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FE_ALL_EXCEPT FE_DFL_ENV FE_DIVBYZERO FE_DOWNWARD FE_INEXACT FE_INVALID FE_OVERFLOW FE_TONEAREST FE_TOWARDZERO FE_UNDERFLOW FE_UPWARD Floating-point environment float_t floor floorf floorl fma fmaf fmal fmax fmaxf fmaxl fmin fminf fminl fmod fmodf fmodl fpclassify FP_INFINITE FP_NAN FP_NORMAL FP_SUBNORMAL FP_ZERO frexp frexpf frexpl HUGE_VAL HUGE_VALF HUGE_VALL hypot hypotf hypotl I ilogb ilogbf ilogbl imaginary imaxabs imaxdiv INFINITY isfinite isgreater isgreaterequal isinf isless islessequal islessgreater isnan isnormal isunordered labs ldexp ldexpf ldexpl ldiv lgamma lgammaf lgammal llabs lldiv llrint llrintf llrintl llround llroundf llroundl log log10 log10f log10l log1p log1pf log1pl log2 log2f log2l logb logbf logbl logf logl lrint lrintf lrintl lround lroundf lroundl MATH_ERREXCEPT math_errhandling MATH_ERRNO modf modff modfl nan NAN nanf nanl nearbyint nearbyintf nearbyintl nextafter nextafterf nextafterl nexttoward nexttowardf nexttowardl Numerics pow powf powl Pseudo-random number generation rand RAND_MAX remainder remainderf remainderl remquo remquof remquol rint rintf rintl round roundf roundl scalbln scalblnf scalblnl scalbn scalbnf scalbnl signbit sin sinf sinh sinhf sinhl sinl sqrt sqrtf sqrtl srand tan tanf tanh tanhf tanhl tanl tgamma tgammaf tgammal trunc truncf truncl Type-generic math _Complex_I _Imaginary_I Program support abort atexit at_quick_exit exit EXIT_FAILURE EXIT_SUCCESS getenv getenv_s jmp_buf longjmp Program support utilities quick_exit raise setjmp SIGABRT SIGFPE SIGILL SIGINT signal SIGSEGV SIGTERM sig_atomic_t SIG_DFL SIG_ERR SIG_IGN system _Exit Strings atof atoi atol atoll btowc c16rtomb c32rtomb char16_t char32_t isalnum isalpha isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit mblen mbrlen mbrtoc16 mbrtoc32 mbrtowc mbsinit mbsrtowcs mbsrtowcs_s mbstate_t mbstowcs mbstowcs_s mbtowc memchr memcmp memcpy memcpy_s memmove memmove_s memset memset_s Null-terminated byte strings Null-terminated multibyte strings Null-terminated wide strings strcat strcat_s strchr strcmp strcoll strcpy strcpy_s strcspn strerror strerrorlen_s strerror_s Strings library strlen strncat Thread support call_once cnd_broadcast cnd_destroy cnd_init cnd_signal cnd_timedwait cnd_wait mtx_destroy mtx_init mtx_lock mtx_plain mtx_recursive mtx_timed mtx_timedlock mtx_trylock mtx_unlock once_flag ONCE_FLAG_INIT thrd_busy thrd_create thrd_current thrd_detach thrd_equal thrd_error thrd_exit thrd_join thrd_nomem thrd_sleep thrd_success thrd_timedout thrd_yield Thread support library thread_local tss_create tss_delete TSS_DTOR_ITERATIONS tss_get tss_set Type support Boolean type support library Fixed width integer types FLT_EVAL_METHOD FLT_ROUNDS max_align_t NULL Numeric limits offsetof ptrdiff_t size_t Type support Variadic functions Variadic functions va_arg va_copy va_end va_list va_start
文字

在头文件<wchar.h>中定义




(1)


size_t mbsrtowcs(wchar_t * dst,const char * src,size_t len,mbstate_t * ps);

(自C95以来)


size_t mbsrtowcs(wchar_t * restrict dst,const char ** restrict src,size_t len,mbstate_t * restrict ps);

(自C99以来)


errno_t mbsrtowcs_s(size_t * restrict retval,wchar_t * restrict dst,rsize_t dstsz,const char ** restrict src,rsize_t len,mbstate_t * restrict ps);

(2)

(自C11以来)

1)将由* ps描述的转换状态开始的以空字符结尾的多字节字符序列从第一个元素由* src指向的数组转换为宽字符表示形式。 如果dst不为空,则转换的字符将存储在由dst指向的wchar_t数组的连续元素中。 不超过len宽字符被写入目标数组。 每个多字节字符转换就像通过调用mbrtowc。 在下列情况下停止转换:

*多字节空字符已转换并存储。 * src设置为NULL,* ps代表初始转换状态。

*遇到了一个无效的多字节字符(根据当前的C语言环境)。 * src被设置为指向第一个未转换的多字节字符的开头。

*要存储的下一个宽字符将超过len。 * src被设置为指向第一个未转换的多字节字符的开头。 如果dst == NULL,则不检查此条件。

2)与(1)相同,除以下情况:

*该函数将其结果作为out参数返回 retval

*如果写完len宽字符后没有空字符写入dst,则L'\ 0'存储在dst [len]中,这意味着写入len + 1总宽字符

*该函数从终止空值到dstsz之间破坏目标数组

*如果src和dst重叠,则行为未指定。

*在运行时检测到以下错误并调用当前安装的约束处理函数:

  • retval,ps,src或* src是空指针

  • dstsz或len大于RSIZE_MAX / sizeof(wchar_t)(除非dst为空)

  • dstsz不为零(除非dst为空)

  • * src数组中的第一个dstsz多字节字符中没有空字符,并且len大于dstsz(除非dst为空)

作为所有边界检查函数,只有当__STDC_LIB_EXT1__由实现定义并且在包含wchar.h之前用户将__STDC_WANT_LIB_EXT1__定义为整数常量1时,mbsrtowcs_s才能保证可用。

参数

dst

-

指向宽字符数组的地方,结果将被存储

src

-

指向指向空终止的多字节字符串的第一个元素的指针

len

-

由dst指向的数组中可用的宽字符数

ps

-

指向转换状态对象的指针

dstsz

-

将写入的最大宽字符数(dst数组的大小)

retval

-

指向将存储结果的size_t对象的指针

返回值

1)成功时,返回写入字符数组中的宽字符数,不包括终止的L'\ 0'。 如果dst == NULL,则返回给定无限长度的宽字符数。 在转换错误(如果遇到无效多字节字符)时,返回(size_t)-1,将EILSEQ存储在errno中,并使* ps处于未指定状态。

2)成功时为零(在这种情况下,不包括终止零的宽字符的数量已经或将被写入dst,存储在* retval中),非错误发生。 在违反运行时约束的情况下,* retval中的stores(size_t)-1(除非retval为null)并将dst [0]设置为L'\ 0'(除非dst为null或dstmax为零或大于RSIZE_MAX)

#include <stdio.h>#include <locale.h>#include <wchar.h>#include <string.h> void print_as_wide(const char* mbstr){
    mbstate_t state;    memset(&state, 0, sizeof state);
    int len = 1 + mbsrtowcs(NULL, &mbstr, 0, &state);
    wchar_t wstr[len];    mbsrtowcs(&wstr[0], &mbstr, len, &state);    wprintf(L"Wide string: %ls \n", wstr);    wprintf(L"The length, including L'\\0': %d\n", len);}
 int main(void){    setlocale(LC_ALL, "en_US.utf8");    print_as_wide(u8"z\u00df\u6c34\U0001f34c"); // u8"zß水?"}

输出:

Wide string: zß水?The length, including L'\0': 5

参考

  • C11标准(ISO / IEC 9899:2011):

    • 7.29.6.4.1 mbsrtowcs函数(p:445)

    • K.3.9.3.2.1 mbsrtowcs_s函数(p:648-649)

  • C99标准(ISO / IEC 9899:1999):

    • 7.24.6.4.1 mbsrtowcs函数(p:391)

扩展内容

mbstowcsmbstowcs_s(C11)

将窄多字节字符串转换为宽字符串(函数)

mbrtowc(C95)

将下一个多字节字符转换为宽字符,给定状态(函数)

wcsrtombswcsrtombs_s(C95)(C11)

将宽字符串转换为窄多字节字符串,给定状态(函数)

| mbsrtowcs的C ++文档 |

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在头文件<wctype.h>中定义



int iswdigit(wint_t ch);


(自C95以来)

检查给定的宽字符是否对应(如果缩小)十个十进制数字字符0123456789中的一个。

参数

CH

-

宽字符

返回值

如果宽字符是数字字符,则为非零值,否则为零。

注意

iswdigitiswxdigit是唯一不受当前安装的C语言环境影响的标准宽字符分类函数。

一些语言环境提供了检测非ASCII数字的附加字符类。

#include <stdio.h>#include <wctype.h>#include <wchar.h>#include <locale.h> void test(wchar_t a3, wchar_t u3, wchar_t j3){    printf("        '%lc' '%lc' '%lc'\n", a3, u3, j3);    printf("iswdigit %d    %d   %d\n",           !!iswdigit(a3), !!iswdigit(u3), !!iswdigit(j3));    printf("jdigit:  %d    %d   %d\n", !!iswctype(a3, wctype("jdigit")),          !!iswctype(u3, wctype("jdigit")),          !!iswctype(j3, wctype("jdigit")));}
 int main(void){
    wchar_t a3 = L'3';  // the ASCII digit 3
    wchar_t u3 = L'三'; // the CJK numeral 3
    wchar_t j3 = L'3'; // the fullwidth digit 3 
    setlocale(LC_ALL, "en_US.utf8");    puts("In American locale:");    test(a3, u3, j3); 
    setlocale(LC_ALL, "ja_JP.utf8");    puts("\nIn Japanese locale:");    test(a3, u3, j3);}

输出:

In American locale:        '3' '三' '3'iswdigit 1    0   0jdigit:  0    0   0
 In Japanese locale:        '3' '三' '3'iswdigit 1    0   0jdigit:  0    0   1

参考

  • C11标准(ISO / IEC 9899:2011):

    • 7.30.2.1.5 iswdigit函数(p:449)

  • C99标准(ISO / IEC 9899:1999):

    • 7.25.2.1.5 iswdigit函数(p:395)

扩展内容

isdigit

检查一个字符是否是一个数字(功能)

| 用于iswdigit的C ++文档 |

ASCII 值  (十六进制)

字符

iscntrl  iswcntrl.

isprint  iswprint.

isspace  iswspace.

isblank  iswblank.

isgraph  iswgraph.

ispunct  iswpunct.

isalnum  iswalnum.

isalpha  iswalpha.

isupper  iswupper.

islower  iswlower.

isdigit  iswdigit.

isxdigit  iswxdigit.


0 - 8

0x00-0x08

控制码 (NUL, etc.)

≠0

0

0

0

0

0

0

0

0

0

0

0

9

0x09

tab (\t)

≠0

0

≠0

≠0

0

0

0

0

0

0

0

0

10 - 13

0x0A-0x0D

空格 (\n,\v,\f,\r)

≠0

0

≠0

0

0

0

0

0

0

0

0

0

14 - 31

0x0E-0x1F

控制码

≠0

0

0

0

0

0

0

0

0

0

0

0

32

0x20

space

0

≠0

≠0

≠0

0

0

0

0

0

0

0

0

33 - 47

0x21-0x2F

!"#$%&'()*+,-./

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

48 - 57

0x30-0x39

0123456789

0

≠0

0

0

≠0

0

≠0

0

0

0

≠0

≠0

58 - 64

0x3a-0x40

:;<=>?@

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

65 - 70

0x41-0x46

ABCDEF

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

≠0

71 - 90

0x47-0x5A

GHIJKLMNOPQRSTUVWXYZ

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

0

91 - 96

0x5B-0x60

[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |













97 -102

0x61-0x66

abcdef

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

≠0

103-122

0x67-0x7A

ghijklmnopqrstuvwxyz

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

0

123-126

0x7B-0x7E

{|}~

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

127

0x7F

退格 (DEL)

≠0

0

0

0

0

0

0

0

0

0

0

0

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