ISWALNUM(3P) POSIX Programmer's Manual ISWALNUM(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.
iswalnum - test for an alphanumeric wide-character code
int iswalnum(wint_t wc);
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 Defini-
tions 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.
The iswalnum() function shall return non-zero if wc is an alphanumeric wide-character
code; otherwise, it shall return 0.
No errors are defined.
The following sections are informative.
To ensure applications portability, especially across natural languages, only this func-
tion and those listed in the SEE ALSO section should be used for classification of wide-
iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(), iswprint(), isw-
punct(), iswspace(), iswupper(), iswxdigit(), setlocale(), the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale, <stdio.h>, <wchar.h>, <wctype.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ISWALNUM(3P)