gpkgmapvfp
(void) gpkgmapvfp(ept, (VFP_T *)NULL); /* This just clears stuff. */
n = gpkgmapvfp(&map_entry, vfp);
n = gpkgmapvfp(&map_entry, vfp);
gpkgmapvfp((P), (VFP)))
#define NXTENTRY(P, VFP) (gpkgmapvfp((P), (VFP)))
while ((n = gpkgmapvfp(&entry, vfp)) > 0) {
extern int gpkgmapvfp(struct cfent *ept, VFP_T *fpv);