% Derived from INITEX.CH for Berkeley Unix TeX 1.1, by Howard Trickey % and Pavel Curtis % Modification History: % % brought up to version 2.7182 on 8/8/98 --- don % brought up to version 2.718 on 3/8/95 --- don % UNIXexit convention switched 2/21/93 --- don % tfm_out needed to be corrected for new Pascal compiler 7/18/92 --- don % brought up to version 2.71 on 9/20/91 --- don % brought up to version 2.7 on 9/6/90 --- don % fixed max_buf_stack logic (it was one too high) on 1/22/90 --- don % brought up to version 1.9 on 12/20/89 --- don % brought up to version 1.8 on 10/14/89 --- don % 8-bit modifications made 9/11/89 --- don % % don adapted everything for SunOS, MF Version 1.7, on 8/12/89 % Module numbers changed to match Volume D % Changes made more consistent with initex.ch % Window code merged in, with hooks to remove it for the TRAP test % % Revision 1.3 87/03/07 21:15:21 mackay % % Minor changes found on archive version on SCORE % (max_in_open increased to 10. -- 88/02/07 PAM) % % Revision 1.2 86/09/29 21:46:43 mackay % % Made no-debug the default, and changed version number % to correspond with improved mf.web file % (Got rid of debug code to avoid bug in range check % code of VAX4.3 BSD and SUN3 version 3.x Os pc interpreter) % % Revision 1.0 86/01/31 15:46:08 richards % Released for MF 1.0; % % Incorporates: New binary I/O library, separate optimized % arithmetic for takefraction/makefraction, new graphics interface % % Revision 0.999999.1.2 86/01/28 19:49:38 richards % Added: % variable "dummy" to routine initterm() because SUN PC compiler % loops with only i,j,k defined. Argh! % % Revision 0.999999.1.1 86/01/21 23:05:16 richards % First cut for MF 1.0 % % Revision 0.999999 86/01/13 00:40:25 richards % Released for 0.999999: % added OTHERCASES sentinel % revised WINDOW interface and include files % % Revision 0.99999 85/12/09 20:23:35 richards % Version for 0.99999 % % Revision 0.9999 85/10/21 20:48:24 richards % Released for MF version 0.9999 % % Revision 0.999 85/10/18 21:33:44 richards % Version that works with 0.999 MF (Never released) % % Revision 0.91 85/05/16 10:58:13 richards % Released for MF version 0.91 % % Revision 0.81 85/05/05 12:24:08 richards % Released for MF version 0.81 % % Revision 0.77 85/03/11 20:23:37 richards % Released for MF version 0.77 % % Revision 0.6.1.1 85/02/12 20:12:32 richards % First edit for 0.76 % % Revision 0.6 85/02/08 00:52:40 richards % Distribution version for MF 0.6 % % Revision 0.0.2.1 84/12/06 03:43:33 richards % Edited to work with 0.4 -- still needs to have section numbers re-done % before release. % % Revision 0.0 84/11/05 00:50:38 richards % Base version (first cut) for MetaFont 0.0 % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [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{{\logo opqrstuq} changes for SunOS} \def\glob{13}\def\gglob{20, 25} % these are defined in module 1 @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.2] banner line %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d banner=='This is METAFONT, Version 2.7182' {printed when \MF\ starts} @y @d banner=='This is METAFONT, Version 2.7182 for SunOS' {printed when \MF\ starts} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.4] program header, include ext.h for C routine linkage %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x Actually the heading shown here is not quite normal: The |program| line does not mention any |output| file, because \ph\ would ask the \MF\ 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 MF; {all file names are defined dynamically} @y program MF(standard_input,output); {other file names are defined dynamically} @z @x var @<Global variables@>@/ @y var @<Global 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==@t@>@} @z % (I will use the debug code only in the trap test) @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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.10] othercases, feature of Sun Pascal %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d othercases == others: {default for cases not listed explicitly} @y @d othercases == otherwise {default for cases not listed explicitly} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.11] compile-time constants %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @<Constants...@>= @!mem_max=30000; {greatest index in \MF's internal |mem| array; must be strictly less than |max_halfword|; must be equal to |mem_top| in \.{INIMF}, otherwise |>=mem_top|} @!max_internal=100; {maximum number of internal quantities} @!buf_size=500; {maximum number of characters simultaneously present in current lines of open files; 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} @!screen_width=768; {number of pixels in each row of screen display} @!screen_depth=1024; {number of pixels in each column of screen display} @!stack_size=30; {maximum number of simultaneous input sources} @!max_strings=2000; {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 identifier names and strings, after \MF'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 identifiers; must exceed |string_vacancies| by the total length of \MF's own strings, which is currently about 22000} @!move_size=5000; {space for storing moves in a single octant} @!max_wiggle=300; {number of autorounded points per cycle} @!gf_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='MFbases:MF.POOL '; {string of length |file_name_size|; tells where the string pool appears} @y @<Constants...@>= @!mem_max=30000; {greatest index in \MF's internal |mem| array; must be strictly less than |max_halfword|; must be equal to |mem_top| in \.{INIMF}, otherwise |>=mem_top|} @!max_internal=100; {maximum number of internal quantities} @!buf_size=500; {maximum number of characters simultaneously present in current lines of open files; 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} @!screen_width=1024; {number of pixels in each row of screen display} @!screen_depth=800; {number of pixels in each column of screen display} @!stack_size=30; {maximum number of simultaneous input sources} @!max_strings=3000; {maximum number of strings; must not exceed |max_halfword|} @!string_vacancies=18000; {the minimum number of characters that should be available for the user's identifier names and strings, after \MF's own error messages are stored} @!pool_size=42000; {maximum number of characters in strings, including all error messages and help texts, and the names of all identifiers; must exceed |string_vacancies| by the total length of \MF's own strings, which is currently about 22000} @!move_size=5000; {space for storing moves in a single octant} @!max_wiggle=300; {number of autorounded points per cycle} @!gf_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='mf.pool'; {string of length |file_name_size|; tells where the string pool appears} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.12] sensitive compile-time constants %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d mem_min=0 {smallest index in the |mem| array, must not be less than |min_halfword|} @d mem_top==30000 {largest index in the |mem| array dumped by \.{INIMF}; must be substantially larger than |mem_min| and not greater than |mem_max|} @d hash_size=2100 {maximum number of symbolic tokens, must be less than |max_halfword-3*param_size|} @d hash_prime=1777 {a prime number equal to about 85\pct! of |hash_size|} @d max_in_open=6 {maximum number of input files and error insertions that can be going on simultaneously} @d param_size=150 {maximum number of simultaneous macro parameters} @y @d mem_min==-30000 {smallest index in the |mem| array, must not be less than |min_halfword|} @d mem_top==30000 {largest index in the |mem| array dumped by \.{INIMF}; must be substantially larger than |mem_min| and not greater than |mem_max|} @d hash_size=2100 {maximum number of symbolic tokens, must be less than |max_halfword-3*param_size|} @d hash_prime=1777 {a prime number equal to about 85\pct! of |hash_size|} @d max_in_open=10 {maximum number of input files and error insertions that can be going on simultaneously. Enlarged for Silvio Levy's Greek} @d param_size=150 {maximum number of simultaneous macro parameters} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [1.22] Permissive input %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @^character set dependencies@> @^system dependencies@> @<Set init...@>= for i:=0 to @'37 do xchr[i]:=' '; for i:=@'177 to @'377 do xchr[i]:=' '; @y @^character set dependencies@> @^system dependencies@> @d tab = @'11 { ASCII horizontal tab } @d form_feed = @'14 { ASCII form-feed } @<Set init...@>= for i:=0 to @'37 do xchr[i]:=chr(i); for i:=@'177 to @'377 do xchr[i]:=chr(i); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.24] 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.25] add real_name_of_file array for search path resolution %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @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 \MF\ 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 \MF\ 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.26] file opening %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @ The \ph\ compiler with which the present version of \MF\ 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 \MF\ to undertake appropriate corrective action. @:PASCAL H}{\ph@> @^system dependencies@> \MF'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_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 \MF\ 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. 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 base_file_path=4 {path specifier for base 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_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,base_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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.27] 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. @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|. @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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.30] faster version of input_ln %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x Standard \PASCAL\ says that a file should have |eoln| immediately before |eof|, but \MF\ needs only a weaker restriction: If |eof| occurs in the middle of a line, the system function |eoln| should return a |true| result (even though |f^| will be undefined). @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\thinspace:\thinspace30} 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 @<Report overflow of the input buffer, and abort@>; 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 Standard \PASCAL\ says that a file should have |eoln| immediately before |eof|, but \MF\ needs only a weaker restriction: If |eof| occurs in the middle of a line, the system function |eoln| should return a |true| result (even though |f^| will be undefined). 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|. @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\thinspace:\thinspace30} 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; if max_buf_stack>=buf_size then @<Report overflow of the input buffer, and abort@>; 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.31] 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.32] 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.33] 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [3.36] 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 dummy, i, j, k: 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; k := 100; {find last non-blank char in arg} while (k > 1) and (arg[k] = ' ') do@/ decr(k); while (j <= k) do begin buffer[last] := xord[arg[j]]; incr(j); incr(last); end; if k > 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_ln(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.'); @.Please type the name...@> 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 MF.POOL lowercase in messages %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x else bad_pool('! I can''t read MF.POOL.') @y else bad_pool('! I can''t read mf.pool.') @z @x begin if eof(pool_file) then bad_pool('! MF.POOL has no check sum.'); @y begin if eof(pool_file) then bad_pool('! mf.pool has no check sum.'); @z @x bad_pool('! MF.POOL line doesn''t begin with two digits.'); @y bad_pool('! mf.pool line doesn''t begin with two digits.'); @z @x bad_pool('! MF.POOL check sum doesn''t have nine digits.'); @y bad_pool('! mf.pool check sum doesn''t have nine digits.'); @z @x done: if a<>@$ then bad_pool('! MF.POOL doesn''t match; TANGLE me again.'); @y done: if a<>@$ then bad_pool('! mf.pool doesn''t match; tangle me again.'); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [6.79] 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 the name of the file that should be edited and the relevant line number. @^system dependencies@> There is a secret `\.D' option available when the debugging routines haven't 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 \MF\ 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[file_ptr] @z @x "E": if file_ptr>0 then begin print_nl("You want to edit file "); @.You want to edit file x@> slow_print(input_stack[file_ptr].name_field); print(" at line "); print_int(line);@/ interaction:=scroll_mode; jump_out; @y "E": if file_ptr>0 then begin ed_name_start:=str_start[edit_file.name_field]; ed_name_length:=str_start[edit_file.name_field+1] - str_start[edit_file.name_field]; edit_line:=line; jump_out; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [7.107,108] replace make_fraction with external routine %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @p function make_fraction(@!p,@!q:integer):fraction; var @!f:integer; {the fraction bits, with a leading 1 bit} @!n:integer; {the integer part of $\vert p/q\vert$} @!negative:boolean; {should the result be negated?} @!be_careful:integer; {disables certain compiler optimizations} begin if p>=0 then negative:=false else begin negate(p); negative:=true; end; if q<=0 then begin debug if q=0 then confusion("/");@;@+gubed@;@/ @:this can't happen /}{\quad \./@> negate(q); negative:=not negative; end; n:=p div q; p:=p mod q; if n>=8 then begin arith_error:=true; if negative then make_fraction:=-el_gordo@+else make_fraction:=el_gordo; end else begin n:=(n-1)*fraction_one; @<Compute $f=\lfloor 2^{28}(1+p/q)+{1\over2}\rfloor$@>; if negative then make_fraction:=-(f+n)@+else make_fraction:=f+n; end; end; @ The |repeat| loop here preserves the following invariant relations between |f|, |p|, and~|q|: (i)~|0<=p<q|; (ii)~$fq+p=2^k(q+p_0)$, where $k$ is an integer and $p_0$ is the original value of~$p$. Notice that the computation specifies |(p-q)+p| instead of |(p+p)-q|, because the latter could overflow. Let us hope that optimizing compilers do not miss this point; a special variable |be_careful| is used to emphasize the necessary order of computation. Optimizing compilers should keep |be_careful| in a register, not store it in memory. @^inner loop@> @<Compute $f=\lfloor 2^{28}(1+p/q)+{1\over2}\rfloor$@>= f:=1; repeat be_careful:=p-q; p:=be_careful+p; if p>=0 then f:=f+f+1 else begin double(f); p:=p+q; end; until f>=fraction_one; be_careful:=p-q; if be_careful+p>=0 then incr(f) @y Under {\mc UNIX} \MF, we have replaced the \PASCAL\ version of |make_fraction| with either a C or assembly language equivalent for efficiency. @ This section was deleted when |make_fraction| was removed. @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [7.109,110,111] replace take_fraction with external version %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @p function take_fraction(@!q:integer;@!f:fraction):integer; var @!p:integer; {the fraction so far} @!negative:boolean; {should the result be negated?} @!n:integer; {additional multiple of $q$} @!be_careful:integer; {disables certain compiler optimizations} begin @<Reduce to the case that |f>=0| and |q>0|@>; if f<fraction_one then n:=0 else begin n:=f div fraction_one; f:=f mod fraction_one; if q<=el_gordo div n then n:=n*q else begin arith_error:=true; n:=el_gordo; end; end; f:=f+fraction_one; @<Compute $p=\lfloor qf/2^{28}+{1\over2}\rfloor-q$@>; be_careful:=n-el_gordo; if be_careful+p>0 then begin arith_error:=true; n:=el_gordo-p; end; if negative then take_fraction:=-(n+p) else take_fraction:=n+p; end; @ @<Reduce to the case that |f>=0| and |q>0|@>= if f>=0 then negative:=false else begin negate(f); negative:=true; end; if q<0 then begin negate(q); negative:=not negative; end; @ The invariant relations in this case are (i)~$\lfloor(qf+p)/2^k\rfloor =\lfloor qf_0/2^{28}+{1\over2}\rfloor$, where $k$ is an integer and $f_0$ is the original value of~$f$; (ii)~$2^k\L f<2^{k+1}$. @^inner loop@> @<Compute $p=\lfloor qf/2^{28}+{1\over2}\rfloor-q$@>= p:=fraction_half; {that's $2^{27}$; the invariants hold now with $k=28$} if q<fraction_four then repeat if odd(f) then p:=half(p+q)@+else p:=half(p); f:=half(f); until f=1 else repeat if odd(f) then p:=p+half(q-p)@+else p:=half(p); f:=half(f); until f=1 @y Function |take_fraction| has also been replaced by an external routine. @ @<Reduce to the case that |f>=0| and |q>0|@>= if f>=0 then negative:=false else begin negate(f); negative:=true; end; if q<0 then begin negate(q); negative:=not negative; end; @ This section was deleted when |take_fraction| was replaced by an external routine. (But the previous section was left in, because it is part of |take_scaled|, which follows.) @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [9.153] ranges for quarter,half words %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x can get 256 values into a quarterword only if the subrange is `|-128..127|'. The present implementation tries to accommodate as many variations as possible, so it makes few 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 can get 256 values into a quarterword only 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [11.178] fix the word "free" so that it doesn't conflict with a runtime proc %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x been included. (You may want to decrease the size of |mem| while you @^debugging@> are debugging.) @y been included. (You may want to decrease the size of |mem| while you @^debugging@> are debugging.) @d free==free_arr @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [12.194] fix_date_and_time %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @ The following procedure, which is called just before \MF\ 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. Note that the values are |scaled| integers. Hence \MF\ can no longer be used after the year 32767. @p procedure fix_date_and_time; begin internal[time]:=12*60*unity; {minutes since midnight} internal[day]:=4*unity; {fourth day of the month} internal[month]:=7*unity; {seventh month of the year} internal[year]:=1776*unity; {Anno Domini} end; @y @ The following procedure, which is called just before \MF\ 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@> Note that the values are |scaled| integers. Hence \MF\ can no longer be used after the year 32767. @p procedure fix_date_and_time; begin date_and_time(internal[time],internal[day],internal[month],internal[year]); internal[time] := internal[time] * unity; internal[day] := internal[day] * unity; internal[month] := internal[month] * unity; internal[year] := internal[year] * unity; end; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [12.199] allow <tab> and <ff> as input %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x for k:=0 to " "-1 do char_class[k]:=invalid_class; for k:=127 to 255 do char_class[k]:=invalid_class; @y for k:=0 to " "-1 do char_class[k]:=invalid_class; for k:=127 to 255 do char_class[k]:=invalid_class; char_class[tab]:=space_class; char_class[form_feed]:=space_class; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [27.564] init_screen and update_screen are external C procs %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % BEGIN HOOK FOR THE TRAP TEST %@x %begin init_screen:=false; %@y %begin init_screen:=true; %@z @x The \PASCAL\ code here is a minimum version of |init_screen| and |update_screen|, usable on \MF\ installations that don't support screen output. If |init_screen| is changed to return |true| instead of |false|, the other routines will simply log the fact that they have been called; they won't really display anything. The standard test routines for \MF\ use this log information to check that \MF\ is working properly, but the |wlog| instructions should be removed from production versions of \MF. @p function init_screen:boolean; begin init_screen:=false; end; @# procedure update_screen; {will be called only if |init_screen| returns |true|} begin @!init wlog_ln('Calling UPDATESCREEN');@+tini {for testing only} end; @y We declare the screen functions for the {\mc UNIX} version of \MF\ in the following header file. @p @\@=#include "mf_window.h"@>@\ {declarations for external C procedures} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [27.559] blank_rectangle is an external C proc %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x The commented-out code in the following procedure is for illustrative purposes only. @^system dependencies@> @p procedure blank_rectangle(@!left_col,@!right_col:screen_col; @!top_row,@!bot_row:screen_row); var @!r:screen_row; @!c:screen_col; begin @{@+for r:=top_row to bot_row-1 do for c:=left_col to right_col-1 do screen_pixel[r,c]:=white;@+@}@/ @!init wlog_cr; {this will be done only after |init_screen=true|} wlog_ln('Calling BLANKRECTANGLE(',left_col:1,',', right_col:1,',',top_row:1,',',bot_row:1,')');@+tini end; @y @^system dependencies@> The procedure |blank_rectangle| has been declared an external routine for the {\mc UNIX} version of \MF\ in the header file above. @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [27.560] paint_row is an external C proc %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x The general idea is to paint blocks of pixels in alternate colors; the precise details are best conveyed by means of a \PASCAL\ program (see the commented-out code below). @^system dependencies@> @p procedure paint_row(@!r:screen_row;@!b:pixel_color;var @!a:trans_spec; @!n:screen_col); var @!k:screen_col; {an index into |a|} @!c:screen_col; {an index into |screen_pixel|} begin @{ k:=0; c:=a[0]; repeat incr(k); repeat screen_pixel[r,c]:=b; incr(c); until c=a[k]; b:=black-b; {$|black|\swap|white|$} until k=n;@+@}@/ @!init wlog('Calling PAINTROW(',r:1,',',b:1,';'); {this is done only after |init_screen=true|} for k:=0 to n do begin wlog(a[k]:1); if k<>n then wlog(','); end; wlog_ln(')');@+tini end; @y @^system dependencies@> |Paint_row| has been declared an external routine in the {\mc UNIX} version of \MF\ in the header file above. @z % END HOOK FOR THE TRAP TEST %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.768] 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 SunOS 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.769] MF area directories %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d MF_area=="MFinputs:" @.MFinputs@> @y Under Berkeley {\mc UNIX}, the default paths are specified in a seprate file, `\.{mfpaths.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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.771] more_name %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x begin if c=" " then more_name:=false else begin if (c=">")or(c=":") then @y begin if (c=" ")or(c=tab) then more_name:=false else begin if (c="/") then @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.775] default base %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d base_default_length=18 {length of the |MF_base_default| string} @d base_area_length=8 {length of its area part} @d base_ext_length=5 {length of its `\.{.base}' 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 base_default_length=10 {length of the |MF_base_default| string} @d base_area_length=0 {length of its area part} @d base_ext_length=5 {length of its `\.{.base}' part} @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.776] plain base location %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x MF_base_default:='MFbases:plain.base'; @y MF_base_default:='plain.base'; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.779] w_open_in of base file needs to be called only once %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x pack_buffered_name(0,loc,j-1); {try first without the system file area} if w_open_in(base_file) then goto found; pack_buffered_name(base_area_length,loc,j-1); {now try the system base file area} if w_open_in(base_file) then goto found; @y pack_buffered_name(0,loc,j-1); if w_open_in(base_file) then goto found; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.780] make_name_string %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x which simply makes a \MF\ string from the value of |name_of_file|, should ideally be changed to deduce the full name of file~|f|, which is the file most recently opened, if it is possible to do this in a \PASCAL\ program. @^system dependencies@> This routine might be called after string memory has overflowed, hence we dare not use `|str_room|'. @p function make_name_string:str_number; var @!k:1..file_name_size; {index into |name_of_file|} begin if (pool_ptr+name_length>pool_size)or(str_ptr=max_strings) then make_name_string:="?" else begin for k:=1 to name_length do append_char(xord[name_of_file[k]]); make_name_string:=make_string; end; end; @y which simply makes a \MF\ string from the value of |name_of_file|, should ideally be changed to deduce the full name of file~|f|, which is the file most recently opened, 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@> This routine might be called after string memory has overflowed, hence we dare not use `|str_room|'. @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|} if (pool_ptr+name_length>pool_size)or(str_ptr=max_strings) then make_name_string:="?" else begin 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; end; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.781] scan_file_name ignore leading tabs as well as spaces %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @p procedure scan_file_name; label done; begin begin_name; while buffer[loc]=" " do incr(loc); @y @p procedure scan_file_name; label done; begin begin_name; while (buffer[loc]=" ")or(buffer[loc]=tab) do incr(loc); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.787] <Scan_file_name...> needs similar leading tab treatment %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @ @<Scan file name in the buffer@>= begin begin_name; k:=first; while (buffer[k]=" ")and(k<last) do incr(k); @y @ @<Scan file name in the buffer@>= begin begin_name; k:=first; while ((buffer[k]=" ")or(buffer[k]=tab))and(k<last) do incr(k); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.793] a_open_in of input file needs path selector %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x if a_open_in(cur_file) then goto done; if cur_area="" then begin pack_file_name(cur_name,MF_area,cur_ext); if a_open_in(cur_file) then goto done; end; @y if a_open_in(cur_file,input_file_path) then goto done; @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [38.793] 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); name:=cur_name; end; @y @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [45.1133] writing the tfm file %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @d tfm_out(#)==write(tfm_file,#) {output one byte to |tfm_file|} @y @d tfm_out(#) ==write(tfm_file,((#+128) mod 256)-128) @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [47.1154] write_gf %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @<Declare generic font output procedures@>= procedure write_gf(@!a,@!b:gf_index); var k:gf_index; begin for k:=a to b do write(gf_file,gf_buf[k]); end; @y For Berkeley {\mc UNIX}, this is going to be handled by an external procedure, |writegf|, which will do the output using |fwrite|. @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [49.1204] Delete ready_already; also add call to set_paths; % also add call to exit() depending upon value of `history' %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @ Now this is really it: \MF\ 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: \MF\ starts and ends here. Instead of testing |ready_already|, we give up the idea of a preloaded core image in favor of silently loading a format file based on the name by which this program has been invoked. For example, if the program is being called \.{mf}, we will load the \.{plain} base; if \.{cmmf}, we will load \.{cmmf.base}. On my machine the loading of a format isn't too slow. (I use the new string capabilities of Sun Pascal here; |my_name| will be declared {\bf varying} [100] {\bf of\/} |char|.) At the end of the job, we look at |history| to decide the correct exit code. We use 1 if |history <= warning_issued| and 0 otherwise. @d UNIXexit==e@&x@&i@&t @z @x t_open_out; {open the terminal for output} if ready_already=314159 then goto start_of_MF; @y t_open_out; {open the terminal for output} set_paths; @z @x start_of_MF: @<Initialize the output routines@>; @y start_of_MF: argv(0,my_name); if (my_name<>'inimf')and(my_name<>'trapmf') then begin if my_name = 'mf' then name_of_file:='plain.base' else name_of_file:=my_name+'.base'; if w_open_in(base_file) then if not load_base_file then begin w_close(base_file); goto final_end; end else w_close(base_file); end; @<Initialize the output routines@>; @z @x final_end: ready_already:=0; @y final_end: ready_already:=0; if (history <= warning_issued) then UNIXexit(0) else UNIXexit(1); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [49.1204] print new line before termination; switch to editor if nec. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x slow_print(log_name); print_char("."); end; end; @y slow_print(log_name); print_char("."); end; end; print_ln; if (ed_name_start<>0) and (interaction>batch_mode) then calledit(str_pool[ed_name_start],ed_name_length,edit_line); @z %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % [51.1214] add editor-switch variable to globals %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x @* \[51] System-dependent changes. This section should be replaced, if necessary, by any special modifications of the program that are necessary to make \MF\ 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 @* \[51] System-dependent changes. Here are the variables used to hold ``switch-to-editor'' information. And the omphaloskeptic variable too. @^system dependencies@> @<Global...@>= @!ed_name_start: pool_pointer; @!ed_name_length,@!edit_line: integer; @!my_name:varying [100] of char; @ The |ed_name_start| will be set to point into |str_pool| somewhere after its beginning if \MF\ is supposed to switch to an editor on exit. @<Set init...@>= ed_name_start:=0; @z