ISWALNUM(3) |
Library Functions Manual |
ISWALNUM(3) |
NAME
iswalnum, iswalpha, iswblank, iswcntrl, iswdigit, iswgraph, iswlower, iswprint, iswpunct, iswspace, 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
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.