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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)disklabel.c      8.2 (Berkeley) 5/3/95
  34  * $FreeBSD: src/lib/libc/gen/disklabel.c,v 1.9.2.1 2001/03/05 08:40:47 obrien Exp $
  35  * $DragonFly: src/lib/libc/gen/disklabel.c,v 1.13 2007/06/18 05:13:34 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #define DKTYPENAMES
  40 #include <sys/disklabel32.h>
  41 #include <sys/dtype.h>
  42 #include <vfs/ufs/dinode.h>
  43 #include <vfs/ufs/fs.h>
  44
  45 #include <fcntl.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <ctype.h>
  51 #include <disktab.h>
  52
  53 static int      gettype (const char *, const char **);
  54
  55 struct disklabel32 *
  56 getdiskbyname(const char *name)
  57 {
  58         static struct disklabel32 disk;
  59         struct  disklabel32 *dp = &disk;
  60         struct partition32 *pp;
  61         char    *buf;
  62         char    *db_array[2] = { _PATH_DISKTAB, 0 };
  63         char    *cp, *cq;       /* can't be register */
  64         char    p, max, psize[3], pbsize[3],
  65                 pfsize[3], poffset[3], ptype[3];
  66         u_int32_t *dx;
  67
  68         if (cgetent(&buf, db_array, (char *)name) < 0)
  69                 return NULL;
  70
  71         bzero((char *)&disk, sizeof(disk));
  72         /*
  73          * typename
  74          */
  75         cq = dp->d_typename;
  76         cp = buf;
  77         while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
  78             (*cq = *cp) && *cq != '|' && *cq != ':')
  79                 cq++, cp++;
  80         *cq = '\0';
  81
  82 #define getnumdflt(field, dname, dflt) \
  83         { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
  84
  85         getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
  86         getnumdflt(dp->d_ntracks, "nt", 0);
  87         getnumdflt(dp->d_nsectors, "ns", 0);
  88         getnumdflt(dp->d_ncylinders, "nc", 0);
  89
  90         if (cgetstr(buf, "dt", &cq) > 0)
  91                 dp->d_type = gettype(cq, dktypenames);
  92         else
  93                 getnumdflt(dp->d_type, "dt", 0);
  94         getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
  95         getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
  96         getnumdflt(dp->d_rpm, "rm", 3600);
  97         getnumdflt(dp->d_interleave, "il", 1);
  98         getnumdflt(dp->d_trackskew, "sk", 0);
  99         getnumdflt(dp->d_cylskew, "cs", 0);
 100         getnumdflt(dp->d_headswitch, "hs", 0);
 101         getnumdflt(dp->d_trkseek, "ts", 0);
 102         getnumdflt(dp->d_bbsize, "bs", BBSIZE);
 103         getnumdflt(dp->d_sbsize, "sb", SBSIZE);
 104         strcpy(psize, "px");
 105         strcpy(pbsize, "bx");
 106         strcpy(pfsize, "fx");
 107         strcpy(poffset, "ox");
 108         strcpy(ptype, "tx");
 109         max = 'a' - 1;
 110         pp = &dp->d_partitions[0];
 111         for (p = 'a'; p < 'a' + MAXPARTITIONS32; p++, pp++) {
 112                 long l;
 113                 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
 114                 if (cgetnum(buf, psize, &l) == -1)
 115                         pp->p_size = 0;
 116                 else {
 117                         pp->p_size = l;
 118                         cgetnum(buf, poffset, &l);
 119                         pp->p_offset = l;
 120                         getnumdflt(pp->p_fsize, pfsize, 0);
 121                         if (pp->p_fsize) {
 122                                 long bsize;
 123
 124                                 if (cgetnum(buf, pbsize, &bsize) == 0)
 125                                         pp->p_frag = bsize / pp->p_fsize;
 126                                 else
 127                                         pp->p_frag = 8;
 128                         }
 129                         getnumdflt(pp->p_fstype, ptype, 0);
 130                         if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
 131                                 pp->p_fstype = gettype(cq, fstypenames);
 132                         max = p;
 133                 }
 134         }
 135         dp->d_npartitions = max + 1 - 'a';
 136         strcpy(psize, "dx");
 137         dx = dp->d_drivedata;
 138         for (p = '0'; p < '0' + NDDATA32; p++, dx++) {
 139                 psize[1] = p;
 140                 getnumdflt(*dx, psize, 0);
 141         }
 142         dp->d_magic = DISKMAGIC32;
 143         dp->d_magic2 = DISKMAGIC32;
 144         free(buf);
 145         return (dp);
 146 }
 147
 148 static int
 149 gettype(const char *t, const char **names)
 150 {
 151         const char **nm;
 152
 153         for (nm = names; *nm; nm++)
 154                 if (strcasecmp(t, *nm) == 0)
 155                         return (nm - names);
 156         if (isdigit((unsigned char)*t))
 157                 return (atoi(t));
 158         return (0);
 159 }