<wctype.h>(P) POSIX Programmer's Manual <wctype.h>(P)
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NAMEwctype.h - wide-character classification and mapping utilities
SYNOPSIS
#include <wctype.h>
DESCRIPTION
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, Sec‐
tion 2.2, The Compilation Environment) to enable the visibility of
these symbols in this header.
The <wctype.h> header shall define the following types:
wint_t As described in <wchar.h> .
wctrans_t
A scalar type that can hold values which represent locale-spe‐
cific character mappings.
wctype_t
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:
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 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 cate‐
gory 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.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<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(), towc‐
trans(), towlower(), towupper(), wctrans(), wctype()COPYRIGHT
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 .
IEEE/The Open Group 2003 <wctype.h>(P)
