text: /*
   * This file is part of Libav.
   *
   * Libav is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * Libav is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with Libav; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /*
   * This file was copied from the following newsgroup posting:
   *
   * Newsgroups: mod.std.unix
   * Subject: public domain AT&T getopt source
   * Date: 3 Nov 85 19:34:15 GMT
   *
   * Here's something you've all been waiting for:  the AT&T public domain
   * source for getopt(3).  It is the code which was given out at the 1985
   * UNIFORUM conference in Dallas.  I obtained it by electronic mail
   * directly from AT&T.  The people there assure me that it is indeed
   * in the public domain.
   */
  
  #include <stdio.h>
  #include <string.h>
  
  static int opterr = 1;
  static int optind = 1;
  static int optopt;
  static char *optarg;
  
  static int getopt(int argc, char *argv[], char *opts)
  {
      static int sp = 1;
      int c;
      char *cp;
  
      if (sp == 1)
          if (optind >= argc ||
              argv[optind][0] != '-' || argv[optind][1] == '\0')
              return EOF;
          else if (!strcmp(argv[optind], "--")) {
              optind++;
              return EOF;
          }
      optopt = c = argv[optind][sp];
      if (c == ':' || !(cp = strchr(opts, c))) {
          fprintf(stderr, ": illegal option -- %c\n", c);
          if (argv[optind][++sp] == '\0') {
              optind++;
              sp = 1;
          }
          return '?';
      }
      if (*++cp == ':') {
          if (argv[optind][sp+1] != '\0')
              optarg = &argv[optind++][sp+1];
          else if(++optind >= argc) {
              fprintf(stderr, ": option requires an argument -- %c\n", c);
              sp = 1;
              return '?';
          } else
              optarg = argv[optind++];
          sp = 1;
      } else {
          if (argv[optind][++sp] == '\0') {
              sp = 1;
              optind++;
          }
          optarg = NULL;
      }
  
      return c;
  }
  