Provided by: libfontconfig-doc_2.15.0-2.3ubuntu1_all 

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 2.15.0 04 July 2025 FcStrDowncase(3)