test/core/test_getopt.c

/*
 * Copyright 2016 The Emscripten Authors.  All rights reserved.
 * Emscripten is available under two separate licenses, the MIT license and the
 * University of Illinois/NCSA Open Source License.  Both these licenses can be
 * found in the LICENSE file.
 */

#pragma clang diagnostic ignored "-Winvalid-pp-token"
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
  int flags, opt;
  int nsecs, tfnd;

  nsecs = 0;
  tfnd = 0;
  flags = 0;
  while ((opt = getopt(argc, argv, "nt:")) != -1) {
    switch (opt) {
      case 'n':
        flags = 1;
        break;
      case 't':
        nsecs = atoi(optarg);
        tfnd = 1;
        break;
      default: /* '?' */
        fprintf(stderr, "Usage: %s [-t nsecs] [-n] name\n", argv[0]);
        exit(EXIT_FAILURE);
    }
  }

  printf("flags=%d; tfnd=%d; optind=%d\n", flags, tfnd, optind);

  if (optind >= argc) {
    fprintf(stderr, "Expected argument after options\n");
    exit(EXIT_FAILURE);
  }

  printf("name argument = %s\n", argv[optind]);

  /* Other code omitted */

  exit(EXIT_SUCCESS);
}