/*
|
/*
|
* Copyright (c) 1990 The Regents of the University of California.
|
* Copyright (c) 1990 The Regents of the University of California.
|
* All rights reserved.
|
* All rights reserved.
|
*
|
*
|
* Redistribution and use in source and binary forms are permitted
|
* Redistribution and use in source and binary forms are permitted
|
* provided that the above copyright notice and this paragraph are
|
* provided that the above copyright notice and this paragraph are
|
* duplicated in all such forms and that any documentation,
|
* duplicated in all such forms and that any documentation,
|
* advertising materials, and other materials related to such
|
* advertising materials, and other materials related to such
|
* distribution and use acknowledge that the software was developed
|
* distribution and use acknowledge that the software was developed
|
* by the University of California, Berkeley. The name of the
|
* by the University of California, Berkeley. The name of the
|
* University may not be used to endorse or promote products derived
|
* University may not be used to endorse or promote products derived
|
* from this software without specific prior written permission.
|
* from this software without specific prior written permission.
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
*/
|
*/
|
|
|
/*
|
/*
|
FUNCTION
|
FUNCTION
|
<<fgetpos>>---record position in a stream or file
|
<<fgetpos>>---record position in a stream or file
|
|
|
INDEX
|
INDEX
|
fgetpos
|
fgetpos
|
INDEX
|
INDEX
|
_fgetpos_r
|
_fgetpos_r
|
|
|
ANSI_SYNOPSIS
|
ANSI_SYNOPSIS
|
#include <stdio.h>
|
#include <stdio.h>
|
int fgetpos(FILE *<[fp]>, fpos_t *<[pos]>);
|
int fgetpos(FILE *<[fp]>, fpos_t *<[pos]>);
|
int _fgetpos_r(struct _reent *<[ptr]>, FILE *<[fp]>, fpos_t *<[pos]>);
|
int _fgetpos_r(struct _reent *<[ptr]>, FILE *<[fp]>, fpos_t *<[pos]>);
|
|
|
TRAD_SYNOPSIS
|
TRAD_SYNOPSIS
|
#include <stdio.h>
|
#include <stdio.h>
|
int fgetpos(<[fp]>, <[pos]>)
|
int fgetpos(<[fp]>, <[pos]>)
|
FILE *<[fp]>;
|
FILE *<[fp]>;
|
fpos_t *<[pos]>;
|
fpos_t *<[pos]>;
|
|
|
int _fgetpos_r(<[ptr]>, <[fp]>, <[pos]>)
|
int _fgetpos_r(<[ptr]>, <[fp]>, <[pos]>)
|
struct _reent *<[ptr]>;
|
struct _reent *<[ptr]>;
|
FILE *<[fp]>;
|
FILE *<[fp]>;
|
fpos_t *<[pos]>;
|
fpos_t *<[pos]>;
|
|
|
DESCRIPTION
|
DESCRIPTION
|
Objects of type <<FILE>> can have a ``position'' that records how much
|
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
|
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.
|
depend on this position, and many change it as a side effect.
|
|
|
You can use <<fgetpos>> to report on the current position for a file
|
You can use <<fgetpos>> to report on the current position for a file
|
identified by <[fp]>; <<fgetpos>> will write a value
|
identified by <[fp]>; <<fgetpos>> will write a value
|
representing that position at <<*<[pos]>>>. Later, you can
|
representing that position at <<*<[pos]>>>. Later, you can
|
use this value with <<fsetpos>> to return the file to this
|
use this value with <<fsetpos>> to return the file to this
|
position.
|
position.
|
|
|
In the current implementation, <<fgetpos>> simply uses a character
|
In the current implementation, <<fgetpos>> simply uses a character
|
count to represent the file position; this is the same number that
|
count to represent the file position; this is the same number that
|
would be returned by <<ftell>>.
|
would be returned by <<ftell>>.
|
|
|
RETURNS
|
RETURNS
|
<<fgetpos>> returns <<0>> when successful. If <<fgetpos>> fails, the
|
<<fgetpos>> returns <<0>> when successful. If <<fgetpos>> fails, the
|
result is <<1>>. Failure occurs on streams that do not support
|
result is <<1>>. Failure occurs on streams that do not support
|
positioning; the global <<errno>> indicates this condition with the
|
positioning; the global <<errno>> indicates this condition with the
|
value <<ESPIPE>>.
|
value <<ESPIPE>>.
|
|
|
PORTABILITY
|
PORTABILITY
|
<<fgetpos>> is required by the ANSI C standard, but the meaning of the
|
<<fgetpos>> is required by the ANSI C standard, but the meaning of the
|
value it records is not specified beyond requiring that it be
|
value it records is not specified beyond requiring that it be
|
acceptable as an argument to <<fsetpos>>. In particular, other
|
acceptable as an argument to <<fsetpos>>. In particular, other
|
conforming C implementations may return a different result from
|
conforming C implementations may return a different result from
|
<<ftell>> than what <<fgetpos>> writes at <<*<[pos]>>>.
|
<<ftell>> than what <<fgetpos>> writes at <<*<[pos]>>>.
|
|
|
No supporting OS subroutines are required.
|
No supporting OS subroutines are required.
|
*/
|
*/
|
|
|
#include <_ansi.h>
|
#include <_ansi.h>
|
#include <reent.h>
|
#include <reent.h>
|
#include <stdio.h>
|
#include <stdio.h>
|
|
|
int
|
int
|
_DEFUN(_fgetpos_r, (ptr, fp, pos),
|
_DEFUN(_fgetpos_r, (ptr, fp, pos),
|
struct _reent * ptr _AND
|
struct _reent * ptr _AND
|
FILE * fp _AND
|
FILE * fp _AND
|
_fpos_t * pos)
|
_fpos_t * pos)
|
{
|
{
|
*pos = _ftell_r (ptr, fp);
|
*pos = _ftell_r (ptr, fp);
|
|
|
if (*pos != -1)
|
if (*pos != -1)
|
{
|
{
|
return 0;
|
return 0;
|
}
|
}
|
return 1;
|
return 1;
|
}
|
}
|
|
|
#ifndef _REENT_ONLY
|
#ifndef _REENT_ONLY
|
|
|
int
|
int
|
_DEFUN(fgetpos, (fp, pos),
|
_DEFUN(fgetpos, (fp, pos),
|
FILE * fp _AND
|
FILE * fp _AND
|
_fpos_t * pos)
|
_fpos_t * pos)
|
{
|
{
|
return _fgetpos_r (_REENT, fp, pos);
|
return _fgetpos_r (_REENT, fp, pos);
|
}
|
}
|
|
|
#endif /* !_REENT_ONLY */
|
#endif /* !_REENT_ONLY */
|
|
|
