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/*

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);

  _flockfile (fp);

  if (mode != 0) {

    ORIENT (fp, mode);

  }

  if (!(fp->_flags & __SORD))

    ret = 0;

  else

    ret = (fp->_flags2 & __SWID) ? 1 : -1;

  _funlockfile (fp);

  return ret;

}

int

_DEFUN(fwide, (fp, mode),

        FILE *fp _AND

        int mode)

{

  return _fwide_r (_REENT, fp, mode);

}