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Re: CStrings
by The African Chief 28 Apr '97

28 Apr '97

On Sun, 27 Apr 1997 17:34:47 +0200 (MET DST) Peter Gerwinski <peter(a)agnes.dida.physik.uni-essen.de> wrote: >Hello, > >I encountered some problems with Procedures accepting `CString' >parameters. When passing a string constant to such a parameter, GPC >does *not* automatically add a "chr ( 0 )" terminator. > >Should it do? I personally think so. >And if so, in which cases? "In all cases", I would venture to say. > We always can explicitly write "foo ( … [View More]

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Re: CStrings
by Berend de Boer 28 Apr '97

28 Apr '97

You wrote: >I encountered some problems with Procedures accepting `CString' >parameters. When passing a string constant to such a parameter, GPC >does *not* automatically add a "chr ( 0 )" terminator. I think it should. Much less confusing, probably more portable and in Extended Pascal #0 is not recognized, so means a few characters more typing pain. Another solution, whith less performance impact would be to always add a chr(0) to a string constant at compile time. I think I favor … [View More]

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Legal Change in GPC ?
by C.WENDT＠CHATEAU.cl.sub.de 28 Apr '97

28 Apr '97

Am 25.04.97 konnte ich meine Finger einfach nicht von der Tastatur fernhalten... Folgendes kam dabei heraus: Hallo! I wondered how to implement the ability to change colours and write text to Standard output - but I think it's nearly impossible to do this within a Unit - the C - Textcolor doesn't work with the fprintf function that is used in the RTS... I wondered wether it would be legal (in sense of portability and compability...) to change the RTS : Textcolor works if you check … [View More]

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passing pointers, GPC documentation
by Peter Gerwinski 27 Apr '97

27 Apr '97

According to skye: > > Yes, I can get that to work but what still fails is when gBuffer is > allocated using new(): > [...] > ScreenBlit( gBuffer); (* crashes in the movedata() from the std C lib *) Again: How did you declare the "ScreenBlit" procedure? > Now I'm not too sure how memory allocation works under pascal. Is this > right? I don't have many examples to got from and they all work something > like this. would this be the same as this in C: > > char* … [View More]gBuffer; > gBuffer = malloc(320*200); > free(gBuffer); Yes. > now I haven't seen GetMem before. The examples I'm using just use the > method i've shown above. Does GetMem work like malloc() where I can specify > the amount at runtime? (this would be nice). Yes. `GetMem' is a Borland Pascal extension: GetMem ( gBuffer, 320 * 200 ); FreeMem ( gBuffer, 320 * 200 ); GPC also allows the following: gBuffer:= GetMem ( 320 * 200 ); FreeMem ( gBuffer ); (* 2. parameter is optional in GPC *) > Also, isn't there a limit to the amount of static variable memory I can use > (DS)? No. > I don't want to have to fidle with my compiler options to increase > it. If I have a static array that is 64k there is potental for probles way > down the road, esp. if I have other large static structres. Feel free to allocate static structures of 1MB or above. This is one reason why I am using GPC rather than BP for scientific programs. (-: > Sorry about the basic Pascal questions. It is strange switching from C/C++ > to Pascal without documentation. I keep trying to do something one way and > find out after much frustration that is done another in Pascal. I have only > a few Pascal DOCS I have found online and they all use TP. Are there any > using GPC? AFAIK, the only existing GPC documentation is our info documentation and the GPC FAQ. You can find both in your GPC distribution, or online at http://home.pages.de/~GNU-Pascal/gpc-doc.html http://home.pages.de/~GNU-Pascal/gpc-faq.html If anybody wants to help to create more documentation, I suggest the following: Collect all this information from this list, e.g. the `GetMem' stuff above, put it into a reasonable structure, and add it to the GNU Texinfo documentation. If you have any questions, be sure that I will help you. Like this, the reference will be made available as on-line help, e.g. with Ctrl+F1 when using the RHIDE. I am starting to do this *now* by writing something about Integer types. It is appended below, so you have an example what I am speaking of and would like to recieve. If you have more ideas, e.g. to write something about `writeln', just do it and post it here! 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 [970420] - http://home.pages.de/~gnu-pascal/ [970125] 8< --------------------------------------------------------------------------- @node Integer @subsection Integer @cindex Integer types GNU Pascal supports the following Integer types: @table @samp @item ByteInt signed 8-bit integer type, @samp{-128..128} @item Byte unsigned 8-bit integer type, @samp{0..255} @item ShortInt signed 16-bit integer type, @samp{-32768..32767} @item ShortWord unsigned 16-bit integer type, @samp{0..65535} @item Integer signed 32-bit integer type, @samp{-2147483648..2147483647} @item Word unsigned 32-bit integer type, @samp{0..4294967295} @item LongInt signed 64-bit integer type, @samp{-9223372036854775808..9223372036854775807} @item LongWord unsigned 64-bit integer type, @samp{0..18446744073709551615} @end table ISO Pascal defines only @samp{Integer}; the other types are GNU extensions. Some of these types (@samp{Byte}, @samp{ShortInt}, @samp{Word}, and @samp{LongInt}) are available in Borland Pascal, too, but have a different size there. For sake of compatibility to Borland Pascal, @samp{LongInt} can also be called @samp{Comp}. On the i386 processor family, operations with @samp{Integer} usually work faster than operations with shorter integer types like @samp{ShortInt} or @samp{ByteInt}. @strong{Known bug:} At the moment, GPC's run time library is not able to @samp{write} or @samp{writeln} integer types longer than @samp{Integer}. @c ---------------------------------------------------------------------------- @node LongInt @subsection LongInt @samp{LongInt} is GPC's signed 64-bit integer type, @samp{-9223372036854775808..9223372036854775807}. For sake of compatibility to Borland Pascal, @samp{LongInt} can also be called @samp{Comp}. @xref{Integer} @xref{LongWord} @xref{Comp} @c ---------------------------------------------------------------------------- @node LongWord @subsection LongWord @samp{ByteInt} is GPC's unsigned unsigned 64-bit integer type, @samp{0..18446744073709551615}. @xref{Integer} @xref{LongInt} @c ============================================================================ [View Less]

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Re: Modifying string length?
by Peter Gerwinski 27 Apr '97

27 Apr '97

According to Frank Heckenbach: > > Is there a way to change a string's length directly? AFAIK, there isn't. Use the `SubStr' function (like BP's `copy' function) to shorten a string, and the `+' operator to make it longer. And of course you can take a pointer to the string, cast it to a pointer to a record the fields of which you can manipulate like you wish ... > BTW: Are the TP string routines (e.g. Insert, Delete) already ported to gpc? The African Chief is working on this. (-… [View More]

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Re: New Alpha: EMX run time library broken?
by Kevin A. Foss 27 Apr '97

27 Apr '97

On Wed, 23 Apr 1997 21:47:37 +0200 (MET DST), Peter Gerwinski wrote: >I was reported that the EMX run time library of the latest alpha GPC >(gpc-970420) is broken: Not even `hello.pas' can be linked. > >Since I cannot reproduce the error on my own system (I can link even >more complicated EMX programs here ... :-) I ask whether somebody else >has observed the same problem. Perhaps there is a bug which only shows >up in some configurations ... Well I was the one who … [View More]

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CStrings
by Peter Gerwinski 27 Apr '97

27 Apr '97

Hello, I encountered some problems with Procedures accepting `CString' parameters. When passing a string constant to such a parameter, GPC does *not* automatically add a "chr ( 0 )" terminator. Should it do? And if so, in which cases? We always can explicitly write "foo ( 'bar'#0 );" instead of just "foo ( 'bar' );", so I tend to let things like they are ... Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski(a)uni-essen.de - http://home.… [View More]

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Re: errors when passing pointers from a unit
by Peter Gerwinski 27 Apr '97

27 Apr '97

According to skye: > > var > gBuffer"^mode13VideoBuffer; You mean: gBuffer: ^mode13VideoBuffer;-). > [...] > All my graphic functions draw to this buffer. To get it to the screen I > have a procedre that calls an external C function: > procedure gUpdate; > begin > screenblit( gBuffer); > end; How is this C function declared in the Pascal program? As "Procedure ScreenBlit ( gBuffer: Pointer ); C;"? Then it should work. > [...] > This only crashes when … [View More]

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Modifying string length?
by Frank Heckenbach 27 Apr '97

27 Apr '97

Hi everybody! Is there a way to change a string's length directly? "s.length:=..." doesn't work, neither (obviously) "length(s):=...". But I think it's necessary in order to implement some low-level string manipulation routines efficiently. BTW: Are the TP string routines (e.g. Insert, Delete) already ported to gpc? -- Frank Heckenbach, Erlangen, Germany heckenb[No_Spam! Remove this to reply.](a)mi.uni-erlangen.de Turbo Pascal: http://www.mi.uni-erlangen.de/~heckenb/programs.htm … [View More]

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Combining C and Pascal source. (Was: Const conflict.)
by Peter Gerwinski 26 Apr '97

26 Apr '97

Frank Heckenbach wrote: > > > If I compile it with "gpc foo.pas bar.c", it works fine. But if I do > > > "gpc bar.c foo.pas", it doesn't ("Undefined references" to the C functions). > > [...] > I don't think that's the problem. I tried invocing ld manually, and it worked > whether bar.o was put before or after the Pascal .o's. > [...] > So, probably this has got something to do with the left over .gpc file... 1. I cannot reproduce this error. :-( On my … [View More]system, "gpc foo.pas bar.c" and "gpc bar.c foo.pas" both work fine - on DJGPP as well as on Linux. This will be hard to fix. 2. I think I have found the problem: :-) The `gpc' driver program assumes that the first input file is a Pascal source when doing `--automake'. I fixed this in `gcc.c'; please retry with the next Alpha GPC. (A diff for `gcc.c' is appended below.) 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 [970420] - http://home.pages.de/~gnu-pascal/ [970125] 8< --------------------------------------------------------------------------- --- gpc-970420/gcc.c Fri Apr 18 12:46:41 1997 +++ gpc/gcc.c Sat Apr 26 10:56:14 1997 @@ -4994,25 +4994,36 @@ obstack_grow (&collect_obstack, "\0", 1); putenv (obstack_finish (&collect_obstack)); #ifdef GPC - /* Substitute the basename of the first input file for %b in - link_command_spec. */ + /* Substitute the basename of the first Pascal + * input file for %b in link_command_spec. + */ + i = 0; + while (i < n_infiles + && infiles[i].language + && strcmp (infiles[i].language, "p") != 0 + && strcmp (infiles[i].language, "pas") != 0) + {fprintf (stderr, "%d\n", i); i++;} + if (i < n_infiles) + { + input_basename = infiles[i].name; + for (p = input_basename; *p; p++) + if (*p == '/') + input_basename = p + 1; - input_basename = infiles[0].name; - for (p = input_basename; *p; p++) - if (*p == '/') - input_basename = p + 1; + /* Find a suffix starting with the last period, + * and set basename_length to exclude that suffix. + */ + basename_length = strlen (input_basename); + p = input_basename + basename_length; + while (p != input_basename && *p != '.') + p--; + if (*p == '.' && p != input_basename) + basename_length = p - input_basename; - /* Find a suffix starting with the last period, - and set basename_length to exclude that suffix. */ - basename_length = strlen (input_basename); - p = input_basename + basename_length; - while (p != input_basename && *p != '.') --p; - if (*p == '.' && p != input_basename) - basename_length = p - input_basename; - - explicit_link_files = add_automake_files (explicit_link_files); + explicit_link_files = add_automake_files (explicit_link_files); + } #endif /* GPC*/ value = do_spec (link_command_spec); if (value < 0) [View Less]

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