From 1b45f3e735f5a8b0423640e11622233a6c03de01 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ao2@ao2.it>
Date: Sun, 10 Jan 2016 10:03:55 +0100
Subject: [PATCH] visomat-data-downloader: add an option to enable libusb debug
 output

---
 src/Makefile                  |  3 +++
 src/visomat-data-downloader.c | 32 ++++++++++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index 4ac4019..79105ea 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -36,6 +36,9 @@ ifeq ($(DEBUG),1)
   CFLAGS += -DDEBUG
 endif
 
+# for getopt
+CFLAGS += -D_POSIX_C_SOURCE=2
+
 CFLAGS += $(shell pkg-config --cflags libusb-1.0)
 LDLIBS := $(shell pkg-config --libs libusb-1.0)
 
diff --git a/src/visomat-data-downloader.c b/src/visomat-data-downloader.c
index 69f62d6..2ea275a 100644
--- a/src/visomat-data-downloader.c
+++ b/src/visomat-data-downloader.c
@@ -20,6 +20,7 @@
  */
 
 #include <stdio.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
@@ -355,12 +356,38 @@ static int visomat_get_datetime(visomat_device *dev)
 	return 0;
 }
 
-int main(void)
+static void usage(const char *name)
+{
+	printf("usage: %s [OPTIONS]\n\n", name);
+	printf("OPTIONS:\n");
+	printf("\t-D\t\tenable libusb debug output\n");
+	printf("\t-h\t\tthis help message\n");
+}
+
+int main(int argc, char *argv[])
 {
 	int ret;
+	int opt;
+	bool enable_libusb_debug = false;
 	libusb_device_handle *dev;
 	int current_configuration;
 
+	while ((opt = getopt(argc, argv, "Dh")) != -1) {
+		switch (opt) {
+		case 'D':
+			enable_libusb_debug = true;
+			break;
+		case 'h':
+			usage(argv[0]);
+			ret = 0;
+			goto out;
+		default: /* '?' */
+			usage(argv[0]);
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
 	ret = libusb_init(NULL);
 	if (ret < 0) {
 		fprintf(stderr, "libusb_init failed: %s\n",
@@ -368,7 +395,8 @@ int main(void)
 		goto out;
 	}
 
-	libusb_set_debug(NULL, LIBUSB_LOG_LEVEL_INFO);
+	libusb_set_debug(NULL, enable_libusb_debug ?
+			 LIBUSB_LOG_LEVEL_DEBUG : LIBUSB_LOG_LEVEL_INFO);
 
 	dev = libusb_open_device_with_vid_pid(NULL,
 					      VISOMAT_DEVICE_VID,
-- 
2.1.4