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_strncoll, _wcsncoll, _mbsncoll, _strncoll_l, _wcsncoll_l, _mbsncoll_l

Compares strings by using locale-specific information.

Important note Important

_mbsncoll and _mbsncoll_l cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

int _strncoll(
   const char *string1,
   const char *string2,
   size_t count 
);
int _wcsncoll(
   const wchar_t *string1,
   const wchar_t *string2,
   size_t count 
);
int _mbsncoll(
   const unsigned char *string1,
   const unsigned char *string2,
   size_t count 
);
int _strncoll_l(
   const char *string1,
   const char *string2,
   size_t count,
   _locale_t locale
);
int _wcsncoll_l(
   const wchar_t *string1,
   const wchar_t *string2,
   size_t count,
   _locale_t locale
);
int _mbsncoll_l(
   const unsigned char *string1,
   const unsigned char *string2,
   size_t count,
   _locale_t locale
);

string1, string2

Null-terminated strings to compare.

count

The number of characters to compare.

locale

The locale to use.

Each of these functions returns a value that indicates the relationship of the substrings of string1 and string2, as follows.

Return value

Relationship of string1 to string2

< 0

string1 is less than string2.

0

string1 is identical to string2.

> 0

string1 is greater than string2.

Each of these functions returns _NLSCMPERROR. To use _NLSCMPERROR, include either STRING.h or MBSTRING.h. _wcsncoll can fail if either string1 or string2 contains wide-character codes that are outside the domain of the collating sequence. When an error occurs, _wcsncoll may set errno to EINVAL. To check for an error on a call to _wcsncoll, set errno to 0 and then check errno after you call _wcsncoll.

Each of these functions performs a case-sensitive comparison of the first count characters in string1 and string2, according to the code page that's currently in use. Use these functions only when there is a difference between the character set order and the lexicographic character order in the code page, and when this difference is of interest for the string comparison. The character set order is locale-dependent. The versions of these functions that don't have the _l suffix use the current locale, but the versions that have the _l suffix use the locale that's passed in. For more information, see Locale.

All of these functions validate their parameters. If either string1 or string2 is a null pointer, or count is greater than INT_MAX, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, these functions return _NLSCMPERROR and set errno to EINVAL.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_tcsnccoll

_strncoll

_mbsncoll

_wcsncoll

_tcsncoll

_strncoll

_mbsnbcoll

_wcsncoll

Routine

Required header

_strncoll , _strncoll_l

<string.h>

_wcsncoll , _wcsncoll_l

<wchar.h> or <string.h>

_mbsncoll , _mbsncoll_l

<mbstring.h>

For additional compatibility information, see Compatibility.

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