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/*
*
* evmerge.c -- example program for merging user values into a table file
*
*/
#include <math.h>
#include <funtools.h>
#define MAXROW 8192
typedef struct evstruct{
double time;
double ntime;
double tinc;
} *Ev, EvRec;
int main (int argc, char **argv)
{
int i, got;
int maxrow=MAXROW;
double x=0.5;
char *tmode;
char *s;
Fun fun, fun2;
Ev ebuf, ev;
/* exit on gio errors */
setgerror(2);
/* make sure we have minimal arguments */
if( argc < 3 )
gerror(stderr, "usage: %s iname oname [columns]\n", argv[0]);
/* get maxrow,if user-specified */
if( (s=(char *)getenv("FUN_MAXROW")) != NULL )
maxrow = atoi(s);
/* open input file */
if( !(fun = FunOpen(argv[1], "rc", NULL)) )
gerror(stderr, "could not FunOpen input file: %s\n", argv[1]);
/* open the output FITS image, inheriting params from input */
if( !(fun2 = FunOpen(argv[2], "w", fun)) )
gerror(stderr, "could not FunOpen output file: %s\n", argv[2]);
/* if we have "time2", read it, else create it */
if( FunColumnLookup(fun, "tinc", 0, NULL, NULL, NULL, NULL, NULL, NULL) )
tmode = "rw";
else
tmode = "w";
FunColumnSelect(fun, sizeof(EvRec), "merge=replace",
"time", "D", "r", FUN_OFFSET(Ev, time),
"ntime", "D", "rw", FUN_OFFSET(Ev, ntime),
"tinc", "D", tmode, FUN_OFFSET(Ev, tinc),
NULL);
/* activate specified columns -- these will be written to the output file */
if( argc >= 4 )
FunColumnActivate(fun, argv[3], NULL);
/* get rows -- let routine allocate the row array */
while( (ebuf = (Ev)FunTableRowGet(fun, NULL, maxrow, NULL, &got)) ){
/* process all rows */
for(i=0; i<got; i++){
/* point to the i'th row */
ev = ebuf+i;
ev->tinc += (i*sqrt(cos(x)*cos(x) + sin(x)*sin(x)));
ev->ntime = ev->time + ev->tinc;
/* write out row with the new columns */
FunTableRowPut(fun2, (char *)ev, 1, i, NULL);
}
/* free row data */
if( ebuf ) free(ebuf);
}
/* clean up -- close output before input to perform flush automatically */
FunClose(fun2);
FunClose(fun);
return(0);
}
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