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parseutils.c revision 1.1 
      1 /*	$NetBSD: parseutils.c,v 1.1 1997/09/17 17:13:03 drochner Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996, 1997
      5  * 	Matthias Drochner.  All rights reserved.
      6  * Copyright (c) 1996, 1997
      7  * 	Perry E. Metzger.  All rights reserved.
      8  * Copyright (c) 1997
      9  *	Jason R. Thorpe.  All rights reserved
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgements:
     21  *	This product includes software developed for the NetBSD Project
     22  *	by Matthias Drochner.
     23  *	This product includes software developed for the NetBSD Project
     24  *	by Perry E. Metzger.
     25  * 4. The names of the authors may not be used to endorse or promote products
     26  *    derived from this software without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     29  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     30  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     31  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     32  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     33  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     37  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #include <lib/libkern/libkern.h>
     41 #include <lib/libsa/stand.h>
     42 
     43 #include "libi386.h"
     44 
     45 /*
     46  * chops the head from the arguments and returns the arguments if any,
     47  * or possibly an empty string.
     48  */
     49 char *
     50 gettrailer(arg)
     51 	char *arg;
     52 {
     53 	char *options;
     54 
     55 	if ((options = strchr(arg, ' ')) == NULL)
     56 		return ("");
     57 	else
     58 		*options++ = '\0';
     59 
     60 	/* trim leading blanks */
     61 	while (*options && *options == ' ')
     62 		options++;
     63 
     64 	return (options);
     65 }
     66 
     67 int
     68 parseopts(opts, howto)
     69 	char *opts;
     70 	int *howto;
     71 {
     72 	int r, tmpopt = 0;
     73 
     74 	opts++; 	/* skip - */
     75 	while (*opts && *opts != ' ') {
     76 		r = netbsd_opt(*opts);
     77 		if (r == -1) {
     78 			printf("-%c: unknown flag\n", *opts);
     79 			command_help(NULL);
     80 			return(0);
     81 		}
     82 		tmpopt |= r;
     83 		opts++;
     84 	}
     85 
     86 	*howto = tmpopt;
     87 	return(1);
     88 }
     89 
     90 int
     91 parseboot(arg, filename, howto)
     92 	char *arg;
     93 	char **filename;
     94 	int *howto;
     95 {
     96 	char *opts = NULL;
     97 
     98 	*filename = 0;
     99 	*howto = 0;
    100 
    101 	/* if there were no arguments */
    102 	if (!*arg)
    103 		return(1);
    104 
    105 	/* format is... */
    106 	/* [[xxNx:]filename] [-adrs] */
    107 
    108 	/* check for just args */
    109 	if (arg[0] == '-')
    110 		opts = arg;
    111 	else {
    112 		/* there's a file name */
    113 		*filename = arg;
    114 
    115 		opts = gettrailer(arg);
    116 		if (!*opts)
    117 			opts = NULL;
    118 		else if (*opts != '-') {
    119 			printf("invalid arguments\n");
    120 			command_help(NULL);
    121 			return(0);
    122 		}
    123 	}
    124 
    125 	/* at this point, we have dealt with filenames. */
    126 
    127 	/* now, deal with options */
    128 	if (opts) {
    129 		if (parseopts(opts, howto) == 0)
    130 			return(0);
    131 	}
    132 
    133 	return(1);
    134 }
    135