Implemented network transmit buffer. If all data couldn't be sent

immediately, it's sent after a small timeout. This cleans up some code
with IRC command sending.


git-svn-id: http://svn.irssi.org/repos/irssi/trunk@478 dbcabf3a-b0e7-0310-adc4-f8d773084564

src/core/net-sendbuffer.c

@@ -0,0 +1,165 @@
+/*
+ net-sendbuffer.c : Buffered send()
+
+    Copyright (C) 1998-2000 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 "network.h"
+#include "net-sendbuffer.h"
+
+struct _NET_SENDBUF_REC {
+	int handle;
+
+	int bufsize;
+	int bufpos;
+	char *buffer; /* Buffer is NULL until it's actually needed. */
+};
+
+static GSList *buffers;
+static int timeout_tag;
+
+/* Create new buffer - if `bufsize' is zero or less, DEFAULT_BUFFER_SIZE
+   is used */
+NET_SENDBUF_REC *net_sendbuffer_create(int handle, int bufsize)
+{
+	NET_SENDBUF_REC *rec;
+
+	rec = g_new0(NET_SENDBUF_REC, 1);
+	rec->handle = handle;
+	rec->bufsize = bufsize > 0 ? bufsize : DEFAULT_BUFFER_SIZE;
+
+	buffers = g_slist_append(buffers, rec);
+	return rec;
+}
+
+/* Destroy the buffer. `close' specifies if socket handle should be closed. */
+void net_sendbuffer_destroy(NET_SENDBUF_REC *rec, int close)
+{
+	buffers = g_slist_remove(buffers, rec);
+
+	if (close) net_disconnect(rec->handle);
+	g_free_not_null(rec->buffer);
+	g_free(rec);
+}
+
+/* Transmit all data from buffer - return TRUE if successful */
+static int buffer_send(NET_SENDBUF_REC *rec)
+{
+	int ret;
+
+	ret = net_transmit(rec->handle, rec->buffer, rec->bufpos);
+	if (ret < 0 || rec->bufpos == ret) {
+		/* error/all sent - don't try to send it anymore */
+                g_free_and_null(rec->buffer);
+		return TRUE;
+	}
+
+	if (ret > 0) {
+                rec->bufpos -= ret;
+		memmove(rec->buffer, rec->buffer+ret, rec->bufpos);
+	}
+	return FALSE;
+}
+
+static int sig_sendbuffer(void)
+{
+	GSList *tmp;
+	int stop;
+
+	stop = TRUE;
+	for (tmp = buffers; tmp != NULL; tmp = tmp->next) {
+		NET_SENDBUF_REC *rec = tmp->data;
+
+		if (rec->buffer != NULL) {
+			if (!buffer_send(rec))
+				stop = FALSE;
+		}
+	}
+
+        if (stop) timeout_tag = -1;
+	return !stop;
+}
+
+/* Add `data' to transmit buffer - return FALSE if buffer is full */
+static int buffer_add(NET_SENDBUF_REC *rec, void *data, int size)
+{
+	if (rec->buffer == NULL) {
+		rec->buffer = g_malloc(rec->bufsize);
+		rec->bufpos = 0;
+	}
+
+	if (rec->bufpos+size > rec->bufsize)
+		return FALSE;
+
+	memcpy(rec->buffer+rec->bufpos, data, size);
+	rec->bufpos += size;
+	return TRUE;
+}
+
+/* Send data, if all of it couldn't be sent immediately, it will be resent
+   automatically after a while. Returns -1 if some unrecoverable error
+   occured. */
+int net_sendbuffer_send(NET_SENDBUF_REC *rec, void *data, int size)
+{
+	int ret;
+
+	g_return_val_if_fail(rec != NULL, -1);
+	g_return_val_if_fail(data != NULL, -1);
+	if (size <= 0) return 0;
+
+	if (rec->buffer == NULL) {
+                /* nothing in buffer - transmit immediately */
+		ret = net_transmit(rec->handle, data, size);
+		if (ret < 0) return -1;
+		size -= ret;
+		data = ((char *) data) + ret;
+	}
+
+	if (size > 0) {
+		/* everything couldn't be sent. */
+		if (timeout_tag == -1) {
+			timeout_tag = g_timeout_add(100, (GSourceFunc)
+						    sig_sendbuffer, NULL);
+		}
+
+		if (!buffer_add(rec, data, size))
+			return -1;
+	}
+
+	return 0;
+}
+
+/* Returns the socket handle */
+int net_sendbuffer_handle(NET_SENDBUF_REC *rec)
+{
+	g_return_val_if_fail(rec != NULL, -1);
+
+	return rec->handle;
+}
+
+void net_sendbuffer_init(void)
+{
+	timeout_tag = -1;
+	buffers = NULL;
+}
+
+void net_sendbuffer_deinit(void)
+{
+	if (timeout_tag != -1) g_source_remove(timeout_tag);
+}