1 /* $NetBSD: devopen.c,v 1.3 2005/12/11 12:18:51 christos 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(f, fname, file) 45 struct open_file *f; 46 const char *fname; 47 char **file; /* out */ 48 { 49 register char *cp; 50 register char *ncp; 51 register struct devsw *dp; 52 #if 0 53 register int c, i; 54 #endif 55 int ctlr = 0, unit = 0, part = 0; 56 char namebuf[20]; 57 int rc; 58 59 cp = (char *)fname; 60 ncp = namebuf; 61 62 #if 0 63 /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */ 64 if ((c = *cp) >= '0' && c <= '9') { 65 ctlr = c - '0'; 66 /* skip the '/' */ 67 if (*++cp != '/') 68 return (ENXIO); 69 cp++; 70 while ((c = *cp) != '\0') { 71 if (c == '/') 72 break; 73 if (c >= '0' && c <= '9') { 74 /* read unit number */ 75 unit = c - '0'; 76 77 /* look for a partition */ 78 if ((c = *++cp) >= 'a' && c <= 'h') { 79 part = c - 'a'; 80 c = *++cp; 81 } 82 if (c != '/') 83 return (ENXIO); 84 break; 85 } 86 if (ncp < namebuf + sizeof(namebuf) - 1) 87 *ncp++ = c; 88 cp++; 89 } 90 *ncp = '\0'; 91 /* 92 * XXX 93 * pulling strchr from the C library, should pull from libkern. 94 */ 95 } else if (strchr(cp, '(')) { 96 /* expect a string like 'rz(0,0,0)vmunix' */ 97 while ((c = *cp) != '\0') { 98 if (c == '(') { 99 cp++; 100 break; 101 } 102 if (ncp < namebuf + sizeof(namebuf) - 1) 103 *ncp++ = c; 104 cp++; 105 } 106 107 /* get controller number */ 108 if ((c = *cp) >= '0' && c <= '9') { 109 ctlr = c - '0'; 110 c = *++cp; 111 } 112 113 if (c == ',') { 114 /* get SCSI device number */ 115 if ((c = *++cp) >= '0' && c <= '9') { 116 unit = c - '0'; 117 c = *++cp; 118 } 119 120 if (c == ',') { 121 /* get partition number */ 122 if ((c = *++cp) >= '0' && c <= '9') { 123 part = c - '0'; 124 c = *++cp; 125 } 126 } 127 } 128 if (c != ')') 129 return (ENXIO); 130 cp++; 131 *ncp = '\0'; 132 } else { 133 #endif 134 dp = devsw; 135 ctlr = unit = part = 0; 136 goto fnd; 137 #if 0 138 } 139 140 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 141 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0) 142 goto fnd; 143 printf("Unknown device '%s'\nKnown devices are:", namebuf); 144 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 145 if (dp->dv_name) 146 printf(" %s", dp->dv_name); 147 printf("\n"); 148 return (ENXIO); 149 #endif 150 151 fnd: 152 rc = (dp->dv_open)(f, ctlr, unit, part); 153 if (rc) 154 return (rc); 155 156 f->f_dev = dp; 157 if (file && *cp != '\0') 158 *file = cp; 159 return (0); 160 } 161