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[unix-history] / usr / src / lib / libc / gen / isspace.3

.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     @(#)isspace.3	5.3 (Berkeley) 7/31/91
.\"
.Dd July 31, 1991
.Dt ISSPACE 3
.Os
.Sh NAME
.Nm isspace
.Nd white-space character test
.Sh SYNOPSIS
.Fd #include <ctype.h>
.Ft int
.Fn isspace "int c"
.Sh DESCRIPTION
The
.Fn isspace
function tests for the standard white-space characters
.\" or for any
.\" of an implementation-defined set of characters
for which
.Xr isalnum 3
is false.
The standard white-space characters are the following:
.Pp
.Bl -tag -width xxxxx -offset indent -compact
.It Sq \0
Space character.
.It Li \ef
Form feed.
.It Li \en
New-line.
.It Li \er
Carriage return.
.It Li \et
Horizontal tab.
.It Li \ev
And vertical tab.
.El
.Pp
In the 
.Em ``C''
locale,
.Fn isspace
returns true only for the standard white-space characters.
.Sh RETURN VALUES
The
.Fn isspace
macro returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr isascii 3 ,
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr stdio 3
.Xr ascii 7
.Sh STANDARDS
The
.Fn isspace
function conforms to
.St -ansiC .