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/* this is a simple little package to manage the saving and retrieving of
* field values, which we call field logging or "flogs". a flog consists of a
* field location, ala rcfpack(), its value as a double and its value as
* a string (ie, however it was printed). you can reset the list of flogs, add
* to and remove from the list of registered fields and log a field if it has
* been registered.
*
* this is used by the plotting and searching facilities of ephem to maintain
* the values of the fields that are being plotted or used in search
* expressions. it is used by the listing facility to generate listing files.
*
* a field can be in use for more than one
* thing at a time (eg, all the X plot values may the same time field, or
* searching and plotting might be on at one time using the same field) so
* we consider the field to be in use as long a usage count is > 0.
*/
#include "screen.h"
extern char *strcpy(), *strncpy();
#define NFLOGS 32 /* max number of distinct simultaneous logged
* fields
*/
typedef struct {
int fl_usagecnt; /* number of "users" logging to this field */
int fl_fld; /* an rcfpack(r,c,0) */
double fl_val; /* stored value as a double */
char fl_str[16]; /* stored value as a formatted string.
* N.B.: never overwrite last char: keep as \0
*/
} FLog;
static FLog flog[NFLOGS];
/* add fld to the list. if already there, just increment usage count.
* return 0 if ok, else -1 if no more room.
*/
flog_add (fld)
int fld;
{
FLog *flp, *unusedflp = 0;
/* scan for fld already in list, or find an unused one along the way */
for (flp = &flog[NFLOGS]; --flp >= flog; ) {
if (flp->fl_usagecnt > 0) {
if (flp->fl_fld == fld) {
flp->fl_usagecnt++;
return (0);
}
} else
unusedflp = flp;
}
if (unusedflp) {
unusedflp->fl_fld = fld;
unusedflp->fl_usagecnt = 1;
return (0);
}
return (-1);
}
/* decrement usage count for flog for fld. if goes to 0 take it out of list.
* ok if not in list i guess...
*/
flog_delete (fld)
int fld;
{
FLog *flp;
for (flp = &flog[NFLOGS]; --flp >= flog; )
if (flp->fl_fld == fld && flp->fl_usagecnt > 0) {
if (--flp->fl_usagecnt <= 0) {
flp->fl_usagecnt = 0;
}
break;
}
}
/* if plotting, listing or searching is active then
* if rcfpack(r,c,0) is in the fld list, set its value to val.
* return 0 if ok, else -1 if not in list.
*/
flog_log (r, c, val, str)
int r, c;
double val;
char *str;
{
if (plot_ison() || listing_ison() || srch_ison()) {
FLog *flp;
int fld = rcfpack (r, c, 0);
for (flp = &flog[NFLOGS]; --flp >= flog; )
if (flp->fl_fld == fld && flp->fl_usagecnt > 0) {
flp->fl_val = val;
(void) strncpy (flp->fl_str, str, sizeof(flp->fl_str)-1);
return(0);
}
return (-1);
} else
return (0);
}
/* search for fld in list. if find it, return its value and str, if str.
* return 0 if found it, else -1 if not in list.
*/
flog_get (fld, vp, str)
int fld;
double *vp;
char *str;
{
FLog *flp;
for (flp = &flog[NFLOGS]; --flp >= flog; )
if (flp->fl_fld == fld && flp->fl_usagecnt > 0) {
*vp = flp->fl_val;
if (str)
(void) strcpy (str, flp->fl_str);
return (0);
}
return (-1);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.