The Tor Browser / file comparison
comparison: xpcom/threads/nsEnvironment.cpp
xpcom/threads/nsEnvironment.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:00d608cdb3cf |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsEnvironment.h" | |
| 7 #include "prenv.h" | |
| 8 #include "prprf.h" | |
| 9 #include "nsBaseHashtable.h" | |
| 10 #include "nsHashKeys.h" | |
| 11 #include "nsPromiseFlatString.h" | |
| 12 #include "nsDependentString.h" | |
| 13 #include "nsNativeCharsetUtils.h" | |
| 14 | |
| 15 using namespace mozilla; | |
| 16 | |
| 17 NS_IMPL_ISUPPORTS(nsEnvironment, nsIEnvironment) | |
| 18 | |
| 19 nsresult | |
| 20 nsEnvironment::Create(nsISupports *aOuter, REFNSIID aIID, | |
| 21 void **aResult) | |
| 22 { | |
| 23 nsresult rv; | |
| 24 *aResult = nullptr; | |
| 25 | |
| 26 if (aOuter != nullptr) { | |
| 27 return NS_ERROR_NO_AGGREGATION; | |
| 28 } | |
| 29 | |
| 30 nsEnvironment* obj = new nsEnvironment(); | |
| 31 if (!obj) { | |
| 32 return NS_ERROR_OUT_OF_MEMORY; | |
| 33 } | |
| 34 | |
| 35 rv = obj->QueryInterface(aIID, aResult); | |
| 36 if (NS_FAILED(rv)) { | |
| 37 delete obj; | |
| 38 } | |
| 39 return rv; | |
| 40 } | |
| 41 | |
| 42 nsEnvironment::~nsEnvironment() | |
| 43 { | |
| 44 } | |
| 45 | |
| 46 NS_IMETHODIMP | |
| 47 nsEnvironment::Exists(const nsAString& aName, bool *aOutValue) | |
| 48 { | |
| 49 nsAutoCString nativeName; | |
| 50 nsresult rv = NS_CopyUnicodeToNative(aName, nativeName); | |
| 51 if (NS_WARN_IF(NS_FAILED(rv))) | |
| 52 return rv; | |
| 53 | |
| 54 nsAutoCString nativeVal; | |
| 55 #if defined(XP_UNIX) | |
| 56 /* For Unix/Linux platforms we follow the Unix definition: | |
| 57 * An environment variable exists when |getenv()| returns a non-nullptr | |
| 58 * value. An environment variable does not exist when |getenv()| returns | |
| 59 * nullptr. | |
| 60 */ | |
| 61 const char *value = PR_GetEnv(nativeName.get()); | |
| 62 *aOutValue = value && *value; | |
| 63 #else | |
| 64 /* For non-Unix/Linux platforms we have to fall back to a | |
| 65 * "portable" definition (which is incorrect for Unix/Linux!!!!) | |
| 66 * which simply checks whether the string returned by |Get()| is empty | |
| 67 * or not. | |
| 68 */ | |
| 69 nsAutoString value; | |
| 70 Get(aName, value); | |
| 71 *aOutValue = !value.IsEmpty(); | |
| 72 #endif /* XP_UNIX */ | |
| 73 | |
| 74 return NS_OK; | |
| 75 } | |
| 76 | |
| 77 NS_IMETHODIMP | |
| 78 nsEnvironment::Get(const nsAString& aName, nsAString& aOutValue) | |
| 79 { | |
| 80 nsAutoCString nativeName; | |
| 81 nsresult rv = NS_CopyUnicodeToNative(aName, nativeName); | |
| 82 if (NS_WARN_IF(NS_FAILED(rv))) | |
| 83 return rv; | |
| 84 | |
| 85 nsAutoCString nativeVal; | |
| 86 const char *value = PR_GetEnv(nativeName.get()); | |
| 87 if (value && *value) { | |
| 88 rv = NS_CopyNativeToUnicode(nsDependentCString(value), aOutValue); | |
| 89 } else { | |
| 90 aOutValue.Truncate(); | |
| 91 rv = NS_OK; | |
| 92 } | |
| 93 | |
| 94 return rv; | |
| 95 } | |
| 96 | |
| 97 /* Environment strings must have static duration; We're gonna leak all of this | |
| 98 * at shutdown: this is by design, caused how Unix/Linux implement environment | |
| 99 * vars. | |
| 100 */ | |
| 101 | |
| 102 typedef nsBaseHashtableET<nsCharPtrHashKey,char*> EnvEntryType; | |
| 103 typedef nsTHashtable<EnvEntryType> EnvHashType; | |
| 104 | |
| 105 static EnvHashType *gEnvHash = nullptr; | |
| 106 | |
| 107 static bool | |
| 108 EnsureEnvHash() | |
| 109 { | |
| 110 if (gEnvHash) | |
| 111 return true; | |
| 112 | |
| 113 gEnvHash = new EnvHashType; | |
| 114 if (!gEnvHash) | |
| 115 return false; | |
| 116 | |
| 117 return true; | |
| 118 } | |
| 119 | |
| 120 NS_IMETHODIMP | |
| 121 nsEnvironment::Set(const nsAString& aName, const nsAString& aValue) | |
| 122 { | |
| 123 nsAutoCString nativeName; | |
| 124 nsAutoCString nativeVal; | |
| 125 | |
| 126 nsresult rv = NS_CopyUnicodeToNative(aName, nativeName); | |
| 127 if (NS_WARN_IF(NS_FAILED(rv))) | |
| 128 return rv; | |
| 129 | |
| 130 rv = NS_CopyUnicodeToNative(aValue, nativeVal); | |
| 131 if (NS_WARN_IF(NS_FAILED(rv))) | |
| 132 return rv; | |
| 133 | |
| 134 MutexAutoLock lock(mLock); | |
| 135 | |
| 136 if (!EnsureEnvHash()){ | |
| 137 return NS_ERROR_UNEXPECTED; | |
| 138 } | |
| 139 | |
| 140 EnvEntryType* entry = gEnvHash->PutEntry(nativeName.get()); | |
| 141 if (!entry) { | |
| 142 return NS_ERROR_OUT_OF_MEMORY; | |
| 143 } | |
| 144 | |
| 145 char* newData = PR_smprintf("%s=%s", | |
| 146 nativeName.get(), | |
| 147 nativeVal.get()); | |
| 148 if (!newData) { | |
| 149 return NS_ERROR_OUT_OF_MEMORY; | |
| 150 } | |
| 151 | |
| 152 PR_SetEnv(newData); | |
| 153 if (entry->mData) { | |
| 154 PR_smprintf_free(entry->mData); | |
| 155 } | |
| 156 entry->mData = newData; | |
| 157 return NS_OK; | |
| 158 } | |
| 159 | |
| 160 |
