Wed Sep 27 09:04:30 2017 UTC ()
Move VAX notes to CAVEATS, clarify that it just returns zero

The VAX isinf implementation is in sys/arch/vax/include/math.h.


(maya)
diff -r1.12 -r1.13 src/lib/libc/gen/isinf.3
cvs diff -r1.12 -r1.13 src/lib/libc/gen/isinf.3 (expand / switch to unified diff)

--- src/lib/libc/gen/isinf.3 2004/03/04 23:47:56 1.12
+++ src/lib/libc/gen/isinf.3 2017/09/27 09:04:30 1.13
@@ -1,14 +1,14 @@ @@ -1,14 +1,14 @@
1.\" $NetBSD: isinf.3,v 1.12 2004/03/04 23:47:56 wiz Exp $ 1.\" $NetBSD: isinf.3,v 1.13 2017/09/27 09:04:30 maya Exp $
2.\" 2.\"
3.\" Copyright (c) 1991, 1993 3.\" Copyright (c) 1991, 1993
4.\" The Regents of the University of California. All rights reserved. 4.\" The Regents of the University of California. All rights reserved.
5.\" 5.\"
6.\" Redistribution and use in source and binary forms, with or without 6.\" Redistribution and use in source and binary forms, with or without
7.\" modification, are permitted provided that the following conditions 7.\" modification, are permitted provided that the following conditions
8.\" are met: 8.\" are met:
9.\" 1. Redistributions of source code must retain the above copyright 9.\" 1. Redistributions of source code must retain the above copyright
10.\" notice, this list of conditions and the following disclaimer. 10.\" notice, this list of conditions and the following disclaimer.
11.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" 2. Redistributions in binary form must reproduce the above copyright
12.\" notice, this list of conditions and the following disclaimer in the 12.\" notice, this list of conditions and the following disclaimer in the
13.\" documentation and/or other materials provided with the distribution. 13.\" documentation and/or other materials provided with the distribution.
14.\" 3. Neither the name of the University nor the names of its contributors 14.\" 3. Neither the name of the University nor the names of its contributors
@@ -19,66 +19,65 @@ @@ -19,66 +19,65 @@
19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28.\" SUCH DAMAGE. 28.\" SUCH DAMAGE.
29.\" 29.\"
30.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94 30.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94
31.\" 31.\"
32.Dd March 5, 2004 32.Dd September 27, 2017
33.Dt ISINF 3 33.Dt ISINF 3
34.Os 34.Os
35.Sh NAME 35.Sh NAME
36.Nm isinf 36.Nm isinf
37.Nd test for infinity 37.Nd test for infinity
38.Sh LIBRARY 38.Sh LIBRARY
39.Lb libc 39.Lb libc
40.Sh SYNOPSIS 40.Sh SYNOPSIS
41.In math.h 41.In math.h
42.Ft int 42.Ft int
43.Fn isinf "real-floating x" 43.Fn isinf "real-floating x"
44.Sh DESCRIPTION 44.Sh DESCRIPTION
45The 45The
46.Fn isinf 46.Fn isinf
47macro determines whether its argument 47macro determines whether its argument
48.Fa x 48.Fa x
49is an infinity (positive or negative). 49is an infinity (positive or negative).
50An argument represented in a format wider than its semantic type is 50An argument represented in a format wider than its semantic type is
51converted to its semantic type first. 51converted to its semantic type first.
52The determination is then based on the type of the argument. 52The determination is then based on the type of the argument.
53.Ss IEEE 754 
54It is determined whether the value of 
55.Fa x 
56is an infinity. 
57.Ss VAX 
58Infinities are not supported. 
59.Sh RETURN VALUES 53.Sh RETURN VALUES
60The 54The
61.Fn isinf 55.Fn isinf
62macro returns a non-zero value if the value of 56macro returns a non-zero value if the value of
63.Fa x 57.Fa x
64is an infinity. 58is an infinity.
65Otherwise 0 is returned. 59Otherwise 0 is returned.
66.Sh SEE ALSO 60.Sh SEE ALSO
67.Xr fpclassify 3 , 61.Xr fpclassify 3 ,
68.Xr isfinite 3 , 62.Xr isfinite 3 ,
69.Xr isinff 3 , 63.Xr isinff 3 ,
70.Xr isnan 3 , 64.Xr isnan 3 ,
71.Xr isnanf 3 , 65.Xr isnanf 3 ,
72.Xr isnormal 3 , 66.Xr isnormal 3 ,
73.Xr math 3 , 67.Xr math 3 ,
74.Xr signbit 3 68.Xr signbit 3
75.Rs 69.Rs
76.%T "IEEE Standard for Binary Floating-Point Arithmetic" 70.%T "IEEE Standard for Binary Floating-Point Arithmetic"
77.%Q ANSI 71.%Q ANSI
78.%R Std 754-1985 72.%R Std 754-1985
79.Re 73.Re
80.Sh STANDARDS 74.Sh STANDARDS
81The 75The
82.Fn isinf 76.Fn isinf
83macro conforms to 77macro conforms to
84.St -isoC-99 . 78.St -isoC-99 .
 79.Sh CAVEATS
 80On VAX the
 81.Fn isinf
 82function always returns 0,
 83as the architecture doesn't have a representation for infinity.