Go-style flag parsing for C programs.
Install with clib:
$ clib install flag
Much like the Go flag package you have the choice of using a lower level flagset_t, or relying on the less flexible singleton. The following example uses the singleton, which handles the --version and --help output for you, as well as reporting errors.
#include <stdio.h>
#include "flag.h"
#define VERSION "v1.0.0"
int
main(int argc, const char **argv) {
int requests = 5000;
int concurrency = 10;
const char *url = ":3000";
flag_int(&requests, "requests", "Number of total requests");
flag_int(&concurrency, "concurrency", "Number of concurrent requests");
flag_str(&url, "url", "Target url");
flag_parse(argc, argv, VERSION);
puts("");
printf(" requests: %d\n", requests);
printf(" concurrency: %d\n", concurrency);
printf(" url: %s\n", url);
puts("");
return 0;
}Default help output:
Usage: ./example [options] [arguments]
Options:
--requests Number of total requests (5000)
--concurrency Number of concurrent requests (10)
--url Target url (:3000)
--version Output version
--help Output help
MIT