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curs_variables

Section: Miscellaneous Library Functions (3X)
Updated:
Index Return to Main Contents
 

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 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.  

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

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
COLOR_PAIRS
COLORS
COLS
ESCDELAY
LINES
TABSIZE
The Current Screen
The New Screen
The Standard Screen
NOTES
PORTABILITY
SEE ALSO


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