text: /*	$NetBSD: parseutils.c,v 1.1 1997/09/17 17:13:03 drochner Exp $	*/
  
  /*
   * Copyright (c) 1996, 1997
   * 	Matthias Drochner.  All rights reserved.
   * Copyright (c) 1996, 1997
   * 	Perry E. Metzger.  All rights reserved.
   * Copyright (c) 1997
   *	Jason R. Thorpe.  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 acknowledgements:
   *	This product includes software developed for the NetBSD Project
   *	by Matthias Drochner.
   *	This product includes software developed for the NetBSD Project
   *	by Perry E. Metzger.
   * 4. The names of the authors may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
   */
  
  #include <lib/libkern/libkern.h>
  #include <lib/libsa/stand.h>
  
  #include "libi386.h"
  
  /*
   * chops the head from the arguments and returns the arguments if any,
   * or possibly an empty string.
   */
  char *
  gettrailer(arg)
  	char *arg;
  {
  	char *options;
  
  	if ((options = strchr(arg, ' ')) == NULL)
  		return ("");
  	else
  		*options++ = '\0';
  
  	/* trim leading blanks */
  	while (*options && *options == ' ')
  		options++;
  
  	return (options);
  }
  
  int
  parseopts(opts, howto)
  	char *opts;
  	int *howto;
  {
  	int r, tmpopt = 0;
  
  	opts++; 	/* skip - */
  	while (*opts && *opts != ' ') {
  		r = netbsd_opt(*opts);
  		if (r == -1) {
  			printf("-%c: unknown flag\n", *opts);
  			command_help(NULL);
  			return(0);
  		}
  		tmpopt |= r;
  		opts++;
  	}
  
  	*howto = tmpopt;
  	return(1);
  }
  
  int
  parseboot(arg, filename, howto)
  	char *arg;
  	char **filename;
  	int *howto;
  {
  	char *opts = NULL;
  
  	*filename = 0;
  	*howto = 0;
  
  	/* if there were no arguments */
  	if (!*arg)
  		return(1);
  
  	/* format is... */
  	/* [[xxNx:]filename] [-adrs] */
  
  	/* check for just args */
  	if (arg[0] == '-')
  		opts = arg;
  	else {
  		/* there's a file name */
  		*filename = arg;
  
  		opts = gettrailer(arg);
  		if (!*opts)
  			opts = NULL;
  		else if (*opts != '-') {
  			printf("invalid arguments\n");
  			command_help(NULL);
  			return(0);
  		}
  	}
  
  	/* at this point, we have dealt with filenames. */
  
  	/* now, deal with options */
  	if (opts) {
  		if (parseopts(opts, howto) == 0)
  			return(0);
  	}
  
  	return(1);
  }
  