Locale independent strtod

strtod.c

#if defined(_OS_WINDOWS_)

#include <stdlib.h>
#include <locale.h>

// Cache locale object
static int c_locale_initialized = 0;
static _locale_t c_locale;

_locale_t get_c_locale()
{
  if(!c_locale_initialized)
  {
    c_locale_initialized = 1;
    c_locale = _create_locale(LC_ALL,"C");
  }
  return c_locale;
}

double strtod_c(const char *nptr, char **endptr)
{
  return _strtod_l(nptr, endptr, get_c_locale());
}

#else

#include <stdlib.h>
#include <xlocale.h>

// Cache locale object
static int c_locale_initialized = 0;
static locale_t c_locale;

locale_t get_c_locale()
{
  if(!c_locale_initialized)
  {
    c_locale_initialized = 1;
    c_locale = newlocale(LC_ALL_MASK, NULL, NULL);
  }
  return c_locale;
}

double strtod_c(const char *nptr, char **endptr)
{
  return strtod_l(nptr, endptr, get_c_locale());
}

#endif

Please change

   c_locale = newlocale(LC_ALL_MASK, NULL, NULL);

with

   c_locale = newlocale(LC_ALL_MASK, "C", NULL);

on line 39. Otherwise c_locale will be set to 0 and passing 0 to strtod_l will cause crash (at least in my glibc implementation).