String encoding problem in R wrappers on Windows

I’m wrapping a library that uses all UTF-8 strings as results.  I noticed recently that non-ASCII characters on Windows contained incorrect characters.  I tracked it down to the use of Rf_mkString in the wrappers which I’m assuming must think the C string is encoded in the native encoding for the platform, not necessarily UTF-8.  The lines looks like:

  r_ans = result ? Rf_mkString(result) : R_NilValue;

I’m not sure how to make the wrappers work properly with UTF-8 result strings though.  The only thing I can think of is to post-process the wrappers to generate code like the following.  It forces the encoding to UTF-8.  This approach seems pretty heavy-handed though and I was wondering if there was a better solution.

  if ( result ) {
    PROTECT(r_ans = Rf_mkCharCE((char *)(result), CE_UTF8)); 
    r_ans = Rf_mkString(r_ans);
    UNPROTECT(1);
  } else {
    r_ans = R_NilValue;
  }

Kevin Smith
[email protected]






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