[PATCH 2/4] msvcrt: Set errno in _logb(f) if x is 0.

[Alex Henrie]

This behavior appears to be consistent across all versions of MSVC.

Signed-off-by: Alex Henrie <alexhenrie24 at gmail.com>
---
 dlls/msvcrt/math.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 1d61396e59..2433376427 100644
--- 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);
 }
 
-- 
2.13.3