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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 "@(#) $Id: frac_stime.c 20511 2009-09-28 15:00:43Z carrie $ SwRI" #include "libbase_idfs.h" #include "frac_defs.h" /******************************************************************************* * * * IR_FRAC_START_TIME SUBROUTINE * * * * DESCRIPTION * * This routine is called to determine if the current sample starts before, * * at the same time, or after the start time of the delta-t being processed. * * This information is pertinent to the calculation of the percentage of the * * data value that is to be included in the current delta-t processing. * * * * INPUT VARIABLES * * struct time_span structure that holds the time period for * * src_time the current delta-t being processed * * SDDAS_SHORT byear year value for the start time of the sample * * SDDAS_SHORT bday day value for the start time of the sample * * SDDAS_LONG bmilli time of day value for the start time of the * * sample * * SDDAS_LONG bnano time of day residual for thestartend time * * for the sample * * * * USAGE * * x = ir_frac_start_time (src_time, byear, bday, bmilli, bnano) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * None * * * * INTERNAL VARIABLES * * SDDAS_CHAR use_top value returned to calling module * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ SDDAS_CHAR ir_frac_start_time (struct time_span src_time, SDDAS_SHORT byear, SDDAS_SHORT bday, SDDAS_LONG bmilli, SDDAS_LONG bnano) { SDDAS_CHAR use_top; /***************************************************************************/ /* Check to see if the sample time is prior to the delta-t start time, */ /* equal to the delta-t start time or after the delta-t start time so */ /* the fraction can be calculated with respect to the top edge (start */ /* time) or bottom edge (end time) of the delta-t time period. */ /* Use this order of IF ELSE_IF for year and day to try to cut down on */ /* the number of tests. */ /***************************************************************************/ if (byear == src_time.byear) { if (bday == src_time.bday) { if (bmilli > src_time.bmilli) use_top = FRAC_AFTER_START; else if (bmilli < src_time.bmilli) use_top = FRAC_BEFORE_START; else { if (bnano > src_time.bnano) use_top = FRAC_AFTER_START; else if (bnano == src_time.bnano) use_top = FRAC_EQUAL_START; else use_top = FRAC_BEFORE_START; } } else if (bday > src_time.bday) use_top = FRAC_AFTER_START; else use_top = FRAC_BEFORE_START; } else if (byear > src_time.byear) use_top = FRAC_AFTER_START; else use_top = FRAC_BEFORE_START; return (use_top); }