src/nws_portability/Forecast/last_value.c

   1 /* $Id$ */
   2
   3 #include <unistd.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <math.h>
   7 #include <string.h>
   8 #include <strings.h>
   9
  10 #include "fbuff.h"
  11 #include "last_value.h"
  12
  13 struct last_value_state
  14 {
  15         fbuff series;                   /* the series so far */
  16         fbuff time_stamps;              /* the time stamps */
  17         double value;
  18 };
  19
  20 /*
  21  * init local state.  can save a copy of the pointer to the
  22  * series and time stamps, if desired
  23  */
  24 char *
  25 InitLastValue(fbuff series, fbuff time_stamps, char *params)
  26 {
  27         struct last_value_state *state;
  28
  29         state = (struct last_value_state *)
  30                 malloc(sizeof(struct last_value_state));
  31
  32         if(state == NULL)
  33         {
  34                 return(NULL);
  35         }
  36
  37         /*
  38          * all functions take a forcb
  39          */
  40         state->series = series;
  41         state->time_stamps = time_stamps;
  42
  43         return((char *)state);
  44 }
  45
  46 void
  47 FreeLastValue(char *state)
  48 {
  49         free(state);
  50         return;
  51 }
  52
  53 void
  54 UpdateLastValue(char *state,
  55                 double ts,
  56                 double value)
  57 {
  58         /*
  59          * no op -- will just grab it from series
  60          */
  61         return;
  62 }
  63
  64 int
  65 ForcLastValue(char *state, double *v)
  66 {
  67         double val;
  68         struct last_value_state *s = (struct last_value_state *)state;
  69
  70         if(!IS_EMPTY(s->series))
  71         {
  72                 val = F_VAL(s->series,F_FIRST(s->series));
  73                 *v = val;
  74                 return(1);
  75         }
  76         else
  77         {
  78                 *v = 0.0;
  79                 return(0);
  80         }
  81 }
  82
  83