string - Getting file extension in C

Question

How do you get a file extension (like .tiff) from a filename in C?

Thanks!

Answer 1

const char *get_filename_ext(const char *filename) {
    const char *dot = strrchr(filename, '.');
    if(!dot || dot == filename) return "";
    return dot + 1;
}

printf("%s
", get_filename_ext("test.tiff"));
printf("%s
", get_filename_ext("test.blah.tiff"));
printf("%s
", get_filename_ext("test."));
printf("%s
", get_filename_ext("test"));
printf("%s
", get_filename_ext("..."));