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 (such as
isalnum(3)), for details.
Extended locale versions of these functions are documented in
iswalnum_l(3). See xlocale(3) for more information.
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), iswalnum_l(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
