(flex.info.gz) Accessor Methods

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 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. 
 option-header.
 

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