Method handle

extlibs/fmt/include/fmt/format-inl.h:83–86

Handle the result of XSI-compliant version of strerror_r.

    // Handle the result of XSI-compliant version of strerror_r.
    int handle(int result) {
      // glibc versions before 2.13 return result in errno.
      return result == -1 ? errno : result;
    }

    // Handle the result of GNU-specific version of strerror_r.
    FMT_MAYBE_UNUSED