- Gpc - gnu.de

Editing GPC-source code
by chris＠bockermann.ping.de 02 Nov '97

02 Nov '97

Hi everybody ! Sorry, if this does not really fit to Pascal-related programming, but I think it fits to GPC !? I have a question to all the people working on the improvement of GPC : I want to insert a function of my own, written in C, into GPC. In which file do I have to put it ? For example if I want to insert a function of bpcompat direct into the compiler. Is there any way to do this ? Help would be nice ... -- Bis denn, Chris e-mail > chris(a)bockermann.ping.de ____________________________________ (subject "send pgp-key" for pgp-key)

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Re: Accessing command line arguments example doesn't work
by Peter Gerwinski 01 Nov '97

01 Nov '97

According to Thomas Tan: > I get wierd errors when I try to compile the command line argument example. > First it had a problem with the line (ParamStr := ";), so I changed the " to "" An empty string was meant, so the correct thing would be '', but "" works, too. > Then it said ( cmdline.pas(36) Error: undeclared identifier `Arg_num'" )about > the line > ( Success := _p_paramstr (arg_num, Str);) I don't know what's wrong. Change it to `num', then it should work. The part of the documentation you are referring to is outdated. The packages `BPcompat' and `BO5', both available from ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/contrib/, contain tested, BP-compatible versions of `ParamCount' and `ParamStr'. In addition, I am currently working on making those functions built-in. Hope this helps, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]

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Re: your mail
by Peter Gerwinski 01 Nov '97

01 Nov '97

According to Peter G Purcell: > I am looking for a freeware or shareware pascal compiler. You have found one. :-) Welcome to GNU Pascal and its mailing list! To subscribe to this list, write to gpc-request(a)hut.fi. > Where might I find one, and how may I download it? You can download the official version 2.0 of the GNU Pascal compiler from ftp://kampi.hut.fi/jtv/gnu-pascal/ We also have rather stable beta versions available at ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/beta/ we can recommend you to try. More information, including the GNU Pascal FAQ list, can be found at http://home.pages.de/~GNU-Pascal/ Hope this helps, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]

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None
by ppurcell＠juno.com 01 Nov '97

01 Nov '97

I am looking for a freeware or shareware pascal compiler. Where might I find one, and how may I download it? Thank you for your help. Sincerely, Peter Purcell

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Accessing command line arguments example doesn't work
by Thomas_Tan＠fc.choate.edu 01 Nov '97

01 Nov '97

I get wierd errors when I try to compile the command line argument example. First it had a problem with the line (ParamStr := ";), so I changed the " to " " Then it said ( cmdline.pas(36) Error: undeclared identifier `Arg_num'" )about the line ( Success := _p_paramstr (arg_num, Str);) I don't know what's wrong. Here's the text I found in the Documentation of GPC: <********** begin text here *************> Accessing command line arguments: The following module accesses the command line with ParamStr and ParamCount functions. These follow the Un*x semantics, so that arg[0] == program name, arg[1] .. arg[ParamCount-1] are the arguments. MODULE command_line interface; EXPORT cmdline = (Max_length, Arg_type, ParamStr, ParamCount); CONST Max_length = 255; { Max length of each argument. If some arg is longer, the run time system traps it. } TYPE Arg_type = String(Max_length); FUNCTION ParamCount: Integer; FUNCTION ParamStr (arg_num: integer): Arg_type; END. { command_line interface } MODULE command_line implementation; { These are in the GPC runtime library } FUNCTION _p_paramcount : Integer; C; FUNCTION _p_paramstr (num: Integer; VAR str: String): Boolean; C; FUNCTION ParamCount; BEGIN ParamCount := _p_paramcount; END; { ParamCount } FUNCTION ParamStr; VAR Str : Arg_type; Success : Boolean; BEGIN Success := _p_paramstr (arg_num, Str); (* Should perhaps do something else on failure. * * Now it returns the empty string, which is also a valid * parameter. *) IF Success THEN ParamStr := Str else ParamStr := "; END; { ParamStr } END. { command_line implementation } { The program below, when compiled with the interface module and linked with the implementation module, accesses the command line arguments. } program zap (output); import cmdline; var counter : integer; begin writeln ('Program fetches command line arguments and outputs one per line'); writeln ('Max length of each argument is ',Max_Length:1,' characters'); for counter := 0 to ParamCount-1 do writeln ('Command line arg ',counter:1,' is "',paramstr(counter),'"'); end. <******************end text here****************> ------------------------------------------------------ This message sent using the FirstClass SMTP/NNTP Gateway. From: Choate Rosemary Hall 333 Christian St. Wallingford, CT. 06492

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Re: File Handling
by Peter Gerwinski 01 Nov '97

01 Nov '97

According to Thomas Tan: > I need to create a new text file, put some string in it, and save it to disk. Is > this possible in GPC? With gpc-971001 you can do it just like with Borland Pascal: Program Hello; Var MyFile: Text; S: String [ 42 ]; begin S:= 'Hello, world!'; Assign ( MyFile, 'hello.dat' ); rewrite ( MyFile ); writeln ( MyFile, S ); close ( MyFile ); end. Hope this helps, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]

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Re: Editing GPC-source code
by Peter Gerwinski 01 Nov '97

01 Nov '97

According to Christian Bockermann: > > Sorry, if this does not really fit to Pascal-related programming, but I think it > fits to GPC !? Perfectly. :) > I have a question to all the people working on the improvement of GPC : > I want to insert a function of my own, written in C, into GPC. In which > file do I have to put it ? For example if I want to insert a function > of bpcompat direct into the compiler. Is there any way to do this ? While one can easily fill books with this topic, here is a short description what to do: * Locate your file in the `rts' subdirectory of the GPC source tree. (It may be written in C, Pascal, or any other GNU language, BTW.) * Edit `rts/Makefile.in', so your file will be compiled and included into `libgpc.a', GPC's run-time library. * In `util.c', add your routine to the `KItable'. * In `parse.y', assign a token to your routine, make it `%type <ttype>', add it to `new_identifier_1', so the identifier remains redefinable, and - implement it. For this last point, look at an existing routine which is called in a similar way as yours (`Assign', for instance, is a good example). * If your implementation in `parse.y' is through `rts_proc_parlist' or similar, the actual work will be done in `build_rts_call()'. So you will have to edit `rts.c' and to add your routine to the big `switch' statement in `build_rts_call()'. Depending on what you intend to implement, this can be quite easy or a nightmare. Again, look at an existing feature that is called in a similar way as yours. * Everywhere within GPC you will have to deal with so-called "tree nodes". I have written a short introduction to those things and more - see the chapter "GPC source" of the GPC online documentation. Good luck! If you succeed or have further questions, please let us know! Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]

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File Handling
by Thomas_Tan＠fc.choate.edu 31 Oct '97

31 Oct '97

I need to create a new text file, put some string in it, and save it to disk. Is this possible in GPC? ------------------------------------------------------ This message sent using the FirstClass SMTP/NNTP Gateway. From: Choate Rosemary Hall 333 Christian St. Wallingford, CT. 06492

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Re: gpc beta
by Peter Gerwinski 31 Oct '97

31 Oct '97

Hi, Richard; hi, all! > I have just downloaded gpc beta for installation on a debian 1.3.1 > system. I may become the new debian gpc maintainer, within the next > month. Good to know. Thanks. I was reported (did not check by myself) that current Debian distributions of GPC suffer from the problem that the GPC run-time library, a shared library in Debian, is not symlinked correctly: The symlink libgpc.so -> libgpc.so.2 is missing in `/usr/lib'. It would be a good idea to correct this in future distributions. Have fun, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]

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Re: us_Timer in TimeStamp
by Frank Heckenbach 31 Oct '97

31 Oct '97

Jesper Lund wrote: > Apart from the fact that this is DJGPP-specific, there is another caveat. > The documentation states that the use of `uclock' *may* (on some systems) > interfere with the proper working of the system time. Oh well... :-( So, perhaps it's better to use just the 1/18.2 s system clock then... > I understand the need for something like Randomize in game programming (I > guess I am thinking too much about scientific purposes). But, as Peter > pointed out, the program should only call Randomize once (at the beginning), > and rely on repeated calls to the Random function to generate a sequence of > numbers that -- for all practical purposes -- looks random. In that case, > using hours, minutes and seconds from the system time, or the Unix approach > with GetPID, should be perfectly satisfactory. > > I may be missing something (I *am* totally ignorant about game programming), > but to me the discussion about lack of randomness unless 1/100 or 1/1000 > seconds are used sounds like calling Randomize before *each* call to Random? I think so. However, 1 second may be a bit too long for short command line programs that use random (perhaps a fortune teller). A user could call the program more than once a second. (Though this doesn't seem to be a big problem.) -- Frank Heckenbach, Erlangen, Germany heckenb(a)mi.uni-erlangen.de http://home.pages.de/~fjf/links.htm

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