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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
MBLEN(3) Linux Programmer's Manual MBLEN(3)
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)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 MBLEN(3)
Pages that refer to this page: MB_CUR_MAX(3), mbstowcs(3), mbtowc(3), wcstombs(3), wctomb(3), locale(7)