PUFFS_MSGSTRUCT_MAX
#define PUFFS_TOMOVE(a,b) (MIN((a), b->pmp_msg_maxsize - PUFFS_MSGSTRUCT_MAX))
else if (args->pa_maxmsglen < 2*PUFFS_MSGSTRUCT_MAX)
args->pa_maxmsglen = 2*PUFFS_MSGSTRUCT_MAX;
if (bp->b_bcount > pmp->pmp_msg_maxsize - PUFFS_MSGSTRUCT_MAX)