wctype.h, wctype - wide-character classification and mapping utilities
#include <wctype.h>
The <wctype.h> header defines the following types:
As described in <wchar.h>.
A scalar type that can hold values that represent locale-specific character mappings.
As described in <wchar.h>.
The <wctype.h> header defines the following macro name:
Constant expression of type wint_t that is returned by several MSE functions to indicate end-of-file.
For all functions described in this header that accept an argument of type wint_t, the value is representable as a wchar _t or equals the value of WEOF. If this argument has any other value, the behavior is undefined.
The behavior of these functions is affected by the LC_CTYPE category of the current locale.
Inclusion of the <wctype.h> header can make visible all symbols from the headers <ctype.h>, <stdarg.h>, <stddef.h>, <stdio.h>, <stdlib.h>, < string.h>, <time.h>, and <wchar.h>.
See attributes(7) for descriptions of the following attributes:
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setlocale(3C), iswalpha(3C), iswctype(3C), towctrans(3C), towlower(3C), towupper(3C), wctrans(3C), wctype(3C), stdarg(3EXT), locale.h(3HEAD), stddef.h(3HEAD), stdio.h(3HEAD), stdlib.h(3HEAD), string.h(3HEAD), time.h(3HEAD), attributes(7), standards(7)