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/* Flexible iovec -- header
* Copyright (C) 2010 Chris Hall (GMCH), Highwayman
*
* 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_QIOVEC_H
#define _ZEBRA_QIOVEC_H
#include "zebra.h"
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#ifndef Inline
#define Inline static inline
#endif
/*==============================================================================
* Flexible size "struct iovec"
*
* NB: a completely zero structure is a valid, empty qiovec.
*/
typedef struct qiovec* qiovec ;
typedef struct qiovec qiovec_t ;
struct qiovec
{
struct iovec* vec ; /* the actual iovec array */
bool writing ; /* started, but not finished */
unsigned i_get ; /* next entry to get */
unsigned i_put ; /* next entry to put */
unsigned i_alloc ; /* number of entries allocated */
} ;
/*==============================================================================
* Functions
*/
extern qiovec qiovec_init_new(qiovec qiov) ;
extern qiovec qiovec_reset(qiovec qiov, bool free_structure) ;
#define qiovec_reset_keep(qiov) qiovec_reset(qiov, 0)
#define qiovec_reset_free(qiov) qiovec_reset(qiov, 1)
Inline bool qiovec_empty(qiovec qiov) ;
extern void qiovec_clear(qiovec qiov) ;
extern void qiovec_push(qiovec qiov, const void* base, size_t len) ;
extern int qiovec_write_nb(int fd, qiovec qiov) ;
extern int iovec_write_nb(int fd, struct iovec* p_iov, int n) ;
Inline void iovec_set(struct iovec* p_iov, const void* base, size_t len) ;
/*------------------------------------------------------------------------------
* Is given qiov empty ?
*
* NB: arranges to never add zero length entries to the iovec vector, so
* is empty when there are no active entries.
*/
Inline bool
qiovec_empty(qiovec qiov)
{
return (qiov->i_get == qiov->i_put) ;
} ;
/*------------------------------------------------------------------------------
* Set a given struct iovec
*
* Gets around the fact that the standard structure does not have a const
* pointer !
*/
#include "miyagi.h"
Inline void
iovec_set(struct iovec* p_iov, const void* base, size_t len)
{
p_iov->iov_base = miyagi(base) ;
p_iov->iov_len = len ;
} ;
#endif /* _ZEBRA_QIOVEC_H */
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