From: Antonio Ospite <ao2@ao2.it>
Date: Wed, 10 Jun 2015 09:49:31 +0000 (+0200)
Subject: Improve error messages relative to libusb calls failures
X-Git-Url: https://git.ao2.it/visomat-utils.git/commitdiff_plain/687aee331eeb10d36367dc6a6c612a5466fc40df?ds=sidebyside

Improve error messages relative to libusb calls failures
---

diff --git a/src/visomat-data-downloader.c b/src/visomat-data-downloader.c
index 8cb99e2..f93757d 100644
--- a/src/visomat-data-downloader.c
+++ b/src/visomat-data-downloader.c
@@ -21,6 +21,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <unistd.h>
 #include <libusb.h>
@@ -319,7 +320,7 @@ int main(void)
 
 	ret = libusb_init(NULL);
 	if (ret < 0) {
-		fprintf(stderr, "error (%d): cannot initialize libusb.\n", ret);
+		fprintf(stderr, "libusb_init failed: %s\n", libusb_error_name(ret));
 		goto out;
 	}
 
@@ -329,15 +330,17 @@ int main(void)
 					      VISOMAT_DEVICE_VID,
 					      VISOMAT_DEVICE_PID);
 	if (dev == NULL) {
-		fprintf(stderr, "error (%d): cannot open device.\n", errno);
+		fprintf(stderr, "libusb_open failed: %s\n", strerror(errno));
 		ret = -errno;
 		goto out_libusb_exit;
 	}
 
 	ret = libusb_set_configuration(dev, VISOMAT_CONFIGURATION);
 	if (ret < 0) {
-		fprintf(stderr, "error (%d): cannot set configuration %d.\n",
-			ret, VISOMAT_CONFIGURATION);
+		fprintf(stderr, "libusb_set_configuration failed: %s\n",
+			libusb_error_name(ret));
+		fprintf(stderr, "Cannot set configuration %hhu\n",
+			VISOMAT_CONFIGURATION);
 		goto out_libusb_close;
 	}
 
@@ -345,8 +348,10 @@ int main(void)
 
 	ret = libusb_claim_interface(dev, VISOMAT_INTERFACE);
 	if (ret < 0) {
-		fprintf(stderr, "error (%d): cannot claim interface %d.\n",
-			ret, VISOMAT_INTERFACE);
+		fprintf(stderr, "libusb_claim_interface failed: %s\n",
+			libusb_error_name(ret));
+		fprintf(stderr, "Cannot claim interface %hhu\n",
+			VISOMAT_INTERFACE);
 		goto out_libusb_close;
 	}