Re: [Plplot-devel] Looking into problem with Ada example 19

[Jerry]

On Aug 31, 2008, at 2:58 PM, Alan W. Irwin wrote:

On 2008-08-31 14:14-0700 Jerry wrote:

My posting of this problem at comp.lang.ada has produced some rather arcanediscussion.

Here is my feeble attempt at C:

There is one school of thought that says that my example, being all Ada, isdifferent than the real code (in PLplot) because plmap in my posted exampleis in Ada where in the real situation it is in C. The discussion revolvesaround how Ada handles calls to Ada subprograms while enforcing C callingconventions versus calls to C subprograms while enforcing C conventions. So, I'm trying to modify the simple example so that plmap is written in C,more closely emulating the PLplot situation. Unfortunately, my C skills arevery poor and I can't get a simplified plmap to compile. My goal is to get itto compile then link to it from Ada.

<snip>

My C skills are not that great, but I think I can help you out.


inserting the lines

#include <stdint.h>
typedef double PLFLT;
typedef int32_t PLINT;

(That first #include #defines what int32_t means [a 32-bit integer
regardless of platform] for C99 compliant systems. If you don't have
stdint.h accessible on your system, then replace int32_t by int).

Then the command

gcc -c plmap.c


of it.

Alan

In plplot.h you have to define the PLINT and PLFLT types. I did that by works for me. The -c option is required because you just want to compile that code and you do not want to link it to make a standalone executable out

Thanks, Alan.



There's a little bash file included.

Jerry

Attached is a zip file that more closely emulates the PLPlot situation, with plmap written in C but with the callback, mapform19, written in Ada. Could a few of you test it to see if it runs or crashes on your machines? Either way, I'd like to report back to the geniuses at comp.lang.ada.

simple_test_case_with_c
Description: Binary data

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