WSJT-X/getpfx1.f

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subroutine getpfx1(callsign,k)
character callsign*12
character*8 c
character addpfx*8
C Can't 'include' *.f90 in *.f
common/gcom4/addpfx
include 'pfx.f'
iz=index(callsign,' ') - 1
if(iz.lt.0) iz=12
islash=index(callsign(1:iz),'/')
k=0
c=' '
if(islash.gt.0 .and. islash.le.(iz-4)) then
! Add-on prefix
c=callsign(1:islash-1)
callsign=callsign(islash+1:iz)
do i=1,NZ
if(pfx(i)(1:4).eq.c) then
k=i
go to 10
endif
enddo
if(addpfx.eq.c) then
k=449
go to 10
endif
else if(islash.eq.(iz-1)) then
! Add-on suffix
c=callsign(islash+1:iz)
callsign=callsign(1:islash-1)
do i=1,NZ2
if(sfx(i).eq.c(1:1)) then
k=400+i
go to 10
endif
enddo
endif
10 if(islash.ne.0 .and.k.eq.0) k=-1
return
end