Any Method of reading the token values off the stack

[Tim Zimmerlin]

Folks,

In my error recovery processing, I want to read the token values in 
FIFO order off the stack, in yyerror(), before flushing it as part of 
the default "error" rule processing

Does bison provide direct stack access functions/macros? I would like 
to know how many tokens are on the stack. I would like to read them in 
FIFO rather than LIFO order to save them as originally read.

Thanks,
Tim