term_variables
Section: Miscellaneous Library Functions (3X)
Updated:
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NAME
SP,
acs_map,
boolcodes,
boolfnames,
boolnames,
cur_term,
numcodes,
numfnames,
numnames,
strcodes,
strfnames,
strnames,
ttytype
-
curses terminfo global variables
SYNOPSIS
#include <curses.h>
#include <term.h>
chtype acs_map[];
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 to reuse in set_term.
Terminfo Names
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 "l" (ell) 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
On initialization of the curses or terminfo interfaces,
setupterm copies the terminal name 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 cur_term->type.
These symbols provide a faster method of accessing terminfo capabilities
than using tigetstr(3X), etc.
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).
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- Alternate Character Set Mapping
-
- Current Terminal Data
-
- Terminfo Names
-
- Terminal Type
-
- Terminfo Names
-
- NOTES
-
- PORTABILITY
-
- SEE ALSO
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