Man page - fcstrstr(3)
Packages contains this manual
Manual
FcStrStr
NAMESYNOPSIS
DESCRIPTION
NAME
FcStrStr - locate UTF-8 substring
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcChar8 * FcStrStr (const FcChar8 * s1 , const FcChar8 * s2 );
DESCRIPTION
Returns the location of s2 in s1 . Returns NULL if s2 is not present in s1 . This test will operate properly with UTF8 encoded strings.