/*      $NetBSD: devopen.c,v 1.8 2023/02/12 08:25:09 tsutsui Exp $      */
/*
* Copyright (c) 1994 Rolf Grossmann
* 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 acknowledgement:
*      This product includes software developed by Rolf Grossmann.
* 4. The name of the author 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/libsa/stand.h>
#include <lib/libkern/libkern.h>

int devlookup(const char *, int);
int devparse(const char *, int *, int *, int *, int *, char **);

int
devlookup(const char *d, int len)
{
   struct devsw *dp = devsw;
   int i;

   for (i = 0; i < ndevs; i++, dp++)
       if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
           return i;

   for (i = 0; i < len; i++)
       printf("%c", d[i]);
   printf(": no such device - Configured devices are:\n");
   for (dp = devsw, i = 0; i < ndevs; i++, dp++)
       if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
           printf(" %s", dp->dv_name);
   printf("\n");
   errno = ENXIO;
   return -1;
}

/*
* Parse a device spec.
*
* Format:
*   dev(count, lun, part)file
*/
int
devparse(const char *fname, int *dev,
        int *count, int *lun, int *part, char **file)
{
   int i;
   const char *s, *args[3];

   /* get device name */
   for (s = fname; *s && *s != '/' && *s != '('; s++)
       ;

   if (*s == '(') {
       /* lookup device and get index */
       if ((*dev = devlookup(fname, s - fname)) < 0)
           goto baddev;

       /* tokenize device ident */
       args[0] = ++s;
       for (i = 1; *s && *s != ')' && i<3; s++) {
           if (*s == ',')
               args[i++] = ++s;
       }
       if (*s != ')')
           goto baddev;

       switch(i) {
         case 3:
             *count  = atoi(args[0]);
             *lun  = atoi(args[1]);
             *part  = atoi(args[2]);
             break;
         case 2:
             *lun  = atoi(args[0]);
             *part  = atoi(args[1]);
             break;
         case 1:
             *part  = atoi(args[0]);
             break;
         case 0:
             break;
       }
       *file = (char *)++s;    /* XXX discard const */
   }
   /* no device present */
   else
       *file = (char *)fname;  /* XXX discard const */

   return 0;

baddev:
   return ENXIO;
}

int
devopen(struct open_file *f, const char *fname, char **file)
{
   int error;
   int dev;
   int count, lun, part;
   struct devsw *dp;

   dev   = 0;  /* default device is first in table (usually scsi disk) */
   count = 0;
   lun   = 0;
   part  = 0;

   if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
       return error;

   dp = &devsw[dev];

   if ((void *)dp->dv_open == (void *)nodev)
       return ENXIO;

   f->f_dev = dp;

   if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
       printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
              count, lun, part, error, strerror(error));

   return error;
}