get_extension (3) - Linux Manuals
get_extension: Returns a pointer to the extension of a filename. Allegro game programming library.
NAMEget_extension - Returns a pointer to the extension of a filename. Allegro game programming library.
char *get_extension(const char *filename);
DESCRIPTIONFinds out the extension of the filename (with or without path information). Example:
get_executable_name(name, sizeof(name)); allegro_message("The binary has the extension `%s'\n", get_extension(name));
RETURN VALUEReturns a pointer to the portion of `filename' where the extension starts, or a pointer to the trailing null character if there is no filename or it doesn't have extension.
SEE ALSOget_filename(3), put_backslash(3), replace_extension(3)