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276 lines
7.5 KiB
Plaintext
276 lines
7.5 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright 2019-2024,2025 Thomas E. Dickey *
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.\" Copyright 2010-2015,2017 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: term_variables.3x,v 1.44 2025/11/12 01:27:41 tom Exp $
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.TH term_variables 3X 2025-11-11 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
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.ie \n(.g \{\
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.ds `` \(lq
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.ds '' \(rq
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.\}
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.el \{\
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.ie t .ds `` ``
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.el .ds `` ""
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.ie t .ds '' ''
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.el .ds '' ""
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.\}
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.
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.SH NAME
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\fB\%SP\fP,
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\fB\%acs_map\fP,
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\fB\%boolcodes\fP,
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\fB\%boolfnames\fP,
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\fB\%boolnames\fP,
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\fB\%cur_term\fP,
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\fB\%numcodes\fP,
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\fB\%numfnames\fP,
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\fB\%numnames\fP,
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\fB\%strcodes\fP,
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\fB\%strfnames\fP,
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\fB\%strnames\fP,
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\fB\%ttytype\fP \-
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\fIterminfo\fR global variables
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.SH SYNOPSIS
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.nf
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\fB#include <curses.h>
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\fB#include <term.h>
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.PP
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\fBchtype acs_map[];
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.PP
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\fBSCREEN * SP;
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.PP
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\fBTERMINAL * cur_term;
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.PP
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\fBchar ttytype[];
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.PP
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\fBNCURSES_CONST char * const boolcodes[];
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\fBNCURSES_CONST char * const boolfnames[];
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\fBNCURSES_CONST char * const boolnames[];
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.PP
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\fBNCURSES_CONST char * const numcodes[];
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\fBNCURSES_CONST char * const numfnames[];
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\fBNCURSES_CONST char * const numnames[];
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.PP
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\fBNCURSES_CONST char * const strcodes[];
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\fBNCURSES_CONST char * const strfnames[];
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\fBNCURSES_CONST char * const strnames[];
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.fi
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.SH DESCRIPTION
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This page summarizes variables provided by the
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.I curses
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library's lower-level
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.I \%term\%info
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interface.
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Locate a more complete description in the \fBcurs_terminfo\fP(3X) manual
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page.
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.PP
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Depending on
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.IR \%ncurses 's
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build-time configuration,
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these may be actual variables,
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or macros
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(see \fBcurs_threads\fP(3X))
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that provide read-only access to
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.IR curses 's
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state.
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In either case,
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applications should treat them as read-only to avoid confusing the
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library.
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.SS "Alternate Character Set Mapping"
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After initializing the
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.I curses
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or
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.I \%term\%info
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interfaces,
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the
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.B acs_map
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array holds information used to translate cells with the
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.B \%A_ALTCHARSET
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video attribute into line-drawing characters.
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.PP
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The encoding of the information in this array has changed periodically.
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Application developers need only know that it is used for the
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\*(``ACS_\*('' constants in
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.IR \%curses.h "."
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.PP
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The comparable data for the wide-character library are not exposed as
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symbols in the API.
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.SS "Current Terminal Data"
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After initializing the
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.I curses
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or
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.I \%term\%info
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interfaces,
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.B cur_term
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contains data describing the current terminal.
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It is also updated as a side effect of \fBset_term\fP(3X) and
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\fBdelscreen\fP(3X).
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.PP
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It is possible to save a value of
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.B cur_term
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for subsequent use as a parameter to \fBset_term\fP(3X)
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for switching between screens.
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Alternatively,
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one can save the return value from \fBnewterm\fP(3X) or
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\fBsetupterm\fP(3X) to reuse in \fBset_term\fP(3X).
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.SS "\fIterminfo\fP Lookup Tables"
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The \fB@TIC@\fP(1) and \fB@INFOCMP@\fP(1) programs use lookup tables for
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the long and short names of
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.I \%term\%info
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capabilities,
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as well as the corresponding names for
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.I termcap
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capabilities.
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These are available to other applications,
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though the hash tables used by the
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.I \%term\%info
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and
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.I termcap
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functions are not.
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.PP
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.I \%term\%info
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stores capability names in arrays with an \*(``f\*('' (eff) in their
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names:
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.BR \%boolfnames ","
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.BR \%numfnames ","
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and
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.BR \%strfnames "."
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It stores the briefer capability codes in arrays without the
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\*(``f\*('':
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.BR \%boolnames ","
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.BR \%numnames ","
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and
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.BR \%strnames "."
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The corresponding
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.I termcap
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capability codes are stored in
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.BR \%boolcodes ","
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.BR \%numcodes ","
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and
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.BR \%strcodes "."
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\fB\%terminfo\fP(5) catalogs these.
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.\"
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.SS "Terminal Type"
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A terminal description begins with one or more terminal names
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separated by \*(``|\*('' (vertical bars).
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On initialization of the
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.I curses
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or
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.I \%term\%info
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interfaces,
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\fBsetupterm\fP(3X) copies the terminal name to the array
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.BR ttytype "."
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.\"
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.SS "\fIterminfo\fP Names"
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In addition to the variables,
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.I term.h
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also defines a symbol for each
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.I \%term\%info
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capability name.
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These are in terms of the symbol
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.BR CUR ","
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which is defined
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.PP
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.RS
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.EX
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#define CUR ((TERMTYPE *)(cur_term))\->
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.EE
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.RE
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.PP
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These symbols provide a faster method of accessing
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.I \%term\%info
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capabilities than using,
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for example,
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\fBtigetstr\fP(3X).
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.PP
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The definition of
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.B CUR
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is implementation-dependent,
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but each
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.I \%term\%info
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library defines these names to point
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into the in-memory description of the current terminal.
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For example,
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in
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.IR \%ncurses ","
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the expressions
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.B tigetstr("key_dc")
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and
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\*(``\c\" `` string not reliable in a macro call on DWB/Heirloom nroffs
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.B "CUR Strings[59]\c"
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\*('' \" '' string not reliable in a macro call on DWB/Heirloom nroffs
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are equivalent.
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.\"
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.SS "\fIterminfo\fP and \fIcurses"
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\fB\%setupterm\fP(3X) initializes the lower-level
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.I \%term\%info
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interface.
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The higher-level
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.I curses
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interface uses the
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.I \%term\%info
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interface internally;
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the symbol
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.B SP
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bridges the
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.I curses
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.I SCREEN
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type with the
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.I \%term\%info
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.I TERMINAL
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type.
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.\"
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.SH PORTABILITY
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X/Open Curses does not describe any of these symbols except for
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.IR \%cur_term "."
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(The inclusion of
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.I \%cur_term
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appears to be an oversight,
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since other comparable low-level information is omitted by X/Open.)
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.PP
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Other implementations may have comparable variables.
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Some implementations provide the variables in their libraries,
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but omit them from the header files.
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.PP
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All implementations that provide
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.I \%term\%info
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interfaces add definitions
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as described in the
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.RI \*(`` terminfo
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Names\*('' section above.
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Most,
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but not all,
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base the definition upon the
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.I \%cur_term
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variable.
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.SH SEE ALSO
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\fB\%curses\fP(3X),
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\fB\%curs_terminfo\fP(3X),
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\fB\%curs_threads\fP(3X),
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\fB\%terminfo\fP(5)
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