% vptovf.ch for C compilation with web2c. @x [0] WEAVE: print changes only. \pageno=\contentspagenumber \advance\pageno by 1 @y \pageno=\contentspagenumber \advance\pageno by 1 \let\maybe=\iffalse \def\title{VP$\,$\lowercase{to}$\,$VF changes for C} @z @x [1] Define my_name @d banner=='This is VPtoVF, Version 1.6' {printed when the program starts} @y @d my_name=='vptovf' @d banner=='This is VPtoVF, Version 1.6' {printed when the program starts} @z @x [2] Print all terminal output on stderr. @d print(#)==write(#) @d print_ln(#)==write_ln(#) @y @d print(#)==write(stderr,#) @d print_ln(#)==write_ln(stderr,#) @d print_real(#)==fprint_real(stderr,#) @z @x [2] Print the banner later. procedure initialize; {this procedure gets things started properly} var @@/ begin print_ln(banner);@/ @y @ procedure initialize; {this procedure gets things started properly} var @@/ begin kpse_set_program_name (argv[0], my_name); parse_arguments; @z @x [3] Increase 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} @!vf_size=10000; {maximum length of |vf| data, in bytes} @!max_stack=100; {maximum depth of simulated \.{DVI} stack} @!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} @!vf_size=100000; {maximum length of |vf| data, in bytes} @!max_stack=100; {maximum depth of simulated \.{DVI} stack} @!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 VPL file. reset(vpl_file); @y reset (vpl_file, vpl_name); if verbose then begin print (banner); print_ln (version_string); end; @z @x [22] Open output files. @ 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@> @= rewrite(vf_file); rewrite(tfm_file); @y @ On some systems you may have to do something special to write a packed file of bytes. @^system dependencies@> @= rewritebin (vf_file, vf_name); rewritebin (tfm_file, tfm_name); @z @x [24] 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 [31] Non-zero return code in case of problems. @!chars_on_line:0..8; {the number of characters printed on the current line} @y @!chars_on_line:0..8; {the number of characters printed on the current line} @!perfect:boolean; {was the file free of errors?} @z @x [32] Non-zero return code in case of problems. chars_on_line:=0; @y chars_on_line:=0; perfect:=true; {innocent until proved guilty} @z @x [33] Non-zero return code in case of problems. chars_on_line:=0; @y chars_on_line:=0; perfect:=false; @z % [89] `index' is not a good choice for an identifier on Unix systems. % Neither is `class', on AIX. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% @x |k|th element of its list. @y |k|th element of its list. @d index == index_var @d class == class_var @z @x [118] No output unless verbose. @; @y if verbose then @; @z @x [144] Output of real numbers. @ @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 @x [152] Fix up the mutually recursive procedures a la pltotf. @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 @x [153] Finish fixing up f. @p function f; @y @p function f(@!h,@!x,@!y:indx):indx; @z @x [156] Change TFM-byte output to fix ranges. @d out(#)==write(tfm_file,#) @y @d out(#)==putbyte(#,tfm_file) @z @x [165] 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 @x [175] Change VF-byte output to fix ranges. @d vout(#)==write(vf_file,#) @y @d vout(#)==putbyte(#,vf_file) @z @x [181] Be quiet unless verbose. read_input; print_ln('.');@/ @y read_input; if verbose then print_ln('.'); @z @x [181] Non-zero return code in case of problems, end. @y if not perfect then uexit(1); end. @z @x [182] System-dependent changes. This section should be replaced, if necessary, by changes to the program that are necessary to make \.{VPtoVF} 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) @ = 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 @; @; repeat getopt_return_val := getopt_long_only (argc, argv, '', long_options, address_of (option_index)); if getopt_return_val = -1 then begin do_nothing; {End of arguments; we exit the loop below.} end else if getopt_return_val = "?" then begin usage (my_name); {|getopt| has already given an error message.} end else if argument_is ('help') then begin usage_help (VPTOVF_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 to three remaining arguments.} if (optind + 1 <> argc) and (optind + 2 <> argc) and (optind + 3 <> argc) then begin write_ln (stderr, my_name ,': Need one to three file arguments.'); usage (my_name); end; vpl_name := extend_filename (cmdline (optind), 'vpl'); if optind + 2 <= argc then begin {Specified one or both of the output files.} vf_name := extend_filename (cmdline (optind + 1), 'vf'); if optind + 3 <= argc then begin {Both.} tfm_name := extend_filename (cmdline (optind + 2), 'tfm'); end else begin {Just one.} tfm_name := make_suffix (cmdline (optind + 1), 'tfm'); end; end else begin {Neither.} vf_name := basename_change_suffix (vpl_name, '.vpl', '.vf'); tfm_name := basename_change_suffix (vpl_name, '.vpl', '.tfm'); end; end; @ Here are the options we allow. The first is one of the standard GNU options. @.-help@> @ = 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@> @ = 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? @.-verbose@> @ = 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); @ The global variable |verbose| determines whether or not we print progress information. @ = @!verbose: c_int_type; @ It starts off |false|. @ = verbose := false; @ An element with all zeros always ends the list. @ = 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. @ = @!vpl_name, @!tfm_name, @!vf_name:const_c_string; @z