ref: 478e7e8b4ded417e4d9da86fe56fd5d6b83aa0ff dir: /sys/src/ape/lib/ap/gen/abs.c/
#include <stdlib.h> int abs(int a) { if(a < 0) return -a; return a; } long labs(long a) { if(a < 0) return -a; return a; }