DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (a81015259a98)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla embedding code.
 *
 * The Initial Developers of the Original Code are
 * Benjamin Smedberg <bsmedberg@covad.net> and 
 * Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>.
 *
 * Portions created by the Initial Developer are Copyright (C) 2003/2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#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_THREADSAFE_ISUPPORTS1(nsEnvironment, nsIEnvironment)

nsresult
nsEnvironment::Create(nsISupports *aOuter, REFNSIID aIID,
                      void **aResult)
{
    nsresult rv;
    *aResult = nsnull;

    if (aOuter != nsnull) {
        return NS_ERROR_NO_AGGREGATION;
    }

    nsEnvironment* obj = new nsEnvironment();
    if (!obj) {
        return NS_ERROR_OUT_OF_MEMORY;
    }

    rv = obj->QueryInterface(aIID, aResult);
    if (NS_FAILED(rv)) {
      delete obj;
    }
    return rv;
}

nsEnvironment::~nsEnvironment()
{
}

NS_IMETHODIMP
nsEnvironment::Exists(const nsAString& aName, bool *aOutValue)
{
    nsCAutoString nativeName;
    nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCAutoString nativeVal;
#if defined(XP_UNIX)
    /* For Unix/Linux platforms we follow the Unix definition:
     * An environment variable exists when |getenv()| returns a non-NULL value.
     * An environment variable does not exist when |getenv()| returns NULL.
     */
    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)
{
    nsCAutoString nativeName;
    nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCAutoString 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 = nsnull;

static bool
EnsureEnvHash()
{
    if (gEnvHash)
        return true;

    gEnvHash = new EnvHashType;
    if (!gEnvHash)
        return false;

    if(gEnvHash->Init())
        return true;

    delete gEnvHash;
    gEnvHash = nsnull;
    return false;
}

NS_IMETHODIMP
nsEnvironment::Set(const nsAString& aName, const nsAString& aValue)
{
    nsCAutoString nativeName;
    nsCAutoString nativeVal;

    nsresult rv = NS_CopyUnicodeToNative(aName, nativeName);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = NS_CopyUnicodeToNative(aValue, nativeVal);
    NS_ENSURE_SUCCESS(rv, 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;
}