From: Antonio Ospite <ao2@ao2.it>
Date: Wed, 10 Jun 2015 10:18:49 +0000 (+0200)
Subject: am7xxx-modeswitch: improve messages relative to libusb failures
X-Git-Tag: v0.1.6~20
X-Git-Url: https://git.ao2.it/libam7xxx.git/commitdiff_plain/46ebffe793cee66f039f7706c955138a4002e108?ds=sidebyside;hp=028846b8800dd3ebcc530b20164a8e37602c546c

am7xxx-modeswitch: improve messages relative to libusb failures
---

diff --git a/examples/am7xxx-modeswitch.c b/examples/am7xxx-modeswitch.c
index f719f03..8e528c6 100644
--- a/examples/am7xxx-modeswitch.c
+++ b/examples/am7xxx-modeswitch.c
@@ -17,6 +17,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 #include <libusb.h>
 
@@ -39,8 +40,11 @@ int main(void)
 	unsigned int len;
 
 	ret = libusb_init(NULL);
-	if (ret < 0)
+	if (ret < 0) {
+		fprintf(stderr, "libusb_init failed: %s\n",
+			libusb_error_name(ret));
 		goto out;
+	}
 
 	libusb_set_debug(NULL, LIBUSB_LOG_LEVEL_INFO);
 
@@ -48,14 +52,17 @@ int main(void)
 						     AM7XXX_STORAGE_VID,
 						     AM7XXX_STORAGE_PID);
 	if (usb_device == NULL) {
-		fprintf(stderr, "cannot open the device: %d.\n", errno);
+		fprintf(stderr, "libusb_open failed: %s\n", strerror(errno));
 		ret = -errno;
 		goto out;
 	}
 
 	ret = libusb_set_configuration(usb_device, AM7XXX_STORAGE_CONFIGURATION);
 	if (ret < 0) {
-		fprintf(stderr, "cannot set configuration.\n");
+		fprintf(stderr, "libusb_set_configuration failed: %s\n",
+			libusb_error_name(ret));
+		fprintf(stderr, "Cannot set configuration %hhu\n",
+			AM7XXX_STORAGE_CONFIGURATION);
 		goto out_libusb_close;
 	}
 
@@ -63,7 +70,10 @@ int main(void)
 
 	ret = libusb_claim_interface(usb_device, AM7XXX_STORAGE_INTERFACE);
 	if (ret < 0) {
-		fprintf(stderr, "cannot claim interface.\n");
+		fprintf(stderr, "libusb_claim_interface failed: %s\n",
+			libusb_error_name(ret));
+		fprintf(stderr, "Cannot claim interface %hhu\n",
+			AM7XXX_STORAGE_INTERFACE);
 		goto out_libusb_close;
 	}