ref: 0d268b0f5e28a0b2bfafe5a510d40bbdb032aa52 dir: /sys/src/ape/lib/bsd/nptohl.c/
unsigned long nptohl(void *p) { unsigned char *up; unsigned long x; up = p; x = (up[0]<<24)|(up[1]<<16)|(up[2]<<8)|up[3]; return x; }