MAX_MARGV
for (cp = cmdline; *cp && (size_t)(cp - cmdline) < s && n < MAX_MARGV; n++) {
char *margv[MAX_MARGV];
for (cp = cmdline; argp < &margv[MAX_MARGV - 1] && *cp;) {
if (margc == MAX_MARGV - 1)
char *margv[MAX_MARGV];