notepad-plus-plus/lexilla/lexlib/CharacterSet.cxx

// Scintilla source code edit control
/** @file CharacterSet.cxx
 ** Simple case functions for ASCII.
 ** Lexer infrastructure.
 **/
// Copyright 1998-2010 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#include <cstdlib>
#include <cassert>

#include <string_view>

#include "CharacterSet.h"

using namespace Lexilla;

namespace Lexilla {

int CompareCaseInsensitive(const char *a, const char *b) noexcept {
	while (*a && *b) {
		if (*a != *b) {
			const char upperA = MakeUpperCase(*a);
			const char upperB = MakeUpperCase(*b);
			if (upperA != upperB)
				return upperA - upperB;
		}
		a++;
		b++;
	}
	// Either *a or *b is nul
	return *a - *b;
}

bool EqualCaseInsensitive(std::string_view a, std::string_view b) noexcept {
	if (a.length() != b.length()) {
		return false;
	}
	for (size_t i = 0; i < a.length(); i++) {
		if (MakeUpperCase(a[i]) != MakeUpperCase(b[i])) {
			return false;
		}
	}
	return true;
}

int CompareNCaseInsensitive(const char *a, const char *b, size_t len) noexcept {
	while (*a && *b && len) {
		if (*a != *b) {
			const char upperA = MakeUpperCase(*a);
			const char upperB = MakeUpperCase(*b);
			if (upperA != upperB)
				return upperA - upperB;
		}
		a++;
		b++;
		len--;
	}
	if (len == 0)
		return 0;
	// Either *a or *b is nul
	return *a - *b;
}

}