ref: 5ea63c61e0b4fba7d09edd5e471a7e7cd8e3da74 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; }