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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. /*
  20.  * This file was copied from the following newsgroup posting:
  21.  *
  22.  * Newsgroups: mod.std.unix
  23.  * Subject: public domain AT&T getopt source
  24.  * Date: 3 Nov 85 19:34:15 GMT
  25.  *
  26.  * Here's something you've all been waiting for:  the AT&T public domain
  27.  * source for getopt(3).  It is the code which was given out at the 1985
  28.  * UNIFORUM conference in Dallas.  I obtained it by electronic mail
  29.  * directly from AT&T.  The people there assure me that it is indeed
  30.  * in the public domain.
  31.  */
  32.  
  33. #include <stdio.h>
  34. #include <string.h>
  35.  
  36. static int opterr = 1;
  37. static int optind = 1;
  38. static int optopt;
  39. static char *optarg;
  40.  
  41. static int getopt(int argc, char *argv[], char *opts)
  42. {
  43.     static int sp = 1;
  44.     int c;
  45.     char *cp;
  46.  
  47.     if (sp == 1) {
  48.         if (optind >= argc ||
  49.             argv[optind][0] != '-' || argv[optind][1] == '\0')
  50.             return EOF;
  51.         else if (!strcmp(argv[optind], "--")) {
  52.             optind++;
  53.             return EOF;
  54.         }
  55.     }
  56.     optopt = c = argv[optind][sp];
  57.     if (c == ':' || !(cp = strchr(opts, c))) {
  58.         fprintf(stderr, ": illegal option -- %c\n", c);
  59.         if (argv[optind][++sp] == '\0') {
  60.             optind++;
  61.             sp = 1;
  62.         }
  63.         return '?';
  64.     }
  65.     if (*++cp == ':') {
  66.         if (argv[optind][sp+1] != '\0')
  67.             optarg = &argv[optind++][sp+1];
  68.         else if(++optind >= argc) {
  69.             fprintf(stderr, ": option requires an argument -- %c\n", c);
  70.             sp = 1;
  71.             return '?';
  72.         } else
  73.             optarg = argv[optind++];
  74.         sp = 1;
  75.     } else {
  76.         if (argv[optind][++sp] == '\0') {
  77.             sp = 1;
  78.             optind++;
  79.         }
  80.         optarg = NULL;
  81.     }
  82.  
  83.     return c;
  84. }
  85.