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parseutils.c revision 1.5 
      1 /*	$NetBSD: parseutils.c,v 1.5 2008/12/14 17:03:43 christos 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 	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(const char *opts, int *howto)
     69 {
     70 	int r, tmpopt = 0;
     71 
     72 	opts++; 	/* skip - */
     73 	while (*opts) {
     74 		r = 0;
     75 		BOOT_FLAG(*opts, r);
     76 		if (r == 0) {
     77 			printf("-%c: unknown flag\n", *opts);
     78 			command_help(NULL);
     79 			return 0;
     80 		}
     81 		tmpopt |= r;
     82 		opts++;
     83 		if (*opts == ' ' || *opts == '\t') {
     84 			do
     85 				opts++;		/* skip whitespace */
     86 			while (*opts == ' ' || *opts == '\t');
     87 			if (*opts == '-')
     88 				opts++;		/* skip - */
     89 			else if (*opts != '\0') {
     90 				printf("invalid arguments\n");
     91 				command_help(NULL);
     92 				return 0;
     93 			}
     94 		}
     95 	}
     96 
     97 	*howto = tmpopt;
     98 	return 1;
     99 }
    100 
    101 int
    102 parseboot(char *arg, char **filename, int *howto)
    103 {
    104 	char *opts = NULL;
    105 
    106 	*filename = 0;
    107 	*howto = 0;
    108 
    109 	/* if there were no arguments */
    110 	if (!*arg)
    111 		return 1;
    112 
    113 	/* format is... */
    114 	/* [[xxNx:]filename] [-adqsv] */
    115 
    116 	/* check for just args */
    117 	if (arg[0] == '-')
    118 		opts = arg;
    119 	else {
    120 		/* there's a file name */
    121 		*filename = arg;
    122 
    123 		opts = gettrailer(arg);
    124 		if (!*opts)
    125 			opts = NULL;
    126 		else if (*opts != '-') {
    127 			printf("invalid arguments\n");
    128 			command_help(NULL);
    129 			return 0;
    130 		}
    131 	}
    132 
    133 	/* at this point, we have dealt with filenames. */
    134 
    135 	/* now, deal with options */
    136 	if (opts) {
    137 		if (parseopts(opts, howto) == 0)
    138 			return 0;
    139 	}
    140 
    141 	return 1;
    142 }
    143