wchar.h
<wchar.h>(P) <wchar.h>(P)
NAME
wchar.h - wide-character handling
SYNOPSIS
#include <wchar.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 <wchar.h> header shall define the following types:
wchar_t
As described in <stddef.h> .
wint_t An integer type capable of storing any valid value of wchar_t
or WEOF.
wctype_t
A scalar type of a data object that can hold values which rep-
resent locale-specific character classification.
mbstate_t
An object type other than an array type that can hold the con-
version state information necessary to convert between
sequences of (possibly multi-byte) characters and wide charac-
ters. If a codeset is being used such that an mbstate_t
needs to preserve more than 2 levels of reserved state, the
results are unspecified.
FILE As described in <stdio.h> .
size_t As described in <stddef.h> .
va_list
As described in <stdarg.h> .
The implementation shall support one or more programming environments
in which the width of wint_t is no greater than the width of type
long. The names of these programming environments can be obtained
using the confstr() function or the getconf utility.
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
wint_t btowc(int);
wint_t fgetwc(FILE *);
wchar_t *fgetws(wchar_t *restrict, int, FILE *restrict);
wint_t fputwc(wchar_t, FILE *);
int fputws(const wchar_t *restrict, FILE *restrict);
int fwide(FILE *, int);
int fwprintf(FILE *restrict, const wchar_t *restrict, ...);
int fwscanf(FILE *restrict, const wchar_t *restrict, ...);
wint_t getwc(FILE *);
wint_t getwchar(void);
int iswalnum(wint_t);
int iswalpha(wint_t);
int iswcntrl(wint_t);
int iswctype(wint_t, wctype_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);
size_t mbrlen(const char *restrict, size_t, mbstate_t *restrict);
size_t mbrtowc(wchar_t *restrict, const char *restrict, size_t,
mbstate_t *restrict);
int mbsinit(const mbstate_t *);
size_t mbsrtowcs(wchar_t *restrict, const char **restrict, size_t,
mbstate_t *restrict);
wint_t putwc(wchar_t, FILE *);
wint_t putwchar(wchar_t);
int swprintf(wchar_t *restrict, size_t,
const wchar_t *restrict, ...);
int swscanf(const wchar_t *restrict,
const wchar_t *restrict, ...);
wint_t towlower(wint_t);
wint_t towupper(wint_t);
wint_t ungetwc(wint_t, FILE *);
int vfwprintf(FILE *restrict, const wchar_t *restrict, va_list);
int vfwscanf(FILE *restrict, const wchar_t *restrict, va_list);
int vwprintf(const wchar_t *restrict, va_list);
int vswprintf(wchar_t *restrict, size_t,
const wchar_t *restrict, va_list);
int vswscanf(const wchar_t *restrict, const wchar_t *restrict,
va_list);
int vwscanf(const wchar_t *restrict, va_list);
size_t wcrtomb(char *restrict, wchar_t, mbstate_t *restrict);
wchar_t *wcscat(wchar_t *restrict, const wchar_t *restrict);
wchar_t *wcschr(const wchar_t *, wchar_t);
int wcscmp(const wchar_t *, const wchar_t *);
int wcscoll(const wchar_t *, const wchar_t *);
wchar_t *wcscpy(wchar_t *restrict, const wchar_t *restrict);
size_t wcscspn(const wchar_t *, const wchar_t *);
size_t wcsftime(wchar_t *restrict, size_t,
const wchar_t *restrict, const struct tm *restrict);
size_t wcslen(const wchar_t *);
wchar_t *wcsncat(wchar_t *restrict, const wchar_t *restrict, size_t);
int wcsncmp(const wchar_t *, const wchar_t *, size_t);
wchar_t *wcsncpy(wchar_t *restrict, const wchar_t *restrict, size_t);
wchar_t *wcspbrk(const wchar_t *, const wchar_t *);
wchar_t *wcsrchr(const wchar_t *, wchar_t);
size_t wcsrtombs(char *restrict, const wchar_t **restrict,
size_t, mbstate_t *restrict);
size_t wcsspn(const wchar_t *, const wchar_t *);
wchar_t *wcsstr(const wchar_t *restrict, const wchar_t *restrict);
double wcstod(const wchar_t *restrict, wchar_t **restrict);
float wcstof(const wchar_t *restrict, wchar_t **restrict);
wchar_t *wcstok(wchar_t *restrict, const wchar_t *restrict,
wchar_t **restrict);
long wcstol(const wchar_t *restrict, wchar_t **restrict, int);
long double wcstold(const wchar_t *restrict, wchar_t **restrict);
long long wcstoll(const wchar_t *restrict, wchar_t **restrict, int);
unsigned long wcstoul(const wchar_t *restrict, wchar_t **restrict, int);
unsigned long long
wcstoull(const wchar_t *restrict, wchar_t **restrict, int);
wchar_t *wcswcs(const wchar_t *, const wchar_t *);
int wcswidth(const wchar_t *, size_t);
size_t wcsxfrm(wchar_t *restrict, const wchar_t *restrict, size_t);
int wctob(wint_t);
wctype_t wctype(const char *);
int wcwidth(wchar_t);
wchar_t *wmemchr(const wchar_t *, wchar_t, size_t);
int wmemcmp(const wchar_t *, const wchar_t *, size_t);
wchar_t *wmemcpy(wchar_t *restrict, const wchar_t *restrict, size_t);
wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t);
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
int wprintf(const wchar_t *restrict, ...);
int wscanf(const wchar_t *restrict, ...);
The <wchar.h> header shall define the following macros:
WCHAR_MAX
The maximum value representable by an object of type wchar_t.
WCHAR_MIN
The minimum value representable by an object of type wchar_t.
WEOF Constant expression of type wint_t that is returned by several
WP functions to indicate end-of-file.
NULL As described in <stddef.h> .
The tag tm shall be declared as naming an incomplete structure type,
the contents of which are described in the header <time.h> .
Inclusion of the <wchar.h> header may make visible all symbols from
the headers <ctype.h>, <string.h>, <stdarg.h>, <stddef.h>, <stdio.h>,
<stdlib.h>, and <time.h>.
The following sections are informative.
APPLICATION USAGE
The iswblank() function was a late addition to the ISO C standard and
was introduced at the same time as the ISO C standard introduced
<wctype.h>, which contains all of the isw*() functions. The Open Group
Base Specifications had previously aligned with the MSE working draft
and had introduced the rest of the isw*() functions into <wchar.h>.
For backwards-compatibility, the original set of isw*() functions,
without iswblank(), are permitted (as an XSI extension) in <wchar.h>.
For maximum portability, applications should include <wctype.h> in
order to obtain declarations for the isw*() functions.
RATIONALE
In the ISO C standard, the symbols referenced as XSI extensions are in
<wctype.h>. Their presence here is thus an extension.
FUTURE DIRECTIONS
None.
SEE ALSO
<ctype.h> , <stdarg.h> , <stddef.h> , <stdio.h> , <stdlib.h> ,
<string.h> , <time.h> , <wctype.h> , the System Interfaces volume of
IEEE Std 1003.1-2001, btowc(), confstr(), fgetwc(), fgetws(),
fputwc(), fputws(), fwide(), fwprintf(), fwscanf(), getwc(),
getwchar(), iswalnum(), iswalpha(), iswcntrl(), iswctype(),
iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(),
iswspace(), iswupper(), iswxdigit(), iswctype(), mbsinit(), mbrlen(),
mbrtowc(), mbsrtowcs(), putwc(), putwchar(), swprintf(), swscanf(),
towlower(), towupper(), ungetwc(), vfwprintf(), vfwscanf(), vsw-
printf(), vswscanf(), vwscanf(), wcrtomb(), wcsrtombs(), wcscat(),
wcschr(), wcscmp(), wcscoll(), wcscpy(), wcscspn(), wcsftime(),
wcslen(), wcsncat(), wcsncmp(), wcsncpy(), wcspbrk(), wcsrchr(),
wcsspn(), wcsstr(), wcstod(), wcstof(), wcstok(), wcstol(), wcstold(),
wcstoll(), wcstoul(), wcstoull(), wcswcs(), wcswidth(), wcsxfrm(),
wctob(), wctype(), wcwidth(), wmemchr(), wmemcmp(), wmemcpy(), wmem-
move(), wmemset(), wprintf(), wscanf(), the Shell and Utilities volume
of IEEE Std 1003.1-2001, getconf
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- 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 .
POSIX 2003 <wchar.h>(P)
