directory, or across different physical devices), but the constraints
must be documented.
+On Win32 platforms, @renameDirectory@ fails if the /new/ directory already
+exists.
+
The operation may fail with:
* 'HardwareFault'
foreign import ccall unsafe "HsBase.h readdir"
c_readdir :: Ptr CDir -> IO (Ptr CDirent)
-foreign import ccall unsafe "HsBase.h rename"
+foreign import ccall unsafe "dirUtils.h __hscore_renameFile"
c_rename :: CString -> CString -> IO CInt
foreign import ccall unsafe "HsBase.h rewinddir"
}
#endif
}
+
+/*
+ * Function: __hscore_renameFile()
+ *
+ * Provide Haskell98's semantics for renaming files and directories.
+ * It mirrors that of POSIX.1's behaviour for rename() by overwriting
+ * the target if it exists (the MS CRT implementation of rename() returns
+ * an error
+ *
+ */
+HsInt
+__hscore_renameFile( HsAddr src,
+ HsAddr dest)
+{
+#if defined(_MSC_VER) || defined(_WIN32)
+ static int forNT = -1;
+ DWORD rc;
+
+ /* ToDo: propagate error codes back */
+ if (MoveFileA(src, dest)) {
+ return 0;
+ } else {
+ rc = GetLastError();
+ }
+
+ /* Failed...it could be because the target already existed. */
+ if ( !GetFileAttributes(dest) ) {
+ /* No, it's not there - just fail. */
+ errno = 0;
+ return (-1);
+ }
+
+ if (forNT == -1) {
+ OSVERSIONINFO ovi;
+ ovi.dwOSVersionInfoSize = sizeof(ovi);
+ if ( !GetVersionEx(&ovi) ) {
+ errno = 0;
+ return (-1);
+ }
+ forNT = ((ovi.dwPlatformId & VER_PLATFORM_WIN32_NT) != 0);
+ }
+
+ if (forNT) {
+ /* Easy, go for MoveFileEx() */
+ if ( MoveFileExA(src, dest, MOVEFILE_REPLACE_EXISTING) ) {
+ return 0;
+ } else {
+ errno = 0;
+ return (-1);
+ }
+ }
+
+ /* No MoveFileEx() for Win9x, try deleting the target. */
+ /* Similarly, if the MoveFile*() ops didn't work out under NT */
+ if (DeleteFileA(dest)) {
+ if (MoveFileA(src,dest)) {
+ return 0;
+ } else {
+ errno = 0;
+ return (-1);
+ }
+ } else {
+ errno = 0;
+ return (-1);
+ }
+#else
+ return rename(src,dest);
+#endif
+}
+