title: String input to flex lexer
body: <p>I want to create a read-eval-print loop using flex/bison parser. Trouble is, the flex generated lexer wants input of type FILE*  and i would like it to be char*. Is there anyway to do this?</p>
  
  <p>One suggestion has been to create a pipe, feed it the string and open the file descriptor and send to the lexer. This is fairly simple but it feels convoluted and not very platform independent. Is there a better way?</p>