[gforth] / gforth / stuff.fs  

gforth: gforth/stuff.fs

1 : anton 1.1 \ miscelleneous words
2 :    
3 : anton 1.15 \ Copyright (C) 1996,1997,1998,2000 Free Software Foundation, Inc.
4 : anton 1.1
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 : anton 1.16 \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20 : anton 1.1
21 : anton 1.17 require glocals.fs
22 : anton 1.8
23 : anton 1.6 ' require alias needs ( ... "name" -- ... ) \ gforth
24 : crook 1.11 \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
25 : anton 1.1 \ 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 ;
37 : anton 1.2
38 : anton 1.4 \ DMIN and DMAX
39 :    
40 : crook 1.13 : dmin ( d1 d2 -- d ) \ double d-min
41 : pazsan 1.5 2over 2over d> IF 2swap THEN 2drop ;
42 : anton 1.2
43 : crook 1.13
44 :     : dmax ( d1 d2 -- d ) \ double d-max
45 : pazsan 1.5 2over 2over d< IF 2swap THEN 2drop ;
46 : anton 1.4
47 :     \ shell commands
48 :    
49 : crook 1.10 0 Value $? ( -- n ) \ gforth dollar-question
50 : crook 1.12 \G @code{Value} -- the exit status returned by the most recently executed
51 : crook 1.9 \G @code{system} command.
52 : anton 1.4
53 : anton 1.14 : system ( c-addr u -- ) \ gforth
54 :     \G Pass the string specified by @var{c-addr u} to the host operating system
55 : crook 1.9 \G for execution in a sub-shell.
56 : anton 1.4 (system) throw TO $? ;
57 : crook 1.9
58 : anton 1.4 : sh ( "..." -- ) \ gforth
59 : crook 1.9 \G Parse a string and use @code{system} to pass it to the host
60 :     \G operating system for execution in a sub-shell.
61 : anton 1.4 '# parse cr system ;
62 :    
63 : anton 1.8 \ stuff
64 :    
65 : crook 1.10 : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
66 :     \G equivalent to @code{] literal}
67 : anton 1.8 ] 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< ;
74 : anton 1.17
75 :     \ const-does>
76 :    
77 :     : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
78 : anton 1.18 \ compile u literals, starting with the bottommost one
79 : anton 1.17 ?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
85 : anton 1.18 \ compile u fliterals, starting with the bottommost one
86 : anton 1.17 ?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" -- )
92 : anton 1.18 \ define a colon definition "name" containing w*uw r*ur as
93 :     \ literals and a call to target.
94 : anton 1.17 { 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" -- )
100 : anton 1.18 \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>}.
103 : anton 1.17 here >r 0 POSTPONE literal
104 :     POSTPONE (const-does>)
105 :     POSTPONE ;
106 :     noname : POSTPONE rdrop
107 :     lastxt r> cell+ ! \ patch the literal
108 :     ; immediate
109 : anton 1.19
110 : anton 1.20 \ !! rewrite slurp-file using slurp-fid
111 : anton 1.19 : slurp-file ( c-addr1 u1 -- c-addr2 u2 )
112 : anton 1.20 \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
113 : anton 1.19 r/o bin open-file throw >r
114 :     r@ file-size throw abort" file too large"
115 :     dup allocate throw swap
116 :     2dup r@ read-file throw over <> abort" could not read whole file"
117 :     r> close-file throw ;
118 :    
119 : anton 1.20 : slurp-fid { fid -- addr u }
120 :     \G @var{addr u} is the content of the file @var{fid}
121 :     0 0 begin ( awhole uwhole )
122 :     dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew )
123 :     rot r@ fid read-file throw ( awhole uwhole uread R: unew )
124 :     r> 2dup =
125 :     while ( awhole uwhole uread unew )
126 :     2drop
127 :     repeat
128 :     - + dup >r resize throw r> ;
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