2.9BSD - /usr/src/lib/c/gen/abs.c

   1: /*	@(#)abs.c	2.1	SCCS id keyword	*/
   2: abs(arg)
   3: {
   4: 
   5:     if(arg < 0)
   6:         arg = -arg;
   7:     return(arg);
   8: }

Defined functions