1 /* $NetBSD: devopen.c,v 1.4 2007/11/11 05:20:27 isaki 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 35 extern struct devspec devspec[]; /* defined in conf.c */ 36 int 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 */ 45 int 46 devparse(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 *unit = *s++ - '0'; 64 if (*unit < 0 || *unit > devspec[i].ds_maxunit) 65 /* bad unit */ 66 return ENODEV; 67 *part = *s++ - 'a'; 68 if (*part < 0 || *part > MAXPARTITIONS) 69 /* bad partition */ 70 return ENODEV; 71 72 if (*s++ != ':') 73 return ENODEV; 74 75 if (*s == '/') { 76 s++; 77 if (devopen_open_dir && *s == 0) 78 s--; 79 } 80 *file = __UNCONST(s); 81 82 return 0; 83 } 84 85 int 86 devopen(struct open_file *f, const char *fname, char **file) 87 { 88 int error; 89 int dev, unit, part; 90 struct devsw *dp = &devsw[0]; 91 92 error = devparse(fname, &dev, &unit, &part, file); 93 if (error) 94 return error; 95 96 dp = &devsw[dev]; 97 98 if (!dp->dv_open) 99 return ENODEV; 100 101 f->f_dev = dp; 102 103 if ((error = (*dp->dv_open)(f, unit, part)) == 0) 104 return 0; 105 106 return error; 107 } 108