| 1 | /* Multibyte character data type.
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| 2 | Copyright (C) 2001, 2005-2007, 2009-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>. */
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| 18 |
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| 19 | /* A multibyte character is a short subsequence of a char* string,
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| 20 | representing a single wide character.
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| 21 |
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| 22 | We use multibyte characters instead of wide characters because of
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| 23 | the following goals:
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| 24 | 1) correct multibyte handling, i.e. operate according to the LC_CTYPE
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| 25 | locale,
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| 26 | 2) ease of maintenance, i.e. the maintainer needs not know all details
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| 27 | of the ISO C 99 standard,
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| 28 | 3) don't fail grossly if the input is not in the encoding set by the
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| 29 | locale, because often different encodings are in use in the same
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| 30 | countries (ISO-8859-1/UTF-8, EUC-JP/Shift_JIS, ...),
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| 31 | 4) fast in the case of ASCII characters,
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| 32 | 5) portability, i.e. don't make unportable assumptions about wchar_t.
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| 33 |
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| 34 | Multibyte characters are only accessed through the mb* macros.
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| 35 |
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| 36 | mb_ptr (mbc)
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| 37 | return a pointer to the beginning of the multibyte sequence.
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| 38 |
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| 39 | mb_len (mbc)
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| 40 | returns the number of bytes occupied by the multibyte sequence.
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| 41 | Always > 0.
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| 42 |
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| 43 | mb_iseq (mbc, sc)
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| 44 | returns true if mbc is the standard ASCII character sc.
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| 45 |
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| 46 | mb_isnul (mbc)
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| 47 | returns true if mbc is the nul character.
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| 48 |
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| 49 | mb_cmp (mbc1, mbc2)
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| 50 | returns a positive, zero, or negative value depending on whether mbc1
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| 51 | sorts after, same or before mbc2.
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| 52 |
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| 53 | mb_casecmp (mbc1, mbc2)
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| 54 | returns a positive, zero, or negative value depending on whether mbc1
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| 55 | sorts after, same or before mbc2, modulo upper/lowercase conversion.
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| 56 |
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| 57 | mb_equal (mbc1, mbc2)
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| 58 | returns true if mbc1 and mbc2 are equal.
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| 59 |
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| 60 | mb_caseequal (mbc1, mbc2)
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| 61 | returns true if mbc1 and mbc2 are equal modulo upper/lowercase conversion.
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| 62 |
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| 63 | mb_isalnum (mbc)
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| 64 | returns true if mbc is alphanumeric.
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| 65 |
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| 66 | mb_isalpha (mbc)
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| 67 | returns true if mbc is alphabetic.
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| 68 |
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| 69 | mb_isascii(mbc)
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| 70 | returns true if mbc is plain ASCII.
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| 71 |
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| 72 | mb_isblank (mbc)
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| 73 | returns true if mbc is a blank.
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| 74 |
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| 75 | mb_iscntrl (mbc)
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| 76 | returns true if mbc is a control character.
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| 77 |
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| 78 | mb_isdigit (mbc)
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| 79 | returns true if mbc is a decimal digit.
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| 80 |
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| 81 | mb_isgraph (mbc)
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| 82 | returns true if mbc is a graphic character.
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| 83 |
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| 84 | mb_islower (mbc)
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| 85 | returns true if mbc is lowercase.
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| 86 |
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| 87 | mb_isprint (mbc)
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| 88 | returns true if mbc is a printable character.
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| 89 |
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| 90 | mb_ispunct (mbc)
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| 91 | returns true if mbc is a punctuation character.
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| 92 |
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| 93 | mb_isspace (mbc)
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| 94 | returns true if mbc is a space character.
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| 95 |
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| 96 | mb_isupper (mbc)
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| 97 | returns true if mbc is uppercase.
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| 98 |
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| 99 | mb_isxdigit (mbc)
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| 100 | returns true if mbc is a hexadecimal digit.
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| 101 |
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| 102 | mb_width (mbc)
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| 103 | returns the number of columns on the output device occupied by mbc.
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| 104 | Always >= 0.
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| 105 |
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| 106 | mb_putc (mbc, stream)
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| 107 | outputs mbc on stream, a byte oriented FILE stream opened for output.
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| 108 |
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| 109 | mb_setascii (&mbc, sc)
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| 110 | assigns the standard ASCII character sc to mbc.
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| 111 |
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| 112 | mb_copy (&destmbc, &srcmbc)
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| 113 | copies srcmbc to destmbc.
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| 114 |
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| 115 | Here are the function prototypes of the macros.
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| 116 |
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| 117 | extern const char * mb_ptr (const mbchar_t mbc);
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| 118 | extern size_t mb_len (const mbchar_t mbc);
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| 119 | extern bool mb_iseq (const mbchar_t mbc, char sc);
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| 120 | extern bool mb_isnul (const mbchar_t mbc);
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| 121 | extern int mb_cmp (const mbchar_t mbc1, const mbchar_t mbc2);
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| 122 | extern int mb_casecmp (const mbchar_t mbc1, const mbchar_t mbc2);
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| 123 | extern bool mb_equal (const mbchar_t mbc1, const mbchar_t mbc2);
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| 124 | extern bool mb_caseequal (const mbchar_t mbc1, const mbchar_t mbc2);
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| 125 | extern bool mb_isalnum (const mbchar_t mbc);
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| 126 | extern bool mb_isalpha (const mbchar_t mbc);
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| 127 | extern bool mb_isascii (const mbchar_t mbc);
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| 128 | extern bool mb_isblank (const mbchar_t mbc);
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| 129 | extern bool mb_iscntrl (const mbchar_t mbc);
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| 130 | extern bool mb_isdigit (const mbchar_t mbc);
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| 131 | extern bool mb_isgraph (const mbchar_t mbc);
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| 132 | extern bool mb_islower (const mbchar_t mbc);
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| 133 | extern bool mb_isprint (const mbchar_t mbc);
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| 134 | extern bool mb_ispunct (const mbchar_t mbc);
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| 135 | extern bool mb_isspace (const mbchar_t mbc);
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| 136 | extern bool mb_isupper (const mbchar_t mbc);
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| 137 | extern bool mb_isxdigit (const mbchar_t mbc);
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| 138 | extern int mb_width (const mbchar_t mbc);
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| 139 | extern void mb_putc (const mbchar_t mbc, FILE *stream);
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| 140 | extern void mb_setascii (mbchar_t *new, char sc);
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| 141 | extern void mb_copy (mbchar_t *new, const mbchar_t *old);
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| 142 | */
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| 143 |
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| 144 | #ifndef _MBCHAR_H
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| 145 | #define _MBCHAR_H 1
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| 146 |
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| 147 | #include <stdbool.h>
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| 148 | #include <string.h>
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| 149 | #include <wchar.h>
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| 150 | #include <wctype.h>
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| 151 |
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| 152 | #ifndef _GL_INLINE_HEADER_BEGIN
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| 153 | #error "Please include config.h first."
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| 154 | #endif
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| 155 | _GL_INLINE_HEADER_BEGIN
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| 156 | #ifndef MBCHAR_INLINE
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| 157 | # define MBCHAR_INLINE _GL_INLINE
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| 158 | #endif
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| 159 |
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| 160 | #define MBCHAR_BUF_SIZE 24
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| 161 |
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| 162 | struct mbchar
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| 163 | {
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| 164 | const char *ptr; /* pointer to current character */
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| 165 | size_t bytes; /* number of bytes of current character, > 0 */
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| 166 | bool wc_valid; /* true if wc is a valid wide character */
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| 167 | wchar_t wc; /* if wc_valid: the current character */
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| 168 | char buf[MBCHAR_BUF_SIZE]; /* room for the bytes, used for file input only */
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| 169 | };
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| 170 |
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| 171 | /* EOF (not a real character) is represented with bytes = 0 and
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| 172 | wc_valid = false. */
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| 173 |
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| 174 | typedef struct mbchar mbchar_t;
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| 175 |
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| 176 | /* Access the current character. */
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| 177 | #define mb_ptr(mbc) ((mbc).ptr)
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| 178 | #define mb_len(mbc) ((mbc).bytes)
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| 179 |
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| 180 | /* Comparison of characters. */
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| 181 | #define mb_iseq(mbc, sc) ((mbc).wc_valid && (mbc).wc == (sc))
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| 182 | #define mb_isnul(mbc) ((mbc).wc_valid && (mbc).wc == 0)
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| 183 | #define mb_cmp(mbc1, mbc2) \
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| 184 | ((mbc1).wc_valid \
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| 185 | ? ((mbc2).wc_valid \
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| 186 | ? (int) (mbc1).wc - (int) (mbc2).wc \
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| 187 | : -1) \
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| 188 | : ((mbc2).wc_valid \
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| 189 | ? 1 \
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| 190 | : (mbc1).bytes == (mbc2).bytes \
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| 191 | ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
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| 192 | : (mbc1).bytes < (mbc2).bytes \
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| 193 | ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
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| 194 | : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
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| 195 | #define mb_casecmp(mbc1, mbc2) \
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| 196 | ((mbc1).wc_valid \
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| 197 | ? ((mbc2).wc_valid \
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| 198 | ? (int) towlower ((mbc1).wc) - (int) towlower ((mbc2).wc) \
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| 199 | : -1) \
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| 200 | : ((mbc2).wc_valid \
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| 201 | ? 1 \
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| 202 | : (mbc1).bytes == (mbc2).bytes \
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| 203 | ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
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| 204 | : (mbc1).bytes < (mbc2).bytes \
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| 205 | ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
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| 206 | : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
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| 207 | #define mb_equal(mbc1, mbc2) \
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| 208 | ((mbc1).wc_valid && (mbc2).wc_valid \
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| 209 | ? (mbc1).wc == (mbc2).wc \
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| 210 | : (mbc1).bytes == (mbc2).bytes \
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| 211 | && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
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| 212 | #define mb_caseequal(mbc1, mbc2) \
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| 213 | ((mbc1).wc_valid && (mbc2).wc_valid \
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| 214 | ? towlower ((mbc1).wc) == towlower ((mbc2).wc) \
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| 215 | : (mbc1).bytes == (mbc2).bytes \
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| 216 | && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
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| 217 |
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| 218 | /* <ctype.h>, <wctype.h> classification. */
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| 219 | #define mb_isascii(mbc) \
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| 220 | ((mbc).wc_valid && (mbc).wc >= 0 && (mbc).wc <= 127)
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| 221 | #define mb_isalnum(mbc) ((mbc).wc_valid && iswalnum ((mbc).wc))
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| 222 | #define mb_isalpha(mbc) ((mbc).wc_valid && iswalpha ((mbc).wc))
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| 223 | #define mb_isblank(mbc) ((mbc).wc_valid && iswblank ((mbc).wc))
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| 224 | #define mb_iscntrl(mbc) ((mbc).wc_valid && iswcntrl ((mbc).wc))
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| 225 | #define mb_isdigit(mbc) ((mbc).wc_valid && iswdigit ((mbc).wc))
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| 226 | #define mb_isgraph(mbc) ((mbc).wc_valid && iswgraph ((mbc).wc))
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| 227 | #define mb_islower(mbc) ((mbc).wc_valid && iswlower ((mbc).wc))
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| 228 | #define mb_isprint(mbc) ((mbc).wc_valid && iswprint ((mbc).wc))
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| 229 | #define mb_ispunct(mbc) ((mbc).wc_valid && iswpunct ((mbc).wc))
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| 230 | #define mb_isspace(mbc) ((mbc).wc_valid && iswspace ((mbc).wc))
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| 231 | #define mb_isupper(mbc) ((mbc).wc_valid && iswupper ((mbc).wc))
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| 232 | #define mb_isxdigit(mbc) ((mbc).wc_valid && iswxdigit ((mbc).wc))
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| 233 |
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| 234 | /* Extra <wchar.h> function. */
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| 235 |
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| 236 | /* Unprintable characters appear as a small box of width 1. */
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| 237 | #define MB_UNPRINTABLE_WIDTH 1
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| 238 |
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| 239 | MBCHAR_INLINE int
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| 240 | mb_width_aux (wint_t wc)
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| 241 | {
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| 242 | int w = wcwidth (wc);
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| 243 | /* For unprintable characters, arbitrarily return 0 for control characters
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| 244 | and MB_UNPRINTABLE_WIDTH otherwise. */
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| 245 | return (w >= 0 ? w : iswcntrl (wc) ? 0 : MB_UNPRINTABLE_WIDTH);
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| 246 | }
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| 247 |
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| 248 | #define mb_width(mbc) \
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| 249 | ((mbc).wc_valid ? mb_width_aux ((mbc).wc) : MB_UNPRINTABLE_WIDTH)
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| 250 |
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| 251 | /* Output. */
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| 252 | #define mb_putc(mbc, stream) fwrite ((mbc).ptr, 1, (mbc).bytes, (stream))
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| 253 |
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| 254 | /* Assignment. */
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| 255 | #define mb_setascii(mbc, sc) \
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| 256 | ((mbc)->ptr = (mbc)->buf, (mbc)->bytes = 1, (mbc)->wc_valid = 1, \
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| 257 | (mbc)->wc = (mbc)->buf[0] = (sc))
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| 258 |
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| 259 | /* Copying a character. */
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| 260 | MBCHAR_INLINE void
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| 261 | mb_copy (mbchar_t *new_mbc, const mbchar_t *old_mbc)
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| 262 | {
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| 263 | if (old_mbc->ptr == &old_mbc->buf[0])
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| 264 | {
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| 265 | memcpy (&new_mbc->buf[0], &old_mbc->buf[0], old_mbc->bytes);
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| 266 | new_mbc->ptr = &new_mbc->buf[0];
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| 267 | }
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| 268 | else
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| 269 | new_mbc->ptr = old_mbc->ptr;
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| 270 | new_mbc->bytes = old_mbc->bytes;
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| 271 | if ((new_mbc->wc_valid = old_mbc->wc_valid))
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| 272 | new_mbc->wc = old_mbc->wc;
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| 273 | }
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| 274 |
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| 275 |
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| 276 | /* is_basic(c) tests whether the single-byte character c is in the
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| 277 | ISO C "basic character set".
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| 278 | This is a convenience function, and is in this file only to share code
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| 279 | between mbiter_multi.h and mbfile_multi.h. */
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| 280 | #if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
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| 281 | && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
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| 282 | && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
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| 283 | && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
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| 284 | && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
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| 285 | && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
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| 286 | && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
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| 287 | && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
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| 288 | && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
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| 289 | && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
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| 290 | && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
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| 291 | && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
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| 292 | && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
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| 293 | && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
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| 294 | && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
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| 295 | && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
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| 296 | && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
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| 297 | && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
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| 298 | && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
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| 299 | && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
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| 300 | && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
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| 301 | && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
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| 302 | && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
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| 303 | /* The character set is ISO-646, not EBCDIC. */
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| 304 | # define IS_BASIC_ASCII 1
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| 305 |
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| 306 | extern const unsigned int is_basic_table[];
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| 307 |
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| 308 | MBCHAR_INLINE bool
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| 309 | is_basic (char c)
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| 310 | {
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| 311 | return (is_basic_table [(unsigned char) c >> 5] >> ((unsigned char) c & 31))
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| 312 | & 1;
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| 313 | }
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| 314 |
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| 315 | #else
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| 316 |
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| 317 | MBCHAR_INLINE bool
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| 318 | is_basic (char c)
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| 319 | {
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| 320 | switch (c)
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| 321 | {
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| 322 | case '\t': case '\v': case '\f':
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| 323 | case ' ': case '!': case '"': case '#': case '%':
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| 324 | case '&': case '\'': case '(': case ')': case '*':
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| 325 | case '+': case ',': case '-': case '.': case '/':
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| 326 | case '0': case '1': case '2': case '3': case '4':
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| 327 | case '5': case '6': case '7': case '8': case '9':
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| 328 | case ':': case ';': case '<': case '=': case '>':
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| 329 | case '?':
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| 330 | case 'A': case 'B': case 'C': case 'D': case 'E':
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| 331 | case 'F': case 'G': case 'H': case 'I': case 'J':
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| 332 | case 'K': case 'L': case 'M': case 'N': case 'O':
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| 333 | case 'P': case 'Q': case 'R': case 'S': case 'T':
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| 334 | case 'U': case 'V': case 'W': case 'X': case 'Y':
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| 335 | case 'Z':
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| 336 | case '[': case '\\': case ']': case '^': case '_':
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| 337 | case 'a': case 'b': case 'c': case 'd': case 'e':
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| 338 | case 'f': case 'g': case 'h': case 'i': case 'j':
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| 339 | case 'k': case 'l': case 'm': case 'n': case 'o':
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| 340 | case 'p': case 'q': case 'r': case 's': case 't':
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| 341 | case 'u': case 'v': case 'w': case 'x': case 'y':
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| 342 | case 'z': case '{': case '|': case '}': case '~':
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| 343 | return 1;
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| 344 | default:
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| 345 | return 0;
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| 346 | }
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| 347 | }
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| 348 |
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| 349 | #endif
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| 350 |
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| 351 | _GL_INLINE_HEADER_END
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| 352 |
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| 353 | #endif /* _MBCHAR_H */
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