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devopen.c revision 1.15 
      1 /*	$NetBSD: devopen.c,v 1.15 2003/08/07 16:29:15 agc 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 #include <lib/libkern/libkern.h>
     39 
     40 /*
     41  * Decode the string 'fname', open the device and return the remaining
     42  * file name if any.
     43  */
     44 int
     45 devopen(f, fname, file)
     46 	struct open_file *f;
     47 	const char *fname;
     48 	char **file;	/* out */
     49 {
     50 	int ctlr = 0, unit = 0, part = 0;
     51 	int c, rc;
     52 	char namebuf[20];
     53 	const char *cp;
     54 	char *ncp;
     55 #if !defined(LIBSA_SINGLE_DEVICE)
     56 	int i;
     57 	struct devsw *dp;
     58 #endif
     59 
     60 	cp = fname;
     61 	ncp = namebuf;
     62 
     63 	/*
     64 	 * look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd
     65 	 * or 3/tftp/netbsd
     66 	 */
     67 	if ((c = *cp) >= '0' && c <= '9') {
     68 		ctlr = c - '0';
     69 		/* skip the '/' */
     70 		if (*++cp != '/')
     71 			return (ENXIO);
     72 		cp++;
     73 		while ((c = *cp) != '\0') {
     74 			if (c == '/')
     75 				break;
     76 			if (c >= '0' && c <= '9') {
     77 				/* read unit number */
     78 				unit = c - '0';
     79 
     80 				/* look for a partition */
     81 				if ((c = *++cp) >= 'a' && c <= 'h') {
     82 					part = c - 'a';
     83 					c = *++cp;
     84 				}
     85 				if (c != '/')
     86 					return (ENXIO);
     87 				cp++;
     88 				break;
     89 			}
     90 			if (ncp < namebuf + sizeof(namebuf) - 1)
     91 				*ncp++ = c;
     92 			cp++;
     93 		}
     94 	} else {
     95 		/* expect a string like 'rz(0,0,0)netbsd' */
     96 		while ((c = *cp) != '\0') {
     97 			if (c == '(') {
     98 				cp++;
     99 				break;
    100 			}
    101 			if (ncp < namebuf + sizeof(namebuf) - 1)
    102 				*ncp++ = c;
    103 			cp++;
    104 		}
    105 
    106 		/* get controller number */
    107 		if ((c = *cp) >= '0' && c <= '9') {
    108 			ctlr = c - '0';
    109 			c = *++cp;
    110 		}
    111 
    112 		if (c == ',') {
    113 			/* get SCSI device number */
    114 			if ((c = *++cp) >= '0' && c <= '9') {
    115 				unit = c - '0';
    116 				c = *++cp;
    117 			}
    118 
    119 			if (c == ',') {
    120 				/* get partition number */
    121 				if ((c = *++cp) >= '0' && c <= '9') {
    122 					part = c - '0';
    123 					c = *++cp;
    124 				}
    125 			}
    126 		}
    127 		if (c != ')')
    128 			return (ENXIO);
    129 		cp++;
    130 	}
    131 	*ncp = '\0';
    132 
    133 #ifdef LIBSA_SINGLE_DEVICE
    134 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    135 #else /* !LIBSA_SINGLE_DEVICE */
    136 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    137 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    138 			goto fnd;
    139 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    140 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    141 		if (dp->dv_name)
    142 			printf(" %s", dp->dv_name);
    143 	printf("\n");
    144 	return (ENXIO);
    145 
    146 fnd:
    147 #ifdef BOOTNET
    148 	if (strcmp(namebuf, "tftp") == 0)
    149 		rc = (dp->dv_open)(f, namebuf);
    150 	else
    151 #endif /* BOOTNET */
    152 		rc = (dp->dv_open)(f, ctlr, unit, part);
    153 #endif /* !LIBSA_SINGLE_DEVICE */
    154 	if (rc)
    155 		return (rc);
    156 
    157 #ifndef LIBSA_SINGLE_DEVICE
    158 	f->f_dev = dp;
    159 #endif
    160 	if (file && *cp != '\0')
    161 		*file = (char *)cp;	/* XXX */
    162 	return (0);
    163 }
    164