CHECKSTRSPACE
CHECKSTRSPACE(SPACE_NEEDED, expdest); /* nb: stack block might move */
CHECKSTRSPACE(nnl + 2, dest);
CHECKSTRSPACE(16, p);
CHECKSTRSPACE(12, out);
CHECKSTRSPACE(6, out); /* permit 6 calls to USTPUTC */
CHECKSTRSPACE((*v1)->name_len + 1, p);
CHECKSTRSPACE((*v2)->name_len + 1, p);