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 */
50char *
51gettrailer(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 "";
68
69	/* trim leading blanks/tabs */
70	while (*options == ' ' || *options == '\t')
71		options++;
72
73	return options;
74}
75
76int
77parseopts(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
110int
111parseboot(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