text: /*
   * 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(LIBC_SCCS) && !defined(lint)
  static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
  #endif /* LIBC_SCCS and not lint */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "getopt.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 nargc, char * const *nargv, const char *ostr)
  {
  	char *cp;
  	static char *__progname;
  	static char *place = EMSG;		/* option letter processing */
  	char *oli;				/* option letter list index */
  
  	if (__progname == NULL) {
  		if ((cp = strrchr(nargv[0], '/')) != NULL)
  			__progname = cp + 1;
  		else
  			__progname = nargv[0];
  	}
  	if (optreset || !*place) {		/* update scanning pointer */
  		optreset = 0;
  		if (optind >= nargc || *(place = nargv[optind]) != '-') {
  			place = EMSG;
  			return (-1);
  		}
  		if (place[1] && *++place == '-') {	/* found "--" */
  			++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 */
  }
  