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-.\" Copyright (c) 1990, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)ar.5.5	8.1 (Berkeley) 6/9/93
-.\"
-.Dd June 9, 1993
-.Dt AR 5
-.Os
-.Sh NAME
-.Nm ar
-.Nd archive (library) file format
-.Sh SYNOPSIS
-.Fd #include <ar.h>
-.Sh DESCRIPTION
-The archive command
-.Nm ar
-combines several files into one.
-Archives are mainly used as libraries of object files intended to be
-loaded using the link-editor
-.Xr ld 1 .
-.Pp
-A file created with
-.Nm ar
-begins with the ``magic'' string "!<arch>\en".
-The rest of the archive is made up of objects, each of which is composed
-of a header for a file, a possible file name, and the file contents.
-The header is portable between machine architectures, and, if the file
-contents are printable, the archive is itself printable.
-.Pp
-The header is made up of six variable length
-.Tn ASCII
-fields, followed by a
-two character trailer.
-The fields are the object name (16 characters), the file last modification
-time (12 characters), the user and group id's (each 6 characters), the file
-mode (8 characters) and the file size (10 characters).
-All numeric fields are in decimal, except for the file mode which is in
-octal.
-.Pp
-The modification time is the file
-.Fa st_mtime
-field, i.e.,
-.Dv CUT
-seconds since
-the epoch.
-The user and group id's are the file
-.Fa st_uid
-and
-.Fa st_gid
-fields.
-The file mode is the file
-.Fa st_mode
-field.
-The file size is the file
-.Fa st_size
-field.
-The two-byte trailer is the string "\`\en".
-.Pp
-Only the name field has any provision for overflow.
-If any file name is more than 16 characters in length or contains an
-embedded space, the string "#1/" followed by the
-.Tn ASCII
-length of the
-name is written in the name field.
-The file size (stored in the archive header) is incremented by the length
-of the name.
-The name is then written immediately following the archive header.
-.Pp
-Any unused characters in any of these fields are written as space
-characters.
-If any fields are their particular maximum number of characters in
-length, there will be no separation between the fields.
-.Pp
-Objects in the archive are always an even number of bytes long; files
-which are an odd number of bytes long are padded with a newline (``\en'')
-character, although the size in the header does not reflect this.
-.Sh SEE ALSO
-.Xr ar 1 ,
-.Xr stat 2
-.Sh HISTORY
-There have been at least four
-.Nm ar
-formats.
-The first was denoted by the leading ``magic'' number 0177555 (stored as
-type int).
-These archives were almost certainly created on a 16-bit machine, and
-contain headers made up of five fields.
-The fields are the object name (8 characters), the file last modification
-time (type long), the user id (type char), the file mode (type char) and
-the file size (type unsigned int).
-Files were padded to an even number of bytes.
-.Pp
-The second was denoted by the leading ``magic'' number 0177545 (stored as
-type int).
-These archives may have been created on either 16 or 32-bit machines, and
-contain headers made up of six fields.
-The fields are the object name (14 characters), the file last modification
-time (type long), the user and group id's (each type char), the file mode
-(type int) and the file size (type long).
-Files were padded to an even number of bytes.
-For more information on converting from this format see
-.Xr arcv 8 .
-.Pp
-The current archive format (without support for long character names and
-names with embedded spaces) was introduced in
-.Bx 4.0 .
-The headers were the same as the current format, with the exception that
-names longer than 16 characters were truncated, and names with embedded
-spaces (and often trailing spaces) were not supported.
-It has been extended for these reasons,
-as described above.
-This format first appeared in 4.4BSD.
-.Sh COMPATIBILITY
-No archive format is currently specified by any standard.
-.At V
-has historically distributed archives in a different format from
-all of the above.