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/*
* Buffering to output and input.
* Copyright (C) 1998 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _ZEBRA_BUFFER_H
#define _ZEBRA_BUFFER_H
/* Buffer master. */
struct buffer
{
/* Data list. */
struct buffer_data *head;
struct buffer_data *tail;
/* XXX: These unsigned longs should be size_t's */
/* Current allocated data. */
unsigned long alloc;
/* Size of each buffer_data chunk. */
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_data *next;
struct buffer_data *prev;
/* Current pointer. */
unsigned long cp;
/* Start pointer. */
unsigned long sp;
/* Actual data stream (variable length). */
unsigned char data[0]; /* real dimension is buffer->size */
};
/* Buffer prototypes. */
struct buffer *buffer_new (size_t);
int buffer_write (struct buffer *, const void *, size_t);
void buffer_free (struct buffer *);
/* Combine all accumulated (and unflushed) data inside the buffer into a
single NUL-terminated string allocated using XMALLOC(MTYPE_TMP). Note
that this function does not alter the state of the buffer, so the data
is still inside waiting to be flushed. */
char *buffer_getstr (struct buffer *);
int buffer_putc (struct buffer *, u_char);
int buffer_putstr (struct buffer *, const char *);
void buffer_reset (struct buffer *);
int buffer_flush_all (struct buffer *, int);
int buffer_flush_vty_all (struct buffer *, int, int, int);
int buffer_flush_window (struct buffer *, int, int, int, int, int);
int buffer_empty (struct buffer *);
/* buffer_flush_available attempts to flush the queued data to the given
file descriptor. It returns 0 if the buffers are now empty (after
flushing), or 1 if more data remains on the buffer queue (must be flushed
later). This function (unlike the other buffer_flush* functions) is
designed to work with non-blocking file descriptors. */
int buffer_flush_available(struct buffer *, int fd);
#endif /* _ZEBRA_BUFFER_H */
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