NAME
iswalnum,
iswalpha, iswblank,
iswcntrl, iswdigit,
iswgraph, iswlower,
iswprint, iswpunct,
iswspace, iswupper,
iswxdigit —
wide-character classification
utilities
SYNOPSIS
#include
<wctype.h>
int
iswalnum(wint_t
wc);
int
iswalpha(wint_t
wc);
int
iswblank(wint_t
wc);
int
iswcntrl(wint_t
wc);
int
iswdigit(wint_t
wc);
int
iswgraph(wint_t
wc);
int
iswlower(wint_t
wc);
int
iswprint(wint_t
wc);
int
iswpunct(wint_t
wc);
int
iswspace(wint_t
wc);
int
iswupper(wint_t
wc);
int
iswxdigit(wint_t
wc);
DESCRIPTION
The functions are character classification utility functions, for use with wide characters (wchar_t or wint_t). See the description of singlebyte 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), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3)
STANDARDS
The functions conform to ISO/IEC 9899:1999 (“ISO C99”).
CAVEATS
The argument to these functions must be
WEOF or a valid wchar_t value
with the current locale; otherwise, the result is undefined.
BUGS
In a UTF-8 locale these functions return wrong answers for some characters because they do not cover the entire Unicode character set.