mbrlen - determine number of bytes in next multibyte character
size_t mbrlen(const char *s, size_t n, mbstate_t *ps);
The mbrlen() function inspects at most n bytes of the multibyte string
starting at s and extracts the next complete multibyte character. It
updates the shift state *ps. 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
resets the shift state *ps to the initial state and returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, mbrlen() returns (size_t) -2. This can happen even if n >=
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, mbrlen() returns
(size_t) -1 and sets errno to EILSEQ. In this case, the effects on *ps
If ps is a NULL pointer, a static anonymous state only known to the
mbrlen() function is used instead.
The mbrlen() 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 (size_t) -1 and sets errno to EILSEQ, if an invalid multibyte
sequence was encountered. It returns (size_t) -2 if it couldn’t parse
a complete multibyte character, meaning that n should be increased.
The behavior of mbrlen() depends on the LC_CTYPE category of the
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