ref: 2f4c39ec2bf7a5eb84ed1a7c810a0a85b2e47cd0 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; }