Docs for Split.com - Copies large file into 2 smaller files
R. Trevithick, 12/16/87


This little program is simply a system for taking a large source file 
and breaking it into 2 smaller files.  The original source file is not 
altered in any way, and still exists in addition to the 2 new files 
which are created.  This can be handy if you end up with a file which is 
too large for your editor, or if you want to make something fit on 
floppies without using a backup type of program.


It requires 3 command line parameters:

        Source file name
        Destination file name for 1st new file
        Destination file name for 2nd new file


Note that if the source file has an odd number of bytes, the 2nd 
destination file will contain the one extra byte.

If you want to later put the two smaller files back together again, you 
can use the DOS COPY command:

        copy/b dest1name+dest2name NewFileName

Note that the /b switch is essential to get this to work properly.


I've tested this with files ranging from 0 bytes to well over 5 megs, and
haven't found any bugs.


-------------Changes as of 12/16/87 revision----------------

- Ported over for Turbo C compiler (original was Datalight.)  Code size
  reduced from 10K to 3K.
- Eliminated all 'illegal' code, such as direct video writes.  Should run
  on any MS-DOS machine now.
- Increased internal buffer size to 30k.  Program now prints a period as
  each buffer read operation occurs.
- Added interrupt 24h handler to trap hardware errors.
- Program now aborts with error message if you try to split a file which 
  is less than 2 bytes long.  There isn't much point cluttering up your 
  disk with one or more zero-byte files.
- Now deletes output file if a write error, such as disk full,  occurs.
- Eliminated some superfluous messages.