wctype.h (0p) - Linux Manuals

wctype.h: wide-character classification and mapping utilities


wctype.h - wide-character classification and mapping utilities


#include <wctype.h>


Some of the functionality described on this reference page extends the ISO C standard. Applications shall define the appropriate feature test macro (see the System Interfaces volume of IEEE Std 1003.1-2001, Section 2.2, The Compilation Environment) to enable the visibility of these symbols in this header.

The <wctype.h> header shall define the following types:

As described in <wchar.h> .
A scalar type that can hold values which represent locale-specific character mappings.
As described in <wchar.h> .

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

int       iswalnum(wint_t);
int       iswalpha(wint_t);
int       iswblank(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> header shall define 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 shall be 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>, <stdarg.h>, <stddef.h>, <stdio.h>, <stdlib.h>, <string.h>, <time.h>, and <wchar.h>.

The following sections are informative.








Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


<ctype.h>, <locale.h>, <stdarg.h>, <stddef.h>, <stdio.h>, <stdlib.h>, <string.h>, <time.h>, <wchar.h>, the System Interfaces volume of IEEE Std 1003.1-2001, iswalnum(), iswalpha(), iswblank(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlocale(), towctrans(), towlower(), towupper(), wctrans(), wctype()