_mbsnbcnt, _mbsnbcnt_l, _mbsnccnt, _mbsnccnt_l, _strncnt, _wcsncnt
Returns the number of characters or bytes within a supplied count.
size_t _mbsnbcnt(
const unsigned char *str,
size_t count
);
size_t _mbsnbcnt_l(
const unsigned char *str,
size_t count,
_locale_t locale
);
size_t _mbsnccnt(
const unsigned char *str,
size_t count
);
size_t _mbsnccnt_l(
const unsigned char *str,
size_t count,
_locale_t locale
);
size_t _strncnt(
const char *str,
size_t count
);
size_t _wcsncnt(
const wchar_t *str,
size_t count
);
Parámetros
str
String to be examined.count
Number of characters or bytes to be examined in str.locale
Locale to use.
Valor devuelto
_mbsnbcnt and _mbsnbcnt_l return the number of bytes found in the first count of multibyte characters of str. _mbsnccnt and _mbsnccnt_l return the number of characters found in the first count of bytes of str. If a NULL character is encountered before the examination of str has completed, they return the number of bytes or characters found before the NULL character. If str consists of fewer than count characters or bytes, they return the number of characters or bytes in the string. If count is less than zero, they return 0. In previous versions, these functions had a return value of type int rather than size_t.
_strncnt returns the number of characters in the first count bytes of the single-byte string str. _wcsncnt returns the number of characters in the first count wide characters of the wide-character string str.
Comentarios
_mbsnbcnt and _mbsnbcnt_l count the number of bytes found in the first count of multibyte characters of str. _mbsnbcnt and _mbsnbcnt_l replace mtob and should be used in place of mtob.
_mbsnccnt and _mbsnccnt_l count the number of characters found in the first count of bytes of str. If _mbsnccnt and _mbsnccnt_l encounter a NULL in the second byte of a double-byte character, the first byte is also considered to be NULL and is not included in the returned count value. _mbsnccnt and _mbsnccnt_l replace btom and should be used in place of btom.
If str is a null pointer or is count is 0, these functions invoke the invalid parameter handler as described in Parameter Validation, errno is set to EINVAL, and the function returns 0.
The output value is affected by the setting of the LC_CTYPE category setting of the locale; see setlocale for more information. The versions of these functions without the _l suffix use the current locale for this locale-dependent behavior; the versions with the _l suffix are identical except that they use the locale parameter passed in instead. For more information, see Locale.
Generic-Text Routine Mappings
Routine |
_UNICODE and _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
_tcsnbcnt |
_strncnt |
_mbsnbcnt |
_wcsncnt |
_tcsnccnt |
_strncnt |
_mbsnbcnt |
n/a |
_wcsncnt |
n/a |
n/a |
_mbsnbcnt |
_wcsncnt |
n/a |
n/a |
_mbsnccnt |
n/a |
n/a |
_mbsnbcnt_l |
_mbsnccnt_l |
Requisitos
Routine |
Required header |
|---|---|
_mbsnbcnt |
<mbstring.h> |
_mbsnbcnt_l |
<mbstring.h> |
_mbsnccnt |
<mbstring.h> |
_mbsnccnt_l |
<mbstring.h> |
_strncnt |
<tchar.h> |
_wcsncnt |
<tchar.h> |
For more compatibility information, see Compatibility in the Introduction.
Ejemplo
// crt_mbsnbcnt.c
#include <mbstring.h>
#include <stdio.h>
int main( void )
{
unsigned char str[] = "This is a multibyte-character string.";
unsigned int char_count, byte_count;
char_count = _mbsnccnt( str, 10 );
byte_count = _mbsnbcnt( str, 10 );
if ( byte_count - char_count )
printf( "The first 10 characters contain %d multibyte characters\n", char_count );
else
printf( "The first 10 characters are single-byte. \n");
}
Output
The first 10 characters are single-byte.
Equivalente en .NET Framework
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.