.\"***************************************************************************
-.\" Copyright (c) 2017 Free Software Foundation, Inc. *
+.\" Copyright (c) 2017-2018,2019 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 *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: user_caps.5,v 1.2 2017/09/04 19:27:24 tom Exp $
+.\" $Id: user_caps.5,v 1.10 2019/05/18 22:48:40 tom Exp $
.TH user_caps 5
.ie \n(.g .ds `` \(lq
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.de NS
-.ie \n(.sp
+.ie n .sp
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-.ie \n(.in +4
+.ie n .in +4
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+.ie n .in -4
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.de bP
-.IP \(bu 4
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.SH NAME
user_caps \- user-defined terminfo capabilities
.SH SYNOPSIS
-.B tic -x, infocmp -x
+.B @TIC@ -x, @INFOCMP@ -x
.SH DESCRIPTION
.SS Background
.PP
While ncurses' repertoire of predefined capabilities is closest to Solaris,
Solaris's terminfo database has a few differences from
the list published by X/Open Curses.
+For example, ncurses can be configured with tables which match the
+terminal databases for AIX, HP-UX or OSF/1,
+rather than the default Solaris-like configuration.
+.bP
+In SVr4 curses and ncurses,
+the terminal database is defined at compile-time using a text file
+which lists the different terminal capabilities.
+.IP
+In principle, the text-file can be extended,
+but doing this requires recompiling and reinstalling the library.
+The text-file used in ncurses for terminal capabilities includes
+details for various systems past the documented X/Open Curses features.
+For example, ncurses supports these capabilities in each configuration:
+.RS 8
+.TP 5
+memory_lock
+(meml)
+lock memory above cursor
+.TP 5
+memory_unlock
+(memu)
+unlock memory
+.TP 5
+box_chars_1
+(box1)
+box characters primary set
+.RE
+.IP
+The memory lock/unlock capabilities were included because they were used
+in the X11R6 terminal description for \fBxterm\fP.
+The \fIbox1\fP capability is used in @TIC@ to help with terminal descriptions
+written for AIX.
.PP
During the 1990s, some users were reluctant to use terminfo
in spite of its performance advantages over termcap:
These are referred to as \fIuser-defined capabilities\fP because no
modifications to the toolset's predefined capability names are needed.
.PP
-The ncurses utilities \fBtic\fP and \fBinfocmp\fP have a command-line
+The ncurses utilities \fB@TIC@\fP and \fB@INFOCMP@\fP have a command-line
option \*(``\-x\*('' to control whether the nonstandard capabilities
-are stored or retrieved. A library function \fBuse_extended_names\fP
+are stored or retrieved.
+A library function \fBuse_extended_names\fP
is provided for the same purpose.
.PP
When compiling a terminal database, if \*(``\-x\*('' is set,
-\fBtic\fP will store a user-defined capability if the capability name is not
+\fB@TIC@\fP will store a user-defined capability if the capability name is not
one of the predefined names.
.PP
Because ncurses provides a termcap library interface,
.TP 3
AX
\fIboolean\fP, asserts that the terminal interprets SGR 39 and SGR 49
-by resetting the foreground and background color, respectively, to the default.
+by resetting the foreground and background color, respectively, to the default.
.IP
This is a feature recognized by the \fBscreen\fP program as well.
.TP 3
RGB
\fIboolean\fP, \fInumber\fP \fBor\fP \fIstring\fP,
to assert that the
-\fBset_a_foreground\fP and
+\fBset_a_foreground\fP and
\fBset_a_background\fP capabilities correspond to \fIdirect colors\fP,
-using an RGB (red/green/blue) convention.
+using an RGB (red/green/blue) convention.
This capability allows the \fBcolor_content\fP function to
return appropriate values without requiring the application
to initialize colors using \fBinit_color\fP.
explicitly list the number of bits used for red, green and blue components
as a slash-separated list of decimal integers.
.RE
+.IP
+Because there are several RGB encodings in use,
+applications which make assumptions about the number of bits per color
+are unlikely to work reliably.
+As a trivial case, for example, one could define \fBRGB#1\fP
+to represent the standard eight ANSI colors, i.e., one bit per color.
.TP 3
U8
-\fIboolean\fP,
+\fInumber\fP,
asserts that ncurses must use Unicode values for line-drawing characters,
and that it should ignore the alternate character set capabilities
when the locale uses UTF-8 encoding.
kHOM/special form of khome (Home)
kLFT/special form of kcub1 (cursor-left or cursor-back)
kNXT/special form of knext (Next, or Page-Down)
-kPRV/special form of kprev (Prev, or Page-Up)
+kPRV/special form of kprev (Prev, or Page-Up)
kRIT/special form of kcuf1 (cursor-right, or cursor-forward)
kUP/special form of kcuu1 (cursor-up)
.TE
.PP
.SH PORTABILITY
.PP
-The \*(``\-x\*('' extension feature of \fBtic\fP and \fBinfocmp\fP
+The \*(``\-x\*('' extension feature of \fB@TIC@\fP and \fB@INFOCMP@\fP
has been adopted in NetBSD curses.
That implementation stores user-defined capabilities,
but makes no use of these capabilities itself.
.SH SEE ALSO
.PP
-\fBtic\fR(1),
-\fBinfocmp\fR(1).
+\fB@TIC@\fR(1M),
+\fB@INFOCMP@\fR(1M).
.SH AUTHORS
.PP
Thomas E. Dickey
projects / ncurses.git / blobdiff