[gforth] / gforth / kernel / nio.fs  

gforth: gforth/kernel/nio.fs

1 : anton 1.1 \ Number IO
2 :    
3 : anton 1.23 \ 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 1.22 \ 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 1.22 \ along with this program. If not, see http://www.gnu.org/licenses/.
19 : anton 1.1
20 : jwilke 1.11 require ./io.fs
21 :    
22 : crook 1.10 : pad ( -- c-addr ) \ core-ext
23 :     \G @var{c-addr} is the address of a transient region that can be
24 :     \G used as temporary data storage. At least 84 characters of space
25 :     \G is available.
26 : pazsan 1.20 [ has? flash [IF] ] normal-dp @ [ [ELSE] ] here [ [THEN] ]
27 :     word-pno-size + aligned ;
28 : anton 1.1
29 :     \ hold <# #> sign # #s 25jan92py
30 :    
31 : pazsan 1.19 has? EC [IF]
32 :     : hld ( -- addr ) pad cell - ;
33 :     : hold ( char -- ) hld -1 over +! @ c! ;
34 :     : <# hld dup ! ;
35 :     : #> ( d -- addr +n ) 2drop hld dup @ tuck - ;
36 :     ' <# alias <<#
37 :     ' noop alias #>>
38 :     [ELSE]
39 : anton 1.1 : hold ( char -- ) \ core
40 : crook 1.10 \G Used within @code{<#} and @code{#>}. Append the character
41 :     \G @var{char} to the pictured numeric output string.
42 : anton 1.6 -1 chars holdptr +!
43 :     holdptr @ dup holdbuf u< -&17 and throw
44 :     c! ;
45 : anton 1.1
46 :     : <# ( -- ) \ core less-number-sign
47 : crook 1.5 \G Initialise/clear the pictured numeric output string.
48 : anton 1.7 holdbuf-end dup holdptr ! holdend ! ;
49 : anton 1.1
50 :     : #> ( xd -- addr u ) \ core number-sign-greater
51 : crook 1.13 \G Complete the pictured numeric output string by discarding
52 :     \G @var{xd} and returning @var{addr u}; the address and length of
53 :     \G the formatted string. A Standard program may modify characters
54 : crook 1.5 \G within the string.
55 : anton 1.7 2drop holdptr @ holdend @ over - ;
56 : anton 1.6
57 : anton 1.7 : <<# ( -- ) \ gforth less-less-number-sign
58 : crook 1.9 \G Start a hold area that ends with @code{#>>}. Can be nested in
59 : anton 1.6 \G each other and in @code{<#}. Note: if you do not match up the
60 :     \G @code{<<#}s with @code{#>>}s, you will eventually run out of
61 :     \G hold area; you can reset the hold area to empty with @code{<#}.
62 : anton 1.7 holdend @ holdptr @ - hold
63 :     holdptr @ holdend ! ;
64 : anton 1.6
65 : anton 1.7 : #>> ( -- ) \ gforth number-sign-greater-greater
66 : crook 1.9 \G Release the hold area started with @code{<<#}.
67 : anton 1.8 holdend @ dup holdbuf-end u>= -&11 and throw
68 :     count chars bounds holdptr ! holdend ! ;
69 : pazsan 1.19 [THEN]
70 : anton 1.1
71 :     : sign ( n -- ) \ core
72 : crook 1.13 \G Used within @code{<#} and @code{#>}. If @var{n} (a @var{single}
73 :     \G number) is negative, append the display code for a minus sign
74 :     \G to the pictured numeric output string. Since the string is
75 :     \G built up ``backwards'' this is usually used immediately prior
76 :     \G to @code{#>}, as shown in the examples below.
77 : anton 1.1 0< IF [char] - hold THEN ;
78 :    
79 :     : # ( ud1 -- ud2 ) \ core number-sign
80 : crook 1.13 \G Used within @code{<#} and @code{#>}. Add the next
81 :     \G least-significant digit to the pictured numeric output
82 :     \G string. This is achieved by dividing @var{ud1} by the number in
83 :     \G @code{base} to leave quotient @var{ud2} and remainder @var{n};
84 :     \G @var{n} is converted to the appropriate display code (eg ASCII
85 :     \G code) and appended to the string. If the number has been fully
86 :     \G converted, @var{ud1} will be 0 and @code{#} will append a ``0''
87 :     \G to the string.
88 : anton 1.12 base @ ud/mod rot 9 over <
89 : anton 1.1 IF
90 :     [ char A char 9 - 1- ] Literal +
91 :     THEN
92 :     [char] 0 + hold ;
93 :    
94 : crook 1.5 : #s ( ud -- 0 0 ) \ core number-sign-s
95 :     \G Used within @code{<#} and @code{#>}. Convert all remaining digits
96 :     \G using the same algorithm as for @code{#}. @code{#s} will convert
97 : crook 1.13 \G at least one digit. Therefore, if @var{ud} is 0, @code{#s} will append
98 :     \G a ``0'' to the pictured numeric output string.
99 : anton 1.1 BEGIN
100 :     # 2dup or 0=
101 :     UNTIL ;
102 :    
103 :     \ print numbers 07jun92py
104 :    
105 :     : d.r ( d n -- ) \ double d-dot-r
106 : crook 1.9 \G Display @var{d} right-aligned in a field @var{n} characters wide. If more than
107 :     \G @var{n} characters are needed to display the number, all digits are displayed.
108 : crook 1.13 \G If appropriate, @var{n} must include a character for a leading ``-''.
109 : anton 1.7 >r tuck dabs <<# #s rot sign #>
110 :     r> over - spaces type #>> ;
111 : anton 1.1
112 :     : ud.r ( ud n -- ) \ gforth u-d-dot-r
113 : crook 1.9 \G Display @var{ud} right-aligned in a field @var{n} characters wide. If more than
114 :     \G @var{n} characters are needed to display the number, all digits are displayed.
115 : anton 1.7 >r <<# #s #> r> over - spaces type #>> ;
116 : anton 1.1
117 :     : .r ( n1 n2 -- ) \ core-ext dot-r
118 : crook 1.9 \G Display @var{n1} right-aligned in a field @var{n2} characters wide. If more than
119 :     \G @var{n2} characters are needed to display the number, all digits are displayed.
120 : crook 1.13 \G If appropriate, @var{n2} must include a character for a leading ``-''.
121 : anton 1.1 >r s>d r> d.r ;
122 : crook 1.5
123 : anton 1.1 : u.r ( u n -- ) \ core-ext u-dot-r
124 : crook 1.9 \G Display @var{u} right-aligned in a field @var{n} characters wide. If more than
125 :     \G @var{n} characters are needed to display the number, all digits are displayed.
126 : anton 1.1 0 swap ud.r ;
127 :    
128 :     : d. ( d -- ) \ double d-dot
129 : crook 1.9 \G Display (the signed double number) @var{d} in free-format. followed by a space.
130 : anton 1.1 0 d.r space ;
131 : crook 1.5
132 : anton 1.1 : ud. ( ud -- ) \ gforth u-d-dot
133 : crook 1.9 \G Display (the signed double number) @var{ud} in free-format, followed by a space.
134 : anton 1.1 0 ud.r space ;
135 :    
136 :     : . ( n -- ) \ core dot
137 : crook 1.9 \G Display (the signed single number) @var{n} in free-format, followed by a space.
138 : anton 1.1 s>d d. ;
139 : crook 1.5
140 : anton 1.1 : u. ( u -- ) \ core u-dot
141 : crook 1.9 \G Display (the unsigned single number) @var{u} in free-format, followed by a space.
142 : anton 1.1 0 ud. ;
143 :    
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