Subversion Repositories or1k_old

/* No user fns here.  Pesch 15apr92. */

/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

#include <stdio.h>

#include <sys/types.h>

#include <fcntl.h>

#include <sys/unistd.h>

#include "local.h"

/*

 * Small standard I/O/seek/close functions.

 * These maintain the `known seek offset' for seek optimisation.

 */

int

__sread (cookie, buf, n)

     _PTR cookie;

     char *buf;

     int n;

{

  register FILE *fp = (FILE *) cookie;

  register int ret;

  ret = _read_r (fp->_data, fp->_file, buf, n);

  /* If the read succeeded, update the current offset.  */

  if (ret >= 0)

    fp->_offset += ret;

  else

    fp->_flags &= ~__SOFF;      /* paranoia */

  return ret;

}

int

__swrite (cookie, buf, n)

     _PTR cookie;

     char _CONST *buf;

     int n;

{

  register FILE *fp = (FILE *) cookie;

  if (fp->_flags & __SAPP)

    (void) _lseek_r (fp->_data, fp->_file, (off_t) 0, SEEK_END);

  fp->_flags &= ~__SOFF;        /* in case O_APPEND mode is set */

  return _write_r (fp->_data, fp->_file, buf, n);

}

fpos_t

__sseek (cookie, offset, whence)

     _PTR cookie;

     fpos_t offset;

     int whence;

{

  register FILE *fp = (FILE *) cookie;

  register off_t ret;

  ret = _lseek_r (fp->_data, fp->_file, (off_t) offset, whence);

  if (ret == -1L)

    fp->_flags &= ~__SOFF;

  else

    {

      fp->_flags |= __SOFF;

      fp->_offset = ret;

    }

  return ret;

}

int

__sclose (cookie)

     _PTR cookie;

{

  FILE *fp = (FILE *) cookie;

  return _close_r (fp->_data, fp->_file);

}