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/*
 * Copyright (C) 2010 InvenSense Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
// C/C++ logging functions.  See the logging documentation for API details.
//
// We'd like these to be available from C code (in case we import some from
// somewhere), so this has a C interface.
//
// The output will be correct when the log file is shared between multiple
// threads and/or multiple processes so long as the operating system
// supports O_APPEND.  These calls have mutex-protected data structures
// and so are NOT reentrant.  Do not use MPL_LOG in a signal handler.
*/
#ifndef _LIBS_CUTILS_MPL_LOG_H
#define _LIBS_CUTILS_MPL_LOG_H

#include <stdarg.h>

#ifdef ANDROID
#include <utils/Log.h>		/* For the LOG macro */
#endif

#ifdef __KERNEL__
#include <linux/kernel.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* --------------------------------------------------------------------- */

/*
 * Normally we strip MPL_LOGV (VERBOSE messages) from release builds.
 * You can modify this (for example with "#define MPL_LOG_NDEBUG 0"
 * at the top of your source file) to change that behavior.
 */
#define MPL_LOGV		/* comment this out to enable VERBOSE level logging */
#ifndef MPL_LOG_NDEBUG
#ifdef NDEBUG
#define MPL_LOG_NDEBUG 1
#else
#define MPL_LOG_NDEBUG 0
#endif
#endif

#ifdef __KERNEL__
#define MPL_LOG_UNKNOWN MPL_LOG_VERBOSE
#define MPL_LOG_DEFAULT KERN_DEFAULT
#define MPL_LOG_VERBOSE KERN_CONT
#define MPL_LOG_DEBUG   KERN_NOTICE
#define MPL_LOG_INFO    KERN_INFO
#define MPL_LOG_WARN    KERN_WARNING
#define MPL_LOG_ERROR   KERN_ERR
#define MPL_LOG_SILENT  MPL_LOG_VERBOSE

#else
	/* Based off the log priorities in android
	   /system/core/include/android/log.h */
#define MPL_LOG_UNKNOWN (0)
#define MPL_LOG_DEFAULT (1)
#define MPL_LOG_VERBOSE (2)
#define MPL_LOG_DEBUG (3)
#define MPL_LOG_INFO (4)
#define MPL_LOG_WARN (5)
#define MPL_LOG_ERROR (6)
#define MPL_LOG_SILENT (8)
#endif

/*
 * This is the local tag used for the following simplified
 * logging macros.  You can change this preprocessor definition
 * before using the other macros to change the tag.
 */
#ifndef MPL_LOG_TAG
#ifdef __KERNEL__
#define MPL_LOG_TAG
#else
#define MPL_LOG_TAG NULL
#endif
#endif

/* --------------------------------------------------------------------- */

/*
 * Simplified macro to send a verbose log message using the current MPL_LOG_TAG.
 */
#define MPL_LOGV
#ifndef MPL_LOGV
#if MPL_LOG_NDEBUG
#define MPL_LOGV(...) ((void)0)
#else
#define MPL_LOGV(...) ((void)MPL_LOG(LOG_VERBOSE, MPL_LOG_TAG, __VA_ARGS__))
#endif
#endif

#ifndef CONDITION
#define CONDITION(cond)     ((cond) != 0)
#endif

#ifndef MPL_LOGV_IF
#if MPL_LOG_NDEBUG
#define MPL_LOGV_IF(cond, ...)   ((void)0)
#else
#define MPL_LOGV_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)MPL_LOG(LOG_VERBOSE, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)
#endif
#endif

/*
 * Simplified macro to send a debug log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGD
#define MPL_LOGD(...) ((void)MPL_LOG(LOG_DEBUG, MPL_LOG_TAG, __VA_ARGS__))
#endif

#ifndef MPL_LOGD_IF
#define MPL_LOGD_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)MPL_LOG(LOG_DEBUG, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)
#endif

/*
 * Simplified macro to send an info log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGI
#define MPL_LOGI(...) ((void)MPL_LOG(LOG_INFO, MPL_LOG_TAG, __VA_ARGS__))
#endif

#ifndef MPL_LOGI_IF
#define MPL_LOGI_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)MPL_LOG(LOG_INFO, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)
#endif

/*
 * Simplified macro to send a warning log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGW
#define MPL_LOGW(...) ((void)MPL_LOG(LOG_WARN, MPL_LOG_TAG, __VA_ARGS__))
#endif

#ifndef MPL_LOGW_IF
#define MPL_LOGW_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)MPL_LOG(LOG_WARN, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)
#endif

/*
 * Simplified macro to send an error log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGE
#define MPL_LOGE(...) ((void)MPL_LOG(LOG_ERROR, MPL_LOG_TAG, __VA_ARGS__))
#endif

#ifndef MPL_LOGE_IF
#define MPL_LOGE_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)MPL_LOG(LOG_ERROR, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)
#endif

/* --------------------------------------------------------------------- */

/*
 * Log a fatal error.  If the given condition fails, this stops program
 * execution like a normal assertion, but also generating the given message.
 * It is NOT stripped from release builds.  Note that the condition test
 * is -inverted- from the normal assert() semantics.
 */
#define MPL_LOG_ALWAYS_FATAL_IF(cond, ...) \
    ((CONDITION(cond)) \
    ? ((void)android_printAssert(#cond, MPL_LOG_TAG, __VA_ARGS__)) \
    : (void)0)

#define MPL_LOG_ALWAYS_FATAL(...) \
    (((void)android_printAssert(NULL, MPL_LOG_TAG, __VA_ARGS__)))

/*
 * Versions of MPL_LOG_ALWAYS_FATAL_IF and MPL_LOG_ALWAYS_FATAL that
 * are stripped out of release builds.
 */
#if MPL_LOG_NDEBUG

#define MPL_LOG_FATAL_IF(cond, ...) ((void)0)
#define MPL_LOG_FATAL(...)          ((void)0)

#else

#define MPL_LOG_FATAL_IF(cond, ...) MPL_LOG_ALWAYS_FATAL_IF(cond, __VA_ARGS__)
#define MPL_LOG_FATAL(...)          MPL_LOG_ALWAYS_FATAL(__VA_ARGS__)

#endif

/*
 * Assertion that generates a log message when the assertion fails.
 * Stripped out of release builds.  Uses the current MPL_LOG_TAG.
 */
#define MPL_LOG_ASSERT(cond, ...) MPL_LOG_FATAL_IF(!(cond), __VA_ARGS__)
/*#define MPL_LOG_ASSERT(cond) MPL_LOG_FATAL_IF(!(cond), "Assertion failed: " #cond) */

/* --------------------------------------------------------------------- */

/*
 * Basic log message macro.
 *
 * Example:
 *  MPL_LOG(MPL_LOG_WARN, NULL, "Failed with error %d", errno);
 *
 * The second argument may be NULL or "" to indicate the "global" tag.
 */
#ifndef MPL_LOG
#define MPL_LOG(priority, tag, ...) \
    MPL_LOG_PRI(priority, tag, __VA_ARGS__)
#endif

/*
 * Log macro that allows you to specify a number for the priority.
 */
#ifndef MPL_LOG_PRI
#ifdef ANDROID
#define MPL_LOG_PRI(priority, tag, ...) \
    LOG(priority, tag, __VA_ARGS__)
#elif defined __KERNEL__
#define MPL_LOG_PRI(priority, tag, ...) \
    printk(MPL_##priority tag __VA_ARGS__)
#else
#define MPL_LOG_PRI(priority, tag, ...) \
    _MLPrintLog(MPL_##priority, tag, __VA_ARGS__)
#endif
#endif

/*
 * Log macro that allows you to pass in a varargs ("args" is a va_list).
 */
#ifndef MPL_LOG_PRI_VA
#ifdef ANDROID
#define MPL_LOG_PRI_VA(priority, tag, fmt, args) \
    android_vprintLog(priority, NULL, tag, fmt, args)
#elif defined __KERNEL__
#define MPL_LOG_PRI_VA(priority, tag, fmt, args) \
    vprintk(MPL_##priority tag fmt, args)
#else
#define MPL_LOG_PRI_VA(priority, tag, fmt, args) \
    _MLPrintVaLog(priority, NULL, tag, fmt, args)
#endif
#endif

/* --------------------------------------------------------------------- */

/*
 * ===========================================================================
 *
 * The stuff in the rest of this file should not be used directly.
 */

#ifndef ANDROID
	int _MLPrintLog(int priority, const char *tag, const char *fmt, ...);
	int _MLPrintVaLog(int priority, const char *tag, const char *fmt,
			  va_list args);
/* Final implementation of actual writing to a character device */
	int _MLWriteLog(const char *buf, int buflen);
#endif

#ifdef __cplusplus
}
#endif
#endif				/* _LIBS_CUTILS_MPL_LOG_H */