1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*-
* 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
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]>);
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
_getwchar_r (struct _reent *ptr)
{
return _fgetwc_r (ptr, stdin);
}
/*
* Synonym for fgetwc(stdin).
*/
wint_t
getwchar (void)
{
_REENT_SMALL_CHECK_INIT (_REENT);
return fgetwc (stdin);
}
|
