scripts: move to buildtools

[dpdk.git] / buildtools / relpath.sh

diff --git a/buildtools/relpath.sh b/buildtools/relpath.sh
new file mode 100755 (executable)
index 0000000..4ff4671
--- /dev/null
+++ b/buildtools/relpath.sh
@@ -0,0 +1,105 @@
+#!/bin/sh
+
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#
+# print the relative path of $1 from $2 directory
+# $1 and $2 MUST be absolute paths
+#
+
+if [ $# -ne 2 ]; then
+       echo "Bad arguments"
+       echo "Usage:"
+       echo "  $0 path1 path2"
+       exit 1
+fi
+
+# get the real absolute path, derefencing symlinks
+ABS1=$(readlink -f $1)
+ABS2=$(readlink -f $2)
+
+# remove leading slash
+REL1=${ABS1#/}
+REL2=${ABS2#/}
+
+left1=${REL1%%/*}
+right1=${REL1#*/}
+prev_right1=$REL1
+prev_left1=
+
+left2=${REL2%%/*}
+right2=${REL2#*/}
+prev_right2=$REL2
+prev_left2=
+
+prefix=
+
+while [ "${right1}" != "" -a "${right2}" != "" ]; do
+
+       if [ "$left1" != "$left2" ]; then
+               break
+       fi
+
+       prev_left1=$left1
+       left1=$left1/${right1%%/*}
+       prev_right1=$right1
+       right1=${prev_right1#*/}
+       if [ "$right1" = "$prev_right1" ]; then
+               right1=""
+       fi
+
+       prev_left2=$left2
+       left2=$left2/${right2%%/*}
+       prev_right2=$right2
+       right2=${prev_right2#*/}
+       if [ "$right2" = "$prev_right2" ]; then
+               right2=""
+       fi
+done
+
+if [ "${left1}" != "${left2}" ]; then
+       right2=${prev_right2}
+       right1=${prev_right1}
+fi
+
+while [ "${right2}" != "" ]; do
+       prefix=${prefix}../
+       prev_right2=$right2
+       right2=${right2#*/}
+       if [ "$right2" = "$prev_right2" ]; then
+               right2=""
+       fi
+done
+
+echo ${prefix}${right1}
+
+exit 0