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+/*
+ * Amazon FreeRTOS Common V1.0.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file iot_logging.h
+ * @brief Generic logging function header file.
+ *
+ * Declares the generic logging function and the log levels. This file never
+ * needs to be included in source code. The header iot_logging_setup.h should
+ * be included instead.
+ *
+ * @see iot_logging_setup.h
+ */
+
+#ifndef IOT_LOGGING_H_
+#define IOT_LOGGING_H_
+
+/* The config header is always included first. */
+#include "iot_config.h"
+
+/* Standard includes. */
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * @constantspage{logging,logging library}
+ *
+ * @section logging_constants_levels Log levels
+ * @brief Log levels for the libraries in this SDK.
+ *
+ * Each library should specify a log level by setting @ref LIBRARY_LOG_LEVEL.
+ * All log messages with a level at or below the specified level will be printed
+ * for that library.
+ *
+ * Currently, there are 4 log levels. In the order of lowest to highest, they are:
+ * - #IOT_LOG_NONE <br>
+ * @copybrief IOT_LOG_NONE
+ * - #IOT_LOG_ERROR <br>
+ * @copybrief IOT_LOG_ERROR
+ * - #IOT_LOG_WARN <br>
+ * @copybrief IOT_LOG_WARN
+ * - #IOT_LOG_INFO <br>
+ * @copybrief IOT_LOG_INFO
+ * - #IOT_LOG_DEBUG <br>
+ * @copybrief IOT_LOG_DEBUG
+ */
+
+/**
+ * @brief No log messages.
+ *
+ * Log messages with this level will be silently discarded. When @ref
+ * LIBRARY_LOG_LEVEL is #IOT_LOG_NONE, logging is disabled and no [logging functions]
+ * (@ref logging_functions) can be called.
+ */
+#define IOT_LOG_NONE 0
+
+/**
+ * @brief Only critical, unrecoverable errors.
+ *
+ * Log messages with this level will be printed when a library encounters an
+ * error from which it cannot easily recover.
+ */
+#define IOT_LOG_ERROR 1
+
+/**
+ * @brief Message about an abnormal but recoverable event.
+ *
+ * Log messages with this level will be printed when a library encounters an
+ * abnormal event that may be indicative of an error. Libraries should continue
+ * execution after logging a warning.
+ */
+#define IOT_LOG_WARN 2
+
+/**
+ * @brief A helpful, informational message.
+ *
+ * Log messages with this level may indicate the normal status of a library
+ * function. They should be used to track how far a program has executed.
+ */
+#define IOT_LOG_INFO 3
+
+/**
+ * @brief Detailed and excessive debug information.
+ *
+ * Log messages with this level are intended for developers. They may contain
+ * excessive information such as internal variables, buffers, or other specific
+ * information.
+ */
+#define IOT_LOG_DEBUG 4
+
+/**
+ * @paramstructs{logging,logging}
+ */
+
+/**
+ * @ingroup logging_datatypes_paramstructs
+ * @brief Log message configuration struct.
+ *
+ * @paramfor @ref logging_function_log, @ref logging_function_generic
+ *
+ * By default, log messages print the library name, log level, and a timestring.
+ * This struct can be passed to @ref logging_function_generic to disable one of
+ * the above components in the log message.
+ *
+ * <b>Example:</b>
+ *
+ * @code{c}
+ * IotLog_Generic( IOT_LOG_DEBUG, "SAMPLE", IOT_LOG_DEBUG, NULL, "Hello world!" );
+ * @endcode
+ * The code above prints the following message:
+ * @code
+ * [DEBUG][SAMPLE][2018-01-01 12:00:00] Hello world!
+ * @endcode
+ *
+ * The timestring can be disabled as follows:
+ * @code
+ * IotLogConfig_t logConfig = { .hideLogLevel = false, .hideLibraryName = false, .hideTimestring = true};
+ * IotLog_Generic( IOT_LOG_DEBUG, "SAMPLE", IOT_LOG_DEBUG, &logConfig, "Hello world!" );
+ * @endcode
+ * The resulting log message will be:
+ * @code
+ * [DEBUG][SAMPLE] Hello world!
+ * @endcode
+ */
+typedef struct IotLogConfig
+{
+ bool hideLogLevel; /**< @brief Don't print the log level string for this message. */
+ bool hideLibraryName; /**< @brief Don't print the library name for this message. */
+ bool hideTimestring; /**< @brief Don't print the timestring for this message. */
+} IotLogConfig_t;
+
+/**
+ * @functionspage{logging,logging library}
+ *
+ * - @functionname{logging_function_log}
+ * - @functionname{logging_function_printbuffer}
+ * - @functionname{logging_function_generic}
+ * - @functionname{logging_function_genericprintbuffer}
+ */
+
+/**
+ * @functionpage{IotLog_Generic,logging,generic}
+ * @functionpage{IotLog_PrintBuffer,logging,genericprintbuffer}
+ */
+
+/**
+ * @brief Generic logging function that prints a single message.
+ *
+ * This function is the generic logging function shared across all libraries.
+ * The library-specific logging function @ref logging_function_log is implemented
+ * using this function. Like @ref logging_function_log, this function is only
+ * available when @ref LIBRARY_LOG_LEVEL is #IOT_LOG_NONE.
+ *
+ * In most cases, the library-specific logging function @ref logging_function_log
+ * should be called instead of this function.
+ *
+ * @param[in] libraryLogSetting The log level setting of the library, used to
+ * determine if the log message should be printed. Must be one of the @ref
+ * logging_constants_levels.
+ * @param[in] pLibraryName The library name to print. See @ref LIBRARY_LOG_NAME.
+ * @param[in] messageLevel The log level of the this message. See @ref LIBRARY_LOG_LEVEL.
+ * @param[in] pLogConfig Pointer to a #IotLogConfig_t. Optional; pass `NULL` to ignore.
+ * @param[in] pFormat Format string for the log message.
+ * @param[in] ... Arguments for format specification.
+ *
+ * @return No return value. On errors, it prints nothing.
+ */
+/* @[declare_logging_generic] */
+void IotLog_Generic( int libraryLogSetting,
+ const char * const pLibraryName,
+ int messageLevel,
+ const IotLogConfig_t * const pLogConfig,
+ const char * const pFormat,
+ ... );
+/* @[declare_logging_generic] */
+
+/**
+ * @brief Generic function to log the contents of a buffer as bytes.
+ *
+ * This function is the generic buffer logging function shared across all libraries.
+ * The library-specific buffer logging function @ref logging_function_printbuffer is
+ * implemented using this function. Like @ref logging_function_printbuffer, this
+ * function is only available when @ref LIBRARY_LOG_LEVEL is #IOT_LOG_DEBUG.
+ *
+ * In most cases, the library-specific buffer logging function @ref
+ * logging_function_printbuffer should be called instead of this function.
+ *
+ * @param[in] pLibraryName The library name to print with the log. See @ref LIBRARY_LOG_NAME.
+ * @param[in] pHeader A message to print before printing the buffer.
+ * @param[in] pBuffer The buffer to print.
+ * @param[in] bufferSize The number of bytes in `pBuffer` to print.
+ *
+ * @return No return value. On errors, it prints nothing.
+ *
+ * @note To conserve memory, this function only allocates enough memory for a
+ * single line of output. Therefore, in multithreaded systems, its output may
+ * appear "fragmented" if other threads are logging simultaneously.
+ */
+/* @[declare_logging_genericprintbuffer] */
+void IotLog_GenericPrintBuffer( const char * const pLibraryName,
+ const char * const pHeader,
+ const uint8_t * const pBuffer,
+ size_t bufferSize );
+/* @[declare_logging_genericprintbuffer] */
+
+#endif /* ifndef IOT_LOGGING_H_ */