gsub!

/*
 *  call-seq:
 *     str.gsub!(pattern, replacement)        => str or nil
 *     str.gsub!(pattern) {|match| block }    => str or nil
 *  
 *  Performs the substitutions of <code>String#gsub</code> in place, returning
 *  <i>str</i>, or <code>nil</code> if no substitutions were performed.
 */

static VALUE
rb_str_gsub_bang(argc, argv, str)
    int argc;
    VALUE *argv;
    VALUE str;
{
    return str_gsub(argc, argv, str, 1);
}