MBLEN(3) manual page
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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.
The mblen() function
is not thread-safe.
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)
This
page is part of release 3.78 of the Linux man-pages project. A description
of the project, information about reporting bugs, and the latest version
of this page, can be found at http://www.kernel.org/doc/man-pages/.
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