term_variables(3) Library calls term_variables(3)
NAME
SP, acs_map, boolcodes, boolfnames, boolnames, cur_term, numcodes,
numfnames, numnames, strcodes, strfnames, strnames, ttytype - terminfo
global variables
SYNOPSIS
#include <curses.h>
#include <term.h>
chtype acs_map[];
SCREEN * SP;
TERMINAL * cur_term;
char ttytype[];
NCURSES_CONST char * const boolcodes[];
NCURSES_CONST char * const boolfnames[];
NCURSES_CONST char * const boolnames[];
NCURSES_CONST char * const numcodes[];
NCURSES_CONST char * const numfnames[];
NCURSES_CONST char * const numnames[];
NCURSES_CONST char * const strcodes[];
NCURSES_CONST char * const strfnames[];
NCURSES_CONST char * const strnames[];
DESCRIPTION
This page summarizes variables provided by the curses library's low-
level terminfo interface. A more complete description is given in the
curs_terminfo(3X) manual page.
Depending on the configuration, these may be actual variables, or
macros (see curs_threads(3X)) which provide read-only access to
curses's state. In either case, applications should treat them as
read-only to avoid confusing the library.
Alternate Character Set Mapping
After initializing the curses or terminfo interfaces, the acs_map array
holds information used to translate cells with the A_ALTCHARSET video
attribute into line-drawing characters.
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>.
The comparable data for the wide-character library is a private
variable.
Current Terminal Data
After initializing the curses or terminfo interfaces, the cur_term
contains data describing the current terminal. This variable is also
set as a side-effect of set_term(3X) and delscreen(3X).
It is possible to save a value of cur_term for subsequent use as a
parameter to set_term, for switching between screens. Alternatively,
one can save the return value from newterm or setupterm(3X) to reuse in
set_term.
terminfo Lookup Tables
The tic(1) and infocmp(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.
The long terminfo capability names use a "f" (eff) in their names:
boolfnames, numfnames, and strfnames.
These are the short names for terminfo capabilities: boolnames,
numnames, and strnames.
These are the corresponding names used for termcap descriptions:
boolcodes, numcodes, and strcodes.
Terminal Type
A terminal description begins with one or more terminal names separated
by "|" (vertical bars). On initialization of the curses or terminfo
interfaces, setupterm(3X) copies the terminal names to the array
ttytype.
terminfo Names
In addition to the variables, <term.h> also defines a symbol for each
terminfo capability long name. These are in terms of the symbol CUR,
which is defined
#define CUR ((TERMTYPE *)(cur_term))->
These symbols provide a faster method of accessing terminfo
capabilities than using tigetstr(3X), etc.
The actual definition of CUR depends upon the implementation, but each
terminfo library provides these long names defined to point into the
current terminal description loaded into memory.
NOTES
The low-level terminfo interface is initialized using setupterm(3X).
The upper-level curses interface uses the low-level terminfo interface,
internally.
PORTABILITY
X/Open Curses does not describe any of these except for cur_term. (The
inclusion of cur_term appears to be an oversight, since other
comparable low-level information is omitted by X/Open).
Other implementations may have comparable variables. Some
implementations provide the variables in their libraries, but omit them
from the header files.
All implementations which provide terminfo interfaces add definitions
as described in the Terminfo Names section. Most, but not all, base
the definition upon the cur_term variable.
SEE ALSO
curses(3X), curs_terminfo(3X), curs_threads(3X), terminfo(5)
ncurses 6.5 2024-03-16 term_variables(3)
ncurses 6.5 - Generated Thu May 2 18:45:18 CDT 2024