Function MacOSStringCompare

src/os/macosx/string_osx.cpp:331–345

* Compares two strings using case insensitive natural sort. * * @param s1 First string to compare. * @param s2 Second string to compare. * @return 1 if s1 < s2, 2 if s1 == s2, 3 if s1 > s2, or 0 if not supported by the OS. */

 * @return 1 if s1 < s2, 2 if s1 == s2, 3 if s1 > s2, or 0 if not supported by the OS.
 */
int MacOSStringCompare(std::string_view s1, std::string_view s2)
{
	static const bool supported = MacOSVersionIsAtLeast(10, 5, 0);
	if (!supported) return 0;

	CFStringCompareFlags flags = kCFCompareCaseInsensitive | kCFCompareNumerically | kCFCompareLocalized | kCFCompareWidthInsensitive | kCFCompareForcedOrdering;

	CFAutoRelease<CFStringRef> cf1(CFStringCreateWithBytes(kCFAllocatorDefault, (const UInt8 *)s1.data(), s1.size(), kCFStringEncodingUTF8, false));
	CFAutoRelease<CFStringRef> cf2(CFStringCreateWithBytes(kCFAllocatorDefault, (const UInt8 *)s2.data(), s2.size(), kCFStringEncodingUTF8, false));

	/* If any CFString could not be created (e.g., due to UTF8 invalid chars), return OS unsupported functionality */
	if (cf1 == nullptr || cf2 == nullptr) return 0;

	return (int)CFStringCompareWithOptionsAndLocale(cf1.get(), cf2.get(), CFRangeMake(0, CFStringGetLength(cf1.get())), flags, _osx_locale.get()) + 2;
}

/**
 * Search if a string is contained in another string using the current locale.