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+/* Header describing `ar' archive file format.
+   Copyright (C) 1996-2017 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>\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 */