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Io: Fallback to long/full path on Windows XP.

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unknownbrackets committed Aug 13, 2018
1 parent ac5467c commit a2530be18d95b2dfc615ab6fc2724c3579bafe47
Showing with 46 additions and 9 deletions.
  1. +46 −9 Common/FileUtil.cpp
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@@ -102,19 +102,56 @@ bool OpenCPPFile(std::fstream & stream, const std::string &filename, std::ios::o
std::string ResolvePath(const std::string &path) {
#ifdef _WIN32
HANDLE hFile = CreateFile(ConvertUTF8ToWString(path).c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (hFile == INVALID_HANDLE_VALUE)
return path;
typedef DWORD (WINAPI *getFinalPathNameByHandleW_f)(HANDLE hFile, LPWSTR lpszFilePath, DWORD cchFilePath, DWORD dwFlags);
static getFinalPathNameByHandleW_f getFinalPathNameByHandleW = nullptr;
if (!getFinalPathNameByHandleW) {
// We leak this, but that's okay since the process should hold onto this DLL for the entire lifetime anyway.
HMODULE kernel32 = LoadLibraryW(L"kernel32.dll");
getFinalPathNameByHandleW = (getFinalPathNameByHandleW_f)GetProcAddress(kernel32, "GetFinalPathNameByHandleW");
}
static const int BUF_SIZE = 32768;
wchar_t *buf = new wchar_t[BUF_SIZE];
memset(buf, 0, BUF_SIZE);
std::wstring input = ConvertUTF8ToWString(path);
if (getFinalPathNameByHandleW) {
HANDLE hFile = CreateFile(input.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (hFile == INVALID_HANDLE_VALUE) {
wcscpy_s(buf, BUF_SIZE - 1, input.c_str());
} else {
int result = GetFinalPathNameByHandle(hFile, buf, BUF_SIZE - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
if (result >= BUF_SIZE || result == 0)
wcscpy_s(buf, BUF_SIZE - 1, input.c_str());
}
} else {
wchar_t *longBuf = new wchar_t[BUF_SIZE];
memset(buf, 0, BUF_SIZE);
wchar_t buf[1024] = {0};
int result = GetFinalPathNameByHandle(hFile, buf, (int)ARRAY_SIZE(buf) - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
if (result >= ARRAY_SIZE(buf))
return path;
int result = GetLongPathNameW(input.c_str(), longBuf, BUF_SIZE - 1);
if (result >= BUF_SIZE || result == 0)
wcscpy_s(longBuf, BUF_SIZE - 1, input.c_str());
result = GetFullPathNameW(longBuf, BUF_SIZE - 1, buf, nullptr);
if (result >= BUF_SIZE || result == 0)
wcscpy_s(buf, BUF_SIZE - 1, input.c_str());
delete [] longBuf;
// Normalize slashes just in case.
for (int i = 0; i < BUF_SIZE; ++i) {
if (buf[i] == '\\')
buf[i] = '/';
}
}
// Undo the \\?\C:\ syntax that's normally returned.
std::string output = ConvertWStringToUTF8(buf);
if (buf[0] == '\\' && buf[1] == '\\' && buf[2] == '?' && buf[3] == '\\' && isalpha(buf[4]) && buf[5] == ':')
return ConvertWStringToUTF8(buf).substr(4);
return ConvertWStringToUTF8(buf);
output = output.substr(4);
delete [] buf;
return output;
#else
char buf[PATH_MAX + 1];
if (realpath(path.c_str(), buf) == nullptr)

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