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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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ISWBLANK(3P) POSIX Programmer's Manual ISWBLANK(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
iswblank, iswblank_l — test for a blank wide-character code
#include <wctype.h>
int iswblank(wint_t wc);
int iswblank_l(wint_t wc, locale_t locale);
For iswblank(): The functionality described on this reference page
is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is
unintentional. This volume of POSIX.1‐2017 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
current locale, or in the locale represented by locale,
respectively; see the Base Definitions volume of POSIX.1‐2017,
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 locale used by the function, 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.
The iswblank() and iswblank_l() functions shall return non-zero if
wc is a blank wide-character code; otherwise, they shall return 0.
No errors are defined.
The following sections are informative.
None.
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.
None.
None.
iswalnum(3p), iswalpha(3p), iswcntrl(3p), iswctype(3p),
iswdigit(3p), iswgraph(3p), iswlower(3p), iswprint(3p),
iswpunct(3p), iswspace(3p), iswupper(3p), iswxdigit(3p),
setlocale(3p), uselocale(3p)
The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
locale.h(0p), wctype.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. 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 Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/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 2017 ISWBLANK(3P)
Pages that refer to this page: wctype.h(0p), setlocale(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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