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

   1 /*      $NetBSD: devopen.c,v 1.3 2006/05/10 06:24:03 skrll Exp $        */
   2
   3 /*
   4  * Copyright (c) 2001 Minoura Makoto
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/disklabel.h>
  31 #include <lib/libkern/libkern.h>
  32 #include <lib/libsa/stand.h>
  33 #include "libx68k.h"
  34
  35 extern struct devspec devspec[]; /* defined in conf.c */
  36 int devopen_open_dir = 0;
  37
  38 /*
  39  * Parse a device spec.
  40  *
  41  * sd<unit><part>:<file>
  42  *  unit - 0-7
  43  *  part - a-p
  44  */
  45 int
  46 devparse(const char *fname, int *dev, int *unit, int *part, char **file)
  47 {
  48         char const *s;
  49         int i;
  50
  51         s = fname;
  52         for (i = 0; devspec[i].ds_name != 0; i++) {
  53                 if (strncmp (devspec[i].ds_name, s,
  54                              strlen(devspec[i].ds_name)) == 0)
  55                         break;
  56         }
  57
  58         if (devspec[i].ds_name == 0)
  59                 return ENODEV;
  60         s += strlen(devspec[i].ds_name);
  61         *dev = devspec[i].ds_dev;
  62
  63         *unit = *s++ - '0';
  64         if (*unit < 0 || *unit > devspec[i].ds_maxunit)
  65                 /* bad unit */
  66                 return ENODEV;
  67         *part = *s++ - 'a';
  68         if (*part < 0 || *part > MAXPARTITIONS)
  69                 /* bad partition */
  70                 return ENODEV;
  71
  72         if (*s++ != ':')
  73                 return ENODEV;
  74
  75         if (*s == '/') {
  76                 s++;
  77                 if (devopen_open_dir && *s == 0)
  78                         s--;
  79         }
  80         *file = __UNCONST(s);
  81
  82         return 0;
  83 }
  84
  85 int
  86 devopen(struct open_file *f, const char *fname, char **file)
  87 {
  88         int error;
  89         int dev, unit, part;
  90         struct devsw *dp = &devsw[0];
  91
  92         error = devparse(fname, &dev, &unit, &part, file);
  93         if (error)
  94             return error;
  95
  96         dp = &devsw[dev];
  97
  98         if (!dp->dv_open)
  99                 return ENODEV;
 100
 101         f->f_dev = dp;
 102
 103         if ((error = (*dp->dv_open)(f, unit, part)) == 0)
 104             return 0;
 105
 106         return error;
 107 }