ref: 435a0f18d5a5f372b4d5a30953e8d6bfd9cf6d17 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; }