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freebsd/usr.sbin/ppp/mbuf.h
Brian Somers 3377c28cd9 Deal with the fact that as we now mbuf_Read the fsm
header in fsm_Input() we often end up with a NULL mbuf.

Deal with a possible NULL mbuf being passed into
mbuf_Prepend().

Adjust some spacing to make things more consistent.
1999-05-09 20:02:29 +00:00

73 lines
2.4 KiB
C

/*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: mbuf.h,v 1.16 1999/05/08 11:07:09 brian Exp $
*
* TODO:
*/
struct mbuf {
short size; /* size allocated (excluding header) */
short offset; /* offset from header end to start position */
short cnt; /* available byte count in buffer */
short type; /* MB_* below */
struct mbuf *next; /* link to next mbuf */
struct mbuf *pnext; /* link to next packet */
/* buffer space is malloc()d directly after the header */
};
struct mqueue {
struct mbuf *top;
struct mbuf *last;
int qlen;
};
#define MBUF_CTOP(bp) \
((bp) ? (u_char *)((bp)+1) + (bp)->offset : NULL)
#define CONST_MBUF_CTOP(bp) \
((bp) ? (const u_char *)((bp)+1) + (bp)->offset : NULL)
#define MB_ASYNC 1
#define MB_FSM 2
#define MB_CBCP 3
#define MB_HDLCOUT 4
#define MB_IPIN 5
#define MB_ECHO 6
#define MB_LQR 7
#define MB_VJCOMP 8
#define MB_IPQ 9
#define MB_MP 10
#define MB_MAX MB_MP
struct cmdargs;
extern int mbuf_Length(struct mbuf *);
extern struct mbuf *mbuf_Alloc(int, int);
extern struct mbuf *mbuf_FreeSeg(struct mbuf *);
extern void mbuf_Free(struct mbuf *);
extern void mbuf_Write(struct mbuf *, const void *, size_t);
extern struct mbuf *mbuf_Read(struct mbuf *, void *, size_t);
extern size_t mbuf_View(struct mbuf *, void *, size_t);
extern struct mbuf *mbuf_Prepend(struct mbuf *, const void *, size_t, size_t);
extern struct mbuf *mbuf_Truncate(struct mbuf *, size_t);
extern void mbuf_Log(void);
extern int mbuf_Show(struct cmdargs const *);
extern void mbuf_Enqueue(struct mqueue *, struct mbuf *);
extern struct mbuf *mbuf_Dequeue(struct mqueue *);
extern struct mbuf *mbuf_Contiguous(struct mbuf *);