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/*-

 * Copyright (c) 2002-2004 Tim J. Robbins.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

/*

FUNCTION

<<fgetwc>>, <<getwc>>---get a wide character from a file or stream

INDEX

        fgetwc

INDEX

        _fgetwc_r

INDEX

        getwc

INDEX

        _getwc_r

ANSI_SYNOPSIS

        #include <stdio.h>

        #include <wchar.h>

        wint_t fgetwc(FILE *<[fp]>);

        #include <stdio.h>

        #include <wchar.h>

        wint_t _fgetwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);

        #include <stdio.h>

        #include <wchar.h>

        wint_t getwc(FILE *<[fp]>);

        #include <stdio.h>

        #include <wchar.h>

        wint_t _getwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        #include <wchar.h>

        wint_t fgetwc(<[fp]>)

        FILE *<[fp]>;

        #include <stdio.h>

        #include <wchar.h>

        wint_t _fgetwc_r(<[ptr]>, <[fp]>)

        struct _reent *<[ptr]>;

        FILE *<[fp]>;

        #include <stdio.h>

        #include <wchar.h>

        wint_t getwc(<[fp]>)

        FILE *<[fp]>;

        #include <stdio.h>

        #include <wchar.h>

        wint_t _getwc_r(<[ptr]>, <[fp]>)

        struct _reent *<[ptr]>;

        FILE *<[fp]>;

DESCRIPTION

Use <<fgetwc>> to get the next wide character from the file or stream

identified by <[fp]>.  As a side effect, <<fgetwc>> advances the file's

current position indicator.

The  <<getwc>>  function  or macro functions identically to <<fgetwc>>.  It

may be implemented as a macro, and may evaluate its argument more  than

once. There is no reason ever to use it.

<<_fgetwc_r>> and <<_getwc_r>> are simply reentrant versions of

<<fgetwc>> and <<getwc>> that are passed the additional reentrant

structure pointer argument: <[ptr]>.

RETURNS

The next wide character cast to <<wint_t>>), unless there is no more data,

or the host system reports a read error; in either of these situations,

<<fgetwc>> and <<getwc>> return <<WEOF>>.

You can distinguish the two situations that cause an <<EOF>> result by

using the <<ferror>> and <<feof>> functions.

PORTABILITY

C99, POSIX.1-2001

*/

#include <_ansi.h>

#include <reent.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <wchar.h>

#include "local.h"

static wint_t

_DEFUN(__fgetwc, (ptr, fp),

        struct _reent *ptr _AND

        register FILE *fp)

{

  wchar_t wc;

  size_t nconv;

  if (fp->_r <= 0 && __srefill_r (ptr, fp))

    return (WEOF);

  if (MB_CUR_MAX == 1)

    {

      /* Fast path for single-byte encodings. */

      wc = *fp->_p++;

      fp->_r--;

      return (wc);

    }

  do

    {

      nconv = _mbrtowc_r (ptr, &wc, fp->_p, fp->_r, &fp->_mbstate);

      if (nconv == (size_t)-1)

        break;

      else if (nconv == (size_t)-2)

        continue;

      else if (nconv == 0)

        {

          /*

           * Assume that the only valid representation of

           * the null wide character is a single null byte.

           */

          fp->_p++;

          fp->_r--;

          return (L'\0');

        }

      else

        {

          fp->_p += nconv;

          fp->_r -= nconv;

          return (wc);

        }

    }

  while (__srefill_r(ptr, fp) == 0);

  fp->_flags |= __SERR;

  errno = EILSEQ;

  return (WEOF);

}

wint_t

_DEFUN(_fgetwc_r, (ptr, fp),

        struct _reent *ptr _AND

        register FILE *fp)

{

  wint_t r;

  _flockfile (fp);

  ORIENT(fp, 1);

  r = __fgetwc (ptr, fp);

  _funlockfile (fp);

  return r;

}

wint_t

_DEFUN(fgetwc, (fp),

        FILE *fp)

{

  CHECK_INIT(_REENT, fp);

  return _fgetwc_r (_REENT, fp);

}