144 lines
3.4 KiB
C++
144 lines
3.4 KiB
C++
/*
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* Copyright 2011-2020 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef WCHAR_UTIL_HXX
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#define WCHAR_UTIL_HXX
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#include <wchar.h>
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constexpr bool
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IsASCII(const wchar_t ch) noexcept
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{
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return (ch & ~0x7f) == 0;
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}
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constexpr bool
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IsWhitespaceOrNull(const wchar_t ch) noexcept
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{
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return (unsigned)ch <= 0x20;
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}
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constexpr bool
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IsWhitespaceNotNull(const wchar_t ch) noexcept
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{
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return ch > 0 && ch <= 0x20;
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}
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/**
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* Is the given character whitespace? This calls the faster one of
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* IsWhitespaceOrNull() or IsWhitespaceNotNull(). Use this if you
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* want the fastest implementation, and you don't care if a null byte
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* matches.
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*/
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constexpr bool
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IsWhitespaceFast(const wchar_t ch) noexcept
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{
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return IsWhitespaceOrNull(ch);
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}
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/**
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* Is this a non-printable ASCII character? Returns false for
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* non-ASCII characters.
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*
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* Note that this is not the opposide of IsNonPrintableASCII().
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*/
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constexpr bool
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IsPrintableASCII(wchar_t ch) noexcept
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{
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return IsASCII(ch) && ch >= 0x20;
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}
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/**
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* Is this a non-printable character? Returns false for non-ASCII
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* characters.
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*
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* Note that this is not the opposide of IsPrintableASCII()
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*/
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constexpr bool
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IsNonPrintableASCII(wchar_t ch) noexcept
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{
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return (unsigned)ch < 0x20;
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}
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constexpr bool
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IsDigitASCII(wchar_t ch) noexcept
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{
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return ch >= '0' && ch <= '9';
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}
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constexpr bool
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IsUpperAlphaASCII(wchar_t ch) noexcept
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{
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return ch >= 'A' && ch <= 'Z';
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}
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constexpr bool
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IsLowerAlphaASCII(wchar_t ch) noexcept
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{
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return ch >= 'a' && ch <= 'z';
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}
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constexpr bool
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IsAlphaASCII(wchar_t ch) noexcept
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{
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return IsUpperAlphaASCII(ch) || IsLowerAlphaASCII(ch);
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}
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constexpr bool
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IsAlphaNumericASCII(wchar_t ch) noexcept
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{
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return IsAlphaASCII(ch) || IsDigitASCII(ch);
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}
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/**
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* Convert the specified ASCII character (0x00..0x7f) to upper case.
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* Unlike toupper(), it ignores the system locale.
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*/
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constexpr wchar_t
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ToUpperASCII(wchar_t ch) noexcept
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{
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return ch >= 'a' && ch <= 'z'
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? (ch - ('a' - 'A'))
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: ch;
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}
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/**
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* Convert the specified ASCII character (0x00..0x7f) to lower case.
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* Unlike tolower(), it ignores the system locale.
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*/
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constexpr wchar_t
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ToLowerASCII(wchar_t ch) noexcept
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{
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return ch >= 'A' && ch <= 'Z'
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? (ch + ('a' - 'A'))
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: ch;
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}
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#endif
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