* src/roff/troff/troff.man: Revised and split into troff.man and...

* man/groff_differences.man: New file.
* NEWS: Updated.

* tmac/an-old.tmac (TS, TE): New macros for table support.

4 files changed, 342 insertions, 2254 deletions

diff --git a/ChangeLog b/ChangeLog
index d508a635..78b3801b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2001-11-15  Werner LEMBERG  <wl@gnu.org>
+
+	* src/roff/troff/troff.man: Revised and split into troff.man and...
+	* man/groff_differences.man: New file.
+	* NEWS: Updated.
+
+2001-11-13  Werner LEMBERG  <wl@gnu.org>
+
+	* tmac/an-old.tmac (TS, TE): New macros for table support.
+
 2001-11-12  Werner LEMBERG  <wl@gnu.org>
 
 	* src/include/lib.h: Provide a fix for emx to not include
diff --git a/NEWS b/NEWS
index 76ad1273..f9661595 100644
--- a/NEWS
+++ b/NEWS
@@ -35,6 +35,9 @@ o The `-xwidth' specifier in the mdoc macro package has been removed.  Its
 o A new macro `Ex' has been added to the mdoc macro package to document an
   exit status.
 
+o `troff.man' has been split.  Differences to UNIX troff are now documented
+  in the new man page `groff_differences.man'.
+
 groff
 -----
 
diff --git a/src/roff/troff/troff.man b/src/roff/troff/troff.man
index 7f81c228..913fd0fd 100644
--- a/src/roff/troff/troff.man
+++ b/src/roff/troff/troff.man
@@ -1,25 +1,33 @@
 .ig
-Copyright (C) 1989-2000, 2001 Free Software Foundation, Inc.
+troff.man
 
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
+Last update : 13 Nov 2001
 
-Permission is granted to copy and distribute modified versions of this
-manual under the conditions for verbatim copying, provided that the
-entire resulting derived work is distributed under the terms of a
-permission notice identical to this one.
+This file is part of groff, the GNU roff type-setting system.
 
-Permission is granted to copy and distribute translations of this
-manual into another language, under the above conditions for modified
-versions, except that this permission notice may be included in
-translations approved by the Free Software Foundation instead of in
-the original English.
+Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+
+written by James Clark
+
+modified by Werner Lemberg <wl@gnu.org>
+            Bernd Warken <bwarken@mayn.de>
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.1 or
+any later version published by the Free Software Foundation; with the
+Invariant Sections being this .ig-section and AUTHOR, with no
+Front-Cover Texts, and with no Back-Cover Texts.
+
+A copy of the Free Documentation License is included as a file called
+FDL in the main directory of the groff source package.
 ..
 .
-.\" define a string tx for the TeX logo
-.ie t .ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
-.el .ds tx TeX
+.
+.\" --------------------------------------------------------------------
+.\" Setup
+.\" --------------------------------------------------------------------
+.
+.mso www.tmac
 .
 .de TQ
 .br
@@ -34,26 +42,19 @@ the original English.
 .el .TP "\\$1"
 ..
 .
-.\" Don't use .ne for TTY devices
-.de NE
-.if t .ne \\$1
-..
-.\" The BSD man macros can't handle " in arguments to font change macros,
-.\" so use \(ts instead of ".
-.tr \(ts"
 .
+.\" --------------------------------------------------------------------
+.\" Title
+.\" --------------------------------------------------------------------
 .
 .TH @G@TROFF @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
-.
-.
 .SH NAME
+@g@troff \- the troff processor of the groff text formatting system
 .
 .
-@g@troff \- format documents
-.
-.
+.\" --------------------------------------------------------------------
 .SH SYNOPSIS
-.
+.\" --------------------------------------------------------------------
 .
 .nr a \n(.j
 .ad l
@@ -66,99 +67,71 @@ the original English.
 .el .RB "[\ " "\\$1" "\ ]"
 ..
 .OP \-abcivzCERU
-.OP \-w name
-.OP \-W name
 .OP \-d cs
 .OP \-f fam
+.OP \-F dir
 .OP \-m name
+.OP \-M dir
 .OP \-n num
 .OP \-o list
 .OP \-r cn
 .OP \-T name
-.OP \-F dir
-.OP \-M dir
+.OP \-w name
+.OP \-W name
 .RI "[\ " files\|.\|.\|. "\ ]"
 .br
 .ad \na
-.PP
-It is possible to have whitespace between a command line option and its
-parameter.
+.P
+It is possible to have whitespace between a command line option and
+its parameter.
 .
 .
+.\" --------------------------------------------------------------------
 .SH DESCRIPTION
-.
+.\" --------------------------------------------------------------------
 .
 This manual page describes the GNU version of
-.BR troff ,
-which is part of the groff document formatting system.
-It is highly compatible with UNIX troff.
-Usually it should be invoked using the groff command, which will
-also run preprocessors and postprocessors in the appropriate
-order and with the appropriate options.
-.
-.
+.BR troff .
+It is part of the groff document formatting system.
+It is functionally compatible with UNIX troff, but has many extensions,
+see
+.BR \%groff_differences (@MAN7EXT@).
+Usually it should be invoked using the
+.BR groff (@MAN1EXT@)
+command which will also run preprocessors and postprocessors in the
+appropriate order and with the appropriate options.
+.
+.
+.\" --------------------------------------------------------------------
 .SH OPTIONS
-.
+.\" --------------------------------------------------------------------
 .
 .TP \w'\-dname=s'u+2n
 .B \-a
 Generate an
 .SM ASCII
 approximation of the typeset output.
+.
 .TP
 .B \-b
-Print a backtrace with each warning or error message.  This backtrace
-should help track down the cause of the error.  The line numbers given
-in the backtrace may not always be correct:
-.BR troff 's
-idea of line numbers
-gets confused by
+Print a backtrace with each warning or error message.
+This backtrace should help track down the cause of the error.
+The line numbers given in the backtrace may not always be correct, for
+.BR @g@troff 's
+idea of line numbers gets confused by
 .B as
 or 
 .B am
 requests.
+.
 .TP
 .B \-c
 Disable color output (always disabled in compatibility mode).
-.TP
-.B \-i
-Read the standard input after all the named input files have been
-processed.
-.TP
-.B \-v
-Print the version number.
-.TP
-.BI \-w name
-Enable warning
-.IR  name .
-Available warnings are described in
-the Warnings subsection below.
-Multiple
-.B \-w
-options are allowed.
-.TP
-.BI \-W name
-Inhibit warning
-.IR name .
-Multiple
-.B \-W
-options are allowed.
-.TP
-.B \-E
-Inhibit all error messages of
-.BR @g@troff .
-Note that this doesn't affect messages output to standard error by
-macro packages using the
-.B .tm
-or
-.B .tm1
-requests.
-.TP
-.B \-z
-Suppress formatted output.
+.
 .TP
 .B \-C
 Enable compatibility mode.
+.
 .TP
 .BI \-d cs
 .TQ
@@ -171,11 +144,41 @@ to be a string
 .IR s ;
 .I c
 must be a one letter name.
+.
+.TP
+.B \-E
+Inhibit all error messages of
+.BR @g@troff .
+Note that this doesn't affect messages output to standard error by macro
+packages using the
+.B tm
+or
+.B tm1
+requests.
+.
 .TP
 .BI \-f fam
 Use
 .I fam
 as the default font family.
+.
+.TP
+.BI \-F dir
+Search in directory (or directory path)
+.I dir
+for subdirectories
+.BI dev name
+.RI ( name
+is the name of the device) and there for the
+.B DESC
+file and font files.
+.I dir
+is scanned before all other font directories.
+.
+.TP
+.B \-i
+Read the standard input after all the named input files have been processed.
+.
 .TP
 .BI \-m name
 Read in the file
@@ -185,34 +188,31 @@ If it isn't found, try
 instead.
 It will be first searched for in directories given with the
 .B \-M
-command line option, then in directories given
-in the
+command line option, then in directories given in the
 .B GROFF_TMAC_PATH
 environment variable, then in the current directory (only if in unsafe
 mode), the home directory, @SYSTEMMACRODIR@, @LOCALMACRODIR@, and
 @MACRODIR@.
+.
 .TP
-.B \-U
-Unsafe mode.
-This will enable the following requests:
-.BR .open ,
-.BR .opena ,
-.BR .pso ,
-.BR .sy ,
-and
-.BR .pi .
-For security reasons, these potentially dangerous requests are disabled
-otherwise.  It will also add the current directory to the macro search path.
+.BI \-M dir
+Search directory (or directory path)
+.I dir
+for macro files.
+This is scanned before all other macro directories.
+.
 .TP
 .B \-R
 Don't load
 .B troffrc
 and
 .BR troffrc-end .
+.
 .TP
 .BI \-n num
 Number the first page
 .IR num .
+.
 .TP
 .BI \-o list
 Output only pages in
@@ -232,8 +232,9 @@ means print every page up to
 .IB n \-
 means print every page from
 .IR n .
-.B Troff
+.B @g@troff
 will exit after printing the last page in the list.
+.
 .TP
 .BI \-r cn
 .TQ
@@ -248,2102 +249,217 @@ to
 must be a one character name;
 .I n
 can be any troff numeric expression.
+.
 .TP
 .BI \-T name
 Prepare output for device
 .IR name ,
 rather than the default
 .BR @DEVICE@ .
-.TP
-.BI \-F dir
-Search in directory (or directory path)
-.I dir
-for subdirectories
-.BI dev name
-.RI ( name
-is the name of the device) and there for the
-.B DESC
-file and font files.
-.I dir
-is scanned before all other font directories.
-.TP
-.BI \-M dir
-Search directory (or directory path)
-.I dir
-for macro files.
-This is scanned before all other macro directories.
-.
-.
-.SH USAGE
-.
-.
-Only the features not in UNIX troff are described here.
 .
-.SS Long names
-.
-The names of number registers, fonts, strings/\:macros/\:diversions,
-special characters, and colors can be of any length.
-In escape sequences, where you can use 
-.BI ( xx
-for a two character name, you can use
-.BI [ xxx ]
-for a name of arbitrary length:
-.TP
-.BI \e[ xxx ]
-Print the special character called
-.IR xxx .
-.TP
-.BI \ef[ xxx ]
-Set font
-.IR xxx .
-.TP
-.BI \e*[ xxx ]
-Interpolate string
-.IR xxx .
 .TP
-.BI \en[ xxx ]
-Interpolate number register
-.IR xxx .
-.
-.SS Fractional pointsizes
-.
-A
-.I
-scaled point
-is equal to 1/sizescale
-points, where
-sizescale is specified in the
-.B DESC
-file (1 by default).
-There is a new scale indicator
-.B z
-which has the effect of multiplying by sizescale.
-Requests and escape sequences in troff 
-interpret arguments that represent a pointsize as being in units
-of scaled points, but they evaluate each such argument
-using a default scale indicator of
-.BR z .
-Arguments treated in this way are
-the argument to the
-.B ps
-request,
-the third argument to the
-.B cs
-request,
-the second and fourth arguments to the
-.B tkf
-request,
-the argument to the
-.B \eH
-escape sequence,
-and those variants of the
-.B \es
-escape sequence that take a numeric expression as their argument.
-.LP
-For example, suppose sizescale is 1000;
-then a scaled point will be equivalent to a millipoint;
-the request
-.B .ps 10.25
-is equivalent to
-.B .ps 10.25z
-and so sets the pointsize to 10250 scaled points,
-which is equal to 10.25 points.
-.LP
-The number register
-.B \en[.s]
-returns the pointsize in points as decimal fraction.
-There is also a new number register
-.B \en[.ps]
-that returns the pointsize in scaled points.
-.LP
-It would make no sense to use the
-.B z
-scale indicator in a numeric expression
-whose default scale indicator was neither
-.B u
-nor
-.BR z ,
-and so
-.B troff
-disallows this.
-Similarly it would make no sense to use a scaling indicator
-other than
-.B z
-or
-.B u
-in a numeric expression whose default scale indicator was
-.BR z ,
-and so
-.B troff
-disallows this as well.
-.LP
-There is also new scale indicator
-.B s
-which multiplies by the number of units in a scaled point.
-So, for example,
-.B \en[.ps]s
-is equal to
-.BR 1m .
-Be sure not to confuse the
-.B s
-and
-.B z
-scale indicators.
-.
-.SS Numeric expressions
-.
-.LP
-Spaces are permitted in a number expression within parentheses.
-.LP
-.B M
-indicates a scale of 100ths of an em.
-.B f
-indicates a scale of 65536 units, providing fractions for color definitions
-with
-.B defcolor
-request.
-For example, 0.5f = 32768u.
-.TP
-.IB e1 >? e2
-The maximum of
-.I e1
-and
-.IR e2 .
-.TP
-.IB e1 <? e2
-The minimum of
-.I e1
+.B \-U
+Unsafe mode.
+This will enable the following requests:
+.BR open ,
+.BR opena ,
+.BR pso ,
+.BR sy ,
 and
-.IR e2 .
-.TP
-.BI ( c ; e )
-Evaluate
-.I e
-using
-.I c
-as the default scaling indicator.
-If
-.I c
-is missing, ignore scaling indicators in the evaluation of
-.IR e .
-.
-.SS New escape sequences
+.BR pi .
+For security reasons, these potentially dangerous requests are disabled
+otherwise.
+It will also add the current directory to the macro search path.
 .
 .TP
-.BI \eA' anything '
-This expands to
-.B 1
-or
-.B 0
-according as
-.I anything
-is or is not acceptable as the name of a string, macro, diversion,
-number register, environment or font.
-It will return
-.B 0
-if
-.I anything
-is empty.
-This is useful if you want to lookup user input in some sort of
-associative table.
-.TP
-.BI \eB' anything '
-This expands to
-.B 1
-or
-.B 0
-according as
-.I anything
-is or is not a valid numeric expression.
-It will return
-.B 0
-if
-.I anything
-is empty.
-.TP
-.BI \eC' xxx '
-Typeset character named
-.IR xxx .
-Normally it is more convenient to use
-.BI \e[ xxx ]\fR.
-But
-.B \eC
-has the advantage that it is compatible with recent versions of
-.SM UNIX
-and is available in compatibility mode.
-.TP
-.B \eE
-This is equivalent to an escape character,
-but it's not interpreted in copy-mode.
-For example, strings to start and end superscripting could be defined
-like this:
-.RS
-.IP
-\&.ds { \ev'\-.3m'\es'\eEn[.s]*6u/10u'
-.br
-\&.ds } \es0\ev'.3m'
-.LP
-The use of
-.B \eE
-ensures that these definitions will work even if
-.B \e*{
-gets interpreted in copy-mode
-(for example, by being used in a macro argument).
-.RE
-.TP
-.BI \em x
-.TQ
-.BI \em( xx
-.TQ
-.BI \em[ xxx ]
-Set drawing color.
-.B \emP
-switches back to the previous color.
-.TP
-.BI \eM x
-.TQ
-.BI \eM( xx
-.TQ
-.BI \eM[ xxx ]
-Set background color for filled objects drawn with the
-.BI \eD' ... '
-commands.
-.B \eMP
-switches back to the previous color.
-.TP
-.BI \eN' n '
-Typeset the character with code
-.I n
-in the current font.
-.I n
-can be any integer.
-Most devices only have characters with codes between 0 and 255.
-If the current font does not contain a character with that code,
-special fonts will
-.I not
-be searched.
-The
-.B \eN
-escape sequence can be conveniently used on conjunction with the
-.B char
-request:
-.RS
-.IP
-.B
-\&.char \e[phone] \ef(ZD\eN'37'
-.RE
-.IP
-The code of each character is given in the fourth column in the font
-description file after the
-.B charset
-command.
-It is possible to include unnamed characters in the font description
-file by using a name of
-.BR \-\-\- ;
-the
-.B \eN
-escape sequence is the only way to use these.
-.TP
-.BI \eR' name\ \(+-n '
-This has the same effect as
-.RS
-.IP
-.BI .nr\  name\ \(+-n
-.RE
-.TP
-.BI \es( nn
-.TQ
-.BI \es\(+-( nn
-Set the point size to
-.I nn
-points;
-.I nn
-must be exactly two digits.
-.TP
-.BI \es[\(+- n ]
-.TQ
-.BI \es\(+-[ n ]
-.TQ
-.BI \es'\(+- n '
-.TQ
-.BI \es\(+-' n '
-Set the point size to
-.I n
-scaled points;
-.I n
-is a numeric expression with a default scale indicator of
-.BR z .
-.TP
-.BI \eV x
-.TQ
-.BI \eV( xx
-.TQ
-.BI \eV[ xxx ]
-Interpolate the contents of the environment variable
-.IR xxx ,
-as returned by
-.BR getenv (3).
-.B \eV
-is interpreted in copy-mode.
-.TP
-.BI \eY x
-.TQ
-.BI \eY( xx
-.TQ
-.BI \eY[ xxx ]
-This is approximately equivalent to
-.BI \eX'\e*[ xxx ]'\fR.
-However the contents of the string or macro
-.I xxx
-are not interpreted;
-also it is permitted for
-.I xxx
-to have been defined as a macro and thus contain newlines
-(it is not permitted for the argument to
-.B \eX
-to contain newlines).
-The inclusion of newlines requires an extension to the UNIX troff output
-format, and will confuse drivers that do not know about this
-extension.
-.TP
-.BI \eZ' anything '
-Print anything and then restore the horizontal and vertical
-position;
-.I anything
-may not contain tabs or leaders.
-.TP
-.B \e$0
-The name by which the current macro was invoked.
-The
-.B als
-request can make a macro have more than one name.
-.TP
-.B \e$*
-In a macro, the concatenation of all the arguments separated by spaces.
-.TP
-.B \e$@
-In a macro, the concatenation of all the arguments with each surrounded by
-double quotes, and separated by spaces. 
-.TP
-.BI \e$( nn
-.TQ
-.BI \e$[ nnn ]
-In a macro, this gives the
-.IR nn -th
-or
-.IR nnn -th
-argument.
-Macros can have an unlimited number of arguments.
-.TP
-.BI \e? anything \e?
-When used in a diversion, this will transparently embed
-.I anything
-in the diversion.
-.I anything
-is read in copy mode.
-When the diversion is reread,
-.I anything
-will be interpreted.
-.I anything
-may not contain newlines; use
-.B \e!\&
-if you want to embed newlines in a diversion.
-The escape sequence
-.B \e?\&
-is also recognised in copy mode and turned into a single internal
-code; it is this code that terminates
-.IR anything .
-Thus
-.RS
-.IP
-.NE 14v+\n(.Vu
-.ft B
-.nf
-\&.nr x 1
-\&.nf
-\&.di d
-\e?\e\e?\e\e\e\e?\e\e\e\e\e\e\e\enx\e\e\e\e?\e\e?\e?
-\&.di
-\&.nr x 2
-\&.di e
-\&.d
-\&.di
-\&.nr x 3
-\&.di f
-\&.e
-\&.di
-\&.nr x 4
-\&.f
-.fi
-.ft
-.RE
-.IP
-will print
-.BR 4 .
-.TP
-.B \e/
-This increases the width of the preceding character so that
-the spacing between that character and the following character
-will be correct if the following character is a roman character.
-For example, if an italic f is immediately followed by a roman
-right parenthesis, then in many fonts the top right portion of the f
-will overlap the top left of the right parenthesis producing \fIf\fR)\fR,
-which is ugly.
-Inserting
-.B \e/
-produces
-.ie \n(.g \fIf\/\fR)\fR
-.el \fIf\|\fR)\fR
-and avoids this problem.
-It is a good idea to use this escape sequence whenever an
-italic character is immediately followed by a roman character without any
-intervening space.
-.TP
-.B \e,
-This modifies the spacing of the following character so that the spacing
-between that character and the preceding character will correct if
-the preceding character is a roman character.
-For example, inserting
-.B \e,
-between the parenthesis and the f changes
-\fR(\fIf\fR to
-.ie \n(.g \fR(\,\fIf\fR.
-.el \fR(\^\fIf\fR.
-It is a good idea to use this escape sequence whenever a
-roman character is immediately followed by an italic character without any
-intervening space.
-.TP
-.B \e)
-Like
-.B \e&
-except that it behaves like a character declared with the
-.B cflags
-request to be transparent for the purposes of end of sentence recognition.
-.TP
-.B \e~
-This produces an unbreakable space that stretches like a normal inter-word
-space when a line is adjusted.
-.TP
-.B \e:
-This causes the insertion of a zero-width break point.
-It is equal to
-.B \e%
-but without insertion of a soft hyphen character.
-.TP
-.B \e#
-Everything up to and including the next newline is ignored.
-This is interpreted in copy mode.
-This is like
-.B \e"
-except that
-.B \e"
-does not ignore the terminating newline.
-.
-.SS New requests
+.B \-v
+Print the version number.
 .
 .TP
-.BI .aln\  xx\ yy
-Create an alias
-.I xx
-for number register object named
-.IR yy .
-The new name and the old name will be exactly equivalent.
-If
-.I yy
-is undefined, a warning of type
-.B reg
-will be generated, and the request will be ignored.
-.TP
-.BI .als\  xx\ yy
-Create an alias
-.I xx
-for request, string, macro, or diversion object named
-.IR yy .
-The new name and the old name will be exactly equivalent (it is similar to a
-hard rather than a soft link).
-If
-.I yy
-is undefined, a warning of type
-.B mac
-will be generated, and the request will be ignored.
-The
-.BR de ,
-.BR am ,
-.BR di ,
-.BR da ,
-.BR ds ,
-and
-.B as
-requests only create a new object if the name of the macro, diversion
-or string diversion is currently undefined or if it is defined to be a
-request; normally they modify the value of an existing object.
-.TP
-.BI .am1\  xx\ yy
-Similar to
-.BR .am , 
-but compatibility mode is switched off during execution.
-On entry, the current compatibility mode is saved and restored at exit.
-.TP
-.BI .asciify\  xx
-This request `unformats' the diversion
-.I xx
-in such a way that
-.SM ASCII
-and space characters (and some escape sequences) that were formatted and
-diverted into
-.I xx
-will be treated like ordinary input characters when
-.I xx
-is reread.
-Useful for diversions in conjunction with the
-.B .writem
-request.
-It can be also used for gross hacks; for example, this
-.RS
-.IP
-.NE 7v+\n(.Vu
-.ft B
-.nf
-\&.tr @.
-\&.di x
-\&@nr n 1
-\&.br
-\&.di
-\&.tr @@
-\&.asciify x
-\&.x
-.fi
-.RE
-.IP
-will set register
-.B n
-to 1.
-Note that glyph information (font, font size, etc.) is not preserved; use
-.B .unformat
-instead.
-.TP
-.B .backtrace
-Print a backtrace of the input stack on stderr.
-.TP
-.BI .blm\  xx
-Set the blank line macro to
-.IR xx .
-If there is a blank line macro,
-it will be invoked when a blank line is encountered instead of the usual
-troff behaviour.
-.TP
-.BI .box\  xx
-.TQ
-.BI .boxa\  xx
-These requests are similar to the
-.B di
-and
-.B da
-requests with the exception that a partially filled line will not become
-part of the diversion (i.e., the diversion always starts with a new line)
-but restored after ending the diversion, discarding the partially filled
-line which possibly comes from the diversion.
-.TP
-.B .break
-Break out of a while loop.
-See also the
-.B while
-and
-.B continue
-requests.
-Be sure not to confuse this with the
-.B br
-request.
-.TP
-.B .brp
-This is the same as
-.BR \ep .
-.TP
-.BI .cflags\  n\ c1\ c2\|.\|.\|.
-Characters
-.IR c1 ,
-.IR c2 ,\|.\|.\|.
-have properties determined by
-.IR n ,
-which is ORed from the following:
-.RS
-.TP
-1
-the character ends sentences
-(initially characters
-.B .?!\&
-have this property);
-.TP
-2
-lines can be broken before the character
-(initially no characters have this property);
-a line will not be broken at a character with this property
-unless the characters on each side both have non-zero
-hyphenation codes.
-.TP
-4
-lines can be broken after the character
-(initially characters
-.B \-\e(hy\e(em
-have this property);
-a line will not be broken at a character with this property
-unless the characters on each side both have non-zero
-hyphenation codes.
-.TP
-8
-the character overlaps horizontally
-(initially characters
-.B \e(ul\e(rn\e(ru
-have this property);
-.TP
-16
-the character overlaps vertically
-(initially character
-.B \e(br
-has this property);
-.TP
-32
-an end of sentence character followed by any number of characters
-with this property will be treated
-as the end of a sentence if followed by a newline or two spaces;
-in other words
-the character is transparent for the purposes of end of sentence
-recognition;
-this is the same as having a zero space factor in \*(tx
-(initially characters
-.B \(ts')]*\e(dg\e(rq
-have this property).
-.RE
-.TP
-.BI .char\  c\ string
-Define character
-.I c
-to be
-.IR string .
-Every time character
-.I c
-needs to be printed,
-.I string
-will be processed in a temporary environment and the result
-will be wrapped up into a single object.
-Compatibility mode will be turned off
-and the escape character will be set to
-.B \e
-while
-.I string
-is being processed.
-Any emboldening, constant spacing or track kerning will be applied
-to this object rather than to individual characters in
-.IR string .
-A character defined by this request can be used just like
-a normal character provided by the output device.
-In particular other characters can be translated to it
-with the
-.B tr
-request;
-it can be made the leader character by the
-.B lc
-request;
-repeated patterns can be drawn with the character using the
-.B \el
-and
-.B \eL
-escape sequences;
-words containing the character can be hyphenated
-correctly, if the
-.B hcode
-request is used to give the character a hyphenation code.
-There is a special anti-recursion feature: 
-use of character within the character's definition
-will be handled like normal characters not defined with
-.BR char .
-A character definition can be removed with the
-.B rchar
-request.
-.TP
-.BI .chop\  xx
-Chop the last character off macro, string, or diversion
-.IR xx .
-This is useful for removing the newline from the end of diversions
-that are to be interpolated as strings.
-.TP
-.BI .close\  stream
-Close the stream named
-.IR stream ;
-.I stream
-will no longer be an acceptable argument to the
-.B write
-request.
-See the
-.B open
-request.
-.TP
-.B .continue
-Finish the current iteration of a while loop.
-See also the
-.B while
-and
-.B break
-requests.
-.TP
-.BI .cp\  n
-If
-.I n
-is non-zero or missing, enable compatibility mode, otherwise
-disable it.
-In compatibility mode, long names are not recognised, and the
-incompatibilities caused by long names do not arise.
-.TP
-.BI .defcolor\  xxx\ scheme\ color_components
-Define color.
-.I scheme
-can be one of the following values:
-.B rgb
-(three components),
-.B cym
-(three components),
-.B cmyk
-(four components), and
-.B gray
-or
-.B grey
-(one component).
-Color components can be given either as a hexadecimal string or as positive
-decimal integers in the range 0-65535.
-A hexadecimal string contains all color components concatenated.
-It must start with either
-.B #
-or
-.BR ## ;
-the former specifies hex values in the range 0-255 (which are internally
-multiplied by\~257), the latter in the range 0-65535.
-Examples: #FFC0CB (pink), ##ffff0000ffff (magenta).
-A new scaling indicator
-.B f
-has been introduced which multiplies its value by 65536; this makes it
-convenient to specify color components as fractions in the range 0 to\~1.
-Example:
-.RS
-.IP
-.B
-\&.defcolor darkgreen rgb 0.1f 0.5f 0.2f
-.RE
-.IP
-Note that
-.B f
-is the default scaling indicator for the
-.B defcolor
-request, thus the above statement is equivalent to
-.RS
-.IP
-.B
-\&.defcolor darkgreen rgb 0.1 0.5 0.2
-.RE
-.TP
-.BI .dei\  xx\ yy
-Define macro indirectly.
-The following example
-.RS
-.IP
-.NE 2v+\n(.Vu
-.ft B
-.nf
-\&.ds xx aa
-\&.ds yy bb
-\&.dei xx yy
-.fi
-.RE
-.IP
-is equivalent to
-.RS
-.IP
-.B
-\&.de aa bb
-.RE
-.TP
-.BI .de1\  xx\ yy
-Similar to
-.BR .de , 
-but compatibility mode is switched off during execution.
-On entry, the current compatibility mode is saved and restored at exit.
-.TP
-.BI .do\  xxx
-Interpret
-.I .xxx
-with compatibility mode disabled.
-For example,
-.RS
-.IP
-.B
-\&.do fam T
-.LP
-would have the same effect as
-.IP
-.B
-\&.fam T
-.LP
-except that it would work even if compatibility mode had been enabled.
-Note that the previous compatibility mode is restored before any files
-sourced by
-.I xxx
-are interpreted.
-.RE
-.TP
-.B .ecs
-Save current escape character.
-.TP
-.B .ecr
-Restore escape character saved with
-.BR ecs .
-Without a previous call to
-.BR ecs ,
-.RB ` \e '
-will be the new escape character.
-.TP
-.BI .evc\  xx
-Copy the contents of environment
-.I xx
-to the current environment.
-No pushing or popping of environents will be done.
-.TP
-.BI .fam\  xx
-Set the current font family to
-.IR xx .
-The current font family is part of the current environment.
-If
-.I xx
-is missing, switch back to previous font family.
-See the description of the
-.B sty
-request for more information on font families.
-.TP
-.BI .fspecial\  f\ s1\ s2\|.\|.\|.
-When the current font is
-.IR f ,
-fonts
-.IR s1 ,
-.IR s2 ,\|.\|.\|.
-will be special, that is, they will searched for characters not in
-the current font.
-Any fonts specified in the
-.B special
-request will be searched after fonts specified in the
-.B fspecial
-request.
-.TP
-.BI .ftr\  f\ g
-Translate font
-.I f
-to
-.IR g .
-Whenever a font named
-.I f
-is referred to in
-.B \ef
-escape sequence,
-or in the
-.BR ft ,
-.BR ul ,
-.BR bd ,
-.BR cs ,
-.BR tkf ,
-.BR special ,
-.BR fspecial ,
-.BR fp ,
-or
-.BR sty
-requests,
-font
-.I g
-will be used.
-If
-.I g
-is missing,
-or equal to
-.I f
-then font
-.I f
-will not be translated.
-.TP
-.BI .hcode \ c1\ code1\ c2\ code2\|.\|.\|.
-Set the hyphenation code of character
-.I c1
-to
-.I code1
-and that of
-.I c2
-to
-.IR code2 .
-A hyphenation code must be a single input
-character (not a special character) other than a digit or a space.
-Initially each lower-case letter has a hyphenation code, which
-is itself, and each upper-case letter has a hyphenation code
-which is the lower case version of itself.
-See also the
-.B hpf
-request.
-.TP
-.BI .hla\  lang
-Set the current hyphenation language to
-.IR lang .
-Hyphenation exceptions specified with the
-.B hw
-request and hyphenation patterns specified with the
-.B hpf
-request are both associated with the current hyphenation language.
-The
-.B hla
-request is usually invoked by the
-.B troffrc
-file.
-.TP
-.BI .hlm\  n
-Set the maximum number of consecutive hyphenated lines to
-.IR n .
-If
-.I n
-is negative, there is no maximum.
-The default value is \-1.
-This value is associated with the current environment.
-Only lines output from an environment count towards the maximum associated
-with that environment.
-Hyphens resulting from
-.B \e%
-are counted; explicit hyphens are not.
-.TP
-.BI .hpf\  file
-Read hyphenation patterns from
-.IR file ;
-this will be searched for in the same way that
-.IB name .tmac
-is searched for when the
-.BI \-m name
-option is specified.
-It should have the same format as the argument to
-the \epatterns primitive in \*(tx;
-the letters appearing in this file are interpreted as hyphenation
-codes.
-A
-.B %
-character in the patterns file introduces a comment that continues
-to the end of the line.
-The set of hyphenation patterns is associated with the current language
-set by the
-.B hla
-request.
-The
-.B hpf
-request
-is usually invoked by the
-.B troffrc
-file.
-.TP
-.BI .hym\  n
-Set the
-.I hyphenation margin
-to
-.IR n :
-when the current adjustment mode is not
-.BR b ,
-the line will not be hyphenated if the line is no more than
-.I n
-short.
-The default hyphenation margin is 0.
-The default scaling indicator for this request is
-.IR m .
-The hyphenation margin is associated with the current environment.
-The current hyphenation margin is available in the
-.B \en[.hym]
-register.
-.TP
-.BI .hys\  n
-Set the
-.I hyphenation space
-to
-.IR n :
-when the current adjustment mode is
-.B b
-don't hyphenate the line if the line can be justified by adding no more than
-.I n
-extra space to each word space.
-The default hyphenation space is 0.
-The default scaling indicator for this request is
-.BR m .
-The hyphenation space is associated with the current environment.
-The current hyphenation space is available in the
-.B \en[.hys]
-register.
-.TP
-.BI .kern\  n
-If
-.I n
-is non-zero or missing, enable pairwise kerning, otherwise disable it.
-.TP
-.BI .length\  xx\ string
-Compute the length of
-.I string
-and return it in the number register
-.I xx
-(which is not necessarily defined before).
-.TP
-.BI .linetabs\  n
-If
-.I n
-is non-zero or missing, enable line-tabs mode, otherwise disable it (which
-is the default).
-In line-tabs mode, tab distances are computed relative to the (current)
-output line.
-Otherwise they are taken relative to the input line.
-For example, the following
-.RS
-.IP
-.NE 6v+\n(.Vu
-.ft B
-.nf
-\&.ds x a\et\ec
-\&.ds y b\et\ec
-\&.ds z c
-\&.ta 1i 3i
-\e*x
-\e*y
-\e*z
-.fi
-.RE
-.IP
-yields
-.RS
-.IP
-a         b         c
-.RE
-.IP
-In line-tabs mode, the same code gives
-.RS
-.IP
-a         b                   c
-.RE
-.IP
-Line-tabs mode is associated with the current environment; the read-only
-number register
-.B \\en[.linetabs]
-is set to\~1 if in line-tabs mode, and 0 otherwise.
-.TP
-.BI .mso\  file
-The same as the
-.B so
-request except that
-.I file
-is searched for in the same directories as macro files for the
-the
-.B \-m
-command line option.
-If the file name to be included
-has the form
-.IB name .tmac
-and it isn't found,
-.B mso
-tries to include
-.BI tmac. name
-instead and vice versa.
-.TP
-.BI .nop \ anything
-Execute
-.IR anything .
-This is similar to `.if\ 1'.
-.TP
-.B .nroff
-Make the
-.B n
-built-in condition true
-and the
-.B t
-built-in condition false.
-This can be reversed using the
-.B troff
-request.
-.TP
-.BI .open\  stream\ filename
-Open
-.I filename
-for writing and associate the stream named
-.I stream
-with it.
-See also the
-.B close
-and
-.B write
-requests.
-.TP 
-.BI .opena\  stream\ filename
-Like
-.BR open ,
-but if
-.I filename
-exists, append to it instead of truncating it.
-.TP
-.B .pnr
-Print the names and contents of all currently defined number registers
-on stderr.
-.TP
-.BI .psbb \ filename
-Get the bounding box of a PostScript image
-.IR filename .
-This file must conform to Adobe's Document Structuring Conventions; the
-command looks for a
-.B %%BoundingBox
-comment to extract the bounding box values.
-After a successful call, the coordinates (in PostScript units) of the lower
-left and upper right corner can be found in the registers
-.BR \en[llx] ,
-.BR \en[lly] ,
-.BR \en[urx] ,
-and
-.BR \en[ury] ,
-respectively.
-If some error has occurred, the four registers are set to zero.
-.TP
-.BI .pso \ command
-This behaves like the
-.B so
-request except that input comes from the standard output of
-.IR command .
-.TP
-.B .ptr
-Print the names and positions of all traps (not including input line
-traps and diversion traps) on stderr.  Empty slots in the page trap
-list are printed as well, because they can affect the priority of
-subsequently planted traps.
-.TP
-.BI .rchar\  c1\ c2\|.\|.\|.
-Remove the definitions of characters
-.IR c1 ,
-.IR c2 ,\|.\|.\|.
-This undoes the effect of a
-.B char
-request.
-.TP
-.B .return
-Within a macro, return immediately.
-No effect otherwise.
-.TP
-.B .rj
-.TQ
-.BI .rj\  n
-Right justify the next
-.I n
-input lines.
-Without an argument right justify the next input line.
-The number of lines to be right justified is available in the
-.B \en[.rj]
-register.
-This implicitly does
-.BR .ce\ 0 .
-The
-.B ce
-request implicitly does
-.BR .rj\ 0 .
-.TP
-.BI .rnn \ xx\ yy
-Rename number register
-.I xx
-to
-.IR yy .
-.TP
-.BI .shc\  c
-Set the soft hyphen character to
-.IR c .
-If
-.I c
-is omitted,
-the soft hyphen character will be set to the default
-.BR \e(hy .
-The soft hyphen character is the character which will be inserted
-when a word is hyphenated at a line break.
-If the soft hyphen character does not exist in the font of the character
-immediately preceding a potential break point,
-then the line will not be broken at that point.
-Neither definitions (specified with the
-.B char
-request)
-nor translations (specified with the
-.B tr
-request)
-are considered when finding the soft hyphen character.
-.TP
-.BI .shift\  n
-In a macro, shift the arguments by
-.I n
-positions:
-argument
-.I i
-becomes argument
-.IR i \- n ;
-arguments 1 to
-.I n
-will no longer be available.
-If
-.I n
-is missing,
-arguments will be shifted by 1.
-Shifting by negative amounts is currently undefined.
-.TP
-.BI .special\  s1\ s2\|.\|.\|.
-Fonts
-.IR s1 ,
-.IR s2 ,
-are special and will be searched for characters not in the
-current font.
-.TP
-.BI .sty\  n\ f
-Associate style
-.I f
-with font position
-.IR n .
-A font position can be associated either with a font or
-with a style.
-The current font is the index of a font position and so is also
-either a font or a style.
-When it is a style, the font that is actually used is the font the
-name of which is the concatenation of the name of the current family
-and the name of the current style.
-For example, if the current font is 1 and font position 1 is
-associated with style
-.B R
-and the current
-font family is
-.BR T ,
-then font
-.BR TR
-will be used.
-If the current font is not a style, then the current family is ignored.
-When the requests
-.BR cs ,
-.BR bd ,
-.BR tkf ,
-.BR uf ,
-or
-.B fspecial
-are applied to a style,
-then they will instead be applied to the member of the
-current family corresponding to that style.
-The default family can be set with the
-.B \-f
-option.
-The styles command in the
-.SM DESC
-file controls which font positions
-(if any) are initially associated with styles rather than fonts.
-.TP
-.BI .substring\  xx\ n1\  [ n2 ]
-Replace the string in register
-.I xx
-with the substring defined by the indices
-.I n1
-and
-.IR n2 .
-The first character in the string has index one.
-If
-.I n2
-is omitted, it is taken to be equal to the string's length.  If the
-index value
-.I n1
-or
-.I n2
-is negative or zero, it will be counted from the end of the string,
-going backwards: The last character has index 0, the character before
-the last character has index -1, etc.
-.TP
-.BI .tkf\  f\ s1\ n1\ s2\ n2
-Enable track kerning for font
-.IR f .
-When the current font is
-.I f
-the width of every character will be increased by an amount
-between
-.I n1
-and
-.IR n2 ;
-when the current point size is less than or equal to
-.I s1
-the width will be increased by
-.IR n1 ;
-when it is greater than or equal to
-.I s2
-the width will be increased by
-.IR n2 ;
-when the point size is greater than or equal to
-.I s1
-and less than or equal to
-.I s2
-the increase in width is a linear function of the point size.
-.TP
-.BI .tm1\  string
-Similar to the
-.B tm
-request,
-.I string
-is read in copy mode and written on the standard error, but an initial
-double quote in
-.I string
-is stripped off to allow initial blanks.
-.TP
-.BI .tmc\  string
-Similar to
-.BR tm1
-but without writing a final newline.
-.TP
-.BI .trf\  filename
-Transparently output the contents of file
-.IR filename .
-Each line is output as it would be were it preceded by
-.BR \e! ;
-however, the lines are not subject to copy-mode interpretation.
-If the file does not end with a newline, then a newline will
-be added.
-For example, you can define a macro
-.I x
-containing the contents of file
-.IR f ,
-using
-.RS
-.IP
-.BI .di\  x
-.br
-.BI .trf\  f
-.br
-.B .di
-.LP
-Unlike with the
-.B cf
-request,
-the file cannot contain characters such as
-.SM NUL
-that are not legal troff input characters.
-.RE
-.TP
-.B .trnt abcd
-This is the same as the
-.B tr
-request except that the translations do not apply to text that is
-transparently throughput into a diversion with
-.BR \e! .
-For example,
-.RS
-.IP
-.nf
-.ft B
-\&.tr ab
-\&.di x
-\e!.tm a
-\&.di
-\&.x
-.fi
-.ft
-.LP
-will print
-.BR b ;
-if
-.B trnt
-is used instead of
-.B tr
-it will print
-.BR a .
-.RE
-.TP
-.B .troff
-Make the
-.B n
-built-in condition false,
-and the
-.B t
-built-in condition true.
-This undoes the effect of the
-.B nroff
-request.
-.TP
-.BI .unformat\  xx
-This request `unformats' the diversion
-.IR xx .
-Contrary to the
-.B .asciify
-request, which tries to convert formatted elements of the diversion back
-to input tokens as much as possible,
-.B .unformat
-will only handle tabs and spaces between words (usually caused by spaces
-or newlines in the input) specially.
-The former are treated as if they were input tokens, and the latter are
-stretchable again.
-Note that the vertical size of lines is not preserved.
-Glyph information (font, font size, space width, etc.) is retained.
-Useful in conjunction with the
-.B .box
-and
-.B .boxa
-requests.
-.TP
-.BI .vpt\  n
-Enable vertical position traps if
-.I n
-is non-zero, disable them otherwise.
-Vertical position traps are traps set by the
-.B wh
-or
-.B dt
-requests.
-Traps set by the
-.B it
-request are not vertical position traps.
-The parameter that controls whether vertical position traps are enabled
-is global.
-Initially vertical position traps are enabled.
-.TP
-.BI .warn\  n
-Control warnings.
-.I n
-is the sum of the numbers associated with each warning that is to be enabled;
-all other warnings will be disabled.
-The number associated with each warning is listed in the `Warnings' section.
-For example,
-.B .warn 0
-will disable all warnings, and
-.B .warn 1
-will disable all warnings except that about missing characters.
-If
-.I n
-is not given,
-all warnings will be enabled.
-.TP
-.BI .while \ c\ anything
-While condition
-.I c
-is true, accept
-.I anything
-as input;
-.I c
-can be any condition acceptable to an
-.B if
-request;
-.I anything
-can comprise multiple lines if the first line starts with
-.B \e{
-and the last line ends with
-.BR \e} .
-See also the
-.B break
-and
-.B continue
-requests.
-.TP
-.BI .write\  stream\ anything
-Write
-.I anything
-to the stream named
-.IR stream .
-.I stream
-must previously have been the subject of an
-.B open
-request.
-.I anything
-is read in copy mode;
-a leading
-.B \(ts
-will be stripped.
-.TP
-.BI .writem\  stream\ xx
-Write the contents of the macro or string
-.I xx
-to the stream named
-.IR stream .
-.I stream
-must previously have been the subject of an
-.B open
-request.
-.I xx
-is read in copy mode.
-.
-.SS Extended requests
+.BI \-w name
+Enable warning
+.IR  name .
+Available warnings are described in the section
+.I WARNINGS
+below.
+For example, to enable all warnings, use
+.B \-w
+.BR all .
+Multiple
+.B \-w
+options are allowed.
 .
 .TP
-.BI .cf\  filename
-When used in a diversion, this will embed in the diversion an object which,
-when reread, will cause the contents of
-.I filename
-to be transparently copied through to the output.
-In UNIX troff, the
-contents of
-.I filename
-is immediately copied through to the output regardless of whether
-there is a current diversion; this behaviour is so anomalous that it
-must be considered a bug.
-.TP
-.BI .ev\  xx
-If
-.I xx
-is not a number, this will switch to a named environment called
-.IR xx .
-The environment should be popped with a matching
-.B ev
-request without any arguments, just as for numbered environments.
-There is no limit on the number of named environments; they will be
-created the first time that they are referenced.
-.TP
-.BI .fp\  n\ f1\ f2
-The
-.B fp
-request has an optional third argument.
-This argument gives the external name of the font,
-which is used for finding the font description file.
-The second argument gives the internal name of the font
-which is used to refer to the font in troff after it has been mounted.
-If there is no third argument then the internal name will be used
-as the external name.
-This feature allows you to use fonts with long names in compatibility mode.
-.TP
-.BI .ss\  m\ n
-When two arguments are given to the
-.B ss
-request, the second argument gives the
-.IR "sentence space size" .
-If the second argument is not given, the sentence space size
-will be the same as the word space size.
-Like the word space size, the sentence space is in units of
-one twelfth of the spacewidth parameter for the current font.
-Initially both the word space size and the sentence
-space size are 12.
-Contrary to UNIX troff, GNU troff handles this request in nroff mode
-also; a given value is then rounded down to the nearest multiple of\~12.
-The sentence space size is used in two circumstances:
-if the end of a sentence occurs at the end of a line in fill mode, then
-both an inter-word space and a sentence space will be added;
-if two spaces follow the end of a sentence in the middle of a line,
-then the second space will be a sentence space.
-Note that the behaviour of UNIX troff will be exactly
-that exhibited by GNU troff if a second argument is never given to the
-.B ss
-request.
-In GNU troff, as in UNIX troff, you should always
-follow a sentence with either a newline or two spaces.
-.TP
-.BI .ta\  n1\ n2\|.\|.\|.nn \ T\  r1\ r2\|.\|.\|.\|rn
-Set tabs at positions
-.IR n1 ,
-.IR n2 ,\|.\|.\|.\|,
-.I nn
-and then set tabs at
-.IR nn + r1 ,
-.IR nn + r2 ,\|.\|.\|.\|.\|,
-.IR nn + rn
-and then at
-.IR nn + rn + r1 ,
-.IR nn + rn + r2 ,\|.\|.\|.\|,
-.IR nn + rn + rn ,
-and so on.
-For example,
-.RS
-.IP
-.B
-\&.ta T .5i
-.LP
-will set tabs every half an inch.
-.RE
-.
-.SS New number registers
+.BI \-W name
+Inhibit warning
+.IR name .
+Multiple
+.B \-W
+options are allowed.
 .
-The following read-only registers are available:
 .TP
-.B \en[.C]
-1 if compatibility mode is in effect, 0 otherwise.
-.TP
-.B \en[.cdp]
-The depth of the last character added to the current environment.
-It is positive if the character extends below the baseline.
-.TP
-.B \en[.ce]
-The number of lines remaining to be centered, as set by the
-.B ce
-request.
-.TP
-.B \en[.cht]
-The height of the last character added to the current environment.
-It is positive if the character extends above the baseline.
-.TP
-.B \en[.csk]
-The skew of the last character added to the current environment.
-The
-.I skew
-of a character is how far to the right of the center of a character
-the center of an accent over that character should be placed.
-.TP
-.B \en[.ev]
-The name or number of the current environment.
-This is a string-valued register.
-.TP
-.B \en[.fam]
-The current font family.
-This is a string-valued register.
-.TP
-.B \en[.fp]
-The number of the next free font position.
-.TP
-.B \en[.g]
-Always 1.
-Macros should use this to determine whether they are running
-under GNU troff.
-.TP
-.B \en[.hla]
-The current hyphenation language as set by the
-.B hla
-request.
-.TP
-.B \en[.hlc]
-The number of immediately preceding consecutive hyphenated lines.
-.TP
-.B \en[.hlm]
-The maximum allowed number of consecutive hyphenated lines, as set by the
-.B hlm
-request.
-.TP
-.B \en[.hy]
-The current hyphenation flags (as set by the
-.B hy
-request).
-.TP
-.B \en[.hym]
-The current hyphenation margin (as set by the
-.B hym
-request).
-.TP
-.B \en[.hys]
-The current hyphenation space (as set by the
-.B hys
-request).
-.TP
-.B \en[.in]
-The indent that applies to the current output line.
-.TP
-.B \en[.int]
-Set to a positive value if last output line is interrupted (i.e., if it
-contains
-.IR \ec ).
-.TP
-.B \en[.kern]
-.B 1
-if pairwise kerning is enabled,
-.B 0
-otherwise.
-.TP
-.B \en[.lg]
-The current ligature mode (as set by the
-.B lg
-request).
-.TP
-.B \en[.linetabs]
-The current line-tabs mode (as set by the
-.B linetabs
-request).
-.TP
-.B \en[.ll]
-The line length that applies to the current output line.
-.TP
-.B \en[.lt]
-The title length as set by the
-.B lt
-request.
-.TP
-.B \en[.ne]
-The amount of space that was needed in the last
-.B ne
-request that caused a trap to be sprung.
-Useful in conjunction with the
-.B \en[.trunc]
-register.
-.TP
-.B \en[.ns]
-.B 1
-if no-space mode is active,
-.B 0
-otherwise.
-.TP
-.B \en[.pn]
-The number of the next page:
-either the value set by a
-.B pn
-request, or the number of the current page plus 1.
-.TP
-.B \en[.ps]
-The current pointsize in scaled points.
-.TP
-.B \en[.psr]
-The last-requested pointsize in scaled points.
-.TP
-.B \en[.rj]
-The number of lines to be right-justified as set by the
-.B rj
-request.
-.TP
-.B \en[.sr]
-The last requested pointsize in points as a decimal fraction.
-This is a string-valued register.
-.TP
-.B \en[.tabs]
-A string representation of the current tab settings suitable for use as
-an argument to the
-.B ta
-request.
-.TP
-.B \en[.trunc]
-The amount of vertical space truncated by the most recently sprung
-vertical position trap, or,
-if the trap was sprung by a
-.B ne
-request,
-minus the amount of vertical motion produced by the
-.B ne
-request.
-In other words, at the point a trap is sprung, it represents the difference
-of what the vertical position would have been but for the trap,
-and what the vertical position actually is.
-Useful in conjunction with the
-.B \en[.ne]
-register.
-.TP
-.B \en[.ss]
-.TQ
-.B \en[.sss]
-These give the values of the parameters set by the
-first and second arguments of the
-.B ss
-request.
-.TP
-.B \en[.vpt]
-1 if vertical position traps are enabled, 0 otherwise.
-.TP
-.B \en[.warn]
-The sum of the numbers associated with each of the currently enabled
-warnings.
-The number associated with each warning is listed in the `Warnings'
-subsection.
-.TP
-.B \en[.x]
-The major version number.
-For example, if the version number is
-.B 1.03
-then
-.B \en[.x]
-will contain
-.BR 1 .
-.TP
-.B \en[.y]
-The minor version number.
-For example, if the version number is
-.B 1.03
-then
-.B \en[.y]
-will contain
-.BR 03 .
-.TP
-.B \en[.Y]
-The revision number of groff.
-.TP
-.B \en[llx]
-.TQ
-.B \en[lly]
-.TQ
-.B \en[urx]
-.TQ
-.B \en[ury]
-These four registers are set by the
-.B \&.psbb
-request and contain the bounding box values (in PostScript units) of a given
-PostScript image.
-.LP
-The following read/write registers are set by the
-.B \ew
-escape sequence:
-.TP
-.B \en[rst]
-.TQ
-.B \en[rsb]
-Like the
-.B st
-and
-.B sb
-registers, but takes account of the heights and depths of characters.
-.TP
-.B \en[ssc]
-The amount of horizontal space (possibly negative) that should
-be added to the last character before a subscript.
-.TP
-.B \en[skw]
-How far to right of the center of the last character
-in the
-.B \ew
-argument,
-the center of an accent from a roman font should be placed over that character.
-.LP
-Other available read/write number registers are:
-.TP
-.B \en[c.]
-The current input line number.
-.B \en[.c]
-is a read-only alias to this register.
-.TP
-.B \en[hp]
-The current horizontal position at input line.
-.TP
-.B \en[systat]
-The return value of the system() function executed by the last
-.B sy
-request.
-.TP
-.B \en[slimit]
-If greater than 0, the maximum number of objects on the input stack.
-If less than or equal to 0, there is no limit on the number of objects
-on the input stack.  With no limit, recursion can continue until
-virtual memory is exhausted.
-.TP
-.B \en[year]
-The current year.
-Note that the traditional
-.B troff
-number register
-.B \en[yr]
-is the current year minus 1900.
+.B \-z
+Suppress formatted output.
 .
-.SS Miscellaneous
 .
-.B @g@troff
-predefines a single (read/write) string-based register,
-.BR \e*(.T ,
-which contains the argument given to the
-.B -T
-command line option, namely the current output device (for example,
-.I latin1
-or
-.IR ascii ).
-Note that this is not the same as the (read-only) number register
-.B \en[.T]
-which is defined to be\ 1 if
-.B troff
-is called with the
-.B -T
-command line option, and zero otherwise.  This behaviour is different to
-UNIX troff.
-.LP
-Fonts not listed in the
-.SM DESC
-file are automatically mounted on the next available font position
-when they are referenced.
-If a font is to be mounted explicitly with the
-.B fp
-request on an unused font position,
-it should be mounted on the first unused font position,
-which can be found in the
-.B \en[.fp]
-register;
-although
-.B troff
-does not enforce this strictly,
-it will not allow a font to be mounted at a position whose number is much
-greater than that of any currently used position.
-.LP
-Interpolating a string does not hide existing macro arguments.
-Thus in a macro, a more efficient way of doing
-.IP
-.BI . xx\  \e\e$@
-.LP
-is
-.IP
-.BI \e\e*[ xx ]\e\e  
-.LP
-If the font description file contains pairwise kerning information,
-characters from that font will be kerned.
-Kerning between two characters can be inhibited by placing a
-.B \e&
-between them.
-.LP
-In a string comparison in a condition, 
-characters that appear at different input levels
-to the first delimiter character will not be recognised
-as the second or third delimiters.
-This applies also to the
-.B tl
-request.
-In a
-.B \ew
-escape sequence,
-a character that appears at a different input level to
-the starting delimiter character will not be recognised
-as the closing delimiter character.
-When decoding a macro argument that is delimited
-by double quotes, a character that appears at a different
-input level to the starting delimiter character will not
-be recognised as the closing delimiter character.
-The implementation of
-.B \e$@
-ensures that the double quotes surrounding an argument
-will appear the same input level, which will be different
-to the input level of the argument itself.
-In a long escape name
-.B ]
-will not be recognized as a closing delimiter except
-when it occurs at the same input level as the opening
-.BR ] .
-In compatibility mode, no attention is paid to the input-level.
-.LP
-There are some new types of condition:
-.TP
-.BI .if\ r xxx
-True if there is a number register named
-.IR xxx .
-.TP
-.BI .if\ d xxx
-True if there is a string, macro, diversion, or request named
-.IR xxx .
-.TP
-.BI .if\ m xxx
-True if there is a color named
-.IR xxx .
-.TP
-.BI .if\ c ch
-True if there is a character
-.IR ch
-available;
-.I ch
-is either an
-.SM ASCII
-character
-or a special character
-.BI \e( xx
-or
-.BI \e[ xxx ]\fR;
-the condition will also be true if
-.I ch
-has been defined by the
-.B char
-request.
-.LP
-The
-.B tr
-request can now map characters onto
-.BR \e~ .
-.
-.SS Warnings
+.\" --------------------------------------------------------------------
+.SH WARNINGS
+.\" --------------------------------------------------------------------
 .
 The warnings that can be given by
-.B troff
+.B @g@troff
 are divided into the following categories.
 The name associated with each warning is used by the
 .B \-w
 and
 .B \-W
-options;
-the number is used by the
+options; the number is used by the
 .B warn
 request, and by the
 .B .warn
-register.
-.nr x \w'\fBright-brace'+1n+\w'0000'u
+register; it is always a power of 2 to allow bitwise composition.
+.
+.P
+.TS
+tab(@), center, box;
+c c c | c c c
+r rI lB | r rI lB.
+Bit@Code@Warning@Bit@Code@Warning
+_
+0@1@char@10@1024@reg
+1@2@number@11@2048@tab
+2@4@break@12@4096@right-brace
+3@8@delim@13@8192@missing
+4@16@el@14@16384@input
+5@32@scale@15@32768@escape
+6@64@range@16@65536@space
+7@128@syntax@17@131072@font
+8@256@di@18@262144@ig
+9@512@mac@19@524288@color
+.TE
+.
+.P
+.nr x \w'\fBright-brace'+1n+\w'00000'u
 .ta \nxuR
+.
 .TP \nxu+3n
-.BR char \t1
+.BR char "\t1"
 Non-existent characters.
 This is enabled by default.
+.
 .TP
-.BR number \t2
+.BR number "\t2"
 Invalid numeric expressions.
 This is enabled by default.
+.
 .TP
-.BR break \t4
-In fill mode, lines which could not be broken so that their length was
-less than the line length.
+.BR break "\t4"
+In fill mode, lines which could not be broken so that their length was less
+than the line length.
 This is enabled by default.
+.
 .TP
-.BR delim \t8
+.BR delim "\t8"
 Missing or mismatched closing delimiters.
+.
 .TP
-.BR el \t16
+.BR el "\t16"
 Use of the
 .B el
 request with no matching
 .B ie
 request.
+.
 .TP
-.BR scale \t32
+.BR scale "\t32"
 Meaningless scaling indicators.
+.
 .TP
-.BR range \t64
+.BR range "\t64"
 Out of range arguments.
+.
 .TP
-.BR syntax \t128
+.BR syntax "\t128"
 Dubious syntax in numeric expressions.
+.
 .TP
-.BR di \t256
+.BR di "\t256"
 Use of
 .B di
 or
 .B da
 without an argument when there is no current diversion.
+.
 .TP
-.BR mac \t512
+.BR mac "\t512"
 Use of undefined strings, macros and diversions.
-When an undefined string, macro or diversion is used,
-that string is automatically defined as empty.
-So, in most cases, at most one warning will be given for
-each name.
+When an undefined string, macro or diversion is used, that string is
+automatically defined as empty.
+So, in most cases, at most one warning will be given for each name.
+.
 .TP
-.BR reg \t1024
+.BR reg "\t1024"
 Use of undefined number registers.
-When an undefined number register is used,
-that register is automatically defined to have a value of 0.
-So, in most cases, at most one warning will be given for
-use of a particular name.
+When an undefined number register is used, that register is automatically
+defined to have a value of\~0.
+So, in most cases, at most one warning will be given for use of a particular
+name.
+.
 .TP
-.BR tab \t2048
+.BR tab "\t2048"
 Inappropriate use of a tab character.
-Either use of a tab character where a number was expected,
-or use of tab character in an unquoted macro argument.
+Either use of a tab character where a number was expected, or use of tab
+character in an unquoted macro argument.
+.
 .TP
-.BR right-brace \t4096
+.BR right-brace "\t4096"
 Use of
 .B \e}
 where a number was expected.
+.
 .TP
-.BR missing \t8192
+.BR missing "\t8192"
 Requests that are missing non-optional arguments.
+.
 .TP
-.BR input \t16384
+.BR input "\t16384"
 Illegal input characters.
+.
 .TP
-.BR escape \t32768
+.BR escape "\t32768"
 Unrecognized escape sequences.
-When an unrecognized escape sequence is encountered,
-the escape character is ignored.
+When an unrecognized escape sequence is encountered, the escape character is
+ignored.
+.
 .TP
-.BR space \t65536
+.BR space "\t65536"
 Missing space between a request or macro and its argument.
-This warning will be given 
-when an undefined name longer than two characters is encountered,
-and the first two characters of the name make a defined name.
+This warning will be given when an undefined name longer than two characters
+is encountered, and the first two characters of the name make a defined
+name.
 The request or macro will not be invoked.
 When this warning is given, no macro is automatically defined.
 This is enabled by default.
 This warning will never occur in compatibility mode.
+.
 .TP
-.BR font \t131072
+.BR font "\t131072"
 Non-existent fonts.
 This is enabled by default.
+.
 .TP
-.BR ig \t262144
+.BR ig "\t262144"
 Illegal escapes in text ignored with the
 .B ig
 request.
-These are conditions that are errors when they do not occur
-in ignored text.
+These are conditions that are errors when they do not occur in ignored text.
+.
 .TP
-.BR color \t524288
+.BR color "\t524288"
 Color related warnings.
-.LP
+.P
 There are also names that can be used to refer to groups of warnings:
+.
 .TP
 .B all
 All warnings except
@@ -2351,141 +467,24 @@ All warnings except
 .B mac
 and
 .BR reg .
-It is intended that this covers all warnings
-that are useful with traditional macro packages.
+It is intended that this covers all warnings that are useful with
+traditional macro packages.
+.
 .TP
 .B w
 All warnings.
 .
-.SS Incompatibilities
-.
-.LP
-Long names cause some incompatibilities.
-UNIX troff will interpret
-.IP
-.B
-\&.dsabcd
-.LP
-as defining a string
-.B ab
-with contents
-.BR cd .
-Normally, GNU troff will interpret this as a call of a macro named
-.BR dsabcd .
-Also UNIX troff will interpret
-.B \e*[
-or
-.B \en[
-as references to a string or number register called
-.BR [ .
-In GNU troff, however, this will normally be interpreted as the start
-of a long name.
-In
-.I compatibility mode
-GNU troff will interpret these things in the traditional way.
-In compatibility mode, however, long names are not recognised.
-Compatibility mode can be turned on with the
-.B \-C
-command line option, and turned on or off with the
-.B cp
-request.
-The number register
-.B \en[.C]
-is 1 if compatibility mode is on, 0 otherwise.
-.LP
-GNU troff
-does not allow the use of the escape sequences
-.BR \\e\e|\e^\e&\e}\e{\e (space) \e'\e`\e-\e_\e!\e%\ec
-in names of strings, macros, diversions, number registers,
-fonts or environments; UNIX troff does.
-The
-.B \eA
-escape sequence may be helpful in avoiding use of these
-escape sequences in names.
-.LP
-Fractional pointsizes cause one noteworthy incompatibility.
-In UNIX troff the
-.B ps 
-request ignores scale indicators and so
-.IP
-.B .ps\ 10u
-.LP
-will set the pointsize to 10 points, whereas in
-GNU troff it will set the pointsize to 10 scaled points.
-.LP
-In GNU troff there is a fundamental difference between unformatted,
-input characters, and formatted, output characters.
-Everything that affects how an output character
-will be output is stored with the character; once an output
-character has been constructed it is unaffected by any subsequent
-requests that are executed, including
-.BR bd ,
-.BR cs ,
-.BR tkf ,
-.BR tr ,
-or
-.B fp
-requests.
-Normally output characters are constructed from input
-characters at the moment immediately before the character
-is added to the current output line.
-Macros, diversions and strings are all, in fact, the same type
-of object; they contain lists of input characters and output
-characters in any combination.
-An output character does not behave like an input character
-for the purposes of macro processing; it does not inherit any
-of the special properties that the input character from which it
-was constructed might have had.
-For example,
-.IP
-.nf
-.ft B
-\&.di x
-\e\e\e\e
-\&.br
-\&.di
-\&.x
-.ft
-.fi
-.LP
-will print
-.B \e\e
-in GNU troff;
-each pair of input
-.BR \e s
-is turned into one output
-.B \e
-and the resulting output
-.BR \e s
-are not interpreted as escape characters when they are reread.
-UNIX troff would interpret them as escape characters
-when they were reread and would end up printing one
-.BR \e .
-The correct way to obtain a printable
-.B \e
-is to use the
-.B \ee
-escape sequence: this will always print a single instance of the
-current escape character, regardless of whether or not it is used in a
-diversion; it will also work in both GNU troff and UNIX troff.
-If you wish for some reason to store in a diversion an escape
-sequence that will be interpreted when the diversion is reread,
-you can either use the traditional
-.B \e!\&
-transparent output facility, or, if this is unsuitable, the new
-.B \e?\&
-escape sequence.
-.
 .
+.\" --------------------------------------------------------------------
 .SH ENVIRONMENT
-.
+.\" --------------------------------------------------------------------
 .
 .TP
 .SM
 .B GROFF_TMAC_PATH
 A colon separated list of directories in which to search for
 macro files.
-.B troff
+.B @g@troff
 will scan directories given in
 the
 .B \-M
@@ -2495,17 +494,19 @@ unsafe mode, home directory,
 .BR @SYSTEMMACRODIR@ ,
 .BR @MACRODIR@ )
 after these.
+.
 .TP
 .SM
 .B GROFF_TYPESETTER
 Default device.
+.
 .TP
 .SM
 .B GROFF_FONT_PATH
 A colon separated list of directories in which to search for the
 .BI dev name
 directory.
-.B troff
+.B @g@troff
 will scan directories given in the
 .B \-F
 option before these, and in standard directories
@@ -2513,37 +514,42 @@ option before these, and in standard directories
 after these.
 .
 .
+.\" --------------------------------------------------------------------
 .SH FILES
-.
+.\" --------------------------------------------------------------------
 .
 .Tp \w'@FONTDIR@/devname/DESC'u+3n
 .B @MACRODIR@/troffrc
 Initialization file (called before any other macro package).
+.
 .TP
 .B @MACRODIR@/troffrc-end
 Initialization file (called after any other macro package).
+.
 .TP
 .BI @MACRODIR@/ name .tmac
 .TQ
 .BI @MACRODIR@/tmac. name
 Macro files
+.
 .TP
 .BI @FONTDIR@/dev name /DESC
 Device description file for device
 .IR name .
+.
 .TP
 .BI @FONTDIR@/dev name / F
 Font file for font
 .I F
 of device
 .IR name .
-.LP
+.P
 Note that
 .B troffrc
 and
 .B troffrc-end
-are neither searched in the current nor in the home directory by default for
-security reasons (even if the
+are neither searched in the current nor in the home directory by
+default for security reasons (even if the
 .B \-U
 option is given).
 Use the
@@ -2554,28 +560,83 @@ environment variable to add these directories to the search path if
 necessary.
 .
 .
+.\" --------------------------------------------------------------------
+.SH AUTHOR
+.\" --------------------------------------------------------------------
+.
+Copyright (C) 1989, 2001 Free Software Foundation, Inc.
+.
+.P
+This document is distributed under the terms of the FDL (GNU Free
+Documentation License) version 1.1 or later.
+You should have received a copy of the FDL on your system, it is also
+available on-line at the
+.URL "GNU copyleft site" http://www.gnu.org/copyleft/fdl.html .
+This document was written by James Clark, with modifications from
+.URL "Werner Lemberg" mailto:wl@gnu.org
+and
+.URL "Bernd Warken" mailto:bwarken@mayn.de
+.
+.P
+This document is part of
+.IR groff ,
+the GNU roff distribution.
+.
+.\" --------------------------------------------------------------------
 .SH "SEE ALSO"
+.\" --------------------------------------------------------------------
 .
+.TP
+.BR groff (@MAN1EXT@)
+The main program of the
+.I groff
+system, a wrapper around
+.IR @g@troff .
 .
+.TP
 .BR groff (@MAN7EXT@)
--- This is a short but complete reference of all requests, registers, and
-escapes.
-.PP
-.BR groff (@MAN1EXT@),
-.BR @g@tbl (@MAN1EXT@),
-.BR @g@pic (@MAN1EXT@),
-.BR @g@eqn (@MAN1EXT@),
-.BR @g@refer (@MAN1EXT@),
-.BR @g@soelim (@MAN1EXT@),
-.BR @g@grn (@MAN1EXT@),
-.BR grops (@MAN1EXT@),
-.BR grodvi (@MAN1EXT@),
-.BR grotty (@MAN1EXT@),
-.BR grohtml (@MAN1EXT@),
-.BR grolj4 (@MAN1EXT@),
-.BR groff_font (@MAN5EXT@),
-.BR groff_out (@MAN5EXT@),
-.BR groff_char (@MAN7EXT@)
+A description of the
+.I groff
+language, including a short but complete reference of all predefined
+requests, registers, and escapes of plain
+.IR groff .
+From the command line, this is called by
+.RS
+.IP
+.B man 7 groff
+.RE
+.
+.TP
+.BR \%groff_differences (@MAN7EXT@)
+The differences of the
+.I groff
+language and the
+.I classical troff
+language.
+Currently, this is the most actual document of the
+.I groff
+system.
+.
+.TP
+.BR roff (@MAN7EXT@)
+An overview over
+.I groff
+and other
+.I roff
+systems, including pointers to further related documentation.
+.
+.P
+The
+.I groff info
+.IR file ,
+cf.\&
+.BR info (@MAN1EXT@),
+presents all groff documentation within a single document.
+.
+.
+.\" --------------------------------------------------------------------
+.\" Emacs variables
+.\" --------------------------------------------------------------------
 .
 .\" Local Variables:
 .\" mode: nroff
diff --git a/tmac/an-old.tmac b/tmac/an-old.tmac
index a5fa8d77..2fb4693b 100644
--- a/tmac/an-old.tmac
+++ b/tmac/an-old.tmac
@@ -483,6 +483,20 @@
 .  in \\n[an-margin]u
 ..
 .
+.\" table support
+.
+.de1 TS
+.  if n \{\
+.    nr an-pl \\n[.p]
+.    pl \\n[nl]u
+.    bp
+.    pl \\n[an-pl]u
+.  \}
+..
+.
+.de1 TE
+..
+.
 .\" these strings must work in compatibility mode also
 .
 .ds S \s'\\n(PSu'