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Cleanup and commenting of q65_hist.f90.

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This commit is contained in:
Joe Taylor 2021-03-19 09:10:04 -04:00
parent f366248bb6
commit 8e9f43fc03
1 changed files with 21 additions and 14 deletions
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35
lib/qra/q65/q65.f90
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@ -703,15 +703,20 @@ end subroutine q65_snr
subroutine q65_hist(if0,msg0,dxcall,dxgrid)
! Save the MAXHIST most receent decodes, and their f0 values; or, if
! dxcall is present, look up the most recent dxcall and dxgrid at the
! specified f0.
parameter (MAXHIST=100)
integer,intent(in) :: if0
character(len=37),intent(in),optional :: msg0
character(len=12),intent(out),optional :: dxcall
character(len=6),intent(out),optional :: dxgrid
integer,intent(in) :: if0 !Audio freq of decode
character(len=37),intent(in),optional :: msg0 !Decoded message
character(len=12),intent(out),optional :: dxcall !Second callsign in message
character(len=6),intent(out),optional :: dxgrid !Third word in msg, if grid
character*6 g1
character*37 msg(MAXHIST)
integer nf0(MAXHIST)
logical isgrid
character*37 msg(MAXHIST) !Saved messages
integer nf0(MAXHIST) !Saved frequencies
logical isgrid !Statement function
data nhist/0/
save nhist,nf0,msg
@ -719,28 +724,30 @@ subroutine q65_hist(if0,msg0,dxcall,dxgrid)
g1(2:2).le.'R' .and. g1(3:3).ge.'0' .and. g1(3:3).le.'9' .and. &
g1(4:4).ge.'0' .and. g1(4:4).le.'9' .and. g1(1:4).ne.'RR73'
if(present(dxcall)) go to 100
if(present(dxcall)) go to 100 !This is a lookup request
if(nhist.eq.MAXHIST) then
nf0(1:MAXHIST-1)=nf0(2:MAXHIST)
nf0(1:MAXHIST-1)=nf0(2:MAXHIST) !List is full, must make room
msg(1:MAXHIST-1)=msg(2:MAXHIST)
nhist=MAXHIST-1
endif
nhist=nhist+1
nhist=nhist+1 !Insert msg0 at end of list
nf0(nhist)=if0
msg(nhist)=msg0
go to 900
100 dxcall=' '
100 dxcall=' ' !This is a lookup request
dxgrid=' '
do i=1,nhist
! Look for a decode close to if0, starting with most recent ones
do i=nhist,1,-1
if(abs(nf0(i)-if0).gt.10) cycle
i1=index(msg(i),' ')
if(i1.ge.4 .and. i1.le.13) then
i2=index(msg(i)(i1+1:),' ') + i1
dxcall=msg(i)(i1+1:i2-1)
dxcall=msg(i)(i1+1:i2-1) !Extract dxcall
g1=msg(i)(i2+1:i2+4)
if(isgrid(g1)) dxgrid=g1(1:4)
if(isgrid(g1)) dxgrid=g1(1:4) !Extract dxgrid
exit
endif
enddo