text: /* $Id$ */
  
  /*
   * Copyright (c) 1987, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #if 0
  static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
  __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
  #endif
  
  #include <stdio.h>
  #include <string.h>
  
  int	opterr = 1,		/* if error message should be printed */
  	optind = 1,		/* index into parent argv vector */
  	optopt,			/* character checked for validity */
  	optreset;		/* reset getopt */
  char	*optarg;		/* argument associated with option */
  
  #define	BADCH	(int)'?'
  #define	BADARG	(int)':'
  #define	EMSG	""
  
  /*
   * getopt --
   *	Parse argc/argv argument vector.
   */
  int
  getopt(int argc, char * const argv[], const char *optstring)
  {
  	static char *place = EMSG;		/* option letter processing */
  	char *oli;				/* option letter list index */
  
  	if (optreset || *place == 0) {		/* update scanning pointer */
  		optreset = 0;
  		place = argv[optind];
  		if (optind >= argc || *place++ != '-') {
  			/* Argument is absent or is not an option */
  			place = EMSG;
  			return (-1);
  		}
  		optopt = *place++;
  		if (optopt == '-' && *place == 0) {
  			/* "--" => end of options */
  			++optind;
  			place = EMSG;
  			return (-1);
  		}
  		if (optopt == 0) {
  			/* Solitary '-', treat as a '-' option
  			   if the program (eg su) is looking for it. */
  			place = EMSG;
  			if (strchr(optstring, '-') == NULL)
  				return -1;
  			optopt = '-';
  		}
  	} else
  		optopt = *place++;
  
  	/* See if option letter is one the caller wanted... */
  	if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
  		if (*place == 0)
  			++optind;
  		if (opterr && *optstring != ':')
  			(void)fprintf(stderr,
                                        "unknown option -- %c\n", optopt);
  		return (BADCH);
  	}
  
  	/* Does this option need an argument? */
  	if (oli[1] != ':') {
  		/* don't need argument */
  		optarg = NULL;
  		if (*place == 0)
  			++optind;
  	} else {
  		/* Option-argument is either the rest of this argument or the
  		   entire next argument. */
  		if (*place)
  			optarg = place;
  		else if (argc > ++optind)
  			optarg = argv[optind];
  		else {
  			/* option-argument absent */
  			place = EMSG;
  			if (*optstring == ':')
  				return (BADARG);
  			if (opterr)
  				(void)fprintf(stderr,
                                          "option requires an argument -- %c\n",
                                          optopt);
  			return (BADCH);
  		}
  		place = EMSG;
  		++optind;
  	}
  	return (optopt);			/* return option letter */
  }
  