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getopt.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if _lib_getopt

NoN(getopt)

#else

#undef      _BLD_ast    /* enable ast imports since we're user static */

#include <error.h>
#include <option.h>

int         opterr = 1;
int         optind = 1;
int         optopt = 0;
char*       optarg = 0;

static int  lastoptind;

extern int
getopt(int argc, char* const* argv, const char* optstring)
{
      int   n;

      NoP(argc);
      opt_info.index = (optind > 1 || optind == lastoptind) ? optind : 0;
      if (opt_info.index >= argc)
            return -1;
      switch (n = optget((char**)argv, optstring))
      {
      case ':':
            n = '?';
            /*FALLTHROUGH*/
      case '?':
            if (opterr && (!optstring || *optstring != ':'))
            {
                  if (!error_info.id)
                        error_info.id = argv[0];
                  errormsg(NiL, 2, opt_info.arg);
            }
            optopt = opt_info.option[1];
            break;
      case 0:
            n = -1;
            break;
      }
      optarg = opt_info.arg;
      lastoptind = optind = opt_info.index;
      return n;
}

#endif

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