Merge pull request #2 from gizero/fix-return-values-attribute-writes

Fix return values attribute writes

device.c

@@ -499,26 +499,38 @@ int iio_device_attr_read_double(const struct iio_device *dev,
 int iio_device_attr_write_longlong(const struct iio_device *dev,
 		const char *attr, long long val)
 {
+	ssize_t ret;
 	char buf[1024];
+
 	snprintf(buf, sizeof(buf), "%lld", val);
-	return iio_device_attr_write(dev, attr, buf);
+	ret = iio_device_attr_write(dev, attr, buf);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_attr_write_double(const struct iio_device *dev,
 		const char *attr, double val)
 {
+	ssize_t ret;
 	char buf[1024];
+
 	snprintf(buf, sizeof(buf), "%lf", val);
-	return iio_device_attr_write(dev, attr, buf);
+	ret = iio_device_attr_write(dev, attr, buf);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_attr_write_bool(const struct iio_device *dev,
 		const char *attr, bool val)
 {
+	ssize_t ret;
+
 	if (val)
-		return iio_device_attr_write(dev, attr, "1");
+		ret = iio_device_attr_write(dev, attr, "1");
 	else
-		return iio_device_attr_write(dev, attr, "0");
+		ret = iio_device_attr_write(dev, attr, "0");
+
+	return ret < 0 ? ret : 0;
 }
 
 ssize_t iio_device_debug_attr_read(const struct iio_device *dev,
@@ -608,26 +620,38 @@ int iio_device_debug_attr_read_double(const struct iio_device *dev,
 int iio_device_debug_attr_write_longlong(const struct iio_device *dev,
 		const char *attr, long long val)
 {
+	ssize_t ret;
+
 	char buf[1024];
 	snprintf(buf, sizeof(buf), "%lld", val);
-	return iio_device_debug_attr_write(dev, attr, buf);
+	ret = iio_device_debug_attr_write(dev, attr, buf);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_debug_attr_write_double(const struct iio_device *dev,
 		const char *attr, double val)
 {
+	ssize_t ret;
+
 	char buf[1024];
 	snprintf(buf, sizeof(buf), "%lf", val);
-	return iio_device_debug_attr_write(dev, attr, buf);
+	ret = iio_device_debug_attr_write(dev, attr, buf);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_debug_attr_write_bool(const struct iio_device *dev,
 		const char *attr, bool val)
 {
+	ssize_t ret;
+
 	if (val)
-		return iio_device_debug_attr_write_raw(dev, attr, "1", 2);
+		ret = iio_device_debug_attr_write_raw(dev, attr, "1", 2);
 	else
-		return iio_device_debug_attr_write_raw(dev, attr, "0", 2);
+		ret = iio_device_debug_attr_write_raw(dev, attr, "0", 2);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_identify_filename(const struct iio_device *dev,
@@ -672,9 +696,13 @@ int iio_device_identify_filename(const struct iio_device *dev,
 int iio_device_reg_write(struct iio_device *dev,
 		uint32_t address, uint32_t value)
 {
+	ssize_t ret;
+
 	char buf[1024];
 	snprintf(buf, sizeof(buf), "0x%x 0x%x", address, value);
-	return iio_device_debug_attr_write(dev, "direct_reg_access", buf);
+	ret = iio_device_debug_attr_write(dev, "direct_reg_access", buf);
+
+	return ret < 0 ? ret : 0;
 }
 
 int iio_device_reg_read(struct iio_device *dev,