each_byte

/*
 * call-seq:
 *   strio.each_byte {|byte| block }  -> strio
 *
 * See IO#each_byte.
 */
static VALUE
strio_each_byte(self)
    VALUE self;
{
    struct StringIO *ptr = readable(StringIO(self));
    while (ptr->pos < RSTRING(ptr->string)->len) {
        char c = RSTRING(ptr->string)->ptr[ptr->pos++];
        rb_yield(CHR2FIX(c));
    }
    return Qnil;
}