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29 .\" $Id: curs_variables.3x,v 1.8 2015/08/22 23:33:22 tom Exp $
30 .TH curs_variables 3X ""
31 .de bP
32 .IP \(bu 4
33 ..
34 .ds n 5
35 .na
36 .hy 0
37 .SH NAME
38 \fBCOLORS\fR,
39 \fBCOLOR_PAIRS\fR,
40 \fBCOLS\fR,
41 \fBESCDELAY\fR,
42 \fBLINES\fR,
43 \fBTABSIZE\fR,
44 \fBcurscr\fR,
45 \fBnewscr\fR,
46 \fBstdscr\fR
47 \- \fBcurses\fR global variables
48 .ad
49 .hy
50 .SH SYNOPSIS
51 .nf
52 \fB#include <curses.h>\fR
53 .PP
54 \fBint COLOR_PAIRS;\fR
55 .br
56 \fBint COLORS;\fR
57 .br
58 \fBint COLS;\fR
59 .br
60 \fBint ESCDELAY;\fR
61 .br
62 \fBint LINES;\fR
63 .br
64 \fBint TABSIZE;\fR
65 .br
66 \fBWINDOW * curscr;\fR
67 .br
68 \fBWINDOW * newscr;\fR
69 .br
70 \fBWINDOW * stdscr;\fR
71 .fi
72 .SH DESCRIPTION
73 This page summarizes variables provided by the \fBcurses\fP library.
74 A more complete description is given in the \fBcurses\fP(3X) manual page.
75 .PP
76 Depending on the configuration, these may be actual variables,
77 or macros (see \fBcurs_threads\fR(3X) and \fBcurs_opaque\fR(3X))
78 which provide read-only access to \fIcurses\fP's state.
79 In either case, applications should treat them as read-only to avoid
80 confusing the library.
81 .SS COLOR_PAIRS
82 After initializing curses, this variable contains the number of color pairs
83 which the terminal can support.
84 Usually the number of color pairs will be the product \fBCOLORS\fP*\fBCOLORS\fP,
85 however this is not always true:
86 .bP
87 a few terminals use HLS colors, which do not follow this rule
88 .bP
89 terminals supporting a large number of colors are limited by the number
90 of color pairs that can be represented in a \fIsigned short\fP value.
91 .SS COLORS
92 After initializing curses, this variable contains the number of colors
93 which the terminal can support.
94 .SS COLS
95 After initializing curses, this variable contains the width of the screen,
96 i.e., the number of columns.
97 .SS ESCDELAY
98 This variable holds the number of milliseconds to wait after reading an
99 escape character,
100 to distinguish between an individual escape character entered on the
101 keyboard from escape sequences sent by cursor- and function-keys
102 (see curses(3X).
103 .SS LINES
104 After initializing curses, this variable contains the height of the screen,
105 i.e., the number of lines.
106 .SS TABSIZE
107 This variable holds the number of columns used by the \fIcurses\fP library
108 when converting a tab character to spaces as it adds the tab to a window
109 (see curs_addch(3X).
110 .SS The Current Screen
111 This implementation of curses uses a special window \fBcurscr\fP to
112 record its updates to the terminal screen.
113 .SS The New Screen
114 This implementation of curses uses a special window \fBnewscr\fP to
115 hold updates to the terminal screen before applying them to \fBcurscr\fP.
116 .SS The Standard Screen
117 Upon initializing curses,
118 a default window called \fBstdscr\fP,
119 which is the size of the terminal screen, is created.
120 Many curses functions use this window.
121 .SH NOTES
122 The curses library is initialized using either \fBinitscr\fR(3X),
123 or \fBnewterm\fR(3X).
124 .PP
125 If \fBcurses\fP is configured to use separate curses/terminfo libraries,
126 most of these variables reside in the curses library.
127 .SH PORTABILITY
128 ESCDELAY and TABSIZE are extensions,
129 not provided in most other implementations of curses.
130 .PP
131 ESCDELAY is an extension in AIX curses:
132 .bP
133 In AIX, the units for ESCDELAY are \fIfifths\fP of a millisecond.
134 .bP
135 The default value for AIX's ESCDELAY is 0.1 seconds.
136 .bP
137 AIX also enforces a limit of 10,000 seconds for ESCDELAY;
138 this implementation currently has no upper limit.
139 .PP
140 This implementation has long used ESCDELAY with units of milliseconds,
141 making it impossible to be completely compatible with AIX.
142 Likewise, most users have either decided to override the value,
143 or rely upon its default value.
144 .SH SEE ALSO
145 \fBcurses\fR(3X),
146 \fBcurs_opaque\fR(3X),
147 \fBcurs_terminfo\fR(3X),
148 \fBcurs_threads\fR(3X),
149 \fBterm_variables\fR(3X),
150 \fBterminfo\fR(\*n).