1 /* $OpenBSD: devopen.c,v 1.3 1996/10/30 22:40:41 niklas Exp $ */ 2 /* $NetBSD: devopen.c,v 1.1 1995/11/23 02:39:37 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Ralph Campbell. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)devopen.c 8.1 (Berkeley) 6/10/93 40 */ 41 42 #include <lib/libsa/stand.h> 43 44 /* 45 * Decode the string 'fname', open the device and return the remaining 46 * file name if any. 47 */ 48 devopen(f, fname, file) 49 struct open_file *f; 50 const char *fname; 51 char **file; /* out */ 52 { 53 register char *cp; 54 register char *ncp; 55 register struct devsw *dp; 56 register int c, i; 57 int ctlr = 0, unit = 0, part = 0; 58 char namebuf[20]; 59 int rc; 60 61 cp = (char *)fname; 62 ncp = namebuf; 63 64 /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */ 65 if ((c = *cp) >= '0' && c <= '9') { 66 ctlr = c - '0'; 67 /* skip the '/' */ 68 if (*++cp != '/') 69 return (ENXIO); 70 cp++; 71 while ((c = *cp) != '\0') { 72 if (c == '/') 73 break; 74 if (c >= '0' && c <= '9') { 75 /* read unit number */ 76 unit = c - '0'; 77 78 /* look for a partition */ 79 if ((c = *++cp) >= 'a' && c <= 'h') { 80 part = c - 'a'; 81 c = *++cp; 82 } 83 if (c != '/') 84 return (ENXIO); 85 break; 86 } 87 if (ncp < namebuf + sizeof(namebuf) - 1) 88 *ncp++ = c; 89 cp++; 90 } 91 *ncp = '\0'; 92 /* 93 * XXX 94 * pulling strchr from the C library, should pull from libkern. 95 */ 96 } else if (strchr(cp, '(')) { 97 /* expect a string like 'rz(0,0,0)vmunix' */ 98 while ((c = *cp) != '\0') { 99 if (c == '(') { 100 cp++; 101 break; 102 } 103 if (ncp < namebuf + sizeof(namebuf) - 1) 104 *ncp++ = c; 105 cp++; 106 } 107 108 /* get controller number */ 109 if ((c = *cp) >= '0' && c <= '9') { 110 ctlr = c - '0'; 111 c = *++cp; 112 } 113 114 if (c == ',') { 115 /* get SCSI device number */ 116 if ((c = *++cp) >= '0' && c <= '9') { 117 unit = c - '0'; 118 c = *++cp; 119 } 120 121 if (c == ',') { 122 /* get partition number */ 123 if ((c = *++cp) >= '0' && c <= '9') { 124 part = c - '0'; 125 c = *++cp; 126 } 127 } 128 } 129 if (c != ')') 130 return (ENXIO); 131 cp++; 132 *ncp = '\0'; 133 } else { 134 dp = devsw; 135 ctlr = unit = part = 0; 136 goto fnd; 137 } 138 139 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 140 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0) 141 goto fnd; 142 printf("Unknown device '%s'\nKnown devices are:", namebuf); 143 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 144 if (dp->dv_name) 145 printf(" %s", dp->dv_name); 146 printf("\n"); 147 return (ENXIO); 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