cache_ws.c

signed
WS_Reserve(struct ws *ws, unsigned bytes)
{
	unsigned b2;

	WS_Assert(ws);
	assert(ws->r == NULL);
	if (bytes == 0)
		b2 = ws->e - ws->f;
	else if (bytes > ws->e - ws->f)
		b2 = ws->e - ws->f;
	else
		b2 = bytes;
	b2 = PRNDDN(b2);
	xxxassert(ws->f + b2 <= ws->e);
	ws->r = ws->f + b2;
	DSL(DBG_WORKSPACE, 0, "WS_Reserve(%p, %u/%u) = %u",
	    ws, b2, bytes, pdiff(ws->f, ws->r));
	WS_Assert(ws);
	return (pdiff(ws->f, ws->r));
}