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/*
FUNCTION
<<fgetpos64>>---record position in a large stream or file
INDEX
fgetpos64
INDEX
_fgetpos64_r
ANSI_SYNOPSIS
#include <stdio.h>
int fgetpos64(FILE *<[fp]>, _fpos64_t *<[pos]>);
int _fgetpos64_r(struct _reent *<[ptr]>, FILE *<[fp]>,
_fpos64_t *<[pos]>);
TRAD_SYNOPSIS
#include <stdio.h>
int fgetpos64(<[fp]>, <[pos]>)
FILE *<[fp]>;
_fpos64_t *<[pos]>;
int _fgetpos64_r(<[ptr]>, <[fp]>, <[pos]>)
FILE *<[fp]>;
_fpos64_t *<[pos]>;
DESCRIPTION
Objects of type <<FILE>> can have a ``position'' that records how much
of the file your program has already read. Many of the <<stdio>> functions
depend on this position, and many change it as a side effect.
You can use <<fgetpos64>> to report on the current position for a file
identified by <[fp]> that was opened by <<fopen64>>; <<fgetpos>> will write
a value representing that position at <<*<[pos]>>>. Later, you can
use this value with <<fsetpos64>> to return the file to this
position.
In the current implementation, <<fgetpos64>> simply uses a character
count to represent the file position; this is the same number that
would be returned by <<ftello64>>.
RETURNS
<<fgetpos64>> returns <<0>> when successful. If <<fgetpos64>> fails, the
result is <<1>>. Failure occurs on streams that do not support
positioning or streams not opened via <<fopen64>>; the global <<errno>>
indicates these conditions with the value <<ESPIPE>>.
PORTABILITY
<<fgetpos64>> is a glibc extension.
No supporting OS subroutines are required.
*/
#include <stdio.h>
#ifdef __LARGE64_FILES
int
_DEFUN (_fgetpos64_r, (ptr, fp, pos),
struct _reent * ptr _AND
FILE * fp _AND
_fpos64_t * pos)
{
*pos = (_fpos64_t)_ftello64_r (ptr, fp);
if (*pos != -1)
{
return 0;
}
return 1;
}
#ifndef _REENT_ONLY
int
_DEFUN (fgetpos64, (fp, pos),
FILE * fp _AND
_fpos64_t * pos)
{
return _fgetpos64_r (_REENT, fp, pos);
}
#endif /* !_REENT_ONLY */
#endif /* __LARGE64_FILES */
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