lib/libc/gen/disklabel.c

   1 /*
   2  * Copyright (c) 1983, 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)disklabel.c      8.2 (Berkeley) 5/3/95
  30  * $FreeBSD: src/lib/libc/gen/disklabel.c,v 1.9.2.1 2001/03/05 08:40:47 obrien Exp $
  31  * $DragonFly: src/lib/libc/gen/disklabel.c,v 1.13 2007/06/18 05:13:34 dillon Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #define DKTYPENAMES
  36 #include <sys/disklabel32.h>
  37 #include <sys/dtype.h>
  38 #include <vfs/ufs/dinode.h>
  39 #include <vfs/ufs/fs.h>
  40
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <ctype.h>
  47 #include <disktab.h>
  48
  49 static int      gettype (const char *, const char **);
  50
  51 struct disklabel32 *
  52 getdiskbyname(const char *name)
  53 {
  54         static struct disklabel32 disk;
  55         struct  disklabel32 *dp = &disk;
  56         struct partition32 *pp;
  57         char    *buf;
  58         char    *db_array[2] = { _PATH_DISKTAB, 0 };
  59         char    *cp, *cq;       /* can't be register */
  60         char    p, max, psize[3], pbsize[3],
  61                 pfsize[3], poffset[3], ptype[3];
  62         u_int32_t *dx;
  63
  64         if (cgetent(&buf, db_array, (char *)name) < 0)
  65                 return NULL;
  66
  67         bzero((char *)&disk, sizeof(disk));
  68         /*
  69          * typename
  70          */
  71         cq = dp->d_typename;
  72         cp = buf;
  73         while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
  74             (*cq = *cp) && *cq != '|' && *cq != ':')
  75                 cq++, cp++;
  76         *cq = '\0';
  77
  78 #define getnumdflt(field, dname, dflt) \
  79         { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
  80
  81         getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
  82         getnumdflt(dp->d_ntracks, "nt", 0);
  83         getnumdflt(dp->d_nsectors, "ns", 0);
  84         getnumdflt(dp->d_ncylinders, "nc", 0);
  85
  86         if (cgetstr(buf, "dt", &cq) > 0)
  87                 dp->d_type = gettype(cq, dktypenames);
  88         else
  89                 getnumdflt(dp->d_type, "dt", 0);
  90         getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
  91         getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
  92         getnumdflt(dp->d_rpm, "rm", 3600);
  93         getnumdflt(dp->d_interleave, "il", 1);
  94         getnumdflt(dp->d_trackskew, "sk", 0);
  95         getnumdflt(dp->d_cylskew, "cs", 0);
  96         getnumdflt(dp->d_headswitch, "hs", 0);
  97         getnumdflt(dp->d_trkseek, "ts", 0);
  98         getnumdflt(dp->d_bbsize, "bs", BBSIZE);
  99         getnumdflt(dp->d_sbsize, "sb", SBSIZE);
 100         strcpy(psize, "px");
 101         strcpy(pbsize, "bx");
 102         strcpy(pfsize, "fx");
 103         strcpy(poffset, "ox");
 104         strcpy(ptype, "tx");
 105         max = 'a' - 1;
 106         pp = &dp->d_partitions[0];
 107         for (p = 'a'; p < 'a' + MAXPARTITIONS32; p++, pp++) {
 108                 long l;
 109                 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
 110                 if (cgetnum(buf, psize, &l) == -1)
 111                         pp->p_size = 0;
 112                 else {
 113                         pp->p_size = l;
 114                         cgetnum(buf, poffset, &l);
 115                         pp->p_offset = l;
 116                         getnumdflt(pp->p_fsize, pfsize, 0);
 117                         if (pp->p_fsize) {
 118                                 long bsize;
 119
 120                                 if (cgetnum(buf, pbsize, &bsize) == 0)
 121                                         pp->p_frag = bsize / pp->p_fsize;
 122                                 else
 123                                         pp->p_frag = 8;
 124                         }
 125                         getnumdflt(pp->p_fstype, ptype, 0);
 126                         if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
 127                                 pp->p_fstype = gettype(cq, fstypenames);
 128                         max = p;
 129                 }
 130         }
 131         dp->d_npartitions = max + 1 - 'a';
 132         strcpy(psize, "dx");
 133         dx = dp->d_drivedata;
 134         for (p = '0'; p < '0' + NDDATA32; p++, dx++) {
 135                 psize[1] = p;
 136                 getnumdflt(*dx, psize, 0);
 137         }
 138         dp->d_magic = DISKMAGIC32;
 139         dp->d_magic2 = DISKMAGIC32;
 140         free(buf);
 141         return (dp);
 142 }
 143
 144 static int
 145 gettype(const char *t, const char **names)
 146 {
 147         const char **nm;
 148
 149         for (nm = names; *nm; nm++)
 150                 if (strcasecmp(t, *nm) == 0)
 151                         return (nm - names);
 152         if (isdigit((unsigned char)*t))
 153                 return (atoi(t));
 154         return (0);
 155 }