ref: 4d22dbb0f5a0cd4d3202a01a8cc18b632b5c9b01 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; }