Merge #18126: tests: Add fuzzing harness testing the locale independence of the strencodings.h functions

259e290db8f784dba75979acf16e7964af63445c tests: Add fuzzing harness for locale independence testing (practicalswift)

Pull request description:

  Context: [C and C++ locale assumptions in bitcoind and bitcoin-qt](https://github.com/bitcoin/bitcoin/pull/18124)

  Add fuzzing harness for locale independence testing of functions in `strencodings.h` and `tinyformat.h`.

  Test this PR using:

  ```
  $ make distclean
  $ ./autogen.sh
  $ CC=clang CXX=clang++ ./configure --enable-fuzz \
        --with-sanitizers=address,fuzzer,undefined
  $ make
  $ src/test/fuzz/locale
  …
  ```

  The tested functions (`ParseInt32(…)`, `ParseInt64(…)`, `atoi(const std::string&)`, `atoi64(const std::string& str)`, `i64tostr(const char*)`, `itostr(…)`, `strprintf(…)`) all call locale dependent functions (such as `strtol(…)`, `strtoll(…)`, `atoi(const char*)`, etc.) but are assumed to do so in a way that the tested functions return same results regardless of the chosen C locale (`setlocale`).

  This fuzzer aims to test that those assumptions hold up also in practice now and over time.

Top commit has no ACKs.

Tree-SHA512: d108d2f85aa6f482839dafbc7579465ffd4bacf7bc52835ad0fbaa1c71aed9b3870c83447b3d453a03b9ce307e76a3cfdd350a0c77024ab094c93c7d62c8a527

0 files changed, 0 insertions, 0 deletions