[Rd] segmentation fault: formula() with long variable names (PR#3680)

[Peter Dalgaard BSA]

jerome at hivnet.ubc.ca writes:

> R version: 1.7.1
> OS: Red Hat Linux 7.2
> 
> In this example, I would expect an error for the overly long variable 
> name. This is always reproducable for me.
> 
> > formula(paste("y~",paste(rep("x",50000),collapse="")))
> Segmentation fault

Also in (reasonably) current r-devel. But why would you want to do
that?

The cause of the crash is that R_GlobalContext is getting clobbered by
the x's, leading to

Program received signal SIGSEGV, Segmentation fault.
0x0809f491 in Rf_error (format=0x817d7ef "symbol print-name too long")
    at ../../../R/src/main/errors.c:520


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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