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R package developers who use the native API written in C will surely be interested in the Roxygen-generated Documentation of R source code. The documentation is based on the SVN R-devel branch and will be updated on a monthly basis by the Rexamine team. We have included whole, browsable C code (which is of course licensed under the GNU GPL v2). This is the image of all source files (*.c, *.h) from the R-devel/src/ dir. Enjoy!

Please note that some of the functions available in R have the do_ prefix in C. For example, the internal paste() is implemented as do_paste().