2017-07-20 15:15:00 +00:00
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subroutine chkcall(w,bc,cok)
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! Check "w" to see if it could be a valid standard callsign or a valid
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! compound callsign.
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! Return base call "bc" and a logical "cok" indicator.
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character w*13 !A putative callsign
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character bc*6 !Base call (tentative)
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character c*1
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logical cok,isdigit,isletter
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isdigit(c)=(ichar(c).ge.ichar('0')) .and. (ichar(c).le.ichar('9'))
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isletter(c)=(ichar(c).ge.ichar('A')) .and. (ichar(c).le.ichar('Z'))
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cok=.true.
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bc=w(1:6)
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n1=len_trim(w)
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if(n1.gt.11) go to 100
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if(index(w,'.').ge.1) go to 100
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if(index(w,'+').ge.1) go to 100
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if(index(w,'-').ge.1) go to 100
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if(index(w,'?').ge.1) go to 100
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if(n1.gt.6 .and. index(w,'/').le.0) go to 100
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i0=index(w,'/')
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if(max(i0-1,n1-i0).gt.6) go to 100 !Base call must be < 7 characters
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if(i0.ge.2 .and. i0.le.n1-1) then !Extract base call from compound call
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if(i0-1.le.n1-i0) bc=w(i0+1:n1)//' '
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if(i0-1.gt.n1-i0) bc=w(1:i0-1)//' '
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endif
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nbc=len_trim(bc)
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if(nbc.gt.6) go to 100 !Base call should have no more than 6 characters
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! One of first two characters (c1 or c2) must be a letter
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if((.not.isletter(bc(1:1))) .and. (.not.isletter(bc(2:2)))) go to 100
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2022-02-17 10:17:47 -05:00
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! Real calls don't start with Q, but we'll allow the placeholder
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! callsign QU1RK to be considered a standard call:
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if(bc(1:1).eq.'Q' .and. bc(1:5).ne.'QU1RK') go to 100
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2017-07-20 15:15:00 +00:00
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! Must have a digit in 2nd or 3rd position
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i1=0
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if(isdigit(bc(2:2))) i1=2
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if(isdigit(bc(3:3))) i1=3
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if(i1.eq.0) go to 100
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! Callsign must have a suffix of 1-3 letters
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if(i1.eq.nbc) go to 100
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n=0
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do i=i1+1,nbc
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j=ichar(bc(i:i))
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if(j.lt.ichar('A') .or. j.gt.ichar('Z')) go to 100
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n=n+1
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enddo
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if(n.ge.1 .and. n.le.3) go to 200
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100 cok=.false.
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200 return
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end subroutine chkcall
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