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The latest version of this topic can be found at Interpretation of Multibyte-Character Sequences.
Most multibyte-character routines in the Microsoft run-time library recognize multibyte-character sequences relating to a multibyte code page. 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.
Locale-Dependent Multibyte Routines
| Routine | Use |
|---|---|
| _mbclen, mblen, _mblen_l | Validate and return number of bytes in multibyte character |
| strlen, wcslen, _mbslen, _mbslen_l, _mbstrlen, _mbstrlen_l | For multibyte character strings: validate each character in string; return string length. For wide character strings: return string length. |
| mbstowcs, _mbstowcs_l, mbstowcs_s, _mbstowcs_s_l | Convert sequence of multibyte characters to corresponding sequence of wide characters |
| mbtowc, _mbtowc_l | Convert multibyte character to corresponding wide character |
| wcstombs, _wcstombs_l, wcstombs_s, _wcstombs_s_l | Convert sequence of wide characters to corresponding sequence of multibyte characters |
| wctomb, _wctomb_l, wctomb_s, _wctomb_s_l | Convert wide character to corresponding multibyte character |