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devopen.c revision 1.1 
      1 /*	$NetBSD: devopen.c,v 1.1 1996/09/18 20:03:09 cgd 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)devopen.c	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #include <stand.h>
     42 
     43 /*
     44  * Decode the string 'fname', open the device and return the remaining
     45  * file name if any.
     46  */
     47 devopen(f, fname, file)
     48 	struct open_file *f;
     49 	const char *fname;
     50 	char **file;	/* out */
     51 {
     52 	register char *cp;
     53 	register char *ncp;
     54 	register struct devsw *dp;
     55 	register int c, i;
     56 	int ctlr = 0, unit = 0, part = 0;
     57 	char namebuf[20];
     58 	int rc;
     59 
     60 	cp = (char *)fname;
     61 	ncp = namebuf;
     62 
     63 #if 0
     64 	/* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
     65 	if ((c = *cp) >= '0' && c <= '9') {
     66 		ctlr = c - '0';
     67 		/* skip the '/' */
     68 		if (*++cp != '/')
     69 			return (ENXIO);
     70 		cp++;
     71 		while ((c = *cp) != '\0') {
     72 			if (c == '/')
     73 				break;
     74 			if (c >= '0' && c <= '9') {
     75 				/* read unit number */
     76 				unit = c - '0';
     77 
     78 				/* look for a partition */
     79 				if ((c = *++cp) >= 'a' && c <= 'h') {
     80 					part = c - 'a';
     81 					c = *++cp;
     82 				}
     83 				if (c != '/')
     84 					return (ENXIO);
     85 				break;
     86 			}
     87 			if (ncp < namebuf + sizeof(namebuf) - 1)
     88 				*ncp++ = c;
     89 			cp++;
     90 		}
     91 		*ncp = '\0';
     92 	/*
     93 	 * XXX
     94 	 * pulling strchr from the C library, should pull from libkern.
     95 	 */
     96 	} else if (strchr(cp, '(')) {
     97 		/* expect a string like 'rz(0,0,0)vmunix' */
     98 		while ((c = *cp) != '\0') {
     99 			if (c == '(') {
    100 				cp++;
    101 				break;
    102 			}
    103 			if (ncp < namebuf + sizeof(namebuf) - 1)
    104 				*ncp++ = c;
    105 			cp++;
    106 		}
    107 
    108 		/* get controller number */
    109 		if ((c = *cp) >= '0' && c <= '9') {
    110 			ctlr = c - '0';
    111 			c = *++cp;
    112 		}
    113 
    114 		if (c == ',') {
    115 			/* get SCSI device number */
    116 			if ((c = *++cp) >= '0' && c <= '9') {
    117 				unit = c - '0';
    118 				c = *++cp;
    119 			}
    120 
    121 			if (c == ',') {
    122 				/* get partition number */
    123 				if ((c = *++cp) >= '0' && c <= '9') {
    124 					part = c - '0';
    125 					c = *++cp;
    126 				}
    127 			}
    128 		}
    129 		if (c != ')')
    130 			return (ENXIO);
    131 		cp++;
    132 		*ncp = '\0';
    133 	} else {
    134 #endif
    135 		dp = devsw;
    136 		ctlr = unit = part = 0;
    137 		goto fnd;
    138 #if 0
    139 	}
    140 
    141 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    142 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    143 			goto fnd;
    144 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    145 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    146 		if (dp->dv_name)
    147 			printf(" %s", dp->dv_name);
    148 	printf("\n");
    149 	return (ENXIO);
    150 #endif
    151 
    152 fnd:
    153 	rc = (dp->dv_open)(f, ctlr, unit, part);
    154 	if (rc)
    155 		return (rc);
    156 
    157 	f->f_dev = dp;
    158 	if (file && *cp != '\0')
    159 		*file = cp;
    160 	return (0);
    161 }
    162