tower@mit-prep (08/13/85)
From: Leonard H. Tower Jr. <tower@mit-prep>
The only changes to TeX needed to run off the GNU emacs manual are
made in file initex.ch under directory TeX82 in the Unix-TeX
distribution from the University of Washington, before tex is built.
I have included two files here to assist you:
initex.ch
- the initex.ch used to build TeX on mit-prep
diff-dist-initex.ch
- a "diff -c" of dist_initex.ch and initex.ch .
dist_initex.ch is the distributed version of
initex.ch .
-------------------------------- initex.ch --------------------------------
% Change file for Berkeley UNIX, for a hacked version of the pc pascal
% compiler (with the others: clause in case statements).
%
% Distant relation of David Fuchs' Sep 13, 1982 TOPS20 version, greatly
% modified by Howard Trickey and Pavel Curtis
% Modification History:
%
% (10/9) HWT Brought up to version 0.1
% (10/13) HWT Fixed bug in hpack
% (10/17) HWT Changed to version 0.3
% (10/22) HWT Brought up to version 0.4
% (10/26) HWT Changed to use version 0.5 source
% (11/19) HWT Changed to use version 0.8 source; fixed glue_ratios to use
% external C procedures
% (11/30) HWT Changed to use new tangle, with verbatim Pascal mode, to avoid
% need for editing in the #include statement
% (changed modules 4,9)
% (1/15/83) HWT Changed to use version 0.94 source; added Pavel's changes to
% allow undumping; added Grim's fix for grtofl, etc.;
% modified for Knuth's new tangle.
% (2/1/83) PC Consolidated with Pavel's version, changed the fl<->gr
% routines to avoid slow and messy union type.
% (3/18/83) HWT Changed to use version 0.96 source (means changing fltogr and
% grtofl to unfloat and float, then getting rid of a lot of
% changes); made TeX print a newline
% at the end of the run.
% (4/2/83) PC Added call to exit() at end of run, with exit-value dependent
% upon the value of `history'.
% (4/16/83) PC Brought up to version 0.97 of TeX.
% (5/23/83) HWT Changed mem_max to 30000 for initex (because of latex)
% (6/2/83) HWT Brought up to version 0.98 of TeX. Changed some of the
% string-related constants to match the latest tops20
% change file. Modified input_ln and write_dvi to use external
% C procedures, for speed increase. Changed file opening
% procedures to use external C procedure to test for
% accessibility, so that now none of the pc runtime library
% programs need to be modified (though close1 is still needed)
% (6/28/83) HWT Brought up to 0.99, with new change file format.
% (7/17/83) HWT Brought up to 0.999. Added switch-to-editor stuff.
% (7/29/83) HWT Brought up to 0.9999.
% (11/4/83) HWT Brought up to 0.999999.
% (11/16/83) HWT Brought up to 1.0. Upped max_strings, string_vacancies,
% pool_size, hash_size, and hash_prime, to agree with
% TOPS20-changes constants.
% (1/4/84) HWT Again, upped pool_size to 40000 for LaTeX.
% (2/18/84) HWT Made changes to use search path stuff in new ext.c. Now all
% the path specific stuff is localized to texpaths.h
% (6/6/84) HWT Brought up to 1.1. Upped pool_size and hash_size for LaTeX.
% (31/7/84) HWT Removed the forgetting of the full file name, so that
% switch-to-editor works for non-primary file.
% Use this file as is to make an INITEX. To get production TEX, use the
% shell script ``ini_to_vir'' and re-TANGLE.
% NOTE: the module numbers in this change file refer to the Version 0.999
% listing (red cover) made in July 1983.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [0] WEAVE: only print changes
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
\def\botofcontents{\vskip 0pt plus 1fil minus 1.5in}
@y
\def\botofcontents{\vskip 0pt plus 1fil minus 1.5in}
\let\maybe=\iffalse
\def\title{\TeX82 changes for Berkeley {\mc UNIX}}
\def\glob{13}\def\gglob{20, 26} % these are defined in module 1
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.2] banner line
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d banner=='This is TeX, Version 1.1' {printed when \TeX\ starts}
@y
@d banner=='This is TeX, Version 1.1 for Berkeley UNIX'
{printed when \TeX\ starts}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.4] program header
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
Actually the heading shown here is not quite normal: The |program| line
does not mention any |output| file, because \ph\ would ask the \TeX\ user
to specify a file name if |output| were specified here.
@^system dependencies@>
@d mtype==t@&y@&p@&e {this is a \.{WEB} coding trick:}
@y
@d mtype==t@&y@&p@&e {this is a \.{WEB} coding trick:}
@d standard_input==i@&n@&p@&u@&t {and another}
@z
@x
program TEX; {all file names are defined dynamically}
@y
program TEX(standard_input,output); {other file names are defined dynamically}
@z
@x
var @<Global variables@>@/
@y
var @<Globals variables@>@/
@#
@\@=#include "ext.h"@>@\ {declarations for external C procedures}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.7] debug..gubed, stat..tats
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d debug==@{ {change this to `$\\{debug}\equiv\null$' when debugging}
@d gubed==@t@>@} {change this to `$\\{gubed}\equiv\null$' when debugging}
@y
@d debug==
@d gubed==
@z
@x
@d stat==@{ {change this to `$\\{stat}\equiv\null$' when gathering
usage statistics}
@d tats==@t@>@} {change this to `$\\{tats}\equiv\null$' when gathering
usage statistics}
@y
@d stat==
@d tats==
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.8] init..tini
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d init== {change this to `$\\{init}\equiv\.{@@\{}$' in the production version}
@d tini== {change this to `$\\{tini}\equiv\.{@@\}}$' in the production version}
@y
@d init==
@d tini==
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.9] compiler directives
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@{@&$C-,A+,D-@} {no range check, catch arithmetic overflow, no debug overhead}
@!debug @{@&$C+,D+@}@+ gubed {but turn everything on when debugging}
@y
@=(*$C-*)@> {no range check}
@!debug @=(*$C+*)@> @+ gubed {but turn everything on when debugging}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.11] compile-time constants, use logical names
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@!mem_max=30000; {greatest index in \TeX's internal |mem| array;
must be strictly less than |max_halfword|}
@!buf_size=500; {maximum number of characters simultaneously present in
current lines of open files and in control sequences between
\.{\\csname} and \.{\\endcsname}; must not exceed |max_halfword|}
@!error_line=72; {width of context lines on terminal error messages}
@!half_error_line=42; {width of first lines of contexts in terminal
error messages; should be between 30 and |error_line-15|}
@!max_print_line=79; {width of longest text lines output; should be at least 60}
@!stack_size=200; {maximum number of simultaneous input sources}
@!max_in_open=6; {maximum number of input files and error insertions that
can be going on simultaneously}
@!font_max=75; {maximum internal font number; must not exceed |max_quarterword|
and must be at most |font_base+256|}
@!font_mem_size=20000; {number of words of |font_info| for all fonts}
@!param_size=60; {maximum number of simultaneous macro parameters}
@!nest_size=40; {maximum number of semantic levels simultaneously active}
@!max_strings=3000; {maximum number of strings; must not exceed |max_halfword|}
@!string_vacancies=8000; {the minimum number of characters that should be
available for the user's control sequences and font names,
after \TeX's own error messages are stored}
@!pool_size=32000; {maximum number of characters in strings, including all
error messages and help texts, and the names of all fonts and
control sequences; must exceed |string_vacancies| by the total
length of \TeX's own strings, which is currently about 23000}
@!save_size=600; {space for saving values outside of current group; must be
at most |max_halfword|}
@!trie_size=8000; {space for hyphenation patterns; should be larger for
\.{INITEX} than it is in production versions of \TeX}
@!dvi_buf_size=800; {size of the output buffer; must be a multiple of 8}
@!file_name_size=40; {file names shouldn't be longer than this}
@!pool_name='TeXformats:TEX.POOL ';
{string of length |file_name_size|; tells where the string pool appears}
@y
@!mem_max=30000; {greatest index in \TeX's internal |mem| array;
must be strictly less than |max_halfword|}
@!buf_size=500; {maximum number of characters simultaneously present in
current lines of open files and in control sequences between
\.{\\csname} and \.{\\endcsname}; must not exceed |max_halfword|}
@!error_line=79; {width of context lines on terminal error messages}
@!half_error_line=50; {width of first lines of contexts in terminal
error messages; should be between 30 and |error_line-15|}
@!max_print_line=79; {width of longest text lines output; should be at least 60}
@!stack_size=200; {maximum number of simultaneous input sources}
@!max_in_open=15; {maximum number of input files and error insertions that
can be going on simultaneously}
@!font_max=100; {maximum internal font number; must not exceed |max_quarterword|
and must be at most |font_base+256|}
@!font_mem_size=25000; {number of words of |font_info| for all fonts}
@!param_size=60; {maximum number of simultaneous macro parameters}
@!nest_size=40; {maximum number of semantic levels simultaneously active}
@!max_strings=4400; {maximum number of strings; must not exceed |max_halfword|}
@!string_vacancies=15000; {the minimum number of characters that should be
available for the user's control sequences and font names,
after \TeX's own error messages are stored}
@!pool_size=45000; {maximum number of characters in strings, including all
error messages and help texts, and the names of all fonts and
control sequences; must exceed |string_vacancies| by the total
length of \TeX's own strings, which is currently about 23000}
@!save_size=600; {space for saving values outside of current group; must be
at most |max_halfword|}
@!trie_size=8000; {space for hyphenation patterns; should be larger for
\.{INITEX} than it is in production versions of \TeX}
@!dvi_buf_size=800; {size of the output buffer; must be a multiple of 8}
@!file_name_size=1024; {file names shouldn't be longer than this}
@!pool_name='tex.pool';
{string of length |file_name_size|; the string pool name}
@.TeXformats@>
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [1.12] sensitive compile-time constants
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d mem_base=0 {smallest index in the |mem| array; must not be less
than |min_halfword|}
@d hi_mem_base=13000 {smallest index in the single-word area of |mem|;
must be substantially larger than |mem_base| and smaller than |mem_max|}
@d font_base=0 {smallest internal font number; must not be less
than |min_quarterword|}
@d hash_size=2100 {maximum number of control sequences; it should be at most
about |(mem_max-hi_mem_base)/6|, but 2100 is already quite generous}
@d hash_prime=1777 {a prime number equal to about 85\% of |hash_size|}
@d hyph_size=307 {another prime; the number of \.{\\hyphenation} exceptions}
@y
@d mem_base=-30000 {smallest index in the |mem| array; must not be less
than |min_halfword|}
@d hi_mem_base=-5000 {smallest index in the single-word area of |mem|;
must be substantially larger than |mem_base| and smaller than |mem_max|}
@d font_base=0 {smallest internal font number; must not be less
than |min_quarterword|}
@d hash_size=3000 {maximum number of control sequences; it should be at most
about |(mem_max-hi_mem_base)/6|, but 3000 is already quite generous}
@d hash_prime=2551 {a prime number equal to about 85\%\ of |hash_size|}
@d hyph_size=307 {another prime; the number of \.{\\hyphenation} exceptions}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [2.23] form-feed and tab are legal characters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@^character set dependencies@>
@^system dependencies@>
@<Set init...@>=
for i:=1 to @'37 do xchr[i]:=' ';
@y
@^character set dependencies@>
@^system dependencies@>
The code shown here is intended to be used on systems
where only the printable ascii set, along with
|carriage_return|, |tab|, and |form_feed| will show up in text files.
All |null| characters are skipped.
Another modification made by Scott Jones at MIT-PREP. I don't know how to
make mods correctly so I just deleted the previous change and replaced
it with my change which allows control characters to be accepted at MIT.
@<Set initial values...@>=
for i:=1 to @'37 do xchr[i]:=chr(i);
@z
@x
for i:=first_text_char to last_text_char do xord[chr(i)]:=invalid_code;
@y
for i:=first_text_char to last_text_char do xord[chr(i)]:=invalid_code;
xord[xchr[null_code]]:=null_code;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.25] file types
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
The program actually makes use also of a third kind of file, called a
@y
The pc compiler on Berkeley {\mc UNIX} won't pack a range into one byte unless
the lower bound is |-128| or more, and the upper bound is |127| or less.
This applies to files, too. To make the program work with compiler range
checking turned on, we'll have to adjust |eight_bits| codes by sometimes
adding or subtracting |256|.
Note that |eight_bits| really takes 16 bits here.
The program actually makes use also of a third kind of file, called a
@z
@x
@!alpha_file=packed file of text_char; {files that contain textual data}
@!byte_file=packed file of eight_bits; {files that contain binary data}
@y
@!alpha_file=t@&e@&x@&t; {files that contain textual data}
@!byte_file=packed file of -128..127; {files that contain binary data}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.23] add real_name_of_file array
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
is crucial for our purposes. We shall assume that |name_of_file| is a variable
of an appropriate type such that the \PASCAL\ run-time system being used to
implement \TeX\ can open a file whose external name is specified by
|name_of_file|.
@^system dependencies@>
@<Glob...@>=
@!name_of_file:packed array[1..file_name_size] of char;@;@/
{on some systems this may be a \&{record} variable}
@!name_length:0..file_name_size;@/{this many characters are actually
relevant in |name_of_file| (the rest are blank)}
@y
is crucial for our purposes. We shall assume that |name_of_file| is a variable
of an appropriate type such that the \PASCAL\ run-time system being used to
implement \TeX\ can open a file whose external name is specified by
|name_of_file|.
The Berkeley {\mc UNIX} version uses search paths to look for files to open.
We use |real_name_of_file| to hold the |name_of_file| with a directory
name from the path in front of it.
@^system dependencies@>
@<Glob...@>=
@!name_of_file,@!real_name_of_file:packed array[1..file_name_size] of char;
@;@/
@!name_length:0..file_name_size;@/{this many characters are actually
relevant in |name_of_file| (the rest are blank)}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.27] file opening
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ The \ph\ compiler with which the present version of \TeX\ was prepared has
extended the rules of \PASCAL\ in a very convenient way. To open file~|f|,
we can write
$$\vbox{\halign{#\hfil\qquad&#\hfil\cr
|reset(f,@t\\{name}@>,'/O')|&for input;\cr
|rewrite(f,@t\\{name}@>,'/O')|&for output.\cr}}$$
The `\\{name}' parameter, which is of type `\ignorespaces|packed
array[@t\<\\{any}>@>] of text_char|', stands for the name of
the external file that is being opened for input or output.
Blank spaces that might appear in \\{name} are ignored.
The `\.{/O}' parameter tells the operating system not to issue its own
error messages if something goes wrong. If a file of the specified name
cannot be found, or if such a file cannot be opened for some other reason
(e.g., someone may already be trying to write the same file), we will have
|@!erstat(f)<>0| after an unsuccessful |reset| or |rewrite|. This allows
\TeX\ to undertake appropriate corrective action.
@:PASCAL H}{\ph@>
@^system dependencies@>
\TeX's file-opening procedures return |false| if no file identified by
|name_of_file| could be opened.
@d reset_OK(#)==erstat(#)=0
@d rewrite_OK(#)==erstat(#)=0
@p function a_open_in(var f:alpha_file):boolean;
{open a text file for input}
begin reset(f,name_of_file,'/O'); a_open_in:=reset_OK(f);
end;
@#
function a_open_out(var f:alpha_file):boolean;
{open a text file for output}
begin rewrite(f,name_of_file,'/O'); a_open_out:=rewrite_OK(f);
end;
@#
function b_open_in(var f:byte_file):boolean;
{open a binary file for input}
begin reset(f,name_of_file,'/O'); b_open_in:=reset_OK(f);
end;
@#
function b_open_out(var f:byte_file):boolean;
{open a binary file for output}
begin rewrite(f,name_of_file,'/O'); b_open_out:=rewrite_OK(f);
end;
@#
function w_open_in(var f:word_file):boolean;
{open a word file for input}
begin reset(f,name_of_file,'/O'); w_open_in:=reset_OK(f);
end;
@#
function w_open_out(var f:word_file):boolean;
{open a word file for output}
begin rewrite(f,name_of_file,'/O'); w_open_out:=rewrite_OK(f);
end;
@y
@ The \ph\ compiler with which the present version of \TeX\ was prepared has
extended the rules of \PASCAL\ in a very convenient way for file opening.
Berkeley {\mc UNIX} \PASCAL\ isn't nearly as nice as \ph.
Normally, it bombs out if a file open fails.
An external C procedure, |test_access| is used to check whether or not the
open will work. It is declared in the ``ext.h'' include file, and it returns
|true| or |false|. The |name_of_file| global holds the file name whose access
is to be tested.
The first parameter for |test_access| is the access mode,
one of |read_access_mode| or |write_access_mode|.
We also implement path searching in |test_access|: its second parameter is
one of the ``file path'' constants defined below. If |name_of_file|
doesn't start with |'/'| then |test_access| tries prepending pathnames
from the appropriate path list until success or the end of path list
is reached.
On return, |real_name_of_file| contains the original name with the path
that succeeded (if any) prepended. It is the name used in the various
open procedures.
Note that |a_open_in| has been redefined to take an additional argument,
which should be one of the ``file path'' specifiers.
Since |b_open_in| is only used for \.{TFM} files, and
|w_open_in| is only used for format files, we don't need a path specifying
argument for them.
Path searching is not done for output files.
@d read_access_mode=4 {``read'' mode for |test_access|}
@d write_access_mode=2 {``write'' mode for |test_access|}
@d no_file_path=0 {no path searching should be done}
@d input_file_path=1 {path specifier for \.{\\input} files}
@d read_file_path=2 {path specifier for \.{\\read} files}
@d font_file_path=3 {path specifier for \.{TFM} files}
@d format_file_path=4 {path specifier for format files}
@d pool_file_path=5 {path specifier for the pool file}
@p function a_open_in(var f:alpha_file;@!path_specifier:integer):boolean;
{open a text file for input}
var @!ok:boolean;
begin
if test_access(read_access_mode,path_specifier) then
begin reset(f,real_name_of_file); ok:=true@+end
else
ok:=false;
a_open_in:=ok;
end;
@#
function a_open_out(var f:alpha_file):boolean;
{open a text file for output}
var @!ok:boolean;
begin
if test_access(write_access_mode,no_file_path) then
begin rewrite(f,real_name_of_file); ok:=true @+end
else ok:=false;
a_open_out:=ok;
end;
@#
function b_open_in(var f:byte_file):boolean;
{open a binary file for input}
var @!ok:boolean;
begin
if test_access(read_access_mode,font_file_path) then
begin reset(f,real_name_of_file); ok:=true @+end
else ok:=false;
b_open_in:=ok;
end;
@#
function b_open_out(var f:byte_file):boolean;
{open a binary file for output}
var @!ok:boolean;
begin
if test_access(write_access_mode,no_file_path) then
begin rewrite(f,real_name_of_file); ok:=true @+end
else ok:=false;
b_open_out:=ok;
end;
@#
function w_open_in(var f:word_file):boolean;
{open a word file for input}
var @!ok:boolean;
begin
if test_access(read_access_mode,format_file_path) then
begin reset(f,real_name_of_file); ok:=true @+end
else ok:=false;
w_open_in:=ok;
end;
@#
function w_open_out(var f:word_file):boolean;
{open a word file for output}
var @!ok:boolean;
begin
if test_access(write_access_mode,no_file_path) then
begin rewrite(f,name_of_file); ok:=true @+end
else ok:=false;
w_open_out:=ok;
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.28] file closing
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
This makes |f| available to be opened again, if desired; and if |f| was used for
output, the |close| operation makes the corresponding external file appear
on the user's area, ready to be read.
These procedures should not generate error messages if a file is
being closed before it has been successfully opened.
@p procedure a_close(var f:alpha_file); {close a text file}
begin close(f);
end;
@#
procedure b_close(var f:byte_file); {close a binary file}
begin close(f);
end;
@#
procedure w_close(var f:word_file); {close a word file}
begin close(f);
end;
@y
This makes |f| available to be opened again, if desired; and if |f| was used for
output, the |close| operation makes the corresponding external file appear
on the user's area, ready to be read.
With the pc library, files will be automatically closed when the program stops
and when one reopens them.
There is however, the problem of opening a file and writing it, and then
wanting to read it again, but from a different file variable.
For this purpose we use external procedures |close_a|, |close_b|, and
|close_w|.
There should be an ``include'' statement above, to declare these external
procedures.
@p procedure a_close(var f:alpha_file); {close a text file}
begin close_a(f);
end;
@#
procedure b_close(var f:byte_file); {close a binary file}
begin close_b(f);
end;
@#
procedure w_close(var f:word_file); {close a word file}
begin close_w(f);
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.31] faster version of input_ln
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
Since the inner loop of |input_ln| is part of \TeX's ``inner loop''---each
character of input comes in at this place---it is wise to reduce system
overhead by making use of special routines that read in an entire array
of characters at once, if such routines are available. The following
code uses standard \PASCAL\ to illustrate what needs to be done, but
finer tuning is often possible at well-developed \PASCAL\ sites.
@^inner loop@>
@p function input_ln(var f:alpha_file;@!bypass_eoln:boolean):boolean;
{inputs the next line or returns |false|}
var last_nonblank:0..buf_size; {|last| with trailing blanks removed}
begin if bypass_eoln then if not eof(f) then get(f);
{input the first character of the line into |f^|}
last:=first; {cf.\ Matthew 19:30}
if eof(f) then input_ln:=false
else begin last_nonblank:=first;
while not eoln(f) do
begin if last>=max_buf_stack then
begin max_buf_stack:=last+1;
if max_buf_stack=buf_size then
overflow("buffer size",buf_size);
@:TeX capacity exceeded buffer size}{\quad buffer size@>
end;
buffer[last]:=xord[f^]; get(f); incr(last);
if buffer[last-1]<>" " then last_nonblank:=last;
end;
last:=last_nonblank; input_ln:=true;
end;
end;
@y
Since the inner loop of |input_ln| is part of \TeX's ``inner loop''---each
character of input comes in at this place---it is wise to reduce system
overhead by making use of special routines that read in an entire array
of characters at once.
With Berkeley {\mc UNIX} we call an external C procedure, |line_read|.
That routine fills |buffer| from |first| onwards with the |xord|'ed values
of the next line, setting |last| appropriately. It will stop if
|last=buf_size|, and the following will cause an ``overflow'' abort.
We ignore the |bypass_eoln| argument, since the |line_read| procedure
will have handled bypassing the end-of-line in its previous call, if
there was one.
If one uses |input_ln| on a file, the normal |read|
and |get| routines shouldn't be used, nor the |eof| and |eoln| tests.
End of file can be tested with the external function |test_eof|.
@^inner loop@>
@p function input_ln(var f:alpha_file;@!bypass_eoln:boolean):boolean;
{inputs the next line or returns |false|}
label done;
begin
last:=first; {cf.\ Matthew 19:30}
if test_eof(f) then input_ln:=false
else begin last:=first;
line_read(f,buf_size);
if last>=max_buf_stack then begin
max_buf_stack:=last+1;
if max_buf_stack>=buf_size then
overflow("buffer size",buf_size);
@:TeX capacity exceeded buffer size}{\quad buffer size@>
end;
loop@+ begin if last=first then goto done;
if buffer[last-1]<>" " then goto done;
decr(last);
end;
done: input_ln:=true;
end;
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.32] term_in/out are input,output
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ The user's terminal acts essentially like other files of text, except
that it is used both for input and for output. When the terminal is
considered an input file, the file variable is called |term_in|, and when it
is considered an output file the file variable is |term_out|.
@^system dependencies@>
@<Glob...@>=
@!term_in:alpha_file; {the terminal as an input file}
@!term_out:alpha_file; {the terminal as an output file}
@y
@ The user's terminal acts essentially like other files of text, except
that it is used both for input and for output. When the terminal is
considered an input file, the file is called |term_in|, and when it
is considered an output file the file is |term_out|.
For Berkeley {\mc UNIX} we use |standard_input| and |output| for these
files, as were declared in the program header. The former name
|standard_input| was defined using a web trick so that ``input'' is
produced in the Pascal file.
@d term_in==standard_input {the terminal as an input file}
@d term_out==output {the terminal as an output file}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.33] don't need to open terminal files
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ Here is how to open the terminal files
in \ph. The `\.{/I}' switch suppresses the first |get|.
@^system dependencies@>
@d t_open_in==reset(term_in,'TTY:','/O/I') {open the terminal for text input}
@d t_open_out==rewrite(term_out,'TTY:','/O') {open the terminal for text output}
@y
@ Here is how to open the terminal files
---do nothing.
@d t_open_in == {input already open for text input}
@d t_open_out == {output already open for text output}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.34] flushing output
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
these operations can be specified in \ph:
@^system dependencies@>
@d update_terminal == break(term_out) {empty the terminal output buffer}
@d clear_terminal == break_in(term_in,true) {clear the terminal input buffer}
@d wake_up_terminal == do_nothing {cancel the user's cancellation of output}
@y
these operations can be specified with Berkeley {\mc UNIX}.
@^system dependencies@>
@d update_terminal == flush(output)
@d clear_terminal == {nothing necessary on UNIX}
@d wake_up_terminal == {nothing necessary on UNIX}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [3.37] rescanning the command line
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ The following program does the required initialization
without retrieving a possible command line.
It should be clear how to modify this routine to deal with command lines,
if the system permits them.
@^system dependencies@>
@p function init_terminal:boolean; {gets the terminal input started}
label exit;
begin t_open_in;
loop@+begin wake_up_terminal; write(term_out,'**'); update_terminal;
@.**@>
if not input_ln(term_in,true) then {this shouldn't happen}
begin write_ln(term_out);
write(term_out,'! End of file on the terminal... why?');
@.End of file on the terminal@>
init_terminal:=false; return;
end;
loc:=first;
while (loc<last)and(buffer[loc]=" ") do incr(loc);
if loc<last then
begin init_terminal:=true;
return; {return unless the line was all blank}
end;
write_ln(term_out,'Please type the name of your input file.');
end;
exit:end;
@y
@ The following program does the required initialization
and also retrieves a possible command line.
@^system dependencies@>
@p
function init_terminal:boolean; {gets the terminal input started}
label exit;
var
i, j : integer;
arg : packed array[1..100] of char;
begin
t_open_in;
if argc > 1 then begin
last := first;
for i := 1 to argc - 1 do begin
argv(i, arg);
j := 1;
while (j <= 100) and (arg[j] <> ' ') do begin
buffer[last] := xord[arg[j]];
incr(j); incr(last);
end;
if j > 1 then begin
buffer[last] := xord[' '];
incr(last);
end;
end;
if last > first then begin
loc := first;
init_terminal := true;
return;
end;
end;
loop@+begin
wake_up_terminal; write(term_out, '**'); update_terminal;
@.**@>
if not input_ln(term_in,true) then begin {this shouldn't happen}
write_ln(term_out);
write(term_out, '! End of file on the terminal... why?');
@.End of file on the terminal@>
init_terminal:=false;
return;
end;
loc:=first;
while (loc<last)and(buffer[loc]=" ") do
incr(loc);
if loc<last then begin
init_terminal:=true;
return; {return unless the line was all blank}
end;
write_ln(term_out, 'Please type the name of your input file.');
end;
exit:
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [4.51] a_open_in of pool file needs path specifier
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
if a_open_in(pool_file) then
@y
if a_open_in(pool_file,pool_file_path) then
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [4.51,52,53] make TEX.POOL lowercase in messages
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
else bad_pool('! I can''t read TEX.POOL.')
@y
else bad_pool('! I can''t read tex.pool.')
@z
@x
begin if eof(pool_file) then bad_pool('! TEX.POOL has no check sum.');
@y
begin if eof(pool_file) then bad_pool('! tex.pool has no check sum.');
@z
@x
bad_pool('! TEX.POOL line doesn''t begin with two digits.');
@y
bad_pool('! tex.pool line doesn''t begin with two digits.');
@z
@x
bad_pool('! TEX.POOL check sum doesn''t have nine digits.');
@y
bad_pool('! tex.pool check sum doesn''t have nine digits.');
@z
@x
done: if a<>@$ then bad_pool('! TEX.POOL doesn''t match; TANGLE me again.');
@y
done: if a<>@$ then bad_pool('! tex.pool doesn''t match; tangle me again.');
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [6.84] switch-to-editor option
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
line ready to be edited. But such an extension requires some system
wizardry, so the present implementation simply types out what file should be
edited and the relevant line number.
@^system dependencies@>
There is a secret `\.D' option available when the debugging routines have
not been commented out.
@^debugging@>
@y
line ready to be edited.
We do this by calling the external procedure |calledit| with a pointer to
the filename, its length, and the line number.
However, here we just set up the variables that will be used as arguments,
since we don't want to do the switch-to-editor until after TeX has closed
its files.
@^system dependencies@>
There is a secret `\.D' option available when the debugging routines have
not been commented out.
@^debugging@>
@d edit_file==input_stack[base_ptr]
@z
@x
"E": if base_ptr>0 then
begin print_nl("You want to edit file ");
@.You want to edit file x@>
print(input_stack[base_ptr].name_field);
print(" at line "); print_int(line);
interaction:=scroll_mode; jump_out;
@y
"E": if base_ptr>0 then
begin
edit_name_start:=str_start[edit_file.name_field];
edit_name_length:=str_start[edit_file.name_field+1] -
str_start[edit_file.name_field];
edit_line:=line;
jump_out;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [7.109] glue_ratio
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
routines cited there must be modified to allow negative glue ratios.)
@^system dependencies@>
@d set_glue_ratio_zero(#) == #:=0.0 {store the representation of zero ratio}
@d set_glue_ratio_one(#) == #:=1.0 {store the representation of unit ratio}
@d float(#) == # {convert from |glue_ratio| to type |real|}
@d unfloat(#) == # {convert from |real| to type |glue_ratio|}
@d float_constant(#) == #.0 {convert |integer| constant to |real|}
@<Types...@>=
@!glue_ratio=real; {one-word representation of a glue expansion factor}
@y
routines cited there must be modified to allow negative glue ratios.)
The Berkeley {\mc UNIX} pc compiler won't let us use reals of less than eight
bytes. We will pretend that a |glue_ratio| is an |integer|, but we will
really store |short_real|'s in them. This will be accomplished by using
external C procedures to store into and retrieve from |glue_ratio|'s.
The source uses macros |unfloat| and |float| for these purposes. We need
to change the word ``float'' before it is written out, because that is a
reserved word in C.
@^system dependencies@>
@d float(#)==tofloat(#)
@d set_glue_ratio_zero(#)==#:=unfloat(0.0)
@d set_glue_ratio_one(#)==#:=unfloat(1.0)
@d float_constant(#) == #.0 {convert |integer| constant to |real|}
@<Types...@>=
@!glue_ratio = integer; {one-word representation of a glue expansion factor}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [8.110] ranges for quarter,half words
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
if the subrange is `|-128..127|'.
The present implementation tries to accommodate as many variations as possible,
so it makes rather general assumptions. If integers having the subrange
`|min_quarterword..max_quarterword|' can be packed into a quarterword,
and if integers having the subrange `|min_halfword..max_halfword|'
can be packed into a halfword, everything should work satisfactorily.
It is usually most efficient to have |min_quarterword=min_halfword=0|,
so one should try to achieve this unless it causes a severe problem.
The values defined here are recommended for most 32-bit computers.
@d min_quarterword=0 {smallest allowable value in a |quarterword|}
@d max_quarterword=255 {largest allowable value in a |quarterword|}
@d min_halfword==0 {smallest allowable value in a |halfword|}
@d max_halfword==65535 {largest allowable value in a |halfword|}
@y
if the subrange is `|-128..127|'.
For Berkeley {\mc UNIX} we need to do the |-128..127| kind of range.
@d min_quarterword=-128 {smallest allowable value in a |quarterword|}
@d max_quarterword=127 {largest allowable value in a |quarterword|}
@d min_halfword==-32768 {smallest allowable value in a |halfword|}
@d max_halfword==32767 {largest allowable value in a |halfword|}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [11.165] fix the word "free" so that it doesn't conflict with a runtime proc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
and decreasing |hi_mem_base| saves time.)
@y
and decreasing |hi_mem_base| saves time.)
@d free==free_arr
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [12.186] glue_ratio fix
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
floating point underflow on the author's computer.
@^system dependencies@>
@^dirty \PASCAL@>
@<Display the value of |glue_set(p)|@>=
g:=float(glue_set(p));
if (g<>0.0)and(glue_sign(p)<>normal) then
begin print(", glue set ");
if glue_sign(p)=shrinking then print("- ");
if abs(mem[p+glue_offset].int)<@'4000000 then print("?.?")
else if abs(g)>20000.0 then
begin if g>0.0 then print_char(">")
else print("< -");
print_glue(20000*unity,glue_order(p),0);
end
else print_glue(round(unity*g),glue_order(p),0);
@^real multiplication@>
end
@y
floating point underflow on the author's computer.
For the {\mc VAX}, the only possible random value that could hurt is
a reserved value with 1 in the sign bit and 0 for the (excess) exponent.
Because the sign-plus-exponent is in the middle of the word, the chances
of this happening are miniscule, and ignored here.
@^system dependencies@>
@^dirty \PASCAL@>
@<Display the value of |glue_set(p)|@>=
g:=float(glue_set(p));
if (g<>0.0)and(glue_sign(p)<>normal) then
begin print(", glue set ");
if glue_sign(p)=shrinking then print("- ");
if abs(float(glue_set(p)))>20000.0 then
begin if float(glue_set(p))>0 then print_char(">")
else print("< -");
print_glue(20000*unity,glue_order(p),0);
end
else print_glue(round(float(glue_set(p))*unity),glue_order(p),0);
@^real multiplication@>
end
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [17.241] fix_date_and_time
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ The following procedure, which is called just before \TeX\ initializes its
input and output, establishes the initial values of the date and time.
@^system dependencies@>
Since standard \PASCAL\ cannot provide such information, something special
is needed. The program here simply specifies July 4, 1776, at noon; but
users probably want a better approximation to the truth.
@p procedure fix_date_and_time;
begin time:=12*60; {minutes since midnight}
day:=4; {fourth day of the month}
month:=7; {seventh month of the year}
year:=1776; {Anno Domini}
end;
@y
@ The following procedure, which is called just before \TeX\ initializes its
input and output, establishes the initial values of the date and time.
It is calls an externally defined |date_and_time|, even though it could
be done from Pascal.
The external procedure also sets up interrupt catching.
@^system dependencies@>
@p procedure fix_date_and_time;
begin
date_and_time(time,day,month,year);
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.513] area and extension rules
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ The file names we shall deal with for illustrative purposes have the
following structure: If the name contains `\.>' or `\.:', the file area
consists of all characters up to and including the final such character;
otherwise the file area is null. If the remaining file name contains
`\..', the file extension consists of all such characters from the first
remaining `\..' to the end, otherwise the file extension is null.
@^system dependencies@>
We can scan such file names easily by using two global variables that keep track
of the occurrences of area and extension delimiters:
@<Glob...@>=
@!area_delimiter:pool_pointer; {the most recent `\.>' or `\.:', if any}
@!ext_delimiter:pool_pointer; {the relevant `\..', if any}
@y
@ The file names we shall deal with for illustrative purposes have the
following structure: If the name contains `\./', the file area
consists of all characters up to and including the final such character;
otherwise the file area is null. If the remaining file name contains
`\..', the file extension consists of all such characters from the first
remaining `\..' to the end, otherwise the file extension is null.
@^system dependencies@>
We can scan such file names easily by using two global variables that keep
track of the occurrences of area and extension delimiters:
@<Glob...@>=
@!area_delimiter:pool_pointer; {the most recent `\./', if any}
@!ext_delimiter:pool_pointer; {the most recent `\..', if any}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.514] TEX area directories
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d TEX_area=="TeXinputs:"
@.TeXinputs@>
@d TEX_font_area=="TeXfonts:"
@.TeXfonts@>
@y
Under Berkeley {\mc UNIX}, the default paths are specified in a seprate
file, ``texpaths.h''. The file opening procedures do path searching
based either on those default paths, or on paths given by the user
in ``environment'' variables.
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.516] more_name
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
else begin if (c=">")or(c=":") then
@y
else begin if (c="/") then
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.520] default format
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d format_default_length=20 {length of the |TEX_format_default| string}
@d format_area_length=11 {length of its area part}
@d format_ext_length=4 {length of its `\.{.fmt}' part}
@y
Under Berkeley {\mc UNIX} we don't give the area part, instead depending
on the path searching that will happen during file opening.
@d format_default_length=9 {length of the |TEX_format_default| string}
@d format_area_length=0 {length of its area part}
@d format_ext_length=4 {length of its `\.{.fmt}' part}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.521] plain format location
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
TEX_format_default:='TeXformats:PLAIN.fmt';
@y
TEX_format_default:='plain.fmt';
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.524] format file opening: only try once, with path search
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
pack_buffered_name(0,loc,j-1); {try first without the system file area}
if w_open_in(fmt_file) then
begin loc:=j; goto found;
end;@/
pack_buffered_name(format_area_length,loc,j-1);
{now try the system format file area}
if w_open_in(fmt_file) then
begin loc:=j; goto found;
end;
@y
pack_buffered_name(0,loc,j-1);
if w_open_in(fmt_file) then
begin loc:=j; goto found;
end;@/
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.525] make_name_string
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
which simply makes a \TeX\ string from the value of |name_of_file|, should
ideally be changed to deduce the full name of file~|f|, if it is
possible to do this in a \PASCAL\ program.
@^system dependencies@>
@p function make_name_string:str_number;
var k:1..file_name_size; {index into |name_of_file|}
begin str_room(name_length);
for k:=1 to name_length do append_char(xord[name_of_file[k]]);
make_name_string:=make_string;
end;
@y
which simply makes a \TeX\ string from the value of |name_of_file|, should
ideally be changed to deduce the full name of file~|f|, if it is
possible to do this in a \PASCAL\ program.
With the Berkeley {\mc UNIX} version, we know that |real_name_of_file|
contains |name_of_file| prepended with the directory name that was found
by path searching.
If |real_name_of_file| starts with |'./'|, we don't use that part of the
name, since {\mc UNIX} users understand that.
@^system dependencies@>
@p function make_name_string:str_number;
var k,@!kstart:1..file_name_size; {index into |name_of_file|}
begin
k:=1;
while (k<file_name_size) and (xord[real_name_of_file[k]]<>" ") do
incr(k);
name_length:=k-1; {the real |name_length|}
str_room(name_length);
if (xord[real_name_of_file[1]]=".") and (xord[real_name_of_file[2]]="/") then
kstart:=3
else
kstart:=1;
for k:=kstart to name_length do append_char(xord[real_name_of_file[k]]);
make_name_string:=make_string;
end;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.537] a_open_in of \input file needs path selector
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
if a_open_in(cur_file) then goto done;
pack_file_name(cur_name,TEX_area,cur_ext);
if a_open_in(cur_file) then goto done;
@y
if a_open_in(cur_file,input_file_path) then goto done;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29.537] get rid of return of name to string pool
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
if name=str_ptr-1 then {we can conserve string pool space now}
begin flush_string; name:=cur_name;
end;
@y
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [30.563] opening tfm file: now path searching is done
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Set temp_int to value of first byte
@x
@ @<Open |tfm_file| for input@>=
file_opened:=false;
if aire="" then pack_file_name(nom,TEX_font_area,".tfm")
else pack_file_name(nom,aire,".tfm");
if not b_open_in(tfm_file) then abort;
file_opened:=true
@y
@ @<Open |tfm_file| for input@>=
file_opened:=false;
pack_file_name(nom,aire,".tfm");
if not b_open_in(tfm_file) then abort;
begin temp_int:=tfm_file^;
if temp_int<0 then temp_int:=temp_int+256;
end;
file_opened:=true
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [30.564] reading the tfm file
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d fget==get(tfm_file)
@d fbyte==tfm_file^
@y
For Berkeley {\mc UNIX} we had to make the |byte_file| type have data in the
range |-128..127|.
If the file byte contains |@'377|, we want to regard this as 255 in decimal.
However if we do |i:=tfm_file^| on that byte, where i is a signed integer,
then the result is |i=-1|.
File bytes with values |<@'200| are read properly.
The solution is to do the assignment as shown, and then add 256 to values
less than 0.
We could also assign to |eight_bits| values, but this causes an error if
runtime checking is turned on.
The integer |temp_int| will be added to global variables at the end,
where it won't disturb module numbering.
@d fget==begin get(tfm_file);
temp_int:=tfm_file^;
if temp_int<0 then temp_int:=temp_int+256;
end
@d fbyte==temp_int
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [32.597] write_dvi
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p procedure write_dvi(@!a,@!b:dvi_index);
var k:dvi_index;
begin for k:=a to b do write(dvi_file,dvi_buf[k]);
end;
@y
For Berkeley {\mc UNIX}, this is going to be handled by an external procedure,
|writedvi|, which will do the output using |fwrite|.
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [49.1275] a_open_in of \read file needs path specifier
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
if a_open_in(read_file[n]) then read_open[n]:=just_open;
@y
if a_open_in(read_file[n],read_file_path) then read_open[n]:=just_open;
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [51.1332] Add call to exit() depending upon value of `history'
% Also, add call to set_paths
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ Now this is really it: \TeX\ starts and ends here.
The initial test involving |ready_already| should be deleted if the
\PASCAL\ runtime system is smart enough to detect such a ``mistake.''
@y
@ Now this is really it: \TeX\ starts and ends here.
Use the value of |history| to determine what exit-code to use. We use
1 if |history <> spotless| and 0 otherwise.
@d UNIXexit==e@&x@&i@&t
@z
@x
t_open_out; {open the terminal for output}
@y
t_open_out; {open the terminal for output}
set_paths;
@z
@x
final_end: ready_already:=0;
@y
final_end: ready_already:=0;
if (history <> spotless) and (history <> warning_issued) then
UNIXexit(1)
else
UNIXexit(0);
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [51.1333] print new line before termination; switch to editor if nec.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
print(log_name); print_char(".");
end;
end;
@y
print(log_name); print_char(".");
end;
end;
print_ln;
if (edit_name_start<>0) and (interaction>batch_mode) then
calledit(str_pool[edit_name_start],edit_name_length,edit_line);
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [54.1376] add temp_int and editor-switch variables to globals
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@* \[54] System-dependent changes.
This section should be replaced, if necessary, by changes to the program
that are necessary to make \TeX\ work at a particular installation.
It is usually best to design your change file so that all changes to
previous sections preserve the section numbering; then everybody's version
will be consistent with the published program. More extensive changes,
which introduce new sections, can be inserted here; then only the index
itself will get a new section number.
@^system dependencies@>
@y
@* \[54] System-dependent changes.
Here is a temporary integer, used as a holder during reading and writing of
TFM files.
Also, the variables used to hold ``switch-to-editor'' information.
@^system dependencies@>
@<Globals...@>=
@!temp_int:integer;
@!edit_name_start: pool_pointer;
@!edit_name_length,@!edit_line: integer;
@ The |edit_name_start| will be set to point into |str_pool| somewhere after
its beginning if \TeX\ is supposed to switch to an editor on exit.
@<Set init...@>=
edit_name_start:=0;
@z
--------------------------- diff-dist-initex.ch ---------------------------
*** dist_initex.ch Mon Aug 6 01:09:56 1984
--- initex.ch Tue Jul 16 23:50:10 1985
***************
*** 264,270
The code shown here is intended to be used on systems
where only the printable ascii set, along with
|carriage_return|, |tab|, and |form_feed| will show up in text files.
! All |null| characters are skipped.
@d form_feed=@'14 {ascii code used at end of a page}
@d tab=@'11
--- 264,270 -----
The code shown here is intended to be used on systems
where only the printable ascii set, along with
|carriage_return|, |tab|, and |form_feed| will show up in text files.
! All |null| characters are skipped.
Another modification made by Scott Jones at MIT-PREP. I don't know how to
make mods correctly so I just deleted the previous change and replaced
***************
*** 266,273
|carriage_return|, |tab|, and |form_feed| will show up in text files.
All |null| characters are skipped.
! @d form_feed=@'14 {ascii code used at end of a page}
! @d tab=@'11
@<Set initial values...@>=
for i:=1 to @'37 do xchr[i]:=' ';
--- 266,274 -----
|carriage_return|, |tab|, and |form_feed| will show up in text files.
All |null| characters are skipped.
! Another modification made by Scott Jones at MIT-PREP. I don't know how to
! make mods correctly so I just deleted the previous change and replaced
! it with my change which allows control characters to be accepted at MIT.
@<Set initial values...@>=
for i:=1 to @'37 do xchr[i]:=chr(i);
***************
*** 270,279
@d tab=@'11
@<Set initial values...@>=
! for i:=1 to @'37 do xchr[i]:=' ';
! xchr[form_feed]:=chr(form_feed);
! xchr[tab]:=chr(tab);
! xchr[null_code]:=chr(null_code);
@z
@x
--- 271,277 -----
it with my change which allows control characters to be accepted at MIT.
@<Set initial values...@>=
! for i:=1 to @'37 do xchr[i]:=chr(i);
@z
@x
----------------------------------- EOF -----------------------------------chris@umcp-cs.UUCP (Chris Torek) (08/13/85)
Instead of forcing every TeX installation to allow control characters, would it not be simpler to take them out of the Gnumacs manual? There were (at last count) two whole occurrences of control-F, and that was all. Surely it's not so important that the Gnu manual use ^F rather than some \ sequence. -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251) UUCP: seismo!umcp-cs!chris CSNet: chris@umcp-cs ARPA: chris@maryland