Gpc August 1997

gpc@gnu.de

23 participants
88 discussions

Re: curses suggestions wanted
by Frank Heckenbach 07 Aug '97

07 Aug '97

Peter Gerwinski wrote: > In such situations, where the procedure/function does not change the > parameter, you can declare it with a `PChar' parameter. GPC knows what > to do if the user passes a String schema and implicitly passes the address > of the string data instead of the address of the schema. But it doesn't add a #0 terminator, so the result may be wrong, as in the following program: program x; {$x+} procedure p(x:pchar); begin writeln(x) end; var x:string(10)='abc'; begin x:='x'; p(x) end.

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Re: curses suggestions wanted
by Peter Gerwinski 07 Aug '97

07 Aug '97

According to Ken Linder: > > I have come across a problem (bug? feature?) trying to pass a string schema > parameter to a procedure with a parameter defined as a __cstring__. Please > note that I am still using ver 2.0 so if this is fixed in the newer version, > let me know. Here is the problem: It is fixed. Also the problem which occured with `foofoo' in a Unit. Since there are more bugs with `CString' in gpc-2.0, I suggest you to upgrade to gpc-970714. > [...] The way I understand linking to a C rtn like: > function cfoo(SomeNum : integer) : integer; C; > requires that I link a C library that contains a function called `cfoo'. Function CFoo ( SomeNum: Integer ): Integer; AsmName 'foo'; together with the Pascal version Function Foo ( SomeNum: Integer ): Integer; (* yields 'Foo' *) solves the problem. Greetings, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

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Re: curses suggestions wanted
by Ken Linder 07 Aug '97

07 Aug '97

Hi all, I have come across a problem (bug? feature?) trying to pass a string schema parameter to a procedure with a parameter defined as a __cstring__. Please note that I am still using ver 2.0 so if this is fixed in the newer version, let me know. Here is the problem: This program works: 8<-------------------------------------------------- program works1; (* GPC 2.0 *) procedure foo(abar : __cstring__); begin (* dummy proc *) end; var blab : string (200); begin blab := 'Test Me'; foo(blab); end. 8<-------------------------------------------- However, the following program does not. I get the following error when trying to compile: dwork1.pas: In function 'program_Dwork1': dwork1.pas:16:incompatible type for argument 1 of 'Foo' 8<--------------------------------------------- program dwork1; (* GPC 2.0 *) type aCString = __cstring__; procedure foo(abar : aCString); begin (* dummy proc *) end; var blab : string (200); begin blab := 'Test Me'; foo(blab); end. 8<------------------------------------------ Also, if I define a proc in a unit like: procedure foofoo(acstr : __cstring__); and call it from a different program like: foofoo(SomeStrSchema); I get the same error as above DWORK1.PAS program. ******************************************************* Regarding the Pascal -vs- C calling, I like your suggestion, Peter. I would much rather have the string variant be the default but provive the bare ncurses calls just in case. However, the naming may need to be like: pfoo() and cfoo(). The way I understand linking to a C rtn like: function cfoo(SomeNum : integer) : integer; C; requires that I link a C library that contains a function called `cfoo'. If I could specify a different C fcn name to link to ( I think this was discussed before) I could call the procedures almost anything! Thanks much!!! Ken L.

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Re: HI !
by Peter Gerwinski 06 Aug '97

06 Aug '97

> Hello ! Hello as well! > First, I want to thank you for this AWEsome Pascal compiler, > I love it ! Good. That's a good reason for us to go on! :-) > I have made a little program to play WAV file on SB16.Can I send it > to you ? , if yes , where ? You can upload it to ftp://agnes.dida.physik.uni-essen.de/incoming. As far as I understand "on SB16.Can" this program is specialized to the DJGPP platform with a SB16-compatible sound card, correct? What are your licensing terms? GNU GPL/LGPL (recommended)? If you have a README for your program, we could place it next to it. > For instance I use GPC with rhide, when the new IDE is available ? You mean: a new version of RHIDE? I don't know. Ask Robert Hoehne at the DJGPP newsgroup, news://comp.os.msdos.djgpp. I am sending this e-mail twice: One to yourself and one to the GPC mailing list. Since the list is maintained manually, it is probable that you are not yet subscribed to it, but this will happen soon. Greetings, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

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HI !
by cagliostro 06 Aug '97

06 Aug '97

Hello ! First, I want to thank you for this AWEsome Pascal compiler, I love it ! secondly, I want to subscribe to the mailing list I have made a little program to play WAV file on SB16.Can I send it to you ? , if yes , where ? For instance I use GPC with rhide, when the new IDE is available ? I know your time is precious, so I can be eager. Thanks again and bye Patrice BOUCHAND

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Re: curses suggestions wanted
by Peter Gerwinski 06 Aug '97

06 Aug '97

According to Ken Linder: > > While working on a curses (ncurses) interface I have come upon a situation > whereby I need some directions from potential GPC ncurses users. Certain > ncurses functions require a PCHAR pointing to a string for the function to > use. Would you, the potential users, rather pass a string schema instead? Yes, but this is no real problem (see below). > Personaly I would like an ncurses lib where I only pass strings when I can. > > Any ideas or suggestions? > > I could also allow either type of call... > > C style: > addstr(PChar); > > GPC style > gaddstr(String); In such situations, where the procedure/function does not change the parameter, you can declare it with a `PChar' parameter. GPC knows what to do if the user passes a String schema and implicitly passes the address of the string data instead of the address of the schema. OTOH if the String is in fact a `Var' parameter (I don't know if such functions exist in [n]curses), you must decide whether this shall be a `PChar' or a String schema. In such cases I would prefer to have the `String' variant as the default and the `PChar' variant as an extensions, i.e. C style: Procedure cfoo ( Var S: pChar ); GPC style: Procedure foo ( Var S: String ); (* NB: You needn't specify the length of the string in `Var' parameters, but you must do so for the return value of a function. *) Greetings, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

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Some patches
by Peter Gerwinski 06 Aug '97

06 Aug '97

Hello, everybody! I uploaded four patches from gpc-970714 to the "current state of the art", gpc-970806, to ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/beta. A detailed list of changes will follow with the next beta release. While there are only minor changes (bug fixes) to GPC, I started to make up the documentation crucially; comments are welcome. Greetings, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

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curses suggestions wanted
by Ken Linder (KC7RAD) 06 Aug '97

06 Aug '97

Hi all, While working on a curses (ncurses) interface I have come upon a situation whereby I need some directions from potential GPC ncurses users. Certain ncurses functions require a PCHAR pointing to a string for the function to use. Would you, the potential users, rather pass a string schema instead? Personaly I would like an ncurses lib where I only pass strings when I can. Any ideas or suggestions? I could also allow either type of call... C style: addstr(PChar); GPC style gaddstr(String); Later... Ken L.

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attribute(section(".ltext)) segfault
by Bill Currie 06 Aug '97

06 Aug '97

:) Why's it always me that finds the seg-faults? :) The test on line 534 of gpc-common.c segfaults due to `args' (?) not being what's expected. I had a look at the attribute handling in parse.y, but couldn't figure it out myself, so I've attached an offending file. Also, how the heck do I get attribute() to work with variables? I keep getting parse errors or other wierdnesses. Bill -- Leave others their otherness. The following section of this message contains a file attachment prepared for transmission using the Internet MIME message format. If you are using Pegasus Mail, or any another MIME-compliant system, you should be able to save it or view it from within your mailer. If you cannot, please ask your system administrator for assistance. ---- File information ----------- File: foo.pas Date: 6 Aug 1997, 17:20 Size: 111 bytes. Type: Program-source

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bison and flex with GPC
by Peter Gerwinski 05 Aug '97

05 Aug '97

According to Tom Dye: > > Please excuse a newbie request for help. I'm interested in using a lexer > prepared with flex in a GPC program. I gather from the documentation that > this is possible, but I'm not enough of a C programmer to figure out how > it might be done. This is a special case of the question "How to use a function written in C from a GPC program?", correct? This is answered in the GPC FAQ: 8< ---- begin (* from the GPC FAQ *) ----------------------------------------- [15]How do I use <insert_your_function_here> from the C library? GNU Pascal can use every function of your C library, but it may be up to you to write declaration of an external function, before you can use it. Consider the function `sleep'. `man(3) sleep' reveals: --------------------------------------------------------- NAME sleep - Sleep for the specified number of seconds SYNOPSIS #include <unistd.h> unsigned int sleep(unsigned int seconds); --------------------------------------------------------- This small demo program shows how to use `sleep' in a Pascal program: --------------------------------------------------------- program SleepDemo; type word = __unsigned__ integer; function sleep(seconds: word): word; C; var result : word; begin result := sleep(10); end. ---------------------------------------------------------- 8< ---- end (* from the GPC FAQ *) ------------------------------------------- Remark: Recent beta versions of GPC (available at ftp://agnes.dida.physik.uni-essen.de/~gnu-pascal/beta/) don't need `word = __unsigned__ integer' any more; they have `word' 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/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

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Gpc August 1997