标准库标头 <wchar.h> (C95)

 

C

编译器支持

语言

头文件

类型支持

程序工具

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

<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)

 

此标头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)	转换宽字符串为整数 (函数)
wcstoulwcstoull (C95)(C99)	转换宽字符串为无符号整数 (函数)
wcstofwcstodwcstold (C99)(C95)(C99)	转换宽字符串为浮点数 (函数)
字符串操纵
wcscpywcscpy_s (C95)(C11)	复制宽字符串给另一个 (函数)
wcsncpywcsncpy_s (C95)(C11)	复制字符串一定量的宽字符到另一个 (函数)
wcscatwcscat_s (C95)(C11)	追加一个宽字符串的副本到另一个 (函数)
wcsncatwcsncat_s (C95)(C11)	追加宽字符串中的一定量宽字符串到另一个 (函数)
wcsxfrm (C95)	变换宽字符串，使得 wcscmp 会产生与 wcscoll 相同的结果 (函数)
字符串检验
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)	比较来自两个宽字符串的一定量字符 (函数)
wcscoll (C95)	根据当前本地环境比较两个宽字符串 (函数)
wcschr (C95)	查找宽字符在宽字符串中的首次出现 (函数)
wcsrchr (C95)	查找宽字符在宽字符串中的最后一次出现 (函数)
wcsspn (C95)	返回仅由另一个宽字符串中出现的宽字符分隔的最长首段长度 (函数)
wcscspn (C95)	返回仅由不 出现于另一个宽字符串中的宽字符分隔的最长首段长度 (函数)
wcspbrk (C95)	查找一个宽字符串中的任何字符在另一个宽字符串中的首个位置 (函数)
wcsstr (C95)	查找一个宽字符串在另一个宽字符串中的首次出现 (函数)
wcstokwcstok_s (C95)(C11)	查找宽字符串中的下一个记号 (函数)
宽字符数组操纵
wmemcpywmemcpy_s (C95)(C11)	在两个不重叠的数组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)	在宽字符数组中查找宽字符的首次出现 (函数)
wmemset (C95)	复制给定的宽字符到宽字符数组的所有位置 (函数)

类型

wchar_t	可以保有任意有效宽字符的整数类型 (typedef)
wint_t (C95)	可以保有任意有效宽字符和至少一个额外值的整数类型 (typedef)

宏

WEOF (C95)	wint_t 类型的非字符值，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 /* 见描述 */ wchar_t;
typedef /* 见描述 */ size_t;
typedef /* 见描述 */ mbstate_t;
typedef /* 见描述 */ wint_t;
 
struct tm { /* 见描述 */ };
 
#define MB_UTF16    /* 见描述 */
#define MB_UTF32    /* 见描述 */
#define MB_UTF8     /* 见描述 */
#define NULL        /* 见描述 */
#define WCHAR_MAX   /* 见描述 */
#define WCHAR_MIN   /* 见描述 */
#define WCHAR_UTF16 /* 见描述 */
#define WCHAR_UTF32 /* 见描述 */
#define WCHAR_UTF8  /* 见描述 */
#define WCHAR_WIDTH /* 见描述 */
#define WEOF        /* 见描述 */
 
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__：

_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__，并且用户代码在对 <wchar.h> 的所有包含前定义了 __STDC_WANT_IEC_60559_TYPES_EXT__：

#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__，并且用户代码在对 <wchar.h> 的所有包含前定义了 __STDC_WANT_LIB_EXT1__：

#ifdef __STDC_WANT_LIB_EXT1__
typedef /* 见描述 */ errno_t;
typedef /* 见描述 */ 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