65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
/* Copyright (c) 2024, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is designed to work with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have either included with
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the program or referenced in the documentation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef MY_CHAR_TRAITS_INCLUDED
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#define MY_CHAR_TRAITS_INCLUDED
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#include <cstring>
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template <class CharT>
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struct my_char_traits;
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/*
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This is a standards-compliant, drop-in replacement for
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std::char_traits<unsigned char>
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We need this because clang libc++ is removing support for it in clang 19.
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It is not a complete implementation. Rather we implement just enough to
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compile any usage of char_traits<uchar> we have in our codebase.
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*/
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template <>
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struct my_char_traits<unsigned char> {
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using char_type = unsigned char;
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using int_type = unsigned int;
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static void assign(char_type &c1, const char_type &c2) { c1 = c2; }
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static char_type *assign(char_type *s, std::size_t n, char_type a) {
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return static_cast<char_type *>(memset(s, a, n));
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}
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static int compare(const char_type *s1, const char_type *s2, std::size_t n) {
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return memcmp(s1, s2, n);
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}
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static char_type *move(char_type *s1, const char_type *s2, std::size_t n) {
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if (n == 0) return s1;
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return static_cast<char_type *>(memmove(s1, s2, n));
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}
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static char_type *copy(char_type *s1, const char_type *s2, std::size_t n) {
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if (n == 0) return s1;
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return static_cast<char_type *>(memcpy(s1, s2, n));
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}
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};
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#endif // MY_CHAR_TRAITS_INCLUDED
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