Write a program in C that does the following:

1. It doesn't use a call from any C or C++ library including cout, cin, printf, scanf, etc. Instead, it uses system calls such as open(), close(), read(), write(), and lseek().

2. It takes a file as input. It then reads the file from top to bottom and bottom to top simultaneously.

3. If a character being read in the first part is the same as a character being read in the second part, a 0 is printed out. Else, a 1 is printed out.

4. Then for each pair of differing characters, it prints out the position number of the first character, the differing characters, and a new line.

5. Finally, it prints out the number of character positions that differ.

For example, suppose the input file has the text "abcdefdcbx"

Then the following is printed out:

100011001

1 a x

5 e f

6 f e

10 x a

Total: 4 character positions differ