ref: bfbc5ab1970bbf9307e03a42e69b0d55eb92f2ef dir: /sys/src/libc/port/abs.c/
#include <u.h> #include <libc.h> int abs(int a) { if(a < 0) return -a; return a; } long labs(long a) { if(a < 0) return -a; return a; }