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MB_LEN_MAX - maximum multibyte length of a character across
all locales
#include <limits.h>
#define MB_LEN_MAX constant-expression
The MB_LEN_MAX macro is
the upper bound for the number of bytes needed to represent a single wide
character, across all locales.
A constant integer >= 1.
ANSI C, POSIX.1
The entities MB_LEN_MAX and sizeof(wchar_t) are totally
unrelated. In the GNU libc, MB_LEN_MAX is typically 6 while sizeof(wchar_t)
is 4.
MB_CUR_MAX(3)
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