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      1 /*	$NetBSD: devopen.c,v 1.2 2018/03/06 22:13:14 christos 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,
     46         const char *fname,
     47         char **file)	/* out */
     48 {
     49 	int ctlr = 0, unit = 0, part = 0;
     50 	int c, rc;
     51 	char device_name[20];
     52 	const char *cp;
     53 	char *ncp;
     54 #if !defined(LIBSA_SINGLE_DEVICE)
     55 	int i;
     56 	struct devsw *dp;
     57 #endif
     58 
     59 	cp = fname;
     60 	ncp = device_name;
     61 
     62 	/*
     63 	 * Require the form CTRL/DEVNAME(UNIT,PART)/FILENAME
     64 	 * e.g. '0/ace(0,0)/netbsd' '0/tftp(0,0)/netbsd'
     65 	 */
     66 
     67 	/* get controller number */
     68 	c = *cp++;
     69 	if (c < '0' || c > '9')
     70 		return ENXIO;
     71 	ctlr = c - '0';
     72 
     73 	c = *cp++;
     74 	if (c != '/')
     75 		return ENXIO;
     76 
     77 	/* get device name */
     78 	while ((c = *cp) != '\0') {
     79 		if ((c == '(') || (c == '/')) {
     80 			cp++;
     81 			break;
     82 		}
     83 		if (ncp < device_name + sizeof(device_name) - 1)
     84 			*ncp++ = c;
     85 		cp++;
     86 	}
     87 	if (ncp == device_name)
     88 		return ENXIO;
     89 
     90 	/* get device number */
     91 	c = *cp++;
     92 	if (c < '0' || c > '9')
     93 		return ENXIO;
     94 	unit = c - '0';
     95 
     96 	c = *cp++;
     97 	if (c != ',')
     98 		return (ENXIO);
     99 
    100 	/* get partition number */
    101 	c = *cp++;
    102 	if (c < '0' || c > '9')
    103 		return ENXIO;
    104 	part = c - '0';
    105 
    106 	c = *cp++;
    107 	if (c != ')')
    108 		return ENXIO;
    109 
    110 	*ncp = '\0';
    111 
    112 #ifdef LIBSA_SINGLE_DEVICE
    113 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    114 #else /* !LIBSA_SINGLE_DEVICE */
    115 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    116 		if (dp->dv_name && strcmp(device_name, dp->dv_name) == 0)
    117 			goto fnd;
    118 	printf("Unknown device '%s'\nKnown devices are:", device_name);
    119 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    120 		if (dp->dv_name)
    121 			printf(" %s", dp->dv_name);
    122 	printf("\n");
    123 	return ENXIO;
    124 
    125 fnd:
    126 #ifdef BOOTNET
    127 	if (strcmp(device_name, "tftp") == 0)
    128 		rc = (dp->dv_open)(f, device_name);
    129 	else
    130 #endif /* BOOTNET */
    131 		rc = (dp->dv_open)(f, ctlr, unit, part, cp);
    132 #endif /* !LIBSA_SINGLE_DEVICE */
    133 	if (rc)
    134 		return rc;
    135 
    136 #ifndef LIBSA_SINGLE_DEVICE
    137 	f->f_dev = dp;
    138 #endif
    139 	if (file && *cp != '\0')
    140 		*file = (char *)cp;	/* XXX */
    141 	return 0;
    142 }
    143