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integer function slstr (from, to, first, chars)
integer from (100), to (100)
integer first, chars
integer len, i, j, k
integer length
len = length (from)
i = first
if (.not.(i .lt. 1))goto 23000
i = i + len + 1
23000 continue
if (.not.(chars .lt. 0))goto 23002
i = i + chars + 1
chars = - chars
23002 continue
j = i + chars - 1
if (.not.(i .lt. 1))goto 23004
i = 1
23004 continue
if (.not.(j .gt. len))goto 23006
j = len
23006 continue
k = 0
23008 if (.not.(i .le. j))goto 23010
to (k + 1) = from (i)
i = i + 1
23009 k = k + 1
goto 23008
23010 continue
to (k + 1) = -2
slstr=(k)
return
end
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