ustrupr (3) - Linux Manuals
ustrupr: Replaces all letters with upper case. Allegro game programming library.
Command to display ustrupr manual in Linux: $ man 3 ustrupr
 
NAME
ustrupr - Replaces all letters with upper case. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
char *ustrupr(char *s);
DESCRIPTION
This function replaces all lower case letters in `s' with upper case
letters. Example:
   char buffer[] = "lower case string";
   allegro_message(ustrupr(buffer));
RETURN VALUE
The return value is the value of `s'.