git.zerfleddert.de Git - proxmark3-svn/blob - client/reveng/getopt.c

   1 /*----------------------------------------------------------------------
   2
   3     Replacement for Unix "getopt()", for DOS/Windows/etc.
   4
   5     getopt.c 1.3 2003/09/17 16:17:59
   6
   7     Copyright (C) 1998, 2003 by David A. Hinds -- All Rights Reserved
   8
   9     This file is part of ASPEX.
  10
  11     ASPEX is free software; you can redistribute it and/or modify it
  12     under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     ASPEX is distributed in the hope that it will be useful, but
  17     WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19     General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with ASPEX; if not, write to the Free Software Foundation,
  23     Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24
  25 ----------------------------------------------------------------------*/
  26
  27 #include "string.h"
  28 #include "stdio.h"
  29 #include "getopt.h"
  30
  31 char *optarg;
  32 int optind = 1, opterr, optopt;
  33 int pos = 0;
  34 int getopt(int argc, char *argv[], const char *optstring)
  35 {
  36     //static int pos = 0;
  37     char *str;
  38
  39     if (pos == 0) {
  40         if ((optind >= argc) || (*argv[optind] != '-'))
  41             return EOF;
  42         pos = 1;
  43         if (argv[optind][pos] == '\0')
  44             return EOF;
  45     }
  46
  47     str = strchr(optstring, argv[optind][pos]);
  48     if (str == NULL) {
  49         optopt = argv[optind][pos];
  50         if (opterr)
  51             fprintf(stderr, "%s: illegal option -- %c\n", argv[0],
  52                     optopt);
  53         return '?';
  54     }
  55
  56     if (str[1] == ':') {
  57         if (argv[optind][pos+1] != '\0') {
  58             optarg = &argv[optind][pos+1];
  59             return *str;
  60         }
  61         optind++;
  62         if (optind >= argc) {
  63             optopt = *str;
  64             if (opterr)
  65                 fprintf(stderr, "%s: option requires an argument -- %c\n",
  66                         argv[0], optopt);
  67             return '?';
  68         }
  69         optarg = argv[optind];
  70         optind++; pos = 0;
  71         return *str;
  72     }
  73     else {
  74         pos++;
  75         if (argv[optind][pos] == '\0') {
  76             optind++;
  77             pos = 0;
  78         }
  79         return *str;
  80     }
  81 }