text: /* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */
  /*	$NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink Exp $	*/
  
  /*
   * 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. 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 !defined(HAVE_GETOPT) || !defined(HAVE_UNISTD_H)
  #if 0
  static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
  #endif
  
  #include <assert.h>
  #include <errno.h>
  #include <stdio.h>
  #include <string.h>
  #include "k5-platform.h"
  
  #define __P(x) x
  #define _DIAGASSERT(x) assert(x)
  
  int	opterr = 1,		/* if error message should be printed */
  	optind = 1,		/* index into parent argv vector */
  	optopt;			/* character checked for validity */
  char	*optarg;		/* argument associated with option */
  
  static char * _progname __P((char *));
  int getopt_internal __P((int, char * const *, const char *));
  
  static char *
  _progname(nargv0)
  	char * nargv0;
  {
  	char * tmp;
  
  	_DIAGASSERT(nargv0 != NULL);
  
  	tmp = strrchr(nargv0, '/');
  	if (tmp)
  		tmp++;
  	else
  		tmp = nargv0;
  	return(tmp);
  }
  
  #define	BADCH	(int)'?'
  #define	BADARG	(int)':'
  #define	EMSG	""
  
  /*
   * getopt --
   *	Parse argc/argv argument vector.
   */
  int
  getopt(nargc, nargv, ostr)
  	int nargc;
  	char * const nargv[];
  	const char *ostr;
  {
  	static char *__progname = 0;
  	static char *place = EMSG;		/* option letter processing */
  	char *oli;				/* option letter list index */
  	__progname = __progname?__progname:_progname(*nargv);
  
  	_DIAGASSERT(nargv != NULL);
  	_DIAGASSERT(ostr != NULL);
  
  	if (!*place) {		/* update scanning pointer */
  		if (optind >= nargc || *(place = nargv[optind]) != '-') {
  			place = EMSG;
  			return (-1);
  		}
  		if (place[1] && *++place == '-'	/* found "--" */
  		    && place[1] == '\0') {
  			++optind;
  			place = EMSG;
  			return (-1);
  		}
  	}					/* option letter okay? */
  	if ((optopt = (int)*place++) == (int)':' ||
  	    !(oli = strchr(ostr, optopt))) {
  		/*
  		 * if the user didn't specify '-' as an option,
  		 * assume it means -1.
  		 */
  		if (optopt == (int)'-')
  			return (-1);
  		if (!*place)
  			++optind;
  		if (opterr && *ostr != ':')
  			(void)fprintf(stderr,
  			    "%s: illegal option -- %c\n", __progname, optopt);
  		return (BADCH);
  	}
  	if (*++oli != ':') {			/* don't need argument */
  		optarg = NULL;
  		if (!*place)
  			++optind;
  	}
  	else {					/* need an argument */
  		if (*place)			/* no white space */
  			optarg = place;
  		else if (nargc <= ++optind) {	/* no arg */
  			place = EMSG;
  			if (*ostr == ':')
  				return (BADARG);
  			if (opterr)
  				(void)fprintf(stderr,
  				    "%s: option requires an argument -- %c\n",
  				    __progname, optopt);
  			return (BADCH);
  		}
  		else				/* white space */
  			optarg = nargv[optind];
  		place = EMSG;
  		++optind;
  	}
  	return (optopt);			/* dump back option letter */
  }
  #endif /* !defined(HAVE_GETOPT) || !defined(HAVE_UNISTD_H) */
  