(flex.info)Reentrant Functions

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19.5 Functions and Macros Available in Reentrant C Scanners
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The following Functions are available in a reentrant scanner:

         char *yyget_text ( yyscan_t scanner );
         int yyget_leng ( yyscan_t scanner );
         FILE *yyget_in ( yyscan_t scanner );
         FILE *yyget_out ( yyscan_t scanner );
         int yyget_lineno ( yyscan_t scanner );
         YY_EXTRA_TYPE yyget_extra ( yyscan_t scanner );
         int  yyget_debug ( yyscan_t scanner );

         void yyset_debug ( int flag, yyscan_t scanner );
         void yyset_in  ( FILE * in_str , yyscan_t scanner );
         void yyset_out  ( FILE * out_str , yyscan_t scanner );
         void yyset_lineno ( int line_number , yyscan_t scanner );
         void yyset_extra ( YY_EXTRA_TYPE user_defined , yyscan_t scanner );

   There are no "set" functions for yytext and yyleng. This is
intentional.

   The following Macro shortcuts are available in actions in a reentrant
scanner:

         yytext
         yyleng
         yyin
         yyout
         yylineno
         yyextra
         yy_flex_debug

   In a reentrant C scanner, support for yylineno is always present
(i.e., you may access yylineno), but the value is never modified by
`flex' unless `%option yylineno' is enabled. This is to allow the user
to maintain the line count independently of `flex'.

   The following functions and macros are made available when `%option
bison-bridge' (`--bison-bridge') is specified:

         YYSTYPE * yyget_lval ( yyscan_t scanner );
         void yyset_lval ( YYSTYPE * yylvalp , yyscan_t scanner );
         yylval

   The following functions and macros are made available when `%option
bison-locations' (`--bison-locations') is specified:

         YYLTYPE *yyget_lloc ( yyscan_t scanner );
         void yyset_lloc ( YYLTYPE * yyllocp , yyscan_t scanner );
         yylloc

   Support for yylval assumes that `YYSTYPE' is a valid type.  Support
for yylloc assumes that `YYSLYPE' is a valid type.  Typically, these
types are generated by `bison', and are included in section 1 of the
`flex' input.