[444] | 1 | /*- |
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| 2 | * Copyright (c) 2002 Tim J. Robbins. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 24 | * SUCH DAMAGE. |
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| 25 | */ |
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| 26 | |
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| 27 | /* |
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| 28 | FUNCTION |
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| 29 | <<getwchar>>, <<getwchar_unlocked>>---read a wide character from standard input |
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| 30 | |
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| 31 | INDEX |
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| 32 | getwchar |
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| 33 | INDEX |
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| 34 | getwchar_unlocked |
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| 35 | INDEX |
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| 36 | _getwchar_r |
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| 37 | INDEX |
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| 38 | _getwchar_unlocked_r |
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| 39 | |
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| 40 | SYNOPSIS |
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| 41 | #include <wchar.h> |
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| 42 | wint_t getwchar(void); |
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| 43 | |
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| 44 | #define _GNU_SOURCE |
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| 45 | #include <wchar.h> |
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| 46 | wint_t getwchar_unlocked(void); |
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| 47 | |
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| 48 | #include <wchar.h> |
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| 49 | wint_t _getwchar_r(struct _reent *<[reent]>); |
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| 50 | |
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| 51 | #include <wchar.h> |
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| 52 | wint_t _getwchar_unlocked_r(struct _reent *<[reent]>); |
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| 53 | |
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| 54 | DESCRIPTION |
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| 55 | <<getwchar>> function or macro is the wide character equivalent of |
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| 56 | the <<getchar>> function. You can use <<getwchar>> to get the next |
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| 57 | wide character from the standard input stream. As a side effect, |
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| 58 | <<getwchar>> advances the standard input's current position indicator. |
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| 59 | |
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| 60 | <<getwchar_unlocked>> is a non-thread-safe version of <<getwchar>>. |
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| 61 | <<getwchar_unlocked>> may only safely be used within a scope |
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| 62 | protected by flockfile() (or ftrylockfile()) and funlockfile(). This |
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| 63 | function may safely be used in a multi-threaded program if and only |
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| 64 | if they are called while the invoking thread owns the (FILE *) |
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| 65 | object, as is the case after a successful call to the flockfile() or |
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| 66 | ftrylockfile() functions. If threads are disabled, then |
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| 67 | <<getwchar_unlocked>> is equivalent to <<getwchar>>. |
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| 68 | |
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| 69 | The alternate functions <<_getwchar_r>> and <<_getwchar_unlocked_r>> are |
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| 70 | reentrant versions of the above. The extra argument <[reent]> is a pointer to |
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| 71 | a reentrancy structure. |
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| 72 | |
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| 73 | RETURNS |
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| 74 | The next wide character cast to <<wint_t>>, unless there is no more |
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| 75 | data, or the host system reports a read error; in either of these |
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| 76 | situations, <<getwchar>> returns <<WEOF>>. |
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| 77 | |
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| 78 | You can distinguish the two situations that cause an <<WEOF>> result by |
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| 79 | using `<<ferror(stdin)>>' and `<<feof(stdin)>>'. |
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| 80 | |
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| 81 | PORTABILITY |
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| 82 | <<getwchar>> is required by C99. |
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| 83 | |
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| 84 | <<getwchar_unlocked>> is a GNU extension. |
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| 85 | */ |
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| 86 | |
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| 87 | #include <_ansi.h> |
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| 88 | #include <reent.h> |
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| 89 | #include <stdio.h> |
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| 90 | #include <wchar.h> |
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| 91 | #include "local.h" |
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| 92 | |
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| 93 | #undef getwchar |
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| 94 | |
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| 95 | wint_t |
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| 96 | _getwchar_r (struct _reent *ptr) |
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| 97 | { |
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| 98 | return _fgetwc_r (ptr, stdin); |
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| 99 | } |
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| 100 | |
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| 101 | /* |
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| 102 | * Synonym for fgetwc(stdin). |
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| 103 | */ |
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| 104 | wint_t |
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| 105 | getwchar (void) |
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| 106 | { |
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| 107 | _REENT_SMALL_CHECK_INIT (_REENT); |
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| 108 | return fgetwc (stdin); |
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| 109 | } |
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