.\"***************************************************************************
-.\" Copyright (c) 2010,2011 Free Software Foundation, Inc. *
+.\" Copyright 2019,2020 Thomas E. Dickey *
+.\" Copyright 2010-2015,2017 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: term_variables.3x,v 1.3 2011/12/17 23:31:50 tom Exp $
+.\" $Id: term_variables.3x,v 1.12 2020/02/02 23:34:34 tom Exp $
.TH term_variables 3X ""
.ds n 5
+.ie \n(.g .ds `` \(lq
+.el .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el .ds '' ''
.na
.hy 0
.SH NAME
\fB#include <term.h>\fR
.PP
\fBchtype acs_map[];\fR
-.br
-\fBNCURSES_CONST char * const * boolcodes;\fR
-.br
-\fBNCURSES_CONST char * const * boolfnames;\fR
-.br
-\fBNCURSES_CONST char * const * boolnames;\fR
-.br
+.sp
+\fBSCREEN * SP;\fR
+.sp
\fBTERMINAL * cur_term;\fR
+.sp
+\fBchar ttytype[];\fR
+.sp
+\fBNCURSES_CONST char * const boolcodes[];\fR
.br
-\fBNCURSES_CONST char * const * numcodes;\fR
-.br
-\fBNCURSES_CONST char * const * numfnames;\fR
+\fBNCURSES_CONST char * const boolfnames[];\fR
.br
-\fBNCURSES_CONST char * const * numnames;\fR
+\fBNCURSES_CONST char * const boolnames[];\fR
+.sp
+\fBNCURSES_CONST char * const numcodes[];\fR
.br
-\fBNCURSES_CONST char * const * strcodes;\fR
+\fBNCURSES_CONST char * const numfnames[];\fR
.br
-\fBNCURSES_CONST char * const * strfnames;\fR
+\fBNCURSES_CONST char * const numnames[];\fR
+.sp
+\fBNCURSES_CONST char * const strcodes[];\fR
.br
-\fBNCURSES_CONST char * const * strnames;\fR
+\fBNCURSES_CONST char * const strfnames[];\fR
.br
-\fBchar ttytype[];\fR
+\fBNCURSES_CONST char * const strnames[];\fR
.br
.fi
.SH DESCRIPTION
with the \fBA_ALTCHARSET\fP video attribute into line-drawing characters.
.PP
The encoding of the information in this array has changed periodically.
-Application developers need only know that it is used for the "ACS_"
+Application developers need only know that it is used for the \*(``ACS_\*(''
constants in <curses.h>.
.PP
The comparable data for the wide-character library is a private variable.
It is possible to save a value of \fBcur_term\fP for subsequent
use as a parameter to \fBset_term\fP, for switching between screens.
Alternatively, one can save the return value from \fBnewterm\fP
-or \fBsetupterm\fP to reuse in \fBset_term\fP.
+or \fBsetupterm\fP(3X) to reuse in \fBset_term\fP.
.SS Terminfo Names
The \fB@TIC@\fP(1) and \fB@INFOCMP@\fP(1) programs use lookup tables for
the long and short names of terminfo capabilities,
as well as the corresponding names for termcap capabilities.
These are available to other applications,
-though the hash-tables are not available.
+although the hash-tables used by
+the terminfo and termcap functions are not available.
.PP
-The long terminfo capability names use a "l" (ell) in their names:
-boolfnames
-numfnames
-strfnames
+The long terminfo capability names use a \*(``l\*('' (ell) in their names:
+\fBboolfnames\fP,
+\fBnumfnames\fP, and
+\fBstrfnames\fP.
.PP
These are the short names for terminfo capabilities:
-boolnames,
-numnames, and
-strnames.
+\fBboolnames\fP,
+\fBnumnames\fP, and
+\fBstrnames\fP.
.PP
These are the corresponding names used for termcap descriptions:
-boolcodes,
-numcodes, and
-strcodes.
+\fBboolcodes\fP,
+\fBnumcodes\fP, and
+\fBstrcodes\fP.
+.\"
.SS Terminal Type
+A terminal description begins with one or more terminal names
+separated by \*(``|\*('' (vertical bars).
On initialization of the curses or terminfo interfaces,
-\fBsetupterm\fP copies the terminal name to the array \fBttytype\fP.
+\fBsetupterm\fP(3X) copies the terminal names to the array \fBttytype\fP.
+.\"
+.SS Terminfo Names
+.PP
+In addition to the variables, \fB<term.h>\fP also defines a symbol for each
+terminfo capability \fIlong name\fP.
+These are in terms of the symbol \fBCUR\fP,
+which is defined
+.PP
+.nf
+.ft CW
+#define CUR ((TERMTYPE *)(cur_term))->
+.fi
+.ft R
+.PP
+These symbols provide a faster method of accessing terminfo capabilities
+than using \fBtigetstr\fR(3X), etc.
+.PP
+The actual definition of \fBCUR\fP depends upon the implementation,
+but each terminfo library provides these long names defined to point
+into the current terminal description loaded into memory.
+.\"
.SH NOTES
-The low-level terminfo interface is initialized using \fBsetupterm\fR(3X).
+The low-level terminfo interface is initialized using
+.hy 0
+\fBsetupterm\fR(3X).
+.hy
The upper-level curses interface uses the low-level terminfo interface,
internally.
+.\"
.SH PORTABILITY
X/Open Curses does not describe any of these except for \fBcur_term\fP.
(The inclusion of \fBcur_term\fP appears to be an oversight,
Other implementations may have comparable variables.
Some implementations provide the variables in their libraries,
but omit them from the header files.
+.PP
+All implementations which provide terminfo interfaces add definitions
+as described in the \fBTerminfo Names\fP section.
+Most, but not all, base the definition upon the \fBcur_term\fP variable.
.SH SEE ALSO
+.hy 0
\fBcurses\fR(3X),
\fBcurs_terminfo\fR(3X),
\fBcurs_threads\fR(3X),
-\fBterminfo\fR(3X),
\fBterminfo\fR(\*n).
+.hy
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