[Bug libc/23007] New: strtod cannot handle -nan

[hermantenbrugge at home dot nl]

https://sourceware.org/bugzilla/show_bug.cgi?id=23007

            Bug ID: 23007
           Summary: strtod cannot handle -nan
           Product: glibc
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hermantenbrugge at home dot nl
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The following code:

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

int
main(void)
{
  double d;

  printf ("%g\n", strtod ("nan", NULL));
  printf ("%g\n", strtod ("-nan", NULL));
  sscanf ("nan", "%lg", &d); printf ("%g\n", d);
  sscanf ("-nan", "%lg", &d); printf ("%g\n", d);
  return 0;
}

produces after compiling and running:

nan
nan
nan
-nan

I was expecting the same result from strtod and sscanf for -nan.

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