Use some variables and function of Bison and Flex

I've some doubts about how can i use some functions and variables
avaliable in Bison and Flex. The functions is: yyback, yyestate,
yyinput, yylook, yymatch, yyoutput, yysvec. If anybody knows where can
i find any reference about this functions and variables, please tell
me.


Thanks!
[yyinput and yyoutput are the lex input and output streams,
documented in the man page. The rest are internal yacc
stuff that you use at your own risk since there's no promise
that they'll do the same thing or even exist from one version
of yacc or bison to another. -John]

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