mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
|
|
FUNCTION
|
|
<<fwide>>---set and determine the orientation of a FILE stream
|
|
|
|
INDEX
|
|
fwide
|
|
INDEX
|
|
_fwide_r
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <wchar.h>
|
|
int fwide(FILE *<[fp]>, int <[mode]>);
|
|
|
|
int _fwide_r(struct _reent *<[ptr]>, FILE *<[fp]>, int <[mode]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <wchar.h>
|
|
int fwide(<[fp]>, <[mode]>);
|
|
FILE *<[fp]>;
|
|
int <[mode]>;
|
|
|
|
int _fwide_r(<[ptr]>, <[fp]>, <[mode]>);
|
|
struct _reent *<[ptr]>;
|
|
FILE *<[fp]>;
|
|
int <[mode]>;
|
|
|
|
DESCRIPTION
|
|
When <[mode]> is zero, the <<fwide>> function determines the current
|
|
orientation of <[fp]>. It returns a value > 0 if <[fp]> is
|
|
wide-character oriented, i.e. if wide character I/O is permitted but
|
|
char I/O is disallowed. It returns a value < 0 if <[fp]> is byte
|
|
oriented, i.e. if char I/O is permitted but wide character I/O is
|
|
disallowed. It returns zero if <[fp]> has no orientation yet; in
|
|
this case the next I/O operation might change the orientation (to byte
|
|
oriented if it is a char I/O operation, or to wide-character oriented
|
|
if it is a wide character I/O operation).
|
|
|
|
Once a stream has an orientation, it cannot be changed and persists
|
|
until the stream is closed, unless the stream is re-opened with freopen,
|
|
which removes the orientation of the stream.
|
|
|
|
When <[mode]> is non-zero, the <<fwide>> function first attempts to set
|
|
<[fp]>'s orientation (to wide-character oriented if <[mode]> > 0, or to
|
|
byte oriented if <[mode]> < 0). It then returns a value denoting the
|
|
current orientation, as above.
|
|
|
|
RETURNS
|
|
The <<fwide>> function returns <[fp]>'s orientation, after possibly
|
|
changing it. A return value > 0 means wide-character oriented. A return
|
|
value < 0 means byte oriented. A return value of zero means undecided.
|
|
|
|
PORTABILITY
|
|
C99, POSIX.1-2001.
|
|
|
|
*/
|
|
|
|
#include <_ansi.h>
|
|
#include <wchar.h>
|
|
#include "local.h"
|
|
|
|
int
|
|
_DEFUN(_fwide_r, (ptr, fp, mode),
|
|
struct _reent *ptr _AND
|
|
FILE *fp _AND
|
|
int mode)
|
|
{
|
|
int ret;
|
|
|
|
CHECK_INIT(ptr, fp);
|
|
|
|
_newlib_flockfile_start (fp);
|
|
if (mode != 0) {
|
|
ORIENT (fp, mode);
|
|
}
|
|
if (!(fp->_flags & __SORD))
|
|
ret = 0;
|
|
else
|
|
ret = (fp->_flags2 & __SWID) ? 1 : -1;
|
|
_newlib_flockfile_end (fp);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
_DEFUN(fwide, (fp, mode),
|
|
FILE *fp _AND
|
|
int mode)
|
|
{
|
|
return _fwide_r (_REENT, fp, mode);
|
|
}
|