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MBRLEN(3) Linux Programmer's Manual MBRLEN(3)
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 are undefined.
If ps is a NULL pointer, a static anonymous state only known to the mbrlen function is
The mbrlen function returns the number of bytes parsed from the multibyte sequence start-
ing at s, if a non-null wide character was recognized. It returns 0, if a null wide char-
acter 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 com-
plete multibyte character, meaning that n should be increased.
ISO/ANSI C, UNIX98
The behaviour of mbrlen depends on the LC_CTYPE category of the current locale.
GNU 1999-07-25 MBRLEN(3)
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