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(freebsd section 3)
man page for iswnumber

ISWALNUM(3)						   BSD Library Functions Manual 					       ISWALNUM(3)

iswalnum, iswalpha, iswascii, iswblank, iswcntrl, iswdigit, iswgraph, iswhexnumber, iswideogram, iswlower, iswnumber, iswphonogram, iswprint, iswpunct, iswrune, iswspace, iswspecial, iswupper, iswxdigit -- wide character classification utilities LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wctype.h> int iswalnum(wint_t wc); int iswalpha(wint_t wc); int iswascii(wint_t wc); int iswblank(wint_t wc); int iswcntrl(wint_t wc); int iswdigit(wint_t wc); int iswgraph(wint_t wc); int iswhexnumber(wint_t wc); int iswideogram(wint_t wc); int iswlower(wint_t wc); int iswnumber(wint_t wc); int iswphonogram(wint_t wc); int iswprint(wint_t wc); int iswpunct(wint_t wc); int iswrune(wint_t wc); int iswspace(wint_t wc); int iswspecial(wint_t wc); int iswupper(wint_t wc); int iswxdigit(wint_t wc); DESCRIPTION
The above functions are character classification utility functions, for use with wide characters (wchar_t or wint_t). See the description for the similarly-named single byte classification functions (like isalnum(3)), for details. 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), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), ishexnumber(3), isideogram(3), islower(3), isnumber(3), isphonogram(3), isprint(3), ispunct(3), isrune(3), isspace(3), isspecial(3), isupper(3), isxdigit(3), wctype(3) STANDARDS
These functions conform to IEEE Std 1003.1-2001 (``POSIX.1''), except iswascii(), iswhexnumber(), iswideogram(), iswnumber(), iswphonogram(), iswrune() and iswspecial(), which are FreeBSD extensions. CAVEATS
The result of these functions is undefined unless the argument is WEOF or a valid wchar_t value for the current locale. BSD
October 3, 2002 BSD

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