Manpage of MBLEN
MBLENSection: Linux Programmer's Manual (3)
NAMEmblen - determine number of bytes in multibyte character
#include <stdlib.h>int mblen(const char *s, size_t n);
DESCRIPTIONIf sis not NULL, the mblen() function inspects at most nbytes of the multibyte string starting at sand extracts the 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 nbytes starting at sdo not contain a complete multibyte character, mblen() returns -1. This can happen even if nis greater than or equal to MB_CUR_MAX, if the multibyte string contains redundant shift sequences.
If the multibyte string starting at scontains an invalid multibyte sequence before thecomplete character, mblen() also returns -1.
If sis 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.
RETURN VALUEThe 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.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|mblen()||Thread safety||MT-Unsafe race|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008, C99.
NOTESThe behavior of mblen() depends on the LC_CTYPEcategory of the current locale.
The function mbrlen(3) provides a better interface to the same functionality.
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