202 lines
5.2 KiB
Brainfuck
202 lines
5.2 KiB
Brainfuck
.\" Copyright (c) 1980, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)appen.B 8.1 (Berkeley) 6/8/93
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.\"
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.ie t .oh '\*(Ln Appendix B''PS1:19-%'
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.eh 'PS1:19-%''\*(Ln Appendix B'
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.el .he ''\fIAppendix B\fR''
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.bp
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.(x
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.ti 0
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.b "Appendix B"
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.)x
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.nr $1 0
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.sh 1 "The WINDOW structure"
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.pp
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The WINDOW structure is defined as follows:
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.(l I
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.so win_st.gr
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.)l
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.pp
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.Vn \*_cury \\*
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.(f
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\**
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All variables not normally accessed directly by the user
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are named with an initial
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.Bq \*_
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to avoid conflicts with the user's variables.
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.)f
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and
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.Vn \*_curx
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are the current \*y for the window.
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New characters added to the screen
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are added at this point.
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.Vn \*_maxy
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and
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.Vn \*_maxx
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are the maximum values allowed for
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.Vn \*_cury\*,\*_curx ). (
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.Vn \*_begy
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and
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.Vn \*_begx
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are the starting \*y on the terminal for the window,
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.i i.e. ,
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the window's home.
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.Vn \*_cury ,
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.Vn \*_curx ,
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.Vn \*_maxy ,
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and
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.Vn \*_maxx
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are measured relative to
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.Vn \*_begy\*,\*_begx ), (
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not the terminal's home.
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.pp
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.Vn \*_clear
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tells if a clear-screen sequence is to be generated
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on the next
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.Fn refresh
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call.
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This is only meaningful for screens.
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The initial clear-screen for the first
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.Fn refresh
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call is generated by initially setting clear to be TRUE for
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.Vn curscr ,
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which always generates a clear-screen if set,
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irrelevant of the dimensions of the window involved.
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.Vn \*_leave
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is TRUE if the current \*y and the cursor
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are to be left after the last character changed on the terminal,
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or not moved if there is no change.
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.Vn \*_scroll
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is TRUE
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if scrolling is allowed.
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.pp
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.Vn \*_y
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is a pointer to an array of lines which describe the terminal.
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Thus:
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.(l
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\*_y[i]
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.)l
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.lp
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is a pointer to the
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.Vn i th
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line, and
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.(l
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\*_y[i][j]
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.)l
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.lp
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is the
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.Vn j th
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character on the
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.Vn i th
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line.
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.Vn \*_flags
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can have one or more values
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or'd into it.
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.pp
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For windows that are not subwindows,
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.Vn \*_orig
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is
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NULL .
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For subwindows,
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it points to the main window
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to which the window is subsidiary.
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.Vn \*_nextp
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is a pointer in a circularly linked list
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of all the windows which are subwindows of the same main window,
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plus the main window itself.
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.pp
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.Vn \*_firstch
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and
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.Vn \*_lastch
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are
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.Fn malloc ed
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arrays which contain the index of the
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first and last changed characters
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on the line.
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.Vn \*_ch\*_off
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is the x offset for the window
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in the
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.Vn \*_firstch
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and
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.Vn \*_lastch
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arrays for this window.
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For main windows,
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this is always 0;
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for subwindows
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it is the difference between the starting point of the main window
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and that of the subindow,
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so that change markers can be set relative to the main window.
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This makes these markers global in scope.
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.pp
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All subwindows share the appropriate portions of
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.Vn _y ,
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.Vn _firstch ,
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.Vn _lastch ,
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and
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.Vn _insdel
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with their main window.
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.pp
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.b \*_ENDLINE
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says that the end of the line for this window
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is also the end of a screen.
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.b \*_FULLWIN
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says that this window is a screen.
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.b \*_SCROLLWIN
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indicates that the last character of this screen
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is at the lower right-hand corner of the terminal;
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.i i.e. ,
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if a character was put there,
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the terminal would scroll.
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.b \*_FULLLINE
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says that the width of a line is the same as the width of the terminal.
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If
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.b \*_FLUSH
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is set,
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it says that
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.Fn fflush "" "" stdout
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should be called at the end of each
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.Fn refresh
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.b \*_STANDOUT
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says that all characters added to the screen
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are in standout mode.
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.b \*_INSDEL
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is reserved for future use,
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and is set by
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.Fn idlok .
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.Vn \*_firstch
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is set to
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.b \*_NOCHANGE
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for lines on which there has been no change
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since the last
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.Fn refresh .
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