Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/src/lib/djb-ape/byte/byte_zero.c
#include "byte.h" void byte_zero(register void* S,register unsigned int n) { register char* s=S; for (;;) { if (!n) break; *s++ = 0; --n; if (!n) break; *s++ = 0; --n; if (!n) break; *s++ = 0; --n; if (!n) break; *s++ = 0; --n; } }