prevent CNAME/PTR parsing from reading data past the response end

[musl] / src / math / acoshl.c

diff --git a/src/math/acoshl.c b/src/math/acoshl.c
index 472c71c..8d4b43f 100644 (file)
--- a/src/math/acoshl.c
+++ b/src/math/acoshl.c
@@ -9,17 +9,21 @@ long double acoshl(long double x)
 /* acosh(x) = log(x + sqrt(x*x-1)) */
 long double acoshl(long double x)
 {
-       union {
-               long double f;
-               struct{uint64_t m; int16_t se; uint16_t pad;} i;
-       } u = {.f = x};
+       union ldshape u = {x};
+       int e = u.i.se & 0x7fff;
 
-       if (u.i.se < 0x3fff + 1)
-               /* x < 2, invalid if x < 1 or nan */
+       if (e < 0x3fff + 1)
+               /* |x| < 2, invalid if x < 1 or nan */
                return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1)));
-       if (u.i.se < 0x3fff + 32)
-               /* x < 0x1p32 */
+       if (e < 0x3fff + 32)
+               /* |x| < 0x1p32 */
                return logl(2*x - 1/(x+sqrtl(x*x-1)));
        return logl(x) + 0.693147180559945309417232121458176568L;
 }
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+// TODO: broken implementation to make things compile
+long double acoshl(long double x)
+{
+       return acosh(x);
+}
 #endif