iswalnum - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEiswalnum − test for alphanumeric wide character

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <wctype.h>int iswalnum(wint_t wc);

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DESCRIPTIONThe iswalnum() function is the wide-character equivalent of the isalnum(3) function. It tests whether wc is a wide character belonging to the wide-character class "alnum". The wide-character class "alnum" is a subclass of the wide-character class "graph", and therefore also a subclass of the wide-character class "print". Being a subclass of the wide-character class "print", the wide-character class "alnum" is disjoint from the wide-character class "cntrl". Being a subclass of the wide-character class "graph", the wide-character class "alnum" is disjoint from the wide-character class "space" and its subclass "blank". The wide-character class "alnum" is disjoint from the wide-character class "punct". The wide-character class "alnum" is the union of the wide-character classes "alpha" and "digit". As such, it also contains the wide-character class "xdigit". The wide-character class "alnum" always contains at least the letters 'A' to 'Z', 'a' to 'z' and the digits '0' to '9'.

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RETURN VALUEThe iswalnum() function returns nonzero if wc is a wide character belonging to the wide-character class "alnum". Otherwise, it returns zero.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue iswalnum() Thread safetyMT-Safe locale

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STANDARDSPOSIX.1-2001, POSIX.1-2008, C99.

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NOTESThe behavior of iswalnum() depends on the LC_CTYPE category of the current locale.

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SEE ALSOisalnum(3), iswctype(3) 0

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