1 /* $NetBSD: devopen.c,v 1.15 2003/08/07 16:29:15 agc 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 #include <lib/libkern/libkern.h> 39 40 /* 41 * Decode the string 'fname', open the device and return the remaining 42 * file name if any. 43 */ 44 int 45 devopen(f, fname, file) 46 struct open_file *f; 47 const char *fname; 48 char **file; /* out */ 49 { 50 int ctlr = 0, unit = 0, part = 0; 51 int c, rc; 52 char namebuf[20]; 53 const char *cp; 54 char *ncp; 55 #if !defined(LIBSA_SINGLE_DEVICE) 56 int i; 57 struct devsw *dp; 58 #endif 59 60 cp = fname; 61 ncp = namebuf; 62 63 /* 64 * look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd 65 * or 3/tftp/netbsd 66 */ 67 if ((c = *cp) >= '0' && c <= '9') { 68 ctlr = c - '0'; 69 /* skip the '/' */ 70 if (*++cp != '/') 71 return (ENXIO); 72 cp++; 73 while ((c = *cp) != '\0') { 74 if (c == '/') 75 break; 76 if (c >= '0' && c <= '9') { 77 /* read unit number */ 78 unit = c - '0'; 79 80 /* look for a partition */ 81 if ((c = *++cp) >= 'a' && c <= 'h') { 82 part = c - 'a'; 83 c = *++cp; 84 } 85 if (c != '/') 86 return (ENXIO); 87 cp++; 88 break; 89 } 90 if (ncp < namebuf + sizeof(namebuf) - 1) 91 *ncp++ = c; 92 cp++; 93 } 94 } else { 95 /* expect a string like 'rz(0,0,0)netbsd' */ 96 while ((c = *cp) != '\0') { 97 if (c == '(') { 98 cp++; 99 break; 100 } 101 if (ncp < namebuf + sizeof(namebuf) - 1) 102 *ncp++ = c; 103 cp++; 104 } 105 106 /* get controller number */ 107 if ((c = *cp) >= '0' && c <= '9') { 108 ctlr = c - '0'; 109 c = *++cp; 110 } 111 112 if (c == ',') { 113 /* get SCSI device number */ 114 if ((c = *++cp) >= '0' && c <= '9') { 115 unit = c - '0'; 116 c = *++cp; 117 } 118 119 if (c == ',') { 120 /* get partition number */ 121 if ((c = *++cp) >= '0' && c <= '9') { 122 part = c - '0'; 123 c = *++cp; 124 } 125 } 126 } 127 if (c != ')') 128 return (ENXIO); 129 cp++; 130 } 131 *ncp = '\0'; 132 133 #ifdef LIBSA_SINGLE_DEVICE 134 rc = DEV_OPEN(dp)(f, ctlr, unit, part); 135 #else /* !LIBSA_SINGLE_DEVICE */ 136 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 137 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0) 138 goto fnd; 139 printf("Unknown device '%s'\nKnown devices are:", namebuf); 140 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 141 if (dp->dv_name) 142 printf(" %s", dp->dv_name); 143 printf("\n"); 144 return (ENXIO); 145 146 fnd: 147 #ifdef BOOTNET 148 if (strcmp(namebuf, "tftp") == 0) 149 rc = (dp->dv_open)(f, namebuf); 150 else 151 #endif /* BOOTNET */ 152 rc = (dp->dv_open)(f, ctlr, unit, part); 153 #endif /* !LIBSA_SINGLE_DEVICE */ 154 if (rc) 155 return (rc); 156 157 #ifndef LIBSA_SINGLE_DEVICE 158 f->f_dev = dp; 159 #endif 160 if (file && *cp != '\0') 161 *file = (char *)cp; /* XXX */ 162 return (0); 163 } 164