Reduce confusion in scalbnl() family of functions.

The changes unrelated to the bug in r277948 made
the code very difficult to understand to both
coverity and regular humans so take a step back
to something that is much easier to understand
for both and follows better the original code.

CID:	1267992, 1267993, 1267994
Discussed with:	kargl

1 files changed, 10 insertions, 3 deletions

diff --git a/lib/msun/src/s_scalbln.c b/lib/msun/src/s_scalbln.c
index 2aa6900..7d134a6 100644
--- a/lib/msun/src/s_scalbln.c
+++ b/lib/msun/src/s_scalbln.c
@@ -35,7 +35,9 @@ scalbln (double x, long n)
 {
 	int in;
 
-	in = (n > INT_MAX) ? INT_MAX : (n < INT_MIN) ? INT_MIN : n;
+	in = (int)n;
+	if (in != n)
+		in = (n > 0) ? INT_MAX: INT_MIN;
 	return (scalbn(x, in));
 }
 
@@ -44,7 +46,9 @@ scalblnf (float x, long n)
 {
 	int in;
 
-	in = (n > INT_MAX) ? INT_MAX : (n < INT_MIN) ? INT_MIN : n;
+	in = (int)n;
+	if (in != n)
+		in = (n > 0) ? INT_MAX: INT_MIN;
 	return (scalbnf(x, in));
 }
 
@@ -53,6 +57,9 @@ scalblnl (long double x, long n)
 {
 	int in;
 
-	in = (n > INT_MAX) ? INT_MAX : (n < INT_MIN) ? INT_MIN : n; 
+	in = (int)n;
+	if (in != n) {
+		in = (n > 0) ? INT_MAX: INT_MIN;
+	}
 	return (scalbnl(x, in));
 }