namespace windows {
llvm::error_code UTF8ToUTF16(llvm::StringRef utf8,
llvm::SmallVectorImpl<wchar_t> &utf16) {
- int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
- utf8.begin(), utf8.size(),
- utf16.begin(), 0);
+ if (!utf8.empty()) {
+ int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
+ utf8.size(), utf16.begin(), 0);
- if (len == 0)
- return llvm::windows_error(::GetLastError());
+ if (len == 0)
+ return llvm::windows_error(::GetLastError());
- utf16.reserve(len + 1);
- utf16.set_size(len);
+ utf16.reserve(len + 1);
+ utf16.set_size(len);
- len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
- utf8.begin(), utf8.size(),
- utf16.begin(), utf16.size());
+ len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
+ utf8.size(), utf16.begin(), utf16.size());
- if (len == 0)
- return llvm::windows_error(::GetLastError());
+ if (len == 0)
+ return llvm::windows_error(::GetLastError());
+ }
// Make utf16 null terminated.
utf16.push_back(0);
llvm::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
llvm::SmallVectorImpl<char> &utf8) {
- // Get length.
- int len = ::WideCharToMultiByte(CP_UTF8, 0,
- utf16, utf16_len,
- utf8.begin(), 0,
- NULL, NULL);
-
- if (len == 0)
- return llvm::windows_error(::GetLastError());
-
- utf8.reserve(len);
- utf8.set_size(len);
-
- // Now do the actual conversion.
- len = ::WideCharToMultiByte(CP_UTF8, 0,
- utf16, utf16_len,
- utf8.data(), utf8.size(),
- NULL, NULL);
-
- if (len == 0)
- return llvm::windows_error(::GetLastError());
+ if (utf16_len) {
+ // Get length.
+ int len = ::WideCharToMultiByte(CP_UTF8, 0, utf16, utf16_len, utf8.begin(),
+ 0, NULL, NULL);
+
+ if (len == 0)
+ return llvm::windows_error(::GetLastError());
+
+ utf8.reserve(len);
+ utf8.set_size(len);
+
+ // Now do the actual conversion.
+ len = ::WideCharToMultiByte(CP_UTF8, 0, utf16, utf16_len, utf8.data(),
+ utf8.size(), NULL, NULL);
+
+ if (len == 0)
+ return llvm::windows_error(::GetLastError());
+ }
// Make utf8 null terminated.
utf8.push_back(0);