/* Copyright (C) Yuri Dario & 2000 MySQL AB
   All the above parties has a full, independent copyright to
   the following code, including the right to use the code in
   any manner without any demands from the other parties.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; version 2
   of the License.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA */

void	    _OS2errno( APIRET rc);
longlong    _lseek64( int fd, longlong offset, int seektype);
int	    _lock64( int fd, int locktype, my_off_t start,
		     my_off_t length, myf MyFlags);
int	    _sopen64( const char *name, int oflag, int shflag, int mask);

/*
  This class is used to define a global c++ variable, that
  is initialized before main() gets called.
*/

class File64bit
{
   public:
      File64bit();  /* default constructor */
} initFile64bit;

static	APIRET (* APIENTRY _DosOpenL)(PCSZ  pszFileName,
			    PHFILE phf,
			    PULONG pulAction,
			    LONGLONG cbFile,
			    ULONG ulAttribute,
			    ULONG fsOpenFlags,
			    ULONG fsOpenMode,
			    PEAOP2 peaop2);
static	APIRET (* APIENTRY _DosSetFilePtrL)(HFILE hFile,
				   LONGLONG ib,
				   ULONG method,
				   PLONGLONG ibActual);
static	APIRET (* APIENTRY _DosSetFileLocksL)(HFILE hFile,
				    PFILELOCKL pflUnlock,
				    PFILELOCKL pflLock,
				    ULONG timeout,
				    ULONG flags);

#define  EIO	  EINVAL
#define  ESPIPE   EBADSEEK


static unsigned char const errno_tab[] =
{
  0	, EINVAL, ENOENT, ENOENT, EMFILE,  /* 0..4 */
  EACCES, EBADF,  EIO,	  ENOMEM, EIO,	   /* 5..9 */
  EINVAL, ENOEXEC,EINVAL, EINVAL, EINVAL,  /* 10..14 */
  ENOENT, EBUSY,  EXDEV,  ENOENT, EROFS,   /* 15..19 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 20..24 */
  EIO,	  EIO,	  EIO,	  ENOSPC, EIO,	   /* 25..29 */
  EIO,	  EIO,	  EACCES, EACCES, EIO,	   /* 30..34 */
  EIO,	  EIO,	  EIO,	  EIO,	  ENOSPC,  /* 35..39 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 40..44 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 45..49 */
  EIO,	  EIO,	  EIO,	  EIO,	  EBUSY,   /* 50..54 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 55..59 */
  EIO,	  ENOSPC, ENOSPC, EIO,	  EIO,	   /* 60..64 */
  EACCES, EIO,	  EIO,	  EIO,	  EIO,	   /* 65..69 */
  EIO,	  EIO,	  EIO,	  EROFS,  EIO,	   /* 70..74 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 75..79 */
  EEXIST, EIO,	  ENOENT, EIO,	  EIO,	   /* 80..84 */
  EIO,	  EIO,	  EINVAL, EIO,	  EAGAIN,  /* 85..89 */
  EIO,	  EIO,	  EIO,	  EIO,	  EIO,	   /* 90..94 */
  EINTR,  EIO,	  EIO,	  EIO,	  EACCES,  /* 95..99 */
  ENOMEM, EINVAL, EINVAL, ENOMEM, EINVAL,  /* 100..104 */
  EINVAL, ENOMEM, EIO,	  EACCES, EPIPE,   /* 105..109 */
  ENOENT, E2BIG,  ENOSPC, ENOMEM, EBADF,   /* 110..114 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 115..119 */
  EINVAL, EINVAL, EINVAL, ENOENT, EINVAL,  /* 120..124 */
  ENOENT, ENOENT, ENOENT, ECHILD, ECHILD,  /* 125..129 */
  EACCES, EINVAL, ESPIPE, EINVAL, EINVAL,  /* 130..134 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 135..139 */
  EINVAL, EINVAL, EBUSY,  EINVAL, EINVAL,  /* 140..144 */
  EINVAL, EINVAL, EINVAL, EBUSY,  EINVAL,  /* 145..149 */
  EINVAL, EINVAL, ENOMEM, EINVAL, EINVAL,  /* 150..154 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 155..159 */
  EINVAL, EINVAL, EINVAL, EINVAL, EAGAIN,  /* 160..164 */
  EINVAL, EINVAL, EACCES, EINVAL, EINVAL,  /* 165..169 */
  EBUSY,  EINVAL, EINVAL, EINVAL, EINVAL,  /* 170..174 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 175..179 */
  EINVAL, EINVAL, EINVAL, EINVAL, ECHILD,  /* 180..184 */
  EINVAL, EINVAL, ENOENT, EINVAL, EINVAL,  /* 185..189 */
  ENOEXEC,ENOEXEC,ENOEXEC,ENOEXEC,ENOEXEC, /* 190..194 */
  ENOEXEC,ENOEXEC,ENOEXEC,ENOEXEC,ENOEXEC, /* 195..199 */
  ENOEXEC,ENOEXEC,ENOEXEC,ENOENT, EINVAL,  /* 200..204 */
  EINVAL, ENAMETOOLONG, EINVAL, EINVAL, EINVAL,  /* 205..209 */
  EINVAL, EINVAL, EACCES, ENOEXEC,ENOEXEC, /* 210..214 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 215..219 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 220..224 */
  EINVAL, EINVAL, EINVAL, ECHILD, EINVAL,  /* 225..229 */
  EINVAL, EBUSY,  EAGAIN, ENOTCONN, EINVAL, /* 230..234 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 235..239 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 240..244 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 245..249 */
  EACCES, EACCES, EINVAL, ENOENT, EINVAL,  /* 250..254 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 255..259 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 260..264 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 265..269 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 270..274 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 275..279 */
  EINVAL, EINVAL, EINVAL, EINVAL, EEXIST,  /* 280..284 */
  EEXIST, EINVAL, EINVAL, EINVAL, EINVAL,  /* 285..289 */
  ENOMEM, EMFILE, EINVAL, EINVAL, EINVAL,  /* 290..294 */
  EINVAL, EINVAL, EINVAL, EINVAL, EINVAL,  /* 295..299 */
  EINVAL, EBUSY,  EINVAL, ESRCH,  EINVAL,  /* 300..304 */
  ESRCH,  EINVAL, EINVAL, EINVAL, ESRCH,   /* 305..309 */
  EINVAL, ENOMEM, EINVAL, EINVAL, EINVAL,  /* 310..314 */
  EINVAL, E2BIG,  ENOENT, EIO,	  EIO,	   /* 315..319 */
  EINVAL, EINVAL, EINVAL, EINVAL, EAGAIN,  /* 320..324 */
  EINVAL, EINVAL, EINVAL, EIO,	  ENOENT,  /* 325..329 */
  EACCES, EACCES, EACCES, ENOENT, ENOMEM   /* 330..334 */
};

/*
 * Initialize 64bit file access: dynamic load of WSeB API
*/
	    File64bit :: File64bit()
{
   HMODULE hDoscalls;

   if (DosQueryModuleHandle("DOSCALLS", &hDoscalls) != NO_ERROR)
      return;

   if (DosQueryProcAddr(hDoscalls, 981, NULL, (PFN *)&_DosOpenL) != NO_ERROR)
      return;

   if (DosQueryProcAddr(hDoscalls, 988, NULL, (PFN *)&_DosSetFilePtrL) != NO_ERROR) {
      _DosOpenL = NULL;
      return;
   }

   if (DosQueryProcAddr(hDoscalls, 986, NULL, (PFN *)&_DosSetFileLocksL) != NO_ERROR) {
      _DosOpenL = NULL;
      _DosSetFilePtrL = NULL;
      return;
   }
   /* notify success */
#ifdef MYSQL_SERVER
   printf( "WSeB 64bit file API loaded.\n");
#endif
}

void	    _OS2errno( APIRET rc)
{
  if (rc >= sizeof (errno_tab))
    errno = EINVAL;
  else
    errno = errno_tab[rc];
}


longlong _lseek64( int fd, longlong offset, int seektype)
{
  APIRET   rc;
  longlong actual;

  if (_DosSetFilePtrL)
    rc = _DosSetFilePtrL( fd, offset, seektype, &actual);
  else
  {
    ULONG ulActual;
    rc = DosSetFilePtr( fd, (long) offset, seektype, &ulActual);
    actual = ulActual;
  }

  if (!rc)
    return( actual);				/* NO_ERROR */

  _OS2errno( rc);				/* set errno */
  return(-1);					/* seek failed */
}


inline APIRET _SetFileLocksL(HFILE hFile,
			     PFILELOCKL pflUnlock,
			     PFILELOCKL pflLock,
			     ULONG timeout,
			     ULONG flags)
{
  if (_DosSetFileLocksL)
  {
    APIRET rc;
    rc = _DosSetFileLocksL( hFile, pflUnlock, pflLock, timeout, flags);

    /*
      on FAT/HPFS/LAN a INVALID_PARAMETER is returned, seems that
      only JFS can handle >2GB ranges.
    */
    if (rc != 87)
      return rc;
    /* got INVALID_PARAMETER, fallback to standard call */
  }

  FILELOCK flUnlock = { pflUnlock->lOffset, pflUnlock->lRange };
  FILELOCK flLock = { pflLock->lOffset, pflLock->lRange };
  return DosSetFileLocks( hFile, &flUnlock, &flLock, timeout, flags);
}


int  _lock64( int fd, int locktype, my_off_t start,
	      my_off_t length, myf MyFlags)
{
  FILELOCKL LockArea = {0,0}, UnlockArea = {0,0};
  ULONG     readonly = 0;
  APIRET    rc = -1;

  switch (locktype) {
  case F_UNLCK:
    UnlockArea.lOffset = start;
    UnlockArea.lRange = length ? length : LONGLONG_MAX;
    break;

  case F_RDLCK:
  case F_WRLCK:
    LockArea.lOffset = start;
    LockArea.lRange = length ? length : LONGLONG_MAX;
    readonly = (locktype == F_RDLCK ? 1 : 0);
    break;

  default:
    errno = EINVAL;
    rc = -1;
    break;
  }

  if (MyFlags & MY_DONT_WAIT)
  {
    rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly);
    /* printf("fd %d, locktype %d, rc %d (dont_wait)\n", fd, locktype, rc); */
    if (rc == 33) {  /* Lock Violation */

      DBUG_PRINT("info",("Was locked, trying with timeout"));
      rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 1 * 1000, readonly);
      /* printf( "fd %d, locktype %d, rc %d (dont_wait with timeout)\n", fd, locktype, rc); */
    }
  }
  else
  {
    while (rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly) &&
	   (rc == 33))
    {
      printf(".");
      DosSleep(1 * 1000);
    }
    /* printf( "fd %d, locktype %d, rc %d (wait2)\n", fd, locktype, rc); */
  }
  if (!rc)
    return(0);				/* NO_ERROR */
  _OS2errno( rc);				/* set errno */
  return(-1);					/* lock failed */
}


int sopen(const char *name, int oflag, int shflag, int mask)
{
  int	    fail_errno;
  APIRET   rc = 0;
  HFILE    hf = 0;
  ULONG    ulAction = 0;
  LONGLONG cbFile = 0;
  ULONG    ulAttribute = FILE_NORMAL;
  ULONG    fsOpenFlags = 0;
  ULONG    fsOpenMode = 0;

  /* Extract the access mode and sharing mode bits. */
  fsOpenMode = (shflag & 0xFF) | (oflag & 0x03);

  /*
    Translate ERROR_OPEN_FAILED to ENOENT unless O_EXCL is set (see
    below).
  */
  fail_errno = ENOENT;

  /*
    Compute `open_flag' depending on `flags'.  Note that _SO_CREAT is
    set for O_CREAT.
  */

  if (oflag & O_CREAT)
  {
    if (oflag & O_EXCL)
    {
      fsOpenFlags = OPEN_ACTION_FAIL_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW;
      fail_errno = EEXIST;
    }
    else if (oflag & O_TRUNC)
      fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW;
    else
      fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW;

    if (mask & S_IWRITE)
      ulAttribute = FILE_NORMAL;
    else
      ulAttribute = FILE_READONLY;

  }
  else if (oflag & O_TRUNC)
    fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW;
  else
    fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW;

  /* Try to open the file and handle errors. */
  if (_DosOpenL)
    rc = _DosOpenL( name, &hf, &ulAction, cbFile,
		    ulAttribute, fsOpenFlags, fsOpenMode, NULL);
  else
    rc = DosOpen( name, &hf, &ulAction, (LONG) cbFile,
		  ulAttribute, fsOpenFlags, fsOpenMode, NULL);

  if (rc == ERROR_OPEN_FAILED)
  {
    errno = fail_errno;
    return -1;
  }
  if (rc != 0)
  {
    _OS2errno( rc);      /* set errno */
    return -1;
  }
  if (oflag & O_APPEND)
    _lseek64( hf, 0L, SEEK_END);
  return hf;
}


int read(int fd, void *buffer, unsigned int count)
{
  APIRET   rc;
  ULONG    actual;

  rc= DosRead( fd, (PVOID) buffer, count, &actual);

  if (!rc)
    return( actual);				/* NO_ERROR */
  _OS2errno( rc);				/* set errno */
  return(-1);					/* read failed */
}


int write(int fd, const void *buffer, unsigned int count)
{
  APIRET   rc;
  ULONG    actual;

  rc = DosWrite( fd, (PVOID) buffer, count, &actual);

  if (!rc)
    return( actual);				/* NO_ERROR */
  _OS2errno( rc);				/* set errno */
  return(-1);					/* write failed */
}


int close( int fd)
{
  APIRET   rc;
  ULONG    actual;

  rc = DosClose( fd);

  if (!rc)
    return( 0);					/* NO_ERROR */
  _OS2errno( rc);				/* set errno */
  return(-1);					/* close failed */
}


int open( const char *name, int oflag)
{
   return sopen( name, oflag, OPEN_SHARE_DENYNONE, S_IREAD | S_IWRITE);
}


int open( const char *name, int oflag, int mask)
{
   return sopen( name, oflag, OPEN_SHARE_DENYNONE, mask);
}