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Split a rename_handle out of rename on windows.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2017-11-21 01:52:44 +00:00
parent 3b2fe5ed18
commit 1b39ccedef
1 changed files with 13 additions and 3 deletions
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16
lib/Support/Windows/Path.inc
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@ -418,14 +418,13 @@ static std::error_code rename_internal(HANDLE FromHandle, const Twine &To,
return std::error_code();
}
static std::error_code rename_handle(HANDLE Handle, const Twine &To);
std::error_code rename(const Twine &From, const Twine &To) {
// Convert to utf-16.
SmallVector<wchar_t, 128> WideFrom;
SmallVector<wchar_t, 128> WideTo;
if (std::error_code EC = widenPath(From, WideFrom))
return EC;
if (std::error_code EC = widenPath(To, WideTo))
return EC;
ScopedFileHandle FromHandle;
// Retry this a few times to defeat badly behaved file system scanners.
@ -442,6 +441,14 @@ std::error_code rename(const Twine &From, const Twine &To) {
if (!FromHandle)
return mapWindowsError(GetLastError());
return rename_handle(FromHandle, To);
}
static std::error_code rename_handle(HANDLE FromHandle, const Twine &To) {
SmallVector<wchar_t, 128> WideTo;
if (std::error_code EC = widenPath(To, WideTo))
return EC;
// We normally expect this loop to succeed after a few iterations. If it
// requires more than 200 tries, it's more likely that the failures are due to
// a true error, so stop trying.
@ -452,6 +459,9 @@ std::error_code rename(const Twine &From, const Twine &To) {
std::error_code(ERROR_CALL_NOT_IMPLEMENTED, std::system_category())) {
// Wine doesn't support SetFileInformationByHandle in rename_internal.
// Fall back to MoveFileEx.
SmallVector<wchar_t, MAX_PATH> WideFrom;
if (std::error_code EC2 = realPathFromHandle(FromHandle, WideFrom))
return EC2;
if (::MoveFileExW(WideFrom.begin(), WideTo.begin(),
MOVEFILE_REPLACE_EXISTING))
return std::error_code();