_strnicmp, _wcsnicmp, _mbsnicmp, _strnicmp_l, _wcsnicmp_l, _mbsnicmp_l

Compares the specified number of characters of two strings without regard to case.

Syntax

int _strnicmp(
   const char *string1,
   const char *string2,
   size_t count
);
int _wcsnicmp(
   const wchar_t *string1,
   const wchar_t *string2,
   size_t count
);
int _mbsnicmp(
   const unsigned char *string1,
   const unsigned char *string2,
   size_t count
);
int _strnicmp_l(
   const char *string1,
   const char *string2,
   size_t count,
   _locale_t locale
);
int _wcsnicmp_l(
   const wchar_t *string1,
   const wchar_t *string2,
   size_t count,
   _locale_t locale
);
int _mbsnicmp_l(
   const unsigned char *string1,
   const unsigned char *string2,
   size_t count,
   _locale_t locale
);

Parameters

string1, string2
Null-terminated strings to compare.

count
Number of characters to compare.

locale
Locale to use.

Return value

Indicates the relationship between the substrings, as follows.

On a parameter validation error, these functions return _NLSCMPERROR, which is defined in <string.h> and <mbstring.h>.

Remarks

The _strnicmp function compares, at most, the first count characters of string1 and string2. The comparison is performed without regard to case by converting each character to lowercase. _strnicmp is a case-insensitive version of strncmp. The comparison ends if a terminating null character is reached in either string before count characters are compared. If the strings are equal when a terminating null character is reached in either string before count characters are compared, the shorter string is lesser.

The characters from 91 to 96 in the ASCII table ('[', '\', ']', '^', '_', and '`') evaluate as less than any alphabetic character. This ordering is identical to that of stricmp.

_wcsnicmp and _mbsnicmp are wide-character and multibyte-character versions of _strnicmp. The arguments of _wcsnicmp are wide-character strings. The arguments of _mbsnicmp are multibyte-character strings. _mbsnicmp recognizes multibyte-character sequences according to the current multibyte code page and returns _NLSCMPERROR on an error. For more information, see Code pages. These three functions behave identically otherwise. These functions are affected by the locale setting—the versions that don't have the _l suffix use the current locale for their locale-dependent behavior; the versions that do have the _l suffix instead 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, 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.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Generic-text routine mappings

Requirements

For more compatibility information, see Compatibility.

Example

See the example for strncmp.

See also

String manipulation
strcat, wcscat, _mbscat
strcmp, wcscmp, _mbscmp
strcpy, wcscpy, _mbscpy
strncat, _strncat_l, wcsncat, _wcsncat_l, _mbsncat, _mbsncat_l
strncmp, wcsncmp, _mbsncmp, _mbsncmp_l
strncpy, _strncpy_l, wcsncpy, _wcsncpy_l, _mbsncpy, _mbsncpy_l
strrchr, wcsrchr, _mbsrchr, _mbsrchr_l
_strset, _strset_l, _wcsset, _wcsset_l, _mbsset, _mbsset_l
strspn, wcsspn, _mbsspn, _mbsspn_l