{
int fd = ret ? stdfderr : stdfdout;
fdprintf (fd, "usage: %s\n", progname);
+ fdprintf (fd, " -c : mode compress\n");
+ fdprintf (fd, " -d : mode decompress\n");
fdprintf (fd, " -h : help message\n");
fdprintf (fd, " -i <file>: input file\n");
fdprintf (fd, " -o <file>: output file\n");