Provided by: libfontconfig1-dev_2.12.6-0ubuntu2_amd64 bug

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.

Fontconfig 2.12.6                                 05 April 2018                                      FcStrStr(3)