trunk/src/dbuf.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2016 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);

  /* As per C99, (v)snprintf returns the length the resulting string would be */
  if (dbuf->size > sizeof(dbuf->data))
    dbuf->size = sizeof(dbuf->data);
}

void
dbuf_put(struct dbuf_queue *queue, const char *buf, size_t sz)
{
  while (sz > 0)
  {
    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);
    }

    size_t 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:	7797
Committed:	Tue Oct 18 17:27:10 2016 UTC (8 years, 10 months ago) by michael
Content type:	text/x-csrc
File size:	3324 byte(s)
Log Message:	- Minor style corrections and constifications
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2016 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
34	static mp_pool_t *dbuf_pool;
35
36	void
37	dbuf_init(void)
38	{
39	dbuf_pool = mp_pool_new(sizeof(struct dbuf_block), MP_CHUNK_SIZE_DBUF);
40	}
41
42	struct dbuf_block *
43	dbuf_alloc(void)
44	{
45	struct dbuf_block *block = mp_pool_get(dbuf_pool);
46
47	++block->refs;
48	return block;
49	}
50
51	void
52	dbuf_ref_free(struct dbuf_block *block)
53	{
54	if (--block->refs <= 0)
55	mp_pool_release(block);
56	}
57
58	void
59	dbuf_add(struct dbuf_queue queue, struct dbuf_block block)
60	{
61	block->refs++;
62	dlinkAddTail(block, make_dlink_node(), &queue->blocks);
63	queue->total_size += block->size;
64	}
65
66	void
67	dbuf_delete(struct dbuf_queue *queue, size_t count)
68	{
69	while (count > 0 && dbuf_length(queue) > 0)
70	{
71	dlink_node *node = queue->blocks.head;
72	struct dbuf_block *block = node->data;
73	size_t avail = block->size - queue->pos;
74
75	if (count >= avail)
76	{
77	count -= avail;
78	queue->total_size -= avail;
79
80	dbuf_ref_free(block);
81
82	dlinkDelete(node, &queue->blocks);
83	free_dlink_node(node);
84
85	queue->pos = 0;
86	}
87	else
88	{
89	queue->pos += count;
90
91	queue->total_size -= count;
92	count -= count;
93	}
94	}
95	}
96
97	void
98	dbuf_put_fmt(struct dbuf_block dbuf, const char pattern, ...)
99	{
100	va_list args;
101
102	assert(dbuf->refs == 1);
103
104	va_start(args, pattern);
105	dbuf_put_args(dbuf, pattern, args);
106	va_end(args);
107	}
108
109	void
110	dbuf_put_args(struct dbuf_block dbuf, const char data, va_list args)
111	{
112	assert(dbuf->refs == 1);
113
114	dbuf->size += vsnprintf(dbuf->data + dbuf->size, sizeof(dbuf->data) - dbuf->size, data, args);
115
116	/* As per C99, (v)snprintf returns the length the resulting string would be */
117	if (dbuf->size > sizeof(dbuf->data))
118	dbuf->size = sizeof(dbuf->data);
119	}
120
121	void
122	dbuf_put(struct dbuf_queue queue, const char buf, size_t sz)
123	{
124	while (sz > 0)
125	{
126	struct dbuf_block *block = dbuf_length(queue) ? queue->blocks.tail->data : NULL;
127
128	if (block == NULL \|\| sizeof(block->data) - block->size == 0)
129	{
130	block = dbuf_alloc();
131	dlinkAddTail(block, make_dlink_node(), &queue->blocks);
132	}
133
134	size_t avail = sizeof(block->data) - block->size;
135	if (avail > sz)
136	avail = sz;
137
138	memcpy(&block->data[block->size], buf, avail);
139	block->size += avail;
140
141	queue->total_size += avail;
142
143	sz -= avail;
144	buf += avail;
145	}
146	}