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parseutils.c revision 1.1 
      1 /*	$NetBSD: parseutils.c,v 1.1 2001/09/27 10:03:28 minoura Exp $	*/
      2 
      3 /*
      4  *	from /sys/arch/i386/lib/parseutils.c
      5  *	NetBSD: parseutils.c,v 1.3 2000/09/24 12:32:35 jdolecek Exp
      6  */
      7 
      8 /*
      9  * Copyright (c) 1996, 1997
     10  * 	Matthias Drochner.  All rights reserved.
     11  * Copyright (c) 1996, 1997
     12  * 	Perry E. Metzger.  All rights reserved.
     13  * Copyright (c) 1997
     14  *	Jason R. Thorpe.  All rights reserved
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. All advertising materials mentioning features or use of this software
     25  *    must display the following acknowledgements:
     26  *	This product includes software developed for the NetBSD Project
     27  *	by Matthias Drochner.
     28  *	This product includes software developed for the NetBSD Project
     29  *	by Perry E. Metzger.
     30  * 4. The names of the authors may not be used to endorse or promote products
     31  *    derived from this software without specific prior written permission.
     32  *
     33  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     34  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     35  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     36  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     37  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     38  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     39  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     40  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     41  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     42  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     43  */
     44 
     45 #include <lib/libkern/libkern.h>
     46 #include <lib/libsa/stand.h>
     47 #include <sys/boot_flag.h>
     48 
     49 #include "libx68k.h"
     50 
     51 
     52 /*
     53  * chops the head from the arguments and returns the arguments if any,
     54  * or possibly an empty string.
     55  */
     56 char *
     57 gettrailer(arg)
     58 	char *arg;
     59 {
     60 	char *options;
     61 
     62 	if ((options = strchr(arg, ' ')) == NULL)
     63 		return ("");
     64 	else
     65 		*options++ = '\0';
     66 
     67 	/* trim leading blanks */
     68 	while (*options && *options == ' ')
     69 		options++;
     70 
     71 	return (options);
     72 }
     73 
     74 int
     75 parseopts(opts, howto)
     76 	const char *opts;
     77 	int *howto;
     78 {
     79 	int r, tmpopt = 0;
     80 
     81 	opts++; 	/* skip - */
     82 	while (*opts && *opts != ' ') {
     83 		r = 0;
     84 		BOOT_FLAG(*opts, r);
     85 		if (r == 0) {
     86 			printf("-%c: unknown flag\n", *opts);
     87 			return(0);
     88 		}
     89 		tmpopt |= r;
     90 		opts++;
     91 	}
     92 
     93 	*howto = tmpopt;
     94 	return(1);
     95 }
     96 
     97 int
     98 parseboot(arg, filename, howto)
     99 	char *arg;
    100 	char **filename;
    101 	int *howto;
    102 {
    103 	char *opts = NULL;
    104 
    105 	*filename = 0;
    106 	*howto = 0;
    107 
    108 	/* if there were no arguments */
    109 	if (!*arg)
    110 		return(1);
    111 
    112 	/* format is... */
    113 	/* [[xxNx:]filename] [-adqsv] */
    114 
    115 	/* check for just args */
    116 	if (arg[0] == '-')
    117 		opts = arg;
    118 	else {
    119 		/* there's a file name */
    120 		*filename = arg;
    121 
    122 		opts = gettrailer(arg);
    123 		if (!*opts)
    124 			opts = NULL;
    125 		else if (*opts != '-') {
    126 			printf("invalid arguments\n");
    127 			return(0);
    128 		}
    129 	}
    130 
    131 	/* at this point, we have dealt with filenames. */
    132 
    133 	/* now, deal with options */
    134 	if (opts) {
    135 		if (parseopts(opts, howto) == 0)
    136 			return(0);
    137 	}
    138 
    139 	return(1);
    140 }
    141