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From @(#)multibyte.3 8.1 (Berkeley) 6/4/93
From FreeBSD: src/lib/libc/locale/multibyte.3,v 1.22 2003/11/08 03:23:11 tjr Exp
$FreeBSD$
.Dd April 11, 2004 .Dt MBLEN 3 .Os .Sh NAME .Nm mblen .Nd get number of bytes in a character .Sh LIBRARY .Lb libc .Sh SYNOPSIS n stdlib.h .Ft int .Fn mblen "const char *mbchar" "size_t nbytes" .Sh DESCRIPTION The .Fn mblen function computes the length in bytes of a multibyte character .Fa mbchar according to the current conversion state. Up to .Fa nbytes bytes are examined.
p A call with a null .Fa mbchar pointer returns nonzero if the current locale requires shift states, zero otherwise; if shift states are required, the shift state is reset to the initial state. .Sh RETURN VALUES If .Fa mbchar is .Dv NULL , the .Fn mblen function returns nonzero if shift states are supported, zero otherwise.
p Otherwise, if .Fa mbchar is not a null pointer, .Fn mblen either returns 0 if .Fa mbchar represents the null wide character, or returns the number of bytes processed in .Fa mbchar , or returns -1 if no multibyte character could be recognized or converted. In this case, .Fn mblen Ns 's internal conversion state is undefined. .Sh ERRORS The .Fn mblen function will fail if: l -tag -width Er t Bq Er EILSEQ An invalid multibyte sequence was detected. t Bq Er EINVAL The internal conversion state is not valid. .El .Sh SEE ALSO .Xr mbrlen 3 , .Xr mbtowc 3 , .Xr multibyte 3 .Sh STANDARDS The .Fn mblen function conforms to .St -isoC-99 .