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term_variables(3X)					    term_variables(3X)

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

       #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[];

       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	 curs-
       es's state.  In either case, applications should	treat them as read-on-
       ly 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	 vari-

   Current Terminal Data
       After initializing the curses or	terminfo interfaces, the cur_term con-
       tains 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 pa-
       rameter to set_term, for	switching between screens.  Alternatively, one
       can  save  the  return  value from newterm or setupterm(3X) to reuse in

   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  applica-
       tions,  although	the hash-tables	used by	the terminfo and termcap func-
       tions 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, num-
       names, and strnames.

       These are the corresponding names used for termcap descriptions:	 bool-
       codes, 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 tty-

   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  capabili-
       ties 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.

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

       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  compara-
       ble low-level information is omitted by X/Open).

       Other  implementations may have comparable variables.  Some implementa-
       tions 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.

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



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