src/main/c/Posix/SerialPort_Posix.c [1052:1062]:
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JNIEXPORT jint JNICALL Java_com_fazecast_jSerialComm_SerialPort_writeBytes(JNIEnv *env, jobject obj, jlong serialPortPointer, jbyteArray buffer, jint bytesToWrite, jint offset, jint timeoutMode)
{
	// Ensure that a positive number of bytes was passed in to write
	serialPort *port = (serialPort*)(intptr_t)serialPortPointer;
	if ((bytesToWrite < 0) || (offset < 0))
		return -1;

	// Fetch a pointer to the underlying data buffer
	jsize bufferLength = (*env)->GetArrayLength(env, buffer);
	if ((bytesToWrite + offset) > bufferLength)
		bytesToWrite = bufferLength - offset;
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src/main/c/Windows/SerialPort_Windows.c [1320:1330]:
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JNIEXPORT jint JNICALL Java_com_fazecast_jSerialComm_SerialPort_writeBytes(JNIEnv *env, jobject obj, jlong serialPortPointer, jbyteArray buffer, jint bytesToWrite, jint offset, jint timeoutMode)
{
	// Ensure that a positive number of bytes was passed in to write
	serialPort *port = (serialPort*)(intptr_t)serialPortPointer;
	if ((bytesToWrite < 0) || (offset < 0))
		return -1;

	// Fetch a pointer to the underlying data buffer
	jsize bufferLength = (*env)->GetArrayLength(env, buffer);
	if ((bytesToWrite + offset) > bufferLength)
		bytesToWrite = bufferLength - offset;
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