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devopen.c revision 1.3 
      1 /* $NetBSD: devopen.c,v 1.3 2005/12/11 12:18:51 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)devopen.c	8.1 (Berkeley) 6/10/93
     35  */
     36 
     37 #include <lib/libsa/stand.h>
     38 
     39 /*
     40  * Decode the string 'fname', open the device and return the remaining
     41  * file name if any.
     42  */
     43 int
     44 devopen(f, fname, file)
     45 	struct open_file *f;
     46 	const char *fname;
     47 	char **file;	/* out */
     48 {
     49 	register char *cp;
     50 	register char *ncp;
     51 	register struct devsw *dp;
     52 #if 0
     53 	register int c, i;
     54 #endif
     55 	int ctlr = 0, unit = 0, part = 0;
     56 	char namebuf[20];
     57 	int rc;
     58 
     59 	cp = (char *)fname;
     60 	ncp = namebuf;
     61 
     62 #if 0
     63 	/* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
     64 	if ((c = *cp) >= '0' && c <= '9') {
     65 		ctlr = c - '0';
     66 		/* skip the '/' */
     67 		if (*++cp != '/')
     68 			return (ENXIO);
     69 		cp++;
     70 		while ((c = *cp) != '\0') {
     71 			if (c == '/')
     72 				break;
     73 			if (c >= '0' && c <= '9') {
     74 				/* read unit number */
     75 				unit = c - '0';
     76 
     77 				/* look for a partition */
     78 				if ((c = *++cp) >= 'a' && c <= 'h') {
     79 					part = c - 'a';
     80 					c = *++cp;
     81 				}
     82 				if (c != '/')
     83 					return (ENXIO);
     84 				break;
     85 			}
     86 			if (ncp < namebuf + sizeof(namebuf) - 1)
     87 				*ncp++ = c;
     88 			cp++;
     89 		}
     90 		*ncp = '\0';
     91 	/*
     92 	 * XXX
     93 	 * pulling strchr from the C library, should pull from libkern.
     94 	 */
     95 	} else if (strchr(cp, '(')) {
     96 		/* expect a string like 'rz(0,0,0)vmunix' */
     97 		while ((c = *cp) != '\0') {
     98 			if (c == '(') {
     99 				cp++;
    100 				break;
    101 			}
    102 			if (ncp < namebuf + sizeof(namebuf) - 1)
    103 				*ncp++ = c;
    104 			cp++;
    105 		}
    106 
    107 		/* get controller number */
    108 		if ((c = *cp) >= '0' && c <= '9') {
    109 			ctlr = c - '0';
    110 			c = *++cp;
    111 		}
    112 
    113 		if (c == ',') {
    114 			/* get SCSI device number */
    115 			if ((c = *++cp) >= '0' && c <= '9') {
    116 				unit = c - '0';
    117 				c = *++cp;
    118 			}
    119 
    120 			if (c == ',') {
    121 				/* get partition number */
    122 				if ((c = *++cp) >= '0' && c <= '9') {
    123 					part = c - '0';
    124 					c = *++cp;
    125 				}
    126 			}
    127 		}
    128 		if (c != ')')
    129 			return (ENXIO);
    130 		cp++;
    131 		*ncp = '\0';
    132 	} else {
    133 #endif
    134 		dp = devsw;
    135 		ctlr = unit = part = 0;
    136 		goto fnd;
    137 #if 0
    138 	}
    139 
    140 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    141 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    142 			goto fnd;
    143 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    144 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    145 		if (dp->dv_name)
    146 			printf(" %s", dp->dv_name);
    147 	printf("\n");
    148 	return (ENXIO);
    149 #endif
    150 
    151 fnd:
    152 	rc = (dp->dv_open)(f, ctlr, unit, part);
    153 	if (rc)
    154 		return (rc);
    155 
    156 	f->f_dev = dp;
    157 	if (file && *cp != '\0')
    158 		*file = cp;
    159 	return (0);
    160 }
    161