Each of the
wcscoll functions compares two strings according to the
LC_COLLATE category setting of the locale code page currently in use. Each of the
_mbscoll functions compares two strings according to the multibyte code page currently in use. Use the
coll functions for string comparisons when there is a difference between the character set order and the lexicographic character order in the current code page and this difference is of interest for the comparison. Use the corresponding
cmp functions to test only for string equality.
|strcoll||wcscoll||_mbscoll||Collate two strings|
|_stricoll||_wcsicoll||_mbsicoll||Collate two strings (case insensitive)|
The single-byte character (SBCS) versions of these functions (
string2 according to the
LC_COLLATE category setting of the current locale. These functions differ from the corresponding
strcmp functions in that the
strcoll functions use locale code page information that provides collating sequences. For string comparisons in locales in which the character set order and the lexicographic character order differ, the
strcoll functions should be used rather than the corresponding
strcmp functions. For more information on
LC_COLLATE, see setlocale.
For some code pages and corresponding character sets, the order of characters in the character set may differ from the lexicographic character order. In the "C" locale, this is not the case: the order of characters in the ASCII character set is the same as the lexicographic order of the characters. However, in certain European code pages, for example, the character 'a' (value 0x61) precedes the character 'ä' (value 0xE4) in the character set, but the character 'ä' precedes the character 'a' lexicographically. To perform a lexicographic comparison in such an instance, use
strcoll rather than
strcmp. Alternatively, you can use
strxfrm on the original strings, then use
strcmp on the resulting strings.
_strnicoll automatically handle multibyte-character strings according to the locale code page currently in use, as do their wide-character (Unicode) counterparts. The multibyte-character (MBCS) versions of these functions, however, collate strings on a character basis according to the multibyte code page currently in use.
coll functions collate strings lexicographically for comparison, whereas the
cmp functions simply test for string equality, the
coll functions are much slower than the corresponding
cmp versions. Therefore, the
coll functions should be used only when there is a difference between the character set order and the lexicographic character order in the current code page and this difference is of interest for the string comparison.
_mbsnbcoll, _mbsnbcoll_l, _mbsnbicoll, _mbsnbicoll_l
strcmp, wcscmp, _mbscmp
strncmp, wcsncmp, _mbsncmp, _mbsncmp_l
_strnicmp, _wcsnicmp, _mbsnicmp, _strnicmp_l, _wcsnicmp_l, _mbsnicmp_l
strxfrm, wcsxfrm, _strxfrm_l, _wcsxfrm_l
Send feedback about: