Add --help
Provide command-line help, with -h/--help option.
struct args {
const char *serial;
+ SDL_bool help;
Uint16 port;
Uint16 max_size;
};
+static void usage(const char *arg0) {
+ fprintf(stderr,
+ "Usage: %s [options] [serial]\n"
+ "\n"
+ " serial\n"
+ " The device serial number. Mandatory only if several devices\n"
+ " are connected to adb.\n"
+ "\n"
+ "Options:\n"
+ "\n"
+ " -h, --help\n"
+ " Print this help.\n"
+ "\n"
+ " -m, --max-size value\n"
+ " Limit both the width and height of the video to value. The\n"
+ " other dimension is computed so that the device aspect-ratio\n"
+ " is preserved.\n"
+ " Default is %d%s.\n"
+ "\n"
+ " -p, --port port\n"
+ " Set the TCP port the client listens on.\n"
+ " Default is %d.\n"
+ "\n"
+ "Shortcuts:\n"
+ "\n"
+ " Ctrl+f: switch fullscreen mode\n"
+ " Ctrl+g: resize window to 1:1 (pixel-perfect)\n"
+ " Ctrl+x: resize window to optimal size (remove black borders)\n"
+ "\n",
+ arg0,
+ DEFAULT_MAX_SIZE, DEFAULT_MAX_SIZE ? "" : " (unlimited)",
+ DEFAULT_LOCAL_PORT);
+}
+
static int parse_args(struct args *args, int argc, char *argv[]) {
static const struct option long_options[] = {
+ {"help", no_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"max-size", required_argument, NULL, 'm'},
{NULL, 0, NULL, 0 },
};
int c;
- while ((c = getopt_long(argc, argv, "p:m:", long_options, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "hp:m:", long_options, NULL)) != -1) {
switch (c) {
+ case 'h': {
+ args->help = SDL_TRUE;
+ break;
+ }
case 'p': {
char *endptr;
long value = strtol(optarg, &endptr, 0);
@@ -72,14 +112,21 @@ int main(int argc, char *argv[]) {
int res;
struct args args = {
+ .help = SDL_FALSE,
.serial = NULL,
.max_size = DEFAULT_MAX_SIZE,
.port = DEFAULT_LOCAL_PORT,
};
if (parse_args(&args, argc, argv)) {
+ usage(argv[0]);
return 1;
}
+ if (args.help) {
+ usage(argv[0]);
+ return 0;
+ }
+
av_register_all();
if (avformat_network_init()) {
