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devopen.c revision 1.1.2.2 
      1 /* $NetBSD: devopen.c,v 1.1.2.2 2002/11/11 22:03:46 nathanw 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 <lib/libsa/stand.h>
     42 
     43 /*
     44  * Decode the string 'fname', open the device and return the remaining
     45  * file name if any.
     46  */
     47 int
     48 devopen(f, fname, file)
     49 	struct open_file *f;
     50 	const char *fname;
     51 	char **file;	/* out */
     52 {
     53 	register char *cp;
     54 	register char *ncp;
     55 	register struct devsw *dp;
     56 #if 0
     57 	register int c, i;
     58 #endif
     59 	int ctlr = 0, unit = 0, part = 0;
     60 	char namebuf[20];
     61 	int rc;
     62 
     63 	cp = (char *)fname;
     64 	ncp = namebuf;
     65 
     66 #if 0
     67 	/* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
     68 	if ((c = *cp) >= '0' && c <= '9') {
     69 		ctlr = c - '0';
     70 		/* skip the '/' */
     71 		if (*++cp != '/')
     72 			return (ENXIO);
     73 		cp++;
     74 		while ((c = *cp) != '\0') {
     75 			if (c == '/')
     76 				break;
     77 			if (c >= '0' && c <= '9') {
     78 				/* read unit number */
     79 				unit = c - '0';
     80 
     81 				/* look for a partition */
     82 				if ((c = *++cp) >= 'a' && c <= 'h') {
     83 					part = c - 'a';
     84 					c = *++cp;
     85 				}
     86 				if (c != '/')
     87 					return (ENXIO);
     88 				break;
     89 			}
     90 			if (ncp < namebuf + sizeof(namebuf) - 1)
     91 				*ncp++ = c;
     92 			cp++;
     93 		}
     94 		*ncp = '\0';
     95 	/*
     96 	 * XXX
     97 	 * pulling strchr from the C library, should pull from libkern.
     98 	 */
     99 	} else if (strchr(cp, '(')) {
    100 		/* expect a string like 'rz(0,0,0)vmunix' */
    101 		while ((c = *cp) != '\0') {
    102 			if (c == '(') {
    103 				cp++;
    104 				break;
    105 			}
    106 			if (ncp < namebuf + sizeof(namebuf) - 1)
    107 				*ncp++ = c;
    108 			cp++;
    109 		}
    110 
    111 		/* get controller number */
    112 		if ((c = *cp) >= '0' && c <= '9') {
    113 			ctlr = c - '0';
    114 			c = *++cp;
    115 		}
    116 
    117 		if (c == ',') {
    118 			/* get SCSI device number */
    119 			if ((c = *++cp) >= '0' && c <= '9') {
    120 				unit = c - '0';
    121 				c = *++cp;
    122 			}
    123 
    124 			if (c == ',') {
    125 				/* get partition number */
    126 				if ((c = *++cp) >= '0' && c <= '9') {
    127 					part = c - '0';
    128 					c = *++cp;
    129 				}
    130 			}
    131 		}
    132 		if (c != ')')
    133 			return (ENXIO);
    134 		cp++;
    135 		*ncp = '\0';
    136 	} else {
    137 #endif
    138 		dp = devsw;
    139 		ctlr = unit = part = 0;
    140 		goto fnd;
    141 #if 0
    142 	}
    143 
    144 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    145 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    146 			goto fnd;
    147 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    148 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    149 		if (dp->dv_name)
    150 			printf(" %s", dp->dv_name);
    151 	printf("\n");
    152 	return (ENXIO);
    153 #endif
    154 
    155 fnd:
    156 	rc = (dp->dv_open)(f, ctlr, unit, part);
    157 	if (rc)
    158 		return (rc);
    159 
    160 	f->f_dev = dp;
    161 	if (file && *cp != '\0')
    162 		*file = cp;
    163 	return (0);
    164 }
    165