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Add --help

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Provide command-line help, with -h/--help option.
This commit is contained in:
Romain Vimont 2018-02-01 11:44:09 +01:00
parent ee93f3f23a
commit 35a111d56e
1 changed files with 48 additions and 1 deletions
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49
app/src/main.c
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@ -10,19 +10,59 @@
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()) {