ustrupr (3) - Linux Manuals
ustrupr: Replaces all letters with upper case. Allegro game programming library.
NAME
ustrupr - Replaces all letters with upper case. Allegro game programming library.SYNOPSIS
#include <allegro.h>
DESCRIPTION
This function replaces all lower case letters in `s' with upper case letters. Example:
char buffer[] = "lower case string"; allegro_message(ustrupr(buffer));