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diff --git a/third_party/libscpi/src/fifo_private.h b/third_party/libscpi/src/fifo_private.h
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+/*-
+ * BSD 2-Clause License
+ *
+ * Copyright (c) 2012-2018, Jan Breuer
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file   scpi_fifo.h
+ * @date   Thu Nov 15 10:58:45 UTC 2012
+ * 
+ * @brief  basic FIFO implementation
+ * 
+ * 
+ */
+
+#ifndef SCPI_FIFO_H
+#define	SCPI_FIFO_H
+
+#include "scpi/types.h"
+#include "utils_private.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+    void fifo_init(scpi_fifo_t * fifo, scpi_error_t * data, int16_t size) LOCAL;
+    void fifo_clear(scpi_fifo_t * fifo) LOCAL;
+    scpi_bool_t fifo_is_empty(scpi_fifo_t * fifo) LOCAL;
+    scpi_bool_t fifo_is_full(scpi_fifo_t * fifo) LOCAL;
+    scpi_bool_t fifo_add(scpi_fifo_t * fifo, const scpi_error_t * value) LOCAL;
+    scpi_bool_t fifo_remove(scpi_fifo_t * fifo, scpi_error_t * value) LOCAL;
+    scpi_bool_t fifo_remove_last(scpi_fifo_t * fifo, scpi_error_t * value) LOCAL;
+    scpi_bool_t fifo_count(scpi_fifo_t * fifo, int16_t * value) LOCAL;
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* SCPI_FIFO_H */