NAME
iswalnum
iswalnum_l — test for an
alphanumeric wide-character code
SYNOPSIS
#include
<wctype.h>
int iswalnum(wint_t wc); [CX] int iswalnum_l(wint_t wc, locale_t locale);
DESCRIPTION
For iswalnum (): [CX]
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.
The iswalnum ()
[CX] and iswalnum_l () functions shall
test whether wc is a wide-character code representing a
character of class
alpha or
digit in
the current locale of the process, [CX] or in the locale
represented by
locale,
respectively; see XBD V1_chap07(7) .
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 iswalnum () [CX] and
iswalnum_l () functions shall return non-zero if
wc is an alphanumeric wide-character code; otherwise, they
shall return 0.
ERRORS
The iswalnum_l () function may fail if:
- [EINVAL]
- [CX] locale is not a valid locale object handle.
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
iswalpha(3) , iswcntrl(3) , iswctype(3) , iswdigit(3) , iswgraph(3) , iswlower(3) , iswprint(3) , iswpunct(3) , iswspace(3) , iswupper(3) , iswxdigit(3) , setlocale(3) , uselocale(3)
XBD V1_chap07(7) , <locale.h> , <stdio.h> , <wctype.h>
CHANGE HISTORY
First released as a World-wide Portability Interface in Issue 4.
Issue 5
The following change has been made in this version for alignment with ISO/IEC 9899/AMD1:1995 (“ISO C90, Amendment 1”) (E):
- The SYNOPSIS has been changed to indicate that this function and associated data types are now made visible by inclusion of the <wctype.h> header rather than <wchar.h>.
Issue 6
The normative text is updated to avoid use of the term "must" for application requirements.
Issue 7
The iswalnum_l () function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.