WSJT-X/lib/77bit/hash10.f90

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subroutine hash10(n10,c13,isave)
parameter (NMAX=20)
character*13 c13,callsign(NMAX)
integer ihash(NMAX)
logical first
data first/.true./
save first,ihash,callsign
if(first) then
ihash=-1
callsign=' '
first=.false.
endif
if(isave.ge.0) then
do i=1,NMAX
if(ihash(i).eq.n10) go to 900 !This one is already in the list
enddo
ihash(NMAX:2:-1)=ihash(NMAX-1:1:-1)
callsign(NMAX:2:-1)=callsign(NMAX-1:1:-1)
ihash(1)=n10
callsign(1)=c13
else
do i=1,NMAX
if(ihash(i).eq.n10) then
c13=callsign(i)
go to 900
endif
enddo
endif
900 return
end subroutine hash10