msvcrt: Don't report an underflow for ldexp(0, x) or _scalb(0, x).

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com> Signed-off-by: piotr@codeweavers.com Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvcrt: Don't report an underflow for ldexp(0, x) or _scalb(0, x).
b6774e38 · Alex Henrie · Alexandre Julliard · 96ba1bc4 · b6774e38 · b6774e38
Commit b6774e38 authored Sep 10, 2018 by Alex Henrie Committed by Alexandre Julliard Sep 11, 2018
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math.c dlls/msvcrt/math.c +1 -1

misc.c dlls/ucrtbase/tests/misc.c +2 -0

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--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -1015,7 +1015,7 @@ double CDECL MSVCRT_ldexp(double num, MSVCRT_long exp)

  if (isfinite(num) && !isfinite(z))
    math_error(_OVERFLOW, "ldexp", num, exp, z);
-  else if (isfinite(num) && !z)
+  else if (num && isfinite(num) && !z)
    math_error(_UNDERFLOW, "ldexp", num, exp, z);
  else if (z == 0 && signbit(z))
    z = 0.0; /* Convert -0 -> +0 */

--- a/dlls/ucrtbase/tests/misc.c
+++ b/dlls/ucrtbase/tests/misc.c
@@ -694,11 +694,13 @@ static void test_math_errors(void)
    } testsdl[] = {
        {"_scalb", -INFINITY, 1, -1, -1},
        {"_scalb", -1e100, 1, -1, -1},
+        {"_scalb", 0, 1, -1, -1},
        {"_scalb", 1e100, 1, -1, -1},
        {"_scalb", INFINITY, 1, -1, -1},
        {"_scalb", 1, 1e9, ERANGE, _OVERFLOW},
        {"ldexp", -INFINITY, 1, -1, -1},
        {"ldexp", -1e100, 1, -1, -1},
+        {"ldexp", 0, 1, -1, -1},
        {"ldexp", 1e100, 1, -1, -1},
        {"ldexp", INFINITY, 1, -1, -1},
        {"ldexp", 1, -1e9, -1, _UNDERFLOW},