#ifndef lint static char rcs_id[] = "$Header: xdr_mbuf.c,v 1.1 86/09/08 13:07:58 tadl Exp $"; #endif /* * RCS info * $Locker: tadl $ */ /* NFSSRC @(#)xdr_mbuf.c 2.1 86/04/14 */ #ifndef lint static char sccsid[] = "@(#)xdr_mbuf.c 1.1 86/02/03 Copyr 1984 Sun Micro"; #endif /* * xdr_mbuf.c, XDR implementation on kernel mbufs. * * * * Copyright (C) 1984, Sun Microsystems, Inc. */ #include "../h/param.h" #include "../h/mbuf.h" #include "../rpc/types.h" #include "../rpc/xdr.h" #include "../netinet/in.h" #include "../h/uio.h" bool_t xdrmbuf_getlong(), xdrmbuf_putlong(); bool_t xdrmbuf_getbytes(), xdrmbuf_putbytes(); u_int xdrmbuf_getpos(); bool_t xdrmbuf_setpos(); long * xdrmbuf_inline(); void xdrmbuf_destroy(); /* * Xdr on mbufs operations vector. */ struct xdr_ops xdrmbuf_ops = { xdrmbuf_getlong, xdrmbuf_putlong, xdrmbuf_getbytes, xdrmbuf_putbytes, xdrmbuf_getpos, xdrmbuf_setpos, xdrmbuf_inline, xdrmbuf_destroy }; /* * Initailize xdr stream. */ void xdrmbuf_init(xdrs, m, op) register XDR *xdrs; register struct mbuf *m; enum xdr_op op; { xdrs->x_op = op; xdrs->x_ops = &xdrmbuf_ops; xdrs->x_base = (caddr_t)m; xdrs->x_private = mtod(m, caddr_t); xdrs->x_public = (caddr_t)0; xdrs->x_handy = m->m_len; } void /* ARGSUSED */ xdrmbuf_destroy(xdrs) XDR *xdrs; { /* do nothing */ } bool_t xdrmbuf_getlong(xdrs, lp) register XDR *xdrs; long *lp; { if ((xdrs->x_handy -= sizeof(long)) < 0) { if (xdrs->x_handy != -sizeof(long)) printf("xdr_mbuf: long crosses mbufs!\n"); if (xdrs->x_base) { register struct mbuf *m = ((struct mbuf *)xdrs->x_base)->m_next; xdrs->x_base = (caddr_t)m; if (m == NULL) return (FALSE); xdrs->x_private = mtod(m, caddr_t); xdrs->x_handy = m->m_len - sizeof(long); } else { return (FALSE); } } *lp = ntohl(*((long *)(xdrs->x_private))); xdrs->x_private += sizeof(long); return (TRUE); } bool_t xdrmbuf_putlong(xdrs, lp) register XDR *xdrs; long *lp; { if ((xdrs->x_handy -= sizeof(long)) < 0) { if (xdrs->x_handy != -sizeof(long)) printf("xdr_mbuf: putlong, long crosses mbufs!\n"); if (xdrs->x_base) { register struct mbuf *m = ((struct mbuf *)xdrs->x_base)->m_next; xdrs->x_base = (caddr_t)m; if (m == NULL) return (FALSE); xdrs->x_private = mtod(m, caddr_t); xdrs->x_handy = m->m_len - sizeof(long); } else { return (FALSE); } } *(long *)xdrs->x_private = htonl(*lp); xdrs->x_private += sizeof(long); return (TRUE); } bool_t xdrmbuf_getbytes(xdrs, addr, len) register XDR *xdrs; caddr_t addr; register u_int len; { while ((xdrs->x_handy -= len) < 0) { if ((xdrs->x_handy += len) > 0) { bcopy(xdrs->x_private, addr, (u_int)xdrs->x_handy); addr += xdrs->x_handy; len -= xdrs->x_handy; } if (xdrs->x_base) { register struct mbuf *m = ((struct mbuf *)xdrs->x_base)->m_next; xdrs->x_base = (caddr_t)m; if (m == NULL) return (FALSE); xdrs->x_private = mtod(m, caddr_t); xdrs->x_handy = m->m_len; } else { return (FALSE); } } bcopy(xdrs->x_private, addr, (u_int)len); xdrs->x_private += len; return (TRUE); } bool_t xdrmbuf_putbytes(xdrs, addr, len) register XDR *xdrs; caddr_t addr; register u_int len; { while ((xdrs->x_handy -= len) < 0) { if ((xdrs->x_handy += len) > 0) { bcopy(addr, xdrs->x_private, (u_int)xdrs->x_handy); addr += xdrs->x_handy; len -= xdrs->x_handy; } if (xdrs->x_base) { register struct mbuf *m = ((struct mbuf *)xdrs->x_base)->m_next; xdrs->x_base = (caddr_t)m; if (m == NULL) return (FALSE); xdrs->x_private = mtod(m, caddr_t); xdrs->x_handy = m->m_len; } else { return (FALSE); } } bcopy(addr, xdrs->x_private, len); xdrs->x_private += len; return (TRUE); } /* * Like putbytes, only we avoid the copy by pointing a type 2 * mbuf at the buffer. Not safe if the buffer goes away before * the mbuf chain is deallocated. */ bool_t xdrmbuf_putbuf(xdrs, addr, len, func, arg) register XDR *xdrs; caddr_t addr; u_int len; int (*func)(); int arg; { register struct mbuf *m; struct mbuf *mclgetx(); long llen = len; xdrmbuf_putlong(xdrs, &llen); len = (len + 3) & ~3; /* actually we could memory fault - need to put out zeros */ ((struct mbuf *)xdrs->x_base)->m_len -= xdrs->x_handy; m = mclgetx(func, arg, addr, (int)len, M_WAIT); if (m == NULL) { printf("xdrmbuf_putbuf: mclgetx failed\n"); return (FALSE); } ((struct mbuf *)xdrs->x_base)->m_next = m; xdrs->x_handy = 0; return (TRUE); } u_int xdrmbuf_getpos(xdrs) register XDR *xdrs; { return ( (u_int)xdrs->x_private - mtod(((struct mbuf *)xdrs->x_base), u_int)); } bool_t xdrmbuf_setpos(xdrs, pos) register XDR *xdrs; u_int pos; { register caddr_t newaddr = mtod(((struct mbuf *)xdrs->x_base), caddr_t) + pos; register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; if ((int)newaddr > (int)lastaddr) return (FALSE); xdrs->x_private = newaddr; xdrs->x_handy = (int)lastaddr - (int)newaddr; return (TRUE); } long * xdrmbuf_inline(xdrs, len) register XDR *xdrs; int len; { long *buf = 0; if (xdrs->x_handy >= len) { xdrs->x_handy -= len; buf = (long *) xdrs->x_private; xdrs->x_private += len; } return (buf); }