ISWALNUM
Section: POSIX Programmer's Manual (3P)
Updated: 2003
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PROLOG
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.
NAME
iswalnum - test for an alphanumeric wide-character code
SYNOPSIS
#include <wctype.h>
int iswalnum(wint_t wc);
DESCRIPTION
The iswalnum() function shall test whether wc is a wide-character
code representing a character of class
alpha or digit in the program's current locale; see the
Base Definitions volume of IEEE Std 1003.1-2001, 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.
RETURN VALUE
The iswalnum() function shall return non-zero if wc is
an alphanumeric wide-character code; otherwise, it 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 this function and those listed in the SEE ALSO
section should be used for classification of wide-character codes.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalpha(), iswcntrl(), iswctype(), iswdigit(),
iswgraph(), iswlower(), iswprint(), iswpunct(),
iswspace(), iswupper(), iswxdigit(), setlocale(),
the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale, <stdio.h>, <wchar.h>,
<wctype.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .