MBLEN(3C)MBLEN(3C)NAMEmblen - get number of bytes in a character
SYNOPSIS
#include <stdlib.h>
int mblen(const char *s, size_t n);
DESCRIPTION
If s is not a null pointer, mblen() determines the number of bytes con‐
stituting the character pointed to by s. It is equivalent to:
mbtowc((wchar_t *)0, s, n);
A call with s as a null pointer causes this function to return 0. The
behavior of this function is affected by the LC_CTYPE category of the
current locale.
RETURN VALUES
If s is a null pointer, mblen() returns 0. It s is not a null pointer,
mblen() returns 0 (if s points to the null byte), the number of bytes
that constitute the character (if the next n or fewer bytes form a
valid character), or −1 (if they do not form a valid character) and
may set errno to indicate the error. In no case will the value returned
be greater than n or the value of the MB_CUR_MAX macro.
ERRORS
The mblen() function may fail if:
EILSEQ
Invalid character sequence is detected.
USAGE
The mblen() function can be used safely in multithreaded applications,
as long as setlocale(3C) is not being called to change the locale.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────────────┤
│CSI │ Enabled │
├────────────────────┼─────────────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────────────┤
│MT-Level │ MT-Safe with exceptions │
└────────────────────┴─────────────────────────┘
SEE ALSOmbstowcs(3C), mbtowc(3C), setlocale(3C), wcstombs(3C), wctomb(3C),
attributes(5), standards(5)
Jul 24, 2002 MBLEN(3C)
