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 (like isalnum(3) ), for details.

Return Values

The functions return zero if the character tests false and return nonzero 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.

Table of Contents

• Name
• Library
• Synopsis
• Description
• Return Values
• See Also
• Standards
• Caveats