1: \ miscelleneous words
2:
3: \ Copyright (C) 1996,1997,1998,2000 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20:
21: require glocals.fs
22:
23: ' require alias needs ( ... "name" -- ... ) \ gforth
24: \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
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 ;
37:
38: \ DMIN and DMAX
39:
40: : dmin ( d1 d2 -- d ) \ double d-min
41: 2over 2over d> IF 2swap THEN 2drop ;
42:
43:
44: : dmax ( d1 d2 -- d ) \ double d-max
45: 2over 2over d< IF 2swap THEN 2drop ;
46:
47: \ shell commands
48:
49: 0 Value $? ( -- n ) \ gforth dollar-question
50: \G @code{Value} -- the exit status returned by the most recently executed
51: \G @code{system} command.
52:
53: : system ( c-addr u -- ) \ gforth
54: \G Pass the string specified by @var{c-addr u} to the host operating system
55: \G for execution in a sub-shell.
56: (system) throw TO $? ;
57:
58: : sh ( "..." -- ) \ gforth
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.
61: '# parse cr system ;
62:
63: \ stuff
64:
65: : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
66: \G equivalent to @code{] literal}
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< ;
74:
75: \ const-does>
76:
77: : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
78: \ compile u literals, starting with the bottommost one
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
85: \ compile u fliterals, starting with the bottommost one
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" -- )
92: \ define a colon definition "name" containing w*uw r*ur as
93: \ literals and a call to target.
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" -- )
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>}.
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
109:
110: \ !! rewrite slurp-file using slurp-fid
111: : slurp-file ( c-addr1 u1 -- c-addr2 u2 )
112: \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
113: 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: : 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> ;
129:
130: : str= ( c-addr1 u1 c-addr2 u2 -- f )
131: compare 0= ;
132:
133: : string-prefix? ( c-addr1 u1 c-addr2 u2 -- f )
134: \G Is @var{c-addr2 u2} a prefix of @var{c-addr1 u1}?
135: tuck 2>r min 2r> compare 0= ;
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