From: Gerhard Sittig <gerhard.sittig@gmx.net>
Date: Wed, 15 Aug 2018 21:48:52 +0000 (+0200)
Subject: Logging: obsolete -s, log to internal buffer as well as stdout
X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=commitdiff_plain;h=4b9234088f56c5b0e22f8aa5b18ef346285a7fc6

Logging: obsolete -s, log to internal buffer as well as stdout

Query the sr and srd libraries' current log routines before registering
PV's own log callback which queues messages in an internal buffer. This
allows duplication of messages to the internal buffer _and_ stdout, and
thus obsoletes the -s option.
---

diff --git a/main.cpp b/main.cpp
index 780371b..ce12573 100644
--- a/main.cpp
+++ b/main.cpp
@@ -155,7 +155,6 @@ void usage()
 		"  -i, --input-file                Load input from file\n"
 		"  -I, --input-format              Input format\n"
 		"  -c, --clean                     Don't restore previous sessions on startup\n"
-		"  -s, --log-to-stdout             Don't use logging, output to stdout instead\n"
 		"\n", PV_BIN_NAME);
 }
 
@@ -167,7 +166,6 @@ int main(int argc, char *argv[])
 	vector<string> open_files;
 	bool restore_sessions = true;
 	bool do_scan = true;
-	bool do_logging = true;
 
 	Application a(argc, argv);
 
@@ -193,7 +191,7 @@ int main(int argc, char *argv[])
 		};
 
 		const int c = getopt_long(argc, argv,
-			"h?VDcsl:d:i:I:", long_options, nullptr);
+			"h?VDcl:d:i:I:", long_options, nullptr);
 		if (c == -1)
 			break;
 
@@ -248,10 +246,6 @@ int main(int argc, char *argv[])
 		case 'c':
 			restore_sessions = false;
 			break;
-
-		case 's':
-			do_logging = false;
-			break;
 		}
 	}
 	argc -= optind;
@@ -264,8 +258,7 @@ int main(int argc, char *argv[])
 	pv::GlobalSettings settings;
 	settings.set_defaults_where_needed();
 
-	if (do_logging)
-		pv::logging.init();
+	pv::logging.init();
 
 	// Initialise libsigrok
 	context = sigrok::Context::create();
diff --git a/pv/logging.cpp b/pv/logging.cpp
index dea333e..83577af 100644
--- a/pv/logging.cpp
+++ b/pv/logging.cpp
@@ -37,12 +37,24 @@ Logging logging;
 const int Logging::MIN_BUFFER_SIZE = 10;
 const int Logging::MAX_BUFFER_SIZE = 50000;
 
+static sr_log_callback prev_sr_log_cb;
+static void *prev_sr_log_cb_data;
+
+#ifdef ENABLE_DECODE
+static srd_log_callback prev_srd_log_cb;
+static void *prev_srd_log_cb_data;
+#endif
+
 Logging::~Logging()
 {
 	qInstallMessageHandler(nullptr);
-	sr_log_callback_set_default();
+	sr_log_callback_set(prev_sr_log_cb, prev_sr_log_cb_data);
+	prev_sr_log_cb = NULL;
+	prev_sr_log_cb_data = NULL;
 #ifdef ENABLE_DECODE
-	srd_log_callback_set_default();
+	srd_log_callback_set(prev_srd_log_cb, prev_srd_log_cb_data);
+	prev_srd_log_cb = NULL;
+	prev_srd_log_cb_data = NULL;
 #endif
 
 	GlobalSettings::remove_change_handler(this);
@@ -58,8 +70,10 @@ void Logging::init()
 	buffer_.reserve(buffer_size_);
 
 	qInstallMessageHandler(log_pv);
+	sr_log_callback_get(&prev_sr_log_cb, &prev_sr_log_cb_data);
 	sr_log_callback_set(log_sr, nullptr);
 #ifdef ENABLE_DECODE
+	srd_log_callback_get(&prev_srd_log_cb, &prev_srd_log_cb_data);
 	srd_log_callback_set(log_srd, nullptr);
 #endif
 
@@ -138,8 +152,14 @@ void Logging::log_pv(QtMsgType type, const QMessageLogContext &context, const QS
 
 int Logging::log_sr(void *cb_data, int loglevel, const char *format, va_list args)
 {
+	va_list args2;
+
 	(void)cb_data;
-	(void)loglevel;
+
+	va_copy(args2, args);
+	if (prev_sr_log_cb)
+		prev_sr_log_cb(prev_sr_log_cb_data, loglevel, format, args2);
+	va_end(args2);
 
 	char *text = g_strdup_vprintf(format, args);
 	logging.log(QString::fromUtf8(text), LogSource_sr);
@@ -151,8 +171,14 @@ int Logging::log_sr(void *cb_data, int loglevel, const char *format, va_list arg
 #ifdef ENABLE_DECODE
 int Logging::log_srd(void *cb_data, int loglevel, const char *format, va_list args)
 {
+	va_list args2;
+
 	(void)cb_data;
-	(void)loglevel;
+
+	va_copy(args2, args);
+	if (prev_srd_log_cb)
+		prev_srd_log_cb(prev_srd_log_cb_data, loglevel, format, args2);
+	va_end(args2);
 
 	char *text = g_strdup_vprintf(format, args);
 	logging.log(QString::fromUtf8(text), LogSource_srd);