close #647: fixed single-character handling in Rstreambuf

[Enchufa2]

I realised that this wasn't a problem with std::endl, but in general with the output of any single character, which is managed by overflow(). The new implementation of overflow() calls xsputn(), and it works correctly in SPARC too.

[eddelbuettel]

Nice detective work, congrats, and what looks like a clean patch (with arguably "criminal" placement of curly braces :) )

[Enchufa2]

:D Do you prefer the opening brace in the previous line?

[codecov-io]

Codecov Report

Merging #649 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #649   +/-   ##
=======================================
  Coverage   92.59%   92.59%           
=======================================
  Files          65       65           
  Lines        3309     3309           
=======================================
  Hits         3064     3064           
  Misses        245      245

Impacted Files	Coverage Δ
inst/include/Rcpp/iostream/Rstreambuf.h	100% <ø> (ø)	✅

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[eddelbuettel]

Yes, I tend to still write opening curlies on the same line as if or for or function or ...

[Enchufa2]

Solved!

[eddelbuettel]

That wasn't strictly needed but I appreciate it.

[eddelbuettel]

Thanks very much for the bug report, and the fix! This was well done.

We really appreciate the help -- especially on a system we don't generally have access to.

[Enchufa2]

This wouldn't have been possible without the help of Prof. F. Gringoli, from University of Brescia, who revived this decrepit SPARC server for the cause. 😄