1 /* $NetBSD: devopen.c,v 1.2 2018/03/06 22:13:14 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 #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(struct open_file *f, 46 const char *fname, 47 char **file) /* out */ 48 { 49 int ctlr = 0, unit = 0, part = 0; 50 int c, rc; 51 char device_name[20]; 52 const char *cp; 53 char *ncp; 54 #if !defined(LIBSA_SINGLE_DEVICE) 55 int i; 56 struct devsw *dp; 57 #endif 58 59 cp = fname; 60 ncp = device_name; 61 62 /* 63 * Require the form CTRL/DEVNAME(UNIT,PART)/FILENAME 64 * e.g. '0/ace(0,0)/netbsd' '0/tftp(0,0)/netbsd' 65 */ 66 67 /* get controller number */ 68 c = *cp++; 69 if (c < '0' || c > '9') 70 return ENXIO; 71 ctlr = c - '0'; 72 73 c = *cp++; 74 if (c != '/') 75 return ENXIO; 76 77 /* get device name */ 78 while ((c = *cp) != '\0') { 79 if ((c == '(') || (c == '/')) { 80 cp++; 81 break; 82 } 83 if (ncp < device_name + sizeof(device_name) - 1) 84 *ncp++ = c; 85 cp++; 86 } 87 if (ncp == device_name) 88 return ENXIO; 89 90 /* get device number */ 91 c = *cp++; 92 if (c < '0' || c > '9') 93 return ENXIO; 94 unit = c - '0'; 95 96 c = *cp++; 97 if (c != ',') 98 return (ENXIO); 99 100 /* get partition number */ 101 c = *cp++; 102 if (c < '0' || c > '9') 103 return ENXIO; 104 part = c - '0'; 105 106 c = *cp++; 107 if (c != ')') 108 return ENXIO; 109 110 *ncp = '\0'; 111 112 #ifdef LIBSA_SINGLE_DEVICE 113 rc = DEV_OPEN(dp)(f, ctlr, unit, part); 114 #else /* !LIBSA_SINGLE_DEVICE */ 115 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 116 if (dp->dv_name && strcmp(device_name, dp->dv_name) == 0) 117 goto fnd; 118 printf("Unknown device '%s'\nKnown devices are:", device_name); 119 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 120 if (dp->dv_name) 121 printf(" %s", dp->dv_name); 122 printf("\n"); 123 return ENXIO; 124 125 fnd: 126 #ifdef BOOTNET 127 if (strcmp(device_name, "tftp") == 0) 128 rc = (dp->dv_open)(f, device_name); 129 else 130 #endif /* BOOTNET */ 131 rc = (dp->dv_open)(f, ctlr, unit, part, cp); 132 #endif /* !LIBSA_SINGLE_DEVICE */ 133 if (rc) 134 return rc; 135 136 #ifndef LIBSA_SINGLE_DEVICE 137 f->f_dev = dp; 138 #endif 139 if (file && *cp != '\0') 140 *file = (char *)cp; /* XXX */ 141 return 0; 142 } 143