fix uninitialized variable in new __res_msend dns function

[musl] / src / math / truncl.c

diff --git a/src/math/truncl.c b/src/math/truncl.c
index d817e9a..3eedb08 100644 (file)
--- a/src/math/truncl.c
+++ b/src/math/truncl.c
@@ -1,23 +1,3 @@
-/* origin: FreeBSD /usr/src/lib/msun/src/s_truncl.c */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
-/*
- * truncl(x)
- * Return x rounded toward 0 to integral value
- * Method:
- *      Bit twiddling.
- * Exception:
- *      Inexact flag raised if x not equal to truncl(x).
- */
-
 #include "libm.h"
 
 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
@@ -26,43 +6,31 @@ long double truncl(long double x)
        return trunc(x);
 }
 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
-#ifdef LDBL_IMPLICIT_NBIT
-#define MANH_SIZE       (LDBL_MANH_SIZE + 1)
-#else
-#define MANH_SIZE       LDBL_MANH_SIZE
+#if LDBL_MANT_DIG == 64
+#define TOINT 0x1p63
+#elif LDBL_MANT_DIG == 113
+#define TOINT 0x1p112
 #endif
-
-static const long double huge = 1.0e300;
-static const float zero[] = { 0.0, -0.0 };
-
 long double truncl(long double x)
 {
-       union IEEEl2bits u = { .e = x };
-       int e = u.bits.exp - LDBL_MAX_EXP + 1;
+       union ldshape u = {x};
+       int e = u.i.se & 0x7fff;
+       int s = u.i.se >> 15;
+       long double y;
 
-       if (e < MANH_SIZE - 1) {
-               if (e < 0) {
-                       /* raise inexact if x != 0 */
-                       if (huge + x > 0.0)
-                               u.e = zero[u.bits.sign];
-               } else {
-                       uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
-                       if (((u.bits.manh & m) | u.bits.manl) == 0)
-                               return x;     /* x is integral */
-                       /* raise inexact */
-                       if (huge + x > 0.0) {
-                               u.bits.manh &= ~m;
-                               u.bits.manl = 0;
-                       }
-               }
-       } else if (e < LDBL_MANT_DIG - 1) {
-               uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
-               if ((u.bits.manl & m) == 0)
-                       return x;     /* x is integral */
-               /* raise inexact */
-               if (huge + x > 0.0)
-                       u.bits.manl &= ~m;
+       if (e >= 0x3fff+LDBL_MANT_DIG-1)
+               return x;
+       if (e <= 0x3fff-1) {
+               FORCE_EVAL(x + 0x1p120f);
+               return x*0;
        }
-       return u.e;
+       /* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
+       if (s)
+               x = -x;
+       y = x + TOINT - TOINT - x;
+       if (y > 0)
+               y -= 1;
+       x += y;
+       return s ? -x : x;
 }
 #endif