From 486bcf0119d06242f624d47aef74d6d29c828f94 Mon Sep 17 00:00:00 2001
From: Soeren Apel <soeren@apelpie.net>
Date: Thu, 14 Mar 2019 12:24:04 +0100
Subject: [PATCH] DecoderSelector: Rework GSList usage to remove unnecessary
 list copying

---
 pv/subwindows/decoder_selector/model.cpp     |  8 ++-----
 pv/subwindows/decoder_selector/subwindow.cpp | 22 ++++++--------------
 2 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/pv/subwindows/decoder_selector/model.cpp b/pv/subwindows/decoder_selector/model.cpp
index 07faee8e..31dfd464 100644
--- a/pv/subwindows/decoder_selector/model.cpp
+++ b/pv/subwindows/decoder_selector/model.cpp
@@ -51,8 +51,7 @@ DecoderCollectionModel::DecoderCollectionModel(QObject* parent) :
 		make_shared<DecoderCollectionItem>(item_data, root_);
 	root_->appendSubItem(group_item_all);
 
-	GSList* l = g_slist_copy((GSList*)srd_decoder_list());
-	for (GSList* li = l; li; li = li->next) {
+	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
 		const srd_decoder *const d = (srd_decoder*)li->data;
 		assert(d);
 
@@ -70,8 +69,7 @@ DecoderCollectionModel::DecoderCollectionModel(QObject* parent) :
 		group_item_all->appendSubItem(decoder_item_all);
 
 		// Add decoder to all relevant groups using the tag information
-		GSList* t = g_slist_copy((GSList*)d->tags);
-		for (GSList* ti = t; ti; ti = ti->next) {
+		for (GSList* ti = (GSList*)d->tags; ti; ti = ti->next) {
 			const QString tag = tr((char*)ti->data);
 			const QVariant tag_var = QVariant(tag);
 
@@ -101,9 +99,7 @@ DecoderCollectionModel::DecoderCollectionModel(QObject* parent) :
 			// Add decoder to tag group
 			group_item->appendSubItem(decoder_item);
 		}
-		g_slist_free(t);
 	}
-	g_slist_free(l);
 }
 
 QVariant DecoderCollectionModel::data(const QModelIndex& index, int role) const
diff --git a/pv/subwindows/decoder_selector/subwindow.cpp b/pv/subwindows/decoder_selector/subwindow.cpp
index 719d2efa..e6245ab4 100644
--- a/pv/subwindows/decoder_selector/subwindow.cpp
+++ b/pv/subwindows/decoder_selector/subwindow.cpp
@@ -141,15 +141,13 @@ const srd_decoder* SubWindow::get_srd_decoder_from_id(QString id) const
 {
 	const srd_decoder* ret_val = nullptr;
 
-	GSList* l = g_slist_copy((GSList*)srd_decoder_list());
-	for (GSList* li = l; li; li = li->next) {
+	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
 		const srd_decoder* d = (srd_decoder*)li->data;
 		assert(d);
 
 		if (QString::fromUtf8(d->id) == id)
 			ret_val = d;
 	}
-	g_slist_free(l);
 
 	return ret_val;
 }
@@ -158,12 +156,8 @@ vector<const char*> SubWindow::decoder_inputs(const srd_decoder* d) const
 {
 	vector<const char*> ret_val;
 
-	GSList* l = g_slist_copy(d->inputs);
-	for (GSList* li = l; li; li = li->next) {
-		const char* input = (const char*)li->data;
-		ret_val.push_back(input);
-	}
-	g_slist_free(l);
+	for (GSList* li = d->inputs; li; li = li->next)
+		ret_val.push_back((const char*)li->data);
 
 	return ret_val;
 }
@@ -172,8 +166,7 @@ vector<const srd_decoder*> SubWindow::decoders_providing(const char* output) con
 {
 	vector<const srd_decoder*> ret_val;
 
-	GSList* l = g_slist_copy((GSList*)srd_decoder_list());
-	for (GSList* li = l; li; li = li->next) {
+	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
 		const srd_decoder* d = (srd_decoder*)li->data;
 		assert(d);
 
@@ -184,7 +177,6 @@ vector<const srd_decoder*> SubWindow::decoders_providing(const char* output) con
 		if (strncmp((char*)(d->outputs->data), output, strlen(output)) == 0)
 			ret_val.push_back(d);
 	}
-	g_slist_free(l);
 
 	return ret_val;
 }
@@ -208,14 +200,12 @@ void SubWindow::on_item_changed(const QModelIndex& index)
 	const QString doc = QString::fromUtf8(srd_decoder_doc_get(d));
 
 	QString tags;
-	GSList* l = g_slist_copy((GSList*)d->tags);
-	for (GSList* li = l; li; li = li->next) {
-		QString s = (li == l) ?
+	for (GSList* li = (GSList*)d->tags; li; li = li->next) {
+		QString s = (li == (GSList*)d->tags) ?
 			tr((char*)li->data) :
 			QString(tr(", %1")).arg(tr((char*)li->data));
 		tags.append(s);
 	}
-	g_slist_free(l);
 
 	info_label_header_->setText(QString("<span style='font-size:large;font-weight:bold'>%1 (%2)</span><br>%3")
 		.arg(longname, id, desc));
-- 
2.30.2