152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/* $NetBSD: parseutils.c,v 1.6 2011/08/18 13:20:04 christos Exp $ */
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/*
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* Copyright (c) 1996, 1997
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* Matthias Drochner. All rights reserved.
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* Copyright (c) 1996, 1997
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* Perry E. Metzger. All rights reserved.
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* Copyright (c) 1997
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* Jason R. Thorpe. All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgements:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* This product includes software developed for the NetBSD Project
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* by Perry E. Metzger.
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* 4. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <lib/libkern/libkern.h>
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#include <lib/libsa/stand.h>
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#include <sys/boot_flag.h>
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#include "libi386.h"
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/*
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* chops the head from the arguments and returns the arguments if any,
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* or possibly an empty string.
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*/
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char *
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gettrailer(char *arg)
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{
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char *options;
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for (options = arg; *options; options++) {
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switch (*options) {
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case ' ':
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case '\t':
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*options++ = '\0';
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break;
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default:
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continue;
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}
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break;
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}
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if (*options == '\0')
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return "";
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/* trim leading blanks/tabs */
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while (*options == ' ' || *options == '\t')
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options++;
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return options;
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}
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int
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parseopts(const char *opts, int *howto)
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{
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int r, tmpopt = 0;
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opts++; /* skip - */
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while (*opts) {
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r = 0;
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BOOT_FLAG(*opts, r);
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if (r == 0) {
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printf("-%c: unknown flag\n", *opts);
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command_help(NULL);
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return 0;
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}
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tmpopt |= r;
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opts++;
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if (*opts == ' ' || *opts == '\t') {
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do
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opts++; /* skip whitespace */
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while (*opts == ' ' || *opts == '\t');
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if (*opts == '-')
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opts++; /* skip - */
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else if (*opts != '\0') {
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printf("invalid arguments\n");
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command_help(NULL);
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return 0;
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}
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}
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}
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*howto = tmpopt;
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return 1;
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}
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int
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parseboot(char *arg, char **filename, int *howto)
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{
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char *opts = NULL;
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*filename = 0;
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*howto = 0;
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/* if there were no arguments */
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if (!*arg)
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return 1;
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/* format is... */
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/* [[xxNx:]filename] [-adqsv] */
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/* check for just args */
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if (arg[0] == '-')
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opts = arg;
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else {
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/* there's a file name */
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*filename = arg;
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opts = gettrailer(arg);
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if (!*opts)
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opts = NULL;
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else if (*opts != '-') {
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printf("invalid arguments\n");
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command_help(NULL);
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return 0;
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}
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}
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/* at this point, we have dealt with filenames. */
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/* now, deal with options */
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if (opts) {
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if (parseopts(opts, howto) == 0)
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return 0;
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}
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return 1;
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}
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