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19.3 Reentrant Example

First, an example of a reentrant scanner:

    /* This scanner prints "//" comments. */

    %option reentrant stack noyywrap
    %x COMMENT

    %%

    "//"                 yy_push_state( COMMENT, yyscanner);
    .|\n

    <COMMENT>\n          yy_pop_state( yyscanner );
    <COMMENT>[^\n]+      fprintf( yyout, "%s\n", yytext);

    %%

    int main ( int argc, char * argv[] )
    {
        yyscan_t scanner;

        yylex_init ( &scanner );
        yylex ( scanner );
        yylex_destroy ( scanner );
    return 0;
   }

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