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Copy pathEnvironmentBlockHelpers.h
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97 lines (77 loc) · 1.61 KB
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#pragma once
#include <map>
#include <vector>
#include <sstream>
struct EnvVarComparator : std::binary_function<std::wstring, std::wstring, bool>
{
bool operator()(const std::wstring& left, const std::wstring& right) const
{
return _wcsicmp(left.c_str(), right.c_str()) < 0;
}
};
using EnvironmentMap = std::map<std::wstring, std::wstring, EnvVarComparator>;
static void ParseEnvironmentBlock(const wchar_t* block, EnvironmentMap& out)
{
const wchar_t* p = block;
std::wstringstream curString;
std::wstring curKey;
std::wstring curValue;
bool inKey = true;
bool firstKeyChar = true;
while (true)
{
wchar_t curChar = *p;
if (inKey)
{
if (curChar == L'\0')
{
break;
}
else if (curChar == L'=' && !firstKeyChar)
{
curKey = curString.str();
curString.str(L"");
curString.clear();
inKey = false;
}
else
{
curString << curChar;
}
firstKeyChar = false;
}
else
{
if (curChar == L'\0')
{
curValue = curString.str();
curString.str(L"");
curString.clear();
out[curKey] = curValue;
inKey = true;
firstKeyChar = true;
}
else
{
curString << curChar;
}
}
p++;
}
}
static void BuildEnvironmentBlock(const EnvironmentMap& map, std::vector<wchar_t>& outBlock)
{
outBlock.clear();
for (auto& pair : map)
{
// write the key
outBlock.insert(outBlock.end(), pair.first.cbegin(), pair.first.cend());
// equals symbol
outBlock.push_back(L'=');
// value
outBlock.insert(outBlock.end(), pair.second.cbegin(), pair.second.cend());
// null terminator
outBlock.push_back(L'\0');
}
outBlock.push_back(L'\0');
}