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      1 /*	$NetBSD: devopen.c,v 1.6 2009/03/14 21:04:12 dsl 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(struct open_file *f, const char *fname, char **file)
     46 	/* file:	 out */
     47 {
     48 	int ctlr = 0, unit = 0, part = 0;
     49 	int c, rc;
     50 	char namebuf[20];
     51 	const char *cp;
     52 	char *ncp;
     53 #if !defined(LIBSA_SINGLE_DEVICE)
     54 	int i;
     55 	struct devsw *dp;
     56 #endif
     57 
     58 	cp = fname;
     59 	ncp = namebuf;
     60 
     61 	/* expect a string like 'dksd(0,0,0)netbsd' */
     62 	while ((c = *cp) != '\0') {
     63 		if (c == '(') {
     64 			cp++;
     65 			break;
     66 		}
     67 		if (ncp < namebuf + sizeof(namebuf) - 1)
     68 			*ncp++ = c;
     69 		cp++;
     70 	}
     71 
     72 	/* get controller number */
     73 	if ((c = *cp) >= '0' && c <= '9') {
     74 		ctlr = c - '0';
     75 		c = *++cp;
     76 	}
     77 
     78 	if (c == ',') {
     79 		/* get SCSI device number */
     80 		if ((c = *++cp) >= '0' && c <= '9') {
     81 			unit = c - '0';
     82 			c = *++cp;
     83 		}
     84 
     85 		if (c == ',') {
     86 			/* get partition number */
     87 			if ((c = *++cp) >= '0' && c <= '9') {
     88 				part = c - '0';
     89 				/* dksd(,,8)boot -> dksd(,,) */
     90 				if (part >= 8)
     91 					part = 0;
     92 				c = *++cp;
     93 			}
     94 		}
     95 	}
     96 	if (c != ')')
     97 		return (ENXIO);
     98 	cp++;
     99 
    100 	*ncp = '\0';
    101 
    102 #ifdef LIBSA_SINGLE_DEVICE
    103 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    104 #else /* !LIBSA_SINGLE_DEVICE */
    105 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    106 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    107 			goto fnd;
    108 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    109 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    110 		if (dp->dv_name)
    111 			printf(" %s", dp->dv_name);
    112 	printf("\n");
    113 	return (ENXIO);
    114 
    115 fnd:
    116 #ifdef BOOTNET
    117 	if (strcmp(namebuf, "tftp") == 0)
    118 		rc = (dp->dv_open)(f, namebuf);
    119 	else
    120 #endif /* BOOTNET */
    121 		rc = (dp->dv_open)(f, ctlr, unit, part);
    122 #endif /* !LIBSA_SINGLE_DEVICE */
    123 	if (rc)
    124 		return (rc);
    125 
    126 #ifndef LIBSA_SINGLE_DEVICE
    127 	f->f_dev = dp;
    128 #endif
    129 	if (file && *cp != '\0')
    130 		*file = (char *)cp;	/* XXX */
    131 	return (0);
    132 }
    133