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devopen.c revision 1.3 
      1 /*	$NetBSD: devopen.c,v 1.3 2005/01/19 01:58:21 chs 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 atoi(const char *);
     36 int devlookup(const char *, int);
     37 int devparse(const char *, int *, char *, char *, char *, char **);
     38 
     39 int
     40 atoi(const char *cp)
     41 {
     42     int val = 0;
     43 
     44     while(isdigit(*cp))
     45 	val = val * 10 + (*cp++ - '0');
     46     return val;
     47 }
     48 
     49 int
     50 devlookup(const char *d, int len)
     51 {
     52     struct devsw *dp = devsw;
     53     int i;
     54 
     55     for (i = 0; i < ndevs; i++, dp++)
     56 	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
     57 	    return i;
     58 
     59     for (i = 0; i < len; i++)
     60 	printf("%c", d[i]);
     61     printf(": no such device - Configured devices are:\n");
     62     for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     63 	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
     64 	    printf(" %s", dp->dv_name);
     65     printf("\n");
     66     errno = ENXIO;
     67     return -1;
     68 }
     69 
     70 /*
     71  * Parse a device spec.
     72  *
     73  * Format:
     74  *   dev(count, lun, part)file
     75  */
     76 int
     77 devparse(const char *fname, int *dev,
     78 	 char *count, char *lun, char *part, char **file)
     79 {
     80     int i;
     81     const char *s, *args[3];
     82 
     83     /* get device name */
     84     for (s = fname; *s && *s != '/' && *s != '('; s++)
     85 	;
     86 
     87     if (*s == '(') {
     88 	/* lookup device and get index */
     89 	if ((*dev = devlookup(fname, s - fname)) < 0)
     90 	    goto baddev;
     91 
     92 	/* tokenize device ident */
     93 	args[0] = ++s;
     94 	for (i = 1; *s && *s != ')' && i<3; s++) {
     95 	    if (*s == ',')
     96 		args[i++] = ++s;
     97 	}
     98 	if (*s != ')')
     99 	    goto baddev;
    100 
    101 	switch(i) {
    102 	  case 3:
    103 	      *count  = atoi(args[0]);
    104 	      *lun  = atoi(args[1]);
    105 	      *part  = atoi(args[2]);
    106 	      break;
    107 	  case 2:
    108 	      *lun  = atoi(args[0]);
    109 	      *part  = atoi(args[1]);
    110 	      break;
    111 	  case 1:
    112 	      *part  = atoi(args[0]);
    113 	      break;
    114 	  case 0:
    115 	      break;
    116 	}
    117 	*file = (char *)++s;	/* XXX discard const */
    118     }
    119     /* no device present */
    120     else
    121 	*file = (char *)fname;	/* XXX discard const */
    122 
    123     return 0;
    124 
    125 baddev:
    126     return ENXIO;
    127 }
    128 
    129 int
    130 devopen(struct open_file *f, const char *fname, char **file)
    131 {
    132     int error;
    133     int dev;
    134     char count, lun, part;
    135     struct devsw *dp;
    136 
    137     dev   = 0;	/* default device is first in table (usually scsi disk) */
    138     count = 0;
    139     lun   = 0;
    140     part  = 0;
    141 
    142     if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
    143 	return error;
    144 
    145     dp = &devsw[dev];
    146 
    147     if ((void *)dp->dv_open == (void *)nodev)
    148 	return ENXIO;
    149 
    150     f->f_dev = dp;
    151 
    152     if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
    153 	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
    154 	       count, lun, part, error, strerror(error));
    155 
    156     return error;
    157 }
    158