[PATCH 18/20] trace-cmd list: Show supported compression algorithms

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Add new parameter "trace-cmd list -c" to show supported compression
algorithms.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 Documentation/trace-cmd/trace-cmd-list.1.txt |  3 +++
 tracecmd/trace-list.c                        | 26 ++++++++++++++++++++
 tracecmd/trace-usage.c                       |  1 +
 3 files changed, 30 insertions(+)

diff --git a/Documentation/trace-cmd/trace-cmd-list.1.txt b/Documentation/trace-cmd/trace-cmd-list.1.txt
index a5c6b16c..b77e3460 100644
--- a/Documentation/trace-cmd/trace-cmd-list.1.txt
+++ b/Documentation/trace-cmd/trace-cmd-list.1.txt
@@ -71,6 +71,9 @@ OPTIONS
     List defined clocks that can be used with trace-cmd record -C.
     The one in brackets ([]) is the active clock.
 
+*-c*::
+    List the available trace file compression algorithms.
+
 SEE ALSO
 --------
 trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
diff --git a/tracecmd/trace-list.c b/tracecmd/trace-list.c
index d060c810..900da73b 100644
--- a/tracecmd/trace-list.c
+++ b/tracecmd/trace-list.c
@@ -549,6 +549,24 @@ static void show_plugins(void)
 	tep_free(pevent);
 }
 
+static void show_compression(void)
+{
+	char **versions, **names;
+	int c, i;
+
+	c = tracecmd_compress_protos_get(&names, &versions);
+	if (c <= 0) {
+		printf("No compression algorithms are supported\n");
+		return;
+	}
+	printf("Supported compression algorithms:\n");
+	for (i = 0; i < c; i++)
+		printf("\t%s, %s\n", names[i], versions[i]);
+
+	free(names);
+	free(versions);
+}
+
 void trace_list(int argc, char **argv)
 {
 	int events = 0;
@@ -562,6 +580,7 @@ void trace_list(int argc, char **argv)
 	int flags = 0;
 	int systems = 0;
 	int show_all = 1;
+	int compression = 0;
 	int i;
 	const char *arg;
 	const char *funcre = NULL;
@@ -626,6 +645,10 @@ void trace_list(int argc, char **argv)
 				systems = 1;
 				show_all = 0;
 				break;
+			case 'c':
+				compression = 1;
+				show_all = 0;
+				break;
 			case '-':
 				if (strcmp(argv[i], "--debug") == 0) {
 					tracecmd_set_debug(true);
@@ -670,6 +693,8 @@ void trace_list(int argc, char **argv)
 		show_clocks();
 	if (systems)
 		show_systems();
+	if (compression)
+		show_compression();
 	if (show_all) {
 		printf("event systems:\n");
 		show_systems();
@@ -679,6 +704,7 @@ void trace_list(int argc, char **argv)
 		show_tracers();
 		printf("\noptions:\n");
 		show_options();
+		show_compression();
 	}
 
 	return;
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index ac12b066..34c6cc35 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -348,6 +348,7 @@ static struct usage_help usage_help[] = {
 		"          -O list plugin options\n"
 		"          -B list defined buffer instances\n"
 		"          -C list the defined clocks (and active one)\n"
+		"          -c list the supported trace file compression algorithms\n"
 	},
 	{
 		"restore",
-- 
2.31.1