Provided by: libfontconfig1-dev_2.12.6-0ubuntu2_amd64 
NAME
FcUtf8Len - count UTF-8 encoded chars
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcBool FcUtf8Len (FcChar8 *src, int len, int *nchar, int *wchar);
DESCRIPTION
Counts the number of Unicode chars in len bytes of src. Places that count in nchar. wchar contains 1, 2
or 4 depending on the number of bytes needed to hold the largest Unicode char counted. The return value
indicates whether src is a well-formed UTF8 string.