1 /* $NetBSD: devopen.c,v 1.7 2009/03/14 21:04:03 dsl 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 39 /* 40 * Decode the string 'fname', open the device and return the remaining 41 * file name if any. 42 */ 43 int 44 devopen(struct open_file *f, const char *fname, char **file) 45 /* file: out */ 46 { 47 register char *cp; 48 register char *ncp; 49 register struct devsw *dp; 50 #if 0 51 register int c, i; 52 #endif 53 int ctlr = 0, unit = 0, part = 0; 54 char namebuf[20]; 55 int rc; 56 57 cp = (char *)fname; 58 ncp = namebuf; 59 60 #if 0 61 /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */ 62 if ((c = *cp) >= '0' && c <= '9') { 63 ctlr = c - '0'; 64 /* skip the '/' */ 65 if (*++cp != '/') 66 return (ENXIO); 67 cp++; 68 while ((c = *cp) != '\0') { 69 if (c == '/') 70 break; 71 if (c >= '0' && c <= '9') { 72 /* read unit number */ 73 unit = c - '0'; 74 75 /* look for a partition */ 76 if ((c = *++cp) >= 'a' && c <= 'h') { 77 part = c - 'a'; 78 c = *++cp; 79 } 80 if (c != '/') 81 return (ENXIO); 82 break; 83 } 84 if (ncp < namebuf + sizeof(namebuf) - 1) 85 *ncp++ = c; 86 cp++; 87 } 88 *ncp = '\0'; 89 /* 90 * XXX 91 * pulling strchr from the C library, should pull from libkern. 92 */ 93 } else if (strchr(cp, '(')) { 94 /* expect a string like 'rz(0,0,0)vmunix' */ 95 while ((c = *cp) != '\0') { 96 if (c == '(') { 97 cp++; 98 break; 99 } 100 if (ncp < namebuf + sizeof(namebuf) - 1) 101 *ncp++ = c; 102 cp++; 103 } 104 105 /* get controller number */ 106 if ((c = *cp) >= '0' && c <= '9') { 107 ctlr = c - '0'; 108 c = *++cp; 109 } 110 111 if (c == ',') { 112 /* get SCSI device number */ 113 if ((c = *++cp) >= '0' && c <= '9') { 114 unit = c - '0'; 115 c = *++cp; 116 } 117 118 if (c == ',') { 119 /* get partition number */ 120 if ((c = *++cp) >= '0' && c <= '9') { 121 part = c - '0'; 122 c = *++cp; 123 } 124 } 125 } 126 if (c != ')') 127 return (ENXIO); 128 cp++; 129 *ncp = '\0'; 130 } else { 131 #endif 132 dp = devsw; 133 ctlr = unit = part = 0; 134 goto fnd; 135 #if 0 136 } 137 138 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 139 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0) 140 goto fnd; 141 printf("Unknown device '%s'\nKnown devices are:", namebuf); 142 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 143 if (dp->dv_name) 144 printf(" %s", dp->dv_name); 145 printf("\n"); 146 return (ENXIO); 147 #endif 148 149 fnd: 150 rc = (dp->dv_open)(f, ctlr, unit, part); 151 if (rc) 152 return (rc); 153 154 f->f_dev = dp; 155 if (file && *cp != '\0') 156 *file = cp; 157 return (0); 158 } 159