1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
\input webmac
% NASTY.TEX. Designed to catch bugs in Crudetype device driver
% Here is TeX material that gets inserted after \input webmac
\message{!! For lineprinter, magnify me to 115 percent !!}
\def\hang{\hangindent 3em\indent\ignorespaces}
\font\ninerm=cmr9
\let\mc=\ninerm % medium caps for names like PASCAL
\def\PASCAL{{\mc PASCAL}}
\def\pb{$\.|\ldots\.|$} % pascal brackets (|...|)
\def\v{\.{\char'174}} % vertical (|) in typewriter font
\mathchardef\BA="3224 % double arrow
\def\({} % kludge for alphabetizing certain module names
\def\title{TANGLE}
\def\contentspagenumber{0}
\def\topofcontents{\null\vfill
\titlefalse % include headline on the contents page
\def\rheader{\mainfont Appendix E\hfil \contentspagenumber}
\centerline{\titlefont The {\ttitlefont TANGLE} processor}
\vskip 15pt
\centerline{(Version 2.5)}
\vfill}
\pageno=\contentspagenumber \advance\pageno by 1
\def\title{TANGLE changes for \AA Vax/VMS}
\N199\*. System-dependent \AA changes.
Here are the remaining changes to the program
that are necessary to make \.{TANGLE} work on Vax/VMS.
\fi
\M1. \P$\X1:\X\S$\6
$\\{store\_two\_bytes}(\O{150000}+\\{module\_count})$;\C{$\O{150000}=\O{320}%
\ast\O{400}$}\par
\fi
\M200\*. This variable is for speeding up the output routine.
\Y\P$\4\X9:Globals in the outer block\X\mathrel{+}\S$\6
\4\\{out\_temp\_buffer}: \37\&{packed} \37\&{array} $[1\to\\{out\_buf\_size}]$ %
\1\&{of}\5
\\{char};\2\par
\fi
\M201\*. On Vax/VMS we need the following special definitions, types, variables
and procedures to be able to get the file name from the command line,
or to prompt for them.
\Y\P\D \37$\\{VAX\_volatile}\S\={volatile}$\par
\P\D \37$\\{VAX\_lib\_get\_foreign}\S\={\ lib\$get\_foreign}$\par
\P\D \37$\\{VAX\_length}\S\={length\ }$\par
\fi
\M143. Inputting the next token.
As stated above, \.{TANGLE}'s most interesting input procedure is the
\\{get\_next} routine that inputs the next token. However, the procedure
isn't especially difficult.
Another global variable, \\{scanning\_hex}, is \\{true} during the time that
the letters \.A through \.F should be treated as if they were digits.
\Y\P$\4\X9:Globals in the outer block\X\mathrel{+}\S$\6
\4\\{cur\_module}: \37\\{name\_pointer};\C{name of module just scanned}\6
\4\\{scanning\_hex}: \37\\{boolean};\C{are we scanning a hexadecimal constant?}%
\par
\fi
\M144. \P$\X10:Set initial values\X\mathrel{+}\S$\6
$\\{scanning\_hex}\K\\{false}$;\par
\fi
\M146. \P$\X146:Go to \\{found} if \|c is a hexadecimal digit, otherwise set $%
\\{scanning\_hex}\K\\{false}$\X\S$\6
\&{if} $((\|c\G\.{"0"})\W(\|c\L\.{"9"}))\V((\|c\G\.{"A"})\W(\|c\L\.{"F"}))$ \1%
\&{then}\5
\&{goto} \37\\{found}\6
\4\&{else} $\\{scanning\_hex}\K\\{false}$\2\par
\U section~145.\fi
\def \<{\lbrack} \def \>{\rbrack}
\def \nl{\hfill\break}
\font\stt=cmtt9
\font\rr=cmr10
\def\cstok#1{\leavevmode\thinspace\hbox{\vrule\vtop{\vbox{\hrule\kern1pt
\hbox{\vphantom{\stt/}\thinspace{\stt#1}\thinspace}}
\kern1pt\hrule}\vrule}\thinspace} % control sequence token
% %\def \boxit#1{\vbox{\hrule\hbox{\vrule\kern3pt
% % \vbox{\kern3pt#1\kern3pt}\kern3pt\vrule}\hrule}}
% \rr
\vskip 0.5in
\centerline{EXAM MARKING PROGRAM}
1. When the program types a question mark, it is asking you for input.
All input must be terminated by typing the \cstok{RETURN} key.
2. Whenever you do not know what to do next ALWAYS start by typing a question
mark, or {\tt H}
(stands for HELP) (followed by \cstok{RETURN}). This should give a help
message.
\vskip 0.5in
\centerline{Method of use}
\vskip 0.4in
Whenever the program types a question mark, it is asking you for input.
All input must be terminated by typing the \cstok{RETURN} key. On some
terminals this is labelled \cstok{ENTER}, on others it has a bent arrow. You
cannot type ahead. You have to type 1 line at a time \& wait for the program
to digest it. This line-at-a-time mode of operation is very old fashioned and
clumsy, but I did not think it would be practical to attempt anything better
with the present combination of a slow VAX, and VMS, and bug-eaten network.
\N206\*. Index.
\ch 1\*, 2\*, 3\*, 4\*, 7\*, 12\*, 20\*, 21\*, 22\*, 26\*, 27\*, 28\*, 38\*, 97%
\*, 179\*, 180\*, 182\*, 187\*, 199\*, 200\*, 201\*, 202\*, 203\*, 204\*, 205%
\*, 206\*.
\inx
\:\.{ Nested named module }, 189.
\:\.{\AT!d is ignored in PASCAL text}, 167.
\:\.{\AT!f is ignored in PASCAL text}, 167.
\:\.{\AT!p is ignored in PASCAL text}, 167.
\:\|{a}, \[74], \[87], \[165].
\:\\{abs}, 103, 157.
\:\\{accumulator}, \[157], 158, 159.
\:\\{add\_in}, \[157], 158.
\:\.{Ambiguous prefix}, 69.
\:\\{and\_sign}, \[15], 76, 114.
\:\\{app}, \[99], 101, 102, 103, 111.
\:\\{app\_repl}, \[93], 165, 166, 167, 168, 169.
\:\\{app\_val}, \[99], 103, 111.
\:{ASCII code}, 11, 72.
\:\\{ASCII\_code}, \[11], 13, 27\*, 28\*, 38\*, 50, 65, 94, 95, 100, 126, 139,
141, 165, 198.
\:\\{ask}, \[203\*], 205\*.
\:\|{b}, \[87], \[97\*], \[165].
\:\.{bad character in input...}, 197.
\:\\{bad\_case}, \[107], 109, 110.
\:\\{bal}, \[87], 93, \[141], 142, \[165], 166.
\:\\{banner}, \[1\*], 182\*.
\:\&{begin}, 3\*.
\:\\{begin\_comment}, \[72], 76, 121, 139, 147, 196.
\:\\{begin\_pascal}, \[139], 156, 158, 167, 175.
\:\\{boolean}, 28\*, 29, 124, 127, 143, 179\*, 193, 194, 203\*.
\:\\{brace\_level}, \[82], 83, 98, 121, 196.
\:\\{cur\_module}, \[143], 151, 167, 175.
\:\\{cur\_name}, 78, \[79], 83, 84, 85.
\:\\{cur\_repl}, 78, \[79], 80, 83, 84, 85.
\:\\{cur\_repl\_text}, \[164], 165, 170, 175, 178.
\:\\{cur\_state}, \[79], 84, 85.
\:\\{cur\_val}, \[86], 87, 89, 116, 119, 121, 196.
\par\vfil\end
|
