Annotation of gforth/stuff.fs, revision 1.18
1.1 anton 1: \ miscelleneous words
2:
1.15 anton 3: \ Copyright (C) 1996,1997,1998,2000 Free Software Foundation, Inc.
1.1 anton 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
1.16 anton 19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 anton 20:
1.17 anton 21: require glocals.fs
1.8 anton 22:
1.6 anton 23: ' require alias needs ( ... "name" -- ... ) \ gforth
1.11 crook 24: \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
1.1 anton 25: \ needs is an F-PC name. we will probably switch to 'needs' in the future
26:
27: \ a little more compiler security
28:
29: \ currently not used by Gforth, but maybe by add-ons e.g., the 486asm
30: AUser CSP
31:
32: : !CSP ( -- )
33: sp@ csp ! ;
34:
35: : ?CSP ( -- )
36: sp@ csp @ <> -22 and throw ;
1.2 anton 37:
1.4 anton 38: \ DMIN and DMAX
39:
1.13 crook 40: : dmin ( d1 d2 -- d ) \ double d-min
1.5 pazsan 41: 2over 2over d> IF 2swap THEN 2drop ;
1.2 anton 42:
1.13 crook 43:
44: : dmax ( d1 d2 -- d ) \ double d-max
1.5 pazsan 45: 2over 2over d< IF 2swap THEN 2drop ;
1.4 anton 46:
47: \ shell commands
48:
1.10 crook 49: 0 Value $? ( -- n ) \ gforth dollar-question
1.12 crook 50: \G @code{Value} -- the exit status returned by the most recently executed
1.9 crook 51: \G @code{system} command.
1.4 anton 52:
1.14 anton 53: : system ( c-addr u -- ) \ gforth
54: \G Pass the string specified by @var{c-addr u} to the host operating system
1.9 crook 55: \G for execution in a sub-shell.
1.4 anton 56: (system) throw TO $? ;
1.9 crook 57:
1.4 anton 58: : sh ( "..." -- ) \ gforth
1.9 crook 59: \G Parse a string and use @code{system} to pass it to the host
60: \G operating system for execution in a sub-shell.
1.4 anton 61: '# parse cr system ;
62:
1.8 anton 63: \ stuff
64:
1.10 crook 65: : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
66: \G equivalent to @code{] literal}
1.8 anton 67: ] postpone literal ;
68:
69: : in-dictionary? ( x -- f )
70: forthstart dictionary-end within ;
71:
72: : in-return-stack? ( addr -- f )
73: rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;
1.17 anton 74:
75: \ const-does>
76:
77: : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
1.18 ! anton 78: \ compile u literals, starting with the bottommost one
1.17 anton 79: ?dup-if
80: swap >r 1- compile-literals
81: r> POSTPONE literal
82: endif ;
83:
84: : compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive
1.18 ! anton 85: \ compile u fliterals, starting with the bottommost one
1.17 anton 86: ?dup-if
87: { F: r } 1- compile-fliterals
88: r POSTPONE fliteral
89: endif ;
90:
91: : (const-does>) ( w*uw r*ur uw ur target "name" -- )
1.18 ! anton 92: \ define a colon definition "name" containing w*uw r*ur as
! 93: \ literals and a call to target.
1.17 anton 94: { uw ur target }
95: header docol: cfa, \ start colon def without stack junk
96: ur compile-fliterals uw compile-literals
97: target compile, POSTPONE exit reveal ;
98:
99: : const-does> ( run-time: w*uw r*ur uw ur "name" -- )
1.18 ! anton 100: \G Defines @var{name} and returns.@sp 0
! 101: \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the
! 102: \G code following the @code{const-does>}.
1.17 anton 103: here >r 0 POSTPONE literal
104: POSTPONE (const-does>)
105: POSTPONE ;
106: noname : POSTPONE rdrop
107: lastxt r> cell+ ! \ patch the literal
108: ; immediate
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