scripts/relpath.sh

   1 #!/bin/sh
   2
   3 #   BSD LICENSE
   4 #
   5 #   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
   6 #   All rights reserved.
   7 #
   8 #   Redistribution and use in source and binary forms, with or without
   9 #   modification, are permitted provided that the following conditions
  10 #   are met:
  11 #
  12 #     * Redistributions of source code must retain the above copyright
  13 #       notice, this list of conditions and the following disclaimer.
  14 #     * Redistributions in binary form must reproduce the above copyright
  15 #       notice, this list of conditions and the following disclaimer in
  16 #       the documentation and/or other materials provided with the
  17 #       distribution.
  18 #     * Neither the name of Intel Corporation nor the names of its
  19 #       contributors may be used to endorse or promote products derived
  20 #       from this software without specific prior written permission.
  21 #
  22 #   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23 #   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24 #   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25 #   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26 #   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27 #   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28 #   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29 #   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30 #   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31 #   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32 #   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 #
  34 #  version: DPDK.L.1.2.3-3
  35
  36 #
  37 # print the relative path of $1 from $2 directory
  38 # $1 and $2 MUST be absolute paths
  39 #
  40
  41 if [ $# -ne 2 ]; then
  42         echo "Bad arguments"
  43         echo "Usage:"
  44         echo "  $0 path1 path2"
  45         exit 1
  46 fi
  47
  48 REL1=${1#/}
  49 REL2=${2#/}
  50
  51 left1=${REL1%%/*}
  52 right1=${REL1#*/}
  53 prev_right1=$REL1
  54 prev_left1=
  55
  56 left2=${REL2%%/*}
  57 right2=${REL2#*/}
  58 prev_right2=$REL2
  59 prev_left2=
  60
  61 while [ "${right1}" != "" -a "${right2}" != "" ]; do
  62
  63         if [ "$left1" != "$left2" ]; then
  64                 break
  65         fi
  66
  67         prev_left1=$left1
  68         left1=$left1/${right1%%/*}
  69         prev_right1=$right1
  70         right1=${prev_right1#*/}
  71         if [ "$right1" = "$prev_right1" ]; then
  72                 right1=""
  73         fi
  74
  75         prev_left2=$left2
  76         left2=$left2/${right2%%/*}
  77         prev_right2=$right2
  78         right2=${prev_right2#*/}
  79         if [ "$right2" = "$prev_right2" ]; then
  80                 right2=""
  81         fi
  82 done
  83
  84 if [ "${left1}" != "${left2}" ]; then
  85         right2=${prev_right2}
  86         right1=${prev_right1}
  87 fi
  88
  89 while [ "${right2}" != "" ]; do
  90         prefix=${prefix}../
  91         prev_right2=$right2
  92         right2=${right2#*/}
  93         if [ "$right2" = "$prev_right2" ]; then
  94                 right2=""
  95         fi
  96 done
  97
  98 echo ${prefix}${right1}
  99
 100 exit 0