139 lines
2.5 KiB
C++
139 lines
2.5 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#ifndef CHAR_UTIL_HXX
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#define CHAR_UTIL_HXX
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#ifdef _UNICODE
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#include "WCharUtil.hxx"
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#endif
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constexpr bool
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IsASCII(const unsigned char ch) noexcept
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{
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return ch < 0x80;
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}
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constexpr bool
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IsASCII(const char ch) noexcept
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{
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return IsASCII((unsigned char)ch);
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}
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constexpr bool
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IsWhitespaceOrNull(const char ch) noexcept
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{
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return (unsigned char)ch <= 0x20;
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}
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constexpr bool
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IsWhitespaceNotNull(const char 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 char 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 opposite of IsNonPrintableASCII().
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*/
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constexpr bool
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IsPrintableASCII(char ch) noexcept
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{
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return (signed char)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 characters.
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*
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* Note that this is not the opposite of IsPrintableASCII()
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*/
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constexpr bool
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IsNonPrintableASCII(char ch) noexcept
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{
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return (unsigned char)ch < 0x20;
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}
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constexpr bool
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IsDigitASCII(char 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(char 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(char 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(char 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(char 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(char 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 char
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ToUpperASCII(char 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 char
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ToLowerASCII(char 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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constexpr bool
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IsHexDigit(char ch) noexcept
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{
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return IsDigitASCII(ch) ||
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(ch >= 'a' && ch <= 'f') ||
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(ch >= 'A' && ch <= 'F');
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}
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#endif
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