[gforth] / gforth / kernel / io.fs  

gforth: gforth/kernel/io.fs

1 : anton 1.1 \ input output basics (extra since) 02mar97jaw
2 :    
3 : anton 1.29 \ Copyright (C) 1995,1996,1997,1998,2000,2003,2006,2007 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 : anton 1.30 \ as published by the Free Software Foundation, either version 3
10 : anton 1.1 \ 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 : anton 1.30 \ along with this program. If not, see http://www.gnu.org/licenses/.
19 : anton 1.1
20 : jwilke 1.12 require ./basics.fs
21 :    
22 : jwilke 1.2 \ Output 13feb93py
23 :    
24 : jwilke 1.3 has? os [IF]
25 : jwilke 1.2 0 Value outfile-id ( -- file-id ) \ gforth
26 : pazsan 1.5 0 Value infile-id ( -- file-id ) \ gforth
27 : pazsan 1.7
28 : jwilke 1.2 : (type) ( c-addr u -- ) \ gforth
29 :     outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
30 :     ;
31 :    
32 :     : (emit) ( c -- ) \ gforth
33 :     outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
34 :     ;
35 : pazsan 1.5
36 :     : (key) ( -- c ) \ gforth
37 :     infile-id key-file ;
38 :    
39 :     : (key?) ( -- flag ) \ gforth
40 :     infile-id key?-file ;
41 : jwilke 1.2 [THEN]
42 :    
43 : pazsan 1.7 undef-words
44 : pazsan 1.13
45 : pazsan 1.7 Defer type ( c-addr u -- ) \ core
46 : crook 1.9 \G If @var{u}>0, display @var{u} characters from a string starting
47 :     \G with the character stored at @var{c-addr}.
48 : pazsan 1.13 [IFDEF] write-file
49 :     : (type) 0 write-file drop ;
50 :     [ELSE]
51 : crook 1.9 : (type) BEGIN dup WHILE
52 :     >r dup c@ (emit) 1+ r> 1- REPEAT 2drop ;
53 : pazsan 1.13 [THEN]
54 : pazsan 1.4
55 : pazsan 1.7 [IFDEF] (type) ' (type) IS Type [THEN]
56 : jwilke 1.2
57 :     Defer emit ( c -- ) \ core
58 : crook 1.8 \G Display the character associated with character value c.
59 : pazsan 1.7 : (emit) ( c -- ) \ gforth
60 :     0 emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
61 :     ;
62 :    
63 :     [IFDEF] (emit) ' (emit) IS emit [THEN]
64 : jwilke 1.2
65 : crook 1.10 Defer key ( -- char ) \ core
66 :     \G Receive (but do not display) one character, @var{char}.
67 : pazsan 1.28 : (key) ( -- c ) \ gforth
68 :     infile-id key-file ;
69 :     : infile-id stdin ;
70 : pazsan 1.7
71 :     [IFDEF] (key) ' (key) IS key [THEN]
72 : pazsan 1.5
73 : crook 1.14 Defer key? ( -- flag ) \ facility key-question
74 : crook 1.10 \G Determine whether a character is available. If a character is
75 :     \G available, @var{flag} is true; the next call to @code{key} will
76 :     \G yield the character. Once @code{key?} returns true, subsequent
77 : anton 1.19 \G calls to @code{key?} before calling @code{key} or @code{ekey} will
78 : crook 1.10 \G also return true.
79 : pazsan 1.28 : (key?) ( -- flag ) \ gforth
80 :     infile-id key?-file ;
81 :     : infile-id stdin ;
82 : pazsan 1.7
83 :     [IFDEF] (key?) ' (key?) IS key? [THEN]
84 :    
85 :     all-words
86 : jwilke 1.2
87 :     : (.") "lit count type ;
88 :     : (S") "lit count ;
89 :    
90 : anton 1.1 \ Input 13feb93py
91 :    
92 : pazsan 1.25 04 constant #eof ( -- c ) \ gforth
93 : anton 1.1 07 constant #bell ( -- c ) \ gforth
94 :     08 constant #bs ( -- c ) \ gforth
95 :     09 constant #tab ( -- c ) \ gforth
96 :     7F constant #del ( -- c ) \ gforth
97 :     0D constant #cr ( -- c ) \ gforth
98 :     \ the newline key code
99 :     0C constant #ff ( -- c ) \ gforth
100 :     0A constant #lf ( -- c ) \ gforth
101 :    
102 : jwilke 1.3 : bell #bell emit [ has? os [IF] ] outfile-id flush-file drop [ [THEN] ] ;
103 : crook 1.14 : cr ( -- ) \ core c-r
104 : anton 1.17 \G Output a newline (of the favourite kind of the host OS). Note
105 :     \G that due to the way the Forth command line interpreter inserts
106 :     \G newlines, the preferred way to use @code{cr} is at the start
107 :     \G of a piece of text; e.g., @code{cr ." hello, world"}.
108 :     newline type ;
109 : anton 1.1
110 : crook 1.8 : space ( -- ) \ core
111 :     \G Display one space.
112 :     bl emit ;
113 :    
114 : pazsan 1.27 has? os 0= [IF]
115 : crook 1.8 : spaces ( n -- ) \ core
116 :     \G If n > 0, display n spaces.
117 :     0 max 0 ?DO space LOOP ;
118 : pazsan 1.7 : backspaces 0 max 0 ?DO #bs emit LOOP ;
119 :     [ELSE]
120 : anton 1.1 \ space spaces 21mar93py
121 :     decimal
122 :     Create spaces ( u -- ) \ core
123 : anton 1.18 \G Display @var{n} spaces.
124 : crook 1.8 bl 80 times \ times from target compiler! 11may93jaw
125 : anton 1.1 DOES> ( u -- )
126 : crook 1.8 swap
127 :     0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
128 : anton 1.1 Create backspaces
129 : crook 1.8 08 80 times \ times from target compiler! 11may93jaw
130 : anton 1.1 DOES> ( u -- )
131 : crook 1.8 swap
132 :     0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
133 : anton 1.1 hex
134 :     [THEN]
135 :    
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