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Unix Version 7 - man page for ar (v7 section 5)

AR(5)				       File Formats Manual				    AR(5)

NAME
       ar - archive (library) file format

SYNOPSIS
       #include <ar.h>

DESCRIPTION
       The  archive  command  ar  is  used  to combine several files into one.	Archives are used
       mainly as libraries to be searched by the link-editor ld.

       A file produced by ar has a magic number at the start, followed by the constituent  files,
       each  preceded  by  a file header.  The magic number and header layout as described in the
       include file are:

	      /* Header describing `ar' archive file format.
		 Copyright (C) 1996-2018 Free Software Foundation, Inc.
		 This file is part of the GNU C Library.

		 The GNU C Library is free software; you can redistribute it and/or
		 modify it under the terms of the GNU Lesser General Public
		 License as published by the Free Software Foundation; either
		 version 2.1 of the License, or (at your option) any later version.

		 The GNU C Library is distributed in the hope that it will be useful,
		 but WITHOUT ANY WARRANTY; without even the implied warranty of
		 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
		 Lesser General Public License for more details.

		 You should have received a copy of the GNU Lesser General Public
		 License along with the GNU C Library; if not, see
		 <http://www.gnu.org/licenses/>.  */

	      #ifndef _AR_H
	      #define _AR_H 1

	      #include <sys/cdefs.h>

	      /* Archive files start with the ARMAG identifying string.  Then follows a
		 `struct ar_hdr', and as many bytes of member file data as its `ar_size'
		 member indicates, for each member file.  */

	      #define ARMAG "!<arch>0/* String that begins an archive file.  */
	      #define SARMAG8/* Size of that string.  */

	      #define ARFMAG"`0/* String in ar_fmag at end of each header.  */

	      __BEGIN_DECLS

	      struct ar_hdr
		{
		  char ar_name[16];/* Member file name, sometimes / terminated. */
		  char ar_date[12];/* File date, decimal seconds since Epoch.  */
		  char ar_uid[6], ar_gid[6];/* User and group IDs, in ASCII decimal.  */
		  char ar_mode[8];/* File mode, in ASCII octal.  */
		  char ar_size[10];/* File size, in ASCII decimal.  */
		  char ar_fmag[2];/* Always contains ARFMAG.  */
		};

	      __END_DECLS

	      #endif /* ar.h */

       The name is a null-terminated string; the date is in the form of time(2); the user ID  and
       group  ID  are  numbers;  the  mode  is a bit pattern per chmod(2); the size is counted in
       bytes.

       Each file begins on a word boundary; a null byte is inserted between files  if  necessary.
       Nevertheless the size given reflects the actual size of the file exclusive of padding.

       Notice there is no provision for empty areas in an archive file.

SEE ALSO
       ar(1), ld(1), nm(1)

BUGS
       Coding user and group IDs as characters is a botch.

											    AR(5)


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