/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#include <cstdarg>
#include <stdio.h>

#include <fb/assert.h>
#include <fb/log.h>

namespace facebook {

#define ASSERT_BUF_SIZE 4096
static char sAssertBuf[ASSERT_BUF_SIZE];
static AssertHandler gAssertHandler;

void assertInternal(const char* formatstr ...) {
    va_list va_args;
    va_start(va_args, formatstr);
    vsnprintf(sAssertBuf, sizeof(sAssertBuf), formatstr, va_args);
    va_end(va_args);
    if (gAssertHandler != NULL) {
        gAssertHandler(sAssertBuf);
    }
    FBLOG(LOG_FATAL, "fbassert", "%s", sAssertBuf);
    // crash at this specific address so that we can find our crashes easier
    *(int*)0xdeadb00c = 0;
    // let the compiler know we won't reach the end of the function
     __builtin_unreachable();
}

void setAssertHandler(AssertHandler assertHandler) {
    gAssertHandler = assertHandler;
}

} // namespace facebook