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Annotation of gforth/termsize.fs, revision 1.1

1.1     ! anton       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