(flex.info)Accessor Methods

---

Next: Extra Data Prev: Init and Destroy Functions Up: Reentrant Detail

---

Enter node , (file) or (file)node

19.4.5 Accessing Variables with Reentrant Scanners
--------------------------------------------------

Accessor methods (get/set functions) provide access to common 'flex'
variables.

   Many scanners that you build will be part of a larger project.
Portions of your project will need access to 'flex' values, such as
'yytext'.  In a non-reentrant scanner, these values are global, so there
is no problem accessing them.  However, in a reentrant scanner, there
are no global 'flex' values.  You can not access them directly.
Instead, you must access 'flex' values using accessor methods (get/set
functions).  Each accessor method is named 'yyget_NAME' or 'yyset_NAME',
where 'NAME' is the name of the 'flex' variable you want.  For example:

         /* Set the last character of yytext to NULL. */
         void chop ( yyscan_t scanner )
         {
             int len = yyget_leng( scanner );
             yyget_text( scanner )[len - 1] = '\0';
         }

   The above code may be called from within an action like this:

         %%
         .+\n    { chop( yyscanner );}

   You may find that '%option header-file' is particularly useful for
generating prototypes of all the accessor functions.  Note:
option-header.