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devopen.c revision 1.14 
      1 /*	$NetBSD: devopen.c,v 1.14 2002/12/09 12:14:10 jdolecek 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 #include <lib/libkern/libkern.h>
     43 
     44 /*
     45  * Decode the string 'fname', open the device and return the remaining
     46  * file name if any.
     47  */
     48 int
     49 devopen(f, fname, file)
     50 	struct open_file *f;
     51 	const char *fname;
     52 	char **file;	/* out */
     53 {
     54 	int ctlr = 0, unit = 0, part = 0;
     55 	int c, rc;
     56 	char namebuf[20];
     57 	const char *cp;
     58 	char *ncp;
     59 #if !defined(LIBSA_SINGLE_DEVICE)
     60 	int i;
     61 	struct devsw *dp;
     62 #endif
     63 
     64 	cp = fname;
     65 	ncp = namebuf;
     66 
     67 	/*
     68 	 * look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd
     69 	 * or 3/tftp/netbsd
     70 	 */
     71 	if ((c = *cp) >= '0' && c <= '9') {
     72 		ctlr = c - '0';
     73 		/* skip the '/' */
     74 		if (*++cp != '/')
     75 			return (ENXIO);
     76 		cp++;
     77 		while ((c = *cp) != '\0') {
     78 			if (c == '/')
     79 				break;
     80 			if (c >= '0' && c <= '9') {
     81 				/* read unit number */
     82 				unit = c - '0';
     83 
     84 				/* look for a partition */
     85 				if ((c = *++cp) >= 'a' && c <= 'h') {
     86 					part = c - 'a';
     87 					c = *++cp;
     88 				}
     89 				if (c != '/')
     90 					return (ENXIO);
     91 				cp++;
     92 				break;
     93 			}
     94 			if (ncp < namebuf + sizeof(namebuf) - 1)
     95 				*ncp++ = c;
     96 			cp++;
     97 		}
     98 	} else {
     99 		/* expect a string like 'rz(0,0,0)netbsd' */
    100 		while ((c = *cp) != '\0') {
    101 			if (c == '(') {
    102 				cp++;
    103 				break;
    104 			}
    105 			if (ncp < namebuf + sizeof(namebuf) - 1)
    106 				*ncp++ = c;
    107 			cp++;
    108 		}
    109 
    110 		/* get controller number */
    111 		if ((c = *cp) >= '0' && c <= '9') {
    112 			ctlr = c - '0';
    113 			c = *++cp;
    114 		}
    115 
    116 		if (c == ',') {
    117 			/* get SCSI device number */
    118 			if ((c = *++cp) >= '0' && c <= '9') {
    119 				unit = c - '0';
    120 				c = *++cp;
    121 			}
    122 
    123 			if (c == ',') {
    124 				/* get partition number */
    125 				if ((c = *++cp) >= '0' && c <= '9') {
    126 					part = c - '0';
    127 					c = *++cp;
    128 				}
    129 			}
    130 		}
    131 		if (c != ')')
    132 			return (ENXIO);
    133 		cp++;
    134 	}
    135 	*ncp = '\0';
    136 
    137 #ifdef LIBSA_SINGLE_DEVICE
    138 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    139 #else /* !LIBSA_SINGLE_DEVICE */
    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 
    150 fnd:
    151 #ifdef BOOTNET
    152 	if (strcmp(namebuf, "tftp") == 0)
    153 		rc = (dp->dv_open)(f, namebuf);
    154 	else
    155 #endif /* BOOTNET */
    156 		rc = (dp->dv_open)(f, ctlr, unit, part);
    157 #endif /* !LIBSA_SINGLE_DEVICE */
    158 	if (rc)
    159 		return (rc);
    160 
    161 #ifndef LIBSA_SINGLE_DEVICE
    162 	f->f_dev = dp;
    163 #endif
    164 	if (file && *cp != '\0')
    165 		*file = (char *)cp;	/* XXX */
    166 	return (0);
    167 }
    168