wctype.h File
Purpose
Contains wide-character classification and mapping utilities.
Syntax
#include <wctype.h>
Description
The wctype.h header defines the following data types through typedef:
| Item | Description |
|---|---|
| wint_t | As described in wchar.h. |
| wctrans_t | A scalar type that can hold values that represent locale-specific character mappings. |
| wctype_t | As described in wchar.h. |
The wctype.h header declares the following as functions and may also define them as macros. Function prototypes must be provided for use with an ISO C compiler.
int iswalnum(wint_t);
int iswalpha(wint_t);
int iswcntrl(wint_t);
int iswdigit(wint_t);
int iswgraph(wint_t);
int iswlower(wint_t);
int iswprint(wint_t);
int iswpunct(wint_t);
int iswspace(wint_t);
int iswupper(wint_t);
int iswxdigit(wint_t);
int iswctype(wint_t, wctype_t);
wint_t towctrans(wint_t, wctrans_t);
wint_t towlower(wint_t);
wint_t towupper(wint_t);
wctrans_t wctrans(const char *);
wctype_t wctype(const char *);The wctype.h defines the following macro name:
| Item | Description |
|---|---|
| WEOF | 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 will be representable as a wchar_t or will equal the value of WEOF. If this argument has any other value, the behaviour is undefined.
The behaviour of these functions is affected by the LC_CTYPE category of the current locale.
Inclusion of the wctype.h header may make visible all symbols from the headers ctype.h, stdio.h, stdarg.h, stdlib.h, string.h, stddef.h time.h and wchar.h.