timersub is incorrect for small values

[jur]

timersub is incorrect for small values, defined in sys/time.h

i.e. 0.001000 - 0.001800 gives -1.999200, which is not what my calculator
sais.

Sample.c file below.

Regards,

Jurriaan

#include <stdio.h>
#include <sys/time.h>

int main() {
        struct timeval a,b,c;

        a.tv_sec=0;
        a.tv_usec=1000;

        b.tv_sec=0;
        b.tv_usec=1800;

        timersub(&a,&b,&c);

        printf("lala: %ld.%.6ld\n",c.tv_sec,c.tv_usec);
}