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New "docclean" target for makefile (removes glossary dependencies when
rebuilding documentation). Changes to .fs files and prim are restricted
to glossary (\G) additions for the documentation; this has necessitated
the addition of new white-space in places to stop the \G stuff from
obscuring the code. Many additions to doc/gforth.ds - new sections
added, a few things moved and some sections re-written slightly. There
are a set of things to tidy up before this rev. is suitable for
release, and those will be my highest priority. I have also used
"@comment TODO" to highlight other sections I plan to work on, and
added a set of comments at the start to indicate other things I plan
to modify in the medium-term.

    1: \ miscelleneous words
    2: 
    3: \ Copyright (C) 1996,1997,1998 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: ' require alias needs ( ... "name" -- ... ) \ gforth
   23: \G an alias for @code{require}; exists on other systems (e.g., Win32Forth).
   24: \ needs is an F-PC name. we will probably switch to 'needs' in the future
   25: 
   26: \ a little more compiler security
   27: 
   28: \ currently not used by Gforth, but maybe by add-ons e.g., the 486asm
   29: AUser CSP
   30: 
   31: : !CSP ( -- )
   32:     sp@ csp ! ;
   33: 
   34: : ?CSP ( -- )
   35:     sp@ csp @ <> -22 and throw ;
   36: 
   37: \ DMIN and DMAX
   38: 
   39: : dmin ( d1 d2 -- d ) \ double
   40:     2over 2over d> IF  2swap  THEN 2drop ;
   41: 
   42: : dmax ( d1 d2 -- d ) \ double
   43:     2over 2over d< IF  2swap  THEN 2drop ;
   44: 
   45: \ shell commands
   46: 
   47: 0 Value $? ( -- n ) \ gforth
   48: \G VALUE: The exit status returned by the most recently executed
   49: \G @code{system} command.
   50: 
   51: : system ( addr u -- ) \ gforth
   52: \G Pass the string specified by c-addr, u to the host operating system
   53: \G for execution in a sub-shell.
   54:     (system) throw TO $? ;
   55: 
   56: : sh ( "..." -- ) \ gforth
   57: \G Parse a string and use @code{system} to pass it to the host
   58: \G operating system for execution in a sub-shell.
   59:     '# parse cr system ;
   60: 
   61: \ stuff
   62: 
   63: : ]L ( compilation: n -- ; run-time: -- n )
   64:     \G equivalent to "] literal"
   65:     ] postpone literal ;
   66: 
   67: : in-dictionary? ( x -- f )
   68:     forthstart dictionary-end within ;
   69: 
   70: : in-return-stack? ( addr -- f )
   71:     rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;