--- /dev/null
+% Change file for GNU Pascal and Linux
+% (by Don Knuth, 2000; see ../tex-sparc for the prehistory)
+% (I'm no longer keeping the "efficiency" changes; just enuf for TRIP test)
+%
+% Use this file as is to make an INITEX. To get triptex, use the
+% shell script ``ini_to_trip'' and re-TANGLE.
+
+% History:
+% 2000.04.30 first sketch --- untested --- see FIXTHIS for parts not done yet
+
+% NOTE: the module numbers in this change file refer to Volume B.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [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 GNU Pascal}
+\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 3.14159' {printed when \TeX\ starts}
+@y
+@d banner=='This is '#27'[33;1mNesTeX'#27'[0m, Version 3.14159 for '#27'[31;1mJava'#27'[0m'
+@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==@{ {the trip test will use debugging}
+@d gubed==@t@>@}
+@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
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [1.10] othercases, feature of ISO Extended 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
+@!mem_max=30000; {greatest index in \TeX's internal |mem| array;
+ must be strictly less than |max_halfword|;
+ must be equal to |mem_top| in \.{INITEX}, otherwise |>=mem_top|}
+@!mem_min=0; {smallest index in \TeX's internal |mem| array;
+ must be |min_halfword| or more;
+ must be equal to |mem_bot| in \.{INITEX}, otherwise |<=mem_bot|}
+@!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}
+@!trie_op_size=500; {space for ``opcodes'' in the hyphenation patterns}
+@!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=300000; {greatest index in \TeX's internal |mem| array;
+ must be strictly less than |max_halfword|;
+ must be equal to |mem_top| in \.{INITEX}, otherwise |>=mem_top|}
+@!mem_min=0; {smallest index in \TeX's internal |mem| array;
+ must be |min_halfword| or more;
+ must be equal to |mem_bot| in \.{INITEX}, otherwise |<=mem_bot|}
+@!buf_size=5000; {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=127; {maximum internal font number; must not exceed |max_quarterword|
+ and must be at most |font_base+256|}
+@!font_mem_size=40000; {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=30000; {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=100000; {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=6000; {space for saving values outside of current group; must be
+ at most |max_halfword|}
+@!trie_size=30000; {space for hyphenation patterns; should be larger for
+ \.{INITEX} than it is in production versions of \TeX}
+@!trie_op_size=500; {space for ``opcodes'' in the hyphenation patterns}
+@!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_bot=0 {smallest index in the |mem| array dumped by \.{INITEX};
+ must not be less than |mem_min|}
+@d mem_top==30000 {largest index in the |mem| array dumped by \.{INITEX};
+ must be substantially larger than |mem_bot|
+ and not greater 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-mem_min)/10|}
+@d hash_prime=1777 {a prime number equal to about 85\pct! of |hash_size|}
+@d hyph_size=307 {another prime; the number of \.{\\hyphenation} exceptions}
+@y
+@d mem_bot=0 {smallest index in the |mem| array dumped by \.{INITEX};
+ must not be less than |mem_min|}
+@d mem_top==300000 {largest index in the |mem| array dumped by \.{INITEX};
+ must be substantially larger than |mem_bot|
+ and not greater than |mem_max|}
+@d font_base=0 {smallest internal font number; must not be less
+ than |min_quarterword|}
+@d hash_size=10000 {maximum number of control sequences; it should be at most
+ about |(mem_max-mem_min)/10|}
+@d hash_prime=3443 {a prime number equal to about 85\pct! of |hash_size|}
+@d hyph_size=307 {another prime; the number of \.{\\hyphenation} exceptions}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [2.23] allow any character that we can input to get in
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+for i:=0 to @'37 do xchr[i]:=' ';
+for i:=@'177 to @'377 do xchr[i]:=' ';
+@y
+for i:=0 to @'37 do xchr[i]:=chr(i);
+for i:=@'177 to @'377 do xchr[i]:=chr(i);
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [3.25] file types
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@!eight_bits=0..255; {unsigned one-byte quantity}
+@!alpha_file=packed file of text_char; {files that contain textual data}
+@y
+@!eight_bits=ByteCard; {unsigned one-byte quantity}
+@!alpha_file=t@&e@&x@&t; {files that contain textual data}
+@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 `{\bf packed array
+$[\langle\\{any}\rangle]$ of \\{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
+@ 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 |Trim(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 |Trim(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, |Trim(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):boolean;
+ {open a text file for input}
+var str:String;
+begin
+reset(f,name_of_file);
+a_open_in:=IOResult=0;
+end;
+
+
+
+@#
+function a_open_out(var f:alpha_file):boolean;
+ {open a text file for output}
+var @!ok:boolean;
+begin
+ rewrite(f,Trim(name_of_file));
+a_open_out:=true;
+end;
+@#
+function b_open_in(var f:byte_file):boolean;
+ {open a binary file for input}
+var @!ok:boolean;
+begin
+ reset(f,Trim(name_of_file));
+b_open_in:=true;
+end;
+@#
+function b_open_out(var f:byte_file):boolean;
+ {open a binary file for output}
+var @!ok:boolean;
+begin
+ rewrite(f,Trim(name_of_file));
+b_open_out:=true;
+end;
+@#
+function w_open_in(var f:word_file):boolean;
+ {open a word file for input}
+var @!ok:boolean;
+begin
+ reset(f,Trim(name_of_file));
+w_open_in:=true;
+end;
+@#
+function w_open_out(var f:word_file):boolean;
+ {open a word file for output}
+var @!ok:boolean;
+begin
+ rewrite(f,Trim(name_of_file));
+w_open_out:=true;
+end;
+@z
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [3.32] term_in/out are input,output
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@!term_in:alpha_file; {the terminal as an input file}
+@!term_out:alpha_file; {the terminal as an output file}
+
+@y
+@!{the terminal as an input file}
+
+@z
+
+@x
+@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
+@d term_in==Input
+@d term_out==Output
+@d t_open_in==do_nothing
+@d t_open_out==do_nothing
+@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 == {nothing necessary on UNIX}
+@d clear_terminal == {nothing necessary on UNIX}
+@d wake_up_terminal == {nothing necessary on UNIX}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [4.38] string data
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@!packed_ASCII_code = 0..255; {elements of |str_pool| array}
+@y
+@!packed_ASCII_code = ByteCard; {elements of |str_pool| array}
+@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
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [8.110] ranges for quarter,half words FIXTHIS
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+@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
+@d min_quarterword=-128 {smallest allowable value in a |quarterword|}
+@d max_quarterword=127 {largest allowable value in a |quarterword|}
+@d min_halfword==-2147483648 {smallest allowable value in a |halfword|}
+@d max_halfword==2147483647 {largest allowable value in a |halfword|}
+@z
+
+@x
+@<Types...@>=
+@!quarterword = min_quarterword..max_quarterword; {1/4 of a word}
+@!halfword=min_halfword..max_halfword; {1/2 of a word}
+@!two_choices = 1..2; {used when there are two variants in a record}
+@!four_choices = 1..4; {used when there are four variants in a record}
+@y
+@<Types...@>=
+@!quarterword = min_quarterword..max_quarterword; {1/4 of a word}
+@!halfword=min_halfword..max_halfword; {1/2 of a word}
+@!two_choices = 1..2; {used when there are two variants in a record}
+@!four_choices = 1..4; {used when there are four variants in a record}
+@z
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [11.165] 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
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [12.186] glue_ratio fix FIXTHIS
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@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<>float_constant(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)>float_constant(20000) then
+ begin if g>float_constant(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<>float_constant(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
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [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 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
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% [29.516] more_name
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@x
+ if (c=">")or(c=":") then
+@y
+ 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 Linux 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 goto found;
+ pack_buffered_name(format_area_length,loc,j-1);
+ {now try the system format file area}
+ if w_open_in(fmt_file) then goto found;
+@y
+ pack_buffered_name(0,loc,j-1);
+ if w_open_in(fmt_file) then goto found;
+@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|, 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)or
+ (cur_length>0) 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 \TeX\ 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 |name_of_file|
+contains |name_of_file| prepended with the directory name that was found
+by path searching.
+If |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[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)or
+ (cur_length>0) then
+ make_name_string:="?"
+else begin
+ if (xord[name_of_file[1]]=".") and (xord[name_of_file[2]]="/") then
+ kstart:=3
+ else
+ kstart:=1;
+ for k:=kstart to name_length do append_char(xord[name_of_file[k]]);
+ make_name_string:=make_string;
+ end
+end;
+@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
+@ Here we have to ``prime the pump'' for the |temp_int| trick explained below.
+
+ @<Open |tfm_file| for input@>=
+file_opened:=false;
+pack_file_name(nom,aire,".tfm");
+if not b_open_in(tfm_file) then abort;
+begin
+ var temp_int:integer;
+ temp_int:=tfm_file^;
+ if temp_int<0 then temp_int:=temp_int+256;
+end;
+file_opened:=true
+@z
+
projects / nestedvm.git / commitdiff