This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).

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 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
     (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 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), 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