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devopen.c revision 1.3 
      1 /*	$NetBSD: devopen.c,v 1.3 2002/11/16 08:51:27 wdk 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 	/* expect a string like 'dksd(0,0,0)netbsd' */
     68 	while ((c = *cp) != '\0') {
     69 		if (c == '(') {
     70 			cp++;
     71 			break;
     72 		}
     73 		if (ncp < namebuf + sizeof(namebuf) - 1)
     74 			*ncp++ = c;
     75 		cp++;
     76 	}
     77 
     78 	/* get controller number */
     79 	if ((c = *cp) >= '0' && c <= '9') {
     80 		ctlr = c - '0';
     81 		c = *++cp;
     82 	}
     83 
     84 	if (c == ',') {
     85 		/* get SCSI device number */
     86 		if ((c = *++cp) >= '0' && c <= '9') {
     87 			unit = c - '0';
     88 			c = *++cp;
     89 		}
     90 
     91 		if (c == ',') {
     92 			/* get partition number */
     93 			if ((c = *++cp) >= '0' && c <= '9') {
     94 				part = c - '0';
     95 				/* dksd(,,8)boot -> dksd(,,) */
     96 				if (part >= 8)
     97 					part = 0;
     98 				c = *++cp;
     99 			}
    100 		}
    101 	}
    102 	if (c != ')')
    103 		return (ENXIO);
    104 	cp++;
    105 
    106 	*ncp = '\0';
    107 
    108 #ifdef LIBSA_SINGLE_DEVICE
    109 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    110 #else /* !LIBSA_SINGLE_DEVICE */
    111 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    112 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    113 			goto fnd;
    114 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    115 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    116 		if (dp->dv_name)
    117 			printf(" %s", dp->dv_name);
    118 	printf("\n");
    119 	return (ENXIO);
    120 
    121 fnd:
    122 #ifdef BOOTNET
    123 	if (strcmp(namebuf, "tftp") == 0)
    124 		rc = (dp->dv_open)(f, namebuf);
    125 	else
    126 #endif /* BOOTNET */
    127 		rc = (dp->dv_open)(f, ctlr, unit, part);
    128 #endif /* !LIBSA_SINGLE_DEVICE */
    129 	if (rc)
    130 		return (rc);
    131 
    132 #ifndef LIBSA_SINGLE_DEVICE
    133 	f->f_dev = dp;
    134 #endif
    135 	if (file && *cp != '\0')
    136 		*file = (char *)cp;	/* XXX */
    137 	return (0);
    138 }
    139