term_variables(3x) — Linux manual page


term_variables(3X)                                    term_variables(3X)

NAME         top

       SP, acs_map, boolcodes, boolfnames, boolnames, cur_term,
       numcodes, numfnames, numnames, strcodes, strfnames, strnames,
       ttytype - curses terminfo global variables

SYNOPSIS         top

       #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         top

       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

   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

       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         top

       The low-level terminfo interface is initialized using
       setupterm(3X).  The upper-level curses interface uses the low-
       level terminfo interface, internally.

PORTABILITY         top

       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         top

       curses(3X), curs_terminfo(3X), curs_threads(3X), terminfo(5).

COLOPHON         top

       This page is part of the ncurses (new curses) project.
       Information about the project can be found at 
       ⟨https://www.gnu.org/software/ncurses/ncurses.html⟩.  If you have
       a bug report for this manual page, send it to
       bug-ncurses-request@gnu.org.  This page was obtained from the
       project's upstream Git mirror of the CVS repository
       ⟨https://github.com/mirror/ncurses.git⟩ on 2023-06-23.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-03-12.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to