[PATCH v5 1/5] v4l2-compliance: Add version command

[Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>]

Add a --version option to v4l2-compliance to retrieve the version of
v4l2-compliance. While at it, factor out and reorder printing the SHA to
after argument parsing.

Signed-off-by: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>

---
Changes in v5:
- update manpage
- move STR macros to before print_sha()

Changes in v4:
- add git commit count to version

Changes in v3:
- embed PACKAGE_VERSION instead of string concatenation
---
 utils/v4l2-compliance/v4l2-compliance.1.in |  3 +++
 utils/v4l2-compliance/v4l2-compliance.cpp  | 31 +++++++++++++++++-----
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/utils/v4l2-compliance/v4l2-compliance.1.in b/utils/v4l2-compliance/v4l2-compliance.1.in
index 39f0229d..89d7e482 100644
--- a/utils/v4l2-compliance/v4l2-compliance.1.in
+++ b/utils/v4l2-compliance/v4l2-compliance.1.in
@@ -184,6 +184,9 @@ Trace all called ioctls.
 \fB\-v\fR, \fB\-\-verbose\fR
 Turn on verbose reporting.
 .TP
+\fB\-\-version\fR
+Show version information.
+.TP
 \fB\-w\fR, \fB\-\-wrapper\fR
 Use the libv4l2 wrapper library for all V4L2 device accesses. Note that doing this will
 cause some tests to fail because the libv4l2 library isn't fully V4L2 compliant. By
diff --git a/utils/v4l2-compliance/v4l2-compliance.cpp b/utils/v4l2-compliance/v4l2-compliance.cpp
index 825f2aa6..92b4e995 100644
--- a/utils/v4l2-compliance/v4l2-compliance.cpp
+++ b/utils/v4l2-compliance/v4l2-compliance.cpp
@@ -76,6 +76,7 @@ enum Option {
 	OptMediaBusInfo = 'z',
 	OptStreamFrom = 128,
 	OptStreamFromHdr,
+	OptVersion,
 	OptLast = 256
 };
 
@@ -150,9 +151,25 @@ static struct option long_options[] = {
 	{"stream-all-formats", optional_argument, 0, OptStreamAllFormats},
 	{"stream-all-io", no_argument, 0, OptStreamAllIO},
 	{"stream-all-color", required_argument, 0, OptStreamAllColorTest},
+	{"version", no_argument, 0, OptVersion},
 	{0, 0, 0, 0}
 };
 
+#define STR(x) #x
+#define STRING(x) STR(x)
+
+static void print_sha()
+{
+	printf("v4l2-compliance SHA: %s", STRING(GIT_SHA));
+	printf(", %zd bits, %zd-bit time_t\n", sizeof(void *) * 8, sizeof(time_t) * 8);
+	printf("\n");
+}
+
+static void print_version()
+{
+	printf("v4l2-compliance %s%s\n", PACKAGE_VERSION, STRING(GIT_COMMIT_CNT));
+}
+
 static void usage()
 {
 	printf("Usage:\n");
@@ -241,6 +258,7 @@ static void usage()
 	printf("  -P, --no-progress  Turn off progress messages.\n");
 	printf("  -T, --trace        Trace all called ioctls.\n");
 	printf("  -v, --verbose      Turn on verbose reporting.\n");
+	printf("  --version          Show version information.\n");
 #ifndef NO_LIBV4L2
 	printf("  -w, --wrapper      Use the libv4l2 wrapper library.\n");
 #endif
@@ -1482,12 +1500,6 @@ int main(int argc, char **argv)
 	char *value, *subs;
 	int idx = 0;
 
-#define STR(x) #x
-#define STRING(x) STR(x)
-	printf("v4l2-compliance SHA: %s", STRING(GIT_SHA));
-	printf(", %zd bits, %zd-bit time_t\n", sizeof(void *) * 8, sizeof(time_t) * 8);
-	printf("\n");
-
 	if (!env_media_apps_color || !strcmp(env_media_apps_color, "auto"))
 		show_colors = isatty(STDOUT_FILENO);
 	else if (!strcmp(env_media_apps_color, "always"))
@@ -1656,6 +1668,10 @@ int main(int argc, char **argv)
 		case OptNoProgress:
 			no_progress = true;
 			break;
+		case OptVersion:
+			print_version();
+			print_sha();
+			std::exit(EXIT_SUCCESS);
 		case ':':
 			fprintf(stderr, "Option `%s' requires a value\n",
 				argv[optind]);
@@ -1677,6 +1693,9 @@ int main(int argc, char **argv)
 		usage();
 		std::exit(EXIT_FAILURE);
 	}
+
+	print_sha();
+
 	bool direct = !options[OptUseWrapper];
 	int fd;
 
-- 
2.27.0