110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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FUNCTION
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<<getwchar>>, <<getwchar_unlocked>>---read a wide character from standard input
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INDEX
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getwchar
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INDEX
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getwchar_unlocked
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INDEX
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_getwchar_r
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INDEX
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_getwchar_unlocked_r
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SYNOPSIS
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#include <wchar.h>
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wint_t getwchar(void);
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#define _GNU_SOURCE
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#include <wchar.h>
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wint_t getwchar_unlocked(void);
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#include <wchar.h>
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wint_t _getwchar_r(struct _reent *<[reent]>);
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#include <wchar.h>
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wint_t _getwchar_unlocked_r(struct _reent *<[reent]>);
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DESCRIPTION
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<<getwchar>> function or macro is the wide character equivalent of
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the <<getchar>> function. You can use <<getwchar>> to get the next
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wide character from the standard input stream. As a side effect,
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<<getwchar>> advances the standard input's current position indicator.
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<<getwchar_unlocked>> is a non-thread-safe version of <<getwchar>>.
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<<getwchar_unlocked>> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the (FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<<getwchar_unlocked>> is equivalent to <<getwchar>>.
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The alternate functions <<_getwchar_r>> and <<_getwchar_unlocked_r>> are
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reentrant versions of the above. The extra argument <[reent]> is a pointer to
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a reentrancy structure.
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RETURNS
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The next wide character cast to <<wint_t>>, unless there is no more
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data, or the host system reports a read error; in either of these
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situations, <<getwchar>> returns <<WEOF>>.
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You can distinguish the two situations that cause an <<WEOF>> result by
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using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.
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PORTABILITY
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<<getwchar>> is required by C99.
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<<getwchar_unlocked>> is a GNU extension.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <wchar.h>
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#include "local.h"
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#undef getwchar
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wint_t
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_getwchar_r (struct _reent *ptr)
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{
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return _fgetwc_r (ptr, stdin);
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}
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/*
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* Synonym for fgetwc(stdin).
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*/
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wint_t
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getwchar (void)
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{
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_REENT_SMALL_CHECK_INIT (_REENT);
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return fgetwc (stdin);
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}
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