1 files changed, 77 insertions, 0 deletions
diff --git a/funtools/funtest/evmerge.c b/funtools/funtest/evmerge.c
new file mode 100644
index 0000000..6b7cebc
--- /dev/null
+++ b/funtools/funtest/evmerge.c
@@ -0,0 +1,77 @@
+/*
+ *
+ * evmerge.c -- example program for merging user values into a table file
+ *
+ */
+#include <funtools.h>
+#include <word.h>
+
+#define MAXROW 8192
+
+typedef struct evstruct{
+  double time;
+  int time2;
+} *Ev, EvRec;
+
+int main (int argc, char **argv)
+{
+  int i, got;
+  char tbuf[SZ_LINE];
+  Fun fun, fun2;
+  Ev ebuf, ev;
+
+  /* exit on gio errors */
+  setgerror(2);
+
+  /* make sure we have minimal arguments */
+  if( argc < 4 )
+    gerror(stderr, "usage: %s iname oname mergetype [columns]\n", argv[0]);
+
+  /* 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]);
+
+  /* "merge=[type]" merges original input columns with new ones, where type is:
+   * update -- add new columns, update value of existing ones (same data type)
+   * replace -- add new columns, replace data type and value of existing ones
+   * append -- only add new columns, do not "replace" or "update" existing ones
+   * If tbuf argument is NULL, no merging is performed -- only user-specified
+   * columns are output.
+   */
+  if( isfalse(argv[3]) )
+    *tbuf = '\0';
+  else
+    sprintf(tbuf, "merge=%s", argv[3]);
+  FunColumnSelect(fun, sizeof(EvRec), tbuf,
+		  "time",      "D", 	"rw",  FUN_OFFSET(Ev, time),
+		  "time2",     "J",     "w",   FUN_OFFSET(Ev, time2),
+		  NULL);
+
+  /* activate specified columns -- these will be written to the output file */
+  if( argc >= 5 )
+    FunColumnActivate(fun, argv[4], 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->time2 = (int)(ev->time+.5);
+      ev->time = -(ev->time/10.0);
+    }
+    /* write out this batch of rows with the new column */
+    FunTableRowPut(fun2, (char *)ebuf, got, 0, NULL);
+    /* free row data */
+    if( ebuf ) free(ebuf);
+  }
+
+  /* clean up -- close output before input to perform flush automatically */
+  FunClose(fun2);
+  FunClose(fun);
+  return(0);
+}