summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/pltotf.ch
blob: de2951933e6c1fd359d188eb223129ea4a37717e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
% pltotf.ch for C compilation with web2c.
%
% 04/04/83 (PC)  Original version, made to work with version 1.2 of PLtoTF.
% 04/16/83 (PC)  Brought up to version 1.3 of PLtoTF.
% 06/30/83 (HWT) Revised changefile format for version 1.7 Tangle
% 07/28/83 (HWT) Brought up to version 2
% 12/19/86 (ETM) Brought up to version 2.1
% 07/05/87 (ETM) Brought up to version 2.3
% 03/22/88 (ETM) Converted for use with WEB to C
% 11/29/89 (KB)  Version 3.
% 01/16/90 (SR)  Version 3.2.
% (more recent changes in the ChangeLog)

@x [0] WEAVE: print changes only.
\pageno=\contentspagenumber \advance\pageno by 1
@y
\pageno=\contentspagenumber \advance\pageno by 1
\let\maybe=\iffalse
\def\title{PL$\,$\lowercase{to}$\,$TF changes for C}
@z

@x [still 2] No banner unless verbose.
procedure initialize; {this procedure gets things started properly}
  var @<Local variables for initialization@>@/
  begin print_ln(banner);@/
@y
@<Define |parse_arguments|@>
procedure initialize; {this procedure gets things started properly}
  var @<Local variables for initialization@>@/
begin
  kpse_set_program_name (argv[0], nil);
  parse_arguments;
@z

@x [3] Larger constants.
@!buf_size=60; {length of lines displayed in error messages}
@!max_header_bytes=100; {four times the maximum number of words allowed in
  the \.{TFM} file header block, must be 1024 or less}
@!max_param_words=30; {the maximum number of \.{fontdimen} parameters allowed}
@!max_lig_steps=5000;
  {maximum length of ligature program, must be at most $32767-257=32510$}
@!max_kerns=500; {the maximum number of distinct kern values}
@!hash_size=5003; {preferably a prime number, a bit larger than the number
  of character pairs in lig/kern steps}
@y
@!buf_size=3000; {length of lines displayed in error messages}
@!max_header_bytes=1000; {four times the maximum number of words allowed in
  the \.{TFM} file header block, must be 1024 or less}
@!max_param_words=254; {the maximum number of \.{fontdimen} parameters allowed}
@!max_lig_steps=32510;
  {maximum length of ligature program, must be at most $32767-257=32510$}
@!max_kerns=5000; {the maximum number of distinct kern values}
@!hash_size=32579; {preferably a prime number, a bit larger than the number
  of character pairs in lig/kern steps}
@z

@x [6] Open PL file.
reset(pl_file);
@y
reset (pl_file, pl_name);
if verbose then begin
  print (banner);
  print_ln (version_string);
end;
@z

@x [16] Open TFM file.
@ On some systems you may have to do something special to write a
packed file of bytes. For example, the following code didn't work
when it was first tried at Stanford, because packed files have to be
opened with a special switch setting on the \PASCAL\ that was used.
@^system dependencies@>

@<Set init...@>=
rewrite(tfm_file);
@y
@ On some systems you may have to do something special to write a
packed file of bytes.  It's no problem in C.
@^system dependencies@>

@<Set init...@>=
rewritebin (tfm_file, tfm_name);
@z

@x [18] Pascal Web's char
@d first_ord=0 {ordinal number of the smallest element of |char|}
@y
@d char == 0..255
@d first_ord=0 {ordinal number of the smallest element of |char|}
@z

@x [79] `index' might be a library routine.
|k|th element of its list.
@y
|k|th element of its list.
@d index == index_var
@z

@x [103] No output (except errors) unless verbose.
@<Print |c| in octal notation@>;
@y
if verbose then @<Print |c| in octal notation@>;
@z

@x [115] Output of reals.
@ @d round_message(#)==if delta>0 then print_ln('I had to round some ',
@.I had to round...@>
  #,'s by ',(((delta+1) div 2)/@'4000000):1:7,' units.')
@y
@ @d round_message(#)==if delta>0 then begin print('I had to round some ',
@.I had to round...@>
  #,'s by '); print_real((((delta+1) div 2)/@'4000000),1,7);
  print_ln(' units.'); end
@z

% [118] Change the name of the variable `class', since AIX 3.1's <math.h>
% defines a function by that name.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d pending=4 {$f(x,y)$ is being evaluated}
@y
@d pending=4 {$f(x,y)$ is being evaluated}
@d class == class_var  {Avoid problems with AIX \.{<math.h>}}
@z

% [123] web2c can't handle these mutually recursive procedures.
% But let's do a fake definition of f here, so that it gets into web2c's
% symbol table...
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p function f(@!h,@!x,@!y:indx):indx; forward;@t\2@>
  {compute $f$ for arguments known to be in |hash[h]|}
@y
@p
ifdef('notdef')
function f(@!h,@!x,@!y:indx):indx; begin end;@t\2@>
  {compute $f$ for arguments known to be in |hash[h]|}
endif('notdef')
@z

% [124] ... and then really define it now.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p function f;
@y
@p function f(@!h,@!x,@!y:indx):indx;
@z

@x [127] Fix up output of bytes.
@d out(#)==write(tfm_file,#)
@y
@d out(#)==putbyte(#,tfm_file)
@z

@x [136] Fix output of reals.
@p procedure out_scaled(x:fix_word); {outputs a scaled |fix_word|}
var @!n:byte; {the first byte after the sign}
@!m:0..65535; {the two least significant bytes}
begin if abs(x/design_units)>=16.0 then
  begin print_ln('The relative dimension ',x/@'4000000:1:3,
    ' is too large.');
@.The relative dimension...@>
  print('  (Must be less than 16*designsize');
  if design_units<>unity then print(' =',design_units/@'200000:1:3,
      ' designunits');
@y
@p procedure out_scaled(x:fix_word); {outputs a scaled |fix_word|}
var @!n:byte; {the first byte after the sign}
@!m:0..65535; {the two least significant bytes}
begin if fabs(x/design_units)>=16.0 then
  begin print('The relative dimension ');
    print_real(x/@'4000000,1,3);
    print_ln(' is too large.');
@.The relative dimension...@>
  print('  (Must be less than 16*designsize');
  if design_units<>unity then begin print(' =');
	print_real(design_units/@'200000,1,3);
	print(' designunits');
  end;
@z

% [141] char_remainder[c] is unsigned, and label_table[sort_ptr].rr
% might be -1, and if -1 is coerced to being unsigned, it will be bigger
% than anything else.
@x
  while label_table[sort_ptr].rr>char_remainder[c] do
@y
  while label_table[sort_ptr].rr>intcast(char_remainder[c]) do
@z

@x [147] Be quiet unless verbose.
read_input; print_ln('.');@/
@y
read_input;
if verbose then print_ln('.');
@z

@x [148] System-dependent changes.
This section should be replaced, if necessary, by changes to the program
that are necessary to make \.{PLtoTF} 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 printed 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
Parse a Unix-style command line.

@d argument_is (#) == (strcmp (long_options[option_index].name, #) = 0)

@<Define |parse_arguments|@> =
procedure parse_arguments;
const n_options = 3; {Pascal won't count array lengths for us.}
var @!long_options: array[0..n_options] of getopt_struct;
    @!getopt_return_val: integer;
    @!option_index: c_int_type;
    @!current_option: 0..n_options;
begin
  @<Initialize the option variables@>;
  @<Define the option table@>;
  repeat
    getopt_return_val := getopt_long_only (argc, argv, '', long_options,
                                           address_of (option_index));
    if getopt_return_val = -1 then begin
      {End of arguments; we exit the loop below.} ;

    end else if getopt_return_val = "?" then begin
      usage ('pltotf');

    end else if argument_is ('help') then begin
      usage_help (PLTOTF_HELP, nil);

    end else if argument_is ('version') then begin
      print_version_and_exit (banner, nil, 'D.E. Knuth', nil);

    end; {Else it was a flag; |getopt| has already done the assignment.}
  until getopt_return_val = -1;

  {Now |optind| is the index of first non-option on the command line.
   We must have one or two remaining arguments.}
  if (optind + 1 <> argc) and (optind + 2 <> argc) then begin
    write_ln (stderr, 'pltotf: Need one or two file arguments.');
    usage ('pltotf');
  end;

  pl_name := extend_filename (cmdline (optind), 'pl');

  {If an explicit output filename isn't given, construct it from |pl_name|.}
  if optind + 2 = argc then begin
    tfm_name := extend_filename (cmdline (optind + 1), 'tfm');
  end else begin
    tfm_name := basename_change_suffix (pl_name, '.pl', '.tfm');
  end;
end;

@ Here are the options we allow.  The first is one of the standard GNU options.
@.-help@>

@<Define the option...@> =
current_option := 0;
long_options[current_option].name := 'help';
long_options[current_option].has_arg := 0;
long_options[current_option].flag := 0;
long_options[current_option].val := 0;
incr (current_option);

@ Another of the standard options.
@.-version@>

@<Define the option...@> =
long_options[current_option].name := 'version';
long_options[current_option].has_arg := 0;
long_options[current_option].flag := 0;
long_options[current_option].val := 0;
incr (current_option);

@ Print progress information?

@<Define the option...@> =
long_options[current_option].name := 'verbose';
long_options[current_option].has_arg := 0;
long_options[current_option].flag := address_of (verbose);
long_options[current_option].val := 1;
incr (current_option);

@
@<Glob...@> =
@!verbose: c_int_type;

@
@<Initialize the option...@> =
verbose := false;

@ An element with all zeros always ends the list.

@<Define the option...@> =
long_options[current_option].name := 0;
long_options[current_option].has_arg := 0;
long_options[current_option].flag := 0;
long_options[current_option].val := 0;

@ Global filenames.

@<Global...@> =
@!tfm_name,@!pl_name:const_c_string;
@z