newlib: wide char support

git-svn-id: svn://kolibrios.org@6607 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdio/getwchar.c

@@ -0,0 +1,126 @@
+/*-
+ * Copyright (c) 2002 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
+<<getwchar>>, <<getwchar_unlocked>>---read a wide character from standard input
+
+INDEX
+	getwchar
+INDEX
+	getwchar_unlocked
+INDEX
+	_getwchar_r
+INDEX
+	_getwchar_unlocked_r
+
+ANSI_SYNOPSIS
+	#include <wchar.h>
+	wint_t getwchar(void);
+
+	#define _GNU_SOURCE
+	#include <wchar.h>
+	wint_t getwchar_unlocked(void);
+
+	#include <wchar.h>
+	wint_t _getwchar_r(struct _reent *<[reent]>);
+
+	#include <wchar.h>
+	wint_t _getwchar_unlocked_r(struct _reent *<[reent]>);
+
+TRAD_SYNOPSIS
+	#include <wchar.h>
+	wint_t getwchar();
+
+	#define _GNU_SOURCE
+	#include <wchar.h>
+	wint_t getwchar_unlocked();
+
+	#include <wchar.h>
+	wint_t _getwchar_r(<[reent]>)
+	char * <[reent]>;
+
+	#include <wchar.h>
+	wint_t _getwchar_unlocked_r(<[reent]>)
+	char * <[reent]>;
+
+DESCRIPTION
+<<getwchar>> function or macro is the wide character equivalent of
+the <<getchar>> function.  You can use <<getwchar>> to get the next
+wide character from the standard input stream.  As a side effect,
+<<getwchar>> advances the standard input's current position indicator.
+
+<<getwchar_unlocked>> is a non-thread-safe version of <<getwchar>>.
+<<getwchar_unlocked>> may only safely be used within a scope
+protected by flockfile() (or ftrylockfile()) and funlockfile().  This
+function may safely be used in a multi-threaded program if and only
+if they are called while the invoking thread owns the (FILE *)
+object, as is the case after a successful call to the flockfile() or
+ftrylockfile() functions.  If threads are disabled, then
+<<getwchar_unlocked>> is equivalent to <<getwchar>>.
+
+The alternate functions <<_getwchar_r>> and <<_getwchar_unlocked_r>> are
+reentrant versions of the above.  The extra argument <[reent]> is a pointer to
+a reentrancy structure.
+
+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, <<getwchar>> returns <<WEOF>>.
+
+You can distinguish the two situations that cause an <<WEOF>> result by
+using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.
+
+PORTABILITY
+<<getwchar>> is required by C99.
+
+<<getwchar_unlocked>> is a GNU extension.
+*/
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+#include <wchar.h>
+#include "local.h"
+
+#undef getwchar
+
+wint_t
+_DEFUN (_getwchar_r, (ptr),
+	struct _reent *ptr)
+{
+  return _fgetwc_r (ptr, stdin);
+}
+
+/*
+ * Synonym for fgetwc(stdin).
+ */
+wint_t
+_DEFUN_VOID (getwchar)
+{
+  _REENT_SMALL_CHECK_INIT (_REENT);
+  return fgetwc (stdin);
+}