#!/bin/sh
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#
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# File functions utilized as part of abspath.sh, realpath.sh, etc.
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#
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# Copyright (C) 2010, Cisco Systems Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# Ngie Cooper, January 2010
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#
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# POSIX compliant bourne shell functions for performing make 3.81
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# compliancy in 3.80 with a minimal set of external commands
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# [awk(1) // readlink(1) only required].
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#
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# 0. Strip all heading and leading space.
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# Paths:
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# 1. Empty string - print out $PWD.
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# 2. Not empty string...
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# i. Prefix all relative paths with $PWD.
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# ii. Replace /+ with /.
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# iii. Replace a/b/../c with a/c
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# iv. Replace /./ with /
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# v. Replace trailing /. with /
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# vi. Replace heading ./ with /
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# vii. Replace /. with "".
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# testcases/kernel/controllers/libcontrollers/../../../..
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_abspath() {
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echo "$@" | awk -v PWD=$(pwd) '{
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sub(/^[[:space:]]+/, ""); sub(/[[:space:]]+$/, ""); # 1.
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if ($0 == "") {
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print PWD
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} else {
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if (!($0 ~ /^\//)) { # i.
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$0 = PWD "/" $0
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}
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while (gsub(/\/\//, "/")) { }; # ii.
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while (sub(/\/[^\/]+\/\.\.\/?/, "/")) { }; # iii.
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while (sub(/\/\.\//, "/")) { }; # iv.
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sub(/(\/\.)?\/$/, "");
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sub(/^\.\//, "/");
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sub(/\/\.$/, "");
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if ($0 == "") {
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print "/"
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} else {
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if ($0 == ".") {
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print PWD
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} else {
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print
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}
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}
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}
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}'
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}
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_realpath() {
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readlink -f "$@"
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}
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