names.c: if a string can not be found in the usb.ids file, return [unknown]

For interfaces or other USB strings, if they are not in the current
hardware database, return "[unknown]" to give people a chance to
understand why their device isn't reporting anything for those fields.

This changes the output of a line that previous looked like:
	|__ Port 004: Dev 006, If 0, Class=, Driver=, 12M
to be:
	|__ Port 004: Dev 006, If 0, Class=[unknown], Driver=, 12M

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/names.c b/names.c
index beae8f8..1adb5a4 100644
--- a/names.c
+++ b/names.c
@@ -192,7 +192,7 @@ int get_vendor_string(char *buf, size_t size, uint16_t vid)
                 return 0;
         *buf = 0;
         if (!(cp = names_vendor(vid)))
-                return 0;
+		return snprintf(buf, size, "[unknown]");
         return snprintf(buf, size, "%s", cp);
 }
 
@@ -204,7 +204,7 @@ int get_product_string(char *buf, size_t size, uint16_t vid, uint16_t pid)
                 return 0;
         *buf = 0;
         if (!(cp = names_product(vid, pid)))
-                return 0;
+		return snprintf(buf, size, "[unknown]");
         return snprintf(buf, size, "%s", cp);
 }
 
@@ -216,7 +216,7 @@ int get_class_string(char *buf, size_t size, uint8_t cls)
 		return 0;
 	*buf = 0;
 	if (!(cp = names_class(cls)))
-		return 0;
+		return snprintf(buf, size, "[unknown]");
 	return snprintf(buf, size, "%s", cp);
 }
 
@@ -228,7 +228,7 @@ int get_subclass_string(char *buf, size_t size, uint8_t cls, uint8_t subcls)
 		return 0;
 	*buf = 0;
 	if (!(cp = names_subclass(cls, subcls)))
-		return 0;
+		return snprintf(buf, size, "[unknown]");
 	return snprintf(buf, size, "%s", cp);
 }