/*      $NetBSD: disklabel.c,v 1.37 2012/06/25 22:32:43 abs Exp $       */

/*
* Copyright (c) 1983, 1987, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 5/3/95";
#else
__RCSID("$NetBSD: disklabel.c,v 1.37 2012/06/25 22:32:43 abs Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <sys/param.h>
#define DKTYPENAMES
#define FSTYPENAMES
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#if HAVE_NBTOOL_CONFIG_H
#include <nbinclude/sys/disklabel.h>
#include <nbinclude/disktab.h>
#else
#include <sys/disklabel.h>
#include <disktab.h>
#endif /* HAVE_NBTOOL_CONFIG_H */

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef __weak_alias
__weak_alias(getdiskbyname,_getdiskbyname)
#endif

#if 0
static void     error(int);
#endif
static int      gettype(char *, const char *const *);

static const char *db_array[2] = { _PATH_DISKTAB, 0 };

int
setdisktab(const char *name)
{
       if (!name || !*name)
               return -1;

       db_array[0] = name;
       return 0;
}


struct disklabel *
getdiskbyname(const char *name)
{
       static struct   disklabel disk;
       struct  disklabel *dp = &disk;
       struct partition *pp;
       char    *buf;
       char    *cp, *cq;       /* can't be */
       char    p, max, psize[3], pbsize[3],
               pfsize[3], poffset[3], ptype[3];
       u_int32_t *dx;
       long f;

       _DIAGASSERT(name != NULL);

       if (cgetent(&buf, db_array, name) < 0)
               return NULL;

       memset(&disk, 0, sizeof(disk));
       /*
        * typename
        */
       cq = dp->d_typename;
       cp = buf;
       while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
           (*cq = *cp) && *cq != '|' && *cq != ':')
               cq++, cp++;
       *cq = '\0';
       /*
        * boot name (optional)  xxboot, bootxx
        */
       cgetstr(buf, "b0", &dp->d_boot0);
       cgetstr(buf, "b1", &dp->d_boot1);

       if (cgetstr(buf, "ty", &cq) >= 0) {
               if (strcmp(cq, "removable") == 0)
                       dp->d_flags |= D_REMOVABLE;
               else if (strcmp(cq, "simulated") == 0)
                       dp->d_flags |= D_RAMDISK;
               free(cq);
       }
       if (cgetcap(buf, "sf", ':') != NULL)
               dp->d_flags |= D_BADSECT;

#define getnumdflt(field, dname, dflt) \
   (field) = ((cgetnum(buf, dname, &f) == -1) ? (dflt) : (u_int32_t) f)
#define getnum(field, dname) \
       if (cgetnum(buf, dname, &f) != -1) field = (u_int32_t)f

       getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
       getnum(dp->d_ntracks, "nt");
       getnum(dp->d_nsectors, "ns");
       getnum(dp->d_ncylinders, "nc");

       if (cgetstr(buf, "dt", &cq) >= 0) {
               dp->d_type = gettype(cq, dktypenames);
               free(cq);
       } else
               getnumdflt(dp->d_type, "dt", 0);
       getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
       getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
       getnumdflt(dp->d_rpm, "rm", 3600);
       getnumdflt(dp->d_interleave, "il", 1);
       getnumdflt(dp->d_trackskew, "sk", 0);
       getnumdflt(dp->d_cylskew, "cs", 0);
       getnumdflt(dp->d_headswitch, "hs", 0);
       getnumdflt(dp->d_trkseek, "ts", 0);
       getnumdflt(dp->d_bbsize, "bs", BBSIZE);
       getnumdflt(dp->d_sbsize, "sb", SBLOCKSIZE);
       strcpy(psize, "px");    /* XXX: strcpy is safe */
       strcpy(pbsize, "bx");   /* XXX: strcpy is safe */
       strcpy(pfsize, "fx");   /* XXX: strcpy is safe */
       strcpy(poffset, "ox");  /* XXX: strcpy is safe */
       strcpy(ptype, "tx");    /* XXX: strcpy is safe */
       max = 'a' - 1;
       pp = &dp->d_partitions[0];
       for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
               long ff;

               psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
               if (cgetnum(buf, psize, &ff) == -1)
                       pp->p_size = 0;
               else {
                       pp->p_size = (u_int32_t)ff;
                       getnum(pp->p_offset, poffset);
                       getnumdflt(pp->p_fsize, pfsize, 0);
                       if (pp->p_fsize) {
                               long bsize;

                               if (cgetnum(buf, pbsize, &bsize) == -1)
                                       pp->p_frag = 8;
                               else
                                       pp->p_frag =
                                           (u_int8_t)(bsize / pp->p_fsize);
                       }
                       getnumdflt(pp->p_fstype, ptype, 0);
                       if (pp->p_fstype == 0)
                               if (cgetstr(buf, ptype, &cq) >= 0) {
                                       pp->p_fstype = gettype(cq, fstypenames);
                                       free(cq);
                               }
                       max = p;
               }
       }
       dp->d_npartitions = max + 1 - 'a';
       strcpy(psize, "dx");    /* XXX: strcpy is safe */
       dx = dp->d_drivedata;
       for (p = '0'; p < '0' + NDDATA; p++, dx++) {
               psize[1] = p;
               getnumdflt(*dx, psize, 0);
       }
       dp->d_magic = DISKMAGIC;
       dp->d_magic2 = DISKMAGIC;
       free(buf);
       return (dp);
}

static int
gettype(char *t, const char *const *names)
{
       const char *const *nm;

       _DIAGASSERT(t != NULL);
       _DIAGASSERT(names != NULL);

       for (nm = names; *nm; nm++)
               if (strcasecmp(t, *nm) == 0)
                       return (int)(nm - names);
       if (isdigit((unsigned char) *t))
               return (atoi(t));
       return (0);
}

#if 0
static void
error(err)
       int err;
{
       char *p;

       (void)write(STDERR_FILENO, "disktab: ", 9);
       (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1);
       (void)write(STDERR_FILENO, ": ", 2);
       p = strerror(err);
       (void)write(STDERR_FILENO, p, strlen(p));
       (void)write(STDERR_FILENO, "\n", 1);
}
#endif

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