cl_buf.h

来自「igmp for switch in vxworks」· C头文件 代码 · 共 96 行

/***********************************************************

                          cl_buf.h  -  description
                             -------------------
description      : Buffer 
begin          : Wed April 25 2001
copyright       : (C) 2001 Dragon Co.
email          : [e-mail]


*************************************************************/



#ifndef _CL_BUF_H_
#define _CL_BUF_H_

#ifdef _cplusplus
extern"C"{
#endif



/* Buffer master. */
struct buffer
{
  /* Type of this buffer. */
  int type;

  /* Data list. */
  struct buffer_data *head;
  struct buffer_data *tail;

  /* Current allocated data. */
  unsigned long alloc;

  /* Total length of buffer. */
  unsigned long size;

  /* For allocation. */
  struct buffer_data *unused_head;
  struct buffer_data *unused_tail;

  /* Current total length of this buffer. */
  unsigned long length;
};

/* Data container. */
struct buffer_data
{
  struct buffer *parent;
  struct buffer_data *next;
  struct buffer_data *prev;

  /* Acctual data stream. */
  unsigned char *data;

  /* Current pointer. */
  unsigned long cp;

  /* Start pointer. */
  unsigned long sp;
};

/* Buffer type index. */
#define BUFFER_STRING      0
#define BUFFER_STREAM      1
#define BUFFER_VTY         2

#define PUTC(val, pnt) (*(u_char *)(pnt)++) = (u_char)(val)

#define PUTW(val, pnt) do {   u_int16_t t = htons((u_int16_t)(val));   memcpy ((pnt), &t, 2);    (pnt) += 2; } while (0)

#define PUTL(val, pnt) do {  u_int32_t t = htonl((u_int32_t)(val));   memcpy ((pnt), &t, 4);    (pnt) += 4; } while (0)

/* Buffer prototypes. */
struct buffer *buffer_new ( size_t);
int buffer_write (struct buffer *, u_char *, size_t);
void buffer_free (struct buffer *);
char *buffer_getstr (struct buffer *);
int buffer_putc (struct buffer *, u_char);
int buffer_putstr (struct buffer *, u_char *);
void buffer_reset (struct buffer *);
int buffer_flush_all (struct buffer *, int);
int buffer_flush_window (struct buffer *, int, int, int, int, int);
int buffer_empty (struct buffer *);


#ifdef _cplusplus
}
#endif

#endif /* _CL_BUF_H_ */