X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=man%2Ftabs.1;h=2a127f339119288b4537c778c89b5e13eeeb8c7d;hp=5cb0e3fa555039c3d17ad1a88562127678dc4ba6;hb=6b4f5830b7910188b532d661f79775306715f67e;hpb=5461fc336d03fbfea6b85ac21c6d49c528f6752d

diff --git a/man/tabs.1 b/man/tabs.1
index 5cb0e3fa..2a127f33 100644
--- a/man/tabs.1
+++ b/man/tabs.1
@@ -1,5 +1,5 @@
 .\"***************************************************************************
-.\" Copyright (c) 2008-2013,2016 Free Software Foundation, Inc.              *
+.\" Copyright (c) 2008-2018,2019 Free Software Foundation, Inc.              *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
@@ -26,7 +26,7 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: tabs.1,v 1.15 2016/12/31 16:07:39 tom Exp $
+.\" $Id: tabs.1,v 1.20 2019/02/16 23:56:38 tom Exp $
 .TH @TABS@ 1 ""
 .ds n 5
 .ie \n(.g .ds `` \(lq
@@ -34,12 +34,13 @@
 .ie \n(.g .ds '' \(rq
 .el       .ds '' ''
 .de bP
-.IP \(bu 4
+.ie n  .IP \(bu 4
+.el    .IP \(bu 2
 ..
 .de NS
-.ie \n(.sp
+.ie n  .sp
 .el    .sp .5
-.ie \n(.in +4
+.ie n  .in +4
 .el    .in +2
 .nf
 .ft C			\" Courier
@@ -47,7 +48,8 @@
 .de NE
 .fi
 .ft R
-.in -4
+.ie n  .in -4
+.el    .in -2
 ..
 .SH NAME
 \fB@TABS@\fR \- set tabs on a terminal
@@ -67,6 +69,13 @@ Like \fB@CLEAR@\fR(1), \fB@TABS@\fR writes to the standard output.
 You can redirect the standard output to a file (which prevents
 \fB@TABS@\fR from actually changing the tabstops),
 and later \fBcat\fP the file to the screen, setting tabstops at that point.
+.PP
+These are hardware tabs, which cannot be queried rapidly by applications
+running in the terminal, if at all.
+Curses and other full-screen applications may use hardware tabs
+in optimizing their output to the terminal.
+If the hardware tabstops differ from the information in the terminal
+database, the result is unpredictable.
 .SH OPTIONS
 .SS General Options
 .TP 5
@@ -92,9 +101,10 @@ The \fB@TABS@\fP program processes a single list of tab stops.
 The last option to be processed which defines a list is the one that
 determines the list to be processed.
 .SS Implicit Lists
-Use a single number as an option, e.g., \*(``\fB\-5\fP\*('' to set tabs at the given
-interval (in this case 1, 6, 11, 16, 21, etc.).  Tabs are repeated up to
-the right margin of the screen.
+Use a single number as an option,
+e.g., \*(``\fB\-5\fP\*('' to set tabs at the given
+interval (in this case 1, 6, 11, 16, 21, etc.).
+Tabs are repeated up to the right margin of the screen.
 .PP
 Use \*(``\fB\-0\fP\*('' to clear all tabs.
 .PP
@@ -111,7 +121,8 @@ tabs 1,6,11,16,21
 tabs 1 6 11 16 21
 .NE
 .PP
-Use a \*(``+\*('' to treat a number as an increment relative to the previous value,
+Use a \*(``+\*('' to treat a number
+as an increment relative to the previous value,
 e.g.,
 .NS
 tabs 1,+5,+5,+5,+5
@@ -149,8 +160,9 @@ SNOBOL
 UNIVAC 1100 Assembler
 .SH PORTABILITY
 .PP
-IEEE Std 1003.1/The Open Group  Base Specifications Issue 7 (POSIX.1-2008) describes
-a \fBtabs\fP utility.  However
+\fIIEEE Std 1003.1/The Open Group Base Specifications Issue 7\fP (POSIX.1-2008)
+describes a \fBtabs\fP utility.
+However
 .bP
 This standard describes a \fB+m\fP option, to set a terminal's left-margin.
 Very few of the entries in the terminal database provide this capability.
@@ -162,7 +174,8 @@ The \fB\-d\fP (debug) and \fB\-n\fP (no-op) options are extensions not provided
 by other implementations.
 .PP
 Documentation for other implementations states that there is a limit on the
-number of tab stops.  While some terminals may not accept an arbitrary number
+number of tab stops.
+While some terminals may not accept an arbitrary number
 of tab stops, this implementation will attempt to set tab stops up to the
 right margin of the screen, if the given list happens to be that long.
 .SH SEE ALSO