S_SIZEMAX
testfmt(S_SIZEMAX, "%tu", (size_t)-1);
testfmt(S_SIZEMAX, "%zu", (ssize_t)-1);
#define V_SIZEMAX(x) ((x) << S_SIZEMAX)
#define G_SIZEMAX(x) (((x) >> S_SIZEMAX) & M_SIZEMAX)