The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008
Copyright © 2001-2008 The IEEE and The Open Group

NAME

iswxdigit, iswxdigit_l - test for a hexadecimal digit wide-character code

SYNOPSIS

#include <wctype.h>

int iswxdigit(wint_t
wc);

[CX] [Option Start] int iswxdigit_l(wint_t wc, locale_t locale); [Option End]

DESCRIPTION

For iswxdigit(): [CX] [Option Start]  The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard. [Option End]

The iswxdigit() [CX] [Option Start]  and iswxdigit_l() [Option End]  functions shall test whether wc is a wide-character code representing a character of class xdigit in the current locale of the process, [CX] [Option Start]  or in the locale represented by locale, [Option End]  respectively; see XBD 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 iswxdigit() [CX] [Option Start]  and iswxdigit_l() [Option End]  functions shall return non-zero if wc is a hexadecimal digit wide-character code; otherwise, they shall return 0.

ERRORS

The iswxdigit_l() function may fail if:

[EINVAL]
[CX] [Option Start] locale is not a valid locale object handle. [Option End]

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

To ensure applications portability, especially across natural languages, only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

iswalnum , iswalpha , iswcntrl , iswctype , iswdigit , iswgraph , iswlower , iswprint , iswpunct , iswspace , iswupper , setlocale , uselocale

XBD Locale , <locale.h> , <wctype.h>

CHANGE HISTORY

First released in Issue 4.

Issue 5

The following change has been made in this version for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):

Issue 6

The normative text is updated to avoid use of the term "must" for application requirements.

Issue 7

The iswxdigit_l() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

End of informative text.

 

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