Provided by: libfontconfig1-dev_2.13.1-2ubuntu3_amd64 

NAME
FcStrDowncase - create a lower case translation of a string
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcChar8 * FcStrDowncase (const FcChar8 *s);
DESCRIPTION
Allocates memory, copies s, converting upper case letters to lower case and returns the allocated buffer.
Fontconfig 2.13.1 06 April 2020 FcStrDowncase(3)