COLORS, COLOR_PAIRS, COLS, ESCDELAY, LINES, TABSIZE, curscr, newscr, stdscr - curses
WINDOW * curscr;
WINDOW * newscr;
WINDOW * stdscr;
This page summarizes variables provided by the curses library. A more complete descrip-
tion is given in the curses(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, ap-
plications should treat them as read-only to avoid confusing the library.
After initializing curses, this variable contains the number of color pairs which the ter-
minal can support. Usually the number of color pairs will be the product COLORS*COLORS,
however this is not always true:
o a few terminals use HLS colors, which do not follow this rule
o terminals supporting a large number of colors are limited by the number of color pairs
that can be represented in a signed short value.
After initializing curses, this variable contains the number of colors which the terminal
After initializing curses, this variable contains the width of the screen, i.e., the num-
ber of columns.
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).
After initializing curses, this variable contains the height of the screen, i.e., the num-
ber of lines.
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
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 termi-
nal screen, is created. Many curses functions use this window.
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.
ESCDELAY and TABSIZE are extensions, not provided in most other implementations of curses.
curses(3X), curs_threads(3X), term_variables(3X), terminfo(3X), terminfo(5).