1 /* $NetBSD: devopen.c,v 1.1.1.1 1998/06/09 07:53:06 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 36 atoi(const char *cp) 37 { 38 int val = 0; 39 40 while(isdigit(*cp)) 41 val = val * 10 + (*cp++ - '0'); 42 return val; 43 } 44 45 int 46 devlookup(const char *d, int len) 47 { 48 struct devsw *dp = devsw; 49 int i; 50 51 for (i = 0; i < ndevs; i++, dp++) 52 if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0) 53 return i; 54 55 for (i = 0; i < len; i++) 56 printf("%c", d[i]); 57 printf(": no such device - Configured devices are:\n"); 58 for (dp = devsw, i = 0; i < ndevs; i++, dp++) 59 if (dp->dv_name && (void *)dp->dv_open != (void *)nodev) 60 printf(" %s", dp->dv_name); 61 printf("\n"); 62 errno = ENXIO; 63 return -1; 64 } 65 66 /* 67 * Parse a device spec. 68 * 69 * Format: 70 * dev(count, lun, part)file 71 */ 72 int 73 devparse(const char *fname, int *dev, 74 char *count, char *lun, char *part, char **file) 75 { 76 int i; 77 const char *s, *args[3]; 78 79 /* get device name */ 80 for (s = fname; *s && *s != '/' && *s != '('; s++) 81 ; 82 83 if (*s == '(') { 84 /* lookup device and get index */ 85 if ((*dev = devlookup(fname, s - fname)) < 0) 86 goto baddev; 87 88 /* tokenize device ident */ 89 args[0] = ++s; 90 for (i = 1; *s && *s != ')' && i<3; s++) { 91 if (*s == ',') 92 args[i++] = ++s; 93 } 94 if (*s != ')') 95 goto baddev; 96 97 switch(i) { 98 case 3: 99 *count = atoi(args[0]); 100 *lun = atoi(args[1]); 101 *part = atoi(args[2]); 102 break; 103 case 2: 104 *lun = atoi(args[0]); 105 *part = atoi(args[1]); 106 break; 107 case 1: 108 *part = atoi(args[0]); 109 break; 110 case 0: 111 break; 112 } 113 *file = (char *)++s; /* XXX discard const */ 114 } 115 /* no device present */ 116 else 117 *file = (char *)fname; /* XXX discard const */ 118 119 return 0; 120 121 baddev: 122 return ENXIO; 123 } 124 125 int 126 devopen(struct open_file *f, const char *fname, char **file) 127 { 128 int error; 129 int dev; 130 char count, lun, part; 131 struct devsw *dp; 132 133 dev = 0; /* default device is first in table (usually scsi disk) */ 134 count = 0; 135 lun = 0; 136 part = 0; 137 138 if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0) 139 return error; 140 141 dp = &devsw[dev]; 142 143 if ((void *)dp->dv_open == (void *)nodev) 144 return ENXIO; 145 146 f->f_dev = dp; 147 148 if ((error = (*dp->dv_open)(f, count, lun, part)) != 0) 149 printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name, 150 count, lun, part, error, strerror(error)); 151 152 return error; 153 } 154