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/*
write-buffer.c : irssi
Copyright (C) 2001 Timo Sirainen
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "signals.h"
#include "commands.h"
#include "settings.h"
#include "write-buffer.h"
#define BUFFER_BLOCK_SIZE 2048
typedef struct {
char *active_block;
int active_block_pos;
GSList *blocks;
} BUFFER_REC;
static GSList *empty_blocks;
static GHashTable *buffers;
static int block_count;
static int write_buffer_max_blocks;
static int timeout_tag;
static void write_buffer_new_block(BUFFER_REC *rec)
{
char *block;
if (empty_blocks == NULL)
block = g_malloc(BUFFER_BLOCK_SIZE);
else {
block = empty_blocks->data;
empty_blocks = g_slist_remove(empty_blocks, block);
}
block_count++;
rec->active_block = block;
rec->active_block_pos = 0;
rec->blocks = g_slist_append(rec->blocks, block);
}
int write_buffer(int handle, const void *data, int size)
{
BUFFER_REC *rec;
const char *cdata = data;
int next_size;
if (write_buffer_max_blocks <= 0) {
/* no write buffer */
return write(handle, data, size);
}
if (size <= 0)
return size;
rec = g_hash_table_lookup(buffers, GINT_TO_POINTER(handle));
if (rec == NULL) {
rec = g_new0(BUFFER_REC, 1);
write_buffer_new_block(rec);
g_hash_table_insert(buffers, GINT_TO_POINTER(handle), rec);
}
while (size > 0) {
if (rec->active_block_pos == BUFFER_BLOCK_SIZE)
write_buffer_new_block(rec);
next_size = size < BUFFER_BLOCK_SIZE-rec->active_block_pos ?
size : BUFFER_BLOCK_SIZE-rec->active_block_pos;
memcpy(rec->active_block+rec->active_block_pos,
cdata, next_size);
rec->active_block_pos += next_size;
cdata += next_size;
size -= next_size;
}
if (block_count > write_buffer_max_blocks)
write_buffer_flush();
return size;
}
static int write_buffer_flush_rec(void *handlep, BUFFER_REC *rec)
{
GSList *tmp;
int handle, size;
handle = GPOINTER_TO_INT(handlep);
for (tmp = rec->blocks; tmp != NULL; tmp = tmp->next) {
size = tmp->data != rec->active_block ? BUFFER_BLOCK_SIZE :
rec->active_block_pos;
write(handle, tmp->data, size);
}
empty_blocks = g_slist_concat(empty_blocks, rec->blocks);
g_free(rec);
return TRUE;
}
void write_buffer_flush(void)
{
g_slist_foreach(empty_blocks, (GFunc) g_free, NULL);
g_slist_free(empty_blocks);
empty_blocks = NULL;
g_hash_table_foreach_remove(buffers,
(GHRFunc) write_buffer_flush_rec, NULL);
block_count = 0;
}
static int flush_timeout(void)
{
write_buffer_flush();
return 1;
}
static void read_settings(void)
{
int msecs;
write_buffer_flush();
write_buffer_max_blocks = settings_get_int("write_buffer_kb") *
1024/BUFFER_BLOCK_SIZE;
if (settings_get_int("write_buffer_mins") > 0) {
msecs = settings_get_int("write_buffer_mins")*60*1000;
if (timeout_tag == -1) {
timeout_tag = g_timeout_add(msecs,
(GSourceFunc) flush_timeout,
NULL);
}
} else if (timeout_tag != -1) {
g_source_remove(timeout_tag);
timeout_tag = -1;
}
}
static void cmd_flushbuffer(void)
{
write_buffer_flush();
}
void write_buffer_init(void)
{
settings_add_int("misc", "write_buffer_mins", 0);
settings_add_int("misc", "write_buffer_kb", 0);
buffers = g_hash_table_new((GHashFunc) g_direct_hash,
(GCompareFunc) g_direct_equal);
empty_blocks = NULL;
block_count = 0;
timeout_tag = -1;
read_settings();
signal_add("setup changed", (SIGNAL_FUNC) read_settings);
command_bind("flushbuffer", NULL, (SIGNAL_FUNC) cmd_flushbuffer);
}
void write_buffer_deinit(void)
{
if (timeout_tag != -1)
g_source_remove(timeout_tag);
write_buffer_flush();
g_hash_table_destroy(buffers);
g_slist_foreach(empty_blocks, (GFunc) g_free, NULL);
g_slist_free(empty_blocks);
signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
command_unbind("flushbuffer", (SIGNAL_FUNC) cmd_flushbuffer);
}
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