From: eric.fowler@gmail.com   
      
   I wrote recently with a question about mapping from a found token back   
   to that token's point in the input stream. I solved it on my own in   
   the meantime.   
      
   The solution was basically as follows:   
      
   - Maintain a pointer to the head of the string to be parsed (I am   
   using an API that inputs string data, not a file), "s_input"   
   - Maintain a running total of bytes, "n_offset", fed to the lexer as a   
   static variable updated within the input() function   
   - Use the variables in YY_CURRENT_BUFFER and do a little pointer   
   arithmetic to extract the desired information, as follows:   
      
   inline const char * buf_offset()   
   {   
   return s_input + (in_offset - (YY_CURRENT_BUFFER)->yy_n_chars) +   
   (yytext - (YY_CURRENT_BUFFER)->yy_ch_buf);   
   }   
      
   Thanks   
      
   Eric   
      
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