% This is MAKEPROG.CF.IO.TURBO as of 02 May 89 %-------------------------------------------------------- % (c) 1989 by J.Schrod. % % Changefile for I/O handling with Turbo-Pascal (V5.0) % text_char is extended ASCII (up to chr(255)) % text_file must be named text % tab marks should be recognized % binding of external files to internal file variables is not done by the % run time system, therefor reset and rewrite must be done with own % procedures % file name is taken from command line % files are buffered for higher performance % file access is done with a read/write in a string (no get/put available) % files must be closed (???) % @x S 2 @t\4@>@@; @y @t\4@>@@; @t\4@>@@; @z @x S 12 @d last_text_char=127 {ordinal number of the largest element of |text_char|} @y @d last_text_char=255 {ordinal number of the largest element of |text_char|} @z @x S 12 @!text_file=packed file of text_char; @y @!text_file=text; @z @x S 17 for i:=1 to " "-1 do xchr[i]:=' '; @y for i:=1 to " "-1 do xchr[i]:=' '; xchr[tab_mark] := chr(tab_mark); @z @x S 24 reset(doc_file); reset(change_file); @y @< Initialize the Turbo Pascal specific input/output related variables @>; tp_reset(doc_file, 'DOC', doc_buffer); tp_reset(change_file, 'CHF', chf_buffer); @z @x S 26 rewrite(prog_file); @y tp_rewrite(prog_file, prog_ext, prog_buffer); @z @x S 28 [ERROR] function input_ln(var f:text_file):boolean; {inputs a line or returns |false|} var final_limit:0..buf_size; {|limit| without trailing blanks} begin limit:=0; final_limit:=0; if eof(f) then input_ln:=false else begin while not eoln(f) do begin buffer[limit]:=xord[f^]; get(f); incr(limit); if (buffer[limit-1]<>" ") and (buffer[limit-1]<>tab_mark) then final_limit:=limit; if limit=buf_size then begin while not eoln(f) do get(f); decr(limit); {keep |buffer[buf_size]| empty} print_nl('! Input line too long'); error; mark_error; @.Input line too long@> end; end; read_ln(f); limit:=final_limit; input_ln:=true; end; end; @y function input_ln(var f:text_file):boolean; {inputs a line or returns |false|} var s: string; {temporary line storage} final_limit: 0..buf_size+1; {index into |s|} i: 0..buf_size; {index into |buffer|} begin if eof(f) then begin limit := 0; input_ln := false; end else begin read_ln(f,s); final_limit := ord(s[0]); while (final_limit > 0) and ((s[final_limit] = ' ') or (s[final_limit] = xchr[tab_mark])) do decr(final_limit); if final_limit > buf_size+1 then final_limit := buf_size + 1; for i:=0 to final_limit-1 do buffer[i] := xord[s[i+1]]; if final_limit >= buf_size then begin final_limit := buf_size - 1; {keep |buffer[buf_size]| empty} print_nl('! Input line too long'); error; mark_error; @.Input line too long@> end; limit := final_limit; input_ln := true ; end; end; @z @x S 31 {here files should be closed if the operating system requires it} @y close(prog_file); close(doc_file); close(change_file); @z @x procedure put_line; var i: 0..buf_size; begin for i:=0 to limit-1 do write(prog_file, xchr[buffer[i]]); write_ln(prog_file); end; @y procedure put_line; var i: 0..buf_size; s: string; {temporary line storage} begin for i:=0 to limit-1 do s[i+1] := xchr[buffer[i]]; s[0] := chr(limit); write_ln(prog_file, s); end; @z @x S 188 \noindent This module should be replaced, if necessary, by changes to the program that are necessary to make \MAKEPROG{} work at a particular installation. It is usually best to design your change file so that all changes to previous modules preserve the module numbering; then everybody's version will be consistent with the printed program. More extensive changes, which introduce new modules, can be inserted here; then only the index itself will get a new module number. @^system dependencies@> @y \noindent This module should be replaced, if necessary, by changes to the program that are necessary to make \MAKEPROG{} work at a particular installation. It is usually best to design your change file so that all changes to previous modules preserve the module numbering; then everybody's version will be consistent with the printed program. More extensive changes, which introduce new modules, can be inserted here; then only the index itself will get a new module number. @^system dependencies@> @* Resetting and rewriting files. \noindent Turbo Pascal allows the usage of command line parameters but does not connect external files with the internal file variables automatically. Therefore we demand the file name (without extension) in the command line---with this name we can open resp.\ create the files. The real opening of input files is done via |tp_reset| and the creating of output files is done via |tp_rewrite|. Both procedures have two parameters, the file variable and the extension which should be used together with the file name. The extension is passed without a dot. @< Glob... @>= @!file_name: string; @!prog_ext: string; @ But first we have to look at the command line. If there is no parameter present we print a usage message and finish the program afterwards. Here |jump_out| cannot be used because files would be closed that would be not open. @< Initialize the Turbo... @>= if param_count < 1 then begin print('! usage: makeprog [-ext] file_name'); halt; end else begin file_name := param_str(1); if (param_count = 2) and (file_name[1] = '-') then begin prog_ext := copy(file_name, 2, 3); file_name := param_str(2); end else prog_ext := 'PRG'; end; @ @< Type... @>= @!file_buffer=packed array[1..4096] of byte; @ @< Glob... @>= @!doc_buffer:file_buffer; {file buffer for primary input} @!chf_buffer:file_buffer; {file buffer for updates} @!prog_buffer:file_buffer; {file buffer for output} @ If an input file can't be opened we handle it just like a file that is not there. I.e., we use \.{NUL:} as the input file---|eof| will then always return true as presumed by the program. @< Turbo Pascal specific procedures @>= procedure tp_reset( var f: text_file; ext: string; var buf: file_buffer ); begin assign(f, file_name+'.'+ext); @/ @{@=$I-@>@} reset(f); @{@=$I+@>@} if io_result = 0 then settextbuf(f, buf) else begin assign(f, 'NUL'); reset(f); { |eof(f) = true| } end; end; @# procedure tp_rewrite( var f: text_file; ext: string; var buf: file_buffer ); begin assign(f, file_name+'.'+ext); rewrite(f); settextbuf(f, buf); end; @z