ref: e61060a5fe59b10d8f68e75eb5e5380d8a1b29e4 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; }