[444] | 1 | /*- |
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| 2 | * Copyright (c) 2002-2004 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 | <<fgetwc>>, <<getwc>>, <<fgetwc_unlocked>>, <<getwc_unlocked>>---get a wide character from a file or stream |
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| 30 | |
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| 31 | INDEX |
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| 32 | fgetwc |
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| 33 | INDEX |
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| 34 | fgetwc_unlocked |
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| 35 | INDEX |
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| 36 | _fgetwc_r |
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| 37 | INDEX |
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| 38 | _fgetwc_unlocked_r |
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| 39 | INDEX |
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| 40 | getwc |
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| 41 | INDEX |
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| 42 | getwc_unlocked |
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| 43 | INDEX |
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| 44 | _getwc_r |
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| 45 | INDEX |
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| 46 | _getwc_unlocked_r |
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| 47 | |
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| 48 | SYNOPSIS |
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| 49 | #include <stdio.h> |
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| 50 | #include <wchar.h> |
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| 51 | wint_t fgetwc(FILE *<[fp]>); |
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| 52 | |
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| 53 | #define _GNU_SOURCE |
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| 54 | #include <stdio.h> |
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| 55 | #include <wchar.h> |
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| 56 | wint_t fgetwc_unlocked(FILE *<[fp]>); |
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| 57 | |
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| 58 | #include <stdio.h> |
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| 59 | #include <wchar.h> |
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| 60 | wint_t _fgetwc_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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| 61 | |
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| 62 | #include <stdio.h> |
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| 63 | #include <wchar.h> |
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| 64 | wint_t _fgetwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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| 65 | |
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| 66 | #include <stdio.h> |
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| 67 | #include <wchar.h> |
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| 68 | wint_t getwc(FILE *<[fp]>); |
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| 69 | |
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| 70 | #define _GNU_SOURCE |
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| 71 | #include <stdio.h> |
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| 72 | #include <wchar.h> |
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| 73 | wint_t getwc_unlocked(FILE *<[fp]>); |
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| 74 | |
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| 75 | #include <stdio.h> |
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| 76 | #include <wchar.h> |
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| 77 | wint_t _getwc_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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| 78 | |
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| 79 | #include <stdio.h> |
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| 80 | #include <wchar.h> |
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| 81 | wint_t _getwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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| 82 | |
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| 83 | DESCRIPTION |
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| 84 | Use <<fgetwc>> to get the next wide character from the file or stream |
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| 85 | identified by <[fp]>. As a side effect, <<fgetwc>> advances the file's |
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| 86 | current position indicator. |
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| 87 | |
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| 88 | <<fgetwc_unlocked>> is a non-thread-safe version of <<fgetwc>>. |
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| 89 | <<fgetwc_unlocked>> may only safely be used within a scope |
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| 90 | protected by flockfile() (or ftrylockfile()) and funlockfile(). This |
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| 91 | function may safely be used in a multi-threaded program if and only |
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| 92 | if they are called while the invoking thread owns the (FILE *) |
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| 93 | object, as is the case after a successful call to the flockfile() or |
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| 94 | ftrylockfile() functions. If threads are disabled, then |
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| 95 | <<fgetwc_unlocked>> is equivalent to <<fgetwc>>. |
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| 96 | |
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| 97 | The <<getwc>> and <<getwc_unlocked>> functions or macros functions identically |
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| 98 | to <<fgetwc>> and <<fgetwc_unlocked>>. It may be implemented as a macro, and |
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| 99 | may evaluate its argument more than once. There is no reason ever to use it. |
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| 100 | |
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| 101 | <<_fgetwc_r>>, <<_getwc_r>>, <<_fgetwc_unlocked_r>>, and <<_getwc_unlocked_r>> |
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| 102 | are simply reentrant versions of the above functions that are passed the |
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| 103 | additional reentrant structure pointer argument: <[ptr]>. |
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| 104 | |
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| 105 | RETURNS |
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| 106 | The next wide character cast to <<wint_t>>, unless there is no more data, |
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| 107 | or the host system reports a read error; in either of these situations, |
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| 108 | <<fgetwc>> and <<getwc>> return <<WEOF>>. |
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| 109 | |
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| 110 | You can distinguish the two situations that cause an <<EOF>> result by |
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| 111 | using the <<ferror>> and <<feof>> functions. |
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| 112 | |
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| 113 | PORTABILITY |
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| 114 | <<fgetwc>> and <<getwc>> are required by C99 and POSIX.1-2001. |
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| 115 | |
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| 116 | <<fgetwc_unlocked>> and <<getwc_unlocked>> are GNU extensions. |
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| 117 | */ |
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| 118 | |
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| 119 | #include <_ansi.h> |
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| 120 | #include <reent.h> |
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| 121 | #include <errno.h> |
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| 122 | #include <stdio.h> |
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| 123 | #include <stdlib.h> |
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| 124 | #include <wchar.h> |
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| 125 | #include "local.h" |
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| 126 | |
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| 127 | wint_t |
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| 128 | __fgetwc (struct _reent *ptr, |
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| 129 | register FILE *fp) |
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| 130 | { |
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| 131 | wchar_t wc; |
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| 132 | size_t nconv; |
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| 133 | |
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| 134 | if (fp->_r <= 0 && __srefill_r (ptr, fp)) |
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| 135 | return (WEOF); |
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| 136 | if (MB_CUR_MAX == 1) |
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| 137 | { |
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| 138 | /* Fast path for single-byte encodings. */ |
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| 139 | wc = *fp->_p++; |
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| 140 | fp->_r--; |
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| 141 | return (wc); |
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| 142 | } |
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| 143 | do |
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| 144 | { |
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| 145 | nconv = _mbrtowc_r (ptr, &wc, (char *) fp->_p, fp->_r, &fp->_mbstate); |
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| 146 | if (nconv == (size_t)-1) |
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| 147 | break; |
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| 148 | else if (nconv == (size_t)-2) |
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| 149 | continue; |
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| 150 | else if (nconv == 0) |
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| 151 | { |
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| 152 | /* |
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| 153 | * Assume that the only valid representation of |
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| 154 | * the null wide character is a single null byte. |
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| 155 | */ |
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| 156 | fp->_p++; |
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| 157 | fp->_r--; |
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| 158 | return (L'\0'); |
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| 159 | } |
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| 160 | else |
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| 161 | { |
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| 162 | fp->_p += nconv; |
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| 163 | fp->_r -= nconv; |
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| 164 | return (wc); |
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| 165 | } |
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| 166 | } |
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| 167 | while (__srefill_r(ptr, fp) == 0); |
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| 168 | fp->_flags |= __SERR; |
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| 169 | errno = EILSEQ; |
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| 170 | return (WEOF); |
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| 171 | } |
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| 172 | |
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| 173 | wint_t |
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| 174 | _fgetwc_r (struct _reent *ptr, |
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| 175 | register FILE *fp) |
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| 176 | { |
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| 177 | wint_t r; |
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| 178 | |
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| 179 | _newlib_flockfile_start (fp); |
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| 180 | ORIENT(fp, 1); |
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| 181 | r = __fgetwc (ptr, fp); |
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| 182 | _newlib_flockfile_end (fp); |
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| 183 | return r; |
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| 184 | } |
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| 185 | |
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| 186 | wint_t |
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| 187 | fgetwc (FILE *fp) |
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| 188 | { |
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| 189 | struct _reent *reent = _REENT; |
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| 190 | |
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| 191 | CHECK_INIT(reent, fp); |
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| 192 | return _fgetwc_r (reent, fp); |
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| 193 | } |
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