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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 1999/03/26 06:54:40 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 atoi __P((const char *cp));
     36 int devlookup __P((const char *d, int len));
     37 int devparse __P((const char *fname, int *dev,
     38 	 char *count, char *lun, char *part, char **file));
     39 
     40 int
     41 atoi(const char *cp)
     42 {
     43     int val = 0;
     44 
     45     while(isdigit(*cp))
     46 	val = val * 10 + (*cp++ - '0');
     47     return val;
     48 }
     49 
     50 int
     51 devlookup(const char *d, int len)
     52 {
     53     struct devsw *dp = devsw;
     54     int i;
     55 
     56     for (i = 0; i < ndevs; i++, dp++)
     57 	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
     58 	    return i;
     59 
     60     for (i = 0; i < len; i++)
     61 	printf("%c", d[i]);
     62     printf(": no such device - Configured devices are:\n");
     63     for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     64 	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
     65 	    printf(" %s", dp->dv_name);
     66     printf("\n");
     67     errno = ENXIO;
     68     return -1;
     69 }
     70 
     71 /*
     72  * Parse a device spec.
     73  *
     74  * Format:
     75  *   dev(count, lun, part)file
     76  */
     77 int
     78 devparse(const char *fname, int *dev,
     79 	 char *count, char *lun, char *part, char **file)
     80 {
     81     int i;
     82     const char *s, *args[3];
     83 
     84     /* get device name */
     85     for (s = fname; *s && *s != '/' && *s != '('; s++)
     86 	;
     87 
     88     if (*s == '(') {
     89 	/* lookup device and get index */
     90 	if ((*dev = devlookup(fname, s - fname)) < 0)
     91 	    goto baddev;
     92 
     93 	/* tokenize device ident */
     94 	args[0] = ++s;
     95 	for (i = 1; *s && *s != ')' && i<3; s++) {
     96 	    if (*s == ',')
     97 		args[i++] = ++s;
     98 	}
     99 	if (*s != ')')
    100 	    goto baddev;
    101 
    102 	switch(i) {
    103 	  case 3:
    104 	      *count  = atoi(args[0]);
    105 	      *lun  = atoi(args[1]);
    106 	      *part  = atoi(args[2]);
    107 	      break;
    108 	  case 2:
    109 	      *lun  = atoi(args[0]);
    110 	      *part  = atoi(args[1]);
    111 	      break;
    112 	  case 1:
    113 	      *part  = atoi(args[0]);
    114 	      break;
    115 	  case 0:
    116 	      break;
    117 	}
    118 	*file = (char *)++s;	/* XXX discard const */
    119     }
    120     /* no device present */
    121     else
    122 	*file = (char *)fname;	/* XXX discard const */
    123 
    124     return 0;
    125 
    126 baddev:
    127     return ENXIO;
    128 }
    129 
    130 int
    131 devopen(struct open_file *f, const char *fname, char **file)
    132 {
    133     int error;
    134     int dev;
    135     char count, lun, part;
    136     struct devsw *dp;
    137 
    138     dev   = 0;	/* default device is first in table (usually scsi disk) */
    139     count = 0;
    140     lun   = 0;
    141     part  = 0;
    142 
    143     if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
    144 	return error;
    145 
    146     dp = &devsw[dev];
    147 
    148     if ((void *)dp->dv_open == (void *)nodev)
    149 	return ENXIO;
    150 
    151     f->f_dev = dp;
    152 
    153     if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
    154 	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
    155 	       count, lun, part, error, strerror(error));
    156 
    157     return error;
    158 }
    159