124 lines
2.3 KiB
C++
124 lines
2.3 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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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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constexpr bool
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IsLowerAlphaNumericASCII(wchar_t ch) noexcept
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{
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return IsLowerAlphaASCII(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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