Hi,
This is a re-hash of a question I asked on the XS list a few hours ago. (No replies yet.) It's an issue only with perls built with -Duse64bitint.

Consider the following code and output: 
use warnings;
use Inline C => Config =>
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

int foo(SV * integer) {

     char * str;

     str = SvPV_nolen(integer);

     if(SvIOK(integer)) {
       printf("IV: %s\n", str);
       return 1;
       }

     if(SvNOK(integer)) {
       printf("NV: %s\n", str);
       return 2;
       }

     printf("Neither IV nor NV");
     return 3;
}

EOC

{
use integer;
$x = 2 ** 57 + 12345;
}

$y = 2 ** 57 + 12345;

foo($x);
foo($y);

__END__
Outputs:

IV: 144115188075868217
NV: 1.44115188075868e+17

[download]
Note that 'foo($y)' creates the string "1.44115188075868e+17". I need to make it create the same string as 'foo($x)' does - ie "144115188075868217". How do I do that from within the foo() function ? (I'm not interested in solutions that involve fiddling with the perl side of things.)

Cheers,
Rob

In reply to XS and -Duse64bitint by syphilis

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