(flex.info)Global Replacement

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19.4.3 Global Variables Replaced By Macros
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All global variables in traditional flex have been replaced by macro
equivalents.

   Note that in the above example, 'yyout' and 'yytext' are not plain
variables.  These are macros that will expand to their equivalent
lvalue.  All of the familiar 'flex' globals have been replaced by their
macro equivalents.  In particular, 'yytext', 'yyleng', 'yylineno',
'yyin', 'yyout', 'yyextra', 'yylval', and 'yylloc' are macros.  You may
safely use these macros in actions as if they were plain variables.  We
only tell you this so you don't expect to link to these variables
externally.  Currently, each macro expands to a member of an internal
struct, e.g.,

     #define yytext (((struct yyguts_t*)yyscanner)->yytext_r)

   One important thing to remember about 'yytext' and friends is that
'yytext' is not a global variable in a reentrant scanner, you can not
access it directly from outside an action or from other functions.  You
must use an accessor method, e.g., 'yyget_text', to accomplish this.
(See below).