The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group


iswalnum - test for an alphanumeric wide-character code


#include <wctype.h>

int iswalnum(wint_t wc);


The iswalnum() function tests whether wc is a wide-character code representing a character of class alpha or digit in the program's current locale, see the XBD specification, Locale .

In all cases wc is a wint_t, the value of which must be a wide-character code corresponding to a valid character in the current locale or must equal the value of the macro WEOF. If the argument has any other value, the behaviour is undefined.


The iswalnum() function returns non-zero if wc is an alphanumeric wide-character code; otherwise it returns 0.


No errors are defined.




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.




iswalpha(), iswcntrl(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlocale(), <wctype.h>, <wchar.h>, <stdio.h>, the XBD specification, Locale .

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Copyright © 1997 The Open Group
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