ISWBLANK(3P) POSIX Programmer's Manual ISWBLANK(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
iswblank, iswblank_l -- test for a blank wide-character code
SYNOPSIS
#include <wctype.h>
int iswblank(wint_t wc);
int iswblank_l(wint_t wc, locale_t locale);
DESCRIPTION
For iswblank(): The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the require-
ments described here and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.
The iswblank() and iswblank() functions shall test whether wc is a wide-character code representing a character of class blank in the cur-
rent locale, or in the locale represented by locale, respectively; see the Base Definitions volume of POSIX.1-2008, Chapter 7, Locale.
The wc argument is a wint_t, the value of which the application shall ensure is a wide-character code corresponding to a valid character in
the current locale, or equal to the value of the macro WEOF. If the argument has any other value, the behavior is undefined.
The behavior is undefined if the locale argument to iswblank_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
object handle.
RETURN VALUE
The iswblank() and iswblank_l() functions shall return non-zero if wc is a blank wide-character code; otherwise, they shall return 0.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
To ensure applications portability, especially across natural languages, only these functions and the functions in the reference pages
listed in the SEE ALSO section should be used for character classification.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalnum(), iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(),
iswxdigit(), setlocale(), uselocale()
The Base Definitions volume of POSIX.1-2008, Chapter 7, Locale, <locale.h>, <wctype.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE
/The Open Group 2013 ISWBLANK(3P)