sys/arch/i386/stand/lib/parseutils.c

   1 /*      $NetBSD: parseutils.c,v 1.4 2008/12/09 15:38:52 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 }