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+.\" $NetBSD: capfile.5,v 1.5 2020/08/23 20:23:56 tpaul Exp $
+.\"
+.\" Copyright (c) 2012 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Roy Marples.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd March 27, 2012
+.Dt CAPFILE 5
+.Os
+.Sh NAME
+.Nm capfile
+.Nd capability database files
+.Sh DESCRIPTION
+.Nm
+describes the format of capability database files,
+made popular by
+.Nm termcap .
+.Nm termcap
+itself has been superseded by
+.Xr terminfo 5 ,
+which contains equivalent
+.Nm termcap
+capabilities,
+and this page exists solely to document the
+.Nm termcap
+format as it is still used by other programs such as
+.Xr rtadvd.conf 5 .
+.Pp
+Entries in
+.Nm
+consist of a number of `:'-separated fields.
+The first entry for each record gives the names that are known for the
+record, separated by `|' characters.
+By convention, the last name is usually a comment and is not intended as a
+lookup tag.
+The entry must be terminated by the `:' character.
+.Ss A Sample Entry
+The following entry describes the Teletype model 33.
+.Pp
+.Bd -literal
+T3\||\|tty33\||\|33\||\|tty\||\|Teletype model 33:\e
+ :bl=^G:co#72:.cr=9^M:cr=^M:do=^J:hc:os:am@:
+.Ed
+.Pp
+Entries may continue onto multiple lines by giving a \e as the last
+character of a line, and empty fields
+may be included for readability (here between the last field on a line
+and the first field on the next).
+Comments may be included on lines beginning with
+.Dq # .
+.Ss Types of Capabilities
+Capabilities in
+.Nm
+are of three types: Boolean capabilities,
+numeric capabilities,
+and string capabilities.
+.Pp
+Boolean capabilities are just the name, to indicate the ability is present.
+.Pp
+Numeric capabilities are followed by the character `#' then the value.
+In the example above
+.Sy \&co
+gives the value `72'.
+.Pp
+String capabilities are followed by the character `=' and then the string.
+In the example above
+.Sy \&bl
+gives the value `^G'.
+.Pp
+Sometimes individual capabilities must be commented out.
+To do this, put a period (`.') before the capability name.
+For example, see the first
+.Sy \&cr
+in the example above.
+.Pp
+Sometimes individual capabilities must be marked as absent.
+To do this, put a @ after the capability name.
+For example, see the last
+.Sy \&am
+in the example above.
+This is only useful when merging entries.
+See the tc=name discussion below for more details.
+.Ss Encoding
+Numeric capability values may be given in one of three numeric bases.
+If the number starts with either
+.Ql 0x
+or
+.Ql 0X
+it is interpreted as a hexadecimal number (both upper and lower case a-f
+may be used to denote the extended hexadecimal digits).
+Otherwise, if the number starts with a
+.Ql 0
+it is interpreted as an octal number.
+Otherwise the number is interpreted as a decimal number.
+.Pp
+String capability values may contain any character.
+Non-printable
+.Dv ASCII
+codes, new lines, and colons may be conveniently represented by the use
+of escape sequences:
+.Bl -column "\eX,X\eX" "(ASCII octal nnn)"
+.It ^X ('\fIX\fP' & 037) control-\fIX\fP
+.It \eb, \eB (ASCII 010) backspace
+.It \et, \eT (ASCII 011) tab
+.It \en, \eN (ASCII 012) line feed (newline)
+.It \ef, \eF (ASCII 014) form feed
+.It \er, \eR (ASCII 015) carriage return
+.It \ee, \eE (ASCII 027) escape
+.It \ec, \eC (:) colon
+.It \e\e (\e\|) back slash
+.It \e^ (^) caret
+.It \e\fInnn\fP (ASCII octal \fInnn\fP)
+.El
+.Pp
+A
+.Sq \e
+followed by up to three octal digits directly specifies
+the numeric code for a character.
+The use of
+.Tn ASCII
+.Dv NUL Ns s ,
+while easily
+encoded, causes all sorts of problems and must be used with care since
+.Dv NUL Ns s
+are typically used to denote the end of strings; many applications
+use
+.Sq \e200
+to represent a
+.Dv NUL .
+.Pp
+A special capability,
+.Qq tc=name ,
+is used to indicate that the record specified by
+.Fa name
+should be substituted for the
+.Qq tc
+capability.
+.Qq tc
+capabilities may interpolate records which also contain
+.Qq tc
+capabilities and more than one
+.Qq tc
+capability may be used in a record.
+A
+.Qq tc
+expansion scope (i.e. where the argument is searched for) contains the
+file in which the
+.Qq tc
+is declared and all subsequent files in the file array.
+.Sh SEE ALSO
+.Xr cgetcap 3 ,
+.Xr termcap 3 ,
+.Xr terminfo 5
+.Sh HISTORY
+.Nm termcap
+described the capabilities of terminals, used by programs such as
+.Xr vi 1
+and
+.Xr hack 6 .
+These programs still use
+.Nm termcap
+today, but their capability requests are mapped onto
+.Xr terminfo 5
+ones instead.
+As such, the termcap database file is no longer shipped with
+.Nx .
+.Sh AUTHORS
+.An Roy Marples Aq Mt roy@NetBSD.org