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+.\" Copyright (c) 1991, 1993
+.\" 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.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd December 19, 2022
+.Dt ISSPACE 3
+.Os
+.Sh NAME
+.Nm isspace ,
+.Nm isspace_l
+.Nd white-space character test
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In ctype.h
+.Ft int
+.Fn isspace "int c"
+.Ft int
+.Fn isspace_l "int c" "locale_t loc"
+.Sh DESCRIPTION
+The
+.Fn isspace
+and
+.Fn isspace_l
+functions test for white-space characters.
+For any locale, this includes the following standard characters:
+.Bl -column \&`\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___
+.It "\&``\et''" Ta "``\en''" Ta "``\ev''" Ta "``\ef''" Ta "``\er''" Ta "`` ''"
+.El
+.Pp
+In the "C" locale,
+.Fn isspace
+and
+.Fn isspace_l
+return non-zero for these characters only.
+The value of the argument must be representable as an
+.Vt "unsigned char"
+or the value of
+.Dv EOF .
+.Pp
+The
+.Fn isspace_l
+function takes an explicit locale argument, whereas the
+.Fn isspace
+function uses the current global or per-thread locale.
+.Sh RETURN VALUES
+The
+.Fn isspace
+and
+.Fn isspace_l
+functions return zero if the character tests false and
+return non-zero if the character tests true.
+.Sh COMPATIBILITY
+The
+.Bx 4.4
+extension of accepting arguments outside of the range of the
+.Vt "unsigned char"
+type in locales with large character sets is considered obsolete
+and may not be supported in future releases.
+The
+.Fn iswspace
+or
+.Fn iswspace_l
+function should be used instead.
+.Sh SEE ALSO
+.Xr ctype 3 ,
+.Xr ctype_l 3 ,
+.Xr iswspace 3 ,
+.Xr iswspace_l 3 ,
+.Xr multibyte 3 ,
+.Xr xlocale 3 ,
+.Xr ascii 7
+.Sh STANDARDS
+The
+.Fn isspace
+function conforms to
+.St -isoC .
+The
+.Fn isspace_l
+function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn isspace
+function first appeared in
+.At v7 .