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-rw-r--r--xpcom/threads/nsEnvironment.cpp163
1 files changed, 163 insertions, 0 deletions
diff --git a/xpcom/threads/nsEnvironment.cpp b/xpcom/threads/nsEnvironment.cpp
new file mode 100644
index 000000000..0de56675e
--- /dev/null
+++ b/xpcom/threads/nsEnvironment.cpp
@@ -0,0 +1,163 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsEnvironment.h"
+#include "prenv.h"
+#include "prprf.h"
+#include "nsBaseHashtable.h"
+#include "nsHashKeys.h"
+#include "nsPromiseFlatString.h"
+#include "nsDependentString.h"
+#include "nsNativeCharsetUtils.h"
+
+using namespace mozilla;
+
+NS_IMPL_ISUPPORTS(nsEnvironment, nsIEnvironment)
+
+nsresult
+nsEnvironment::Create(nsISupports* aOuter, REFNSIID aIID, void** aResult)
+{
+ nsresult rv;
+ *aResult = nullptr;
+
+ if (aOuter) {
+ return NS_ERROR_NO_AGGREGATION;
+ }
+
+ nsEnvironment* obj = new nsEnvironment();
+
+ rv = obj->QueryInterface(aIID, aResult);
+ if (NS_FAILED(rv)) {
+ delete obj;
+ }
+ return rv;
+}
+
+nsEnvironment::~nsEnvironment()
+{
+}
+
+NS_IMETHODIMP
+nsEnvironment::Exists(const nsAString& aName, bool* aOutValue)
+{
+ nsAutoCString nativeName;
+ nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ nsAutoCString nativeVal;
+#if defined(XP_UNIX)
+ /* For Unix/Linux platforms we follow the Unix definition:
+ * An environment variable exists when |getenv()| returns a non-nullptr
+ * value. An environment variable does not exist when |getenv()| returns
+ * nullptr.
+ */
+ const char* value = PR_GetEnv(nativeName.get());
+ *aOutValue = value && *value;
+#else
+ /* For non-Unix/Linux platforms we have to fall back to a
+ * "portable" definition (which is incorrect for Unix/Linux!!!!)
+ * which simply checks whether the string returned by |Get()| is empty
+ * or not.
+ */
+ nsAutoString value;
+ Get(aName, value);
+ *aOutValue = !value.IsEmpty();
+#endif /* XP_UNIX */
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsEnvironment::Get(const nsAString& aName, nsAString& aOutValue)
+{
+ nsAutoCString nativeName;
+ nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ nsAutoCString nativeVal;
+ const char* value = PR_GetEnv(nativeName.get());
+ if (value && *value) {
+ rv = NS_CopyNativeToUnicode(nsDependentCString(value), aOutValue);
+ } else {
+ aOutValue.Truncate();
+ rv = NS_OK;
+ }
+
+ return rv;
+}
+
+/* Environment strings must have static duration; We're gonna leak all of this
+ * at shutdown: this is by design, caused how Unix/Linux implement environment
+ * vars.
+ */
+
+typedef nsBaseHashtableET<nsCharPtrHashKey, char*> EnvEntryType;
+typedef nsTHashtable<EnvEntryType> EnvHashType;
+
+static EnvHashType* gEnvHash = nullptr;
+
+static bool
+EnsureEnvHash()
+{
+ if (gEnvHash) {
+ return true;
+ }
+
+ gEnvHash = new EnvHashType;
+ if (!gEnvHash) {
+ return false;
+ }
+
+ return true;
+}
+
+NS_IMETHODIMP
+nsEnvironment::Set(const nsAString& aName, const nsAString& aValue)
+{
+ nsAutoCString nativeName;
+ nsAutoCString nativeVal;
+
+ nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = NS_CopyUnicodeToNative(aValue, nativeVal);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ MutexAutoLock lock(mLock);
+
+ if (!EnsureEnvHash()) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ EnvEntryType* entry = gEnvHash->PutEntry(nativeName.get());
+ if (!entry) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ char* newData = PR_smprintf("%s=%s",
+ nativeName.get(),
+ nativeVal.get());
+ if (!newData) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ PR_SetEnv(newData);
+ if (entry->mData) {
+ PR_smprintf_free(entry->mData);
+ }
+ entry->mData = newData;
+ return NS_OK;
+}
+
+