/*      $NetBSD: devopen.c,v 1.11 2012/12/19 13:53:47 kiyohara Exp $    */

/*-
*  Copyright (c) 1993 John Brezak
*  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. 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>
#include <sys/param.h>
#include <sys/reboot.h>

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


/*
* Parse a device spec.
*   i.e.
*     /dev/disk/floppy
*     /dev/disk/ide/0/master/0_n
*     /dev/disk/ide/0/slave/0_n
*     /dev/disk/scsi/000/0_n
*     /dev/disk/scsi/030/0_n
*/
static int
devparse(const char *fname, int *dev, int *ctlr, int *unit, int *lunit,
        int *part, char **file)
{
       int i;
       char devdir[] = "/dev/disk/";
       char floppy[] = "floppy";
       char ide[] = "ide";
       char scsi[] = "scsi";
       char *p;

       if (strncmp(fname, devdir, strlen(devdir)) != 0)
               return EINVAL;
       p = __UNCONST(fname) + strlen(devdir);

       if (strncmp(p, floppy, strlen(floppy)) == 0) {
               p += strlen(floppy);
               for (i = 0; devsw[i].dv_name != NULL; i++)
                       if (strcmp(devsw[i].dv_name, "fd") == 0) {
                               *dev = i;
                               *ctlr = 0;
                               *unit = 1;
                               *lunit = 0;
                               break;
                       }
       } else if (strncmp(p, ide, strlen(ide)) == 0) {
               char master[] = "master";
               char slave[] = "slave";

               p += strlen(ide);
               if (*p++ != '/' ||
                   !isdigit(*p++) ||
                   *p++ != '/')
                       return EINVAL;
               *ctlr = *(p - 2) - '0';
               if (strncmp(p, master, strlen(master)) == 0) {
                       *unit = 0;
                       p += strlen(master);
               } else if (strncmp(p, slave, strlen(slave)) == 0) {
                       *unit = 1;
                       p += strlen(slave);
               } else
                       return EINVAL;
               if (*p++ != '/' ||
                   !isdigit(*p++) ||
                   *p++ != '_' ||
                   !isdigit(*p++))
                       return EINVAL;
               *lunit = *(p - 3) - '0';
               *part = *(p - 1) - '0';
               for (i = 0; devsw[i].dv_name != NULL; i++)
                       if (strcmp(devsw[i].dv_name, "wd") == 0) {
                               *dev = i;
                               break;
                       }
               if (devsw[i].dv_name == NULL)
                       return EINVAL;
       } else if (strncmp(p, scsi, strlen(scsi)) == 0) {
               p += strlen(scsi);
               if (*p++ != '/' ||
                   !isdigit(*p++) ||
                   !isdigit(*p++) ||
                   !isdigit(*p++) ||
                   *p++ != '/' ||
                   !isdigit(*p++) ||
                   *p++ != '_' ||
                   !isdigit(*p++))
                       return EINVAL;
               *ctlr = *(p - 7) - '0';
               *unit = *(p - 6) - '0';
               *lunit = *(p - 5) - '0';
               *part = *(p - 1) - '0';
               for (i = 0; devsw[i].dv_name != NULL; i++)
                       if (strcmp(devsw[i].dv_name, "sd") == 0) {
                               *dev = i;
                               break;
                       }
               if (devsw[i].dv_name == NULL)
                       return EINVAL;
       }

       if (*p++ != ':')
               return EINVAL;
       *file = p;
       return 0;
}

int
devopen(struct open_file *f, const char *fname, char **file)
{
       int error;
       int dev = 0, ctlr = 0, unit = 0, lunit = 0, part = 0;
       struct devsw *dp = &devsw[0];
       extern struct devsw pseudo_devsw;

       **file = '\0';
       error = devparse(fname, &dev, &ctlr, &unit, &lunit, &part, file);
       if (error == 0) {
               dp = &devsw[dev];
               if (!dp->dv_open)
                       return ENODEV;
       } else {
               if (strcmp(fname, "in") == 0)
                       /* special case: kernel in memory */
                       dp = &pseudo_devsw;
               else
                       return error;
       }

       f->f_dev = dp;
       if ((error = (*dp->dv_open)(f, ctlr, unit, lunit, part)) == 0)
               return 0;

       printf("%s %s\n", fname, strerror(error));

       return error;
}