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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 2000/09/26 09:48:35 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 
     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 	/* expect a string like 'dksd(0,0,0)netbsd' */
     67 	while ((c = *cp) != '\0') {
     68 		if (c == '(') {
     69 			cp++;
     70 			break;
     71 		}
     72 		if (ncp < namebuf + sizeof(namebuf) - 1)
     73 			*ncp++ = c;
     74 		cp++;
     75 	}
     76 
     77 	/* get controller number */
     78 	if ((c = *cp) >= '0' && c <= '9') {
     79 		ctlr = c - '0';
     80 		c = *++cp;
     81 	}
     82 
     83 	if (c == ',') {
     84 		/* get SCSI device number */
     85 		if ((c = *++cp) >= '0' && c <= '9') {
     86 			unit = c - '0';
     87 			c = *++cp;
     88 		}
     89 
     90 		if (c == ',') {
     91 			/* get partition number */
     92 			if ((c = *++cp) >= '0' && c <= '9') {
     93 				part = c - '0';
     94 				/* dksd(,,8)boot -> dksd(,,) */
     95 				if (part >= 8)
     96 					part = 0;
     97 				c = *++cp;
     98 			}
     99 		}
    100 	}
    101 	if (c != ')')
    102 		return (ENXIO);
    103 	cp++;
    104 
    105 	*ncp = '\0';
    106 
    107 #ifdef LIBSA_SINGLE_DEVICE
    108 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    109 #else /* !LIBSA_SINGLE_DEVICE */
    110 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    111 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    112 			goto fnd;
    113 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    114 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    115 		if (dp->dv_name)
    116 			printf(" %s", dp->dv_name);
    117 	printf("\n");
    118 	return (ENXIO);
    119 
    120 fnd:
    121 #ifdef BOOTNET
    122 	if (strcmp(namebuf, "tftp") == 0)
    123 		rc = (dp->dv_open)(f, namebuf);
    124 	else
    125 #endif /* BOOTNET */
    126 		rc = (dp->dv_open)(f, ctlr, unit, part);
    127 #endif /* !LIBSA_SINGLE_DEVICE */
    128 	if (rc)
    129 		return (rc);
    130 
    131 #ifndef LIBSA_SINGLE_DEVICE
    132 	f->f_dev = dp;
    133 #endif
    134 	if (file && *cp != '\0')
    135 		*file = (char *)cp;	/* XXX */
    136 	return (0);
    137 }
    138