1 /* $NetBSD: devopen.c,v 1.2 1999/03/26 06:54:40 dbj Exp $ */ 2 /* 3 * Copyright (c) 1994 Rolf Grossmann 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Rolf Grossmann. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <lib/libsa/stand.h> 33 #include <lib/libkern/libkern.h> 34 35 int atoi __P((const char *cp)); 36 int devlookup __P((const char *d, int len)); 37 int devparse __P((const char *fname, int *dev, 38 char *count, char *lun, char *part, char **file)); 39 40 int 41 atoi(const char *cp) 42 { 43 int val = 0; 44 45 while(isdigit(*cp)) 46 val = val * 10 + (*cp++ - '0'); 47 return val; 48 } 49 50 int 51 devlookup(const char *d, int len) 52 { 53 struct devsw *dp = devsw; 54 int i; 55 56 for (i = 0; i < ndevs; i++, dp++) 57 if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0) 58 return i; 59 60 for (i = 0; i < len; i++) 61 printf("%c", d[i]); 62 printf(": no such device - Configured devices are:\n"); 63 for (dp = devsw, i = 0; i < ndevs; i++, dp++) 64 if (dp->dv_name && (void *)dp->dv_open != (void *)nodev) 65 printf(" %s", dp->dv_name); 66 printf("\n"); 67 errno = ENXIO; 68 return -1; 69 } 70 71 /* 72 * Parse a device spec. 73 * 74 * Format: 75 * dev(count, lun, part)file 76 */ 77 int 78 devparse(const char *fname, int *dev, 79 char *count, char *lun, char *part, char **file) 80 { 81 int i; 82 const char *s, *args[3]; 83 84 /* get device name */ 85 for (s = fname; *s && *s != '/' && *s != '('; s++) 86 ; 87 88 if (*s == '(') { 89 /* lookup device and get index */ 90 if ((*dev = devlookup(fname, s - fname)) < 0) 91 goto baddev; 92 93 /* tokenize device ident */ 94 args[0] = ++s; 95 for (i = 1; *s && *s != ')' && i<3; s++) { 96 if (*s == ',') 97 args[i++] = ++s; 98 } 99 if (*s != ')') 100 goto baddev; 101 102 switch(i) { 103 case 3: 104 *count = atoi(args[0]); 105 *lun = atoi(args[1]); 106 *part = atoi(args[2]); 107 break; 108 case 2: 109 *lun = atoi(args[0]); 110 *part = atoi(args[1]); 111 break; 112 case 1: 113 *part = atoi(args[0]); 114 break; 115 case 0: 116 break; 117 } 118 *file = (char *)++s; /* XXX discard const */ 119 } 120 /* no device present */ 121 else 122 *file = (char *)fname; /* XXX discard const */ 123 124 return 0; 125 126 baddev: 127 return ENXIO; 128 } 129 130 int 131 devopen(struct open_file *f, const char *fname, char **file) 132 { 133 int error; 134 int dev; 135 char count, lun, part; 136 struct devsw *dp; 137 138 dev = 0; /* default device is first in table (usually scsi disk) */ 139 count = 0; 140 lun = 0; 141 part = 0; 142 143 if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0) 144 return error; 145 146 dp = &devsw[dev]; 147 148 if ((void *)dp->dv_open == (void *)nodev) 149 return ENXIO; 150 151 f->f_dev = dp; 152 153 if ((error = (*dp->dv_open)(f, count, lun, part)) != 0) 154 printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name, 155 count, lun, part, error, strerror(error)); 156 157 return error; 158 } 159