TANGLE change file for Vax/VMS
Copyright (C) 1983 by David Fuchs.  All rights are reserved.
21Oct85 JLC  .Increased max_toks to tangle inimf 0.9999.

@x
\pageno=\contentspagenumber \advance\pageno by 1
@y
\pageno=\contentspagenumber \advance\pageno by 1
\let\maybe=\iffalse
\def\title{TANGLE changes for Vax/VMS}
@z

@x
@d banner=='This is TANGLE, Version 2.8'
@y
@d banner=='This is TANGLE, Vax/VMS Version 2.8'
@z

@x
and the string pool output goes to file |pool|.
@y
and the string pool output goes to file |pool|.
VMS requires us to mention |input| and |output| in the program header, too.
They are used for terminal input and output.
@z

@x
program TANGLE(@!web_file,@!change_file,@!Pascal_file,@!pool);
@y
program TANGLE(@!input,@!output,@!web_file,@!change_file,@!Pascal_file,
       @!pool);
@z

@x
@<Compiler directives@>=
@{@&$C-,A+,D-@} {no range check, catch arithmetic overflow, no debug overhead}
@!debug @{@&$C+,D+@}@+ gubed {but turn everything on when debugging}
@y
On Vax/VMS, things are a bit different.

@<Compiler directives@>=
@=[check(none)]@> {no debug overhead, but...}
debug @=[check(all)]@> gubed {turn everything on when debugging}
@z

@x
@d othercases == others: {default for cases not listed explicitly}
@y
@d othercases == otherwise {Vax/VMS default for cases not listed
explicitly}
@z

@x
@!max_toks=50000; {|1/zz| times the number of bytes in compressed \PASCAL\ code;
 must be less than 65536}
@y
@!max_toks=51000; {|1/zz| times the number of bytes in compressed \PASCAL\ code;
 must be less than 65536}
@z

@x
@!text_file=packed file of text_char;
@y
@!text_file=text;
@z

@x
@d print_ln(#)==write_ln(term_out,#) {`|print|' and then start new line}
@d new_line==write_ln(term_out) {start new line}
@y
@d print_ln(#)==write_ln(term_out,#,chr(13),chr(10))
       {`|print|' and then start new line}
@d new_line==write_ln(term_out,chr(13),chr(10)) {start new line}
@z

@x
rewrite(term_out,'TTY:'); {send |term_out| output to the terminal}
@y
open(term_out,'SYS$OUTPUT',@=carriage_control:=none@>);
rewrite(term_out);
@z

@x
@d update_terminal == break(term_out) {empty the terminal output buffer}
@y
@d update_terminal == write_ln(term_out) {empty the terminal output buffer}
@z

@x
@ The following code opens |Pascal_file| and |pool|.
Since these files were listed in the program header, we assume that the
\PASCAL\ runtime system has checked that suitable external file names have
been given.
@^system dependencies@>

@<Set init...@>=
rewrite(Pascal_file); rewrite(pool);
@y
@ The following code opens |Pascal_file| and |pool|.
Acutally, on Vax/VMS this task is put off until later.
@^system dependencies@>
@z

@x
@ Input goes into an array called |buffer|.

@<Globals...@>=@!buffer: array[0..buf_size] of ASCII_code;
@y
@ Input goes into an array called |buffer|.
Actually, it is first read into |temp_buffer|.
@<Glob...@>=
@!buffer: array[0..buf_size] of ASCII_code;
@!temp_buffer: varying [buf_size] of char;
@z

@x
@p function input_ln(var f:text_file):boolean;
 {inputs a line or returns |false|}
var final_limit:0..buf_size; {|limit| without trailing blanks}
begin limit:=0; final_limit:=0;
if eof(f) then input_ln:=false
else  begin while not eoln(f) do
   begin buffer[limit]:=xord[f^]; get(f);
   incr(limit);
   if buffer[limit-1]<>" " then final_limit:=limit;
   if limit=buf_size then
     begin while not eoln(f) do get(f);
     decr(limit); {keep |buffer[buf_size]| empty}
     print_nl('! Input line too long'); loc:=0; error;
@.Input line too long@>
     end;
   end;
 read_ln(f); limit:=final_limit; input_ln:=true;
 end;
end;
@y
On Vax/VMS we first read a line into |temp_buffer|, since that's faster.

@p function input_ln(var f:text_file):boolean;
 {inputs a line or returns |false|}
var i,@!l:0..buf_size;
begin limit:=0;
if eof(f) then input_ln:=false
else  begin
       read(f,temp_buffer);
       l:=temp_buffer.@=length@>;
       for i:=1 to l do begin
               buffer[i-1]:=xord[temp_buffer[i]];
               if buffer[i-1]<>" " then limit:=i;
               end;
       if not eoln(f) then begin
               print_nl('! Input line too long'); error;
@.Input line too long@>
               end
       else read_ln(f);
       input_ln:=true;
       end;
end;
@z

@x
@d ww=2 {we multiply the byte capacity by approximately this amount}
@y
@d ww=3 {we multiply the byte capacity by approximately this amount}
@z

@x
for k:=1 to break_ptr do write(Pascal_file,xchr[out_buf[k-1]]);
write_ln(Pascal_file); incr(line);
@y
for k:=1 to break_ptr do out_temp_buffer[k]:=xchr[out_buf[k-1]];
write_ln(Pascal_file,substr(out_temp_buffer,1,break_ptr)); incr(line);
@z

@x
@!term_in:text_file; {the user's terminal as an input file}
@y
@z

@x
@<Set init...@>=
@y
@d term_in==input

@<Set init...@>=
@z

@x
reset(term_in,'TTY:','/I'); {open |term_in| as the terminal, don't do a |get|}
@y
@z

@x save pool and Pascal files only if they were written to.
if string_ptr>128 then @<Finish off the string pool file@>;
stat @<Print statistics about memory usage@>;@+tats@;@/
@t\4\4@>{here files should be closed if the operating system requires it}
@y
if history<fatal_message then begin
       if string_ptr>128 then begin @<Finish off the string pool file@>;
               close(pool,@=disposition:=save@>,@=error:=continue@>);
               end;
       close(Pascal_file,@=disposition:=save@>,@=error:=continue@>);
       end;
stat @<Print statistics about memory usage@>;@+tats@;@/
@z

@x
This module should be replaced, if necessary, by changes to the program
that are necessary to make \.{TANGLE} work at a particular installation.
It is usually best to design your change file so that all changes to
previous modules preserve the module numbering; then everybody's version
will be consistent with the printed program. More extensive changes,
which introduce new modules, can be inserted here; then only the index
itself will get a new module number.
@y
Here are the remaining changes to the program
that are necessary to make \.{TANGLE} work on Vax/VMS.


@ This variable is for speeding up the output routine.

@<Glob...@>=
@!out_temp_buffer:packed array [1..out_buf_size] of char;

@ 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.

@d VAX_volatile==@=volatile@>
@d VAX_immed==@=%immed @>
@d VAX_external==@=external@>
@d VAX_stdescr==@=%stdescr @>
@d VAX_lib_get_foreign==@= lib$get_foreign@>
@d VAX_length==@=length @>

@ @<Local...@>=
@!command_line:packed array[1..300] of char;
@!cmd_len:sixteen_bits;
@!cmd_i:integer;
@!file_name,@!default_file_name:varying [300] of char;
@!ask,@!got_file_name: boolean;

@ Here is the library procedure that gets the user's command line.

@<Error...@>=
[VAX_external] function VAX_lib_get_foreign(
 VAX_stdescr cmdlin:[VAX_volatile] packed array [$l1..$u1:integer] of char
       := VAX_immed 0;
 VAX_stdescr prompt:[VAX_volatile] packed array [$l2..$u2:integer] of char
       := VAX_immed 0;
 var len : [VAX_volatile] sixteen_bits := VAX_immed 0;
 var flag : [VAX_volatile] integer := VAX_immed 0)
   :integer; extern;

@ We get the external file names, and then call |open|
to associate an external file with each file variable.

@<Set init...@>=
cmd_i:=0;
VAX_lib_get_foreign(command_line,,cmd_len,cmd_i);
cmd_i:=1; while (cmd_i<=cmd_len) and (command_line[cmd_i]=' ') do incr(cmd_i);
got_file_name:=cmd_i<=cmd_len;
if got_file_name then
       default_file_name:=substr(command_line,cmd_i,cmd_len-cmd_i+1);

if got_file_name then begin
       file_name:=default_file_name+'.WEB';
       open(web_file,file_name,@=readonly@>,@=error:=continue@>);
       ask:=status(web_file)<>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end
else ask:=true;
while ask do begin
       got_file_name:=false;
       write('Web file: ');
       if eof then begin mark_fatal; jump_out; end;
       read_ln(file_name);
       open(web_file,file_name,@=readonly@>,@=error:=continue@>);
       ask:=status(web_file)<>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end;

if got_file_name then begin
       file_name:=default_file_name+'.CH';
       open(change_file,file_name,@=readonly@>,@=error:=continue@>);
       ask:=status(change_file)>0; {can be empty}
       if ask then write_ln('Couldn''t open ',file_name);
       end
else ask:=true;
while ask do begin
       write('Change file: ');
       if eof then begin mark_fatal; jump_out; end;
       read_ln(file_name);
       if file_name.VAX_length=0 then file_name:='NL:';
       open(change_file,file_name,@=readonly@>,@=error:=continue@>);
       ask:=status(change_file)>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end;

if got_file_name then begin
       cmd_i:=1;
       for cmd_len:=1 to default_file_name.VAX_length do
               if (default_file_name[cmd_len]=']')
               or (default_file_name[cmd_len]=':')
               then cmd_i:=cmd_len+1;
       if cmd_i<=default_file_name.VAX_length then
               default_file_name:=substr(default_file_name,cmd_i,
                       default_file_name.VAX_length-cmd_i+1);
       end;

if got_file_name then begin
       file_name:=default_file_name+'.PAS';
       open(Pascal_file,file_name,@=new,disposition:=delete@>,
               @=error:=continue@>);
       ask:=status(Pascal_file)>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end
else ask:=true;
while ask do begin
       write('Pascal file: ');
       if eof then begin mark_fatal; jump_out; end;
       read_ln(file_name);
       open(Pascal_file,file_name,@=new,disposition:=delete@>,
               @=error:=continue@>);
       ask:=status(Pascal_file)>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end;

if got_file_name then begin
       file_name:=default_file_name+'.POO';
       open(pool,file_name,@=new,disposition:=delete@>,@=error:=continue@>);
       ask:=status(pool)>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end
else ask:=true;
while ask do begin
       write('Pool file: ');
       if eof then begin mark_fatal; jump_out; end;
       read_ln(file_name);
       open(pool,file_name,@=new,disposition:=delete@>,@=error:=continue@>);
       ask:=status(pool)>0;
       if ask then write_ln('Couldn''t open ',file_name);
       end;

rewrite(Pascal_file); rewrite(pool);
@z

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.