curses_variables
curses_variables
NAMESYNOPSIS
DESCRIPTION
NOTES
PORTABILITY
SEE ALSO
NAME
COLORS, COLOR_PAIRS, COLS, ESCDELAY, LINES, TABSIZE, curscr, newscr, stdscr − curses global variables
SYNOPSIS
#include <ncurses/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.
SEE ALSO
ncurses(3NCURSES), opaque(3NCURSES), terminfo(3NCURSES), threads(3NCURSES), terminfo_variables(3NCURSES), terminfo(5).
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