Changing the Current Directory

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

#define BUFSIZE MAX_PATH

void _tmain(int argc, TCHAR **argv)
{
   TCHAR Buffer[BUFSIZE];
   DWORD dwRet;

   if(argc != 2)
   {
      _tprintf(TEXT("Usage: %s <dir>\n"), argv[0]);
      return;
   }

   dwRet = GetCurrentDirectory(BUFSIZE, Buffer);

   if( dwRet == 0 )
   {
      printf("GetCurrentDirectory failed (%d)\n", GetLastError());
      return;
   }
   if(dwRet > BUFSIZE)
   {
      printf("Buffer too small; need %d characters\n", dwRet);
      return;
   }

   if( !SetCurrentDirectory(argv[1]))
   {
      printf("SetCurrentDirectory failed (%d)\n", GetLastError());
      return;
   }
   _tprintf(TEXT("Set current directory to %s\n"), argv[1]);

   if( !SetCurrentDirectory(Buffer) )
   {
      printf("SetCurrentDirectory failed (%d)\n", GetLastError());
      return;
   }
   _tprintf(TEXT("Restored previous directory (%s)\n"), Buffer);
}