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Linux 2.6 - man page for mb_len_max (linux section 3)

MB_LEN_MAX(3)						     Linux Programmer's Manual						     MB_LEN_MAX(3)

NAME
MB_LEN_MAX - maximum multibyte length of a character across all locales
SYNOPSIS
#include <limits.h>
DESCRIPTION
The MB_LEN_MAX macro is the upper bound for the number of bytes needed to represent a single wide character, across all locales.
RETURN VALUE
A constant integer greater than zero.
CONFORMING TO
C99, POSIX.1-2001.
NOTES
The entities MB_LEN_MAX and sizeof(wchar_t) are totally unrelated. In glibc, MB_LEN_MAX is typically 6 while sizeof(wchar_t) is 4.
SEE ALSO
MB_CUR_MAX(3)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 1999-07-04 MB_LEN_MAX(3)