X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/25e8c0ca3422ca4c678e4ec2f6f10c57037d8163..a648584dd366450bc62a820541338fa40e93069e:/src/am7xxx.c

diff --git a/src/am7xxx.c b/src/am7xxx.c
index eb715d3..8573a59 100644
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -30,11 +30,22 @@
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
-/* If we're not using GNU C, elide __attribute__
+/*
+ * If we're not using GNU C, elide __attribute__
  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  */
 #ifndef __GNUC__
-#  define  __attribute__(x)  /* NOTHING */
+	#define  __attribute__(x)  /* NOTHING */
+#endif
+
+/*
+ * Fix printf format when compiling for Windows with MinGW, see:
+ * https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/
+ */
+#ifdef __MINGW_PRINTF_FORMAT
+	#define AM7XXX_PRINTF_FORMAT __MINGW_PRINTF_FORMAT
+#else
+	#define AM7XXX_PRINTF_FORMAT printf
 #endif
 
 /* Control shared library symbols visibility */
@@ -56,7 +67,7 @@ static void log_message(am7xxx_context *ctx,
 			const char *function_name,
 			int line,
 			const char *fmt,
-			...) __attribute__ ((format (printf, 5, 6)));
+			...) __attribute__ ((format (AM7XXX_PRINTF_FORMAT, 5, 6)));
 
 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
@@ -414,7 +425,7 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 	return 0;
 }
 
-static void send_data_async_complete_cb(struct libusb_transfer *transfer)
+static void LIBUSB_CALL send_data_async_complete_cb(struct libusb_transfer *transfer)
 {
 	am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
 	int *completed = &(dev->transfer_completed);
@@ -1093,8 +1104,7 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 	*ctx = malloc(sizeof(**ctx));
 	if (*ctx == NULL) {
 		fatal("cannot allocate the context (%s)\n", strerror(errno));
-		ret = -ENOMEM;
-		goto out;
+		return -ENOMEM;
 	}
 	memset(*ctx, 0, sizeof(**ctx));
 
@@ -1180,14 +1190,14 @@ AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 	 * is the first one to be sent to the device in order for it to
 	 * successfully return the correct device information.
 	 *
-	 * So, if there is not a cached version of it (from a previous open),
-	 * we ask for device info at open time,
+	 * NOTE: am7xxx_get_device_info() will fetch the actual device info
+	 * from the device only the very first time it's called for a given
+	 * device, otherwise, it'll return a cached version of the device info
+	 * (from a previous call to am7xxx_open_device(), for instance).
 	 */
-	if ((*dev)->device_info == NULL) {
-		ret = am7xxx_get_device_info(*dev, NULL);
-		if (ret < 0)
-			error(ctx, "cannot get device info\n");
-	}
+	ret = am7xxx_get_device_info(*dev, NULL);
+	if (ret < 0)
+		error(ctx, "cannot get device info\n");
 
 out:
 	return ret;
@@ -1214,10 +1224,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 	int ret;
 	struct am7xxx_header h;
 
-	if (dev->device_info) {
-		memcpy(device_info, dev->device_info, sizeof(*device_info));
-		return 0;
-	}
+	/* if there is a cached copy of the device info, just return that */
+	if (dev->device_info)
+		goto return_value;
 
 	ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
 	if (ret < 0)
@@ -1231,8 +1240,8 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 	if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
 		error(dev->ctx, "expected packet type: %d, got %d instead!\n",
 		      AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
-		errno = ENOTSUP;
-		return -ENOTSUP;
+		errno = EINVAL;
+		return -EINVAL;
 	}
 
 	dev->device_info = malloc(sizeof(*dev->device_info));
@@ -1251,6 +1260,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 	dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
 #endif
 
+return_value:
+	if (device_info)
+		memcpy(device_info, dev->device_info, sizeof(*device_info));
 	return 0;
 }