[Rd] Rprintf expected encoding
murdoch.duncan at gmail.com
Fri Jun 30 23:54:31 CEST 2017
On 30/06/2017 4:24 PM, Patrick Perry wrote:
> I'm trying to find information about how to use Rprintf with a UTF-8
> encoded string, and I'm not sure what the right cross-platform usage is.
> I found an earlier thread about this
> but it wasn't very helpful.
> If I want to print a UTF-8 string, I can do one of the following:
> 1) Send native data via Rprintf("%s", translateChar(str));
> 2) Send UTF-8 data via Rprintf("%s", translateCharUTF8(str));
> If Rprintf is sending its output to stdout, then (1) seems like the
> correct option. If Rprintf is sending to a file connection with encoding
> set to UTF-8 (for example, after a call to sink(file(...,
> encoding="UTF-8"))), then (2) is correct. Is there any way to know the
> encoding that Rprintf is expecting?
It always expects the native encoding. If the output connection is
UTF-8 encoded, it will translate from native to UTF-8 as it writes.
Things will hopefully change in R 3.5.0, since the translation from
UTF-8 to native to UTF-8 can lose information (and is inefficient even
if not lossy). I think old code should behave as it did in the past,
but there will be a way to say that the incoming string is in UTF-8.
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