ref: c02de4e9e2b13f0b951ba05c2c9b9f6d1c2a2673 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; }