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devopen.c revision 1.13 
      1 /*	$NetBSD: devopen.c,v 1.13 1999/11/27 06:46:36 simonb 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 	int ctlr = 0, unit = 0, part = 0;
     54 	int c, rc;
     55 	char namebuf[20];
     56 	const char *cp;
     57 	char *ncp;
     58 #if !defined(LIBSA_SINGLE_DEVICE)
     59 	int i;
     60 	struct devsw *dp;
     61 #endif
     62 
     63 	cp = fname;
     64 	ncp = namebuf;
     65 
     66 	/*
     67 	 * look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd
     68 	 * or 3/tftp/netbsd
     69 	 */
     70 	if ((c = *cp) >= '0' && c <= '9') {
     71 		ctlr = c - '0';
     72 		/* skip the '/' */
     73 		if (*++cp != '/')
     74 			return (ENXIO);
     75 		cp++;
     76 		while ((c = *cp) != '\0') {
     77 			if (c == '/')
     78 				break;
     79 			if (c >= '0' && c <= '9') {
     80 				/* read unit number */
     81 				unit = c - '0';
     82 
     83 				/* look for a partition */
     84 				if ((c = *++cp) >= 'a' && c <= 'h') {
     85 					part = c - 'a';
     86 					c = *++cp;
     87 				}
     88 				if (c != '/')
     89 					return (ENXIO);
     90 				cp++;
     91 				break;
     92 			}
     93 			if (ncp < namebuf + sizeof(namebuf) - 1)
     94 				*ncp++ = c;
     95 			cp++;
     96 		}
     97 	} else {
     98 		/* expect a string like 'rz(0,0,0)netbsd' */
     99 		while ((c = *cp) != '\0') {
    100 			if (c == '(') {
    101 				cp++;
    102 				break;
    103 			}
    104 			if (ncp < namebuf + sizeof(namebuf) - 1)
    105 				*ncp++ = c;
    106 			cp++;
    107 		}
    108 
    109 		/* get controller number */
    110 		if ((c = *cp) >= '0' && c <= '9') {
    111 			ctlr = c - '0';
    112 			c = *++cp;
    113 		}
    114 
    115 		if (c == ',') {
    116 			/* get SCSI device number */
    117 			if ((c = *++cp) >= '0' && c <= '9') {
    118 				unit = c - '0';
    119 				c = *++cp;
    120 			}
    121 
    122 			if (c == ',') {
    123 				/* get partition number */
    124 				if ((c = *++cp) >= '0' && c <= '9') {
    125 					part = c - '0';
    126 					c = *++cp;
    127 				}
    128 			}
    129 		}
    130 		if (c != ')')
    131 			return (ENXIO);
    132 		cp++;
    133 	}
    134 	*ncp = '\0';
    135 
    136 #ifdef LIBSA_SINGLE_DEVICE
    137 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    138 #else /* !LIBSA_SINGLE_DEVICE */
    139 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    140 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    141 			goto fnd;
    142 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    143 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    144 		if (dp->dv_name)
    145 			printf(" %s", dp->dv_name);
    146 	printf("\n");
    147 	return (ENXIO);
    148 
    149 fnd:
    150 #ifdef BOOTNET
    151 	if (strcmp(namebuf, "tftp") == 0)
    152 		rc = (dp->dv_open)(f, namebuf);
    153 	else
    154 #endif /* BOOTNET */
    155 		rc = (dp->dv_open)(f, ctlr, unit, part);
    156 #endif /* !LIBSA_SINGLE_DEVICE */
    157 	if (rc)
    158 		return (rc);
    159 
    160 #ifndef LIBSA_SINGLE_DEVICE
    161 	f->f_dev = dp;
    162 #endif
    163 	if (file && *cp != '\0')
    164 		*file = (char *)cp;	/* XXX */
    165 	return (0);
    166 }
    167