msvcrt: Set errno in _logb(f) if x is 0.

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

msvcrt: Set errno in _logb(f) if x is 0.
9e3b3c9b · Alex Henrie · Alexandre Julliard · f9e995de · 9e3b3c9b
Commit 9e3b3c9b authored Jul 27, 2017 by Alex Henrie Committed by Alexandre Julliard Jul 31, 2017
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math.c dlls/msvcrt/math.c +2 -0

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--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -142,6 +142,7 @@ INT CDECL MSVCRT__isnanf( float num )
 float CDECL MSVCRT__logbf( float num )
 {
    if (!finitef(num)) *MSVCRT__errno() = MSVCRT_EDOM;
+    else if (!num) *MSVCRT__errno() = MSVCRT_ERANGE;
    return logbf(num);
 }

@@ -789,6 +790,7 @@ __int64 CDECL _abs64( __int64 n )
 double CDECL MSVCRT__logb(double num)
 {
  if (!isfinite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
+  else if (!num) *MSVCRT__errno() = MSVCRT_ERANGE;
  return logb(num);
 }