ref: 0d4b5b8a8a6e38faf3a07774f97dbf66797f8dea 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; }