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+/**
+ * @file in_internal.h
+ * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @author Michal Vasko <mvasko@cesnet.cz>
+ * @brief Internal structures and functions for libyang parsers
+ *
+ * Copyright (c) 2020 - 2023 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#ifndef LY_IN_INTERNAL_H_
+#define LY_IN_INTERNAL_H_
+
+#include "in.h"
+
+/**
+ * @brief Parser input structure specifying where the data are read.
+ */
+struct ly_in {
+    LY_IN_TYPE type;        /**< type of the output to select the output method */
+    const char *current;    /**< Current position in the input data */
+    const char *func_start; /**< Input data position when the last parser function was executed */
+    const char *start;      /**< Input data start */
+    size_t length;          /**< mmap() length (if used) */
+
+    union {
+        int fd;             /**< file descriptor for LY_IN_FD type */
+        FILE *f;            /**< file structure for LY_IN_FILE and LY_IN_FILEPATH types */
+
+        struct {
+            int fd;         /**< file descriptor for LY_IN_FILEPATH */
+            char *filepath; /**< stored original filepath */
+        } fpath;            /**< filepath structure for LY_IN_FILEPATH */
+    } method;               /**< type-specific information about the output */
+    uint64_t line;          /**< current line of the input */
+};
+
+/**
+ * @brief Increment line counter.
+ * @param[in] IN The input handler.
+ */
+#define LY_IN_NEW_LINE(IN) \
+    (IN)->line++
+
+#endif /* LY_IN_INTERNAL_H_ */