| .\" Copyright (c) Bruno Haible <haible@clisp.cons.org> |
| .\" |
| .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA) |
| .\" This is free documentation; you can redistribute it and/or |
| .\" modify it under the terms of the GNU General Public License as |
| .\" published by the Free Software Foundation; either version 2 of |
| .\" the License, or (at your option) any later version. |
| .\" %%%LICENSE_END |
| .\" |
| .\" 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 ISWBLANK 3 2019-03-06 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| iswblank \- test for whitespace wide character |
| .SH SYNOPSIS |
| .nf |
| .B #include <wctype.h> |
| .PP |
| .BI "int iswblank(wint_t " wc ); |
| .fi |
| .PP |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .PP |
| .ad l |
| .BR iswblank (): |
| .RS |
| _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L |
| .RE |
| .ad |
| .SH DESCRIPTION |
| The |
| .BR iswblank () |
| function is the wide-character equivalent of the |
| .BR isblank (3) |
| function. |
| It tests whether \fIwc\fP is a wide character |
| belonging to the wide-character class "blank". |
| .PP |
| The wide-character class "blank" is a subclass of the wide-character class |
| "space". |
| .PP |
| Being a subclass of the wide-character class "space", |
| the wide-character class "blank" is disjoint from the |
| wide-character class "graph" and therefore also disjoint |
| from its subclasses "alnum", "alpha", "upper", "lower", "digit", |
| "xdigit", "punct". |
| .PP |
| The wide-character class "blank" always contains |
| at least the space character |
| and the control character \(aq\et\(aq. |
| .SH RETURN VALUE |
| The |
| .BR iswblank () |
| function returns nonzero |
| if \fIwc\fP is a wide character |
| belonging to the wide-character class "blank". |
| Otherwise, it returns zero. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR iswblank () |
| T} Thread safety MT-Safe locale |
| .TE |
| .SH CONFORMING TO |
| POSIX.1-2001, POSIX.1-2008. |
| .SH NOTES |
| The behavior of |
| .BR iswblank () |
| depends on the |
| .B LC_CTYPE |
| category of the |
| current locale. |
| .SH SEE ALSO |
| .BR isblank (3), |
| .BR iswctype (3) |
