1/* $NetBSD: devopen.c,v 1.5 2011/04/11 14:00:02 tsutsui Exp $ */ 2 3/* 4 * Copyright (c) 2001 Minoura Makoto 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/param.h> 30#include <sys/disklabel.h> 31#include <lib/libkern/libkern.h> 32#include <lib/libsa/stand.h> 33#include "libx68k.h" 34 35extern struct devspec devspec[]; /* defined in conf.c */ 36int devopen_open_dir = 0; 37 38/* 39 * Parse a device spec. 40 * 41 * sd<unit><part>:<file> 42 * unit - 0-7 43 * part - a-p 44 */ 45int 46devparse(const char *fname, int *dev, int *unit, int *part, char **file) 47{ 48 char const *s; 49 int i; 50 51 s = fname; 52 for (i = 0; devspec[i].ds_name != 0; i++) { 53 if (strncmp (devspec[i].ds_name, s, 54 strlen(devspec[i].ds_name)) == 0) 55 break; 56 } 57 58 if (devspec[i].ds_name == 0) 59 return ENODEV; 60 s += strlen(devspec[i].ds_name); 61 *dev = devspec[i].ds_dev; 62 63 if (devspec[i].ds_net) { 64 *unit = 0; 65 *part = 0; 66 } else { 67 *unit = *s++ - '0'; 68 if (*unit < 0 || *unit > devspec[i].ds_maxunit) 69 /* bad unit */ 70 return ENODEV; 71 *part = *s++ - 'a'; 72 if (*part < 0 || *part > MAXPARTITIONS) 73 /* bad partition */ 74 return ENODEV; 75 } 76 77 if (*s++ != ':') 78 return ENODEV; 79 80 if (*s == '/') { 81 s++; 82 if (devopen_open_dir && *s == 0) 83 s--; 84 } 85 *file = __UNCONST(s); 86 87 return 0; 88} 89 90int 91devopen(struct open_file *f, const char *fname, char **file) 92{ 93 int error; 94 int dev, unit, part; 95 struct devsw *dp = &devsw[0]; 96 97 error = devparse(fname, &dev, &unit, &part, file); 98 if (error) 99 return error; 100 101 dp = &devsw[dev]; 102 103 if (dp->dv_open == NULL) 104 return ENODEV; 105 106 f->f_dev = dp; 107 108 if ((error = (*dp->dv_open)(f, unit, part)) == 0) 109 return 0; 110 111 return error; 112} 113