1/*
2 * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "EnvironmentVariables.h"
28
29#include <crt_externs.h>
30
31namespace WebKit {
32
33EnvironmentVariables::EnvironmentVariables()
34    : m_environmentPointer(*_NSGetEnviron())
35{
36}
37
38EnvironmentVariables::~EnvironmentVariables()
39{
40    size_t size = m_allocatedStrings.size();
41    for (size_t i = 0; i < size; ++i)
42        fastFree(m_allocatedStrings[i]);
43}
44
45void EnvironmentVariables::set(const char* name, const char* value)
46{
47    // Check if we need to copy the environment.
48    if (m_environmentPointer == *_NSGetEnviron())
49        copyEnvironmentVariables();
50
51    // Allocate a string for the name and value.
52    const char* nameAndValue = createStringForVariable(name, value);
53
54    for (size_t i = 0; i < m_environmentVariables.size() - 1; ++i) {
55        if (valueIfVariableHasName(m_environmentVariables[i], name)) {
56            // Just replace the environment variable.
57            m_environmentVariables[i] = const_cast<char*>(nameAndValue);
58            return;
59        }
60    }
61
62    // Append the new string.
63    ASSERT(!m_environmentVariables.last());
64    m_environmentVariables.last() = const_cast<char*>(nameAndValue);
65    m_environmentVariables.append(static_cast<char*>(0));
66
67    m_environmentPointer = m_environmentVariables.data();
68}
69
70const char* EnvironmentVariables::get(const char* name) const
71{
72    for (size_t i = 0; m_environmentPointer[i]; ++i) {
73        if (const char* value = valueIfVariableHasName(m_environmentPointer[i], name))
74            return value;
75    }
76    return 0;
77}
78
79void EnvironmentVariables::appendValue(const char* name, const char* value, char separator)
80{
81    const char* existingValue = get(name);
82    if (!existingValue) {
83        set(name, value);
84        return;
85    }
86
87    Vector<char, 128> newValue;
88    newValue.append(existingValue, strlen(existingValue));
89    newValue.append(separator);
90    newValue.append(value, strlen(value) + 1);
91
92    set(name, newValue.data());
93}
94
95const char* EnvironmentVariables::valueIfVariableHasName(const char* environmentVariable, const char* name) const
96{
97    // Find the environment variable name.
98    const char* equalsLocation = strchr(environmentVariable, '=');
99    ASSERT(equalsLocation);
100
101    size_t nameLength = equalsLocation - environmentVariable;
102    if (strlen(name) != nameLength)
103        return 0;
104    if (memcmp(environmentVariable, name, nameLength))
105        return 0;
106
107    return equalsLocation + 1;
108}
109
110const char* EnvironmentVariables::createStringForVariable(const char* name, const char* value)
111{
112    int nameLength = strlen(name);
113    int valueLength = strlen(value);
114
115    // Allocate enough room to hold 'name=value' and the null character.
116    char* string = static_cast<char*>(fastMalloc(nameLength + 1 + valueLength + 1));
117    memcpy(string, name, nameLength);
118    string[nameLength] = '=';
119    memcpy(string + nameLength + 1, value, valueLength);
120    string[nameLength + 1 + valueLength] = '\0';
121
122    m_allocatedStrings.append(string);
123
124    return string;
125}
126
127void EnvironmentVariables::copyEnvironmentVariables()
128{
129    for (size_t i = 0; (*_NSGetEnviron())[i]; i++)
130        m_environmentVariables.append((*_NSGetEnviron())[i]);
131
132    // Null-terminate the array.
133    m_environmentVariables.append(static_cast<char*>(0));
134
135    // Update the environment pointer.
136    m_environmentPointer = m_environmentVariables.data();
137}
138
139const char* EnvironmentVariables::preexistingProcessServiceNameKey()
140{
141    return "WEBKIT_PREEXISTING_PROCESS_SERVICE_NAME";
142}
143
144const char* EnvironmentVariables::preexistingProcessTypeKey()
145{
146    return "WEBKIT_PREEXISTING_PROCESS_TYPE";
147}
148
149void EnvironmentVariables::dump()
150{
151    for (size_t i = 0; (*_NSGetEnviron())[i]; i++)
152        printf("%s\n", (*_NSGetEnviron())[i]);
153
154    printf("\n\n\n");
155}
156
157} // namespace WebKit
158