc, argv, av[0], av[2]);
diff3_conflicts = diff3_internal(argc, argv, workfile, r2);