Reading Lines

Now that we remember how to C, let's implement a function to read files line by line, similar to fgets(3). However, you'll be using the much lower-level read(2) system call.

read() takes three arguments:

• fd -- the file descriptor to read from. To get a file descriptor, use open(). For this assignment, O_RDONLY is sufficient for the flags parameter to open().
• buf -- where data being read will be copied.
• count -- number of bytes to read. Since read() doesn't really recognize where lines start or end, you will tell it how many bytes to read at a time instead.

You'll build on this to implement your lineread() function.

Once that is complete, take it one step further by creating a dynamic_lineread() that can auto-allocate and resize a buffer (much like getline(3)). This will require dynamically re-allocating memory as needed.

You can use make test to test your implementations.