NAME

wchar.h - wide-character handling

SYNOPSIS

#include <wchar.h>

DESCRIPTION

^[CX] 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 <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

^[XSI] A scalar type of a data object that can hold values which represent locale-specific character classification.

mbstate_t

An object type other than an array type that can hold the conversion state information necessary to convert between sequences of (possibly multi-byte) characters and wide characters. ^[XSI]  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

^[XSI] As described in <stdio.h>.

size_t

As described in <stddef.h>.

va_list

^[XSI] 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);
[XSI]
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, ...);
[XSI]
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);
[XSI]
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);
[XSI]
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>.

^[CX] 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>.

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(), vswprintf(), 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(), wmemmove(), wmemset(), wprintf(), wscanf(), the Shell and Utilities volume of IEEE Std 1003.1-2001, getconf

CHANGE HISTORY

First released in Issue 4.

Issue 5

Aligned with the ISO/IEC 9899:1990/Amendment 1:1995 (E).

Issue 6

The Open Group Corrigendum U021/10 is applied. The prototypes for wcswidth() and wcwidth() are marked as extensions.

The Open Group Corrigendum U028/5 is applied, correcting the prototype for the mbsinit() function.

The following changes are made for alignment with the ISO/IEC 9899:1999 standard:

• Various function prototypes are updated to add the restrict keyword.

• The functions vfwscanf(), vswscanf(), wcstof(), wcstold(), wcstoll(), and wcstoull() are added.

The type wctype_t, the isw*(), to*(), and wctype() functions are marked as XSI extensions.

IEEE Std 1003.1-2001/Cor 1-2002, item XBD/TC1/D6/26 is applied, adding the APPLICATION USAGE section.