ref: 5d0758b3eea7b9b7b0dac1e2ec3254f11ba4e6cb 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; }