/*

  * This file is part of FFmpeg.

  *

  * FFmpeg 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.
  *

  * FFmpeg 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 FFmpeg; 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;
 }