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Copyright 2014 Garrett D'Amore <garrett@damore.org>
#include <stdlib.h> int mblen(const char *s, size_t n);
#include <stdlib.h> #include <xlocale.h> int mblen_l(const char *s, size_t n, locale_t loc);
If s is not a null pointer, mblen() and mblen_l() determine the number of bytes constituting the character pointed to by s. The call
mblen(s, n);is equivalent to:
mbtowc((wchar_t *)0, s, n);A call with s as a null pointer causes this function to return 0.
Whereas the behavior of the mblen() function is affected by the LC_CTYPE category of the current locale, the behavior of mblen_l() is affected by the LC_CTYPE category of the locale specified by loc.
If s is a null pointer, mblen() and mblen_l() returns 0. It s is not a null pointer, mblen() and mblen_l() returns 0 (if s points to the null byte), the number of bytes that constitute the character (if the next n or fewer bytes form a valid character), or -1 (if they do not form a valid character) and may set errno to indicate the error. In no case will the value returned be greater than n or the value of the MB_CUR_MAX macro.
The mblen() and mblen_l() functions may fail if: EILSEQ
Invalid character sequence is detected.
See attributes(7) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| CSI Enabled |
| Interface Stability See below. |
| MT-Level MT-Safe |
The mblen() function is Standard. The mblen_l() function is Uncommitted.
mbstowcs(3C), mbtowc(3C), newlocale(3C), setlocale(3C), wcstombs(3C), wctomb(3C), uselocale(3C) attributes(7), standards (7)