mirror of
https://github.com/mozilla/gecko-dev.git
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137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsEnvironment.h"
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#include "prenv.h"
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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#include "nsPromiseFlatString.h"
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#include "nsDependentString.h"
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#include "nsNativeCharsetUtils.h"
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#include "mozilla/Printf.h"
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#include "mozilla/StaticMutex.h"
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using namespace mozilla;
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NS_IMPL_ISUPPORTS(nsEnvironment, nsIEnvironment)
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nsresult nsEnvironment::Create(REFNSIID aIID, void** aResult) {
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nsresult rv;
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*aResult = nullptr;
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nsEnvironment* obj = new nsEnvironment();
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rv = obj->QueryInterface(aIID, aResult);
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if (NS_FAILED(rv)) {
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delete obj;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsEnvironment::Exists(const nsAString& aName, bool* aOutValue) {
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nsAutoCString nativeName;
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nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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nsAutoCString nativeVal;
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#if defined(XP_UNIX)
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/* For Unix/Linux platforms we follow the Unix definition:
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* An environment variable exists when |getenv()| returns a non-nullptr
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* value. An environment variable does not exist when |getenv()| returns
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* nullptr.
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*/
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const char* value = PR_GetEnv(nativeName.get());
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*aOutValue = value && *value;
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#else
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/* For non-Unix/Linux platforms we have to fall back to a
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* "portable" definition (which is incorrect for Unix/Linux!!!!)
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* which simply checks whether the string returned by |Get()| is empty
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* or not.
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*/
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nsAutoString value;
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Get(aName, value);
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*aOutValue = !value.IsEmpty();
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#endif /* XP_UNIX */
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEnvironment::Get(const nsAString& aName, nsAString& aOutValue) {
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nsAutoCString nativeName;
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nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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nsAutoCString nativeVal;
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const char* value = PR_GetEnv(nativeName.get());
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if (value && *value) {
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rv = NS_CopyNativeToUnicode(nsDependentCString(value), aOutValue);
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} else {
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aOutValue.Truncate();
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rv = NS_OK;
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}
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return rv;
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}
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/* Environment strings must have static duration; We're gonna leak all of this
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* at shutdown: this is by design, caused how Unix/Linux implement environment
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* vars.
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*/
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typedef nsBaseHashtableET<nsCharPtrHashKey, char*> EnvEntryType;
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typedef nsTHashtable<EnvEntryType> EnvHashType;
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static StaticMutex gEnvHashMutex;
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static EnvHashType* gEnvHash MOZ_GUARDED_BY(gEnvHashMutex) = nullptr;
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static EnvHashType* EnsureEnvHash() MOZ_REQUIRES(gEnvHashMutex) {
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if (!gEnvHash) {
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gEnvHash = new EnvHashType;
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}
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return gEnvHash;
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}
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NS_IMETHODIMP
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nsEnvironment::Set(const nsAString& aName, const nsAString& aValue) {
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nsAutoCString nativeName;
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nsAutoCString nativeVal;
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nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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rv = NS_CopyUnicodeToNative(aValue, nativeVal);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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StaticMutexAutoLock lock(gEnvHashMutex);
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EnvEntryType* entry = EnsureEnvHash()->PutEntry(nativeName.get());
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if (!entry) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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SmprintfPointer newData =
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mozilla::Smprintf("%s=%s", nativeName.get(), nativeVal.get());
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if (!newData) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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PR_SetEnv(newData.get());
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if (entry->GetData()) {
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free(entry->GetData());
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}
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entry->SetData(newData.release());
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return NS_OK;
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}
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