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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /support/emacs-modes/weave.ch
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+% Change file for the WEAVE processor, for use on Berkeley UNIX systems.
+% This file was created by Howard Trickey and Pavel Curtis.
+
+% History:
+% 11/29/82 HWT Original version. This modifies weave to allow a new
+% control sequence:
+% @=...text...@> Put ...text... verbatim on a line
+% by itself in the Pascal output.
+% (argument must fit on one line)
+% This control sequence facilitates putting #include "gcons.h"
+% (for example) in files meant for the pc compiler.
+% Also, there is a command line option, -c, which means that
+% only the modules affected by the change file are to generate
+% TeX output. (All the limbo stuff still goes to the output
+% file, as does the index and table of contents.)
+%
+% 2/12/83 HWT Brought up for use with version 1.3. Uses Knuth's new
+% control sequences for verbatim Pascal (as above, without
+% the "on one line" part), and the force_line (@\) primitive.
+% Also, he added stuff to keep track of changed modules, and
+% output enough information that macros can choose only to
+% print changed modules. This isn't as efficient as my
+% implementation because I avoided outputting the text for
+% non-changed modules altogether, but this feature won't be
+% used too often (just for TeX and TeXware), so Knuth's
+% solution is accepted.
+% The change file changes that used
+% to implement these features have been removed.
+% There is a -x flag to cause WEAVE to omit cross referencing
+% of identifiers, and index and T.of.C. processing.
+% This, too, is unnecessary, for one could simply redefine some
+% WEB macros to avoid the printing, but there are only a couple
+% of easy changes, so they have been made.
+%
+% 2/18 HWT Increased stack size to 400 (not for TeX-related programs).
+%
+% 3/18 HWT Brought up for Version 1.5. Made it print newline at end of
+% run.
+%
+% 4/13 PC Merged with Pavel's version, including adding a call to
+% exit() at the end of the program, based upon the value of
+% `history'.
+% 4/16 PC Brought up to version 1.5 released with TeX 0.97 in April 1983
+% 6/29 HWT Brought up to version 1.7 released with TeX 0.99 in June 1983,
+% introducing a new change file format
+% 7/17 HWT Brought up to version 2.0 released with TeX 0.999 in July 1983
+% 7/29 HWT Brought up to version 2.1
+% 11/17 HWT Brought up to version 2.4 released with TeX 1.0. Made
+% changes to use C routines for I/O, for speedup.
+% 1/31 HWT Brought up to version 2.6
+% 12/28/85 PAM Brought up to version 2.8 (like 2.7, version number only)
+% 3/6/87 PAM Brought up to version 2.9 (like 2.8, version number only)
+% 8/10/89 don Brought up to version 3.1, with `otherwise' fixed too
+% 8/31/89 don Brought up to version 4, with all possible characters enabled
+% 10/16/89 don fixed bug when ".web" and ".ch" are explicitly stated
+
+% NOTE: The module numbers refer to the standard WEB manual (CS 980).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [0] WEAVE: print changes only
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+\pageno=\contentspagenumber \advance\pageno by 1
+@y
+\pageno=\contentspagenumber \advance\pageno by 1
+\let\maybe=\iffalse
+\def\title{WEAVE changes for Berkeley {\mc UNIX}}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [1] Change banner message
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@d banner=='This is WEAVE, Version 4'
+@y
+@d banner=='This is WEAVE, Version 4 for SunOS'
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [2] add input and output, remove other files, add ref to scan_args,
+% [2] and #include external definition for exit(), etc.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+program WEAVE(@!web_file,@!change_file,@!tex_file);
+label end_of_WEAVE; {go here to finish}
+const @<Constants in the outer block@>@/
+type @<Types in the outer block@>@/
+var @<Globals in the outer block@>@/
+@<Error handling procedures@>@/
+@y
+program WEAVE(@!input,@!output);
+label end_of_WEAVE; {go here to finish}
+const @<Constants in the outer block@>@/
+type @<Types in the outer block@>@/
+var @<Globals in the outer block@>@/
+@\
+@=#include "tangext.h"@>
+@\@/
+@<Error handling procedures@>@/
+@<|scan_args| procedure@>@/
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [3] Show statistics
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@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== {I'm gathering usage statistics}
+@d tats== {because I have to know how close \TeX\ comes to the limits}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [4] compiler options
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@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
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [7] Fix others:
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@d othercases == others: {default for cases not listed explicitly}
+@y
+@d othercases == otherwise {SunOS Pascal default cases}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [8] Constants: Make stack_size=400 instead of 200
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@!stack_size=200; {number of simultaneous output levels}
+@y
+@!stack_size=400; {number of simultaneous output levels}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [17] enable maximum character set
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+for i:=1 to @'37 do xchr[i]:=' ';
+for i:=@'200 to @'377 do xchr[i]:=' ';
+@y
+for i:=1 to @'37 do xchr[i]:=chr(i);
+for i:=@'200 to @'377 do xchr[i]:=chr(i);
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [20] terminal output: use standard i/o
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@d print(#)==write(term_out,#) {`|print|' means write on the terminal}
+@y
+@d term_out==output
+@d print(#)==write(term_out,#) {`|print|' means write on the terminal}
+@z
+
+@x
+@<Globals...@>=
+@!term_out:text_file; {the terminal as an output file}
+@y
+
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [21] init terminal
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@ Different systems have different ways of specifying that the output on a
+certain file will appear on the user's terminal. Here is one way to do this
+on the \PASCAL\ system that was used in \.{TANGLE}'s initial development:
+@^system dependencies@>
+
+@<Set init...@>=
+rewrite(term_out,'TTY:'); {send |term_out| output to the terminal}
+@y
+@ Different systems have different ways of specifying that the output on a
+certain file will appear on the user's terminal.
+@^system dependencies@>
+
+@<Set init...@>=
+; {nothing need be done}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [22] flush terminal buffer
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@d update_terminal == break(term_out) {empty the terminal output buffer}
+@y
+@d update_terminal == flush(term_out) {empty the terminal output buffer}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [24] open input files
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@ The following code opens the input files. Since these files were listed
+in the program header, we assume that the \PASCAL\ runtime system has
+already checked that suitable file names have been given; therefore no
+additional error checking needs to be done. We will see below that
+\.{WEAVE} reads through the entire input twice.
+@^system dependencies@>
+
+@p procedure open_input; {prepare to read |web_file| and |change_file|}
+begin reset(web_file); reset(change_file);
+end;
+@y
+@ The following code opens the input files.
+This is called after |scan_args| has filled the file name variables
+appropriately.
+@^system dependencies@>
+
+@p procedure open_input; {prepare to read |web_file| and |change_file|}
+begin reset(web_file,web_name);
+ reset(change_file,change_name);
+end;
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [26] opening tex file
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@ The following code opens |tex_file|.
+Since this file was listed in the program header, we assume that the
+\PASCAL\ runtime system has checked that a suitable external file name has
+been given.
+@^system dependencies@>
+
+@<Set init...@>=
+rewrite(tex_file);
+@y
+@ The following code opens |tex_file|.
+The |scan_args| procedure is used to set up |tex_name| as required.
+@^system dependencies@>
+
+@<Set init...@>=
+scan_args;
+rewrite(tex_file,tex_name);
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [28] faster input_ln
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@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}
+ if final_limit>limit then final_limit:=limit;
+ 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
+With Berkeley {\mc UNIX} we call an external C procedure, |line_read|.
+That routine fills |buffer| from 0 onwards with the |xord|'ed values
+of the next line, setting |limit| appropriately (ignoring trailing
+blanks).
+It will stop if |limit=buf_size|, and the following will cause an error
+message.
+Note: for bootstrapping purposes it is all right to use the original form
+of |input_ln|; it will just run slower.
+
+@p function input_ln(var f:text_file):boolean;
+ {inputs a line or returns |false|}
+begin limit:=0;
+if test_eof(f) then input_ln:=false
+else begin line_read(f);
+ if limit=buf_size then
+ begin
+ decr(limit); {keep |buffer[buf_size]| empty}
+ print_nl('! Input line too long'); loc:=0; error;
+@.Input line too long@>
+ end;
+ input_ln:=true;
+ end;
+end;
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [50] don't enter xrefs if no_xref set
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@d append_xref(#)==if xref_ptr=max_refs then overflow('cross reference')
+ else begin incr(xref_ptr); num(xref_ptr):=#;
+ end
+
+@p procedure new_xref(@!p:name_pointer);
+label exit;
+var q:xref_number; {pointer to previous cross reference}
+@!m,@!n: sixteen_bits; {new and previous cross-reference value}
+begin if (reserved(p)or(byte_start[p]+1=byte_start[p+ww]))and
+@y
+If the user has sent the |no_xref| flag (the -x option of the command line),
+then it is unnecessary to keep track of cross references for identifers.
+If one were careful, one could probably make more changes around module
+100 to avoid a lot of identifier looking up.
+
+@d append_xref(#)==if xref_ptr=max_refs then overflow('cross reference')
+ else begin incr(xref_ptr); num(xref_ptr):=#;
+ end
+
+@p procedure new_xref(@!p:name_pointer);
+label exit;
+var q:xref_number; {pointer to previous cross-reference}
+@!m,@!n: sixteen_bits; {new and previous cross-reference value}
+begin if no_xref then return;
+if (reserved(p)or(byte_start[p]+1=byte_start[p+ww]))and
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [122] faster flush_buffer
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+done: for k:=1 to j do write(tex_file,xchr[out_buf[k]]);
+@y
+done: linewrite(tex_file,j);
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [239] omit index and module names if no_xref set
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@* Phase three processing.
+We are nearly finished! \.{WEAVE}'s only remaining task is to write out the
+index, after sorting the identifiers and index entries.
+
+@<Phase III: Output the cross-reference index@>=
+phase_three:=true; print_nl('Writing the index...');
+if change_exists then
+ begin finish_line; @<Tell about changed modules@>;
+ end;
+finish_line; out4("\")("i")("n")("x"); finish_line;
+@.\\inx@>
+@<Do the first pass of sorting@>;
+@<Sort and output the index@>;
+out4("\")("f")("i")("n"); finish_line;
+@.\\fin@>
+@<Output all the module names@>;
+out4("\")("c")("o")("n"); finish_line;
+@.\\con@>
+print('Done.');
+@y
+@* Phase three processing.
+We are nearly finished! \.{WEAVE}'s only remaining task is to write out the
+index, after sorting the identifiers and index entries.
+
+If the user has set the |no_xref| flag (the -x option on the command line),
+just finish off the page, omitting the index, module name list, and table of
+contents.
+
+@<Phase III: Output the cross-reference index@>=
+if no_xref then begin
+ finish_line;
+ out("\"); out5("v")("f")("i")("l")("l");
+ out4("\")("e")("n")("d");
+ finish_line;
+ end
+else begin
+phase_three:=true; print_nl('Writing the index...');
+finish_line;
+out("\"); out5("i")("n")("p")("u")("t"); out(" ");
+out5("I")("N")("D")("E")("X");
+finish_line;
+out("\"); out5("i")("n")("p")("u")("t"); out5(" ")("M")("O")("D")("U");
+out5("L")("E")("_")("N")("A"); out3("M")("E")("S");
+finish_line;
+rewrite(tex_file,'INDEX.tex');
+if change_exists then
+ begin @<Tell about changed modules@>;
+ end;
+finish_line; finish_line; out4("\")("i")("n")("x"); finish_line;
+@.\\inx@>
+@<Do the first pass of sorting@>;
+@<Sort and output the index@>;
+out4("\")("f")("i")("n"); finish_line;
+@.\\fin@>
+rewrite(tex_file,'MODULE_NAMES.tex');
+@<Output all the module names@>;
+out4("\")("c")("o")("n"); finish_line;
+@.\\con@>
+print('Done.');
+end;
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [258] term_in == input, when debugging
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+any error stop will set |debug_cycle| to zero.
+@y
+any error stop will set |debug_cycle| to zero.
+
+@d term_in==input
+@z
+
+@x
+@!term_in:text_file; {the user's terminal as an input file}
+@y
+
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [259] Take out reset(term_in)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+reset(term_in,'TTY:','/I'); {open |term_in| as the terminal, don't do a |get|}
+@y
+
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [261] print newline at end of run and exit based upon value of history
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@p procedure Phase_I;
+@y
+@d UNIXexit==e@&x@&i@&t
+
+@p procedure Phase_I;
+@z
+
+@x
+end.
+@y
+new_line;
+if (history <> spotless) and (history <> harmless_message) then
+ UNIXexit(1)
+else
+ UNIXexit(0);
+end.
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [264] system dependent changes--the scan_args procedure
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@* System-dependent changes.
+This module should be replaced, if necessary, by changes to the program
+that are necessary to make \.{WEAVE} 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.
+@^system dependencies@>
+@y
+@* System-dependent changes.
+The user calls \.{WEAVE} with arguments on the command line.
+These are either file names or flags (beginning with '-').
+The following globals are for communicating the user's desires to the rest
+of the program. The various |file_name| variables contain strings with
+the full names of those files, as UNIX knows them.
+
+The only flag that affects weave is |'-x'| whose status is kept in |no_xref|.
+
+@d max_file_name_length==60
+
+@<Globals...@>=
+@!web_name,@!change_name,@!tex_name:
+ array[1..max_file_name_length] of char;
+@!no_xref:boolean;
+
+@ The |scan_args| procedure looks at the command line arguments and sets
+the |file_name| variables accordingly.
+At least one file name must be present: the \.{WEB} file. It may have
+an extension, or it may omit it to get |'.web'| added.
+The \TeX\ output file name is formed by replacing the \.{WEB} file
+name extension by |'.tex'|.
+
+If there is another file name present among the arguments, it is the
+change file, again either with an extension or without one to get |'.ch'|
+An omitted change file argument means that |'/dev/null'| should be used,
+when no changes are desired.
+
+An argument beginning with a minus sign is a flag.
+Any letters following the minus sign may cause global flag variables to be
+set.
+Currently, an |x| means that the cross referencing information---the index,
+the module name list, and the table of contents---is to be suppressed.
+
+@<|scan_args|...@>=
+procedure scan_args;
+var dot_pos,i,a: integer; {indices}
+@!fname: array[1..max_file_name_length-5] of char; {temporary argument holder}
+@!found_web,@!found_change: boolean; {|true| when those file names have
+ been seen}
+begin
+found_web:=false;
+found_change:=false;
+no_xref:=false;
+for a:=1 to argc-1 do begin
+ argv(a,fname); {put argument number |a| into |fname|}
+ if fname[1]<>'-' then begin
+ if not found_web then
+ @<Get |web_name|, |pascal_name|, and
+ | pool_name| variables from |fname|@>
+ else if not found_change then
+ @<Get |change_name| from |fname|@>
+ else @<Print usage error message and quit@>;
+ end
+ else @<Handle flag argument in |fname|@>;
+ end;
+if not found_web then @<Print usage error message and quit@>;
+if not found_change then @<Set up null change file@>;
+end;
+
+@ Use all of |fname| for the |web_name| if there is a |'.'| in it,
+otherwise add |'.web'|.
+The other file names come from adding things after the dot.
+The |argv| procedure will not put more than |max_file_name_length-5|
+characters into |fname|, and this leaves enough room in the |file_name|
+variables to add the extensions.
+
+The end of a file name is marked with a |' '|, the convention assumed by
+the |reset| and |rewrite| procedures.
+
+@<Get |web_name|...@>=
+begin
+dot_pos:=-1;
+i:=1;
+while (fname[i]<>' ') and (i<=max_file_name_length-5) do begin
+ web_name[i]:=fname[i];
+ if fname[i]='.' then dot_pos:=i;
+ incr(i);
+ end;
+if dot_pos=-1 then begin
+ dot_pos:=i;
+ web_name[dot_pos]:='.';
+ web_name[dot_pos+1]:='w';
+ web_name[dot_pos+2]:='e';
+ web_name[dot_pos+3]:='b';
+ web_name[dot_pos+4]:=' ';
+ end
+else web_name[i]:=' ';
+for i:=1 to dot_pos do begin
+ tex_name[i]:=web_name[i];
+ end;
+tex_name[dot_pos+1]:='t';
+tex_name[dot_pos+2]:='e';
+tex_name[dot_pos+3]:='x';
+tex_name[dot_pos+4]:=' ';
+found_web:=true;
+end
+
+@
+
+@<Get |change_name|...@>=
+begin
+dot_pos:=-1;
+i:=1;
+while (fname[i]<>' ') and (i<=max_file_name_length-5)
+do begin
+ change_name[i]:=fname[i];
+ if fname[i]='.' then dot_pos:=i;
+ incr(i);
+ end;
+if dot_pos=-1 then begin
+ dot_pos:=i;
+ change_name[dot_pos]:='.';
+ change_name[dot_pos+1]:='c';
+ change_name[dot_pos+2]:='h';
+ change_name[dot_pos+3]:=' ';
+ end
+else change_name[i]:=' ';
+found_change:=true;
+end
+
+@
+
+@<Set up null...@>=
+begin
+ change_name[1]:='/';
+ change_name[2]:='d';
+ change_name[3]:='e';
+ change_name[4]:='v';
+ change_name[5]:='/';
+ change_name[6]:='n';
+ change_name[7]:='u';
+ change_name[8]:='l';
+ change_name[9]:='l';
+ change_name[10]:=' ';
+end
+
+@
+
+@<Handle flag...@>=
+begin
+i:=2;
+while (fname[i]<>' ') and (i<=max_file_name_length-5) do begin
+ if fname[i]='x' then no_xref:=true;
+ incr(i);
+ end;
+end
+
+@
+
+@<Print usage error message and quit@>=
+begin
+print_nl('! Usage: weave webfile[.web] [changefile[.ch]] [-x]');
+error;
+jump_out;
+end
+
+@z