(flex.info)Reentrant Overview

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19.2 An Overview of the Reentrant API
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The API for reentrant scanners is different than for non-reentrant
scanners.  Here is a quick overview of the API:

     '%option reentrant' must be specified.

   * All functions take one additional argument: 'yyscanner'

   * All global variables are replaced by their macro equivalents.  (We
     tell you this because it may be important to you during debugging.)

   * 'yylex_init' and 'yylex_destroy' must be called before and after
     'yylex', respectively.

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

   * User-specific data can be stored in 'yyextra'.