Handle NaN arguments in fac and ncr, fixes London Blue Route Map

Author: Launch Pad Stage

tinyexpr.c

@@ -125,7 +125,7 @@ void te_free(te_expr *n) {
 static double pi(void) {return 3.14159265358979323846;}
 static double e(void) {return 2.71828182845904523536;}
 static double fac(double a) {/* simplest version of fac */
- if (a < 0.0)
+ if (!(a >= 0.0))
  return NAN;
  if (a > UINT_MAX)
  return INFINITY;
@@ -139,7 +139,7 @@ static double fac(double a) {/* simplest version of fac */
  return (double)result;
 }
 static double ncr(double n, double r) {
- if (n < 0.0 || r < 0.0 || n < r) return NAN;
+ if (!(n >= 0.0) || !(r >= 0.0) || n < r) return NAN;
  if (n > UINT_MAX || r > UINT_MAX) return INFINITY;
  unsigned long int un = (unsigned int)(n), ur = (unsigned int)(r), i;
  unsigned long int result = 1;