Just wanted to share something I just run into and fixed - when an R
package is compiled for 64-bit Windows using "ucrt" C library, functions
like ftell() and fseek() use 32-bit arguments for offsets, rather than
64-bit.
What's worse the type "off_t" is 32-bit as well, which defeats the
purpose of introducing off_t in the first place.
The solution for me was to replace ftell()/fseek() with MS-specific
_lseeki64(), _ftelli64() and _fseeki64(), and redefine off_t to be 64-bit
"long long int".
So typical MS - there is a C-library to compile against but without
changes the code only works up to 2GB.
It might be a good idea to have an R-shim to isolate ucrt() and provide
64-bit functions for R packages.
What do you think?
best
Vladimir Dergachev
______________________________________________
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
