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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: constant_background.c 22018 2012-12-05 18:59:24Z carrie $ SwRI" #include "libbase_idfs.h" #include "ret_codes.h" /**************************************************************************** * * * IR_CONSTANT_BACKGROUND SUBROUTINE * * * * DESCRIPTION * * This routine is called in order to return the background value for a * * given parent sensor. The same background value is returned for each * * element of the sweep in the parent data source. It was coded this way * * in anticipation of possible value per step instead of a single value * * for all steps. The time range for each sweep step is computed and * * returned. * * * * INPUT VARIABLES * * SDDAS_CHAR full_swp flag that indicates if 1 value is being * * requested or all values for the record (for * * a scalar parameter only) * * SDDAS_SHORT which_psensor sensor number from the parent source for * * which data is requested * * void *idf_data_ptr ptr to the memory location for the structure * * that holds returned data values (read_drec) * * * * USAGE * * x = ir_constant_background (full_swp, which_psensor, idf_data_ptr) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * struct general_info structure that holds information concerning * * ginfo the experiment that is being processed * * * * INTERNAL VARIABLES * * struct idf_data structure that holds all of the currently * * *EXP_DATA returned data values to be processed * * struct experiment_info a pointer to the structure that holds * * *ex specific experiment information * * struct ptr_rec *ptr a pointer to the structure which holds all * * pointers to the header and data for the * * experiment of interest * * struct background_info a pointer to the structure that holds back- * * *bkgd_ptr ground information * * SDDAS_FLOAT *ret_data pointer to the returned background values * * SDDAS_USHORT max_ele the number of elements in the sweep * * SDDAS_USHORT swp_step current step of the sweep being processed * * SDDAS_USHORT n_sample the number of samples returned for each sensor* * * * SUBSYSTEM * * Display Level * * * ***************************************************************************/ SDDAS_SHORT ir_constant_background (SDDAS_CHAR full_swp, SDDAS_SHORT which_psensor, void *idf_data_ptr) { extern struct general_info ginfo; struct idf_data *EXP_DATA; struct experiment_info *ex; struct ptr_rec *ptr; struct background_info *bkgd_ptr; SDDAS_FLOAT *ret_data; SDDAS_USHORT max_ele, swp_step, n_sample; /***********************************************************************/ /* Set a pointer to the structure which holds all pointers for header */ /* and data information for the experiment currently being processed. */ /***********************************************************************/ ex = ginfo.expt; ptr = ex->info_ptr; bkgd_ptr = ex->background; /****************************************************************************/ /* No need to make sure data structure is correct type or that the header */ /* format is correct since this module is indirectly called by read_drec() */ /* which checks for this issue. */ /* */ /* File_status will be set to an error code IF the background constants */ /* are not defined in the VIDF file. Instead of being a "hard error", */ /* it simply means no background values are returned. */ /****************************************************************************/ EXP_DATA = (struct idf_data *) idf_data_ptr; if (bkgd_ptr->file_status != ALL_OKAY) { EXP_DATA->num_background = 0; return (ALL_OKAY); } /************************************************************************/ /* For a full swp, max_ele is not just set to N_SAMPLE because the user */ /* could have asked for one at a time and then changed to a full swp to */ /* get the remainder of the elements. */ /************************************************************************/ n_sample = *ptr->hdr_fmt1_ptr->N_SAMPLE; max_ele = (ex->smp_id == 2 && !full_swp) ? 1 : n_sample - ptr->time_row; /************************************************************************/ /* Return each defined background value for each element of the sweep. */ /************************************************************************/ ret_data = EXP_DATA->background; for (swp_step = 0; swp_step < max_ele; ++swp_step, ++ret_data) *ret_data = *(bkgd_ptr->data_values + which_psensor); EXP_DATA->num_background = max_ele; return (ALL_OKAY); }