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BSD 4.3

#
#          W O R D   I N T E R S E C T I O N S
#

#  This program procedure accepts string pairs from standard input, with
#  the strings separated by semicolons.  It then diagrams all the
#  intersections of the two strings in a common character.

procedure main()
   local line, j
   while line := read() do {
      write()
      j := upto(':',line)
      cross(line[1:j],line[j+1:0])
      }
end

procedure cross(s1,s2)
   local j, k
   every j := upto(s2,s1) do
      every k := upto(s1[j],s2) do
         xprint(s1,s2,j,k)
end

procedure xprint(s1,s2,j,k)
   write()
   every write(right(s2[1 to k-1],j))
   write(s1)
   every write(right(s2[k+1 to *s2],j))
end

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