ISWALNUM(3) BSD Library Functions Manual ISWALNUM(3)NAME
iswalnum, iswalpha, iswascii, iswblank, iswcntrl, iswdigit, iswgraph,
iswhexnumber, iswideogram, iswlower, iswnumber, iswphonogram, iswprint,
iswpunct, iswrune, iswspace, iswspecial, iswupper, iswxdigit — wide char‐
acter 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 ALSOisalnum(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
