[issue5108] Invalid UTF-8 ("%s") length in PyUnicode_FromFormatV()

[Walter Dörwald <report@bugs.python.org> at psf.upfronthosting.co.za]

Walter Dörwald <walter at livinglogic.de> added the comment:

The problem with your patch is that it calls PyUnicode_DecodeUTF8()
twice. It would be better if step 1 in the code would include the %s
format specifiers and step 3 would then call PyUnicode_DecodeUTF8() and
put the result into the callresults buffer.

BTW, I can't make your examples segfault.

Attached is a new version of the patch that implements this. Could you
test this new version to see if there's still a Valgrind report?

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nosy: +doerwalter
Added file: http://bugs.python.org/file13668/diff.txt

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