Core: Make writing of log lines a single fprintf call.

Prior to this change a single line of logging performing several fprintf.

This change gets all the data for a line to be logged in a single
fprintf call. This reduced the chances of writes from another thread
getting intermixed with a log line.

It also makes it easier to change where logs are output to in the future.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/libusb/libusbi.h b/libusb/libusbi.h
index c9b402d..7293901 100644
--- a/libusb/libusbi.h
+++ b/libusb/libusbi.h
@@ -56,6 +56,11 @@
 #define USBI_CAP_HAS_HID_ACCESS					0x00010000
 #define USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER	0x00020000
 
+/* Maximum number of bytes in a log line */
+#define USBI_MAX_LOG_LEN 256
+/* Terminator for log lines */
+#define USBI_LOG_LINE_END "\n"
+
 /* The following is used to silence warnings for unused variables */
 #define UNUSED(var)			do { (void)(var); } while(0)
 
@@ -447,6 +452,11 @@ int usbi_gettimeofday(struct timeval *tp, void *tzp);
 #endif
 #endif
 
+#if (defined(OS_WINDOWS) || defined(OS_WINCE)) && !defined(__GCC__)
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+#endif
+
 struct usbi_pollfd {
 	/* must come first */
 	struct libusb_pollfd pollfd;