ISWALNUM(3)

NAME
iswalnum, iswalnum_l, iswalpha, iswalpha_l, iswblank, iswblank_l, iswcntrl, iswcntrl_l, iswdigit, iswdigit_l, iswgraph, iswgraph_l, iswlower, iswlower_l, iswprint, iswprint_l, iswpunct, iswpunct_l, iswspace, iswspace_l, iswupper, iswupper_l, iswxdigit, iswxdigit_l - wide-character classification utilities

SYNOPSIS
#include <wctype.h>
int
iswalnum(wint_t wc);
int
iswalnum_l(wint_t wc, locale_t locale);
int
iswalpha(wint_t wc);
int
iswalpha_l(wint_t wc, locale_t locale);
int
iswblank(wint_t wc);
int
iswblank_l(wint_t wc, locale_t locale);
int
iswcntrl(wint_t wc);
int
iswcntrl_l(wint_t wc, locale_t locale);
int
iswdigit(wint_t wc);
int
iswdigit_l(wint_t wc, locale_t locale);
int
iswgraph(wint_t wc);
int
iswgraph_l(wint_t wc, locale_t locale);
int
iswlower(wint_t wc);
int
iswlower_l(wint_t wc, locale_t locale);
int
iswprint(wint_t wc);
int
iswprint_l(wint_t wc, locale_t locale);
int
iswpunct(wint_t wc);
int
iswpunct_l(wint_t wc, locale_t locale);
int
iswspace(wint_t wc);
int
iswspace_l(wint_t wc, locale_t locale);
int
iswupper(wint_t wc);
int
iswupper_l(wint_t wc, locale_t locale);
int
iswxdigit(wint_t wc);
int
iswxdigit_l(wint_t wc, locale_t locale);

DESCRIPTION
The functions are character classification utility functions, for use with wide characters ( wchar_t or wint_t). See the description of singlebyte classification functions, like isalnum(3), for details.

The two-argument variants use the specified locale, while the others use the thread-specific locale set with uselocale(3), falling back to the global locale set with setlocale(3).

RETURN VALUES
The functions return zero if the character tests false and return non-zero if the character tests true.

SEE ALSO
isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), iswctype(3), isxdigit(3), newlocale(3), setlocale(3), towlower(3)

STANDARDS
The one-argument functions conform to isoC-99, the two-argument functions to p1003.1-2008.

CAVEATS
The argument wc must be WEOF or a valid wchar_t value with the current locale; otherwise, the result is undefined.