|
NAME | SYNOPSIS | DESCRIPTION | NOTES | PORTABILITY | SEE ALSO | COLOPHON |
curs_variables(3X) curs_variables(3X)
COLORS, COLOR_PAIRS, COLS, ESCDELAY, LINES, TABSIZE, curscr, newscr,
stdscr - curses global variables
#include <curses.h>
int COLOR_PAIRS;
int COLORS;
int COLS;
int ESCDELAY;
int LINES;
int TABSIZE;
WINDOW * curscr;
WINDOW * newscr;
WINDOW * stdscr;
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) and curs_opaque(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.
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.
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.
curses(3X), curs_opaque(3X), curs_terminfo(3X), curs_threads(3X),
term_variables(3X), terminfo(5).
This page is part of the ncurses (new curses) project. Information
about the project can be found at
⟨https://www.gnu.org/software/ncurses/ncurses.html⟩. If you have a
bug report for this manual page, send it to
bug-ncurses-request@gnu.org. This page was obtained from the
project's upstream Git mirror of the CVS repository
⟨git://ncurses.scripts.mit.edu/ncurses.git⟩ on 2017-07-05. If you
discover any rendering problems in this HTML version of the page, or
you believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
curs_variables(3X)