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1.1       root        1: .\" Copyright (c) 1980 The Regents of the University of California.
                      2: .\" All rights reserved.
                      3: .\"
                      4: .\" Redistribution and use in source and binary forms are permitted
                      5: .\" provided that the above copyright notice and this paragraph are
                      6: .\" duplicated in all such forms and that any documentation,
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                      8: .\" distribution and use acknowledge that the software was developed
                      9: .\" by the University of California, Berkeley.  The name of the
                     10: .\" University may not be used to endorse or promote products derived
                     11: .\" from this software without specific prior written permission.
                     12: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     13: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     14: .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     15: .\"
                     16: .\"    @(#)intro.2     6.2 (Berkeley) 3/17/89
                     17: .\"
                     18: .sh 1 Variables
                     19: .pp
                     20: Many variables which are used to describe the terminal environment
                     21: are available to the programmer. They are:
                     22: .TS
                     23: expand;
                     24: lw(6m) lw(8n) lw(50n).
                     25: type   name    description
                     26: _
                     27: WINDOW *       curscr  T{
                     28: .fi
                     29: current version of the screen (terminal screen).
                     30: T}
                     31: WINDOW *       stdscr  T{
                     32: standard screen.  Most updates are usually done here.
                     33: T}
                     34: char * Def\*_term      T{
                     35: default terminal type if type cannot be determined
                     36: T}
                     37: bool   My\*_term       T{
                     38: use the terminal specification in \fIDef\*_term\fR as terminal,
                     39: irrelevant of real terminal type
                     40: T}
                     41: char * ttytype T{
                     42: full name of the current terminal.
                     43: T}
                     44: int    LINES   T{
                     45: number of lines on the terminal
                     46: T}
                     47: int    COLS    T{
                     48: number of columns on the terminal
                     49: T}
                     50: int    ERR     T{
                     51: error flag returned by routines on a fail.
                     52: T}
                     53: int    OK      T{
                     54: error flag returned by routines when things go right.
                     55: T}
                     56: .TE
                     57: .pp
                     58: There are also several
                     59: .q #define
                     60: constants and types
                     61: which are of general usefulness:
                     62: .sp
                     63: .ev 1
                     64: .ta 11n
                     65: .(b L
                     66: .nf
                     67: reg    storage class ``register'' (\fIe.g.\fP, \fIreg int i;\fR\|)
                     68: bool   boolean type, actually a ``char'' (\fIe.g.\fP, \fIbool doneit;\fR\|)
                     69: TRUE   boolean ``true'' flag (1).
                     70: FALSE  boolean ``false'' flag (0).
                     71: .fi
                     72: .ev
                     73: .)b
                     74: .lp

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