Comment 33 for bug 346964

Nope, above doesn't work, this should:

static gboolean
is_env (const char *a,
 const char *b)
{
  while (*a == *b)
  {
    if (*a == 0 || *b == 0 || *b == '=') /* cover naughty equals usage */
      return FALSE;

    a++;
    b++;
  }

  if (*a == '=' && *b == 0)
    return TRUE;

  return FALSE;
}