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Hi,

Replying to my own mail:

I was hoping to debug the problem by compiling my test program =20
alongside  strtod.c from libc with debug options and tracing what was =20=

happening.
But doing this, strtod DOES underflow....

I guess I'll have to build a debugging libc...

Any directions for doing this ?

Regards,

R=E9mi Zara

Le 20 d=E9c. 04, =E0 23:19, R=E9mi Zara a =E9crit :

> Hi,
>
> Some postgresql regression tests fail on 2.0 mac68k because some =20
> double values do not undeflow.
> (see for regression test log =20
> http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=3Dosprey&dt=3D2004-12=20=

> -20%2005:00:21)
>
> Here is a test program:
>
> test.c:
>
> #include <stdlib.h>
> #include <errno.h>
>
> int main() {
>         double res;
>         double zero =3D 0.0;
>         char *small =3D "10e-400";
>         res =3D strtod(small,NULL);
>         printf("%e, %d\n", res, errno);
>         if (res =3D=3D zero) {
>                 printf("res =3D=3D zero\n");
>         }
> }
>
> the output is:
> #test
> 0.000000e+00, 0
> res =3D=3D zero
>
> So strtod returned 0, but did not set errno to ERANGE (34)
>
> testing shows that 10e400 overflows, but to underflow, one must go to =20=

> as little as 10e-512 (10e-511 shows the same result as 10e-400).
>
> So is there a bug in NetBSD's strtod ?
> Is something wrong with the test program ?
>
> Regards,
>
> R=E9mi Zara
> --
> R=E9mi Zara
> http://www.remi-zara.net/
--
R=E9mi Zara
http://www.remi-zara.net/

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