text: /****************************************************************************
   * libc/time/lib_daysbeforemonth.c
   *
   *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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 NuttX 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 OWNER 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  
  #include <nuttx/time.h>
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  static const uint16_t g_daysbeforemonth[13] =
  {
    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
  };
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Function:  clock_daysbeforemonth
   *
   * Description:
   *    Get the number of days that occurred before the beginning of the
   *    month.
   *
   * Input Parameters:
   *    month    - The month in the form of tm_mon, that is a range of 0-11.
   *    leapyear - True if leap year and there are 29 days in February.
   *               NOTE the month=1 is February.
   *
   * Returned Value:
   *    The number of days that occurred before the month
   *
   ****************************************************************************/
  
  int clock_daysbeforemonth(int month, bool leapyear)
  {
    int retval = g_daysbeforemonth[month];
    if (month >= 2 && leapyear)
      {
        retval++;
      }
  
    return retval;
  }
  
  
  