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diff --git a/src/libzscanner/error.h b/src/libzscanner/error.h
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+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*!
+ * \file
+ *
+ * \brief Error codes and handling.
+ *
+ * \addtogroup zone_scanner
+ * @{
+ */
+
+#pragma once
+
+enum err_codes {
+ ZS_OK = 0,
+ ZS_EINVAL = -1000,
+ ZS_ENOMEM,
+ ZS_FILE_OPEN,
+ ZS_FILE_INVALID,
+ ZS_DOS_NEWLINE,
+ ZS_UNCOVERED_STATE,
+ ZS_UNCLOSED_MULTILINE,
+ ZS_LEFT_PARENTHESIS,
+ ZS_RIGHT_PARENTHESIS,
+ ZS_UNSUPPORTED_TYPE,
+ ZS_BAD_PREVIOUS_OWNER,
+ ZS_BAD_DNAME_CHAR,
+ ZS_BAD_OWNER,
+ ZS_LABEL_OVERFLOW,
+ ZS_DNAME_OVERFLOW,
+ ZS_BAD_NUMBER,
+ ZS_NUMBER64_OVERFLOW,
+ ZS_NUMBER32_OVERFLOW,
+ ZS_NUMBER16_OVERFLOW,
+ ZS_NUMBER8_OVERFLOW,
+ ZS_FLOAT_OVERFLOW,
+ ZS_RDATA_OVERFLOW,
+ ZS_ITEM_OVERFLOW,
+ ZS_BAD_ADDRESS_CHAR,
+ ZS_BAD_IPV4,
+ ZS_BAD_IPV6,
+ ZS_BAD_GATEWAY,
+ ZS_BAD_GATEWAY_KEY,
+ ZS_BAD_APL,
+ ZS_BAD_RDATA,
+ ZS_BAD_HEX_RDATA,
+ ZS_BAD_HEX_CHAR,
+ ZS_BAD_BASE64_CHAR,
+ ZS_BAD_BASE32HEX_CHAR,
+ ZS_BAD_REST,
+ ZS_BAD_TIMESTAMP_CHAR,
+ ZS_BAD_TIMESTAMP_LENGTH,
+ ZS_BAD_TIMESTAMP,
+ ZS_BAD_DATE,
+ ZS_BAD_TIME,
+ ZS_BAD_TIME_UNIT,
+ ZS_BAD_BITMAP,
+ ZS_TEXT_OVERFLOW,
+ ZS_BAD_TEXT_CHAR,
+ ZS_BAD_TEXT,
+ ZS_BAD_DIRECTIVE,
+ ZS_BAD_TTL,
+ ZS_BAD_ORIGIN,
+ ZS_BAD_INCLUDE_FILENAME,
+ ZS_BAD_INCLUDE_ORIGIN,
+ ZS_UNPROCESSED_INCLUDE,
+ ZS_UNOPENED_INCLUDE,
+ ZS_BAD_RDATA_LENGTH,
+ ZS_CANNOT_TEXT_DATA,
+ ZS_BAD_LOC_DATA,
+ ZS_UNKNOWN_BLOCK,
+ ZS_BAD_ALGORITHM,
+ ZS_BAD_CERT_TYPE,
+ ZS_BAD_EUI_LENGTH,
+ ZS_BAD_L64_LENGTH,
+ ZS_BAD_CHAR_COLON,
+ ZS_BAD_CHAR_DASH
+};
+
+/*!
+ * \brief Returns error message for the given error code.
+ *
+ * \param code Error code.
+ *
+ * \return String containing the error message.
+ */
+const char* zs_strerror(const int code);
+
+/*!
+ * \brief Returns error code name of the given error code.
+ *
+ * \param code Error code.
+ *
+ * \return String containing the error code name.
+ */
+const char* zs_errorname(const int code);
+
+/*! @} */