help me with C languaje please, re: files.

[Pablo Mora]

Hi all, 

I am programming in C and I need to read a quantity of lines of a
file.  How can I know when a line arrives at his end? exists some
special character?  exists some file in C in the kernel of FreeBSD
(4.11) where I can find somewhat similar?

example: how read four lines of a file. 

thanks and sorry for my badly English.
-- 
Concepción, Chile.