[BusyBox] BusyBox SED bugs reproducible at will.

[Serge Caron]

1) The construct [[:space:]]* is broken and sed will enter an infinite loop
if this construct is used in a substitute command with the g modifier.

   to reproduce:

  echo "12345" | sed -e "s/[[:space:]]/,/"
  12345 (as expected)

  echo "12345" | sed -e "s/[[:space:]]*/,/"
  ,12345 (BUG!!!)

  echo "12345" | sed -e "s/[[:space:]]*/,/g"
  (Infinite loop :()

2) Processing the input line mutiple times yield unexpected results:
    (in this example, suppose you want to remove comments and whitespace for
a file in /etc)

    sed -e "s/#.*$//" -e "/^[[:space:]]*$/d" /etc/inittab > junk

    all comments are deleted and only empty lines not originaly containing
comments are deleted.

3) BusyBox sed adds a newline at the end of the input stream

     echo -n "12345" | sed -e "s/3/c/" >> junk
     echo -n "12345" | sed -e "s/3/c/" >> junk
     cat junk
   12c45
   12c45

Regards

Serge Caron