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      1 /*	$NetBSD: parseutils.c,v 1.7 2014/01/05 20:52:57 jakllsch 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 #include <sys/boot_flag.h>
     43 
     44 #include "libi386.h"
     45 
     46 /*
     47  * chops the head from the arguments and returns the arguments if any,
     48  * or possibly an empty string.
     49  */
     50 char *
     51 gettrailer(char *arg)
     52 {
     53 	char *options;
     54 
     55 	for (options = arg; *options; options++) {
     56 		switch (*options) {
     57 		case ' ':
     58 		case '\t':
     59 			*options++ = '\0';
     60 			break;
     61 		default:
     62 			continue;
     63 		}
     64 		break;
     65 	}
     66 	if (*options == '\0')
     67 		return options;
     68 
     69 	/* trim leading blanks/tabs */
     70 	while (*options == ' ' || *options == '\t')
     71 		options++;
     72 
     73 	return options;
     74 }
     75 
     76 int
     77 parseopts(const char *opts, int *howto)
     78 {
     79 	int r, tmpopt = 0;
     80 
     81 	opts++; 	/* skip - */
     82 	while (*opts) {
     83 		r = 0;
     84 		BOOT_FLAG(*opts, r);
     85 		if (r == 0) {
     86 			printf("-%c: unknown flag\n", *opts);
     87 			command_help(NULL);
     88 			return 0;
     89 		}
     90 		tmpopt |= r;
     91 		opts++;
     92 		if (*opts == ' ' || *opts == '\t') {
     93 			do
     94 				opts++;		/* skip whitespace */
     95 			while (*opts == ' ' || *opts == '\t');
     96 			if (*opts == '-')
     97 				opts++;		/* skip - */
     98 			else if (*opts != '\0') {
     99 				printf("invalid arguments\n");
    100 				command_help(NULL);
    101 				return 0;
    102 			}
    103 		}
    104 	}
    105 
    106 	*howto = tmpopt;
    107 	return 1;
    108 }
    109 
    110 int
    111 parseboot(char *arg, char **filename, int *howto)
    112 {
    113 	char *opts = NULL;
    114 
    115 	*filename = 0;
    116 	*howto = 0;
    117 
    118 	/* if there were no arguments */
    119 	if (!*arg)
    120 		return 1;
    121 
    122 	/* format is... */
    123 	/* [[xxNx:]filename] [-adqsv] */
    124 
    125 	/* check for just args */
    126 	if (arg[0] == '-')
    127 		opts = arg;
    128 	else {
    129 		/* there's a file name */
    130 		*filename = arg;
    131 
    132 		opts = gettrailer(arg);
    133 		if (!*opts)
    134 			opts = NULL;
    135 		else if (*opts != '-') {
    136 			printf("invalid arguments\n");
    137 			command_help(NULL);
    138 			return 0;
    139 		}
    140 	}
    141 
    142 	/* at this point, we have dealt with filenames. */
    143 
    144 	/* now, deal with options */
    145 	if (opts) {
    146 		if (parseopts(opts, howto) == 0)
    147 			return 0;
    148 	}
    149 
    150 	return 1;
    151 }
    152