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dosdisk.c

/*
 *    dosdisk.c
 *
 *    MSDOS disk accessing module
 */

#define     DEP_UNICODE
#include "headers.h"
#include "depend.h"
#include "kctype.h"
#include "string.h"
#include "time.h"
#include "sysemu.h"
#include "pathname.h"
#include "dosdisk.h"
#include "unixdisk.h"
#include "kconv.h"

#if   MSDOS
#include <io.h>
#include <sys/timeb.h>
#endif
#ifdef      LINUX
#include <mntent.h>
#include <sys/mount.h>
#include <linux/unistd.h>
# ifndef    BLKFLSBUF
# include <linux/fs.h>
# endif
# if  defined (USELLSEEK) && !defined (_syscall5)
# include <sys/syscall.h>
# undef     _syscall5
# endif
#endif      /* LINUX */

#ifdef      HDDMOUNT
#include <sys/ioctl.h>
# ifdef     BSD4
#  ifdef    NETBSD
#  define   OMIT_FSTYPENUMS         /* For NetBSD >=3.1 */
#  endif
# include <sys/disklabel.h>
# else      /* !BSD4 */
#  ifdef    SOLARIS
#  include <sys/dkio.h>
#  include <sys/vtoc.h>
#  endif
#  ifdef    LINUX
#  include <linux/hdreg.h>
#  endif
# endif     /* !BSD4 */
#endif      /* HDDMOUNT */

#ifdef      SOLARIS
#define     DIOCGDINFO        DKIOCGGEOM
#define     disklabel         dk_geom
#define     d_ntracks         dkg_nhead
#define     d_nsectors        dkg_nsect
#endif
#ifdef      LINUX
#define     D_SECSIZE(dl)           512
#define     DIOCGDINFO        HDIO_GETGEO
#define     disklabel         hd_geometry
#define     d_ntracks         heads
#define     d_nsectors        sectors
#else
#define     D_SECSIZE(dl)           (dl).d_secsize
#endif

#ifndef     MOUNTED
#define     MOUNTED                 "/etc/mtab"
#endif

#if   defined (USELLSEEK) && !defined (_syscall5)
#define     _llseek(f,h,l,r,w)      syscall(SYS__llseek, f, h, l, r, w)
#endif

#define     KC_SJIS1          0001
#define     KC_SJIS2          0002
#define     KC_EUCJP          0010

#define     EXTCOM                  "COM"
#define     EXTEXE                  "EXE"
#define     EXTBAT                  "BAT"

#define     strsizecmp(s1, s2)      strncmp(s1, s2, sizeof(s1))
#define     ENDCLUST          ((long)(0x0fffffff))
#define     ERRCLUST          ((long)(0x0ffffff7))
#define     ROOTCLUST         ((long)(0x10000000))

#ifndef     _NODOSDRIVE

#if   MSDOS && defined (FD)
extern int _dospath __P_((CONST char *));
#define     __dospath         _dospath
#else
#define     __dospath(p)            ((isalpha2(*(p)) && (p)[1] == ':') ? *(p) : 0)
#endif

#ifdef      FD
extern int newdup __P_((int));
#else
#define     newdup(n)         (n)
#endif

#ifdef      USELLSEEK
static l_off_t NEAR Xllseek __P_((int, l_off_t, int));
#else
#define     Xllseek     lseek
#endif
#if   !MSDOS
static int NEAR sectseek __P_((CONST devstat *, u_long));
#endif
static int NEAR realread __P_((CONST devstat *, u_long, u_char *, int));
static int NEAR realwrite __P_((CONST devstat *, u_long, CONST u_char *, int));
static int NEAR killcache __P_((CONST devstat *, int, int));
static int NEAR flushcache __P_((CONST devstat *));
static int NEAR shiftcache __P_((CONST devstat *, int, int));
static int NEAR cachecpy __P_((int, int, int, int));
static int NEAR uniqcache __P_((CONST devstat *, int, u_long, u_long));
static int NEAR appendcache __P_((int, CONST devstat *,
            u_long, CONST u_char *, int, int));
static int NEAR insertcache __P_((int, CONST devstat *,
            u_long, CONST u_char *, int, int));
static int NEAR overwritecache __P_((int, CONST devstat *,
            u_long, CONST u_char *, int, int));
static int NEAR savecache __P_((CONST devstat *,
            u_long, CONST u_char *, int, int));
static int NEAR loadcache __P_((CONST devstat *, u_long, u_char *, int));
static long NEAR sectread __P_((CONST devstat *, u_long, u_char *, int));
static long NEAR sectwrite __P_((CONST devstat *,
            u_long, CONST u_char *, int));
static int NEAR availfat __P_((CONST devstat *));
static int NEAR readfat __P_((devstat *));
static int NEAR writefat __P_((CONST devstat *));
static long NEAR getfatofs __P_((CONST devstat *, long));
static u_char *NEAR readtmpfat __P_((CONST devstat *, long, int));
static long NEAR getfatent __P_((CONST devstat *, long));
static int NEAR putfatent __P_((devstat *, long, long));
static u_long NEAR clust2sect __P_((CONST devstat *, long));
static long NEAR clust32 __P_((CONST devstat *, CONST dent_t *));
static long NEAR newclust __P_((CONST devstat *));
static long NEAR clustread __P_((CONST devstat *, u_char *, long));
static long NEAR clustwrite __P_((devstat *, CONST u_char *, long));
static long NEAR clustexpand __P_((devstat *, long, int));
static int NEAR clustfree __P_((devstat *, long));
#if   !MSDOS
static int NEAR _readbpb __P_((devstat *, CONST bpb_t *));
#endif
static int NEAR readbpb __P_((devstat *, int));
#ifdef      HDDMOUNT
static l_off_t *NEAR _readpt __P_((l_off_t, l_off_t, int, int, int, int));
#endif
static int NEAR _dosopendev __P_((int));
static int NEAR _dosclosedev __P_((int));
static int NEAR calcsum __P_((CONST u_char *));
static u_int NEAR lfnencode __P_((u_int, u_int));
static u_int NEAR lfndecode __P_((u_int, u_int));
#if   !MSDOS
static int NEAR transchar __P_((int));
static int NEAR detranschar __P_((int));
#endif
static int NEAR sfntranschar __P_((int));
static int NEAR cmpdospath __P_((CONST char *, CONST char *, int, int));
static char *NEAR getdosname __P_((char *, CONST u_char *, CONST u_char *));
static u_char *NEAR putdosname __P_((u_char *, CONST char *, int));
static u_int NEAR getdosmode __P_((u_int));
static u_int NEAR putdosmode __P_((u_int));
static time_t NEAR getdostime __P_((u_int, u_int));
static int NEAR putdostime __P_((u_char *, time_t));
static int NEAR getdrive __P_((CONST char *));
static char *NEAR addpath __P_((char *, int, CONST char *, int));
static int NEAR parsepath __P_((char *, CONST char *, int));
static int NEAR seekdent __P_((dosDIR *, dent_t *, long, long));
static int NEAR readdent __P_((dosDIR *, dent_t *, int));
static dosDIR *NEAR _dosopendir __P_((CONST char *, char *, int));
static int NEAR _dosclosedir __P_((dosDIR *));
static struct dosdirent *NEAR _dosreaddir __P_((dosDIR *, int));
static struct dosdirent *NEAR finddirent __P_((dosDIR *,
            CONST char *, int, int));
static dosDIR *NEAR splitpath __P_((CONST char **, char *, int));
static int NEAR getdent __P_((CONST char *, int *));
static int NEAR writedent __P_((int));
static int NEAR expanddent __P_((int));
static int NEAR creatdent __P_((CONST char *, int));
static int NEAR unlinklfn __P_((int, long, long, int));
static long NEAR dosfilbuf __P_((int, int));
static long NEAR dosflsbuf __P_((int));

#if   MSDOS
int dependdosfunc = 0;
#else /* !MSDOS */
int maxfdtype = 0;
#if   defined (DEP_DYNAMICLIST) || !defined (_NOCUSTOMIZE)
int origmaxfdtype = 0;
#endif
#ifdef      DEP_DYNAMICLIST
fdtype_t fdtype = NULL;
origfdtype_t origfdtype
#else /* !DEP_DYNAMICLIST */
# ifndef    _NOCUSTOMIZE
origfdtype_t origfdtype = NULL;
# endif
fdtype_t fdtype
#endif      /* !DEP_DYNAMICLIST */
= {
#if   defined (SOLARIS) || defined (SUN_OS)
      {'A', "/dev/rfd0c", 2, 18, 80},
      {'A', "/dev/rfd0c", 2, 9, 80},
      {'A', "/dev/rfd0c", 2, 8 + 100, 80},
#endif
#if   defined (NEWS_OS3) || defined (NEWS_OS4)
# if  defined (news800) || defined (news900) \
|| defined (news1800) || defined (news1900) || defined (news3800)
      {'A', "/dev/rfh0a", 2, 18, 80},
      {'A', "/dev/rfd0a", 2, 9, 80},
      {'A', "/dev/rfd0a", 2, 8 + 100, 80},
# else
#  if defined (news3100) || defined (news5000)
      {'A', "/dev/rfd00a", 2, 18, 80},
      {'A', "/dev/rfd00a", 2, 9, 80},
      {'A', "/dev/rfd00a", 2, 8 + 100, 80},
#  else
      {'A', "/dev/rfd00a", 2, 18, 80},
      {'A', "/dev/rfd01a", 2, 9, 80},
      {'A', "/dev/rfd03a", 2, 8, 80},
#  endif
# endif
#endif
#if   defined (NEWS_OS6)
      {'A', "/dev/rfloppy/c0d0u0p0", 2, 18, 80},
      {'A', "/dev/rfloppy/c0d0u1p0", 2, 9, 80},
      {'A', "/dev/rfloppy/c0d0u3p0", 2, 8, 80},
#endif
#if   defined (HPUX)
# if  defined (__hp9000s700)
      {'A', "/dev/rfloppy/c201d0s0", 2, 18, 80},
      {'A', "/dev/rfloppy/c201d0s0", 2, 9, 80},
      {'A', "/dev/rfloppy/c201d0s0", 2, 8 + 100, 80},
# endif
#endif
#if   defined (EWSUXV)
      {'A', "/dev/if/f0h18", 2, 18, 80},
      {'A', "/dev/if/f0h8", 2, 8, 77},
      {'A', "/dev/if/f0c15", 2, 15, 80},
      {'A', "/dev/if/f0d9", 2, 9, 80},
      {'A', "/dev/if/f0d8", 2, 8, 80},
#endif
#if   defined (AIX)
      {'A', "/dev/rfd0h", 2, 18, 80},
      {'A', "/dev/rfd0l", 2, 9, 80},
      {'A', "/dev/rfd0l", 2, 8 + 100, 80},
#endif
#if   defined (ULTRIX)
      {'A', "/dev/rfh0a", 2, 18, 80},
      {'A', "/dev/rfd0a", 2, 9, 80},
      {'A', "/dev/rfd0a", 2, 8 + 100, 80},
#endif
#if   defined (UXPDS)
      {'A', "/dev/fpd0", 2, 18, 80},
      {'A', "/dev/fpd0", 2, 9, 80},
      {'A', "/dev/fpd0", 2, 8 + 100, 80},
#endif
#if   defined (CYGWIN)
      {'A', "/dev/fd0", 2, 18, 80},
      {'A', "/dev/fd0", 2, 9, 80},
      {'A', "/dev/fd0", 2, 8 + 100, 80},
#endif
#if   defined (LINUX)
      {'A', "/dev/fd0", 2, 18, 80},
      {'A', "/dev/fd0", 2, 9, 80},
      {'A', "/dev/fd0", 2, 8 + 100, 80},
#endif
#if   defined (JCCBSD)
      {'A', "/dev/rfd0a", 2, 18, 80},
      {'A', "/dev/rfd0b", 2, 8, 77},
      {'A', "/dev/rfd0c", 2, 9, 80},
      {'A', "/dev/rfd0d", 2, 8, 80},
#endif
#if   defined (FREEBSD)
# if  __FreeBSD__ < 5
      {'A', "/dev/rfd0.1440", 2, 18, 80},
      {'A', "/dev/rfd0.720", 2, 9, 80},
      {'A', "/dev/rfd0.720", 2, 8 + 100, 80},
# else
      /* FreeBSD >=5.0 has not any buffered device */
      {'A', "/dev/fd0.1440", 2, 18, 80},
      {'A', "/dev/fd0.720", 2, 9, 80},
      {'A', "/dev/fd0.720", 2, 8 + 100, 80},
# endif
#endif
#if   defined (NETBSD)
# if  defined (i386)
      {'A', "/dev/rfd0a", 2, 18, 80},
      {'A', "/dev/rfd0a", 2, 15, 80},
      {'A', "/dev/rfd0c", 2, 9, 80},
      {'A', "/dev/rfd0c", 2, 8 + 100, 80},
# endif
#endif
#if   defined (BSDOS)
# if  defined (i386)
      {'A', "/dev/rfd0c", 2, 18, 80},
      {'A', "/dev/rfd0c", 2, 9, 80},
      {'A', "/dev/rfd0c", 2, 8 + 100, 80},
# endif
#endif
#if   defined (OPENBSD)
      {'A', "/dev/rfd0Bc", 2, 18, 80},
      {'A', "/dev/rfd0Fc", 2, 9, 80},
      {'A', "/dev/rfd0Fc", 2, 8 + 100, 80},
#endif
#if   defined (ORG_386BSD)
# if  defined (i386)
      {'A', "/dev/fd0a", 2, 18, 80},
      {'A', "/dev/fd0a", 2, 15, 80},
      {'A', "/dev/fd0b", 2, 8, 77},
      {'A', "/dev/fd0c", 2, 9, 80},
      {'A', "/dev/fd0c", 2, 8 + 100, 80},
# endif
#endif
      {'\0', NULL, 0, 0, 0}
};
#if   0
devinfo CONST mediadescr[] = {
      {0xff, "2D-8SECT", 2, 8, 40},
      {0xfe, "1D-8SECT", 1, 8, 40},
      {0xfd, "2D-9SECT", 2, 9, 40},
      {0xfc, "1D-9SECT", 1, 9, 40},
      {0xfb, "2DD-8SECT", 2, 8 + 100, 80},
      {0xf9, "2DD-9SECT", 2, 9, 80},
      {0xf9, "2HD-15SECT", 2, 15, 80},
      {0xf8, "HDD", 0, 0, 0},
      {0xf0, "2HD-18SECT", 2, 18, 80},
      {0x02, "2HD-15SECT", 2, 15, 80},
      {0x01, "2HD-8SECT", 2, 8, 77},
      {0x00, NULL, 0, 0, 0}
};
#endif
#endif      /* !MSDOS */
int lastdrive = -1;
int needbavail = 0;
VOID_T (*doswaitfunc)__P_((VOID_A)) = NULL;
int (*dosintrfunc)__P_((VOID_A)) = NULL;

static char *curdir['Z' - 'A' + 1];
static devstat devlist[DOSNOFILE];
static int maxdev = 0;
static int devorder[DOSNOFILE];
static int maxorder = 0;
static dosFILE dosflist[DOSNOFILE];
static int maxdosf = 0;
static u_char cachedrive[SECTCACHESIZE];
static u_long sectno[SECTCACHESIZE];
static u_char *sectcache[SECTCACHESIZE];
static u_char cachesize[SECTCACHESIZE];
static u_char cachewrite[SECTCACHESIZE];
static int maxsectcache = 0;
static long maxcachemem = 0L;
static long lfn_clust = -1L;
static long lfn_offset = 0L;
static int doserrno = 0;
#if   !MSDOS
static CONST short sectsizelist[] = SECTSIZE;
#define     SLISTSIZ          arraysize(sectsizelist)
#endif
static CONST char *inhibitname[] = INHIBITNAME;
#define     INHIBITNAMESIZ          arraysize(inhibitname)


#ifdef      USELLSEEK
# ifdef     _syscall5
# undef     _llseek
static _syscall5(int, _llseek,
      u_int, fd,
      u_long, ofs_h,
      u_long, ofs_l,
      l_off_t *, result,
      u_int, whence);
# endif

static l_off_t NEAR Xllseek(fd, offset, whence)
int fd;
l_off_t offset;
int whence;
{
      l_off_t result;
      u_long ofs_h, ofs_l;

      ofs_h = (u_long)(offset >> 32);
      ofs_l = (u_long)(offset & (u_long)0xffffffff);
      if (_llseek(fd, ofs_h, ofs_l, &result, whence) < 0)
            return((l_off_t)-1);

      return(result);
}
#endif      /* USELLSEEK */

#if   !MSDOS
static int NEAR sectseek(devp, sect)
CONST devstat *devp;
u_long sect;
{
      l_off_t offset;
      int duperrno;

      duperrno = errno;
      if (devp -> flags & F_8SECT) sect += sect / 8;
      offset = (l_off_t)sect * (l_off_t)(devp -> sectsize);
# ifdef     HDDMOUNT
      offset += devp -> offset;
# endif
      if (Xllseek(devp -> fd, offset, L_SET) < (l_off_t)0) {
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }
      errno = duperrno;

      return(0);
}
#endif      /* !MSDOS */

static int NEAR realread(devp, sect, buf, n)
CONST devstat *devp;
u_long sect;
u_char *buf;
int n;
{
      int duperrno;

      duperrno = errno;
#if   MSDOS
      n = rawdiskio(devp -> drive, sect, buf, n, devp -> sectsize, 0);
      if (n < 0) {
            doserrno = errno;
            return(-1);
      }
#else
      if (sectseek(devp, sect) < 0) return(-1);
      while (read(devp -> fd, buf, (long)n * devp -> sectsize) < 0) {
            if (errno == EINTR) errno = duperrno;
            else {
                  doserrno = errno;
                  return(-1);
            }
      }
#endif
      errno = duperrno;

      return(0);
}

static int NEAR realwrite(devp, sect, buf, n)
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n;
{
      int duperrno;

      duperrno = errno;
#if   MSDOS
      n = rawdiskio(devp -> drive, sect,
            (u_char *)buf, n, devp -> sectsize, 1);
      if (n < 0) {
            doserrno = errno;
            return(-1);
      }
#else
      if (sectseek(devp, sect) < 0) return(-1);
      if (write(devp -> fd, buf, (long)n * devp -> sectsize) < 0) {
            if (errno == EINTR) errno = duperrno;
            else {
                  doserrno = errno;
                  return(-1);
            }
      }
#endif
      errno = duperrno;

      return(0);
}

static int NEAR killcache(devp, n, size)
CONST devstat *devp;
int n, size;
{
      int i, top;

      top = n - size;
      for (i = n; i > top; i--) {
            if (cachewrite[i]) {
                  if (devp -> flags & F_RONLY) {
                        doserrno = EROFS;
                        n = -1;
                  }
                  if (realwrite(devp, sectno[i], sectcache[i], 1) < 0)
                        n = -1;
            }
            free(sectcache[i]);
            cachewrite[i] = 0;
      }

      return(n);
}

static int NEAR flushcache(devp)
CONST devstat *devp;
{
      int i, n;

      n = 0;
      for (i = maxsectcache - 1; i >= 0; i--) {
            if (cachedrive[i] != devp -> drive) continue;
            if (cachewrite[i] && !(devp -> flags & F_RONLY)
            && realwrite(devp, sectno[i], sectcache[i], 1) < 0)
                  n = -1;
            cachewrite[i] = 0;
      }

      return(n);
}

static int NEAR shiftcache(devp, n, nsect)
CONST devstat *devp;
int n, nsect;
{
      u_char *cachebuf[SECTCACHESIZE], wrtbuf[SECTCACHESIZE];
      u_long no;
      int i, drive, size;

      for (; n < maxsectcache - 1; n++) if (cachesize[n + 1] <= 1) break;
      drive = cachedrive[n];
      no = sectno[n];
      size = cachesize[n];

      if (!devp) {
            for (i = 0; i < maxdev; i++) if (devlist[i].drive == drive) {
                  devp = &(devlist[i]);
                  break;
            }
      }
      if (nsect < 0) {
            if (killcache(devp, n, size) < 0) return(SECTCACHESIZE + 1);
      }
      else for (i = 0; i < size; i++) {
            cachebuf[i] = sectcache[n - i];
            wrtbuf[i] = cachewrite[n - i];
      }

      for (i = n - size + 1; i < maxsectcache - size; i++) {
            cachedrive[i] = cachedrive[i + size];
            sectno[i] = sectno[i + size];
            sectcache[i] = sectcache[i + size];
            cachesize[i] = cachesize[i + size];
            cachewrite[i] = cachewrite[i + size];
      }
      maxsectcache -= size;
      maxcachemem -= size * devp -> sectsize;

      n = size;
      if (nsect < 0) return(n);

      if (!nsect) nsect = size;
      while (maxsectcache > 0
      && (maxsectcache + nsect > SECTCACHESIZE
      || maxcachemem + nsect * devp -> sectsize > SECTCACHEMEM)) {
            if ((i = shiftcache(NULL, 0, -1)) > SECTCACHESIZE)
                  return(SECTCACHESIZE + 1);
            n += i;
      }
      maxsectcache += nsect;
      maxcachemem += nsect * devp -> sectsize;
      n -= nsect;

      for (i = 0; i < nsect; i++) {
            cachedrive[maxsectcache - i - 1] = drive;
            sectno[maxsectcache - i - 1] = no + i;
            sectcache[maxsectcache - i - 1] = cachebuf[i];
            cachesize[maxsectcache - i - 1] = nsect - i;
            cachewrite[maxsectcache - i - 1] = wrtbuf[i];
      }

      return(n);
}

static int NEAR cachecpy(n, ofs1, ofs2, size)
int n, ofs1, ofs2, size;
{
      int i;

      if (ofs1 <= ofs2) for (i = 0; i < size; i++) {
            sectcache[n - ofs1 - i] = sectcache[n - ofs2 - i];
            cachewrite[n - ofs1 - i] = cachewrite[n - ofs2 - i];
      }
      else for (i = size - 1; i >= 0; i--) {
            sectcache[n - ofs1 - i] = sectcache[n - ofs2 - i];
            cachewrite[n - ofs1 - i] = cachewrite[n - ofs2 - i];
      }

      return(size);
}

static int NEAR uniqcache(devp, n, min, max)
CONST devstat *devp;
int n;
u_long min, max;
{
      int i, j, size;

      if (min >= max) return(0);
      for (i = n - cachesize[n]; i >= 0; i -= cachesize[i]) {
            if (devp -> drive != cachedrive[i]) continue;
            if (min <= sectno[i] && max >= sectno[i] + cachesize[i])
                  return(shiftcache(devp, i, -1));
            if (min > sectno[i] && min < sectno[i] + cachesize[i]) {
                  size = min - sectno[i];
                  for (j = 0; j < size; j++)
                        cachesize[i - j] = size - j;
                  return(shiftcache(devp, i - size, -1));
            }
            if (max > sectno[i] && max < sectno[i] + cachesize[i]) {
                  size = max - sectno[i];
                  for (j = 0; j < size; j++)
                        cachesize[i - j] = size - j;
                  return(shiftcache(devp, i, -1));
            }
      }

      return(0);
}

static int NEAR appendcache(dst, devp, sect, buf, n, wrt)
int dst;
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n, wrt;
{
      u_long min, max;
      int i, size, duperrno;

      duperrno = errno;
      min = sectno[dst];
      max = min + cachesize[dst];
      size = sect + n - min;

      if (devp -> sectsize > STDSECTSIZE
      && size * devp -> sectsize > SECTCACHEMEM) {
            size = SECTCACHEMEM / devp -> sectsize;
            min = sect + n - size;
            if (killcache(devp, dst, (int)(min - sectno[dst])) < 0)
                  return(-1);
            cachecpy(dst, 0, (int)(min - sectno[dst]), (int)(max - min));
      }
      else if (size > SECTCACHESIZE) {
            min += size - SECTCACHESIZE;
            size = SECTCACHESIZE;
            if (killcache(devp, dst, (int)(min - sectno[dst])) < 0)
                  return(-1);
            cachecpy(dst, 0, (int)(min - sectno[dst]), (int)(max - min));
      }
      else if (size < cachesize[dst]) size = cachesize[dst];

      if ((i = uniqcache(devp, dst, max, sect + n)) > SECTCACHESIZE)
            return(-1);
      dst -= i;
      sectno[dst] = min;
      if (shiftcache(devp, dst, size) > SECTCACHESIZE) return(-1);

      dst = maxsectcache - 1 - (sect - min);
      for (i = 0; i < n; i++) {
            if (i + sect < max) cachewrite[dst - i] |= wrt;
            else {
                  sectcache[dst - i] =
                        (u_char *)malloc(devp -> sectsize);
                  if (!sectcache[dst - i]) {
                        doserrno = errno;
                        errno = duperrno;
                        return(-1);
                  }
                  cachewrite[dst - i] = wrt;
            }
            memcpy((char *)sectcache[dst - i],
                  (char *)buf, devp -> sectsize);
            buf += devp -> sectsize;
      }

      return(0);
}

static int NEAR insertcache(dst, devp, sect, buf, n, wrt)
int dst;
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n, wrt;
{
      u_long min, max;
      int i, size, duperrno;

      duperrno = errno;
      min = sectno[dst];
      max = min + cachesize[dst];
      size = max - sect;

      if (devp -> sectsize > STDSECTSIZE
      && size * devp -> sectsize > SECTCACHEMEM) {
            size = SECTCACHEMEM / devp -> sectsize;
            max = sect + size;
            i = dst - (max - min);
            if (killcache(devp, i, cachesize[i]) < 0) return(-1);
      }
      else if (size > SECTCACHESIZE) {
            size = SECTCACHESIZE;
            max = sect + size;
            i = dst - (max - min);
            if (killcache(devp, i, cachesize[i]) < 0) return(-1);
      }
      else if (size < cachesize[dst]) size = cachesize[dst];

      if ((i = uniqcache(devp, dst, sect, min)) > SECTCACHESIZE) return(-1);
      dst -= i;
      sectno[dst] = sect;
      if (shiftcache(devp, dst, size) > SECTCACHESIZE) return(-1);

      dst = maxsectcache - 1;
      cachecpy(dst, (int)(min - sect), 0, (int)(max - min));
      for (i = 0; i < n; i++) {
            if (i + sect >= min) cachewrite[dst - i] |= wrt;
            else {
                  sectcache[dst - i] =
                        (u_char *)malloc(devp -> sectsize);
                  if (!sectcache[dst - i]) {
                        doserrno = errno;
                        errno = duperrno;
                        return(-1);
                  }
                  cachewrite[dst - i] = wrt;
            }
            memcpy((char *)sectcache[dst - i],
                  (char *)buf, devp -> sectsize);
            buf += devp -> sectsize;
      }

      return(0);
}

static int NEAR overwritecache(dst, devp, sect, buf, n, wrt)
int dst;
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n, wrt;
{
      u_long min, max;
      int i, size, duperrno;

      duperrno = errno;
      min = sectno[dst];
      max = min + cachesize[dst];
      size = n;

      if (size < cachesize[dst]) size = cachesize[dst];
      if ((i = uniqcache(devp, dst, sect, min)) > SECTCACHESIZE) return(-1);
      dst -= i;
      if ((i = uniqcache(devp, dst, max, sect + n)) > SECTCACHESIZE)
            return(-1);
      dst -= i;
      sectno[dst] = sect;
      if (shiftcache(devp, dst, size) > SECTCACHESIZE) return(-1);

      dst = maxsectcache - 1;
      cachecpy(dst, (int)(min - sect), 0, (int)(max - min));
      for (i = 0; i < n; i++) {
            if (i + sect >= min && i + sect < max)
                  cachewrite[dst - i] |= wrt;
            else {
                  sectcache[dst - i] =
                        (u_char *)malloc(devp -> sectsize);
                  if (!sectcache[dst - i]) {
                        doserrno = errno;
                        errno = duperrno;
                        return(-1);
                  }
                  cachewrite[dst - i] = wrt;
            }
            memcpy((char *)sectcache[dst - i],
                  (char *)buf, devp -> sectsize);
            buf += devp -> sectsize;
      }

      return(0);
}

static int NEAR savecache(devp, sect, buf, n, wrt)
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n, wrt;
{
      int i, duperrno;

      if (n > SECTCACHESIZE || n * devp -> sectsize > SECTCACHEMEM)
            return(-1);

      for (i = maxsectcache - 1; i >= 0; i -= cachesize[i]) {
            if (devp -> drive != cachedrive[i]) continue;
            if (sect >= sectno[i] && sect <= sectno[i] + cachesize[i])
                  return(appendcache(i, devp, sect, buf, n, wrt));
            if (sect + n >= sectno[i]
            && sect + n <= sectno[i] + cachesize[i])
                  return(insertcache(i, devp, sect, buf, n, wrt));
            if (sect <= sectno[i]
            && sect + n >= sectno[i] + cachesize[i])
                  return(overwritecache(i, devp, sect, buf, n, wrt));
      }

      duperrno = errno;
      while (maxsectcache > 0
      && (maxsectcache + n > SECTCACHESIZE
      || maxcachemem + n * devp -> sectsize > SECTCACHEMEM)) {
            if (shiftcache(NULL, 0, -1) > SECTCACHESIZE) return(-1);
      }
      maxsectcache += n;
      maxcachemem += n * devp -> sectsize;
      for (i = 0; i < n; i++) {
            cachedrive[maxsectcache - i - 1] = devp -> drive;
            sectno[maxsectcache - i - 1] = sect + i;
            sectcache[maxsectcache - i - 1] =
                  (u_char *)malloc(devp -> sectsize);
            if (!sectcache[maxsectcache - i - 1]) {
                  doserrno = errno;
                  errno = duperrno;
                  return(-1);
            }
            cachesize[maxsectcache - i - 1] = n - i;
            cachewrite[maxsectcache - i - 1] = wrt;
            memcpy((char *)sectcache[maxsectcache - i - 1],
                  (char *)buf, devp -> sectsize);
            buf += devp -> sectsize;
      }

      return(0);
}

static int NEAR loadcache(devp, sect, buf, n)
CONST devstat *devp;
u_long sect;
u_char *buf;
int n;
{
      u_char *cp;
      int i, j, src, size;

      if (n <= 0) return(0);
      for (i = maxsectcache - 1; i >= 0; i -= cachesize[i]) {
            if (devp -> drive != cachedrive[i]) continue;
            if (sect >= sectno[i]
            && sect + n <= sectno[i] + cachesize[i]) {
                  src = i - (sect - sectno[i]);
                  for (j = 0; j < n; j++) {
                        memcpy((char *)buf,
                              (char *)sectcache[src - j],
                              devp -> sectsize);
                        buf += devp -> sectsize;
                  }
                  if (shiftcache(devp, i, 0) > SECTCACHESIZE) return(-1);
                  return(0);
            }
            if (sect >= sectno[i] && sect < sectno[i] + cachesize[i]) {
                  size = sectno[i] + cachesize[i] - sect;
                  src = i - (sect - sectno[i]);
                  cp = buf + (long)size * devp -> sectsize;
                  for (j = 0; j < size; j++) {
                        memcpy((char *)buf,
                              (char *)sectcache[src - j],
                              devp -> sectsize);
                        buf += devp -> sectsize;
                  }
                  if (shiftcache(devp, i, 0) > SECTCACHESIZE) return(-1);
                  return(loadcache(devp, sect + size, cp, n - size));
            }
            if (sect + n > sectno[i]
            && sect + n <= sectno[i] + cachesize[i]) {
                  size = sect + n - sectno[i];
                  src = i;
                  cp = buf + (long)(n - size) * devp -> sectsize;
                  if (loadcache(devp, sect, buf, n - size) < 0)
                        return(-1);
                  for (j = 0; j < size; j++) {
                        memcpy((char *)cp,
                              (char *)sectcache[src - j],
                              devp -> sectsize);
                        cp += devp -> sectsize;
                  }
                  if (shiftcache(devp, i, 0) > SECTCACHESIZE) return(-1);
                  return(0);
            }
            if (sect <= sectno[i]
            && sect + n >= sectno[i] + cachesize[i]) {
                  size = sectno[i] - sect;
                  src = i;
                  cp = buf + (long)size * devp -> sectsize;
                  if (loadcache(devp, sect, buf, size) < 0) return(-1);
                  for (j = 0; j < cachesize[i]; j++) {
                        memcpy((char *)cp,
                              (char *)sectcache[src - j],
                              devp -> sectsize);
                        cp += devp -> sectsize;
                  }
                  if (shiftcache(devp, i, 0) > SECTCACHESIZE) return(-1);
                  size = sect + n - sectno[i] + cachesize[i];
                  cp += (long)cachesize[i] * devp -> sectsize;
                  return(loadcache(devp, sect + size, cp, n - size) < 0);
            }
      }
      if (realread(devp, sect, buf, n) < 0) return(-1);
      savecache(devp, sect, buf, n, 0);

      return(0);
}

static long NEAR sectread(devp, sect, buf, n)
CONST devstat *devp;
u_long sect;
u_char *buf;
int n;
{
      if (loadcache(devp, sect, buf, n) < 0) return(-1);

      return((long)n * devp -> sectsize);
}

static long NEAR sectwrite(devp, sect, buf, n)
CONST devstat *devp;
u_long sect;
CONST u_char *buf;
int n;
{
      if (devp -> flags & F_RONLY) {
            doserrno = EROFS;
            return(-1);
      }
      if (savecache(devp, sect, buf, n, 1) < 0
      && realwrite(devp, sect, buf, n) < 0)
            return(-1);

      return((long)n * devp -> sectsize);
}

static int NEAR availfat(devp)
CONST devstat *devp;
{
      u_char *buf;
      u_long i, n, clust;
      int j, gap, duperrno;

      if (!needbavail || devp -> availsize != (u_long)0xffffffff)
            return(0);

      duperrno = errno;
      if (!(buf = (u_char *)malloc(devp -> sectsize))) {
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }

      if (doswaitfunc) (*doswaitfunc)();
      n = 0;
      clust = devp -> totalsize + 2;
      if (devp -> flags & F_FAT32)
      for (i = 0; i < devp -> fatsize; i++) {
            if (dosintrfunc && (*dosintrfunc)()) {
                  free(buf);
                  return(0);
            }
            if (sectread(devp, devp -> fatofs + i, buf, 1) < 0L) {
                  free(buf);
                  return(-1);
            }
            for (j = 0; j < devp -> sectsize; j += 4) {
                  if (clust) clust--;
                  else break;
                  if (!buf[j] && !buf[j + 1]
                  && !buf[j + 2] && !buf[j + 3])
                        n++;
            }
            if (!clust) break;
      }
      else if (devp -> flags & F_16BIT)
      for (i = 0; i < devp -> fatsize; i++) {
            if (dosintrfunc && (*dosintrfunc)()) {
                  free(buf);
                  return(0);
            }
            if (sectread(devp, devp -> fatofs + i, buf, 1) < 0L) {
                  free(buf);
                  return(-1);
            }
            for (j = 0; j < devp -> sectsize; j += 2) {
                  if (clust) clust--;
                  else break;
                  if (!buf[j] && !buf[j + 1]) n++;
            }
            if (!clust) break;
      }
      else for (i = gap = 0; i < devp -> fatsize; i++) {
            if (dosintrfunc && (*dosintrfunc)()) {
                  free(buf);
                  return(0);
            }
            if (sectread(devp, devp -> fatofs + i, buf, 1) < 0L) {
                  free(buf);
                  return(-1);
            }
            if ((gap & 4)) {
                  if (clust) clust--;
                  else break;
                  if (((gap & 3) == 2 && !buf[0])
                  || ((gap & 3) == 1 && !(buf[0] & 0x0f)))
                        n++;
            }
            for (j = (gap & 3); j < (devp -> sectsize - 1) * 2; j += 3) {
                  if (clust) clust--;
                  else break;
                  if (j % 2) {
                        if (!(buf[j / 2] & 0xf0) && !buf[j / 2 + 1])
                              n++;
                  }
                  else {
                        if (!buf[j / 2] && !(buf[j / 2 + 1] & 0x0f))
                              n++;
                  }
            }
            if (!clust) break;
            if (j >= devp -> sectsize * 2) gap = 0;
            else if (j % 2) gap = (buf[j / 2] & 0xf0) ? 6 : 2;
            else gap = (buf[j / 2]) ? 5 : 1;
      }

      for (i = 0; i < maxdev; i++)
            if (devlist[i].drive == devp -> drive)
                  devlist[i].availsize = n;
      free(buf);

      return(0);
}

static int NEAR readfat(devp)
devstat *devp;
{
      long size;
      int duperrno;

      duperrno = errno;
      size = (long)(devp -> fatsize) * (long)(devp -> sectsize);
      if (size > MAXFATMEM) devp -> fatbuf = NULL;
      else if ((devp -> fatbuf = (char *)malloc(size))
      && sectread(devp, devp -> fatofs,
      (u_char *)(devp -> fatbuf), devp -> fatsize) < 0L) {
            doserrno = errno;
            free(devp -> fatbuf);
            errno = duperrno;
            return(-1);
      }
      errno = duperrno;

      return(0);
}

static int NEAR writefat(devp)
CONST devstat *devp;
{
      char *buf;
      long i;
      int n;

      n = 0;
      buf = devp -> fatbuf;
      for (i = 0; i < maxdev; i++) {
            if (devlist[i].drive != devp -> drive) continue;
            n |= devlist[i].flags & F_WRFAT;
            if (!buf) buf = devlist[i].fatbuf;
            devlist[i].flags &= ~F_WRFAT;
      }
      if (!n || !buf) return(0);

      for (i = devp -> fatofs; i < devp -> dirofs; i += devp -> fatsize)
            if (sectwrite(devp, i, (u_char *)buf, devp -> fatsize) < 0L)
                  return(-1);

      return(0);
}

static long NEAR getfatofs(devp, clust)
CONST devstat *devp;
long clust;
{
      long ofs, bit;

      if (!clust) clust = devp -> rootdir;
      bit = (devp -> flags & F_FAT32)
            ? 8 : ((devp -> flags & F_16BIT) ? 4 : 3);
      ofs = (clust * bit) / 2;
      if (ofs < bit
      || ofs >= (long)(devp -> fatsize) * (long)(devp -> sectsize)) {
            doserrno = EIO;
            return(-1L);
      }

      return(ofs);
}

static u_char *NEAR readtmpfat(devp, ofs, nsect)
CONST devstat *devp;
long ofs;
int nsect;
{
      u_char *buf;
      int duperrno;

      duperrno = errno;
      if (!(buf = (u_char *)malloc((devp -> sectsize) * nsect))) {
            doserrno = errno;
            errno = duperrno;
            return(NULL);
      }
      ofs /= (devp -> sectsize);
      if (sectread(devp, (u_long)(devp -> fatofs) + ofs, buf, nsect) < 0L) {
            free(buf);
            return(NULL);
      }

      return(buf);
}

static long NEAR getfatent(devp, clust)
CONST devstat *devp;
long clust;
{
      u_char *fatp, *buf;
      long ofs;
      int nsect;

      if ((ofs = getfatofs(devp, clust)) < 0L) return(-1L);
      if ((devp -> fatbuf)) {
            buf = NULL;
            fatp = (u_char *)&(devp -> fatbuf[ofs]);
      }
      else {
            nsect = 1;
            if (!(devp -> flags & (F_16BIT | F_FAT32))
            && (ofs % devp -> sectsize) >= devp -> sectsize - 1)
                  nsect = 2;
            if (!(buf = readtmpfat(devp, ofs, nsect))) return(-1L);
            fatp = buf + (ofs % (devp -> sectsize));
      }

      if (devp -> flags & F_FAT32) {
            ofs = (*fatp & 0xff) + ((u_long)(*(fatp + 1) & 0xff) << 8)
                  + ((u_long)(*(fatp + 2) & 0xff) << 16)
                  + ((u_long)(*(fatp + 3) & 0xff) << 24);
            if (ofs >= (u_long)0x0ffffff8) ofs = ENDCLUST;
      }
      else if (devp -> flags & F_16BIT) {
            ofs = (*fatp & 0xff) + ((long)(*(fatp + 1) & 0xff) << 8);
            if (ofs >= 0x0fff8) ofs = ENDCLUST;
            else if (ofs == 0x0fff7) ofs = ERRCLUST;
      }
      else {
            if (clust % 2)
                  ofs = (((*fatp) & 0xf0) >> 4)
                        + ((long)(*(fatp + 1) & 0xff) << 4);
            else ofs = (*fatp & 0xff) + ((long)(*(fatp + 1) & 0x0f) << 8);
            if (ofs >= 0x0ff8) ofs = ENDCLUST;
            else if (ofs == 0x0ff7) ofs = ERRCLUST;
      }
      if (buf) free(buf);

      return(ofs);
}

static int NEAR putfatent(devp, clust, n)
devstat *devp;
long clust, n;
{
      u_char *fatp, *buf;
      u_long avail;
      long l, ofs;
      int i, old, nsect;

      if ((ofs = getfatofs(devp, clust)) < 0L) return(-1);
      if ((devp -> fatbuf)) {
            buf = NULL;
#ifdef      FAKEUNINIT
            nsect = 0;  /* fake for -Wuninitialized */
#endif
            fatp = (u_char *)&(devp -> fatbuf[ofs]);
      }
      else {
            nsect = 1;
            if (!(devp -> flags & (F_16BIT | F_FAT32))
            && (ofs % devp -> sectsize) >= devp -> sectsize - 1)
                  nsect = 2;
            if (!(buf = readtmpfat(devp, ofs, nsect))) return(-1);
            fatp = buf + (ofs % (devp -> sectsize));
      }
      if (devp -> flags & F_FAT32) {
            old = (*fatp || *(fatp + 1) || *(fatp + 2) || *(fatp + 3));
            *fatp = n & 0xff;
            *(fatp + 1) = (n >> 8) & 0xff;
            *(fatp + 2) = (n >> 16) & 0xff;
            *(fatp + 3) = (n >> 24) & 0xff;
      }
      else if (devp -> flags & F_16BIT) {
            old = (*fatp || *(fatp + 1));
            *fatp = n & 0xff;
            *(fatp + 1) = (n >> 8) & 0xff;
      }
      else if (clust % 2) {
            old = ((*fatp & 0xf0) || *(fatp + 1));
            *fatp &= 0x0f;
            *fatp |= (n << 4) & 0xf0;
            *(fatp + 1) = (n >> 4) & 0xff;
      }
      else {
            old = (*fatp || (*(fatp + 1) & 0x0f));
            *fatp = n & 0xff;
            *(fatp + 1) &= 0xf0;
            *(fatp + 1) |= (n >> 8) & 0x0f;
      }
      if (!buf) devp -> flags |= F_WRFAT;
      else {
            for (l = devp -> fatofs; l < devp -> dirofs;
            l += devp -> fatsize) {
                  if (sectwrite(devp, l + (ofs / (devp -> sectsize)),
                  buf, nsect) < 0L) {
                        free(buf);
                        return(-1);
                  }
            }
            free(buf);
      }

      if (devp -> availsize != (u_long)0xffffffff) {
            avail = devp -> availsize;
            if (!n && old) avail++;
            else if (n && !old && avail) avail--;
            if (avail != devp -> availsize)
                  for (i = 0; i < maxdev; i++)
                        if (devlist[i].drive == devp -> drive)
                              devlist[i].availsize = avail;
      }

      return(0);
}

static u_long NEAR clust2sect(devp, clust)
CONST devstat *devp;
long clust;
{
      u_long sect;

      if (devp -> flags & F_FAT32) {
            if (!clust) clust = devp -> rootdir;
      }
      else if (!clust || clust >= ROOTCLUST) {
            sect = (clust) ? clust - ROOTCLUST : devp -> dirofs;
            if (sect >= devp -> dirofs + (u_long)(devp -> dirsize)) {
                  doserrno = 0;
                  return((u_long)0);
            }
            return(sect);
      }

      if (clust == ENDCLUST) {
            doserrno = 0;
            return((u_long)0);
      }
      if (clust == ERRCLUST) {
            doserrno = EIO;
            return((u_long)0);
      }
      sect = ((clust - MINCLUST) * (u_long)(devp -> clustsize))
            + (devp -> dirofs + (u_long)(devp -> dirsize));

      return(sect);
}

static long NEAR clust32(devp, dentp)
CONST devstat *devp;
CONST dent_t *dentp;
{
      long clust;

      clust = (long)byte2word(dentp -> clust);
      if (devp -> flags & F_FAT32)
            clust += (long)byte2word(dentp -> clust_h) << 16;

      return(clust);
}

static long NEAR newclust(devp)
CONST devstat *devp;
{
      long clust, used;

      for (clust = MINCLUST; (used = getfatent(devp, clust)) >= 0L; clust++)
            if (!used) break;
      if (used < 0 || clust > devp -> totalsize) {
            doserrno = ENOSPC;
            return(-1L);
      }

      return(clust);
}

static long NEAR clustread(devp, buf, clust)
CONST devstat *devp;
u_char *buf;
long clust;
{
      u_long sect;
      long next;

      if (!(sect = clust2sect(devp, clust))) return(-1L);
      if (!(devp -> flags & F_FAT32)
      && sect < devp -> dirofs + (u_long)(devp -> dirsize))
            next = ROOTCLUST + sect + (long)(devp -> clustsize);
      else next = getfatent(devp, clust);

      if (buf && sectread(devp, sect, buf, devp -> clustsize) < 0L)
            return(-1L);

      return(next);
}

static long NEAR clustwrite(devp, buf, prev)
devstat *devp;
CONST u_char *buf;
long prev;
{
      u_long sect;
      long clust;

      if ((clust = newclust(devp)) < 0L) return(-1L);
      if (!(sect = clust2sect(devp, clust))) {
            doserrno = EIO;
            return(-1L);
      }
      if (buf && sectwrite(devp, sect, buf, devp -> clustsize) < 0L)
            return(-1L);

      if ((prev && putfatent(devp, prev, clust) < 0)
      || putfatent(devp, clust, ENDCLUST) < 0) return(-1L);

      return(clust);
}

static long NEAR clustexpand(devp, clust, fill)
devstat *devp;
long clust;
int fill;
{
      u_char *buf;
      long n, new, size;
      int duperrno;

      if (!fill) buf = NULL;
      else {
            duperrno = errno;
            size = (long)(devp -> clustsize) * (long)(devp -> sectsize);
            if (!(buf = (u_char *)malloc(size))) {
                  doserrno = errno;
                  errno = duperrno;
                  return(-1L);
            }
            for (n = 0; n < size; n++) buf[n] = 0;
      }
      new = clustwrite(devp, buf, clust);
      if (buf) free(buf);

      return(new);
}

static int NEAR clustfree(devp, clust)
devstat *devp;
long clust;
{
      long next;

      if (clust) for (;;) {
            next = getfatent(devp, clust);
            if (next < 0L || putfatent(devp, clust, 0) < 0) return(-1);
            if (next == ENDCLUST || next == ERRCLUST) break;
            clust = next;
      }

      return(0);
}

#if   MSDOS
static int NEAR readbpb(devp, drv)
devstat *devp;
int drv;
#else
static int NEAR _readbpb(devp, bpbcache)
devstat *devp;
CONST bpb_t *bpbcache;
#endif
{
#if   !MSDOS
      int i, cc, fd, nh, ns, nsect;
#endif
#ifdef      LINUX
      struct stat st1, st2;
      struct mntent *mntp;
      FILE *fp;
#endif
      CONST bpb_t *bpb;
      char *buf;
      long total;
      int duperrno;

      duperrno = errno;
#if   MSDOS
      if (!(buf = (char *)malloc(MAXSECTSIZE))) {
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }
      bpb = (bpb_t *)buf;
      if (rawdiskio(drv, 0, (u_char *)buf, 1, MAXSECTSIZE, 0) < 0) {
            doserrno = errno;
            free(buf);
            errno = duperrno;
            return(-1);
      }
      memset((char *)devp, 0, sizeof(*devp));
      devp -> drive = drv;
#else /* !MSDOS */
      buf = NULL;
      if (!(devp -> ch_head) || !(nsect = devp -> ch_sect)) return(0);

# ifdef     HDDMOUNT
      if (!(devp -> ch_cyl));
      else
# endif
      if (nsect <= 100) devp -> flags &= ~F_8SECT;
      else {
            nsect %= 100;
            devp -> flags |= F_8SECT;
      }

      if (bpbcache -> nfat) bpb = bpbcache;
      else {
            devp -> fd = -1;
            i = (O_BINARY | O_RDWR);
# ifdef     HDDMOUNT
            if (!(devp -> ch_cyl) && toupper2(devp -> ch_head) != 'W') {
                  i = (O_BINARY | O_RDONLY);
                  devp -> flags |= F_RONLY;
            }
# endif
# ifdef     LINUX
            if (i == (O_BINARY | O_RDWR)) {
                  if (stat(devp -> ch_name, &st1)) {
                        doserrno = errno;
                        errno = duperrno;
                        return(-1);
                  }
                  if ((fp = setmntent(MOUNTED, "r"))) {
                        while ((mntp = getmntent(fp))) {
#  if 1
                              if (strstr(mntp -> mnt_opts, "ro"))
                                    continue;
#  endif
                              if (stat(mntp -> mnt_fsname, &st2))
                                    continue;
                              if (st1.st_ino == st2.st_ino) {
                                    i = (O_BINARY | O_RDONLY);
                                    devp -> flags |= F_RONLY;
                                    break;
                              }
                        }
                        endmntent(fp);
                  }
            }
# endif     /* LINUX */
            if ((fd = open(devp -> ch_name, i, 0666)) < 0) {
# ifdef     EFORMAT
                  if (errno == EFORMAT) {
                        errno = duperrno;
                        return(0);
                  }
# endif
                  if (errno == EIO) errno = ENODEV;
                  if ((errno != EROFS && errno != EACCES)
                  || i == (O_BINARY | O_RDONLY)
                  || (fd = open(devp -> ch_name,
                  O_BINARY | O_RDONLY, 0666)) < 0) {
                        doserrno = errno;
                        errno = duperrno;
                        return(-1);
                  }
                  devp -> flags |= F_RONLY;
            }
# if  defined (LINUX) && defined (BLKFLSBUF)
            VOID_C ioctl(fd, BLKFLSBUF, 0);
# endif

            cc = 0;
            for (i = 0; i < SLISTSIZ; i++)
                  if (cc < sectsizelist[i]) cc = sectsizelist[i];
            if (!(buf = (char *)malloc(cc))) {
                  close(fd);
                  doserrno = errno;
                  errno = duperrno;
                  return(-1);
            }
            for (i = 0; i < SLISTSIZ; i++) {
# ifdef     HDDMOUNT
                  if (Xllseek(fd, devp -> offset, L_SET) < (l_off_t)0)
# else
                  if (Xllseek(fd, (l_off_t)0, L_SET) < (l_off_t)0)
# endif
                  {
                        i = SLISTSIZ;
                        break;
                  }
                  while ((cc = read(fd, buf, sectsizelist[i])) < 0) {
                        if (dosintrfunc && (*dosintrfunc)()) {
                              close(fd);
                              doserrno = EINTR;
                              errno = duperrno;
                              return(-1);
                        }
                        if (errno != EINTR) break;
                  }
                  if (cc >= 0) break;
            }
            if (i >= SLISTSIZ) {
                  close(fd);
                  free(buf);
                  errno = duperrno;
                  return(0);
            }
            bpb = (bpb_t *)buf;
            devp -> fd = newdup(fd);
      }
#endif      /* !MSDOS */

      total = byte2word(bpb -> total);
      if (!total) total = byte2dword(bpb -> bigtotal);
#if   !MSDOS
# ifdef     HDDMOUNT
      if (devp -> ch_cyl)
# endif
      {
            nh = byte2word(bpb -> nhead);
            ns = byte2word(bpb -> secttrack);
            if (!nh || !ns || nh != devp -> ch_head || ns != nsect
            || (total + (nh * ns / 2)) / (nh * ns) != devp -> ch_cyl) {
                  if (bpb != bpbcache)
                        memcpy((char *)bpbcache,
                              (char *)bpb, sizeof(*bpbcache));
                  if (buf) free(buf);
                  errno = duperrno;
                  return(0);
            }
      }
#endif      /* !MSDOS */

      devp -> clustsize = bpb -> clustsize;
      devp -> sectsize = byte2word(bpb -> sectsize);
      if (!(devp -> clustsize) || !(devp -> sectsize)) {
            if (buf) free(buf);
            errno = duperrno;
            return(-1);
      }

      devp -> fatofs = byte2word(bpb -> bootsect);
      devp -> fatsize = byte2word(bpb -> fatsize);
      devp -> dirsize = (u_long)byte2word(bpb -> maxdir) * DOSDIRENT
            / (u_long)(devp -> sectsize);

      if (devp -> fatsize && devp -> dirsize) devp -> rootdir = 0L;
      else {
            if (!(devp -> fatsize))
                  devp -> fatsize = byte2dword(bpb -> bigfatsize);
            devp -> dirsize = 0;
            devp -> rootdir = byte2dword(bpb -> rootdir);
            devp -> flags |= F_FAT32;
      }

      devp -> dirofs = devp -> fatofs + (devp -> fatsize * bpb -> nfat);
      total -= devp -> dirofs + (u_long)(devp -> dirsize);
      devp -> totalsize = total / (devp -> clustsize);
      devp -> availsize = (u_long)0xffffffff;

      if (!(devp -> flags & F_FAT32)) {
            if (!strsizecmp(bpb -> fsname, FS_FAT)
            || !strsizecmp(bpb -> fsname, FS_FAT12))
                  devp -> flags &= ~F_16BIT;
            else if (!strsizecmp(bpb -> fsname, FS_FAT16)
            || devp -> totalsize > MAX12BIT)
                  devp -> flags |= F_16BIT;
      }

      if (buf) free(buf);
      errno = duperrno;

      return(1);
}

#if   !MSDOS
static int NEAR readbpb(devp, drv)
devstat *devp;
int drv;
{
      bpb_t bpb;
      CONST char *cp;
      int i, n;

      cp = NULL;
      devp -> fd = -1;
      for (i = 0; i < maxfdtype; i++) {
            if (drv != (int)fdtype[i].drive) continue;
            if (!cp || strcmp(cp, fdtype[i].name)) {
                  bpb.nfat = 0;
                  if ((devp -> fd) >= 0) close(devp -> fd);
                  memset((char *)devp, 0, sizeof(*devp));
                  devp -> fd = -1;
            }
            memcpy((char *)devp, (char *)&(fdtype[i]), sizeof(*fdtype));
            cp = fdtype[i].name;
            if ((n = _readbpb(devp, &bpb)) < 0) return(-1);
            if (n > 0) break;
      }
      if (i >= maxfdtype) {
            if ((devp -> fd) >= 0) close(devp -> fd);
            doserrno = ENODEV;
            return(-1);
      }

      return(0);
}
#endif      /* !MSDOS */

#ifdef      HDDMOUNT
static l_off_t *NEAR _readpt(offset, extoffset, fd, head, sect, secsiz)
l_off_t offset, extoffset;
int fd, head, sect, secsiz;
{
      partition_t *pt;
      partition98_t *pt98;
      u_char *cp, *buf;
      l_off_t ofs, *sp, *tmp, *slice;
      int i, n, nslice, pofs, ps, pn, beg, siz;

      if (head) {
            ps = PART98_SIZE;
            pofs = PART98_TABLE;
            pn = PART98_NUM;
      }
      else {
            ps = PART_SIZE;
            pofs = PART_TABLE;
            pn = PART_NUM;
      }

      beg = (pofs / DEV_BSIZE) * DEV_BSIZE;
      siz = ((pofs + ps * pn - 1) / DEV_BSIZE + 1) * DEV_BSIZE - beg;

      if (!(slice = (l_off_t *)malloc(2 * sizeof(l_off_t)))) return(NULL);
      slice[nslice = 0] = (l_off_t)secsiz;
      slice[++nslice] = (l_off_t)0;

      if (Xllseek(fd, offset + beg, L_SET) < (l_off_t)0) return(slice);
      if (!(buf = (u_char *)malloc(siz))) {
            free(slice);
            return(NULL);
      }

      while ((i = read(fd, buf, siz)) < 0 && errno == EINTR);
      if (i < 0
      || (!head && (buf[siz - 2] != 0x55 || buf[siz - 1] != 0xaa))) {
            free(buf);
            return(slice);
      }
      cp = &(buf[pofs - beg]);

      for (i = 0; i < pn; i++, cp += ps) {
            if (head) {
                  pt98 = (partition98_t *)cp;
                  if (pt98 -> filesys != PT98_FAT12
                  && pt98 -> filesys != PT98_FAT16
                  && pt98 -> filesys != PT98_FAT16X
                  && pt98 -> filesys != PT98_FAT32)
                        continue;
                  ofs = byte2word(pt98 -> s_cyl);
                  ofs = ofs * head + pt98 -> s_head;
                  ofs = ofs * sect + pt98 -> s_sect;
                  ofs *= secsiz;
            }
            else {
                  pt = (partition_t *)cp;
                  ofs = byte2dword(pt -> f_sect);
                  ofs *= secsiz;
                  if (pt -> filesys == PT_EXTEND
                  || pt -> filesys == PT_EXTENDLBA) {
                        if (extoffset) ofs += extoffset;
                        else extoffset = ofs;

                        sp = _readpt(ofs, extoffset, fd, 0, 0, secsiz);
                        if (!sp) {
                              free(buf);
                              free(slice);
                              return(NULL);
                        }
                        for (n = 0; sp[n + 1]; n++) /*EMPTY*/;
                        if (!n) {
                              free(sp);
                              continue;
                        }

                        siz = (nslice + n + 1) * sizeof(l_off_t);
                        if (!(tmp = (l_off_t *)realloc(slice, siz))) {
                              free(buf);
                              free(slice);
                              free(sp);
                              return(NULL);
                        }
                        slice = tmp;

                        memcpy((char *)&(slice[nslice]),
                              (char *)&(sp[1]), n * sizeof(l_off_t));
                        slice[nslice += n] = (l_off_t)0;
                        free(sp);
                        continue;
                  }
                  else if (pt -> filesys != PT_FAT12
                  && pt -> filesys != PT_FAT16
                  && pt -> filesys != PT_FAT16X
                  && pt -> filesys != PT_FAT32
                  && pt -> filesys != PT_FAT32LBA
                  && pt -> filesys != PT_FAT16XLBA)
                        continue;

                  ofs += offset;
            }

            siz = (nslice + 1 + 1) * sizeof(l_off_t);
            if (!(tmp = (l_off_t *)realloc(slice, siz))) {
                  free(buf);
                  free(slice);
                  return(NULL);
            }
            slice = tmp;
            slice[nslice++] = ofs;
            slice[nslice] = (l_off_t)0;
      }
      free(buf);

      return(slice);
}

l_off_t *readpt(devfile, pc98)
CONST char *devfile;
int pc98;
{
# ifdef     DIOCGDINFO
      struct disklabel dl;
      l_off_t *slice;
      int fd, head, sect, size;
# endif
# ifdef     SOLARIS
      struct vtoc toc;
# endif

# ifdef     DIOCGDINFO
      if ((fd = open(devfile, O_BINARY | O_RDONLY, 0666)) < 0) {
            if (errno == EIO) errno = ENODEV;
            return(NULL);
      }

      /* hack for disk initialize */
      read(fd, &head, sizeof(head));

      head = sect = 0;
      if (ioctl(fd, DIOCGDINFO, &dl) < 0) {
            close(fd);
            return(NULL);
      }
      if (pc98) {
            head = dl.d_ntracks;
            sect = dl.d_nsectors;
      }

#  ifdef    SOLARIS
      {
            if (ioctl(fd, DKIOCGVTOC, &toc) < 0) {
                  close(fd);
                  return(NULL);
            }
            size = toc.v_sectorsz;
      }
#  else
      size = D_SECSIZE(dl);
#  endif
      slice = _readpt((l_off_t)0, (l_off_t)0, fd, head, sect, size);

      close(fd);

      return(slice);
# else      /* !DIOCGDINFO */
      errno = ENODEV;

      return(NULL);
# endif     /* !DIOCGDINFO */
}
#endif      /* HDDMOUNT */

static int NEAR _dosopendev(drive)
int drive;
{
      devstat dev;
      int i, new, drv;

      if (!drive) {
            doserrno = ENODEV;
            return(-1);
      }
      for (new = 0; new < maxdev; new++) if (!(devlist[new].drive)) break;
      if (new >= DOSNOFILE || maxorder >= DOSNOFILE) {
            doserrno = EMFILE;
            return(-1);
      }
      drv = toupper2(drive);

      for (i = maxorder - 1; i >= 0; i--)
            if (drv == (int)devlist[devorder[i]].drive) break;
      if (i >= 0) {
            memcpy((char *)&dev,
                  (char *)&(devlist[devorder[i]]), sizeof(dev));
            dev.flags |= F_DUPL;
            dev.flags &= ~(F_CACHE | F_WRFAT);
      }
      else {
            if (readbpb(&dev, drv) < 0) return(-1);
            dev.dircache = NULL;
            if (readfat(&dev) < 0) {
#if   !MSDOS
                  close(dev.fd);
#endif
                  return(-1);
            }
      }
      if (islower2(drive)) dev.flags |= F_VFAT;
      else dev.flags &= ~F_VFAT;

      memcpy((char *)&(devlist[new]), (char *)&dev, sizeof(*devlist));
      devlist[new].nlink = 1;
      if (new >= maxdev) maxdev++;
      devorder[maxorder++] = new;

      return(new);
}

static int NEAR _dosclosedev(dd)
int dd;
{
      int i, n, duperrno;

      if (dd < 0 || dd >= maxdev || !devlist[dd].drive) {
            doserrno = EBADF;
            return(-1);
      }

      if (devlist[dd].nlink > 0) devlist[dd].nlink--;
      if (devlist[dd].nlink > 0) return(0);

      duperrno = errno;
      n = 0;
      if (!(devlist[dd].flags & F_DUPL)) {
            for (i = 0; i < maxdev; i++)
                  if (i != dd && devlist[i].drive == devlist[dd].drive
                  && (devlist[i].flags & F_DUPL))
                        break;
            if (i < maxdev) {
                  devlist[i].flags &= ~F_DUPL;
                  if ((devlist[dd].flags & F_CACHE)
                  && !(devlist[i].flags & F_CACHE)) {
                        devlist[i].dircache = devlist[dd].dircache;
                        devlist[i].flags |= F_CACHE;
                        devlist[dd].flags &= ~F_CACHE;
                  }
                  devlist[i].flags |= (devlist[dd].flags & F_WRFAT);

                  devlist[dd].flags |= F_DUPL;
                  devlist[dd].flags &= ~F_WRFAT;
            }
      }

      if (writefat(&(devlist[dd])) < 0) n = -1;
      if (devlist[dd].flags & F_CACHE) free(devlist[dd].dircache);

      if (devlist[dd].flags & F_DUPL) flushcache(&(devlist[dd]));
      else {
            for (i = maxsectcache - 1; i >= 0; i -= cachesize[i]) {
                  if (cachedrive[i] == devlist[dd].drive
                  && shiftcache(&(devlist[dd]), i, -1) > SECTCACHESIZE)
                        n = -1;
            }
            if (devlist[dd].fatbuf) free(devlist[dd].fatbuf);
#if   !MSDOS
            close(devlist[dd].fd);
#endif
      }

      for (i = maxorder - 1; i >= 0; i--) if (devorder[i] == dd) break;
      if (i >= 0) memmove((char *)&(devorder[i]),
            (char *)&(devorder[i + 1]),
            (--maxorder - i) * sizeof(*devorder));

      devlist[dd].drive = '\0';
      while (maxdev > 0 && !devlist[maxdev - 1].drive) maxdev--;
      errno = duperrno;

      return(n);
}

int dosopendev(drive)
int drive;
{
      int i, drv;

      drv = toupper2(drive);
      for (i = maxdev - 1; i >= 0; i--)
            if (drv == (int)devlist[i].drive) break;
      if (i >= 0) {
            devlist[i].nlink++;
            return(i);
      }

      if (doswaitfunc) (*doswaitfunc)();
      if ((i = _dosopendev(drive)) < 0) return(seterrno(doserrno));

      return(i);
}

VOID dosclosedev(dd)
int dd;
{
      int duperrno;

      duperrno = errno;
      VOID_C _dosclosedev(dd);
      errno = duperrno;
}

int flushdrv(drive, func)
int drive;
VOID_T (*func)__P_((VOID_A));
{
      devstat dev;
      u_long avail;
      int i, n, dd, drv, duperrno;

      drv = toupper2(drive);
      duperrno = errno;
      n = 0;
      dd = -1;
      for (i = maxorder - 1; i >= 0; i--) {
            if (drv != (int)devlist[devorder[i]].drive) continue;
            if (writefat(&(devlist[devorder[i]])) < 0) {
                  duperrno = doserrno;
                  n = -1;
            }
            if (!(devlist[devorder[i]].flags & F_DUPL)) dd = devorder[i];
            if (devlist[devorder[i]].flags & F_CACHE) {
                  free(devlist[devorder[i]].dircache);
                  devlist[devorder[i]].dircache = NULL;
                  devlist[devorder[i]].flags &= ~F_CACHE;
            }
      }
      if (dd < 0) {
            if (func) (*func)();
            errno = duperrno;
            return(n);
      }

      for (i = maxsectcache - 1; i >= 0; i -= cachesize[i]) {
            if (drv != cachedrive[i]) continue;
            if (shiftcache(&(devlist[dd]), i, -1) > SECTCACHESIZE) {
                  duperrno = doserrno;
                  n = -1;
            }
      }
      if (devlist[dd].fatbuf) free(devlist[dd].fatbuf);
      if (devlist[dd].dircache) free(devlist[dd].dircache);
      avail = devlist[dd].availsize;
#if   !MSDOS
      close(devlist[dd].fd);
#endif
      if (func) (*func)();
#if   !MSDOS
      sync();
      sync();
#endif
      if (readbpb(&dev, drv) < 0) {
            duperrno = doserrno;
            n = -1;
      }
      else {
            dev.dircache = NULL;
            dev.availsize = avail;
            if (readfat(&dev) < 0) {
#if   !MSDOS
                  close(dev.fd);
#endif
                  return(-1);
            }
      }
      if (islower2(drive)) dev.flags |= F_VFAT;
      else dev.flags &= ~F_VFAT;

      memcpy((char *)&(devlist[dd]), (char *)&dev, sizeof(*devlist));
      errno = duperrno;

      return(n);
}

static int NEAR calcsum(name)
CONST u_char *name;
{
      int i, sum;

      for (i = sum = 0; i < 8 + 3; i++) {
            sum = (((sum & 0x01) << 7) | ((sum & 0xfe) >> 1));
            sum += name[i];
      }

      return(sum & 0xff);
}

static u_int NEAR lfnencode(c1, c2)
u_int c1, c2;
{
      c1 &= 0xff;
      c2 &= 0xff;
#if   MSDOS
      if (!c1 && (c2 < ' ' || strchr2(NOTINLFN, c2))) return(0xffff);
#else
      if (!c1 && (c2 < ' ' || strchr2(NOTINLFN, c2))) return('_');
#endif

      return(cnvunicode((c1 << 8) | c2, 1));
}

static u_int NEAR lfndecode(c1, c2)
u_int c1, c2;
{
      c1 &= 0xff;
      c2 &= 0xff;

      return(cnvunicode((c1 << 8) | c2, 0));
}

#if   !MSDOS
static int NEAR transchar(c)
int c;
{
      if (c == '+') return('`');
      if (c == ',') return('\'');
      if (c == '[') return('&');
      if (c == '.') return('$');

      return('\0');
}

static int NEAR detranschar(c)
int c;
{
      if (c == '`') return('+');
      if (c == '\'') return(',');
      if (c == '&') return('[');
      if (c == '$') return('.');

      return('\0');
}
#endif      /* !MSDOS */

static int NEAR sfntranschar(c)
int c;
{
      if ((u_char)c < ' ' || strchr2(NOTINLFN, c)) return(-2);
      if (strchr2(NOTINALIAS, c)) return(-1);
      if (strchr2(PACKINALIAS, c)) return(0);

      return(toupper2(c));
}

static int NEAR cmpdospath(path1, path2, len, part)
CONST char *path1, *path2;
int len, part;
{
      CONST char *cp;
      u_int w1, w2;
      int i, c1, c2;

      if (len < 0) len = strlen(path1);
      if ((cp = strrdelim(path1, 1))) cp++;
      else cp = path1;

      if (!isdotdir(cp))
            while (len > 0 && strchr2(PACKINALIAS, path1[len - 1])) len--;
      for (i = 0; i < len; i++) {
            c1 = (u_char)(path1[i]);
            c2 = (u_char)(path2[i]);
            if (!issjis1(c1) || !issjis2(c2)) {
                  if (!c1 || !c2 || toupper2(c1) != toupper2(c2))
                        return(c1 - c2);
            }
            else {
                  if (++i >= len) return(-path2[i]);
                  if (!path1[i] || !path2[i])
                        return(path1[i] - path2[i]);

                  w1 = unifysjis((c1 << 8) | (u_char)(path1[i]), 0);
                  w2 = unifysjis((c2 << 8) | (u_char)(path2[i]), 0);
                  if (w1 != w2) return(w1 - w2);
            }
      }
      if (!path2[i]) return(0);
      else if (part && path2[i] == _SC_) return(0);

      return(-path2[i]);
}

static char *NEAR getdosname(buf, name, ext)
char *buf;
CONST u_char *name, *ext;
{
      int i, len;

      for (i = 0; i < 8 && name[i] != ' '; i++) buf[i] = name[i];
      len = i;
      if (*ext != ' ') {
            buf[len++] = '.';
            for (i = 0; i < 3 && ext[i] != ' '; i++) buf[len + i] = ext[i];
            len += i;
      }
      buf[len] = '\0';
      if (buf[0] == 0x05) ((u_char *)buf)[0] = 0xe5;

      return(buf);
}

static u_char *NEAR putdosname(buf, file, vol)
u_char *buf;
CONST char *file;
int vol;
{
      CONST char *cp, *eol;
      char num[7];
      u_int w;
      int i, j, c, cnv;

      if (isdotdir(file)) {
            strcpy2((char *)buf, file);
            return(buf);
      }

      for (i = strlen(file); i > 0; i--)
            if (!strchr2(PACKINALIAS, file[i - 1])) break;
      if (i <= 0) return(NULL);
      eol = &(file[i]);
      for (cp = eol - 1; cp > file; cp--) if (*cp == '.') break;
      if (cp <= file) cp = NULL;

      cnv = 0;
      for (i = 0; i < 8; i++) {
            if (file == cp || file == eol || !*file) buf[i] = ' ';
            else if (issjis1(*file) && issjis2(file[1])) {
                  w = ((u_int)(*file) << 8) | (u_char)(file[1]);
                  w = unifysjis(w, vol);
                  buf[i++] = (w >> 8) & 0xff;
                  buf[i] = w & 0xff;
                  file += 2;
            }
#if   !MSDOS
            else if (!vol && (c = transchar(*file)) > 0) {
                  buf[i] = c;
                  file++;
            }
#endif
            else {
                  if ((c = sfntranschar(*(file++))) > 0) buf[i] = c;
#if   MSDOS
                  else if (c < -1) {
                        dependdosfunc = 1;
                        return(NULL);
                  }
#endif
                  else {
                        cnv = 1;
                        if (!c) i--;
                        else buf[i] = '_';
                  }
            }
      }

      if (file != cp && file < eol && *file) cnv = 1;
      if (cp) cp++;
      for (i = 8; i < 11; i++) {
            if (!cp || cp == eol || !*cp) buf[i] = ' ';
            else if (issjis1(*cp) && issjis2(cp[1])) {
                  buf[i++] = *((u_char *)(cp++));
                  buf[i] = *((u_char *)(cp++));
            }
#if   !MSDOS
            else if (!vol && (c = transchar(*cp)) > 0) {
                  buf[i] = c;
                  cp++;
            }
#endif
            else {
                  if ((c = sfntranschar(*(cp++))) > 0) buf[i] = c;
#if   MSDOS
                  else if (c < -1) {
                        dependdosfunc = 1;
                        return(NULL);
                  }
#endif
                  else {
                        cnv = 1;
                        if (!c) i--;
                        else buf[i] = '_';
                  }
            }
      }
      if (cp && cp < eol && *cp) cnv = 1;
      buf[i] = '\0';

      if (vol > 1 || (vol > 0 && cnv)) {
            for (j = 0; j < arraysize(num); j++) {
                  if (!vol) break;
                  num[j] = (vol % 10) + '0';
                  vol /= 10;
            }
            for (i = arraysize(num) - j; i > 0; i--)
                  if (buf[i - 1] != ' ') break;
            buf[i++] = '~';
            while (j-- > 0) buf[i++] = num[j];
      }
      if (buf[0] == 0xe5) buf[0] = 0x05;

      return(buf);
}

static u_int NEAR getdosmode(attr)
u_int attr;
{
      u_int mode;

      mode = 0;
      if (!(attr & DS_IHIDDEN)) mode |= S_IRUSR;
      if (!(attr & DS_IRDONLY)) mode |= S_IWUSR;
      mode |= (mode >> 3) | (mode >> 6);
#if   MSDOS
      if (attr & DS_IARCHIVE) mode |= S_ISVTX;
#endif
      if (attr & DS_IFDIR) mode |= (S_IFDIR | S_IEXEC_ALL);
      else if (attr & DS_IFLABEL) mode |= S_IFIFO;
      else if (attr & DS_IFSYSTEM) mode |= S_IFSOCK;
      else mode |= S_IFREG;

      return(mode);
}

static u_int NEAR putdosmode(mode)
u_int mode;
{
      u_int attr;

      attr = 0;
#if   MSDOS
      if (mode & S_ISVTX) attr |= DS_IARCHIVE;
#endif
      if (!(mode & S_IRUSR)) attr |= DS_IHIDDEN;
      if (!(mode & S_IWUSR)) attr |= DS_IRDONLY;
      if ((mode & S_IFMT) == S_IFDIR) attr |= DS_IFDIR;
      else {
#if   !MSDOS
            attr |= DS_IARCHIVE;
#endif
            if ((mode & S_IFMT) == S_IFIFO) attr |= DS_IFLABEL;
            else if ((mode & S_IFMT) == S_IFSOCK) attr |= DS_IFSYSTEM;
      }

      return(attr);
}

static time_t NEAR getdostime(d, t)
u_int d, t;
{
      struct tm tm;

      tm.tm_year = 1980 + ((d >> 9) & 0x7f);
      tm.tm_year -= 1900;
      tm.tm_mon = ((d >> 5) & 0x0f) - 1;
      tm.tm_mday = (d & 0x1f);
      tm.tm_hour = ((t >> 11) & 0x1f);
      tm.tm_min = ((t >> 5) & 0x3f);
      tm.tm_sec = ((t << 1) & 0x3e);

      return(timelocal2(&tm));
}

static int NEAR putdostime(buf, tim)
u_char *buf;
time_t tim;
{
#if   MSDOS
      struct timeb buffer;
#else
      struct timeval t_val;
      struct timezone tz;
#endif
      struct tm *tm;
      time_t tmp;
      u_int d, t;
      int mt;

      if (tim != (time_t)-1) {
            tmp = tim;
            mt = 0;
      }
      else {
#if   MSDOS
            ftime(&buffer);
            tmp = (time_t)(buffer.time);
            mt = (int)(buffer.millitm);
#else
            gettimeofday2(&t_val, &tz);
            tmp = (time_t)(t_val.tv_sec);
            mt = (int)(t_val.tv_usec / 1000);
#endif
      }
      tm = localtime(&tmp);
      d = (((tm -> tm_year - 80) & 0x7f) << 9)
            + (((tm -> tm_mon + 1) & 0x0f) << 5)
            + (tm -> tm_mday & 0x1f);
      t = ((tm -> tm_hour & 0x1f) << 11)
            + ((tm -> tm_min & 0x3f) << 5)
            + ((tm -> tm_sec & 0x3e) >> 1);

      if (!t && tim == (time_t)-1) t = 0x0001;
      buf[0] = t & 0xff;
      buf[1] = (t >> 8) & 0xff;
      buf[2] = d & 0xff;
      buf[3] = (d >> 8) & 0xff;

      return(mt);
}

static int NEAR getdrive(path)
CONST char *path;
{
      int i, drive;

      if (!(drive = __dospath(path))) {
            doserrno = ENOENT;
            return(-1);
      }

      if (lastdrive < 0) {
            for (i = 0; i < 'Z' - 'A' + 1; i++) curdir[i] = NULL;
            lastdrive = drive;
      }

      return(drive);
}

static char *NEAR addpath(buf, ptr, path, len)
char *buf;
int ptr;
CONST char *path;
int len;
{
      char *cp;

      cp = &(buf[ptr]);
      if (len && path[len - 1] == '.') len--;
      if (ptr + 1 + len >= DOSMAXPATHLEN - 2 - 1) {
            doserrno = ENAMETOOLONG;
            return(NULL);
      }
      *(cp++) = _SC_;
      memcpy(cp, path, len);
      cp += len;

      return(cp);
}

static int NEAR parsepath(buf, path, class)
char *buf;
CONST char *path;
int class;
{
      char *cp;
      int i, drv, drive;

      cp = buf;
      if ((drive = getdrive(path)) < 0) return(-1);
      drv = toupper2(drive) - 'A';
      path += 2;
#if   MSDOS
      if (*path != '/' && *path != '\\') {
            *buf = _SC_;
            if (checkdrive(drv) <= 0) {
                  if (!unixgetcurdir(&(buf[1]), drv + 1)) buf[1] = '\0';
            }
            else if (curdir[drv]) strcpy2(&(buf[1]), curdir[drv]);
            else *buf = '\0';
#else
      if (*path != '/' && *path != '\\' && curdir[drv] && *(curdir[drv])) {
            *buf = _SC_;
            strcpy2(&(buf[1]), curdir[drv]);
#endif
            cp += strlen(buf);
      }

      while (*path) {
            for (i = 0; path[i] && path[i] != '/' && path[i] != '\\'; i++)
                  if (issjis1(path[i]) && issjis2(path[i + 1])) i++;
            if (class && !path[i]) {
                  if ((i == 1 && path[0] == '.')
                  || (i == 2 && path[0] == '.' && path[1] == '.')) {
                        *(cp++) = _SC_;
                        memcpy(cp, path, i);
                        cp += i;
                  }
                  else if (!(cp = addpath(buf, cp - buf, path, i)))
                        return(-1);
            }
            else if (!i || (i == 1 && path[0] == '.')) /*EMPTY*/;
            else if (i == 2 && path[0] == '.' && path[1] == '.') {
                  cp = strrdelim2(buf, cp);
                  if (!cp) cp = buf;
            }
            else if (!(cp = addpath(buf, cp - buf, path, i))) return(-1);
            if (*(path += i)) path++;
      }
      if (cp == buf) *(cp++) = _SC_;
      else if (isdelim(buf, cp - 1 - buf)) cp--;
      *cp = '\0';

      return(drive);
}

static dosDIR *NEAR _dosopendir(path, resolved, needlfn)
CONST char *path;
char *resolved;
int needlfn;
{
      dosDIR *xdirp;
      struct dosdirent *dp;
      dent_t *dentp;
      cache_t *cache;
      CONST char *cp;
      char *cachepath, name[8 + 1 + 3 + 1], buf[DOSMAXPATHLEN - 2];
      int len, dd, drive, flen, rlen, duperrno;

      rlen = 0;
      duperrno = errno;
      if ((drive = parsepath(buf, path, 0)) < 0
      || (dd = _dosopendev(drive)) < 0)
            return(NULL);

      path = buf + 1;
      if (!devlist[dd].dircache) {
            cache = NULL;
            cp = NULL;
      }
      else {
            cache = devlist[dd].dircache;
            cp = cache -> path;
      }
      if (!(devlist[dd].dircache = (cache_t *)malloc(sizeof(cache_t)))) {
            dosclosedev(dd);
            doserrno = errno;
            errno = duperrno;
            return(NULL);
      }
      devlist[dd].flags |= F_CACHE;
      cachepath = dd2path(dd);

      if (!(xdirp = (dosDIR *)malloc(sizeof(dosDIR)))) {
            dosclosedev(dd);
            doserrno = errno;
            errno = duperrno;
            return(NULL);
      }
      xdirp -> dd_id = DID_IFDOSDRIVE;
      xdirp -> dd_fd = dd;
      xdirp -> dd_top = xdirp -> dd_off = 0L;
      xdirp -> dd_loc = 0L;
      xdirp -> dd_size = (long)(devlist[dd].clustsize)
            * (long)(devlist[dd].sectsize);
      if (!(xdirp -> dd_buf = (char *)malloc(xdirp -> dd_size))) {
            _dosclosedir(xdirp);
            doserrno = errno;
            errno = duperrno;
            return(NULL);
      }

      if (resolved) rlen = gendospath(resolved, drive, _SC_) - resolved;

      if (cp && (len = strlen(cp)) > 0) {
            if (isdelim(cp, len - 1)) len--;
            if (!cmpdospath(cp, path, len, 1)) {
                  xdirp -> dd_top = xdirp -> dd_off =
                        clust32(&(devlist[dd]), &(cache -> dent));
                  memcpy((char *)devlist[dd].dircache,
                        (char *)cache, sizeof(*cache));
                  cachepath += len;
                  *(cachepath++) = _SC_;
                  path += len;
                  if (*path) path++;
                  if (resolved) {
                        if (rlen > 3) resolved[rlen++] = _SC_;
                        memcpy(&(resolved[rlen]), cp, len);
                        rlen += len;
                        resolved[rlen] = '\0';
                  }
            }
      }
      *cachepath = '\0';

      while (*path) {
            cp = path;
            if ((path = strdelim(path, 0))) len = (path++) - cp;
            else {
                  len = strlen(cp);
                  path = cp + len;
            }
            if (!len || (len == 1 && *cp == '.')) continue;

            if (!(dp = finddirent(xdirp, cp, len, needlfn))) {
                  errno = (doserrno) ? doserrno : ENOENT;
                  _dosclosedir(xdirp);
                  doserrno = errno;
                  errno = duperrno;
                  return(NULL);
            }
            if (resolved) {
                  if (needlfn) cp = dp -> d_name;
                  else {
                        getdosname(name,
                              dd2dentp(xdirp -> dd_fd) -> name,
                              dd2dentp(xdirp -> dd_fd) -> ext);
                        cp = name;
                  }
                  flen = strlen(cp);
                  if (rlen + 1 + flen >= DOSMAXPATHLEN) {
                        _dosclosedir(xdirp);
                        doserrno = ENAMETOOLONG;
                        errno = duperrno;
                        return(NULL);
                  }
                  if (rlen > 3) resolved[rlen++] = _SC_;
                  strcpy2(&(resolved[rlen]), cp);
                  rlen += flen;
            }

            dentp = (dent_t *)&(xdirp -> dd_buf[dp -> d_fileno]);
            xdirp -> dd_top = xdirp -> dd_off =
                  clust32(&(devlist[dd]), dentp);
            xdirp -> dd_loc = 0L;
            cachepath += len;
            *(cachepath++) = _SC_;
            *cachepath = '\0';
      }

      if (*(dd2path(dd)) && !(dd2dentp(dd) -> attr & DS_IFDIR)) {
            _dosclosedir(xdirp);
            doserrno = ENOTDIR;
            errno = duperrno;
            return(NULL);
      }
      errno = duperrno;

      return(xdirp);
}

static int NEAR _dosclosedir(xdirp)
dosDIR *xdirp;
{
      int n, duperrno;

      duperrno = errno;
      if (xdirp -> dd_id != DID_IFDOSDRIVE) return(0);
      if (xdirp -> dd_buf) free(xdirp -> dd_buf);
      n = _dosclosedev(xdirp -> dd_fd);
      free(xdirp);
      errno = duperrno;

      return(n);
}

DIR *dosopendir(path)
CONST char *path;
{
      dosDIR *xdirp;

      if (!(xdirp = _dosopendir(path, NULL, 0))) {
            errno = doserrno;
            return(NULL);
      }

      return((DIR *)xdirp);
}

int dosclosedir(dirp)
DIR *dirp;
{
      if (_dosclosedir((dosDIR *)dirp) < 0) return(seterrno(doserrno));

      return(0);
}

static int NEAR seekdent(xdirp, dentp, clust, offset)
dosDIR *xdirp;
dent_t *dentp;
long clust, offset;
{
      long next;

      if (xdirp -> dd_id != DID_IFDOSDRIVE) {
            doserrno = EINVAL;
            return(-1);
      }
      xdirp -> dd_off = clust;
      next = clustread(&(devlist[xdirp -> dd_fd]),
            (u_char *)(xdirp -> dd_buf), xdirp -> dd_off);
      if (next < 0L) return(-1);
      dd2clust(xdirp -> dd_fd) = xdirp -> dd_off;
      xdirp -> dd_off = next;
      dd2offset(xdirp -> dd_fd) = xdirp -> dd_loc = offset;
      if (dentp)
            memcpy((char *)dentp,
                  (char *)&(xdirp -> dd_buf[xdirp -> dd_loc]),
                  sizeof(*dentp));
      xdirp -> dd_loc += DOSDIRENT;
      if (xdirp -> dd_loc >= xdirp -> dd_size) xdirp -> dd_loc = 0L;

      return(0);
}

static int NEAR readdent(xdirp, dentp, force)
dosDIR *xdirp;
dent_t *dentp;
int force;
{
      long next;

      if (xdirp -> dd_id != DID_IFDOSDRIVE) {
            doserrno = EINVAL;
            return(-1);
      }
      if (!xdirp -> dd_loc) {
            next = clustread(&(devlist[xdirp -> dd_fd]),
                  (u_char *)(xdirp -> dd_buf), xdirp -> dd_off);
            if (next < 0L) return(-1);
            dd2clust(xdirp -> dd_fd) = xdirp -> dd_off;
            xdirp -> dd_off = next;
      }

      dd2offset(xdirp -> dd_fd) = xdirp -> dd_loc;
      memcpy((char *)dentp,
            (char *)&(xdirp -> dd_buf[xdirp -> dd_loc]), sizeof(*dentp));
      if (force || dentp -> name[0]) {
            xdirp -> dd_loc += DOSDIRENT;
            if (xdirp -> dd_loc >= xdirp -> dd_size) xdirp -> dd_loc = 0L;
      }

      return(0);
}

static struct dosdirent *NEAR _dosreaddir(xdirp, all)
dosDIR *xdirp;
int all;
{
      dent_t *dentp;
      static st_dosdirent d;
      struct dosdirent *dp;
      char *cp, buf[LFNENTSIZ * 2 + 1];
      long loc, clust, offset;
      u_int ch;
      int i, j, cnt, sum;

      dp = (struct dosdirent *)&d;
      dentp = dd2dentp(xdirp -> dd_fd);
      dp -> d_name[0] = '\0';
      dp -> d_reclen = DOSDIRENT;
      cnt = -1;
      clust = -1;
      offset = 0L;
      sum = -1;
      for (;;) {
            loc = xdirp -> dd_loc;
            if (readdent(xdirp, dentp, 0) < 0 || !(dentp -> name[0])) {
                  *dd2path(xdirp -> dd_fd) = '\0';
                  doserrno = 0;
                  cnvunicode(0, -1);
                  return(NULL);
            }
            if (dentp -> name[0] == 0xe5) {
                  dp -> d_name[0] = '\0';
                  dp -> d_reclen = DOSDIRENT;
                  cnt = -1;
                  continue;
            }
            if (dentp -> attr != DS_IFLFN) break;

            cp = (char *)dentp;
            if (cnt > 0 && cnt == *cp + 1 && sum == dentp -> checksum)
                  cnt--;
            else {
                  dp -> d_name[0] = '\0';
                  dp -> d_reclen = DOSDIRENT;
                  if ((cnt = *cp - '@') < 0) continue;
                  lfn_clust = dd2clust(xdirp -> dd_fd);
                  lfn_offset = dd2offset(xdirp -> dd_fd);
                  sum = dentp -> checksum;
            }

            if (!(devlist[xdirp -> dd_fd].flags & F_VFAT)) continue;

            dp -> d_reclen += DOSDIRENT;
            for (i = 1, j = 0; i < DOSDIRENT; i += 2, j++) {
                  if (cp + i == (char *)&(dentp -> attr)) i += 3;
                  else if (cp + i == (char *)(dentp -> clust)) i += 2;
                  if (!(ch = lfndecode(cp[i + 1], cp[i]))) break;
                  if (ch & 0xff00) buf[j++] = (ch >> 8) & 0xff;
                  buf[j] = ch & 0xff;
            }
            i = strlen(dp -> d_name);
            if (i + j > MAXNAMLEN && (j = MAXNAMLEN - i) < 0) j = 0;
            buf[j] = '\0';
            if (j > 0) {
                  memmove(&(dp -> d_name[j]),
                        dp -> d_name, strlen(dp -> d_name) + 1);
                  memcpy(dp -> d_name, buf, j);
            }
            clust = xdirp -> dd_off;
            offset = xdirp -> dd_loc;
      }
      dp -> d_fileno = loc;
      if (cnt != 1) dp -> d_name[0] = '\0';
      else if (sum != calcsum(dd2dentp(xdirp -> dd_fd) -> name)) {
            cnt = -1;
            dp -> d_name[0] = '\0';
      }
      if (cnt <= 0) lfn_clust = -1;
      if (!dp -> d_name[0]) {
            getdosname(dp -> d_name, dd2dentp(xdirp -> dd_fd) -> name,
                  dd2dentp(xdirp -> dd_fd) -> ext);
#if   MSDOS
            dp -> d_alias[0] = '\0';
#endif
      }
      else {
#if   MSDOS
            getdosname(dp -> d_alias, dd2dentp(xdirp -> dd_fd) -> name,
                  dd2dentp(xdirp -> dd_fd) -> ext);
#endif
            if (all) {
                  xdirp -> dd_off = clust;
                  xdirp -> dd_loc = offset;
            }
      }
      if ((cp = strrdelim(dd2path(xdirp -> dd_fd), 0))) cp++;
      else cp = dd2path(xdirp -> dd_fd);
      strcpy2(cp, dp -> d_name);
      cnvunicode(0, -1);

      return(dp);
}

struct dosdirent *dosreaddir(dirp)
DIR *dirp;
{
      dosDIR *xdirp;
      struct dosdirent *dp;
      int i;
#if   !MSDOS
      int c;
#endif

      xdirp = (dosDIR *)dirp;
      if (!(dp = _dosreaddir(xdirp, 0))) {
            errno = doserrno;
            return(NULL);
      }
      if (!(devlist[xdirp -> dd_fd].flags & F_VFAT)) {
            for (i = 0; dp -> d_name[i]; i++) {
                  if (issjis1(dp -> d_name[i])
                  && issjis2(dp -> d_name[i + 1]))
                        i++;
#if   !MSDOS
                  else if ((c = detranschar(dp -> d_name[i])))
                        dp -> d_name[i] = c;
                  else dp -> d_name[i] = tolower2(dp -> d_name[i]);
#endif
            }
      }

      return(dp);
}

static struct dosdirent *NEAR finddirent(xdirp, fname, len, needlfn)
dosDIR *xdirp;
CONST char *fname;
int len, needlfn;
{
      struct dosdirent *dp;
      u_char dosname[8 + 3 + 1];
      char tmp[8 + 1 + 3 + 1];

      if (len <= 0) len = strlen(fname);
      if (devlist[xdirp -> dd_fd].flags & F_VFAT) {
            if (needlfn) while ((dp = _dosreaddir(xdirp, 1))) {
                  getdosname(tmp, dd2dentp(xdirp -> dd_fd) -> name,
                        dd2dentp(xdirp -> dd_fd) -> ext);
                  if (!cmpdospath(fname, tmp, len, 0)
                  || !cmpdospath(fname, dp -> d_name, len, 0))
                        return(dp);
            }
            else while ((dp = _dosreaddir(xdirp, 1)))
                  if (!cmpdospath(fname, dp -> d_name, len, 0))
                        return(dp);
      }
      else {
            if (!putdosname(dosname, fname, 0)) {
                  doserrno = ENOENT;
                  return(NULL);
            }
            getdosname(tmp, dosname, dosname + 8);
            while ((dp = _dosreaddir(xdirp, 1)))
                  if (!cmpdospath(tmp, dp -> d_name, len, 0)) return(dp);
      }

      return(NULL);
}

int dosrewinddir(dirp)
DIR *dirp;
{
      dosDIR *xdirp;

      xdirp = (dosDIR *)dirp;
      if (xdirp -> dd_id != DID_IFDOSDRIVE) return(seterrno(EINVAL));
      xdirp -> dd_loc = 0L;
      xdirp -> dd_off = xdirp -> dd_top;

      return(0);
}

int doschdir(path)
CONST char *path;
{
      dosDIR *xdirp;
      char *tmp, buf[DOSMAXPATHLEN];
      int drv, drive, needlfn;

      if ((drive = getdrive(path)) < 0) return(seterrno(doserrno));
      drv = toupper2(drive);

      needlfn = islower2(drive);
      if (!(xdirp = _dosopendir(path, buf, needlfn))) {
            if (path[2] == '/' || path[2] == '\\'
            || !(tmp = curdir[drv - 'A']))
                  return(seterrno(doserrno));
            curdir[drv - 'A'] = NULL;
            xdirp = _dosopendir(path, buf, needlfn);
            curdir[drv - 'A'] = tmp;
            if (!xdirp) return(seterrno(doserrno));
      }
      _dosclosedir(xdirp);

      if (!buf[2]) buf[3] = '\0';
      if (!(tmp = (char *)malloc(strlen(&(buf[3])) + 1))) return(-1);
      if (curdir[drv - 'A']) free(curdir[drv - 'A']);
      curdir[drv - 'A'] = tmp;
      strcpy2(curdir[drv - 'A'], &(buf[3]));
      lastdrive = drive;

      return(0);
}

char *dosgetcwd(pathname, size)
char *pathname;
int size;
{
      char *cp;
      int i;

      if (!pathname && !(pathname = (char *)malloc(size))) return(NULL);

      i = toupper2(lastdrive) - 'A';
      if (lastdrive < 0) {
            errno = EFAULT;
            return(NULL);
      }
      if (!(cp = curdir[i])) {
            errno = EFAULT;
            return(NULL);
      }

      if (strlen(cp) + 3 > size) {
            errno = ERANGE;
            return(NULL);
      }
      strcpy2(gendospath(pathname, lastdrive, _SC_), cp);

      return(pathname);
}

static dosDIR *NEAR splitpath(pathp, resolved, needlfn)
CONST char **pathp;
char *resolved;
int needlfn;
{
      char dir[DOSMAXPATHLEN];
      int i, j;

      strcpy2(dir, *pathp);
      for (i = 1, j = 2; dir[j]; j++) {
            if (issjis1(dir[j]) && issjis2(dir[j + 1])) j++;
            else if (dir[j] == '/' || dir[j] == '\\') i = j;
      }

      *pathp += i + 1;
      if (i < 3) dir[i++] = _SC_;
      dir[i] = '\0';

      if (i <= 3 && isdotdir(*pathp)) {
            doserrno = ENOENT;
            return(NULL);
      }

      return(_dosopendir(dir, resolved, needlfn));
}

static int NEAR getdent(path, ddp)
CONST char *path;
int *ddp;
{
      dosDIR *xdirp;
      char buf[DOSMAXPATHLEN];
      int dd, drive, duperrno;

      if (ddp) *ddp = -1;
      if ((drive = parsepath(&(buf[2]), path, 1)) < 0
      || (dd = _dosopendev(drive)) < 0)
            return(-1);
      if (devlist[dd].dircache
      && buf[2] && buf[3] && !cmpdospath(dd2path(dd), &(buf[3]), -1, 0))
            return(dd);
      buf[0] = drive;
      buf[1] = ':';

      duperrno = errno;
      path = buf;
      if (!(xdirp = splitpath(&path, NULL, 0))) {
            errno = (doserrno) ? doserrno : ENOTDIR;
            dosclosedev(dd);
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }
      if (!(devlist[dd].dircache = (cache_t *)malloc(sizeof(cache_t)))) {
            _dosclosedir(xdirp);
            dosclosedev(dd);
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }
      devlist[dd].flags |= F_CACHE;

      memcpy((char *)(devlist[dd].dircache),
            (char *)(devlist[xdirp -> dd_fd].dircache), sizeof(cache_t));
      if (!*path || (isdotdir(path) && path <= &(buf[4]))) {
            _dosclosedir(xdirp);
            dd2dentp(dd) -> attr |= DS_IFDIR;
            errno = duperrno;
            return(dd);
      }
      if (!finddirent(xdirp, path, 0, 0)) {
            errno = (doserrno) ? doserrno : ENOENT;
            _dosclosedir(xdirp);
            if (ddp && !doserrno) *ddp = dd;
            else dosclosedev(dd);
            doserrno = errno;
            errno = duperrno;
            return(-1);
      }

      memcpy((char *)(devlist[dd].dircache),
            (char *)(devlist[xdirp -> dd_fd].dircache), sizeof(cache_t));
      _dosclosedir(xdirp);
      errno = duperrno;

      return(dd);
}

static int NEAR writedent(dd)
int dd;
{
      u_char *buf;
      u_long sect;
      long offset;
      int n;

      if (!(sect = clust2sect(&(devlist[dd]), dd2clust(dd)))) {
            doserrno = EIO;
            return(-1);
      }
      offset = dd2offset(dd);
      while (offset >= (long)(devlist[dd].sectsize)) {
            sect++;
            offset -= (long)(devlist[dd].sectsize);
      }
      if (!(buf = (u_char *)malloc(devlist[dd].sectsize))) return(-1);
      n = 0;
      if (sectread(&(devlist[dd]), sect, buf, 1) < 0L) n = -1;
      else {
            memcpy((char *)&(buf[offset]),
                  (char *)dd2dentp(dd), sizeof(dent_t));
            if (sectwrite(&(devlist[dd]), sect, buf, 1) < 0L) n = -1;
      }
      free(buf);

      return(n);
}

static int NEAR expanddent(dd)
int dd;
{
      long prev;

      prev = dd2clust(dd);
      if (!(devlist[dd].flags & F_FAT32) && (!prev || prev >= ROOTCLUST)) {
            doserrno = ENOSPC;
            return(-1);
      }
      if ((dd2clust(dd) = clustexpand(&(devlist[dd]), prev, 1)) < 0L)
            return(-1);
      memset((char *)dd2dentp(dd), 0, sizeof(dent_t));
      dd2offset(dd) = 0L;

      return(0);
}

static int NEAR creatdent(path, mode)
CONST char *path;
int mode;
{
      dosDIR *xdirp;
      dent_t *dentp;
      u_char *cp, fname[8 + 3 + 1], longfname[DOSMAXNAMLEN + 1];
      CONST char *file;
      char tmp[8 + 1 + 3 + 1], buf[DOSMAXPATHLEN];
      long clust, offset;
      u_int c;
      int i, j, n, len, cnt, sum, lfn;

      if ((n = parsepath(&(buf[2]), path, 1)) < 0) return(-1);
      buf[0] = n;
      buf[1] = ':';
      file = buf;

      if (!(xdirp = splitpath(&file, NULL, 0))) {
            if (doserrno == ENOENT) doserrno = ENOTDIR;
            return(-1);
      }
      if (!*file) {
            _dosclosedir(xdirp);
            doserrno = EEXIST;
            return(-1);
      }
      if (isdotdir(file)) {
            _dosclosedir(xdirp);
            doserrno = EACCES;
            return(-1);
      }

      if (!(devlist[xdirp -> dd_fd].flags & F_VFAT)) {
            lfn = 0;
            n = 0;
            cnt = 1;
            len = 0;
      }
      else {
            lfn = 1;
            n = -1;
            for (i = j = 0; file[i]; i++, j += 2) {
                  if (!strchr2(PACKINALIAS, file[i])) n = -1;
                  else if (n < 0) n = i;
                  if (!issjis1(file[i]) || !issjis2(file[i + 1]))
                        c = lfnencode(0, file[i]);
                  else {
                        c = lfnencode(file[i], file[i + 1]);
                        lfn = 2;
                        i++;
                  }
                  longfname[j] = c & 0xff;
                  longfname[j + 1] = (c >> 8) & 0xff;
            }
            cnvunicode(0, -1);
            if (n >= 0) j = n * 2;
            n = 1;
            cnt = j / (LFNENTSIZ * 2);
            len = j;
            if (j > cnt * LFNENTSIZ * 2) {
                  longfname[j] = longfname[j + 1] = '\0';
                  len += 2;
                  cnt++;
            }
            cnt++;
      }

      sum = -1;
      dentp = dd2dentp(xdirp -> dd_fd);
      if (!putdosname(fname, file, n)) {
            _dosclosedir(xdirp);
            doserrno = EACCES;
            return(-1);
      }

      for (i = 0; i < INHIBITNAMESIZ; i++)
            if (!strncmp((char *)fname, inhibitname[i], 8)) break;
      if (i < INHIBITNAMESIZ
      || (!strncmp((char *)fname, INHIBITCOM, strsize(INHIBITCOM))
      && fname[strsize(INHIBITCOM)] > '0'
      && fname[strsize(INHIBITCOM)] <= '0' + INHIBITCOMMAX
      && fname[strsize(INHIBITCOM) + 1] == ' ')
      || (!strncmp((char *)fname, INHIBITLPT, strsize(INHIBITLPT))
      && fname[strsize(INHIBITLPT)] > '0'
      && fname[strsize(INHIBITLPT)] <= '0' + INHIBITLPTMAX
      && fname[strsize(INHIBITLPT) + 1] == ' ')) {
            _dosclosedir(xdirp);
            doserrno = EINVAL;
            return(-1);
      }

      if (lfn == 1 && !strcmp(getdosname(tmp, fname, fname + 8), file)) {
            lfn = 0;
            cnt = 1;
      }
      if (lfn) sum = calcsum(fname);

      i = j = 0;
      clust = -1;
      offset = 0L;
      for (;;) {
            if (readdent(xdirp, dentp, 1) < 0) {
                  if (clust >= 0) break;
                  if (doserrno || expanddent(xdirp -> dd_fd) < 0) {
                        *dd2path(xdirp -> dd_fd) = '\0';
                        _dosclosedir(xdirp);
                        return(-1);
                  }
                  clust = dd2clust(xdirp -> dd_fd);
                  offset = 0L;
                  break;
            }
            if (!(dentp -> name[0])) break;
            if (dentp -> name[0] == 0xe5) {
                  i++;
                  if (clust < 0) {
                        clust = dd2clust(xdirp -> dd_fd);
                        offset = dd2offset(xdirp -> dd_fd);
                  }
                  continue;
            }
            if (j < i) j = i;
            if (j < cnt) clust = -1;
            i = 0;
            if (dentp -> attr == DS_IFLFN) continue;

            if (!strncmp((char *)(dentp -> name), (char *)fname, 8 + 3)) {
                  if (!n) {
                        *dd2path(xdirp -> dd_fd) = '\0';
                        _dosclosedir(xdirp);
                        doserrno = EEXIST;
                        return(-1);
                  }
                  n++;
                  if (!putdosname(fname, file, n)) {
                        *dd2path(xdirp -> dd_fd) = '\0';
                        _dosclosedir(xdirp);
                        doserrno = EACCES;
                        return(-1);
                  }
                  sum = calcsum(fname);
                  i = j = 0;
                  clust = -1;
                  dosrewinddir((DIR *)xdirp);
            }
      }

      if (clust >= 0 && seekdent(xdirp, NULL, clust, offset) < 0) {
            *dd2path(xdirp -> dd_fd) = '\0';
            _dosclosedir(xdirp);
            return(-1);
      }
      cp = (u_char *)dentp;
      while (--cnt > 0) {
            memset((char *)dentp, 0, sizeof(*dentp));
            cp[0] = cnt;
            n = (cnt - 1) * (LFNENTSIZ * 2);
            if (n + (LFNENTSIZ * 2) >= len) cp[0] += '@';
            dentp -> checksum = sum;
            dentp -> attr = DS_IFLFN;
            for (i = 1, j = 0; i < DOSDIRENT; i += 2, j += 2) {
                  if (cp + i == (u_char *)&(dentp -> attr)) i += 3;
                  else if (cp + i == (u_char *)(dentp -> clust)) i += 2;
                  if (n + j >= len) cp[i] = cp[i + 1] = 0xff;
                  else {
                        cp[i] = longfname[n + j];
                        cp[i + 1] = longfname[n + j + 1];
                  }
            }
            if (writedent(xdirp -> dd_fd) < 0
            || (readdent(xdirp, dentp, 1) < 0
            && (doserrno || expanddent(xdirp -> dd_fd) < 0))) {
                  *dd2path(xdirp -> dd_fd) = '\0';
                  _dosclosedir(xdirp);
                  return(-1);
            }
      }

      memset((char *)dentp, 0, sizeof(*dentp));
      memcpy(dentp -> name, (char *)fname, 8 + 3);
      dentp -> attr = putdosmode((u_short)mode) | DS_IARCHIVE;
      i = putdostime(dentp -> time, -1);
      if (devlist[xdirp -> dd_fd].flags & F_VFAT) {
            dentp -> checksum = i / 10;
            dentp -> ctime[0] = dentp -> time[0];
            dentp -> ctime[1] = dentp -> time[1];
            dentp -> cdate[0] = dentp -> adate[0] = dentp -> date[0];
            dentp -> cdate[1] = dentp -> adate[1] = dentp -> date[1];
      }
      if (writedent(xdirp -> dd_fd) < 0
      || writefat(&(devlist[xdirp -> dd_fd])) < 0)
            n = -1;
      else {
            n = xdirp -> dd_fd;
            if ((cp = (u_char *)strrdelim(dd2path(n), 0))) cp++;
            else cp = (u_char *)dd2path(n);
            strcpy2((char *)cp, file);
      }
      free(xdirp -> dd_buf);
      free(xdirp);

      return(n);
}

static int NEAR unlinklfn(dd, clust, offset, sum)
int dd;
long clust, offset;
int sum;
{
      dosDIR xdir;
      long dupclust, dupoffset;

      if (clust < 0) return(0);
      dupclust = dd2clust(dd);
      dupoffset = dd2offset(dd);
      sum &= 0xff;
      xdir.dd_id = DID_IFDOSDRIVE;
      xdir.dd_fd = dd;
      xdir.dd_loc = 0L;
      xdir.dd_size = (long)(devlist[dd].clustsize)
            * (long)(devlist[dd].sectsize);
      xdir.dd_top = xdir.dd_off = clust;
      if (!(xdir.dd_buf = (char *)malloc(xdir.dd_size))) return(-1);

      seekdent(&xdir, dd2dentp(dd), clust, offset);
      *(dd2dentp(dd) -> name) = 0xe5;
      writedent(dd);
      while (readdent(&xdir, dd2dentp(dd), 0) >= 0) {
            if (!dd2dentp(dd) -> name[0] || dd2dentp(dd) -> name[0] == 0xe5
            || (dd2clust(dd) == dupclust && dd2offset(dd) == dupoffset)
            || dd2dentp(dd) -> attr != 0x0f
            || dd2dentp(dd) -> checksum != sum)
                  break;
            *(dd2dentp(dd) -> name) = 0xe5;
            writedent(dd);
      }
      free(xdir.dd_buf);

      return(0);
}

#if   MSDOS
char *dosshortname(path, alias)
CONST char *path;
char *alias;
{
      dosDIR *xdirp;
      char *cp, buf[DOSMAXPATHLEN], name[8 + 1 + 3 + 1];
      int dd, drive;

      name[0] = '\0';
      if ((drive = parsepath(&(buf[2]), path, 1)) < 0
      || (dd = _dosopendev(drive)) < 0) {
            errno = doserrno;
            return(NULL);
      }
      if (devlist[dd].dircache
      && buf[2] && buf[3] && !cmpdospath(dd2path(dd), &(buf[3]), -1, 0))
            getdosname(name, dd2dentp(dd) -> name, dd2dentp(dd) -> ext);
      buf[0] = drive;
      buf[1] = ':';
      path = buf;

      *alias = '\0';
      if (!(xdirp = splitpath(&path, alias, 0))) {
            errno = (doserrno) ? doserrno : ENOTDIR;
            dosclosedev(dd);
            return(NULL);
      }
      cp = strcatdelim(alias);
      if (!*path);
      else if (*name) strcpy2(cp, name);
      else if (isdotdir(path)) strcpy2(cp, path);
      else if (finddirent(xdirp, path, 0, 0))
            getdosname(cp, dd2dentp(xdirp -> dd_fd) -> name,
                  dd2dentp(xdirp -> dd_fd) -> ext);
      else {
            errno = (doserrno) ? doserrno : ENOENT;
            alias = NULL;
      }
      _dosclosedir(xdirp);
      dosclosedev(dd);

      return(alias);
}

char *doslongname(path, resolved)
CONST char *path;
char *resolved;
{
      dosDIR *xdirp;
      struct dosdirent *dp;
      char *cp, buf[DOSMAXPATHLEN];
      int dd, drive;

      if ((drive = parsepath(&(buf[2]), path, 1)) < 0
      || (dd = _dosopendev(drive)) < 0) {
            errno = doserrno;
            return(NULL);
      }
      buf[0] = drive;
      buf[1] = ':';
      path = buf;

      *resolved = '\0';
      if (!(xdirp = splitpath(&path, resolved, 1))) {
            errno = (doserrno) ? doserrno : ENOTDIR;
            dosclosedev(dd);
            return(NULL);
      }
      cp = strcatdelim(resolved);
      if (!*path);
      else if ((dp = finddirent(xdirp, path, 0, 1)))
            strcpy2(cp, dp -> d_name);
      else {
            errno = (doserrno) ? doserrno : ENOENT;
            resolved = NULL;
      }
      _dosclosedir(xdirp);
      dosclosedev(dd);

      return(resolved);
}
#endif      /* MSDOS */

int dosstatfs(drive, buf)
int drive;
char *buf;
{
      long block, total, avail;
      int dd;

      if ((dd = _dosopendev(drive)) < 0) return(seterrno(doserrno));
      block = (long)(devlist[dd].clustsize) * (long)(devlist[dd].sectsize);
      total = (long)(devlist[dd].totalsize);
      if (availfat(&(devlist[dd])) < 0) {
            dosclosedev(dd);
            return(seterrno(doserrno));
      }
      avail = (long)(devlist[dd].availsize);

      *((long *)&(buf[0 * sizeof(long)])) = block;
      *((long *)&(buf[1 * sizeof(long)])) = total;
      *((long *)&(buf[2 * sizeof(long)])) = avail;
      buf[3 * sizeof(long)] = 0;
      if (devlist[dd].flags & F_FAT32) buf[3 * sizeof(long)] |= 001;
      dosclosedev(dd);

      return(0);
}

int dosstat(path, stp)
CONST char *path;
struct stat *stp;
{
      char *cp;
      int dd;

      if ((dd = getdent(path, NULL)) < 0) return(seterrno(doserrno));
      stp -> st_dev = dd;
      stp -> st_ino = clust32(&(devlist[dd]), dd2dentp(dd));
      stp -> st_mode = getdosmode(dd2dentp(dd) -> attr);
      stp -> st_nlink = 1;
      stp -> st_uid = (uid_t)-1;
      stp -> st_gid = (gid_t)-1;
      stp -> st_size = byte2dword(dd2dentp(dd) -> size);
      stp -> st_atime =
      stp -> st_mtime =
      stp -> st_ctime = getdostime(byte2word(dd2dentp(dd) -> date),
            byte2word(dd2dentp(dd) -> time));
#if   !MSDOS && defined (UF_SETTABLE) && defined (SF_SETTABLE)
      stp -> st_flags = (u_long)0;
#endif
      dosclosedev(dd);

      if ((stp -> st_mode & S_IFMT) != S_IFDIR
      && (cp = strrchr2(path, '.')) && strlen(++cp) == 3) {
            if (!strcasecmp2(cp, EXTCOM)
            || !strcasecmp2(cp, EXTEXE) || !strcasecmp2(cp, EXTBAT))
                  stp -> st_mode |= S_IEXEC_ALL;
      }

      return(0);
}

int doslstat(path, stp)
CONST char *path;
struct stat *stp;
{
      return(dosstat(path, stp));
}

int dosaccess(path, mode)
CONST char *path;
int mode;
{
      struct stat st;
      char buf[DOSMAXPATHLEN - 2];
      int dd, drive;

      if (dosstat(path, &st) < 0) {
            if (errno != ENOENT) return(-1);
            if ((drive = parsepath(buf, path, 1)) < 0
            || (dd = _dosopendev(drive)) < 0)
                  return(seterrno(ENOENT));
            dosclosedev(dd);
            if (*buf != _SC_ || isdotdir(&(buf[1])) != 2)
                  return(seterrno(ENOENT));
            st.st_dev = dd;
            st.st_mode = (S_IFDIR | S_IRUSR | S_IWUSR | S_IXUSR);
      }

      if (((mode & R_OK) && !(st.st_mode & S_IRUSR))
      || ((mode & W_OK)
            && (!(st.st_mode & S_IWUSR)
            || (devlist[st.st_dev].flags & F_RONLY)))
      || ((mode & X_OK) && !(st.st_mode & S_IXUSR)))
            return(seterrno(EACCES));

      return(0);
}

#ifndef     NOSYMLINK
/*ARGSUSED*/
int dossymlink(name1, name2)
CONST char *name1, *name2;
{
      return(seterrno(EACCES));
}

/*ARGSUSED*/
int dosreadlink(path, buf, bufsiz)
CONST char *path;
char *buf;
int bufsiz;
{
      return(seterrno(EINVAL));
}
#endif      /* !NOSYMLINK */

int doschmod(path, mode)
CONST char *path;
int mode;
{
      int n, dd;

      if ((dd = getdent(path, NULL)) < 0) return(seterrno(doserrno));
      dd2dentp(dd) -> attr = putdosmode((u_short)mode);
      if ((n = writedent(dd)) < 0) errno = doserrno;
      dosclosedev(dd);

      return(n);
}

#ifdef      USEUTIME
int dosutime(path, times)
CONST char *path;
CONST struct utimbuf *times;
{
      time_t t = times -> modtime;
#else
int dosutimes(path, tvp)
CONST char *path;
CONST struct timeval *tvp;
{
      time_t t = tvp[1].tv_sec;
#endif
      int n, dd;

      if ((dd = getdent(path, NULL)) < 0) return(seterrno(doserrno));
      putdostime(dd2dentp(dd) -> time, t);
      if ((n = writedent(dd)) < 0) errno = doserrno;
      dosclosedev(dd);

      return(n);
}

int dosunlink(path)
CONST char *path;
{
      int n, dd, sum;

      if ((dd = getdent(path, NULL)) < 0) return(seterrno(doserrno));
      if (dd2dentp(dd) -> attr & DS_IFDIR) return(seterrno(EPERM));
      sum = calcsum(dd2dentp(dd) -> name);
      *(dd2dentp(dd) -> name) = 0xe5;
      *dd2path(dd) = '\0';

      n = 0;
      if (writedent(dd) < 0
      || clustfree(&(devlist[dd]), clust32(&(devlist[dd]), dd2dentp(dd))) < 0
      || unlinklfn(dd, lfn_clust, lfn_offset, sum) < 0
      || writefat(&(devlist[dd])) < 0) {
            errno = doserrno;
            n = -1;
      }
      dosclosedev(dd);

      return(n);
}

int dosrename(from, to)
CONST char *from, *to;
{
      char buf[DOSMAXPATHLEN];
      long clust, rmclust, offset;
      int i, n, dd, fd, sum;

      if ((i = parsepath(buf, to, 0)) < 0) return(seterrno(doserrno));
      if (toupper2(i) != toupper2(getdrive(from))) return(seterrno(EXDEV));
      if ((dd = getdent(from, NULL)) < 0) return(seterrno(doserrno));

      clust = lfn_clust;
      offset = lfn_offset;

      i = strlen(dd2path(dd));
      if (buf[0] && buf[1] && !cmpdospath(dd2path(dd), &(buf[1]), i, 1)) {
            dosclosedev(dd);
            return(seterrno(EINVAL));
      }
      if (*(dd2dentp(dd) -> name) == '.') {
            dosclosedev(dd);
            return(seterrno(EACCES));
      }
      if ((fd = dosopen(to, O_BINARY | O_RDWR | O_CREAT, 0666)) < 0) {
            dosclosedev(dd);
            return(-1);
      }
      fd -= DOSFDOFFSET;
      rmclust = clust32(fd2devp(fd), fd2dentp(fd));
      sum = calcsum(dd2dentp(dd) -> name);
      memcpy((char *)&(fd2dentp(fd) -> attr),
            (char *)&(dd2dentp(dd) -> attr),
            (int)sizeof(dent_t) - (8 + 3));
      *(dd2dentp(dd) -> name) = 0xe5;
      *dd2path(dd) = '\0';

      free(dosflist[fd]._base);
      dosflist[fd]._base = NULL;
      while (maxdosf > 0 && !dosflist[maxdosf - 1]._base) maxdosf--;
      fd2clust(fd) = dosflist[fd]._clust;
      fd2offset(fd) = dosflist[fd]._offset;

      n = 0;
      if (writedent(dosflist[fd]._file) < 0 || writedent(dd) < 0
      || unlinklfn(dd, clust, offset, sum) < 0
      || (rmclust && clustfree(&(devlist[dd]), rmclust) < 0)
      || writefat(&(devlist[dd])) < 0) {
            errno = doserrno;
            n = -1;
      }
      dosclosedev(dosflist[fd]._file);
      dosclosedev(dd);

      return(n);
}

int dosopen(path, flags, mode)
CONST char *path;
int flags, mode;
{
      int fd, dd, tmp;

      for (fd = 0; fd < maxdosf; fd++) if (!dosflist[fd]._base) break;
      if (fd >= DOSNOFILE) return(seterrno(EMFILE));

      if ((dd = getdent(path, &tmp)) < 0) {
            if (doserrno != ENOENT || tmp < 0 || !(flags & O_CREAT)
            || (dd = creatdent(path, mode & 0777)) < 0) {
                  errno = doserrno;
                  if (tmp >= 0) dosclosedev(tmp);
                  return(-1);
            }
            else {
                  if (!(devlist[tmp].flags & F_DUPL))
                        devlist[dd].flags &= ~F_DUPL;
                  devlist[tmp].flags |= F_DUPL;
                  dosclosedev(tmp);
            }
      }
      else if ((flags & O_CREAT) && (flags & O_EXCL)) {
            dosclosedev(dd);
            return(seterrno(EEXIST));
      }

      if ((flags & O_ACCMODE) != O_RDONLY) {
            tmp = 0;
            if (devlist[dd].flags & F_RONLY) tmp = EROFS;
            else if (dd2dentp(dd) -> attr & DS_IFDIR) tmp = EISDIR;
            if (tmp) {
                  errno = tmp;
                  dosclosedev(dd);
                  return(-1);
            }
      }
      if (flags & O_TRUNC) {
            if ((flags & O_ACCMODE) != O_RDONLY
            && clustfree(&(devlist[dd]),
            clust32(&(devlist[dd]), dd2dentp(dd))) < 0) {
                  errno = doserrno;
                  dosclosedev(dd);
                  return(-1);
            }
            dd2dentp(dd) -> size[0] =
            dd2dentp(dd) -> size[1] =
            dd2dentp(dd) -> size[2] =
            dd2dentp(dd) -> size[3] = 0;
            dd2dentp(dd) -> clust[0] =
            dd2dentp(dd) -> clust[1] =
            dd2dentp(dd) -> clust_h[0] =
            dd2dentp(dd) -> clust_h[1] = 0;
      }

      dosflist[fd]._base = (char *)malloc((long)(devlist[dd].clustsize)
                  * (long)(devlist[dd].sectsize));
      if (!dosflist[fd]._base) {
            dosclosedev(dd);
            return(-1);
      }

      dosflist[fd]._cnt = 0L;
      dosflist[fd]._ptr = dosflist[fd]._base;
      dosflist[fd]._bufsize =
            (long)(devlist[dd].clustsize) * (long)(devlist[dd].sectsize);
      dosflist[fd]._flag = flags;
      dosflist[fd]._file = dd;
      dosflist[fd]._top =
      dosflist[fd]._next = clust32(&(devlist[dd]), dd2dentp(dd));
      dosflist[fd]._off = 0L;
      dosflist[fd]._loc = (off_t)0;
      dosflist[fd]._size = (off_t)byte2dword(dd2dentp(dd) -> size);

      memcpy((char *)&(dosflist[fd]._dent),
            (char *)dd2dentp(dd), sizeof(dent_t));
      dosflist[fd]._clust = dd2clust(dd);
      dosflist[fd]._offset = dd2offset(dd);
      if (fd >= maxdosf) maxdosf = fd + 1;
      if ((flags & O_ACCMODE) != O_RDONLY && (flags & O_APPEND))
            doslseek(fd + DOSFDOFFSET, (off_t)0, L_XTND);

      return(fd + DOSFDOFFSET);
}

int dosclose(fd)
int fd;
{
      int n;

      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf || !dosflist[fd]._base)
            return(seterrno(EBADF));
      free(dosflist[fd]._base);
      dosflist[fd]._base = NULL;
      while (maxdosf > 0 && !dosflist[maxdosf - 1]._base) maxdosf--;

      n = 0;
      if ((dosflist[fd]._flag & O_ACCMODE) != O_RDONLY) {
            dosflist[fd]._dent.size[0] = dosflist[fd]._size & 0xff;
            dosflist[fd]._dent.size[1] = (dosflist[fd]._size >> 8) & 0xff;
            dosflist[fd]._dent.size[2] = (dosflist[fd]._size >> 16) & 0xff;
            dosflist[fd]._dent.size[3] = (dosflist[fd]._size >> 24) & 0xff;

            if (!(dosflist[fd]._dent.attr & DS_IFDIR))
                  putdostime(dosflist[fd]._dent.time, -1);
            memcpy((char *)fd2dentp(fd),
                  (char *)&(dosflist[fd]._dent), sizeof(dent_t));
            fd2clust(fd) = dosflist[fd]._clust;
            fd2offset(fd) = dosflist[fd]._offset;
            if (writedent(dosflist[fd]._file) < 0
            || writefat(fd2devp(fd)) < 0) {
                  errno = doserrno;
                  n = -1;
            }
      }
      dosclosedev(dosflist[fd]._file);

      return(n);
}

static long NEAR dosfilbuf(fd, wrt)
int fd, wrt;
{
      long size, new, prev;

      size = dosflist[fd]._bufsize;
      if (!wrt && (off_t)size > dosflist[fd]._size - dosflist[fd]._loc)
            size = dosflist[fd]._size - dosflist[fd]._loc;
      prev = dosflist[fd]._off;
      if ((dosflist[fd]._off = dosflist[fd]._next))
            dosflist[fd]._next = clustread(fd2devp(fd),
                  (u_char *)(dosflist[fd]._base), dosflist[fd]._next);
      else {
            doserrno = 0;
            dosflist[fd]._next = -1L;
      }

      if (dosflist[fd]._next < 0L) {
            if (doserrno) return(-1L);
            if (!wrt) return(0L);
            if ((new = clustexpand(fd2devp(fd), prev, 0)) < 0L)
                  return(-1L);
            if (!dosflist[fd]._off) {
                  dosflist[fd]._dent.clust[0] = new & 0xff;
                  dosflist[fd]._dent.clust[1] = (new >> 8) & 0xff;
                  if (fd2devp(fd) -> flags & F_FAT32) {
                        dosflist[fd]._dent.clust_h[0] =
                              (new >> 16) & 0xff;
                        dosflist[fd]._dent.clust_h[1] =
                              (new >> 24) & 0xff;
                  }
            }
            dosflist[fd]._off = new;
            dosflist[fd]._next = ENDCLUST;
            memset(dosflist[fd]._base, 0, dosflist[fd]._bufsize);
      }
      dosflist[fd]._cnt = size;
      dosflist[fd]._ptr = dosflist[fd]._base;

      return(size);
}

static long NEAR dosflsbuf(fd)
int fd;
{
      u_long sect;
      long l;

      if (!(sect = clust2sect(fd2devp(fd), dosflist[fd]._off))) {
            doserrno = EIO;
            return(-1L);
      }
      l = sectwrite(fd2devp(fd), sect,
            (u_char *)(dosflist[fd]._base), fd2devp(fd) -> clustsize);
      if (l < 0L) return(-1L);

      return(dosflist[fd]._bufsize);
}

int dosread(fd, buf, nbytes)
int fd;
char *buf;
int nbytes;
{
      long size, total;
      int wrt;

      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf
      || (buf && (dosflist[fd]._flag & O_ACCMODE) == O_WRONLY))
            return(seterrno(EBADF));
      wrt = ((dosflist[fd]._flag & O_ACCMODE) != O_RDONLY) ? 1 : 0;

      total = 0;
      while (nbytes > 0 && dosflist[fd]._loc < dosflist[fd]._size) {
            if (dosflist[fd]._cnt <= 0L && dosfilbuf(fd, wrt) < 0L)
                  return(seterrno(doserrno));
            if (!(size = dosflist[fd]._cnt)) return(total);

            if (size > nbytes) size = nbytes;
            memcpy(buf, dosflist[fd]._ptr, size);
            buf += size;
            dosflist[fd]._ptr += size;
            dosflist[fd]._cnt -= size;
            dosflist[fd]._loc += size;
            nbytes -= size;
            total += size;
      }

      return(total);
}

int doswrite(fd, buf, nbytes)
int fd;
CONST char *buf;
int nbytes;
{
      long size, total;

      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf
      || (dosflist[fd]._flag & O_ACCMODE) == O_RDONLY)
            return(seterrno(EBADF));

      total = 0;
      while (nbytes > 0) {
            if (dosflist[fd]._cnt <= 0L && dosfilbuf(fd, 1) < 0L) {
#if   MSDOS
                  if (doserrno == ENOSPC) return(total);
#endif
                  return(seterrno(doserrno));
            }
            size = dosflist[fd]._cnt;

            if (size > nbytes) size = nbytes;
            memcpy(dosflist[fd]._ptr, buf, size);
            buf += size;
            dosflist[fd]._ptr += size;
            if ((dosflist[fd]._cnt -= size) < 0L) dosflist[fd]._cnt = 0L;
            if ((dosflist[fd]._loc += size) > dosflist[fd]._size)
                  dosflist[fd]._size = dosflist[fd]._loc;
            nbytes -= size;
            total += size;

            if (dosflsbuf(fd) < 0L) return(seterrno(doserrno));
      }

      return(total);
}

off_t doslseek(fd, offset, whence)
int fd;
off_t offset;
int whence;
{
      long size;
      int wrt;

      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf) return(seterrno(EBADF));
      wrt = ((dosflist[fd]._flag & O_ACCMODE) != O_RDONLY) ? 1 : 0;

      switch (whence) {
            case L_SET:
                  break;
            case L_INCR:
                  offset += dosflist[fd]._loc;
                  break;
            case L_XTND:
                  offset += dosflist[fd]._size;
                  break;
            default:
                  return(seterrno(EINVAL));
/*NOTREACHED*/
                  break;
      }

      if (offset >= dosflist[fd]._loc) offset -= dosflist[fd]._loc;
      else {
            dosflist[fd]._cnt = 0L;
            dosflist[fd]._ptr = dosflist[fd]._base;
            dosflist[fd]._loc = (off_t)0;
            dosflist[fd]._off = 0L;
            dosflist[fd]._next = dosflist[fd]._top;
      }

      while (offset > (off_t)0) {
            if (!wrt && dosflist[fd]._loc >= dosflist[fd]._size) break;
            if (dosflist[fd]._cnt <= 0L && dosfilbuf(fd, wrt) < 0L)
                  return(seterrno(doserrno));
            if (!(size = dosflist[fd]._cnt)) break;

            if (size > offset) size = offset;
            dosflist[fd]._ptr += size;
            dosflist[fd]._cnt -= size;
            dosflist[fd]._loc += size;
            if (dosflist[fd]._size < dosflist[fd]._loc)
                  dosflist[fd]._size = dosflist[fd]._loc;
            offset -= size;
      }

      return(dosflist[fd]._loc);
}

int dosftruncate(fd, size)
int fd;
off_t size;
{
      off_t offset;
      int n;

      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf) return(seterrno(EBADF));
      if ((dosflist[fd]._flag & O_ACCMODE) == O_RDONLY)
            return(seterrno(EINVAL));

      n = 0;
      offset = dosflist[fd]._loc;
      if (doslseek(fd + DOSFDOFFSET, size, L_SET) < (off_t)0) n = -1;
      else if (dosflist[fd]._next != ENDCLUST) {
            clustfree(fd2devp(fd), dosflist[fd]._next);
            dosflist[fd]._next = ENDCLUST;
      }
      dosflist[fd]._size = size;
      doslseek(fd + DOSFDOFFSET, offset, L_SET);

      return(n);
}

int dosmkdir(path, mode)
CONST char *path;
int mode;
{
      dent_t dent[2];
      long clust;
      int fd, tmp;

      fd = dosopen(path, O_BINARY | O_RDWR | O_CREAT | O_EXCL, mode & 0777);
      if (fd < 0) return(-1);

      fd -= DOSFDOFFSET;
      dosflist[fd]._dent.attr |= DS_IFDIR;
      dosflist[fd]._dent.attr &= ~DS_IARCHIVE;
      memcpy((char *)&(dent[0]),
            (char *)&(dosflist[fd]._dent), sizeof(*dent));
      memset(dent[0].name, ' ', 8 + 3);
      dent[0].name[0] = '.';
      if ((clust = newclust(fd2devp(fd))) < 0L) {
            errno = doserrno;
            dosflist[fd]._dent.name[0] = 0xe5;
            *fd2path(fd) = '\0';
            dosclose(fd + DOSFDOFFSET);
            return(-1);
      }
      dent[0].clust[0] = clust & 0xff;
      dent[0].clust[1] = (clust >> 8) & 0xff;
      if (fd2devp(fd) -> flags & F_FAT32) {
            dent[0].clust_h[0] = (clust >> 16) & 0xff;
            dent[0].clust_h[1] = (clust >> 24) & 0xff;
      }

      memcpy((char *)&(dent[1]),
            (char *)&(dosflist[fd]._dent), sizeof(*dent));
      memset(dent[1].name, ' ', 8 + 3);
      dent[1].name[0] =
      dent[1].name[1] = '.';
      clust = fd2clust(fd);
      dent[1].clust[0] = clust & 0xff;
      dent[1].clust[1] = (clust >> 8) & 0xff;
      if (fd2devp(fd) -> flags & F_FAT32) {
            dent[1].clust_h[0] = (clust >> 16) & 0xff;
            dent[1].clust_h[1] = (clust >> 24) & 0xff;
      }

      if (doswrite(fd + DOSFDOFFSET, (char *)dent, 2 * sizeof(*dent)) < 0) {
            tmp = errno;
            if ((clust = clust32(fd2devp(fd), &(dosflist[fd]._dent))))
                  clustfree(fd2devp(fd), clust);
            dosflist[fd]._dent.name[0] = 0xe5;
            *fd2path(fd) = '\0';
            dosclose(fd + DOSFDOFFSET);
            errno = tmp;
            return(-1);
      }

      dosflist[fd]._size = (off_t)0;
      dosclose(fd + DOSFDOFFSET);

      return(0);
}

int dosrmdir(path)
CONST char *path;
{
      dosDIR *xdirp;
      struct dosdirent *dp;
      cache_t cache;
      long clust, offset;
      int n, sum;

      if (!(xdirp = _dosopendir(path, NULL, 0))) return(seterrno(doserrno));
      memcpy((char *)&cache,
            (char *)(devlist[xdirp -> dd_fd].dircache), sizeof(cache));

      clust = lfn_clust;
      offset = lfn_offset;

      while ((dp = _dosreaddir(xdirp, 0)))
            if (!isdotdir(dp -> d_name)) {
                  _dosclosedir(xdirp);
                  return(seterrno(ENOTEMPTY));
            }

      n = 0;
      if (doserrno) {
            errno = doserrno;
            n = -1;
      }
      else {
            memcpy((char *)(devlist[xdirp -> dd_fd].dircache),
                  (char *)&cache, sizeof(cache));
            sum = calcsum(dd2dentp(xdirp -> dd_fd) -> name);
            *(dd2dentp(xdirp -> dd_fd) -> name) = 0xe5;
            *dd2path(xdirp -> dd_fd) = '\0';
            if (writedent(xdirp -> dd_fd) < 0
            || clustfree(&(devlist[xdirp -> dd_fd]),
                  clust32(&(devlist[xdirp -> dd_fd]),
                  dd2dentp(xdirp -> dd_fd))) < 0
            || unlinklfn(xdirp -> dd_fd, clust, offset, sum) < 0
            || writefat(&(devlist[xdirp -> dd_fd])) < 0) {
                  errno = doserrno;
                  n = -1;
            }
      }
      _dosclosedir(xdirp);

      return(n);
}

int dosflushbuf(fd)
int fd;
{
      fd -= DOSFDOFFSET;
      if (fd < 0 || fd >= maxdosf || !dosflist[fd]._base)
            return(seterrno(EBADF));
      if (flushcache(&(devlist[dosflist[fd]._file])) < 0)
            return(seterrno(doserrno));

      return(0);
}

int dosallclose(VOID_A)
{
      int i, n;

      n = 0;
      for (i = maxdosf - 1; i >= 0; i--)
            if (dosflist[i]._base && dosclose(i + DOSFDOFFSET) < 0)
                  n = -1;
      for (i = maxdev - 1; i >= 0; i--) {
            if (!(devlist[i].drive)) continue;
            devlist[i].nlink = 0;
            if (_dosclosedev(i) < 0) n = seterrno(doserrno);
      }

      return(n);
}
#endif      /* !_NODOSDRIVE */

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