ObjFW  Diff

		int len;

		if (fmt == nil)
			@throw [OFInvalidArgumentException newWithClass: isa
							       selector: _cmd];

		if ((len = of_vasprintf(&string, [fmt cString], args)) == -1)
			@throw [OFInvalidArgumentException newWithClass: isa
			@throw [OFInvalidFormatException newWithClass: isa];
							       selector: _cmd];

		@try {
			length = len;

			switch (of_string_check_utf8(string, length)) {
			case 1:
				isUTF8 = YES;