#	STRUTIL
#
#	Miscellaneous string utilities
#
#	Ralph E. Griswold
#
#	Last modified 12/15/85
#

#  compress characters
#
procedure compress(s,c)
   local i
   i := 0
   while i := upto(c,s,i + 1) do
      s := s[1:i + 1] || s[many(s[i],s,i):0]
   return s
end

#  delete characters
#
procedure delete(s,c)
   local i
   while i := upto(c,s) do
      s[i:many(c,s,i)] := ""
   return s
end

#  rotate string
#
procedure rotate(s,i)
  /i := 1
   if i <= 0 then i +:= *s
   i %:= *s
   return s[i + 1:0] || s[1:i + 1]
end