unimsg_common.c

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    1 /*
    2  * Copyright (c) 2003-2003
    3  *      Fraunhofer Institute for Open Communication Systems (FhG Fokus).
    4  *      All rights reserved.
    5  *
    6  * Author: Hartmut Brandt <harti@freebsd.org>
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $Begemot: libunimsg/netnatm/misc/unimsg_common.c,v 1.3 2004/07/08 08:22:03 brandt Exp $
   30  */
   31 
   32 #include <netnatm/unimsg.h>
   33 
   34 /*
   35  * Make sure there is enough space in front of the data for
   36  * len bytes, and update the read pointer.
   37  */
   38 int
   39 uni_msg_prepend(struct uni_msg *msg, size_t len)
   40 {
   41         size_t need;
   42 
   43         if (uni_msg_leading(msg) >= len) {
   44                 msg->b_rptr -= len;
   45                 return (0);
   46         }
   47         need = len - uni_msg_leading(msg);
   48         if (uni_msg_ensure(msg, need))
   49                 return (-1);
   50         memcpy(msg->b_rptr + need, msg->b_rptr, uni_msg_len(msg));
   51         msg->b_rptr += need - len;
   52         msg->b_wptr += need;
   53         return (0);
   54 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/ngatm/netnatm/misc/unimsg_common.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/ngatm/netnatm/misc/unimsg_common.c