/*
 * Copyright 2019-2021 OARC, Inc.
 * Copyright 2017-2018 Akamai Technologies
 * Copyright 2006-2016 Nominum, Inc.
 * All rights reserved.
 *
 * 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.
 */

#include "config.h"

#include "log.h"

#include "util.h"

#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

static bool log_err_stdout = false;

pthread_mutex_t log_lock = PTHREAD_MUTEX_INITIALIZER;

static void
vlog(FILE* stream, const char* prefix, const char* fmt, va_list args)
{
    PERF_LOCK(&log_lock);
    fflush(stdout);
    if (prefix != NULL)
        fprintf(stream, "%s: ", prefix);
    vfprintf(stream, fmt, args);
    fprintf(stream, "\n");
    PERF_UNLOCK(&log_lock);
}

void perf_log_printf(const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    vlog(stdout, NULL, fmt, args);
}

void perf_log_fatal(const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    vlog(log_err_stdout ? stdout : stderr, "Error", fmt, args);
    exit(1);
}

void perf_log_warning(const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    vlog(log_err_stdout ? stdout : stderr, "Warning", fmt, args);
}

void perf_log_tostdout(void)
{
    log_err_stdout = true;
}
