Passing custom parameter to yylex() via yyparse() using YYPARSE_PARAM and YYLEX_PARAM macros

[Jeannot_Langlois]

Hi there,


I am actually working at integrating a custom (i.e. NOT flex-based) 
lexical scanner written in C with a Bison 1.875c-generated C pure 
(reentrant) parser.

As the custom lexical scanner will be reading from a socket rather than 
the standard input (i.e., keyboard or pipe redirection), I need to pass 
the socket number (int) to yyparse() so it can be then passed to yylex() 
afterwards.

I found out that earlier versions of Bison permitted the use of the 
YYPARSE_PARAM and YYLEX_PARAM macros which allowed the yyparse() caller 
to pass a structure to yyparse() and then to yylex().  Unfortunately, 
these macros now seem disabled in Bison 1.875c.

How can I pass such a parameter to yyparse() and then to yylex() in a 
similar way in Bison 1.875c now ?

Regards,


--
Jeannot Langlois
B. Sc.  Computer Science / B. Sc.  Informatique
jeannot12 AT linuxmail DOT org


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