/*      $NetBSD: parseutils.c,v 1.7 2014/01/05 20:52:57 jakllsch Exp $  */

/*
 * Copyright (c) 1996, 1997
 *      Matthias Drochner.  All rights reserved.
 * Copyright (c) 1996, 1997
 *      Perry E. Metzger.  All rights reserved.
 * Copyright (c) 1997
 *      Jason R. Thorpe.  All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgements:
 *      This product includes software developed for the NetBSD Project
 *      by Matthias Drochner.
 *      This product includes software developed for the NetBSD Project
 *      by Perry E. Metzger.
 * 4. The names of the authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <lib/libkern/libkern.h>
#include <lib/libsa/stand.h>
#include <sys/boot_flag.h>

#include "libi386.h"

/*
 * chops the head from the arguments and returns the arguments if any,
 * or possibly an empty string.
 */
char *
gettrailer(char *arg)
{
        char *options;

        for (options = arg; *options; options++) {
                switch (*options) {
                case ' ':
                case '\t':
                        *options++ = '\0';
                        break;
                default:
                        continue;
                }
                break;
        }
        if (*options == '\0')
                return options;

        /* trim leading blanks/tabs */
        while (*options == ' ' || *options == '\t')
                options++;

        return options;
}

int
parseopts(const char *opts, int *howto)
{
        int r, tmpopt = 0;

        opts++;         /* skip - */
        while (*opts) {
                r = 0;
                BOOT_FLAG(*opts, r);
                if (r == 0) {
                        printf("-%c: unknown flag\n", *opts);
                        command_help(NULL);
                        return 0;
                }
                tmpopt |= r;
                opts++;
                if (*opts == ' ' || *opts == '\t') {
                        do
                                opts++;         /* skip whitespace */
                        while (*opts == ' ' || *opts == '\t');
                        if (*opts == '-')
                                opts++;         /* skip - */
                        else if (*opts != '\0') {
                                printf("invalid arguments\n");
                                command_help(NULL);
                                return 0;
                        }
                }
        }

        *howto = tmpopt;
        return 1;
}

int
parseboot(char *arg, char **filename, int *howto)
{
        char *opts = NULL;

        *filename = 0;
        *howto = 0;

        /* if there were no arguments */
        if (!*arg)
                return 1;

        /* format is... */
        /* [[xxNx:]filename] [-adqsv] */

        /* check for just args */
        if (arg[0] == '-')
                opts = arg;
        else {
                /* there's a file name */
                *filename = arg;

                opts = gettrailer(arg);
                if (!*opts)
                        opts = NULL;
                else if (*opts != '-') {
                        printf("invalid arguments\n");
                        command_help(NULL);
                        return 0;
                }
        }

        /* at this point, we have dealt with filenames. */

        /* now, deal with options */
        if (opts) {
                if (parseopts(opts, howto) == 0)
                        return 0;
        }

        return 1;
}