sys/arch/x68k/stand/libsa/parseutils.c

   1 /*      $NetBSD: parseutils.c,v 1.1 2001/09/27 10:03:28 minoura Exp $   */
   2
   3 /*
   4  *      from /sys/arch/i386/lib/parseutils.c
   5  *      NetBSD: parseutils.c,v 1.3 2000/09/24 12:32:35 jdolecek Exp
   6  */
   7
   8 /*
   9  * Copyright (c) 1996, 1997
  10  *      Matthias Drochner.  All rights reserved.
  11  * Copyright (c) 1996, 1997
  12  *      Perry E. Metzger.  All rights reserved.
  13  * Copyright (c) 1997
  14  *      Jason R. Thorpe.  All rights reserved
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. All advertising materials mentioning features or use of this software
  25  *    must display the following acknowledgements:
  26  *      This product includes software developed for the NetBSD Project
  27  *      by Matthias Drochner.
  28  *      This product includes software developed for the NetBSD Project
  29  *      by Perry E. Metzger.
  30  * 4. The names of the authors may not be used to endorse or promote products
  31  *    derived from this software without specific prior written permission.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  34  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  35  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  36  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  37  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  38  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  39  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  40  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  41  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  42  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  43  */
  44
  45 #include <lib/libkern/libkern.h>
  46 #include <lib/libsa/stand.h>
  47 #include <sys/boot_flag.h>
  48
  49 #include "libx68k.h"
  50
  51
  52 /*
  53  * chops the head from the arguments and returns the arguments if any,
  54  * or possibly an empty string.
  55  */
  56 char *
  57 gettrailer(char *arg)
  58 {
  59         char *options;
  60
  61         if ((options = strchr(arg, ' ')) == NULL)
  62                 return "";
  63         else
  64                 *options++ = '\0';
  65
  66         /* trim leading blanks */
  67         while (*options && *options == ' ')
  68                 options++;
  69
  70         return options;
  71 }
  72
  73 int
  74 parseopts(const char *opts, int *howto)
  75 {
  76         int r, tmpopt = 0;
  77
  78         opts++;         /* skip - */
  79         while (*opts && *opts != ' ') {
  80                 r = 0;
  81                 BOOT_FLAG(*opts, r);
  82                 if (r == 0) {
  83                         printf("-%c: unknown flag\n", *opts);
  84                         return 0;
  85                 }
  86                 tmpopt |= r;
  87                 opts++;
  88         }
  89
  90         *howto = tmpopt;
  91         return 1;
  92 }
  93
  94 int
  95 parseboot(char *arg, char **filename, int *howto)
  96 {
  97         char *opts = NULL;
  98
  99         *filename = 0;
 100         *howto = 0;
 101
 102         /* if there were no arguments */
 103         if (!*arg)
 104                 return 1;
 105
 106         /* format is... */
 107         /* [[xxNx:]filename] [-adqsv] */
 108
 109         /* check for just args */
 110         if (arg[0] == '-') {
 111                 opts = arg;
 112         } else {
 113                 /* there's a file name */
 114                 *filename = arg;
 115
 116                 opts = gettrailer(arg);
 117                 if (!*opts) {
 118                         opts = NULL;
 119                 } else if (*opts != '-') {
 120                         printf("invalid arguments\n");
 121                         return 0;
 122                 }
 123         }
 124
 125         /* at this point, we have dealt with filenames. */
 126
 127         /* now, deal with options */
 128         if (opts) {
 129                 if (parseopts(opts, howto) == 0)
 130                         return 0;
 131         }
 132
 133         return 1;
 134 }