ObjFW  Diff

	if (self == [OFMutableString class])
		return (id)&placeholder;

	return [super alloc];
}

#ifdef OF_HAVE_UNICODE_TABLES
- (void)of_convertWithWordStartTable: (const of_unichar_t *const[])startTable
		     wordMiddleTable: (const of_unichar_t *const[])middleTable
		  wordStartTableSize: (size_t)startTableSize
		 wordMiddleTableSize: (size_t)middleTableSize
{
	void *pool = objc_autoreleasePoolPush();
	const of_unichar_t *characters = [self characters];
	size_t length = [self length];
	bool isStart = true;

	for (size_t i = 0; i < length; i++) {
		const of_unichar_t *const *table;
		size_t tableSize;
		of_unichar_t c = characters[i];

	objc_autoreleasePoolPop(pool);
}
#else
- (void)of_convertWithWordStartFunction: (char (*)(char))startFunction
		     wordMiddleFunction: (char (*)(char))middleFunction
{
	void *pool = objc_autoreleasePoolPush();
	const of_unichar_t *characters = [self characters];
	size_t length = [self length];
	bool isStart = true;

	for (size_t i = 0; i < length; i++) {
		char (*function)(char) =
		    (isStart ? startFunction : middleFunction);
		of_unichar_t c = characters[i];

	objc_autoreleasePoolPop(pool);
}

- (void)appendString: (OFString *)string
{
	[self insertString: string
		   atIndex: [self length]];
}

- (void)appendCharacters: (const of_unichar_t *)characters
		  length: (size_t)length
{
	void *pool = objc_autoreleasePoolPush();

{
	char *UTF8String;
	int UTF8StringLength;

	if (format == nil)
		@throw [OFInvalidArgumentException exception];

	if ((UTF8StringLength = of_vasprintf(&UTF8String, [format UTF8String],
	    arguments)) == -1)
		@throw [OFInvalidFormatException exception];

	@try {
		[self appendUTF8String: UTF8String
				length: UTF8StringLength];
	} @finally {
		free(UTF8String);
	}
}

- (void)prependString: (OFString *)string
{
	[self insertString: string
		   atIndex: 0];
}

- (void)reverse
{
	size_t i, j, length = [self length];

	for (i = 0, j = length - 1; i < length / 2; i++, j--) {
		of_unichar_t tmp = [self characterAtIndex: j];
		[self setCharacter: [self characterAtIndex: i]
			   atIndex: j];
		[self setCharacter: tmp
			   atIndex: i];

- (void)replaceOccurrencesOfString: (OFString *)string
			withString: (OFString *)replacement
{
	[self replaceOccurrencesOfString: string
			      withString: replacement
				 options: 0
				   range: of_range(0, [self length])];
}

- (void)replaceOccurrencesOfString: (OFString *)string
			withString: (OFString *)replacement
			   options: (int)options
			     range: (of_range_t)range
{
	void *pool = objc_autoreleasePoolPush(), *pool2;
	const of_unichar_t *characters;
	const of_unichar_t *searchCharacters = [string characters];
	size_t searchLength = [string length];
	size_t replacementLength = [replacement length];

	if (string == nil || replacement == nil)
		@throw [OFInvalidArgumentException exception];

	if (range.length > SIZE_MAX - range.location ||
	    range.location + range.length > [self length])
		@throw [OFOutOfRangeException exception];

	if (searchLength > range.length) {
		objc_autoreleasePoolPop(pool);
		return;
	}

	pool2 = objc_autoreleasePoolPush();
	characters = [self characters];

	for (size_t i = range.location; i <= range.length - searchLength; i++) {
		if (memcmp(characters + i, searchCharacters,
		    searchLength * sizeof(of_unichar_t)) != 0)
			continue;

		[self replaceCharactersInRange: of_range(i, searchLength)
				    withString: replacement];

		range.length -= searchLength;
		range.length += replacementLength;

		i += replacementLength - 1;

		objc_autoreleasePoolPop(pool2);
		pool2 = objc_autoreleasePoolPush();

		characters = [self characters];
	}

	objc_autoreleasePoolPop(pool);
}

- (void)deleteLeadingWhitespaces
{
	void *pool = objc_autoreleasePoolPush();
	const of_unichar_t *characters = [self characters];
	size_t i, length = [self length];

	for (i = 0; i < length; i++) {
		of_unichar_t c = characters[i];

		if (!of_ascii_isspace(c))
			break;
	}

	objc_autoreleasePoolPop(pool);

	[self deleteCharactersInRange: of_range(0, i)];
}

- (void)deleteTrailingWhitespaces
{
	void *pool;
	const of_unichar_t *characters, *p;
	size_t length, d;

	length = [self length];

	if (length == 0)
		return;

	pool = objc_autoreleasePoolPush();
	characters = [self characters];

	d = 0;
	for (p = characters + length - 1; p >= characters; p--) {
		if (!of_ascii_isspace(*p))
			break;

		d++;