'\" t .\" Copyright (c) Bruno Haible .\" .\" SPDX-License-Identifier: GPL-2.0-or-later .\" .\" References consulted: .\" GNU glibc-2 source code and manual .\" Dinkumware C library reference http://www.dinkumware.com/ .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html .\" ISO/IEC 9899:1999 .\" .TH iswspace 3 2024-05-02 "Linux man-pages (unreleased)" .SH NAME iswspace \- test for whitespace wide character .SH LIBRARY Standard C library .RI ( libc ", " \-lc ) .SH SYNOPSIS .nf .B #include .P .BI "int iswspace(wint_t " wc ); .fi .SH DESCRIPTION The .BR iswspace () function is the wide-character equivalent of the .BR isspace (3) function. It tests whether .I wc is a wide character belonging to the wide-character class "space". .P The wide-character class "space" is disjoint from the wide-character class "graph" and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct". .\" Note: UNIX98 (susv2/xbd/locale.html) says that "space" and "graph" may .\" have characters in common, except U+0020. But C99 (ISO/IEC 9899:1999 .\" section 7.25.2.1.10) says that "space" and "graph" are disjoint. .P The wide-character class "space" contains the wide-character class "blank". .P The wide-character class "space" always contains at least the space character and the control characters \[aq]\ef\[aq], \[aq]\en\[aq], \[aq]\er\[aq], \[aq]\et\[aq], and \[aq]\ev\[aq]. .SH RETURN VALUE The .BR iswspace () function returns nonzero if .I wc is a wide character belonging to the wide-character class "space". Otherwise, it returns zero. .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ .na .nh .BR iswspace () T} Thread safety MT-Safe locale .TE .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY POSIX.1-2001, C99. .SH NOTES The behavior of .BR iswspace () depends on the .B LC_CTYPE category of the current locale. .SH SEE ALSO .BR isspace (3), .BR iswctype (3)