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/* 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);
}
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