src: fix console debug output on Windows

The FWrite function on Windows assumed that MultiByteToWideChar
automatically null-terminates the resulting string, but it will only do
so if the size of the source was passed as -1 or null character was
explicitly counted in the size. The FWrite uses std::string and its
`.size()` method which doesn't count the null character even though the
`.data()` method adds it to the resulting string.

https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar#remarks
> MultiByteToWideChar does not null-terminate an output string if the
  input string length is explicitly specified without a terminating null
  character. To null-terminate an output string for this function, the
  application should pass in -1 or explicitly count the terminating null
  character for the input string.

PR-URL: #31580
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: lundibundi

src/debug_utils.cc

@@ -468,9 +468,7 @@ void FWrite(FILE* file, const std::string& str) {
   std::vector<wchar_t> wbuf(n);
   MultiByteToWideChar(CP_UTF8, 0, str.data(), str.size(), wbuf.data(), n);
 
-  // Don't include the final null character in the output
-  CHECK_GT(n, 0);
-  WriteConsoleW(handle, wbuf.data(), n - 1, nullptr, nullptr);
+  WriteConsoleW(handle, wbuf.data(), n, nullptr, nullptr);
   return;
 #elif defined(__ANDROID__)
   if (file == stderr) {

test/parallel/test-http2-debug.js

@@ -12,16 +12,16 @@ const { stdout, stderr } = child_process.spawnSync(process.execPath, [
   path.resolve(__dirname, 'test-http2-ping.js')
 ], { encoding: 'utf8' });
 
-assert(stderr.match(/Setting the NODE_DEBUG environment variable to 'http2' can expose sensitive data \(such as passwords, tokens and authentication headers\) in the resulting log\./),
+assert(stderr.match(/Setting the NODE_DEBUG environment variable to 'http2' can expose sensitive data \(such as passwords, tokens and authentication headers\) in the resulting log\.\r?\n/),
        stderr);
-assert(stderr.match(/Http2Session client \(\d+\) handling data frame for stream \d+/),
+assert(stderr.match(/Http2Session client \(\d+\) handling data frame for stream \d+\r?\n/),
        stderr);
-assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session client \(\d+\)\] reading starting/),
+assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session client \(\d+\)\] reading starting\r?\n/),
        stderr);
-assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session client \(\d+\)\] closed with code 0/),
+assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session client \(\d+\)\] closed with code 0\r?\n/),
        stderr);
-assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session server \(\d+\)\] closed with code 0/),
+assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session server \(\d+\)\] closed with code 0\r?\n/),
        stderr);
-assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session server \(\d+\)\] tearing down stream/),
+assert(stderr.match(/HttpStream \d+ \(\d+\) \[Http2Session server \(\d+\)\] tearing down stream\r?\n/),
        stderr);
 assert.strictEqual(stdout.trim(), '');