标准库头文件 <wchar.h> (C95)

 

C

编译器支持

语言

头文件

类型支持

程序实用工具

可变参数函数支持

错误处理

动态内存管理

字符串库

算法

数值

日期和时间实用工具

输入/输出支持

本地化支持

并发支持 (C11)

技术规范

符号索引

 

标准库头文件

<assert.h> <complex.h> (C99) <ctype.h> <errno.h> <fenv.h> (C99) <float.h> <inttypes.h> (C99)     <iso646.h> (C95) <limits.h> <locale.h> <math.h>

<setjmp.h> <signal.h> <stdalign.h> (C11*) <stdarg.h> <stdatomic.h> (C11)     <stdbit.h> (C23) <stdbool.h> (C99*) <stdckdint.h> (C23) <stddef.h> <stdint.h> (C99) <stdio.h>

<stdlib.h> <stdmchar.h> (C29) <stdnoreturn.h> (C11*) <string.h> <tgmath.h> (C99) <threads.h> (C11) <time.h> <uchar.h> (C11) <wchar.h> (C95) <wctype.h> (C95)

 

此头文件是 空终止宽字符串 库的一部分。

函数

转换为数值格式
wcstolwcstoll (C95)(C99)	将宽字符串转换为整数值 (函数)
wcstoulwcstoull (C95)(C99)	将宽字符串转换为无符号整数值 (函数)
wcstofwcstodwcstold (C99)(C95)(C99)	将宽字符串转换为浮点数值 (函数)
字符串操作
wcscpywcscpy_s (C95)(C11)	将一个宽字符串复制到另一个宽字符串 (函数)
wcsncpywcsncpy_s (C95)(C11)	从一个字符串向另一个字符串复制一定数量的宽字符 (函数)
wcscatwcscat_s (C95)(C11)	将一个宽字符串的副本追加到另一个宽字符串 (函数)
wcsncatwcsncat_s (C95)(C11)	将一个宽字符串中一定数量的宽字符追加到另一个宽字符串 (函数)
wcsxfrm (C95)	转换宽字符串，使得 wcscmp 产生与 wcscoll 相同的结果 (函数)
字符串检查
wcslenwcsnlen_s (C95)(C11)	返回宽字符串的长度 (函数)
wcscmp (C95)	比较两个宽字符串 (函数)
wcsncmp (C95)	比较两个宽字符串中一定数量的字符 (函数)
wcscoll (C95)	根据当前区域设置比较两个宽字符串 (函数)
wcschr (C95)	在一个宽字符串中查找宽字符的首次出现 (函数)
wcsrchr (C95)	在一个宽字符串中查找宽字符的最后一次出现 (函数)
wcsspn (C95)	返回最大初始段的长度，该初始段由 仅由在另一个宽字符串中找到的宽字符组成 (函数)
wcscspn (C95)	返回最大初始段的长度，该初始段由 仅由未在另一个宽字符串中找到的宽字符组成 (函数)
wcspbrk (C95)	在一个宽字符串中查找任何宽字符在另一个宽字符串中的首次出现位置 (函数)
wcsstr (C95)	在一个宽字符串中查找另一个宽字符串的首次出现 (函数)
wcstokwcstok_s (C95)(C11)	在一个宽字符串中查找下一个标记 (函数)
宽字符数组操作
wmemcpywmemcpy_s (C95)(C11)	在两个非重叠数组之间复制一定数量的宽字符 (函数)
wmemmovewmemmove_s (C95)(C11)	在两个可能重叠的数组之间复制一定数量的宽字符 (函数)
wmemcmp (C95)	比较两个数组中一定数量的宽字符 (函数)
wmemchr (C95)	在一个宽字符数组中查找宽字符的首次出现 (函数)
wmemset (C95)	将给定的宽字符复制到宽字符数组的每个位置 (函数)

类型

wchar_t	可以容纳任何有效宽字符的整数类型 (类型定义)
wint_t (C95)	可以容纳任何有效宽字符以及至少一个其他值的整数类型 (类型定义)

宏

WEOF (C95)	类型为 wint_t 的非字符值，用于指示错误 (宏常量)
WCHAR_MIN (C95)	wchar_t 的最小有效值 (宏常量)
WCHAR_MAX (C95)	wchar_t 的最大有效值 (宏常量)

概要

#define __STDC_VERSION_WCHAR_H__ 202311L
 
typedef /* see description */ wchar_t;
typedef /* see description */ size_t;
typedef /* see description */ mbstate_t;
typedef /* see description */ wint_t;
 
struct tm { /* see description */ };
 
#define MB_UTF16    /* see description */
#define MB_UTF32    /* see description */
#define MB_UTF8     /* see description */
#define NULL        /* see description */
#define WCHAR_MAX   /* see description */
#define WCHAR_MIN   /* see description */
#define WCHAR_UTF16 /* see description */
#define WCHAR_UTF32 /* see description */
#define WCHAR_UTF8  /* see description */
#define WCHAR_WIDTH /* see description */
#define WEOF        /* see description */
 
int fwprintf(FILE* restrict stream, const wchar_t* restrict format, ...);
int fwscanf(FILE* restrict stream, const wchar_t* restrict format, ...);
int swprintf(wchar_t* restrict s, size_t n, const wchar_t* restrict format, ...);
int swscanf(const wchar_t* restrict s, const wchar_t* restrict format, ...);
int vfwprintf(FILE* restrict stream, const wchar_t* restrict format, va_list arg);
int vfwscanf(FILE* restrict stream, const wchar_t* restrict format, va_list arg);
int vswprintf(wchar_t* restrict s, size_t n, const wchar_t* restrict format,
              va_list arg);
int vswscanf(const wchar_t* restrict s, const wchar_t* restrict format, va_list arg);
int vwprintf(const wchar_t* restrict format, va_list arg);
int vwscanf(const wchar_t* restrict format, va_list arg);
int wprintf(const wchar_t* restrict format, ...);
int wscanf(const wchar_t* restrict format, ...);
wint_t fgetwc(FILE* stream);
wchar_t* fgetws(wchar_t* restrict s, int n, FILE* restrict stream);
wint_t fputwc(wchar_t c, FILE* stream);
int fputws(const wchar_t* restrict s, FILE* restrict stream);
int fwide(FILE* stream, int mode);
wint_t getwc(FILE* stream);
wint_t getwchar(void);
wint_t putwc(wchar_t c, FILE* stream);
wint_t putwchar(wchar_t c);
wint_t ungetwc(wint_t c, FILE* stream);
double wcstod(const wchar_t* restrict nptr, wchar_t** restrict endptr);
float wcstof(const wchar_t* restrict nptr, wchar_t** restrict endptr);
long double wcstold(const wchar_t* restrict nptr, wchar_t** restrict endptr);
long int wcstol(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base);
long long int wcstoll(const wchar_t* restrict nptr, wchar_t** restrict endptr, int base);
unsigned long int wcstoul(const wchar_t* restrict nptr, wchar_t** restrict endptr,
                          int base);
unsigned long long int wcstoull(const wchar_t* restrict nptr, wchar_t** restrict endptr,
                                int base);
wchar_t* wcscpy(wchar_t* restrict s1, const wchar_t* restrict s2);
wchar_t* wcsncpy(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
wchar_t* wmemcpy(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
wchar_t* wmemmove(wchar_t* s1, const wchar_t* s2, size_t n);
wchar_t* wcscat(wchar_t* restrict s1, const wchar_t* restrict s2);
wchar_t* wcsncat(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
int wcscmp(const wchar_t* s1, const wchar_t* s2);
int wcscoll(const wchar_t* s1, const wchar_t* s2);
int wcsncmp(const wchar_t* s1, const wchar_t* s2, size_t n);
size_t wcsxfrm(wchar_t* restrict s1, const wchar_t* restrict s2, size_t n);
int wmemcmp(const wchar_t* s1, const wchar_t* s2, size_t n);
/*QWchar_t*/* wcschr(/*QWchar_t*/* s, wchar_t c);
size_t wcscspn(const wchar_t* s1, const wchar_t* s2);
/*QWchar_t*/* wcspbrk(/*QWchar_t*/* s1, const wchar_t* s2);
/*QWchar_t*/* wcsrchr(/*QWchar_t*/* s, wchar_t c);
size_t wcsspn(const wchar_t* s1, const wchar_t* s2);
/*QWchar_t*/* wcsstr(/*QWchar_t*/* s1, const wchar_t* s2);
wchar_t* wcstok(wchar_t* restrict s1, const wchar_t* restrict s2,
                wchar_t** restrict ptr);
/*QWchar_t*/* wmemchr(/*QWchar_t*/* s, wchar_t c, size_t n);
size_t wcslen(const wchar_t* s);
size_t wcsnlen(const wchar_t* s, size_t n);
wchar_t* wmemset(wchar_t* s, wchar_t c, size_t n);
size_t wcsftime(wchar_t* restrict s, size_t maxsize, const wchar_t* restrict format,
                const struct tm* restrict timeptr);
wint_t btowc(int c);
int wctob(wint_t c);
int mbsinit(const mbstate_t* ps);
size_t mbrlen(const char* restrict s, size_t n, mbstate_t* restrict ps);
size_t mbrtowc(wchar_t* restrict pwc, const char* restrict s, size_t n,
               mbstate_t* restrict ps);
size_t wcrtomb(char* restrict s, wchar_t wc, mbstate_t* restrict ps);
size_t mbsrtowcs(wchar_t* restrict dst, const char** restrict src, size_t len,
                 mbstate_t* restrict ps);
size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
                 mbstate_t* restrict ps);

仅当实现定义了 __STDC_IEC_60559_DFP__ 时

_Decimal32 wcstod32(const wchar_t* restrict nptr, wchar_t** restrict endptr);
_Decimal64 wcstod64(const wchar_t* restrict nptr, wchar_t** restrict endptr);
_Decimal128 wcstod128(const wchar_t* restrict nptr, wchar_t** restrict endptr);

仅当实现定义了 __STDC_IEC_60559_TYPES__ 并且用户代码在包含 <wchar.h> 之前额外定义了 __STDC_WANT_IEC_60559_TYPES_EXT__ 时

#ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
/*_FloatN*/ /*wcstofN*/(const wchar_t* restrict nptr, wchar_t** restrict endptr);
/*_FloatNx*/ /*wcstofNx*/(const wchar_t* restrict nptr, wchar_t** restrict endptr);
/*_DecimalN*/ /*wcstodN*/(const wchar_t* restrict nptr, wchar_t** restrict endptr);
/*_DecimalNx*/ /*wcstodNx*/(const wchar_t* restrict nptr, wchar_t** restrict endptr);
void /*wcstoencfN*/(unsigned char encptr[restrict static N/8],
                    const wchar_t* restrict nptr, wchar_t** restrict endptr);
void /*wcstoencdecdN*/(unsigned char encptr[restrict static N/8],
                       const wchar_t* restrict nptr, wchar_t** restrict endptr);
void /*wcstoencbindN*/(unsigned char encptr[restrict static N/8],
                       const wchar_t* restrict nptr, wchar_t** restrict endptr);
#endif

仅当实现定义了 __STDC_LIB_EXT1__ 并且用户代码在包含 <wchar.h> 之前额外定义了 __STDC_WANT_LIB_EXT1__ 时

#ifdef __STDC_WANT_LIB_EXT1__
typedef /* see description */ errno_t;
typedef /* see description */ rsize_t;
 
int fwprintf_s(FILE* restrict stream, const wchar_t* restrict format, ...);
int fwscanf_s(FILE* restrict stream, const wchar_t* restrict format, ...);
int snwprintf_s(wchar_t* restrict s, rsize_t n, const wchar_t* restrict format, ...);
int swprintf_s(wchar_t* restrict s, rsize_t n, const wchar_t* restrict format, ...);
int swscanf_s(const wchar_t* restrict s, const wchar_t* restrict format, ...);
int vfwprintf_s(FILE* restrict stream, const wchar_t* restrict format, va_list arg);
int vfwscanf_s(FILE* restrict stream, const wchar_t* restrict format, va_list arg);
int vsnwprintf_s(wchar_t* restrict s, rsize_t n, const wchar_t* restrict format,
                 va_list arg);
int vswprintf_s(wchar_t* restrict s, rsize_t n, const wchar_t* restrict format,
                va_list arg);
int vswscanf_s(const wchar_t* restrict s, const wchar_t* restrict format, va_list arg);
int vwprintf_s(const wchar_t* restrict format, va_list arg);
int vwscanf_s(const wchar_t* restrict format, va_list arg);
int wprintf_s(const wchar_t* restrict format, ...);
int wscanf_s(const wchar_t* restrict format, ...);
errno_t wcscpy_s(wchar_t* restrict s1, rsize_t s1max, const wchar_t* restrict s2);
errno_t wcsncpy_s(wchar_t* restrict s1, rsize_t s1max, const wchar_t* restrict s2,
                  rsize_t n);
errno_t wmemcpy_s(wchar_t* restrict s1, rsize_t s1max, const wchar_t* restrict s2,
                  rsize_t n);
errno_t wmemmove_s(wchar_t* s1, rsize_t s1max, const wchar_t* s2, rsize_t n);
errno_t wcscat_s(wchar_t* restrict s1, rsize_t s1max, const wchar_t* restrict s2);
errno_t wcsncat_s(wchar_t* restrict s1, rsize_t s1max, const wchar_t* restrict s2,
                  rsize_t n);
wchar_t* wcstok_s(wchar_t* restrict s1, rsize_t* restrict s1max,
                  const wchar_t* restrict s2, wchar_t** restrict ptr);
size_t wcsnlen_s(const wchar_t* s, size_t maxsize);
errno_t wcrtomb_s(size_t* restrict retval, char* restrict s, rsize_t smax, wchar_t wc,
                  mbstate_t* restrict ps);
errno_t mbsrtowcs_s(size_t* restrict retval, wchar_t* restrict dst, rsize_t dstmax,
                    const char** restrict src, rsize_t len, mbstate_t* restrict ps);
errno_t wcsrtombs_s(size_t* restrict retval, char* restrict dst, rsize_t dstmax,
                    const wchar_t** restrict src, rsize_t len, mbstate_t* restrict ps);
#endif