[gforth] / gforth / termsize.fs

gforth: gforth/termsize.fs

1 :	anton	1.1	\ terminal size stuff
2 :
3 :			\ Copyright (C) 1996 Free Software Foundation, Inc.
4 :
5 :			\ This file is part of Gforth.
6 :
7 :			\ Gforth is free software; you can redistribute it and/or
8 :			\ modify it under the terms of the GNU General Public License
9 :			\ as published by the Free Software Foundation; either version 2
10 :			\ of the License, or (at your option) any later version.
11 :
12 :			\ This program is distributed in the hope that it will be useful,
13 :			\ but WITHOUT ANY WARRANTY; without even the implied warranty of
14 :			\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 :			\ GNU General Public License for more details.
16 :
17 :			\ You should have received a copy of the GNU General Public License
18 :			\ along with this program; if not, write to the Free Software
19 :			\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 :
21 :
22 :			\ Currently we get the size from the environment. If the variables
23 :			\ LINES and COLUMNS are not set or wrong, do an "eval `resize`" before
24 :			\ starting Gforth. If you change the window size after starting
25 :			\ Gforth, you are out of luck.
26 :
27 :			\ To do: An implementation that uses termcap and/or ioctl TIOCGWINSZ.
28 :
29 :			\ # rows and columns that the terminal has.
30 :			\ these words are also present in PFE.
31 :			&80 Value cols
32 :			&24 Value rows
33 :
34 :			: getenv-unum ( udefault c-addr ucount -- u )
35 :			getenv over
36 :			IF
37 :			0. 2swap >number 0=
38 :			IF ( udefault d c-addr2 )
39 :			drop drop nip
40 :			ELSE ( udefault djunk c-addr2 )
41 :			drop 2drop
42 :			ENDIF
43 :			ELSE ( udefault c-addr ucount )
44 :			2drop
45 :			ENDIF ;
46 :
47 :			:noname ( -- )
48 :			defers 'cold
49 :			cols s" COLUMNS" getenv-unum TO cols
50 :			rows s" LINES" getenv-unum TO rows ;
51 :			IS 'cold

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