From: eck <none@none>
Date: Thu, 29 Mar 1990 09:05:21 +0000 (+0000)
Subject: several bug fixes after test-suite
X-Git-Tag: release-5-5~1765
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=34d54a20b140db929130501092d517d257e11b46;p=ack.git

several bug fixes after test-suite
---

diff --git a/lang/cem/libcc.ansi/math/exp.c b/lang/cem/libcc.ansi/math/exp.c
index c5db4be0a..11a3ab693 100644
--- a/lang/cem/libcc.ansi/math/exp.c
+++ b/lang/cem/libcc.ansi/math/exp.c
@@ -38,11 +38,11 @@ exp(double x)
 
 	if (x <= M_LN_MIN_D) {
 		if (x < M_LN_MIN_D) errno = ERANGE;
-		return DBL_MIN;
+		return 0.0;
 	}
 	if (x >= M_LN_MAX_D) {
 		if (x > M_LN_MAX_D) errno = ERANGE;
-		return DBL_MAX;
+		return HUGE_VAL;
 	}
 
 	if (negative) x = -x;
diff --git a/lang/cem/libcc.ansi/math/ldexp.c b/lang/cem/libcc.ansi/math/ldexp.c
index 4a48f1d5b..5ec83a8fd 100644
--- a/lang/cem/libcc.ansi/math/ldexp.c
+++ b/lang/cem/libcc.ansi/math/ldexp.c
@@ -5,6 +5,8 @@
 /* $Header$ */
 
 #include	<math.h>
+#include	<float.h>
+#include	<errno.h>
 
 double
 ldexp(double fl, int exp)
@@ -12,6 +14,7 @@ ldexp(double fl, int exp)
 	int sign = 1;
 	int currexp;
 
+	if (fl == 0.0) return 0.0;
 	if (fl<0) {
 		fl = -fl;
 		sign = -1;
@@ -19,6 +22,10 @@ ldexp(double fl, int exp)
 	fl = frexp(fl,&currexp);
 	exp += currexp;
 	if (exp > 0) {
+		if (exp > DBL_MAX_EXP) {
+			errno = ERANGE;
+			return sign * HUGE_VAL;
+		}
 		while (exp>30) {
 			fl *= (double) (1L << 30);
 			exp -= 30;
@@ -26,6 +33,10 @@ ldexp(double fl, int exp)
 		fl *= (double) (1L << exp);
 	}
 	else	{
+		/* number need not be normalized */
+		if (exp < DBL_MIN_EXP - DBL_MANT_DIG) {
+			return 0.0;
+		}
 		while (exp<-30) {
 			fl /= (double) (1L << 30);
 			exp += 30;