[src/trunk]: src/lib/libc/gen Mention more of the special cases.

[mycroft <mycroft%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/26fce10a1f54
branches:  trunk
changeset: 475908:26fce10a1f54
user:      mycroft <mycroft%NetBSD.org@localhost>
date:      Sun Aug 29 18:52:18 1999 +0000

description:
Mention more of the special cases.

diffstat:

 lib/libc/gen/ldexp.3 |  20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diffs (39 lines):

diff -r 29bc205a7b92 -r 26fce10a1f54 lib/libc/gen/ldexp.3
--- a/lib/libc/gen/ldexp.3      Sun Aug 29 18:40:50 1999 +0000
+++ b/lib/libc/gen/ldexp.3      Sun Aug 29 18:52:18 1999 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: ldexp.3,v 1.5 1998/02/05 18:47:27 perry Exp $
+.\"    $NetBSD: ldexp.3,v 1.6 1999/08/29 18:52:18 mycroft Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"    The Regents of the University of California.  All rights reserved.
@@ -62,14 +62,26 @@
 times 2 raised to the power
 .Fa exp .
 .Pp
-If the resultant value would cause an overflow,
+If the input
+.Va x
+is a NaN, infinity, or 0.0, it is returned unchanged.
+.Pp
+If the result would cause an overflow,
 the global variable
 .Va errno
 is set to
 .Er ERANGE
 and the value
-.Dv HUGE
-is returned.
+.Dv HUGE_VAL
+is returned, with the same sign as
+.Fa x .
+.Pp
+If the result would cause underflow to 0.0,
+the global variable
+.Va errno
+is set to
+.Er ERANGE
+and the value 0.0 is returned.
 .Sh SEE ALSO
 .Xr frexp 3 ,
 .Xr modf 3 ,