man FcStrDowncase (Fonctions bibliothèques) - create a lower case translation of a string
NAME
FcStrDowncase - create a lower case translation of a string
SYNOPSIS
#include <fontconfig.h> FcChar8 * FcStrDowncase (const FcChar8 *s);
DESCRIPTION
Allocates memory, copies s, converting upper case letters to lower case and returns the allocated buffer.
VERSION
Fontconfig version 2.3.2