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      1 /*	$NetBSD: devopen.c,v 1.8 2023/02/12 08:25:09 tsutsui Exp $	*/
      2 /*
      3  * Copyright (c) 1994 Rolf Grossmann
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Rolf Grossmann.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <lib/libsa/stand.h>
     33 #include <lib/libkern/libkern.h>
     34 
     35 int devlookup(const char *, int);
     36 int devparse(const char *, int *, int *, int *, int *, char **);
     37 
     38 int
     39 devlookup(const char *d, int len)
     40 {
     41     struct devsw *dp = devsw;
     42     int i;
     43 
     44     for (i = 0; i < ndevs; i++, dp++)
     45 	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
     46 	    return i;
     47 
     48     for (i = 0; i < len; i++)
     49 	printf("%c", d[i]);
     50     printf(": no such device - Configured devices are:\n");
     51     for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     52 	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
     53 	    printf(" %s", dp->dv_name);
     54     printf("\n");
     55     errno = ENXIO;
     56     return -1;
     57 }
     58 
     59 /*
     60  * Parse a device spec.
     61  *
     62  * Format:
     63  *   dev(count, lun, part)file
     64  */
     65 int
     66 devparse(const char *fname, int *dev,
     67 	 int *count, int *lun, int *part, char **file)
     68 {
     69     int i;
     70     const char *s, *args[3];
     71 
     72     /* get device name */
     73     for (s = fname; *s && *s != '/' && *s != '('; s++)
     74 	;
     75 
     76     if (*s == '(') {
     77 	/* lookup device and get index */
     78 	if ((*dev = devlookup(fname, s - fname)) < 0)
     79 	    goto baddev;
     80 
     81 	/* tokenize device ident */
     82 	args[0] = ++s;
     83 	for (i = 1; *s && *s != ')' && i<3; s++) {
     84 	    if (*s == ',')
     85 		args[i++] = ++s;
     86 	}
     87 	if (*s != ')')
     88 	    goto baddev;
     89 
     90 	switch(i) {
     91 	  case 3:
     92 	      *count  = atoi(args[0]);
     93 	      *lun  = atoi(args[1]);
     94 	      *part  = atoi(args[2]);
     95 	      break;
     96 	  case 2:
     97 	      *lun  = atoi(args[0]);
     98 	      *part  = atoi(args[1]);
     99 	      break;
    100 	  case 1:
    101 	      *part  = atoi(args[0]);
    102 	      break;
    103 	  case 0:
    104 	      break;
    105 	}
    106 	*file = (char *)++s;	/* XXX discard const */
    107     }
    108     /* no device present */
    109     else
    110 	*file = (char *)fname;	/* XXX discard const */
    111 
    112     return 0;
    113 
    114 baddev:
    115     return ENXIO;
    116 }
    117 
    118 int
    119 devopen(struct open_file *f, const char *fname, char **file)
    120 {
    121     int error;
    122     int dev;
    123     int count, lun, part;
    124     struct devsw *dp;
    125 
    126     dev   = 0;	/* default device is first in table (usually scsi disk) */
    127     count = 0;
    128     lun   = 0;
    129     part  = 0;
    130 
    131     if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
    132 	return error;
    133 
    134     dp = &devsw[dev];
    135 
    136     if ((void *)dp->dv_open == (void *)nodev)
    137 	return ENXIO;
    138 
    139     f->f_dev = dp;
    140 
    141     if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
    142 	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
    143 	       count, lun, part, error, strerror(error));
    144 
    145     return error;
    146 }
    147