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Filename : ar.h
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/* Header describing `ar' archive file format.
   Copyright (C) 1996-2021 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
   <https://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>\n"	/* String that begins an archive file.  */
#define SARMAG	8		/* Size of that string.  */

#define ARFMAG	"`\n"		/* 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 */