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devopen.c revision 1.1 
      1 /*	$NetBSD: devopen.c,v 1.1 1998/06/09 07:53:06 dbj 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
     36 atoi(const char *cp)
     37 {
     38     int val = 0;
     39 
     40     while(isdigit(*cp))
     41 	val = val * 10 + (*cp++ - '0');
     42     return val;
     43 }
     44 
     45 int
     46 devlookup(const char *d, int len)
     47 {
     48     struct devsw *dp = devsw;
     49     int i;
     50 
     51     for (i = 0; i < ndevs; i++, dp++)
     52 	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
     53 	    return i;
     54 
     55     for (i = 0; i < len; i++)
     56 	printf("%c", d[i]);
     57     printf(": no such device - Configured devices are:\n");
     58     for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     59 	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
     60 	    printf(" %s", dp->dv_name);
     61     printf("\n");
     62     errno = ENXIO;
     63     return -1;
     64 }
     65 
     66 /*
     67  * Parse a device spec.
     68  *
     69  * Format:
     70  *   dev(count, lun, part)file
     71  */
     72 int
     73 devparse(const char *fname, int *dev,
     74 	 char *count, char *lun, char *part, char **file)
     75 {
     76     int i;
     77     const char *s, *args[3];
     78 
     79     /* get device name */
     80     for (s = fname; *s && *s != '/' && *s != '('; s++)
     81 	;
     82 
     83     if (*s == '(') {
     84 	/* lookup device and get index */
     85 	if ((*dev = devlookup(fname, s - fname)) < 0)
     86 	    goto baddev;
     87 
     88 	/* tokenize device ident */
     89 	args[0] = ++s;
     90 	for (i = 1; *s && *s != ')' && i<3; s++) {
     91 	    if (*s == ',')
     92 		args[i++] = ++s;
     93 	}
     94 	if (*s != ')')
     95 	    goto baddev;
     96 
     97 	switch(i) {
     98 	  case 3:
     99 	      *count  = atoi(args[0]);
    100 	      *lun  = atoi(args[1]);
    101 	      *part  = atoi(args[2]);
    102 	      break;
    103 	  case 2:
    104 	      *lun  = atoi(args[0]);
    105 	      *part  = atoi(args[1]);
    106 	      break;
    107 	  case 1:
    108 	      *part  = atoi(args[0]);
    109 	      break;
    110 	  case 0:
    111 	      break;
    112 	}
    113 	*file = (char *)++s;	/* XXX discard const */
    114     }
    115     /* no device present */
    116     else
    117 	*file = (char *)fname;	/* XXX discard const */
    118 
    119     return 0;
    120 
    121 baddev:
    122     return ENXIO;
    123 }
    124 
    125 int
    126 devopen(struct open_file *f, const char *fname, char **file)
    127 {
    128     int error;
    129     int dev;
    130     char count, lun, part;
    131     struct devsw *dp;
    132 
    133     dev   = 0;	/* default device is first in table (usually scsi disk) */
    134     count = 0;
    135     lun   = 0;
    136     part  = 0;
    137 
    138     if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
    139 	return error;
    140 
    141     dp = &devsw[dev];
    142 
    143     if ((void *)dp->dv_open == (void *)nodev)
    144 	return ENXIO;
    145 
    146     f->f_dev = dp;
    147 
    148     if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
    149 	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
    150 	       count, lun, part, error, strerror(error));
    151 
    152     return error;
    153 }
    154