Thanks for forwarding this. The idea was for Wget to print the file name it will write to, and yet to refrain from creating the file until the data arrives.
One way to solve this is to use O_EXCL when opening the file, and refusing to write to files that cannot be so opened. Essentially, Wget would assert that the file doesn't exist when it shouldn't be. In pseudo-code: 1. Check if FILE exists. If yes, try with FILE-1, FILE-2, etc., until a non-existent file name is found. Announce the file name to the user, but don't create the file. 2. Send headers, etc. 3. When the data starts arriving, open the file with open(..., O_EXCL|O_CREAT)+fdopen. If open fails, report an error and give up.
