mblen - determine number of bytes in next multibyte character
#include <stdlib.h>
int mblen(const char *s, size_t n);
If
s is not NULL, the
mblen() function inspects at most
n
bytes of the multibyte string starting at
s and extracts the next
complete multibyte character. It uses a static anonymous shift state known
only to the
mblen() function. If the multibyte character is not the
null wide character, it returns the number of bytes that were consumed from
s. If the multibyte character is the null wide character, it returns 0.
If the
n bytes starting at
s do not contain a complete multibyte
character,
mblen() returns -1. This can happen even if
n is
greater than or equal to
MB_CUR_MAX, if the multibyte string contains
redundant shift sequences.
If the multibyte string starting at
s contains an invalid multibyte
sequence before the next complete character,
mblen() also returns -1.
If
s is NULL, the
mblen() function resets the shift state, known
to only this function, to the initial state, and returns nonzero if the
encoding has nontrivial shift state, or zero if the encoding is stateless.
The
mblen() function returns the number of bytes parsed from the
multibyte sequence starting at
s, if a non-null wide character was
recognized. It returns 0, if a null wide character was recognized. It returns
-1, if an invalid multibyte sequence was encountered or if it couldn't parse a
complete multibyte character.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| mblen () |
Thread safety |
MT-Unsafe race |
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of
mblen() depends on the
LC_CTYPE category of the
current locale.
The function
mbrlen(3) provides a better interface to the same
functionality.
mbrlen(3)