stdscr(3ncurses)

NAME

   COLORS, COLOR_PAIRS, COLS, ESCDELAY, LINES, TABSIZE, curscr, newscr,
   stdscr - curses global variables

SYNOPSIS

   #include <curses.h>

   int COLOR_PAIRS;
   int COLORS;
   int COLS;
   int ESCDELAY;
   int LINES;
   int TABSIZE;
   WINDOW * curscr;
   WINDOW * newscr;
   WINDOW * stdscr;

DESCRIPTION

   This page summarizes variables provided by the curses library.  A  more
   complete description is given in the curses(3X) manual page.

   Depending  on  the  configuration,  these  may  be actual variables, or
   macros (see threads(3NCURSES) and opaque(3NCURSES)) which provide read-
   only  access  to  curses's  state.  In either case, applications should
   treat them as read-only to avoid confusing the library.

   COLOR_PAIRS
   After initializing curses, this variable contains the number  of  color
   pairs  which  the  terminal  can  support.  Usually the number of color
   pairs will be the product COLORS*COLORS, however  this  is  not  always
   true:

   ·   a few terminals use HLS colors, which do not follow this rule

   ·   terminals  supporting  a  large number of colors are limited by the
       number of color pairs that can be represented  in  a  signed  short
       value.

   COLORS
   After  initializing curses, this variable contains the number of colors
   which the terminal can support.

   COLS
   After initializing curses, this variable  contains  the  width  of  the
   screen, i.e., the number of columns.

   ESCDELAY
   This variable holds the number of milliseconds to wait after reading an
   escape character, to distinguish between an individual escape character
   entered  on  the  keyboard  from  escape  sequences sent by cursor- and
   function-keys (see curses(3X).

   LINES
   After initializing curses, this variable contains  the  height  of  the
   screen, i.e., the number of lines.

   TABSIZE
   This  variable  holds  the number of columns used by the curses library
   when converting a tab character to spaces as  it  adds  the  tab  to  a
   window (see curs_addch(3X).

   The Current Screen
   This  implementation  of  curses uses a special window curscr to record
   its updates to the terminal screen.

   The New Screen
   This implementation of curses uses a  special  window  newscr  to  hold
   updates to the terminal screen before applying them to curscr.

   The Standard Screen
   Upon  initializing curses, a default window called stdscr, which is the
   size of the terminal screen, is created.   Many  curses  functions  use
   this window.

NOTES

   The   curses  library  is  initialized  using  either  initscr(3X),  or
   newterm(3X).

   If curses is configured to use separate curses/terminfo libraries, most
   of these variables reside in the curses library.

PORTABILITY

   ESCDELAY  and  TABSIZE  are  extensions,  not  provided  in  most other
   implementations of curses.

   ESCDELAY is an extension in AIX curses:

   ·   In AIX, the units for ESCDELAY are fifths of a millisecond.

   ·   The default value for AIX's ESCDELAY is 0.1 seconds.

   ·   AIX also enforces a limit of  10,000  seconds  for  ESCDELAY;  this
       implementation currently has no upper limit.

   This  implementation has long used ESCDELAY with units of milliseconds,
   making it impossible to be completely compatible with  AIX.   Likewise,
   most  users have either decided to override the value, or rely upon its
   default value.

SEE ALSO

   ncurses(3NCURSES),        opaque(3NCURSES),         terminfo(3NCURSES),
   threads(3NCURSES), terminfo_variables(3NCURSES), terminfo(5).

                                                curses_variables(3NCURSES)

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