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Hi there,

First off "NewLisp" is so awesome, really liking it.

BTW: I am running it on Red Hat Linux 64 bit machine.

Also, I understand NewLisp deals with integers and floats.....but just curious about "doubles"

Quick question that I hope someone can help me with. So below is a very basic "shared lib":

dummy.h

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double doCalc(double x);

dummy.c

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#include <stdio.h>
#include <stdlib.h>

double doCalc(double x){
   double y;
   printf("Number passed in: %fn", x);
   y = x * 2;
   printf("Number multiplied by 2 is: %fn", y);
   return y;
}

I compiled this with simple makefile:

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CC = gcc

all: libdummy.so 

libdummy.so:
	$(CC) -m64 -Wall -g -I./ -c -fPIC ./dummy.c -o ./dummy.o
	$(CC) -m64 -shared -o ./libdummy.so ./dummy.o -L/usr/lib64
	
clean:
	rm ./*.so

Then I enter newlisp on command line:

newLISP v.10.6.0 64-bit on Linux IPv4/6 UTF-8 libffi, options: newlisp -h

> (import "/home/lynton/Desktop/ffi/libdummy.so" "doCalc")

doCalc@7F5D59D2C57C

> (doCalc 8.7)

Number passed in: 8.700000

Number multiplied by 2 is: 17.400000

4625590882276894310

>

Why would the above return 4625590882276894310 to NewLisp when it should have been "17.4"?

Am I doing something stupid here?

Thanks for the help

Lynton

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Messages - lyntongrice

newLISP and the O.S. / Re: Calling shared lib with "double" not working as expected

newLISP and the O.S. / Calling shared lib with "double" not working as expected?