Both claim to set errno to ERANGE in under/overflow situations. I'm
not seeing that - errno remains unset.
They also say that the functions will return HUGE_VALF or HUGE_VALL
for overflowed float or doubles respectively (or negative values of
same). What they fail to mention is that HUGE_VALF and HUGE_VALL are
defined in math.h.
The SYNOPSIS should include: #include <math.h>
The RETURN VALUE should mention that if errno is supposed to be set
that not all versions of glibc do so. Sadly for underflows
(0.0000000000000000000000000000000001) strto[df] returns 0 and doesn't
set errno so there's no real way to detect an error.
Code to check all this:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int
main(int argc, char *argv[])
{
float n;
char *ns = "9999999999999999999999999999999999999999999999"
"9999999999999999999.9999999999999999",
*err_ns;
n = strtod(ns, &err_ns);
printf("HUGE_VALF: %f\nns: %f\n", HUGE_VALF, n);
perror("errno: ");
}
Kevin
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Kevin Lyda
Galway, Ireland
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