WSJT-X/lib/packgrid.f90

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subroutine packgrid(grid,ng,text)
parameter (NGBASE=180*180)
character*4 grid
character*1 c1
logical text
text=.false.
if(grid.eq.' ') go to 90 !Blank grid is OK
! First, handle signal reports in the original range, -01 to -30 dB
if(grid(1:1).eq.'-') then
read(grid(2:3),*,err=800,end=800) n
if(n.ge.1 .and. n.le.30) then
ng=NGBASE+1+n
go to 900
endif
go to 10
else if(grid(1:2).eq.'R-') then
read(grid(3:4),*,err=800,end=800) n
if(n.ge.1 .and. n.le.30) then
ng=NGBASE+31+n
go to 900
endif
go to 10
! Now check for RO, RRR, or 73 in the message field normally used for grid
else if(grid(1:4).eq.'RO ') then
ng=NGBASE+62
go to 900
else if(grid(1:4).eq.'RRR ') then
ng=NGBASE+63
go to 900
else if(grid(1:4).eq.'73 ') then
ng=NGBASE+64
go to 900
endif
! Now check for extended-range signal reports: -50 to -31, and 0 to +49.
10 n=99
c1=grid(1:1)
read(grid,*,err=20) n
go to 30
20 read(grid(2:4),*,err=30) n
30 if(n.ge.-50 .and. n.le.49) then
if(c1.eq.'R') then
write(grid,1002) n+50
1002 format('LA',i2.2)
else
write(grid,1003) n+50
1003 format('KA',i2.2)
endif
go to 40
endif
! Maybe it's free text ?
if(grid(1:1).lt.'A' .or. grid(1:1).gt.'R') text=.true.
if(grid(2:2).lt.'A' .or. grid(2:2).gt.'R') text=.true.
if(grid(3:3).lt.'0' .or. grid(3:3).gt.'9') text=.true.
if(grid(4:4).lt.'0' .or. grid(4:4).gt.'9') text=.true.
if(text) go to 900
! OK, we have a properly formatted grid locator
40 call grid2deg(grid//'mm',dlong,dlat)
long=dlong
lat=dlat+ 90.0
ng=((long+180)/2)*180 + lat
go to 900
90 ng=NGBASE + 1
go to 900
800 text=.true.
900 continue
return
end subroutine packgrid