Character Manipulation Function

int isxdigit(int c);

int iswxdigit(wint_t c);

int _istxdigit(_TINT c);

Internationalization (I18n) Function Overview

The function isxdigit tests for any hexadecimal character ('0' through '9', 'a' through 'f', and 'A' through 'F'), using the LC_CTYPE category setting of the current locale.

iswxdigit is the wide character equivalent of isxdigit, testing the wide character c.

_istxdigit is the Windows-only Generic version of the function; with the _MBCS or _UNICODE compiler flags determining its mapping to either isxdigit or iswxdigit.

I18n Issues

Use the appropriate version of the function as required for internationalization support, noting the following:

There is no multibyte version of isxdigit. However, since the test is for a character in the ASCII range, this function will work for multibyte characters, as long as the test is made on the initial byte of the multibyte character.

Prior to calling isxdigit on both ANSI and Windows platforms, and iswxdigit on ANSI platforms, ensure that the locale is set correctly, since the result of the test condition depends on the locale's LC_CTYPE category setting. On Windows platforms, the iswxdigit test is independent of locale.

Recommended Replacements*

ANSI UTF-8	isxdigit
ANSI UTF-16	iswxdigit
Microsoft Windows MBCS	isxdigit
Microsoft Windows Unicode	iswxdigit
Microsoft Windows Generic	_istxdigit

Character Manipulation Functions