/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. 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.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  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.
 */

#include "platform-posix.h"
#include <openthread-core-config.h>
#include <openthread/config.h>

#include <ctype.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>

#include <openthread/platform/logging.h>
#include <openthread/platform/toolchain.h>

#include "utils/code_utils.h"

// Macro to append content to end of the log string.

#define LOG_PRINTF(...)                                                                   \
    charsWritten = snprintf(&logString[offset], sizeof(logString) - offset, __VA_ARGS__); \
    otEXPECT_ACTION(charsWritten >= 0, logString[offset] = 0);                            \
    offset += (unsigned int)charsWritten;                                                 \
    otEXPECT_ACTION(offset < sizeof(logString), logString[sizeof(logString) - 1] = 0)

#if (OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_PLATFORM_DEFINED) || \
    (OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_NCP_SPINEL)
OT_TOOL_WEAK void otPlatLog(otLogLevel aLogLevel, otLogRegion aLogRegion, const char *aFormat, ...)
{
    OT_UNUSED_VARIABLE(aLogLevel);
    OT_UNUSED_VARIABLE(aLogRegion);

    char         logString[512];
    unsigned int offset;
    int          charsWritten;
    va_list      args;

    offset = 0;

    LOG_PRINTF("[%d] ", gNodeId);

    va_start(args, aFormat);
    charsWritten = vsnprintf(&logString[offset], sizeof(logString) - offset, aFormat, args);
    va_end(args);

    otEXPECT_ACTION(charsWritten >= 0, logString[offset] = 0);

exit:
    syslog(LOG_CRIT, "%s", logString);
}

#endif // #if (OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_PLATFORM_DEFINED)