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+.\"***************************************************************************
+.\" Copyright (c) 2011-2013,2015 Free Software Foundation, Inc.              *
+.\"                                                                          *
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+.\"                                                                          *
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+.\"                                                                          *
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+.\"***************************************************************************
+.\"
+.\" $Id: term_variables.3x,v 1.6 2015/04/22 00:34:49 tom Exp $
+.TH term_variables 3X ""
+.ds n 5
+.na
+.hy 0
+.SH NAME
+\fBSP\fP,
+\fBacs_map\fP,
+\fBboolcodes\fP,
+\fBboolfnames\fP,
+\fBboolnames\fP,
+\fBcur_term\fP,
+\fBnumcodes\fP,
+\fBnumfnames\fP,
+\fBnumnames\fP,
+\fBstrcodes\fP,
+\fBstrfnames\fP,
+\fBstrnames\fP,
+\fBttytype\fP
+\- \fBcurses\fR terminfo global variables
+.ad
+.hy
+.SH SYNOPSIS
+.nf
+\fB#include <curses.h>\fR
+.br
+\fB#include <term.h>\fR
+.PP
+\fBchtype acs_map[];\fR
+.sp
+\fBTERMINAL * cur_term;\fR
+.sp
+\fBchar ttytype[];\fR
+.sp
+\fBNCURSES_CONST char * const * boolcodes;\fR
+.br
+\fBNCURSES_CONST char * const * boolfnames;\fR
+.br
+\fBNCURSES_CONST char * const * boolnames;\fR
+.sp
+\fBNCURSES_CONST char * const * numcodes;\fR
+.br
+\fBNCURSES_CONST char * const * numfnames;\fR
+.br
+\fBNCURSES_CONST char * const * numnames;\fR
+.sp
+\fBNCURSES_CONST char * const * strcodes;\fR
+.br
+\fBNCURSES_CONST char * const * strfnames;\fR
+.br
+\fBNCURSES_CONST char * const * strnames;\fR
+.br
+.fi
+.SH DESCRIPTION
+This page summarizes variables provided by the \fBcurses\fP library's
+low-level terminfo interface.
+A more complete description is given in the \fBcurs_terminfo\fP(3X) manual page.
+.PP
+Depending on the configuration, these may be actual variables,
+or macros (see \fBcurs_threads\fR(3X))
+which provide read-only access to \fIcurses\fP's state.
+In either case, applications should treat them as read-only to avoid
+confusing the library.
+.SS Alternate Character Set Mapping
+After initializing the curses or terminfo interfaces,
+the \fBacs_map\fP array holds information used to translate cells
+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_"
+constants in <curses.h>.
+.PP
+The comparable data for the wide-character library is a private variable.
+.SS Current Terminal Data
+After initializing the curses or terminfo interfaces,
+the \fBcur_term\fP contains data describing the current terminal.
+This variable is also set as a side-effect of \fBset_term\fP(3X)
+and \fBdelscreen\fP(3X).
+.PP
+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.
+.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,
+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:
+\fBboolfnames\fP,
+\fBnumfnames\fP, and
+\fBstrfnames\fP.
+.PP
+These are the short names for terminfo capabilities:
+\fBboolnames\fP,
+\fBnumnames\fP, and
+\fBstrnames\fP.
+.PP
+These are the corresponding names used for termcap descriptions:
+\fBboolcodes\fP,
+\fBnumcodes\fP, and
+\fBstrcodes\fP.
+.\"
+.SS Terminal Type
+On initialization of the curses or terminfo interfaces,
+\fBsetupterm\fP copies the terminal name 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 cur_term->type.
+.fi
+.ft R
+.PP
+These symbols provide a faster method of accessing terminfo capabilities
+than using \fBtigetstr\fR(3X), etc.
+.\"
+.SH NOTES
+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,
+since other comparable low-level information is omitted by X/Open).
+.PP
+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(\*n).
+.hy