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/*
* Copyright (c) 2006, 2008 Alexey Vatchenko <av@bsdua.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* VPool: implementation of pool of data with a variable size.
*/
#ifndef _VPOOL_H_
#define _VPOOL_H_
#include <sys/types.h>
#include <limits.h>
struct vpool {
void *v_basebuf; /* pointer returned by (re|m)alloc() */
void *v_buf; /* actual data starts here */
size_t v_off;
size_t v_size;
size_t v_blksize;
size_t v_limit;
int v_lasterr;
};
enum vpool_trunc {VPOOL_EXCLUDE, VPOOL_INCLUDE};
#define VPOOL_TAIL UINT_MAX
void vpool_init(struct vpool *pool, size_t blksize, size_t limit);
void vpool_final(struct vpool *pool);
void vpool_reset(struct vpool *pool);
void vpool_wipe(struct vpool *pool);
void * vpool_insert(struct vpool *pool,
size_t where, void *data, size_t datsize);
void * vpool_expand(struct vpool *pool, size_t where, size_t size);
int vpool_truncate(struct vpool *pool,
size_t where, size_t size, enum vpool_trunc how);
#define vpool_is_empty(pool) ((pool)->v_off == 0)
#define vpool_get_buf(pool) ((pool)->v_buf)
#define vpool_get_length(pool) ((pool)->v_off)
#define vpool_get_error(pool) ((pool)->v_lasterr)
void vpool_export(struct vpool *pool, void **buf, size_t *size);
#endif /* !_VPOOL_H_ */
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