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2022-05-23stdio-common: Add tst-memstream-string for open_memstream overflowFlorian Weimer
This code path is exercised indirectly by some of the DNS stub resolver tests, via their own use of xopen_memstream for constructing strings describing result data. The relative lack of test suite coverage became apparent when these tests starting failing after a printf changes uncovered bug 28949. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>