[PATCH] msvcrt: Don't report an underflow for ldexp(0, x) or _scalb(0, x)
Alex Henrie
alexhenrie24 at gmail.com
Mon Sep 10 23:42:03 CDT 2018
Signed-off-by: Alex Henrie <alexhenrie24 at gmail.com>
---
dlls/msvcrt/math.c | 2 +-
dlls/ucrtbase/tests/misc.c | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 8d5b687b6f..a1ba552632 100644
--- 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 */
diff --git a/dlls/ucrtbase/tests/misc.c b/dlls/ucrtbase/tests/misc.c
index 2a9648ab6e..bd8034e994 100644
--- 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},
--
2.18.0
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