[UFFI] Call a function where argument type is char ** (argv)

Hello,

I have written a R bridge in Pharo and I would like to migrate it from NativeBoost to UFFI.

Most of the changes are easy to do but I am stuck to a double pointer problem.

I have to call the function: int Rf_initEmbeddedR(int argc, char ** argv). I know how to give the int but the char ** is a problem.

With NB, I managed to have this (working) code:

                "This is 32bit... too bad..."

                strings := OrderedCollection new.

                par := NativeBoost allocate: 4 * params size.

                params

                                keysAndValuesDo: [ :i :each |

                                                | str |

                                                str := each asNBExternalString.

                                                strings add: str.

                                                par nbUInt32AtOffset: (i - 1) * 4 put: str value ].

                self prim_initEmbeddedRargc: params size argv: par ]

                                ensure: [

                                                "Free the memory we allocated"

                                                par ifNotNil: [ par free ].

                                                strings ifNotNil: [ strings do: [ :each | each free ] ] ]

With a primitive call:

Self nbCall: #(int Rf_initEmbeddedR(int argc, char *argv))

Do I still need to create my own array of strings or FFI creates it for me? How?

Thanks in advance for your answers,

Vincent

TL;DR: How to pass as argument an array of Strings (char **) with Unified-FFI?

Vincent