/* * Copyright (C) 1998 by Southwest Research Institute (SwRI) * * All rights reserved under U.S. Copyright Law and International Conventions. * * The development of this Software was supported by contracts NAG5-3148, * NAG5-6855, NAS8-36840, NAG5-2323, and NAG5-7043 issued on behalf of * the United States Government by its National Aeronautics and Space * Administration. Southwest Research Institute grants to the Government, * and others acting on its behalf, a paid-up nonexclusive, irrevocable, * worldwide license to reproduce, prepare derivative works, and perform * publicly and display publicly, by or on behalf of the Government. * Other than those rights granted to the United States Government, no part * of this Software may be reproduced in any form or by any means, electronic * or mechanical, including photocopying, without permission in writing from * Southwest Research Institute. All inquiries should be addressed to: * * Director of Contracts * Southwest Research Institute * P. O. Drawer 28510 * San Antonio, Texas 78228-0510 * * * Use of this Software is governed by the terms of the end user license * agreement, if any, which accompanies or is included with the Software * (the "License Agreement"). An end user will be unable to install any * Software that is accompanied by or includes a License Agreement, unless * the end user first agrees to the terms of the License Agreement. Except * as set forth in the applicable License Agreement, any further copying, * reproduction or distribution of this Software is expressly prohibited. * Installation assistance, product support and maintenance, if any, of the * Software is available from SwRI and/or the Third Party Providers, as the * case may be. * * Disclaimer of Warranty * * SOFTWARE IS WARRANTED, IF AT ALL, IN ACCORDANCE WITH THESE TERMS OF THE * LICENSE AGREEMENT. UNLESS OTHERWISE EXPLICITLY STATED, THIS SOFTWARE IS * PROVIDED "AS IS", IS EXPERIMENTAL, AND IS FOR NON-COMMERCIAL USE ONLY, * AND ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO THE EXTENT THAT * SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. * * Limitation of Liability * * SwRI SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED AS A RESULT OF USING, * MODIFYING, CONTRIBUTING, COPYING, DISTRIBUTING, OR DOWNLOADING THIS * SOFTWARE. IN NO EVENT SHALL SwRI BE LIABLE FOR ANY INDIRECT, PUNITIVE, * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGE (INCLUDING LOSS OF BUSINESS, * REVENUE, PROFITS, USE, DATA OR OTHER ECONOMIC ADVANTAGE) HOWEVER IT ARISES, * WHETHER FOR BREACH OF IN TORT, EVEN IF SwRI HAS BEEN PREVIOUSLY ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. YOU HAVE SOLE RESPONSIBILITY FOR ADEQUATE * PROTECTION AND BACKUP OF DATA AND/OR EQUIPMENT USED IN CONNECTION WITH THE * SOFTWARE AND WILL NOT MAKE A CLAIM AGAINST SwRI FOR LOST DATA, RE-RUN TIME, * INACCURATE OUTPUT, WORK DELAYS OR LOST PROFITS RESULTING FROM THE USE OF * THIS SOFTWARE. YOU AGREE TO HOLD SwRI HARMLESS FROM, AND YOU COVENANT NOT * TO SUE SwRI FOR, ANY CLAIMS BASED ON USING THE SOFTWARE. * * Local Laws: Export Control * * You acknowledge and agree this Software is subject to the U.S. Export * Administration Laws and Regulations. Diversion of such Software contrary * to U.S. law is prohibited. You agree that none of the Software, nor any * direct product therefrom, is being or will be acquired for, shipped, * transferred, or reexported, directly or indirectly, to proscribed or * embargoed countries or their nationals, nor be used for nuclear activities, * chemical biological weapons, or missile projects unless authorized by U.S. * Government. Proscribed countries are set forth in the U.S. Export * Administration Regulations. Countries subject to U.S embargo are: Cuba, * Iran, Iraq, Libya, North Korea, Syria, and the Sudan. This list is subject * to change without further notice from SwRI, and you must comply with the * list as it exists in fact. You certify that you are not on the U.S. * Department of Commerce's Denied Persons List or affiliated lists or on the * U.S. Department of Treasury's Specially Designated Nationals List. You agree * to comply strictly with all U.S. export laws and assume sole responsibilities * for obtaining licenses to export or reexport as may be required. * * General * * These Terms represent the entire understanding relating to the use of the * Software and prevail over any prior or contemporaneous, conflicting or * additional, communications. SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "$URL: svn://elmer/devel/SVN/SDDAS/trunk/libbase_idfs/adjust_time.c $ %D% SwRI" #include "libbase_idfs.h" /****************************************************************************** * * * ADJUST_TIME SUBROUTINE * * * * DESCRIPTION * * This module adjusts the time components when a day boundary has been * * crossed. It adjusts if either previous day has been crossed or next day * * has been crossed. Year boundaries and leap years are taken into account. * * * * INPUT VARIABLES * * SDDAS_SHORT *year Year component of time to adjust * * SDDAS_SHORT *day Julian day (DOY) component of time to adjust * * SDDAS_LONG *time Time of day * * SDDAS_CHAR time_unit flag indicating unit for time of day - * * 1 = seconds * * 2 = milliseconds * * * * OUTPUT VARIABLES * * SDDAS_SHORT *year Adjusted year component of time * * SDDAS_SHORT *day Adjusted Julian day (DOY) component of time * * SDDAS_LONG *time Adjusted time of day component of time * * * * USAGE * * adjust_time (&year, &day, &time, time_unit); * * * * NECESSARY SUBPROGRAMS * * ir_adjust_year_day () adjust the dayofyear and year values * * * * EXTERNAL VARIABLES * * None * * * * INTERNAL VARIABLES * * SDDAS_LONG comp_value maximum value for time unit * * SDDAS_CHAR decrement_day increment/decrement flag: * * 0 = increment by one * * 1 = decrement by one * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ void adjust_time (SDDAS_SHORT *year, SDDAS_SHORT *day, SDDAS_LONG *time, SDDAS_CHAR time_unit) { SDDAS_LONG comp_value; SDDAS_CHAR decrement_day; /*******************************************************/ /* Adjust time components if previous day is crossed */ /*******************************************************/ comp_value = (time_unit == 1) ? 86400 : 86400000; while (*time < 0) { *time += comp_value; decrement_day = 1; ir_adjust_year_day (year, day, decrement_day); } /***************************************************/ /* Adjust time components if next day is crossed */ /***************************************************/ while (*time >= comp_value) { *time -= comp_value; decrement_day = 0; ir_adjust_year_day (year, day, decrement_day); } }