man ustrlwr (3): Replaces all letters with lower case. Allegro game programming library.

ustrlwr(3) Replaces all letters with lower case. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

char *ustrlwr(char *s);

This function replaces all upper case letters in `s' with lower case letters. Example:

   char buffer[] = "UPPER CASE STRING";
   allegro_message(ustrlwr(buffer));

The return value is the value of `s'.