text: /*
   * (C)2012 Michael Duane Rice All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   * Redistributions of source code must retain the above copyright notice, this
   * list of conditions and the following disclaimer. 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. Neither the name of the copyright holders
   * nor the names of 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.
   */
  
  /* $Id: month_length.c 2358 2013-04-23 22:30:20Z swfltek $ */
  
  /*
      Return the length of a month in days, given the year and month in question.
      The month parameter must be '1 based', ranging from 1 to 12.
  */
  
  #include <time.h>
  
  uint8_t
  month_length(int year, uint8_t month)
  {
      if (month == 2)
          return 28 + is_leap_year(year);
  
      /* 'knuckles' algorithm */
      if (month > 7)
          month++;
      return 30 + (month & 1);
  }
  