sys/arch/alpha/stand/netboot/devopen.c

   1 /* $NetBSD: devopen.c,v 1.6 2005/12/11 12:16:20 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(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 }