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[v6.x] test: check reading zero-length env vars #19484

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[v6.x] test: check reading zero-length env vars #19484

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2 changes: 2 additions & 0 deletions src/node.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -2799,6 +2799,7 @@ static void EnvGetter(Local<Name> property,
#else // _WIN32
String::Value key(property);
WCHAR buffer[32767]; // The maximum size allowed for environment variables.
SetLastError(ERROR_SUCCESS);
DWORD result = GetEnvironmentVariableW(reinterpret_cast<WCHAR*>(*key),
buffer,
arraysize(buffer));
Expand Down Expand Up @@ -2846,6 +2847,7 @@ static void EnvQuery(Local<Name> property,
#else // _WIN32
String::Value key(property);
WCHAR* key_ptr = reinterpret_cast<WCHAR*>(*key);
SetLastError(ERROR_SUCCESS);
if (GetEnvironmentVariableW(key_ptr, nullptr, 0) > 0 ||
GetLastError() == ERROR_SUCCESS) {
rc = 0;
Expand Down
22 changes: 22 additions & 0 deletions test/parallel/test-process-env-windows-error-reset.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
'use strict';
require('../common');
const assert = require('assert');

// This checks that after accessing a missing env var, a subsequent
// env read will succeed even for empty variables.

{
process.env.FOO = '';
process.env.NONEXISTENT_ENV_VAR;
const foo = process.env.FOO;

assert.strictEqual(foo, '');
}

{
process.env.FOO = '';
process.env.NONEXISTENT_ENV_VAR;
const hasFoo = 'FOO' in process.env;

assert.strictEqual(hasFoo, true);
}