libs/libc/time/lib_isleapyear.c

/****************************************************************************
 * libs/libc/time/lib_isleapyear.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <nuttx/clock.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Type Declarations
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Public Constant Data
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/****************************************************************************
 * Public Data
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/****************************************************************************
 * Private Data
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/****************************************************************************
 * Private Functions
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/****************************************************************************
 * Public Functions
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/****************************************************************************
 * Name:  clock_isleapyear
 *
 * Description:
 *    Return true if the specified year is a leap year
 *
 ****************************************************************************/

int clock_isleapyear(int year)
{
  return (year % 400) ? ((year % 100) ? ((year % 4) ? 0 : 1) : 0) : 1;
}