ObjFW  Diff

	int len;

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

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

	@try {
		[self appendCString: t
			 withLength: len];
	} @finally {
		free(t);
	}