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They lead me to more information but the answered the question.
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They lead me to more information but the answered the question.

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I am creating a program capable of reading and writing TAR files with standard header in GNU format.<br />
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I have found that all the variables I need at <a href="http://www.gnu.org/software/automake/manual/tar/Standard.html" rel="ugc">http://www.gnu.org/software/automake/manual/tar/Standard.html</a>. <br />
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Is there any header to be included that has the tar structure already defined?
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I am creating a program capable of reading and writing TAR files with standard header in GNU format.

I have found that all the variables I need at http://www.gnu.org/software/automake/manual/tar/Standard.html. 

Is there any header to be included that has the tar structure already defined?

Which libraries I need in ANSI C to read and write GNU Header for Tar files?

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.