trunk/src/dbuf.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2014 ircd-hybrid development team
 *
 *  This program 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 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file dbuf.c
 * \brief Supports dynamic data buffers.
 * \version $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "dbuf.h"
#include "memory.h"
#include "mempool.h"

static mp_pool_t *dbuf_pool;

void
dbuf_init(void)
{
  dbuf_pool = mp_pool_new(sizeof(struct dbuf_block), MP_CHUNK_SIZE_DBUF);
}

struct dbuf_block *
dbuf_alloc(void)
{
  struct dbuf_block *block = mp_pool_get(dbuf_pool);

  ++block->refs;
  return block;
}

void
dbuf_ref_free(struct dbuf_block *block)
{
  if (--block->refs <= 0)
    mp_pool_release(block);
}

void
dbuf_add(struct dbuf_queue *queue, struct dbuf_block *block)
{
  block->refs++;
  dlinkAddTail(block, make_dlink_node(), &queue->blocks);
  queue->total_size += block->size;
}

void
dbuf_delete(struct dbuf_queue *queue, size_t count)
{
  while (count > 0 && dbuf_length(queue) > 0)
  {
    dlink_node *node = queue->blocks.head;
    struct dbuf_block *block = node->data;
    size_t avail = block->size - queue->pos;

    if (count >= avail)
    {
      count -= avail;
      queue->total_size -= avail;

      dbuf_ref_free(block);

      dlinkDelete(node, &queue->blocks);
      free_dlink_node(node);

      queue->pos = 0;
    }
    else
    {
      queue->pos += count;

      queue->total_size -= count;
      count -= count;
    }
  }
}

void
dbuf_put_fmt(struct dbuf_block *dbuf, const char *pattern, ...)
{
  va_list args;

  assert(dbuf->refs == 1);

  va_start(args, pattern);
  dbuf_put_args(dbuf, pattern, args);
  va_end(args);
}

void
dbuf_put_args(struct dbuf_block *dbuf, const char *data, va_list args)
{
  assert(dbuf->refs == 1);

  dbuf->size += vsnprintf(dbuf->data + dbuf->size, sizeof(dbuf->data) - dbuf->size, data, args);
  if (dbuf->size > sizeof(dbuf->data))
    dbuf->size = sizeof(dbuf->data); /* required by some versions of vsnprintf */
}

void
dbuf_put(struct dbuf_queue *queue, const char *buf, size_t sz)
{
  while (sz > 0)
  {
    size_t avail;
    struct dbuf_block *block = dbuf_length(queue) ? queue->blocks.tail->data : NULL;

    if (block == NULL || sizeof(block->data) - block->size == 0)
    {
      block = dbuf_alloc();
      dlinkAddTail(block, make_dlink_node(), &queue->blocks);
    }

    avail = sizeof(block->data) - block->size;
    if (avail > sz)
      avail = sz;

    memcpy(&block->data[block->size], buf, avail);
    block->size += avail;

    queue->total_size += avail;

    sz -= avail;
    buf += avail;
  }
}
Revision:	4565
Committed:	Sun Aug 24 10:27:40 2014 UTC (11 years ago) by michael
Content type:	text/x-csrc
File size:	3297 byte(s)
Log Message:	- Update GPL 2 license headers
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2014 ircd-hybrid development team
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file dbuf.c
23	* \brief Supports dynamic data buffers.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#include "list.h"
29	#include "dbuf.h"
30	#include "memory.h"
31	#include "mempool.h"
32
33	static mp_pool_t *dbuf_pool;
34
35	void
36	dbuf_init(void)
37	{
38	dbuf_pool = mp_pool_new(sizeof(struct dbuf_block), MP_CHUNK_SIZE_DBUF);
39	}
40
41	struct dbuf_block *
42	dbuf_alloc(void)
43	{
44	struct dbuf_block *block = mp_pool_get(dbuf_pool);
45
46	++block->refs;
47	return block;
48	}
49
50	void
51	dbuf_ref_free(struct dbuf_block *block)
52	{
53	if (--block->refs <= 0)
54	mp_pool_release(block);
55	}
56
57	void
58	dbuf_add(struct dbuf_queue queue, struct dbuf_block block)
59	{
60	block->refs++;
61	dlinkAddTail(block, make_dlink_node(), &queue->blocks);
62	queue->total_size += block->size;
63	}
64
65	void
66	dbuf_delete(struct dbuf_queue *queue, size_t count)
67	{
68	while (count > 0 && dbuf_length(queue) > 0)
69	{
70	dlink_node *node = queue->blocks.head;
71	struct dbuf_block *block = node->data;
72	size_t avail = block->size - queue->pos;
73
74	if (count >= avail)
75	{
76	count -= avail;
77	queue->total_size -= avail;
78
79	dbuf_ref_free(block);
80
81	dlinkDelete(node, &queue->blocks);
82	free_dlink_node(node);
83
84	queue->pos = 0;
85	}
86	else
87	{
88	queue->pos += count;
89
90	queue->total_size -= count;
91	count -= count;
92	}
93	}
94	}
95
96	void
97	dbuf_put_fmt(struct dbuf_block dbuf, const char pattern, ...)
98	{
99	va_list args;
100
101	assert(dbuf->refs == 1);
102
103	va_start(args, pattern);
104	dbuf_put_args(dbuf, pattern, args);
105	va_end(args);
106	}
107
108	void
109	dbuf_put_args(struct dbuf_block dbuf, const char data, va_list args)
110	{
111	assert(dbuf->refs == 1);
112
113	dbuf->size += vsnprintf(dbuf->data + dbuf->size, sizeof(dbuf->data) - dbuf->size, data, args);
114	if (dbuf->size > sizeof(dbuf->data))
115	dbuf->size = sizeof(dbuf->data); /* required by some versions of vsnprintf */
116	}
117
118	void
119	dbuf_put(struct dbuf_queue queue, const char buf, size_t sz)
120	{
121	while (sz > 0)
122	{
123	size_t avail;
124	struct dbuf_block *block = dbuf_length(queue) ? queue->blocks.tail->data : NULL;
125
126	if (block == NULL \|\| sizeof(block->data) - block->size == 0)
127	{
128	block = dbuf_alloc();
129	dlinkAddTail(block, make_dlink_node(), &queue->blocks);
130	}
131
132	avail = sizeof(block->data) - block->size;
133	if (avail > sz)
134	avail = sz;
135
136	memcpy(&block->data[block->size], buf, avail);
137	block->size += avail;
138
139	queue->total_size += avail;
140
141	sz -= avail;
142	buf += avail;
143	}
144	}