[Rd] Suggestion: mkString(NULL) should be NA

[Jeroen Ooms]

On Thu, May 12, 2016 at 1:20 PM, Jeroen Ooms <jeroen.ooms at stat.ucla.edu> wrote:
> I would like to propose that Rf_mkString(NULL) and Rf_mkChar(NULL)
> return NA rather than segfault.

An example implementation: https://git.io/vroxm

With this patch, mkChar(NULL), mkCharCE(NULL, ce) would return
NA_STRING rather than segfault at strlen(NULL). This automatically
fixes mkString(NULL) as well which wraps mkChar (See Rinlinedfuns.h).